diff --git a/.claude/skills/xce-test-ha/SKILL.md b/.claude/skills/xce-test-ha/SKILL.md index ae3897c..8c243a6 100644 --- a/.claude/skills/xce-test-ha/SKILL.md +++ b/.claude/skills/xce-test-ha/SKILL.md @@ -266,6 +266,185 @@ invariant is asserted with an immediate `fail()` inside `run_array_chaos_retry_round()`, so a violation aborts the run before this line is ever reached. +### `--config-upgrade` mode: live configuration upgrade under chaotic failover (config-upgrade-snapshot task 8.6) + +Drives a real `OP_upgradeConfig` RPC (the new `upgradeconfig` `xce_test` +client command, backed by `xcecli_upgradeconfig` → +`xce_upgradeconfig_req_raw`) against the live primary, submitted in the +**background** and interleaved with a bounded chaotic kill/restart sequence +(`XCE_HA_CONFIGUPGRADE_KILLS` rounds, default 3) — relying on the client's own +transparent failover (`XCECLI_FAILOVER_CALL`) to survive a primary change +mid-call, exactly like `--array-chaos-retry` relies on it for a job-array +submit. See `run_config_upgrade_round()`'s header comment (`run-ha-soak.sh`) +for the full mechanism trace. + +Sequence: + +1. Joins a synthetic worker host (wire-level `join`, same pattern + `--factstream` uses — no real `xcecd` process) and admin-closes it via the + new `hostctrl -c` command, giving Req 6.4 a concrete admin bit to prove + survives the upgrade. +2. Submits an initial batch of jobs — committed state the upgrade must + preserve. +3. Builds a second, "upgrade-target" `cluster.bin` from a scratch copy of the + **whole** `src/configs/` tree (not just `queues.yaml` — `xceadmin config + build` needs the full directory) with one deliberate, observable change: + the `night` queue's description text. Deliberately an **update to an + existing queue**, not an added one — see `run_config_upgrade_round()`'s + own comment and `.wolf/buglog.json` bug-1469: a live (non-restart) config + upgrade has no working mechanism today to create a *new* runtime queue + object in a member's `c->qmgr` (`build_queues()`, queue.c, only ever runs + once at process boot); that is a genuine, deep gap in tasks 1-7's + materialization logic, confirmed live and flagged for their owners, but + out of this task's scope to fix. An update to an existing queue's + description exercises exactly what Req 4.1-4.3/6.1/6.4 ask this scenario + to prove without depending on that separate, unrelated mechanism. +4. Submits the upgrade in the background, then runs the chaotic kill/restart + sequence — restarting the previously-downed node WITHOUT waiting for full + reconvergence before the next kill (like `--chaotic`), so the upgrade + genuinely has a chance to interleave with an in-progress recovery, not just + complete cleanly before or after every kill. +5. After the cluster reconverges 3-of-3 and the background submission + confirms success (retried once against the settled cluster if it did not + report success while kills were still landing), hard-asserts (`fail()`, + not count-and-tolerate — a definite correctness claim, like + `--force-snapshot`): + - **materialized-state identity** across all 3 members — byte-diff + (`snapdiff`) of each member's latest on-disk checkpoint file; + - **active-configuration identity** — `configcompare` (task 8.4's tool, + its first live use here) across all 3 members' `conf/current`; + - the synthetic host's **admin-CLOSED status specifically survives**, + checked DIRECTLY per member (not merely inferred from the two identity + checks above) by rotating primary through all 3 nodes in turn + (`force_elect_node`) and asserting `workerlist` shows it CLOSED while + each one serves — proving a standby-turned-primary materializes the + admin bit correctly too, not just whichever node happened to be primary + when the upgrade committed. + +Single dedicated round, not a loop — like `--force-snapshot`/`--array-soak`. + +```bash +SKILL_DIR=.claude/skills/xce-test-ha +nix develop ./src --command bash "$SKILL_DIR/run-ha-soak.sh" --config-upgrade ~/tmp/xce-ha-configupgrade +# tune kill-round count / synthetic host name +XCE_HA_CONFIGUPGRADE_KILLS=5 XCE_HA_CONFIGUPGRADE_HOST=my-host \ + nix develop ./src --command bash "$SKILL_DIR/run-ha-soak.sh" --config-upgrade ~/tmp/xce-ha-configupgrade +``` + +Verdict line: + +``` +[xce-test-ha] PASS (config-upgrade): 3 jobs, zero materialized-state divergence, zero configuration divergence, host admin-status confirmed across all members +``` + +Like `--array-soak`/`--array-chaos-retry`, `result` is unconditionally +`PASS` here — every hard invariant is asserted with an immediate `fail()` +inside `run_config_upgrade_round()`, so a violation aborts the run before +this line is ever reached; there is no `verdict_emit`/bug-924 exclusion +tally for this mode. + +### `--config-upgrade-wal-trim` mode: marker-triggered WAL-segment trim under a genuinely mid-catch-up standby (config-upgrade-snapshot task 8.9) + +Repeats the mid-catch-up WAL-trim assertion from the unit-level fixture +(`test_marker_triggered_checkpoint_trim_preserves_standby_mid_catchup_segments`, +`test_upgrade_snapshot_apply.c`) against a **real 3-node cluster** under +chaotic timing, instead of hand-controlled LSNs — proving Requirement 7.4: +the marker-triggered checkpoint's forced WAL trim +(`persist_checkpoint_marker_triggered` → `trim_wal_segments` → +`repl_trim_lsn`, bug-1147's pre-existing retention-floor guard, unmodified +by this spec) never strands a genuinely mid-catch-up standby's still-needed +WAL segment. See `run_config_upgrade_wal_trim_round()`'s own header comment +(`run-ha-soak.sh`) for the full mechanism trace, including why the "chaotic" +element is sequenced *before* the critical window rather than concurrent +with it (a 3-node cluster has no majority left if 2 of 3 are ever +simultaneously non-participants, and TARGET must stay down for the *whole* +critical window to be genuinely mid-catch-up). + +Sequence: + +1. Deploys with a small `--wal-segment-bytes` (`4096`, same proven value + `--force-snapshot` already uses) so segments genuinely rotate at soak job + counts — the 64 MB production default never rotates within any bounded + test's job volume. Deliberately does **not** lower `--max-wal-records` + (unlike `--force-snapshot`): this scenario's whole point is the + **marker**-triggered checkpoint specifically, not a periodic + WAL-threshold one, so the periodic threshold is left at its default + (`10000`, effectively never fires at this job volume) to keep the causal + story unambiguous. +2. One self-contained chaotic flap of the current primary (kill → restart + *without* waiting for convergence, mirroring `--chaotic`'s own + overlapping-kill style) runs first, then the cluster is allowed to settle + to a clean, well-understood 3-of-3 baseline — genuine, unplanned + term/timing churn *before* the critical window, since a literal + concurrent second kill during TARGET's down window is structurally + impossible (see above). +3. Picks a non-primary `TARGET`. Primes ≥2 WAL segments on the primary if + fewer than 2 exist yet (so there is real material below TARGET's eventual + floor to trim — otherwise the round would prove nothing, per its own + "not a single trivially-active segment" warning). +4. Captures the primary's **currently-active segment** as `TARGET`'s floor + (`seg_at_kill`) — valid because the cluster just fully reconverged, so + TARGET cannot need anything the primary hasn't written yet, and being + caught up it cannot be behind an earlier segment either. This is the live, + on-disk analog of the unit fixture's `repl_on_ack(lsn2)` call, except here + it is TARGET's real replication state, not a simulated ack. +5. Kills `TARGET` — mid-catch-up from this instant: it has acked everything + through `seg_at_kill`'s coverage and nothing past it, exactly "has not yet + acknowledged the marker's position" (Req 7.4), since the marker has not + even been built yet. +6. While `TARGET` stays down, forces ≥2 **more** segment rotations past + `seg_at_kill` on the surviving 2-of-3 majority — a genuine multi-segment + below-floor/at-floor boundary, not a trivial single-segment case. +7. Builds an upgrade-target `cluster.bin` (same scratch-copy + one-field + "night queue" description edit as `--config-upgrade`, for the same + bug-1469 reason — an update to an existing queue, never an added one) and + submits it via `upgradeconfig` against the surviving majority. Its + committed `WAL_CONFIG_MARKER` apply on the primary is what fires + `persist_checkpoint_marker_triggered` → `trim_wal_segments`. +8. **Before restarting `TARGET`**, inspects the primary's real on-disk + `data/wal/` directory directly and hard-asserts: every below-floor + segment captured at baseline is now **gone**; the floor segment + (`seg_at_kill`) is **preserved**; the active segment is **preserved** — + the live analog of the unit fixture's seg-1 (gone) / seg-2 (preserved) / + seg-3 (preserved) assertions. Fails loud with the exact segment filenames + if the boundary isn't genuinely observed (mirrors `--force-snapshot`'s + "prove it, don't assume it" discipline — a false PASS here would prove + nothing). +9. Only *then* restarts `TARGET` and asserts full reconvergence + zero job + loss — the behavioral capstone proving the preserved segment was + genuinely *sufficient* for real incremental catch-up, not merely + present-but-unused. + +A wall-clock note baked into the round's own comments: bug-1147's +disconnected-standby guard (`repl.c`'s `last_disconnected_lsn` / +`last_disconnect_time`) expires after `snap_interval_s` (default 60s, not +exposed via any CLI flag). The round logs kill-to-inspection elapsed time and +warns if it is close to that budget — a failure under a slow environment may +reflect a genuinely-expired guard (correct behavior) rather than a +regression, so investigate environment slowness first if this round is +flaky. + +Single dedicated round, not a loop — like `--config-upgrade`/`--force-snapshot`. + +```bash +SKILL_DIR=.claude/skills/xce-test-ha +nix develop ./src --command bash "$SKILL_DIR/run-ha-soak.sh" --config-upgrade-wal-trim ~/tmp/xce-ha-waltrim +# tune rotation volume / batch size / attempt budget +XCE_HA_WALTRIM_ROTATIONS=3 XCE_HA_WALTRIM_BATCH=25 \ + nix develop ./src --command bash "$SKILL_DIR/run-ha-soak.sh" --config-upgrade-wal-trim ~/tmp/xce-ha-waltrim +``` + +Verdict line: + +``` +[xce-test-ha] PASS (config-upgrade-wal-trim): 33 jobs, below-floor WAL segment(s) trimmed, floor + active segments preserved, zero job loss after real incremental catch-up +``` + +Like `--config-upgrade`, `result` is unconditionally `PASS` here — every hard +invariant is asserted with an immediate `fail()` inside +`run_config_upgrade_wal_trim_round()`, so a violation aborts the run before +this line is ever reached. + ### Verdict self-test (no cluster) The verdict parser has a deterministic, pure-bash self-test that feeds fixture @@ -361,7 +540,7 @@ XCE_HA_ROUNDS=10 XCE_HA_TOP=/tmp/my-ha-run nix develop ./src --command bash "$SK | Env var | Meaning | Default | |---|---|---| | `XCE_HA_TOP` | deploy directory | `/home/claude/tmp/xce-ha-deploy` | -| `XCE_HA_MODE` | `sequential`, `chaotic`, `force-snapshot`, `factstream`, `array-soak`, or `array-chaos-retry` (its `--flag` wins) | `sequential` | +| `XCE_HA_MODE` | `sequential`, `chaotic`, `force-snapshot`, `factstream`, `array-soak`, `array-chaos-retry`, `config-upgrade`, or `config-upgrade-wal-trim` (its `--flag` wins) | `sequential` | | `XCE_HA_BIN` | `xce_controller` binary (point at real-fs release for the gate) | `/src/xce.build/controller/xce_controller` | | `XCE_HA_XT` | `xce_test` binary | `/src/xce.build/controller/xce_test` | | `XCE_HA_ROUNDS` | kill/restart rounds (5–50) | `6` | @@ -381,6 +560,11 @@ XCE_HA_ROUNDS=10 XCE_HA_TOP=/tmp/my-ha-run nix develop ./src --command bash "$SK | `XCE_HA_ARRAYRETRY_ROUNDS` | `--array-chaos-retry` kill-during-submit rounds | `5` | | `XCE_HA_ARRAYRETRY_SIZE` | `--array-chaos-retry` element count of the array each round submits | `6` | | `XCE_HA_ARRAYRETRY_KILL_DELAY` | `--array-chaos-retry` seconds slept after backgrounding the submit before killing the primary | `0` | +| `XCE_HA_CONFIGUPGRADE_KILLS` | `--config-upgrade` kill/restart rounds interleaved with the upgrade submission | `3` | +| `XCE_HA_CONFIGUPGRADE_HOST` | `--config-upgrade` name of the synthetic worker host joined and admin-closed before the upgrade | `cfgupgrade-host` | +| `XCE_HA_WALTRIM_ROTATIONS` | `--config-upgrade-wal-trim` number of new WAL segments to force past a reference point (priming, and while TARGET is down) | `2` | +| `XCE_HA_WALTRIM_BATCH` | `--config-upgrade-wal-trim` jobs submitted per attempt while forcing segment rotation | `15` | +| `XCE_HA_WALTRIM_MAX_ATTEMPTS` | `--config-upgrade-wal-trim` max batches attempted before failing loud that `--wal-segment-bytes` didn't produce the expected rotation | `20` | ## What the driver does (maps to the requested steps) diff --git a/.claude/skills/xce-test-ha/run-ha-soak.sh b/.claude/skills/xce-test-ha/run-ha-soak.sh index 6199258..fc5d768 100755 --- a/.claude/skills/xce-test-ha/run-ha-soak.sh +++ b/.claude/skills/xce-test-ha/run-ha-soak.sh @@ -32,6 +32,59 @@ # own log that a snapshot install actually happened (not # just a claim), then asserts zero walcompare divergence # and zero job loss. Single dedicated round, not a loop. +# --config-upgrade config-upgrade-snapshot task 8.6 (Req 4.1, 4.3, 6.1, +# 6.4): admin-closes a synthetic worker host, then submits a +# live configuration upgrade (OP_upgradeConfig, via the new +# `upgradeconfig` xce_test command) CONCURRENTLY with a +# bounded chaotic kill/restart sequence (XCE_HA_CONFIGUPGRADE_ +# KILLS rounds), relying on the client's own transparent +# failover (XCECLI_FAILOVER_CALL) to survive a primary +# change mid-call. After the cluster reconverges, hard- +# asserts (fail(), not count-and-tolerate — like +# --force-snapshot, this is a definite correctness claim): +# (1) materialized-state identity across all 3 members via +# byte-diff of each member's latest on-disk checkpoint file +# (snapdiff); (2) active-configuration identity via +# configcompare (task 8.4's tool, its first live use); (3) +# the admin-closed host's status specifically survives, +# checked DIRECTLY per member (not inferred from (1)/(2)) +# by rotating primary through all 3 nodes and querying +# workerlist against each. Single dedicated round, not a +# loop. +# --config-upgrade-wal-trim config-upgrade-snapshot task 8.9 (Req 7.4): +# repeats the mid-catch-up WAL-trim assertion from the unit +# fixture (test_marker_triggered_checkpoint_trim_preserves_ +# standby_mid_catchup_segments, test_upgrade_snapshot_apply.c) +# against a REAL 3-node cluster under chaotic timing, instead +# of hand-controlled LSNs. Deploys with a small +# --wal-segment-bytes (like --force-snapshot) so segments +# genuinely rotate; kills a non-primary TARGET while it is +# still caught up (its floor = the primary's currently-active +# segment at that instant); forces >=2 MORE segment rotations +# on the surviving majority while TARGET stays down; submits +# a live configuration upgrade (reusing --config-upgrade's +# upgradeconfig primitive) so its marker-triggered checkpoint +# fires persist_checkpoint_marker_triggered -> trim_wal_ +# segments -> repl_trim_lsn (bug-1147's pre-existing +# retention-floor guard) while TARGET is genuinely mid-catch- +# up; then, BEFORE restarting TARGET, inspects the primary's +# real on-disk wal/ directory directly and hard-asserts the +# below-floor segment(s) are gone, the floor segment is +# preserved, and the active segment is preserved — the live +# analog of the unit fixture's seg-1/seg-2/seg-3 assertions. +# Only THEN restarts TARGET and asserts full reconvergence + +# zero job loss (proving the preserved segment was genuinely +# sufficient for real incremental catch-up, not merely +# present-but-unused). One self-contained chaotic flap of the +# primary runs BEFORE the critical mid-catch-up window (a +# literal concurrent second kill during TARGET's down window +# is impossible in a 3-node cluster — 2 simultaneous non- +# participants leaves no majority — see the round's own +# header comment). Every empirical assumption (segment +# rotation volume, guard-expiry timing) is confirmed by +# direct evidence and fails loud, never assumed — mirroring +# --force-snapshot's "prove it, don't assume it" discipline. +# Single dedicated round, not a loop. # --factstream raft-apply-decoupling task 7.2 (Req 10.2/10.4): drives a # continuous WORKER-FACT stream (jstart/jfinish/jfail — real # wire-protocol worker reports, distinct from job-submission @@ -154,6 +207,29 @@ # (default 0 — immediate, to maximize "chaotic" # uncertainty about whether the WAL append/ # commit happened before the kill) +# XCE_HA_CONFIGUPGRADE_KILLS kill/restart rounds interleaved with the +# config-upgrade submission (default 3, +# independent of the general --chaotic ROUNDS +# knob — this is a single dedicated round, not +# a soak loop) +# XCE_HA_CONFIGUPGRADE_HOST name of the synthetic worker host joined and +# admin-closed before the upgrade, used to prove +# Req 6.4 (default "cfgupgrade-host") +# XCE_HA_WALTRIM_ROTATIONS --config-upgrade-wal-trim: number of NEW WAL +# segments to force past a reference point, +# both while priming (before TARGET is picked) +# and while TARGET is down (default 2 — enough +# for a genuine multi-segment below-floor/at- +# floor boundary, not just one trivially-active +# segment) +# XCE_HA_WALTRIM_BATCH --config-upgrade-wal-trim: jobs submitted per +# attempt while forcing segment rotation +# (default 15) +# XCE_HA_WALTRIM_MAX_ATTEMPTS --config-upgrade-wal-trim: max batches +# attempted before failing loud that +# --wal-segment-bytes did not produce the +# expected rotation at this job volume +# (default 20) set -u # ── Mode / flag parsing (flags may precede the positional [ROUNDS] [DEPLOY_DIR]) ─ @@ -174,6 +250,8 @@ while [ $# -gt 0 ]; do --factstream) MODE="factstream" ;; --array-soak) MODE="array-soak" ;; --array-chaos-retry) MODE="array-chaos-retry" ;; + --config-upgrade) MODE="config-upgrade" ;; + --config-upgrade-wal-trim) MODE="config-upgrade-wal-trim" ;; --selftest) exec bash "$SELF_DIR/soak-verdict-selftest.sh" ;; *[!0-9]*|'') ARGS+=("$1") ;; # non-integer ⇒ deploy dir *) ROUNDS_CLI="$1" ;; # bare integer ⇒ rounds @@ -223,9 +301,21 @@ WAITMS="${XCE_HA_WAITMS:-30000}" # reach, so it defaults --max-wal-records to persist's enforced floor (100) # unless the caller already set MAX_WAL_RECORDS explicitly. Every other mode # leaves it unset (empty ⇒ start_node passes no override, unchanged behavior). +# +# config-upgrade-snapshot task 8.9 (--config-upgrade-wal-trim): needs the SAME +# small physical segment size as force-snapshot (the 64 MB production default +# never rotates at soak job counts — see WAL_SEGMENT_BYTES doc above) so +# segments genuinely rotate, but deliberately does NOT lower MAX_WAL_RECORDS: +# this scenario's whole point is to exercise the MARKER-triggered checkpoint's +# trim specifically (Req 7.4), not a periodic WAL-threshold one — leaving the +# threshold at its default (10000) keeps the only forced checkpoint in this +# round the marker-triggered one, so the causal story stays unambiguous. if [ "$MODE" = "force-snapshot" ]; then MAX_WAL_RECORDS="${MAX_WAL_RECORDS:-100}" WAL_SEGMENT_BYTES="${WAL_SEGMENT_BYTES:-4096}" +elif [ "$MODE" = "config-upgrade-wal-trim" ]; then + MAX_WAL_RECORDS="${MAX_WAL_RECORDS:-}" + WAL_SEGMENT_BYTES="${WAL_SEGMENT_BYTES:-4096}" else MAX_WAL_RECORDS="${MAX_WAL_RECORDS:-}" WAL_SEGMENT_BYTES="${WAL_SEGMENT_BYTES:-}" @@ -829,8 +919,44 @@ walcheck_count() { # the expect-job result via the verdict parser. Increments V_JOBLOSS on a REAL # loss (reachable primary, tracked job "not found") and V_BUG854 when the client # cannot locate the primary (discovery fault — EXCLUDED). Never hard-fails. +# +# Retries a LOSS classification up to 5 times (2s settle between attempts) before +# counting it, mirroring verify_no_loss's bug-1422 "whole check" retry — same +# rationale, sharpened by a real bug-1487 live-repro measurement specific to +# chaotic mode: unlike wait_for_new_primary (which only waits for the new +# primary to be SERVING at a higher term) and unlike the sequential loop's +# wait_for_full_convergence (which waits for 2 consecutive fully-converged +# probes before the NEXT kill), this function runs immediately once a new +# primary is detected, with no settle window of its own. +# +# A newly-elected primary cannot advance its OWN committed_lsn past entries +# inherited from a PRIOR term merely because it holds them durably (Raft +# Figure-8 safety, `ha_arm_own_term_gate` in ha.c: "the universal commit +# barrier still requires per-entry majority of a new-term entry"). It appends +# an own-term WAL_NOOP on promotion and only folds in the earlier, already- +# majority-committed prefix once THAT noop itself gets a fresh majority ack +# under the new term. In steady state this closes in well under 200ms (round +# 24 of this same run: safe_committed_lsn -> committed_lsn advance in 167ms). +# But chaotic mode deliberately restarts the PREVIOUS round's downed node +# without waiting for it to reconverge before landing the NEXT kill (the +# "overlapping" design) -- so if that still-catching-up node is the one whose +# ack the new leader needs for its own-term barrier, the window stretches to +# however long that node's WAL catch-up stream takes. Live-repro evidence +# (bug-1487, this exact run): round 25 killed ctrl-1 while ctrl-3 was still +# reconnecting from round 25's own overlapping restart; ctrl-2 was elected at +# 04:47:52.470 with safe_committed_lsn=99 "(from 2 granted voters)" while its +# OWN committed_lsn (last known as a standby) stayed at 100 -- excluding the 3 +# jobs (lsn 101-103) ctrl-1 had already majority-committed (self + ctrl-2's +# own ack) moments before dying. committed_lsn did not jump to 104 (folding in +# 101-103) until ctrl-3's catch-up stream let it ack the new leader's own-term +# noop at 04:47:58.702 -- 6.232s later. verify_classify's single, immediate +# expect-job query landed inside that window and counted a false LOSS for a +# job that was genuinely durable/majority-committed the whole time and was +# confirmed present on every later verify (rounds 26-30 and the final sweep). +# 5 attempts x 2s settle gives ~8s of margin above the measured 6.232s gap +# while staying bounded -- a job still missing after that is a REAL loss. verify_classify() { - local primary out cls want="${#ALL_JOBIDS[@]}" + local primary out cls want="${#ALL_JOBIDS[@]}" attempt [ "$want" -eq 0 ] && return 0 primary="$(discover_primary)" if [ -z "$primary" ]; then @@ -849,8 +975,15 @@ expect-job $jid" done script+=" quit" - out="$(printf '%s\n' "$script" | xtest)" - cls="$(printf '%s' "$out" | verdict_classify_verify 1)" + for attempt in 1 2 3 4 5; do + out="$(printf '%s\n' "$script" | xtest)" + cls="$(printf '%s' "$out" | verdict_classify_verify 1)" + [ "$cls" = "LOSS" ] || break + if [ "$attempt" -lt 5 ]; then + log "verify_classify attempt $attempt/5: reachable primary $primary reports a tracked job missing (likely post-election own-term commit-barrier lag while a peer is still catching up, bug-1487 class) — settling 2s and rechecking before counting a loss" + sleep 2 + fi + done case "$cls" in LOSS) V_JOBLOSS=$((V_JOBLOSS + 1)) @@ -1016,6 +1149,537 @@ run_force_snapshot_round() { walcheck_count "${#ALL_JOBIDS[@]}" } +# ── Config-upgrade primitives (config-upgrade-snapshot task 8.6) ──────────── + +# Locate the xceadmin binary — same search list deploy-ha.sh uses (meson +# build output under whichever profile built it, or a nix-installed prefix). +# Needed here because this mode builds a SECOND cluster.bin itself (the +# upgrade target), unlike every other mode which only ever consumes the one +# deploy-ha.sh already built into ctrl-1/conf during Step 2. +find_xceadmin() { + local candidate + for candidate in \ + "$REPO/src/xce.build/xceadmin/.venv/bin/xceadmin" \ + "$REPO/src/build.release/xceadmin/.venv/bin/xceadmin" \ + "$REPO/src/build.dbg/xceadmin/.venv/bin/xceadmin" \ + "$REPO/src/result/bin/xceadmin" \ + "$(command -v xceadmin 2>/dev/null || true)" + do + if [ -n "$candidate" ] && [ -x "$candidate" ]; then + echo "$candidate" + return 0 + fi + done + return 1 +} + +# Echo a member's latest (highest-LSN) on-disk checkpoint file +# ($TOP/controller//data/snap/snap-.capnp — persist.c's +# p->snap_path, "%s/data/snap" under the node's workdir/name), or fail with +# rc!=0 if none exists yet. Filenames are fixed-width %016 hex, so +# lexicographic sort == LSN-numeric sort. +latest_snapshot_file() { + local node="$1" f + f="$(ls -1 "$TOP/controller/$node/data/snap"/snap-*.capnp 2>/dev/null | sort | tail -1)" + [ -n "$f" ] || return 1 + echo "$f" +} + +# config-upgrade-snapshot task 8.6 (Req 4.1, 4.3, 6.1, 6.4): drive a live +# configuration upgrade (OP_upgradeConfig, the new client built in this same +# task — lib/request.c xce_upgradeconfig_req_raw / lib/xceapi.c +# xce_upgradeconfig / lib/client.c xcecli_upgradeconfig, testsuite/test.c +# cmd_upgradeconfig) while chaotically killing/restarting the primary, then +# hard-assert (fail(), not count-and-tolerate — mirroring +# run_force_snapshot_round's own convention: this is a definite correctness +# claim, not a racy/sometimes-expected outcome class): +# +# - materialized-state identity across all 3 members (Req 4.1) — via +# byte-diff (snapdiff) of each member's latest on-disk checkpoint file, +# the SAME tooling design.md's Requirements Traceability row 6.1 cites +# (snapdiff_paths, configcompare) — NOT live per-node joblist/workerlist +# RPCs, because this system's read model is primary-only: OPCode_get +# (which joblist/workerlist/reslist all use) is absent from +# ha_dispatch_gate's CTRL_STANDBY allow-list (ha.c), so a standby cannot +# answer it directly — confirmed by direct inspection, not assumed. +# - active-configuration identity across all 3 members (Req 4.2/4.3) — via +# configcompare (task 8.4's tool), its first live use. +# - a host's administratively-set status specifically survives (Req 6.4), +# checked DIRECTLY per member — not merely inferred from the aggregate +# identity checks above — by rotating primary through each of the 3 +# nodes in turn (force_elect_node, already used for this script's +# leadership-coverage step) and querying workerlist against whichever +# node is currently serving, asserting the host shows CLOSED each time. +# +# One dedicated round, not a loop — like run_force_snapshot_round. +run_config_upgrade_round() { + local kills="${XCE_HA_CONFIGUPGRADE_KILLS:-3}" + local host="${XCE_HA_CONFIGUPGRADE_HOST:-cfgupgrade-host}" + local xceadmin scratch_dir scratch_bin + + xceadmin="$(find_xceadmin)" \ + || fail "config-upgrade: xceadmin binary not found (run /xce-build all or /xce-build xceadmin)" + + # 1. Join + admin-close a synthetic worker host BEFORE the upgrade, so + # Req 6.4 has a concrete admin bit to prove survives. Wire-level + # synthetic worker join — the same pattern run_factstream_round + # already uses (`set myname ` + `worker` + `join`); no real + # xcecd process is ever started. do_hostcontrol_op (worker.c) requires + # the host to already exist in the live worker table (-ENOENT + # otherwise) — this join step exists precisely to satisfy that, since + # hosts.yaml config entries do NOT auto-populate workermgr (a worker_t + # is created only by a live join, requirements.md's own Boundary + # Context note). + log "config-upgrade: joining synthetic host $host" + local jout + jout="$(printf 'set masters %s\nset myname %s\nworker\njoin\nquit\n' "$MASTERS" "$host" | xtest)" + echo "$jout" | grep -q "host join ok" \ + || fail "config-upgrade: synthetic host $host failed to join: $jout" + + log "config-upgrade: admin-closing $host via hostctrl" + local hout + hout="$(printf 'set masters %s\nset myname soak\nclient\nwait-primary %s\nhostctrl -c -h %s\nquit\n' \ + "$MASTERS" "$WAITMS" "$host" | xtest)" + echo "$hout" | grep -q "Operation on host $host done" \ + || fail "config-upgrade: hostctrl -c on $host failed: $hout" + log "config-upgrade: $host admin-closed" + + # 2. Initial batch of jobs — committed state the upgrade must preserve. + submit_jobs "$NJOBS" || fail "config-upgrade: initial submit failed" + verify_no_loss || fail "config-upgrade: job loss before the upgrade started" + + # 3. Build the upgrade-target config: a scratch COPY of the whole + # src/configs/ tree (schema/ subdir included, exactly mirroring what + # deploy-ha.sh itself passes to `xceadmin config build`) with one + # deliberate, observable change — the "night" queue's description + # text — so the post-upgrade identity check is a real assertion, not + # a tautology. + # + # Deliberately an UPDATE to an EXISTING queue, not an ADDED queue + # (bug-1469 finding, .wolf/buglog.json): a live (non-restart) config + # upgrade has no working mechanism to create a NEW runtime queue_t + # object in any member's c->qmgr — build_queues() (queue.c), the only + # code that ever populates c->qmgr from parsed config, runs exactly + # once at process boot (xce_config_init) and is unconditional/blind- + # create, unsafe to re-invoke live. That is a genuine, deep, + # confirmed gap in tasks 1-7's materialization logic (requires new, + # carefully-designed production code plus a queue-removal-semantics + # design decision this task is not chartered to make) — reproduced + # live TWICE (before and after config-upgrade-snapshot task 6.2's own + # activation-ordering fix), fully root-caused, and flagged for + # tasks 1-7's owners, but explicitly OUT OF SCOPE for task 8.6 to fix. + # An UPDATE to an existing queue's description exercises exactly what + # Requirements 4.1-4.3/6.1/6.4 ask this task to prove (materialized + # job/host state + active-configuration identity across members, + # surviving chaotic failover) without depending on that separate, + # unrelated, unfixed mechanism — collect_queue_frames' QueueAdminState + # frame only ever carries name+admin-status (persist.c:1895), never + # description/priority/etc., so this change is invisible to the + # queue-entity section either way and is carried purely by the + # checkpoint's embedded raw-config-bytes section (task 2.3, + # read_active_config_bytes — always a fresh disk re-read, unaffected + # by the qmgr-sync gap) and by configcompare's config-file-hash + # comparison — both of which are exactly the "active configuration + # identical" mechanisms Requirement 4.2/4.3 actually asks about. + scratch_dir="$TOP/.cfgupgrade-src" + scratch_bin="$TOP/.cfgupgrade-src.bin" + rm -rf "$scratch_dir" "$scratch_bin" + cp -r "$REPO/src/configs" "$scratch_dir" + sed -i 's/description: "night queue"/description: "night queue (config-upgrade-snapshot task 8.6 soak marker)"/' \ + "$scratch_dir/queues.yaml" + grep -q "task 8.6 soak marker" "$scratch_dir/queues.yaml" \ + || fail "config-upgrade: sed did not find the expected 'night queue' description line to mark — src/configs/queues.yaml may have changed shape" + "$xceadmin" config build "$scratch_dir" -o "$scratch_bin" \ + || fail "config-upgrade: xceadmin config build failed for the upgrade-target config" + log "config-upgrade: built upgrade-target cluster.bin with an updated 'night' queue description: $scratch_bin" + + # 4. Submit the upgrade CONCURRENTLY with a bounded kill/restart + # sequence — at least one kill/restart genuinely overlaps the upgrade + # RPC. xcecli_upgradeconfig's XCECLI_FAILOVER_CALL wrapper (Part A) is + # relied on to survive a primary change mid-call; xtest's own 60s + # timeout bounds the background job regardless. + local upgrade_log="$TOP/logs/config-upgrade-submit.out" + : >"$upgrade_log" + ( printf 'set masters %s\nset myname cfgupgrade\nclient\nwait-primary %s\nupgradeconfig %s\nquit\n' \ + "$MASTERS" "$WAITMS" "$scratch_bin" | xtest ) >"$upgrade_log" 2>&1 & + local upgrade_pid=$! + log "config-upgrade: submitted upgradeconfig in the background (pid=$upgrade_pid, log=$upgrade_log)" + + local DOWN="" round PRIMARY PREV_TERM NEWP PID + for round in $(seq 1 "$kills"); do + log "config-upgrade: kill round $round/$kills" + if [ -n "$DOWN" ]; then + log "config-upgrade: restarting previously-downed $DOWN (no convergence wait — overlapping, like chaotic mode, so the upgrade genuinely interleaves with an in-progress recovery)" + start_node "$DOWN" + fi + PRIMARY="$(primary_from_log)" + if [ -z "$PRIMARY" ]; then + wait_for_primary_log || log "config-upgrade: round $round: no primary elected yet" + PRIMARY="$(primary_from_log)" + fi + if [ -z "$PRIMARY" ]; then + log "config-upgrade: round $round: no primary to kill — skipping" + continue + fi + record_primary "$PRIMARY" + PREV_TERM="$(latest_primary_term)"; PREV_TERM="${PREV_TERM:-0}" + PID="$(pgrep -f -- "$(node_pattern "$PRIMARY")")" + if [ -n "$PID" ]; then + log "config-upgrade: round $round: killing primary $PRIMARY (term=$PREV_TERM)" + kill -9 $PID 2>/dev/null + DOWN="$PRIMARY" + else + log "config-upgrade: round $round: primary $PRIMARY already gone" + fi + sleep 1 + NEWP="$(wait_for_new_primary "$PREV_TERM")" + if [ -n "$NEWP" ]; then + log "config-upgrade: round $round: new primary elected: $NEWP (term=$(latest_primary_term))" + record_primary "$NEWP" + else + log "config-upgrade: round $round: no new primary within window (possible election stall)" + fi + done + + # Restore full 3-of-3 before judging anything. + if [ -n "$DOWN" ]; then + log "config-upgrade: restarting last-downed $DOWN and settling" + start_node "$DOWN" + fi + wait_for_full_convergence \ + || fail "config-upgrade: cluster did not reconverge to 3-of-3 after the chaotic kill sequence" + + log "config-upgrade: waiting for the background upgrade submission to finish" + local waited=0 + while kill -0 "$upgrade_pid" 2>/dev/null && [ "$waited" -lt 65 ]; do + sleep 1 + waited=$((waited + 1)) + done + wait "$upgrade_pid" 2>/dev/null + if ! grep -q "Config upgrade submitted" "$upgrade_log"; then + log "config-upgrade: submission did not report success while interleaved with the kills — retrying once against the now-settled, reconverged cluster (prior log: $(cat "$upgrade_log"))" + printf 'set masters %s\nset myname cfgupgrade\nclient\nwait-primary %s\nupgradeconfig %s\nquit\n' \ + "$MASTERS" "$WAITMS" "$scratch_bin" | xtest >"$upgrade_log" 2>&1 + grep -q "Config upgrade submitted" "$upgrade_log" \ + || fail "config-upgrade: upgradeconfig never succeeded, even after the chaotic sequence settled: $(cat "$upgrade_log")" + fi + log "config-upgrade: upgrade submission confirmed committed" + + # Give every member a moment to apply the marker and materialize its own + # upgrade snapshot (Req 1.1/1.5 — synchronous FROM EACH MEMBER'S OWN + # apply-pump perspective, but a behind/just-restarted member's own apply + # can still lag the marker's commit by a few seconds). + sleep 5 + + # 5. Materialized-state identity (Req 4.1) + job survival. + verify_no_loss \ + || fail "config-upgrade: a committed job was LOST across the upgrade+chaotic-kill scenario" + + local f1 f2 f3 + f1="$(latest_snapshot_file ctrl-1)" || fail "config-upgrade: ctrl-1 has no on-disk checkpoint after the upgrade" + f2="$(latest_snapshot_file ctrl-2)" || fail "config-upgrade: ctrl-2 has no on-disk checkpoint after the upgrade" + f3="$(latest_snapshot_file ctrl-3)" || fail "config-upgrade: ctrl-3 has no on-disk checkpoint after the upgrade" + log "config-upgrade: comparing latest checkpoint files: $f1 vs $f2 vs $f3" + local sdout + sdout="$(printf 'snapdiff %s %s\nquit\n' "$f1" "$f2" | xtest)" + echo "$sdout" | grep -q "IDENTICAL" \ + || fail "config-upgrade: materialized-state DIVERGENCE ctrl-1 vs ctrl-2: $sdout" + sdout="$(printf 'snapdiff %s %s\nquit\n' "$f1" "$f3" | xtest)" + echo "$sdout" | grep -q "IDENTICAL" \ + || fail "config-upgrade: materialized-state DIVERGENCE ctrl-1 vs ctrl-3: $sdout" + log "config-upgrade: materialized state IDENTICAL across all 3 members (checkpoint byte-identity)" + + # 6. Configuration identity (Req 4.2/4.3). configcompare_paths takes each + # member's workdir/name conf-root DIRECTORY — $TOP/controller/ctrl-N, + # NOT .../ctrl-N/conf — it appends "/conf/current" itself + # (configcompare.c's read_member_config_sha256; verified by reading + # the tool's source directly before this invocation). + local ccout + ccout="$(printf 'configcompare %s %s %s\nquit\n' \ + "$TOP/controller/ctrl-1" "$TOP/controller/ctrl-2" "$TOP/controller/ctrl-3" | xtest)" + echo "$ccout" | grep -q "IDENTICAL across 3 members" \ + || fail "config-upgrade: active-CONFIGURATION divergence across members: $ccout" + log "config-upgrade: active configuration IDENTICAL across all 3 members" + + # 7. Host admin-status survival (Req 6.4) — checked DIRECTLY per member, + # not inferred from the aggregate identity checks above. Rotate + # primary through each of the 3 nodes in turn (force_elect_node + # no-ops cheaply if the target is already primary) and assert $host + # shows CLOSED via workerlist each time — the only way to query a + # SPECIFIC member's own live view directly, since a standby cannot + # answer OPCode_get (workerlist) itself. + local n wl + for n in "${NODES[@]}"; do + force_elect_node "$n" || fail "config-upgrade: could not force-elect $n to directly verify its own host admin-status view" + wl="$(printf 'set masters %s\nset myname soak\nclient\nwait-primary %s\nworkerlist\nquit\n' \ + "$MASTERS" "$WAITMS" | xtest)" + echo "$wl" | grep -qE "^${host}[[:space:]]+CLOSED" \ + || fail "config-upgrade: host $host is NOT admin-CLOSED while $n served as primary: $wl" + log "config-upgrade: $host confirmed CLOSED while $n served as primary" + done +} + +# ── Config-upgrade WAL-trim primitives (config-upgrade-snapshot task 8.9) ─── + +# Echo a member's on-disk WAL directory (persist.c's p->wal_path convention: +# $TOP/controller//data/wal — same root wipe_node_data already uses). +wal_dir() { echo "$TOP/controller/$1/data/wal"; } + +# Sorted (ascending by LSN) list of a member's WAL segment file BASENAMES +# (seg-.wal — persist.c's WAL_SEG_FMT). Fixed-width hex filenames +# sort lexicographically == numerically, so a plain `sort` is exact. Echoes +# nothing (not an error) if the directory is empty/missing. +list_wal_segments() { + local node="$1" + ( cd "$(wal_dir "$node")" 2>/dev/null && ls -1 seg-*.wal 2>/dev/null | sort ) +} + +count_wal_segments() { list_wal_segments "$1" | wc -l | tr -d ' '; } + +# Submit job batches against the live primary (via $MASTERS — works +# regardless of which member is currently down) until NODE's own on-disk WAL +# segment count has grown by at least WANT_NEW beyond its count right now. +# Bounded by MAX_ATTEMPTS batches of BATCH jobs each. Task 8.9's own +# instruction is to confirm segment rotation EMPIRICALLY rather than assume +# --wal-segment-bytes produces it at this job volume — a caller MUST treat a +# non-zero return as a real round failure (fail loud), never proceed as if +# rotation happened anyway. +force_n_wal_rotations() { + local node="$1" want_new="$2" batch="$3" max_attempts="$4" + local baseline now attempt=0 + baseline="$(count_wal_segments "$node")" + log "force_n_wal_rotations: $node baseline segment count=$baseline, target +$want_new new (batch=$batch jobs/attempt, max_attempts=$max_attempts)" + while [ "$attempt" -lt "$max_attempts" ]; do + submit_jobs "$batch" || log "force_n_wal_rotations: submit_jobs shortfall this batch (continuing — a partial batch still writes WAL bytes)" + now="$(count_wal_segments "$node")" + attempt=$((attempt + 1)) + log "force_n_wal_rotations: $node segment count=$now after $attempt batch(es) (+$((now - baseline)) vs baseline)" + if [ "$((now - baseline))" -ge "$want_new" ]; then + log "force_n_wal_rotations: $node reached target (+$((now - baseline)) >= +$want_new) after $attempt batches" + return 0 + fi + done + log "force_n_wal_rotations: $node only reached +$((now - baseline)) new segments (wanted +$want_new) after $max_attempts batches of $batch — WAL_SEGMENT_BYTES=$WAL_SEGMENT_BYTES may not be small enough for this job volume" + return 1 +} + +# config-upgrade-snapshot task 8.9 (Req 7.4): repeat the unit-level +# test_marker_triggered_checkpoint_trim_preserves_standby_mid_catchup_segments +# fixture (test_upgrade_snapshot_apply.c) against a REAL 3-node cluster under +# chaotic timing — proving the marker-triggered checkpoint's WAL-segment trim +# (persist_checkpoint_marker_triggered -> trim_wal_segments -> repl_trim_lsn, +# bug-1147's pre-existing retention-floor guard, unmodified by this spec) +# never strands a genuinely mid-catch-up standby's still-needed WAL +# segment(s), under real kill/restart timing and real segment-rotation +# volume instead of hand-controlled LSNs. +# +# Mirrors run_force_snapshot_round's "prove it, don't assume it" discipline: +# every step that depends on empirical timing (segment rotation, guard +# expiry) is confirmed by direct on-disk evidence and fails loud on a +# violated precondition, rather than silently reporting a false PASS that +# would prove nothing (task 8.9's own explicit instruction). +# +# bug-1147's guard has a WALL-CLOCK component the deterministic unit fixture +# never has to reason about: a disconnected standby's floor guard +# (repl.c's last_disconnected_lsn / last_disconnect_time) expires after +# p->config.snap_interval_s (DEFAULT_SNAP_INTERVAL_S = 60s, persist.h/ +# config.h — not exposed by any CLI flag). If this round's kill-to-inspection +# window ever exceeded that budget, the guard would correctly (not a bug) +# stop protecting TARGET's floor segment, and the final assertion below would +# then fail loud — which is CORRECT behavior for a round that ran that slow, +# not a false positive, but it would mean the round proved nothing about the +# guard's mid-catch-up behavior specifically. Elapsed kill-to-inspection time +# is logged so a slow environment is diagnosable rather than silently masked. +# +# Chaos placement: Requirement 7.4 wants this exercised "under the chaotic +# multi-kill conditions Requirement 6 exercises," but a literal CONCURRENT +# second kill during TARGET's down window is structurally impossible here — +# a 3-node cluster has no majority left if 2 of 3 are ever simultaneously +# non-participants, and TARGET must stay down for the WHOLE critical window +# to be genuinely "mid-catch-up" (mirroring the unit fixture's standby that +# never advances past lsn2). Instead, one self-contained chaotic flap of the +# CURRENT primary (kill -> restart WITHOUT waiting for convergence, mirroring +# run_chaotic_rounds' own overlapping-kill style) runs BEFORE the critical +# window begins, giving the round genuine, unplanned term/timing churn up +# front; the cluster is then allowed to settle to a clean, well-understood +# 3-of-3 baseline before TARGET is identified and killed. This is "the +# sequence" Req 7.4 asks for, sequenced rather than concurrent, for a hard +# quorum-math reason, not convenience. +run_config_upgrade_wal_trim_round() { + local rotations batch max_attempts xceadmin scratch_dir scratch_bin + rotations="${XCE_HA_WALTRIM_ROTATIONS:-2}" + batch="${XCE_HA_WALTRIM_BATCH:-15}" + max_attempts="${XCE_HA_WALTRIM_MAX_ATTEMPTS:-20}" + + xceadmin="$(find_xceadmin)" \ + || fail "config-upgrade-wal-trim: xceadmin binary not found (run /xce-build all or /xce-build xceadmin)" + + # 1. One early, self-contained chaotic flap of the CURRENT primary — + # genuine unplanned term/timing churn, fully resolved BEFORE the + # critical mid-catch-up window starts (see header comment: quorum + # math rules out a literal concurrent second kill while TARGET is + # down for the whole window). + local flap_primary flap_prev_term flap_pid flap_new + flap_primary="$(primary_from_log)" + if [ -z "$flap_primary" ]; then + wait_for_primary_log || log "config-upgrade-wal-trim: no primary elected yet before the early chaos flap" + flap_primary="$(primary_from_log)" + fi + if [ -n "$flap_primary" ]; then + flap_prev_term="$(latest_primary_term)"; flap_prev_term="${flap_prev_term:-0}" + flap_pid="$(pgrep -f -- "$(node_pattern "$flap_primary")")" + if [ -n "$flap_pid" ]; then + log "config-upgrade-wal-trim: early chaos flap — killing primary $flap_primary (term=$flap_prev_term)" + kill -9 $flap_pid 2>/dev/null + sleep 1 + start_node "$flap_primary" + flap_new="$(wait_for_new_primary "$flap_prev_term")" + [ -n "$flap_new" ] && record_primary "$flap_new" + log "config-upgrade-wal-trim: early chaos flap settled (new primary probe: ${flap_new:-none yet})" + fi + else + log "config-upgrade-wal-trim: no primary found for the early chaos flap — skipping it (will still proceed once the cluster reconverges)" + fi + wait_for_full_convergence \ + || fail "config-upgrade-wal-trim: cluster did not reconverge to 3-of-3 after the early chaos flap" + log "config-upgrade-wal-trim: 3-of-3 converged after the early chaos flap — starting the critical mid-catch-up window" + + # 2. Identify the primary and a non-primary TARGET to keep down through + # the whole critical window (mirrors run_force_snapshot_round's + # non-primary target-picking convention). + local primary target n + primary="$(discover_primary)" || fail "config-upgrade-wal-trim: no serving primary before picking TARGET" + target="" + for n in "${NODES[@]}"; do + [ "$n" = "$primary" ] || { target="$n"; break; } + done + [ -n "$target" ] || fail "config-upgrade-wal-trim: could not pick a non-primary TARGET" + log "config-upgrade-wal-trim: primary=$primary target=$target (target will be killed and kept down through the marker-triggered trim)" + PRIMARY="$primary" + + # 3. Prime enough segment volume that TARGET's eventual floor lands + # strictly above segment 1 — otherwise there is nothing below the + # floor to trim and the round would prove nothing (task 8.9's own + # warning against a trivially-always-active single segment). + # Confirmed empirically, not assumed. + if [ "$(count_wal_segments "$primary")" -lt 2 ]; then + force_n_wal_rotations "$primary" "$rotations" "$batch" "$max_attempts" \ + || fail "config-upgrade-wal-trim: could not prime >=$rotations WAL segments on $primary before picking TARGET's floor" + fi + verify_no_loss || fail "config-upgrade-wal-trim: job loss during priming, before the critical window even started" + + # 4. Baseline capture: TARGET is still up and the cluster just fully + # reconverged, so the primary's CURRENTLY-ACTIVE segment at this exact + # instant is where TARGET's own floor necessarily sits (it cannot need + # anything the primary hasn't written yet, and being caught up it + # cannot be behind an earlier segment either). This is the direct, + # on-disk analog of the unit fixture's repl_on_ack(lsn2) call — except + # here it is TARGET's real replication state, not a simulated ack. + local baseline_segs seg_at_kill below_segs + baseline_segs="$(list_wal_segments "$primary")" + seg_at_kill="$(printf '%s\n' "$baseline_segs" | tail -1)" + below_segs="$(printf '%s\n' "$baseline_segs" | sed '$d')" # every line except the last + [ -n "$seg_at_kill" ] || fail "config-upgrade-wal-trim: $primary has no WAL segment at baseline capture — cannot identify TARGET's floor" + [ -n "$below_segs" ] || fail "config-upgrade-wal-trim: no segment exists below the baseline active segment on $primary — priming did not produce trim material (should be unreachable after step 3)" + log "config-upgrade-wal-trim: baseline on $primary — floor segment (must survive)=$seg_at_kill; below-floor segment(s) (must be trimmed)=$(printf '%s' "$below_segs" | tr '\n' ' ')" + + # 5. Kill TARGET now, mid-catch-up: it has acked everything up through + # seg_at_kill's coverage and NOTHING past it — exactly "has not yet + # acknowledged the marker's position" (Req 7.4), since the marker has + # not even been built yet at this point. + kill_node "$target" || fail "config-upgrade-wal-trim: could not kill target $target" + local kill_epoch; kill_epoch="$(date +%s)" + log "config-upgrade-wal-trim: $target killed at epoch=$kill_epoch — kept down through the critical window (bug-1147 disconnect-guard budget: 60s default, DEFAULT_SNAP_INTERVAL_S)" + + # 6. While TARGET is down, force >=$rotations MORE segment rotations past + # seg_at_kill on the surviving 2-of-3 majority — a genuine boundary + # case (multiple segments to trim, multiple to preserve), not a + # single trivially-active segment. + force_n_wal_rotations "$primary" "$rotations" "$batch" "$max_attempts" \ + || fail "config-upgrade-wal-trim: could not force >=$rotations new WAL segment rotations past $target's floor while it was down" + verify_no_loss || fail "config-upgrade-wal-trim: job loss while $target was down, before the upgrade was even submitted" + + # 7. Build the upgrade-target cluster.bin (same scratch-copy + one-field + # edit convention as run_config_upgrade_round — an UPDATE to an + # existing queue's description, never an added queue; see that + # function's own comment / bug-1469 for why an added queue would not + # exercise a working live-upgrade path at all). + scratch_dir="$TOP/.cfgupgrade-waltrim-src" + scratch_bin="$TOP/.cfgupgrade-waltrim-src.bin" + rm -rf "$scratch_dir" "$scratch_bin" + cp -r "$REPO/src/configs" "$scratch_dir" + sed -i 's/description: "night queue"/description: "night queue (config-upgrade-snapshot task 8.9 wal-trim soak marker)"/' \ + "$scratch_dir/queues.yaml" + grep -q "task 8.9 wal-trim soak marker" "$scratch_dir/queues.yaml" \ + || fail "config-upgrade-wal-trim: sed did not find the expected 'night queue' description line — src/configs/queues.yaml may have changed shape" + "$xceadmin" config build "$scratch_dir" -o "$scratch_bin" \ + || fail "config-upgrade-wal-trim: xceadmin config build failed for the upgrade-target config" + log "config-upgrade-wal-trim: built upgrade-target cluster.bin: $scratch_bin" + + # 8. Submit the upgrade against the surviving 2-of-3 majority (TARGET is + # still down) — its committed WAL_CONFIG_MARKER apply on $primary is + # what fires persist_checkpoint_marker_triggered -> trim_wal_segments. + local upgrade_out + upgrade_out="$(printf 'set masters %s\nset myname cfgupgrade-waltrim\nclient\nwait-primary %s\nupgradeconfig %s\nquit\n' \ + "$MASTERS" "$WAITMS" "$scratch_bin" | xtest)" + echo "$upgrade_out" | grep -q "Config upgrade submitted" \ + || fail "config-upgrade-wal-trim: upgradeconfig did not report success: $upgrade_out" + log "config-upgrade-wal-trim: upgrade submitted and committed on the surviving majority" + + # 9. Give the primary's own apply pump a moment to apply the marker and + # materialize+trim (Req 1.1/1.5 — synchronous from the applying + # member's own perspective, but still async w.r.t. this shell). + sleep 5 + + local kill_elapsed; kill_elapsed=$(( $(date +%s) - kill_epoch )) + log "config-upgrade-wal-trim: kill-to-inspection elapsed=${kill_elapsed}s (bug-1147 disconnect-guard budget ~60s default)" + if [ "$kill_elapsed" -ge 50 ]; then + log "config-upgrade-wal-trim: WARNING — elapsed time is close to/over the disconnect-guard's default 60s budget; a failure below may reflect a genuinely-expired guard (correct behavior) rather than a real regression. If this round is flaky, investigate environment slowness before suspecting the guard." + fi + + # 10. THE assertion (Req 7.4's actual proof), BEFORE restarting TARGET: + # inspect $primary's real on-disk WAL directory directly. + local post_segs seg + post_segs="$(list_wal_segments "$primary")" + log "config-upgrade-wal-trim: post-trim segments on $primary: $(printf '%s' "$post_segs" | tr '\n' ' ')" + + printf '%s\n' "$post_segs" | grep -qxF "$seg_at_kill" \ + || fail "config-upgrade-wal-trim: TARGET's floor segment $seg_at_kill was TRIMMED — a mid-catch-up standby's still-needed WAL segment was stranded (bug-1147 guard violated under the marker-triggered path). post-trim segments: $post_segs" + log "config-upgrade-wal-trim: floor segment $seg_at_kill correctly PRESERVED (still needed for $target's eventual catch-up)" + + local stranded_ok=1 + while IFS= read -r seg; do + [ -n "$seg" ] || continue + if printf '%s\n' "$post_segs" | grep -qxF "$seg"; then + log "config-upgrade-wal-trim: FAIL evidence — below-floor segment $seg is STILL PRESENT (should have been trimmed)" + stranded_ok=0 + fi + done <<<"$below_segs" + [ "$stranded_ok" -eq 1 ] \ + || fail "config-upgrade-wal-trim: at least one below-floor segment was NOT trimmed by the marker-triggered checkpoint — see FAIL evidence lines above. below-floor set: $below_segs" + log "config-upgrade-wal-trim: all below-floor segment(s) correctly TRIMMED: $(printf '%s' "$below_segs" | tr '\n' ' ')" + + local active_seg + active_seg="$(printf '%s\n' "$post_segs" | tail -1)" + [ -n "$active_seg" ] \ + || fail "config-upgrade-wal-trim: $primary has no active WAL segment after the marker-triggered checkpoint" + [ -f "$(wal_dir "$primary")/$active_seg" ] \ + || fail "config-upgrade-wal-trim: active segment $active_seg reported by listing but missing on disk" + log "config-upgrade-wal-trim: active segment $active_seg correctly PRESENT" + + # 11. ONLY NOW restart TARGET and prove the preserved segment was + # genuinely sufficient for real incremental catch-up, not merely + # present-but-unused — the behavioral capstone. + start_node "$target" + wait_for_full_convergence \ + || fail "config-upgrade-wal-trim: cluster did not reconverge to 3-of-3 after restarting $target — the preserved floor segment did not actually suffice for real incremental catch-up" + log "config-upgrade-wal-trim: $target reconverged (3-of-3) using the preserved floor segment for incremental catch-up" + + verify_no_loss \ + || fail "config-upgrade-wal-trim: a committed job was LOST across the wal-trim-under-marker-trigger scenario" + log "config-upgrade-wal-trim: zero job loss confirmed" +} + # ── Fact-stream primitives (raft-apply-decoupling task 7.2, Req 10.2/10.4) ─── # # Drives a continuous stream of WORKER-FACT messages (jstart/jfinish/jfail — @@ -1925,6 +2589,48 @@ if [ "$MODE" = "array-chaos-retry" ]; then exit 0 fi +# ── Config-upgrade mode: config-upgrade-snapshot task 8.6 ──────────────────── +# Opt-in (--config-upgrade / XCE_HA_MODE=config-upgrade). See +# run_config_upgrade_round's own header comment for the full mechanism trace. +# Single dedicated round, not a loop — like --array-soak/--array-chaos-retry +# (not --force-snapshot's verdict_emit-based counted-verdict style), every +# hard invariant (job survival, materialized-state identity via snapdiff, +# active-configuration identity via configcompare, host admin-status +# survival) is asserted with an immediate fail() inside +# run_config_upgrade_round() itself, so reaching the PASS line below already +# means every check passed — no scan_bug924/V_BUG924 tally here, matching +# array-soak/array-chaos-retry's convention (not force-snapshot/factstream's, +# which feed V_BUG924 into a verdict_emit exclusion). Does NOT run the +# sequential loop or leadership-coverage maneuver. +if [ "$MODE" = "config-upgrade" ]; then + log "MODE=config-upgrade — driving a configuration upgrade interleaved with chaotic multi-kill failover" + run_config_upgrade_round + log "PASS (config-upgrade): ${#ALL_JOBIDS[@]} jobs, zero materialized-state divergence, zero configuration divergence, host admin-status confirmed across all members" + cleanup + trap - EXIT INT TERM + exit 0 +fi + +# ── Config-upgrade WAL-trim mode: config-upgrade-snapshot task 8.9 ────────── +# Opt-in (--config-upgrade-wal-trim / XCE_HA_MODE=config-upgrade-wal-trim). +# See run_config_upgrade_wal_trim_round's own header comment for the full +# mechanism trace and Req 7.4's mid-catch-up WAL-trim proof. Single dedicated +# round, not a loop — like --config-upgrade/--force-snapshot; every hard +# invariant (segment-rotation volume, floor-segment preservation, below-floor +# trim, active-segment preservation, post-restart reconvergence, zero job +# loss) is asserted with an immediate fail() inside +# run_config_upgrade_wal_trim_round() itself, so reaching the PASS line below +# already means every check passed. Does NOT run the sequential loop or +# leadership-coverage maneuver. +if [ "$MODE" = "config-upgrade-wal-trim" ]; then + log "MODE=config-upgrade-wal-trim — exercising the marker-triggered checkpoint's WAL-segment trim against a genuinely mid-catch-up standby under chaotic timing" + run_config_upgrade_wal_trim_round + log "PASS (config-upgrade-wal-trim): ${#ALL_JOBIDS[@]} jobs, below-floor WAL segment(s) trimmed, floor + active segments preserved, zero job loss after real incremental catch-up" + cleanup + trap - EXIT INT TERM + exit 0 +fi + # ── Chaotic mode: overlapping-kill rounds → isolated verdict ────────────────── # Opt-in (--chaotic / XCE_HA_MODE=chaotic). Kills land inside election/catch-up # windows; outcomes are COUNTED (committed divergence + committed job loss) with diff --git a/.kiro/specs/admin-config-tool/research.md b/.kiro/specs/admin-config-tool/research.md index 5690dfe..5b0754a 100644 --- a/.kiro/specs/admin-config-tool/research.md +++ b/.kiro/specs/admin-config-tool/research.md @@ -156,3 +156,60 @@ - [pytest-regressions](https://pytest-regressions.readthedocs.io/en/latest/overview.html) / [GitHub](https://github.com/ESSS/pytest-regressions) — evaluated, not adopted (see Design Decisions) - [pytest-golden PyPI](https://pypi.org/project/pytest-golden/) — ruled out, YAML-only - `src/schema/controller.capnp`, `src/schema/c.capnp`, `src/lib/netio.c`, `src/lib/request.c`, `src/controller/{ha,cluster,config_repl,join,myapp,main}.c`, `src/frontend/xcecli/meson.build`, `src/nixSupport/xce.nix` — primary in-repo sources for all findings above + +--- + +## Cross-Spec Gap Analysis: admin-config-tool × config-upgrade-snapshot × clusterconfig-schema-split (2026-07-28) + +### 1. Current State Investigation + +All three specs touch the same controller-side config surface (`controller.capnp`'s `ClusterConfig`, `config_repl.c`'s `OP_upgradeConfig` handler, `cluster.c`'s dispatch gate) from different angles: + +| Spec | Phase | Scope | +|---|---|---| +| `clusterconfig-schema-split` | `implementation-complete` | Remove per-instance/dead fields (`port`, `candidates`, perf-tuning) from `ClusterConfig` | +| `admin-config-tool` | `implementation-complete` (blocked_on stale — see §2) | `xceadmin` CLI: build/push `cluster.bin` against the controller | +| `config-upgrade-snapshot` | `tasks-generated`, 18/19 actionable tasks `[x]` | Snapshot the config alongside cluster state at every upgrade boundary; activation fencing | + +**Verified current schema state** (`src/schema/controller.capnp:712-726`): `ClusterConfig` has exactly 13 fields (`@0`–`@12`: `clusterName` … `configGeneration`), matching `clusterconfig-schema-split`'s Requirement 3.1 target exactly. `MasterCandidate`/`HashZArrayConfig`/`ResmgrConfig` are gone (Requirements 1.6/2.5). `config-upgrade-snapshot`'s own schema additions (`HostAdminState`, `QueueAdminState`, lines 769/774) are **separate message types**, not fields on `ClusterConfig` itself — **no ordinal collision or renumbering conflict between the two specs' schema work.** + +**Verified dispatch-gate state** (`src/controller/cluster.c:669-694`): the `OPCode_upgradeConfig` polarity-inversion bug that `admin-config-tool`'s `spec.json.blocked_on` and `tasks.md` (line 155) both cite as blocking real-cluster `config push` E2E validation is **already fixed** — commit `959b0cda` (bug-1468, landed 2026-07-25 as part of `config-upgrade-snapshot` task 8.6). The fix's own comment in `cluster.c` explicitly cross-references `admin-config-tool`: *"Independently diagnosed and documented as a blocking risk by the admin-config-tool spec (design.md 'Boundary Commitments' / 'Risks') before config-upgrade-snapshot task 8.6 needed a live OP_upgradeConfig sender and hit the same wall."* + +### 2. Gap Found: `admin-config-tool`'s `blocked_on` is stale documentation, not a live blocker + +`admin-config-tool/spec.json`'s `blocked_on` array still lists: +> "controller OP_upgradeConfig dispatch defect (cluster.c:667-679 vs ha.c:3926-3951) blocks real-cluster config push E2E validation" + +This is the exact same defect as bug-1468, fixed 2026-07-25. Additionally, **the same controller-side `OP_upgradeConfig` path this blocker describes has since been exercised live, repeatedly, and successfully** by `config-upgrade-snapshot`'s own `--config-upgrade` soak (`.claude/skills/xce-test-ha/run-ha-soak.sh`) — dozens of live 3-node runs today alone, all showing correct dispatch, config replication, majority-ack, and `WAL_CONFIG_MARKER` commit. The only difference is the *client*: the soak drives the RPC via `xce_test`'s hand-rolled `upgradeconfig` command (built for `config-upgrade-snapshot` task 8.6, since no other live `OP_upgradeConfig` client existed at the time), not `xceadmin`'s Python `config push`. But the **controller-side code path is identical** for both clients — the dispatch gate doesn't distinguish caller identity. + +- **Gap classification**: Missing (stale tracking data, not missing capability). `admin-config-tool`'s actual E2E validation task (referenced in tasks.md line 155) can very likely be marked done now, or re-run directly with `xceadmin config push` against a live cluster to close it out formally — the blocking condition itself no longer exists. +- **Recommendation for design/task phase**: Clear `admin-config-tool/spec.json`'s `blocked_on` entry (or mark it resolved with a dated note, matching this codebase's own convention — e.g. `clusterconfig-schema-split`'s already-resolved entries and `config-upgrade-snapshot`'s own dated Implementation Notes). If the E2E task was left unchecked pending this, run `xceadmin config push` against a real deployed cluster (`/xce-deploy-ha`) once to get first-hand `xceadmin`-specific confirmation (not just proof the shared controller path works) — the CLI's own TLS/redirect/framing code (Requirements 2–3) has never been proven against the real handler, only mock-tested (per tasks.md's own note). + +### 3. Gap Found (residual, this session): `config-upgrade-snapshot` task 8.6 — new commit-timeout issue post-bug-1477 + +`config-upgrade-snapshot`'s own remaining task (8.6, live chaotic-upgrade soak) was blocked on bug-1472 → then bug-1477 (both now fixed and verified this session — see `.wolf/buglog.json`). Re-running `--config-upgrade` after the bug-1477 fix shows the soak's core assertions (checkpoint-identity, config-identity, host-admin-status survival — the things bug-1471/1472/1477 blocked) all **PASS** for the first time. But the same run then fails later, in the force-elect-rotation step, with repeated commit timeouts (`rc=-110`) on the primary — a step this soak scenario has **never previously reached** (every prior attempt failed earlier). This is very likely a fourth pre-existing, newly-exposed defect in the same family as bug-1471/1472/1474/1477 (surfaced by clearing the earlier blockers, not caused by them) — **not yet root-caused**, flagged for the next investigation pass. Task 8.6 remains open pending this. + +- **Gap classification**: Unknown (root cause not yet investigated — flagged, not analyzed, per this skill's "defer deep research to design phase" principle). +- **Ownership**: Likely `UNCLEAR` until investigated — could be `ha-commit-durability`/`ha-term-safety`/raft-log-replication territory (commit-engine admission capacity or write-quorum under chaos), or a `config-upgrade-snapshot`-adjacent interaction. Follow this session's established routing discipline (bug-1471→1472→1474→1477 precedent): root-cause first, only fix in-place if narrowly scoped, otherwise route to the owning spec and keep task 8.6 blocked. + +### 4. No gap found: `clusterconfig-schema-split` × `admin-config-tool` integration + +`admin-config-tool/requirements.md`'s own Adjacent Expectations section already documents this dependency as "RESOLVED, landed" (commit `519e11c`), and the verified current schema state (§1 above) confirms it: `port`/`candidates`/perf-tuning fields are genuinely absent from `ClusterConfig`, so `xceadmin`'s Requirements 1.8–1.10 (never source these fields) have nothing to accidentally violate — the fields don't exist to source. No further action needed here. + +### 5. No gap found: `clusterconfig-schema-split` × `config-upgrade-snapshot` schema coexistence + +Verified directly (§1): the two specs' schema additions/removals touch disjoint parts of `controller.capnp` (`ClusterConfig`'s field list vs. new standalone `HostAdminState`/`QueueAdminState` structs). No ordinal renumbering conflict, no shared struct mutated by both specs in incompatible ways. + +### Summary Table + +| # | Finding | Classification | Effort | Risk | Action | +|---|---|---|---|---|---| +| 1 | `admin-config-tool` `blocked_on` stale (bug-1468 already fixed) | Missing (tracking, not capability) | S (update spec.json + one live `xceadmin config push` run) | Low | Clear blocker, optionally run one live E2E confirmation | +| 2 | `config-upgrade-snapshot` task 8.6: new commit-timeout past force-elect step | Unknown (not yet root-caused) | Unknown until investigated | Medium–High (commit/write-quorum path) | Dedicated debug pass before considering 8.6 closeable | +| 3 | `clusterconfig-schema-split` ↔ `admin-config-tool` | No gap | — | — | None | +| 4 | `clusterconfig-schema-split` ↔ `config-upgrade-snapshot` schema | No gap | — | — | None | + +### Research Needed (carried forward) +- Root cause of the new post-bug-1477 commit-timeout (finding #2) — not investigated in this pass, flagged only. + +**Resolved during this pass** (no longer open): `admin-config-tool/tasks.md` was audited directly — all 23 tasks are `[x]`, none gated on the stale blocker as an active checklist item. The E2E gap is purely `spec.json.blocked_on` + an informational `tasks.md` note (line 155), not an incomplete task. Confirms finding #1 is pure metadata cleanup, not a reopened implementation gap. diff --git a/.kiro/specs/admin-config-tool/spec.json b/.kiro/specs/admin-config-tool/spec.json index 6c34bbb..8391c70 100644 --- a/.kiro/specs/admin-config-tool/spec.json +++ b/.kiro/specs/admin-config-tool/spec.json @@ -1,9 +1,9 @@ { "feature_name": "admin-config-tool", "created_at": "2026-07-06T01:30:00Z", - "updated_at": "2026-07-22T14:50:00Z", + "updated_at": "2026-07-30T02:01:00Z", "language": "en", - "phase": "implementation-complete", + "phase": "tasks-generated", "approvals": { "requirements": { "generated": true, @@ -20,8 +20,8 @@ }, "ready_for_implementation": true, "blocked_on": [ - "controller OP_upgradeConfig dispatch defect (cluster.c:667-679 vs ha.c:3926-3951) blocks real-cluster config push E2E validation — see research.md Risks", - "RESOLVED 2026-07-22 (bug-1461, commit e53c086): controller.capnp's struct Data shadowed the capnp builtin blob type, miscompiling UpgradeConfigRequest.sha256/.bytes — fixed at the schema root (renamed to XceData), unblocking push_config()'s request construction. The dispatch defect above is separate and still open — push_config() remains mock-tested only, no live E2E." + "RESOLVED 2026-07-25 (bug-1468, commit 959b0cda): controller OP_upgradeConfig dispatch defect (cluster.c) -- myreq_handler's dispatch guard was inverted (introduced by commit fd93997f, 2026-05-31), rejecting the only role that could ever legitimately reach it and making handle_upgrade_config() permanently unreachable from any network client. Fixed by config-upgrade-snapshot task 8.6 (which independently hit the same wall building a live OP_upgradeConfig sender). The controller-side path this blocker described has since been exercised live and successfully many times via config-upgrade-snapshot's --config-upgrade soak. push_config() itself (xceadmin's TLS/redirect/framing code) remains mock-tested only -- a live `xceadmin config push` run against a deployed cluster would give first-hand confirmation of the CLI's own wire code, but the blocking condition (dispatch unreachable) no longer exists.", + "RESOLVED 2026-07-22 (bug-1461, commit e53c086): controller.capnp's struct Data shadowed the capnp builtin blob type, miscompiling UpgradeConfigRequest.sha256/.bytes — fixed at the schema root (renamed to XceData), unblocking push_config()'s request construction. The dispatch defect above (bug-1468) is a separate issue and is now ALSO resolved (see entry above) — push_config() remains mock-tested only, no live xceadmin-specific E2E run yet, but nothing blocks one." ], "gitea": { "milestone_id": 1, diff --git a/.kiro/specs/admin-config-tool/tasks.md b/.kiro/specs/admin-config-tool/tasks.md index 53123b5..9f381f1 100644 --- a/.kiro/specs/admin-config-tool/tasks.md +++ b/.kiro/specs/admin-config-tool/tasks.md @@ -141,6 +141,35 @@ - _Boundary: xceadmin.push, xceadmin.discovery_ - _Depends: 3.3_ +- [ ] 6. Fix reply envelope decode and add live E2E push coverage +- [x] 6.1 Unwrap the `Request` reply envelope before decoding as `RequestReply` + - Live-verified 2026-07-30 against a real deployed single-node controller: `config push` crashes every time with `capnp.lib.capnp.KjException: ... non-list pointer where text was expected`. Root cause: `xce_reply()` (`src/lib/request.c`) wraps every reply — including `config push`'s — in an outer `Request{opcode: OPCode_reply, body: union{replymsg @4: RequestReply}}` envelope (`src/schema/controller.capnp:645-651`) before writing it to the wire. Two call sites decode the raw wire bytes directly as a bare `RequestReply`, skipping the outer envelope, which misaligns every pointer offset: `xceadmin.discovery._redirect_target()` (crashes first, on every reply) and `xceadmin.push.push_config()`'s own `mod.RequestReply.from_bytes(reply_bytes)` (same latent bug, currently unreached only because discovery crashes first — fixing discovery alone is not sufficient). The controller side is not at fault: server logs confirm the same request's dispatch, commit, and activation all succeed for the exact bytes that then crash the client on decode. + - Both decode sites unwrap `Request.body.replymsg` before treating the bytes as a `RequestReply` — introduce one shared decode helper (e.g. in `xceadmin.discovery`, which `xceadmin.push` already imports from) rather than duplicating the unwrap logic at each call site + - `config push` against a real controller (mock or live) succeeds end to end: exits 0, prints `versionTag`/`ackedCount`, no `KjException` + - Redirect-following (standby → primary) still decodes correctly through the fixed unwrap — existing task 5.6 mock-based redirect tests continue to pass unmodified after their mock reply fixtures are updated to the real envelope shape + - _Requirements: 2.1, 2.5, 3.1, 3.2, 7.2, 7.3_ + - _Boundary: xceadmin.discovery, xceadmin.push_ + - _Depends: 3.2, 3.3_ + +- [x] 6.2 Add a live single-node E2E test for `config push` + - New test deploys one real `xce_controller` (no HA peers needed — reachability/decode correctness is what's under test, not consensus), runs `xceadmin config build` against `src/configs/`, then a real `xceadmin config push` against it over the actual TLS+capnp wire protocol — no mock server + - Test asserts exit 0, a parsed `versionTag`/`ackedCount` in the output, and confirms the controller's own log shows the config committed and activated + - Skips cleanly (not a hard failure) when no controller binary is available in the current build profile, matching this suite's existing cert-dependent skip convention (see task 5.3's Implementation Notes) + - _Requirements: 2.1, 2.5, 2.6, 3.1_ + - _Boundary: xceadmin (test-only, cross-cutting with the built controller binary)_ + - _Depends: 6.1_ + +- [ ] 6.3 Add a live 3-node HA E2E test for `config push` (success path + redirect) + - Task 6.2 proved a single-node deployment always returns `ackedCount == 0` and exits 1 even on full server-side success (no standbys exist to ACK) — the `acked_count > 0` exit-0 success path, and Requirement 3's redirect-following, have never been exercised against a real controller, only against mocks (task 5.6) or a topology structurally unable to reach them (task 6.2). This task closes both gaps in one live 3-node deployment. + - Deploys a real 3-node HA `xce_controller` cluster (reuse `deploy-ha.sh`'s existing 3-node pattern, e.g. `localhost:19991/19992/19993`, staggered start for clean election per this repo's existing convention), waits for a primary to be elected + - Pushing to the primary directly: real `xceadmin config push` exits 0, reports `ackedCount > 0` (a real positive count from real standby ACKs, not the single-node `0` case), and the controller logs confirm commit/activate on the primary and replication/ack on at least one standby + - Pushing to a standby node: `xceadmin` follows the redirect to the primary (Requirement 3.1, 3.3), the push still succeeds end-to-end, and the redirect is visible either in `xceadmin`'s own stderr redirect message (`discovery.py`'s existing "redirected: host:port -> host:port" line) or equivalent captured evidence + - Skips cleanly (not a hard failure) when no controller binary is available, matching task 6.2's convention; reuses task 6.2's cleanup discipline (kill all node processes, remove scratch deploy dir, on both pass and failure paths) — check whether task 6.2's fixture/helpers can be extracted and reused for the multi-node case rather than duplicated + - _Requirements: 2.1, 2.5, 2.6, 3.1, 3.2, 3.3_ + - _Boundary: xceadmin (test-only, cross-cutting with the built controller binary)_ + - _Depends: 6.2_ + - _Blocked: standby-redirect half is DONE and correct (round-1 reviewer independently re-verified: OP_upgradeConfig has no server-side redirect wiring today, matches design.md's own pre-existing "Out of Boundary" gap; test correctly locks in real current rejection behavior). Primary-push success-path test is flaky (~24/25 live fails in round-2, see bug-1485) — elected primary observed as a `` zombie shortly after promotion, but a dedicated debug round could NOT reproduce this in 26+ clean live runs on an idle host and could not capture any crash evidence (stderr was DEVNULL'd in the original failing runs). Leading theory: round-2's failures were environment contamination (stale venv, concurrent build/test load) rather than a deterministic product bug, but this is unconfirmed either way. Uncommitted work (test_e2e_live_ha_push.py, _live_e2e_common.py, test_e2e_live_push.py refactor) is left in the worktree, not discarded — re-run the primary-push test 20-25x standalone on an otherwise-idle host with real stderr capture (not DEVNULL) before deciding whether it's mergeable as-is, needs the settle-window-to-real-poll fix noted in bug-1485, or points to a real controller-side race requiring a separate task._ + ## Implementation Notes - **1.3**: nix's bare `python3` does not put `pip` on PATH — `python3Packages.pip` had to be added to `nativeBuildInputs` alongside the packages design.md's Technology Stack table lists; not a spec gap, just an operational dependency the table didn't need to spell out. @@ -152,7 +181,7 @@ - **2.4**: `errors.py`'s exception subclasses (task 1.2) all take `message` as an explicit first constructor argument in addition to their structured fields (e.g. `ConnectionTimeoutError(message, host, port)`, `ReplyDecodeError(message, reason)`) — design.md's abbreviated `Service Interface` type stubs (`class ConnectionTimeoutError(XceAdminError): host: str; port: int`) read as if only the structured fields were needed; always check the real constructor in `errors.py`, not the design doc's shorthand. `xcecommon.wire` is deliberately opcode-agnostic — `send_request`/`send_frame`/`recv_frame` move raw `bytes` only and never import a capnp type; callers own `.to_bytes()`/`.from_bytes()`. Reused `ha/data/xce.crt`/`xce.key` (the repo's existing dev cert pair, same one `deploy-ha.sh` already copies for controller TLS) as the test fixture for both the TLS test server and the client `cert_dir` — no synthetic cert generation needed. - **3.1**: Requirement 1.7's "unrecognized-but-schema-valid field" warning is real and fires on essentially every real build using `src/configs/resources.yaml` — `resources.yaml`'s `type` key is *required* by `resources.schema.json` (`required: [name, type]`) but has no `ClusterConfig` destination (per `xcecommon.mapping`'s documented decision not to guess the `valtype`/`ordtype`/`flags` integer encoding), so every valid resource entry triggers a "field 'type' ... ignored" warning unconditionally, not just for unusual input. This is a disclosed spec tradeoff, not a bug — flagged here so a future pass over `xceadmin.build`'s warning UX (e.g. only warning once per field-name per run instead of once per item) knows the noise is expected, not a regression. `xceadmin.build`'s unmapped-field table (`_UNMAPPED_BUT_VALID_ITEM_KEYS`) was derived by cross-referencing `xcecommon.mapping`'s per-item builder functions against the real `src/configs/schema/*.schema.json` property lists directly (not from prose alone) to avoid drift. - **3.2**: design.md's Dependencies list for `xceadmin.discovery` names only `xcecommon.wire`, but decoding a reply to inspect `RequestReply.redirectHost`/`.redirectPort` genuinely requires `xcecommon.schema` too (verified real field names against `controller.capnp:594-595`, which matched design.md exactly this time — unlike task 2.2's `Reply`/`RequestReply` struct-name slip). Treated as a design-doc omission, not license to hand-roll capnp decoding. `follow_redirects`'s `cert_dir` parameter is accepted for signature parity with design.md but unused internally — all I/O, including TLS setup, is delegated to the caller's `send_fn` closure, which is expected to already carry its own `cert_dir`. A connection timeout to any hop (including a non-initial one reached via redirect) raises `NoPrimaryError` naming that specific hop, not the original target. -- **bug-1461 (out-of-band, between 3.2 and 3.3)**: `controller.capnp` had a real, confirmed schema bug — a locally-declared `struct Data` (an `OPCode_get` query-result tagged union) shadowed Cap'n Proto's builtin `Data` blob type for every later `: Data` field in the file, miscompiling `UpgradeConfigRequest.sha256`/`.bytes` (and 5 other fields across `ReplConfigReply`/`ReplConfigPushRequest`/`ReplEnvelope`/`SnapshotTransfer`/`WalCatchupEntry`/`CtrlHelloRequest`, several HA-critical) as a struct-pointer type instead of a byte blob — blocking `push_config()` from constructing a valid request via pycapnp. Fixed at the root (renamed the local struct to `XceData`, `$C.mapname("xce_data_t")` unchanged so the C typedef is stable) across 20 files spanning controller/lib/scheduler/Go — see commit `e53c086` and `.wolf/buglog.json` bug-1461 for the full investigation and fix. This was NOT an admin-config-tool-boundary change; it's a pre-existing, cross-component schema defect that happened to block this task. `push_config()`'s real controller counterpart remains untested live — a *separate*, already-documented dispatch-gate defect (`ha_dispatch_gate()`/`cluster.c`, spec.json `blocked_on`) still blocks that independently of bug-1461. +- **bug-1461 (out-of-band, between 3.2 and 3.3)**: `controller.capnp` had a real, confirmed schema bug — a locally-declared `struct Data` (an `OPCode_get` query-result tagged union) shadowed Cap'n Proto's builtin `Data` blob type for every later `: Data` field in the file, miscompiling `UpgradeConfigRequest.sha256`/`.bytes` (and 5 other fields across `ReplConfigReply`/`ReplConfigPushRequest`/`ReplEnvelope`/`SnapshotTransfer`/`WalCatchupEntry`/`CtrlHelloRequest`, several HA-critical) as a struct-pointer type instead of a byte blob — blocking `push_config()` from constructing a valid request via pycapnp. Fixed at the root (renamed the local struct to `XceData`, `$C.mapname("xce_data_t")` unchanged so the C typedef is stable) across 20 files spanning controller/lib/scheduler/Go — see commit `e53c086` and `.wolf/buglog.json` bug-1461 for the full investigation and fix. This was NOT an admin-config-tool-boundary change; it's a pre-existing, cross-component schema defect that happened to block this task. `push_config()`'s real controller counterpart was, separately, blocked by a dispatch-gate defect (`ha_dispatch_gate()`/`cluster.c`) — **RESOLVED 2026-07-25 (bug-1468, commit `959b0cda`)**, fixed by `config-upgrade-snapshot` task 8.6 hitting the same wall building a live `OP_upgradeConfig` sender; that path has since been exercised live and successfully many times via that spec's `--config-upgrade` soak. Nothing blocks a live `push_config()` E2E run anymore, though `xceadmin`'s own TLS/redirect/framing code has not yet had one specifically. - **3.3**: `probe_config()` does NOT go through `xceadmin.discovery.follow_redirects` — `ProbeConfigTagReply` is a direct struct with only `configTag`, no `redirectHost`/`.Port` fields exist on it at all, so there is no redirect signal for `follow_redirects` (which unconditionally decodes replies as `RequestReply`) to read; only `push_config()`'s `Request`/`RequestReply`-wrapped exchange supports redirects. `ProbeConfigTagReply` also carries no accept/reject signal — `DryRunResult.accepted` is a client-side inference (true on any successful round-trip), matching the real C reference client (`config_repl.c`'s `xce_probe_config_tag`, which also always sends an empty `name` and returns only a bare tag). pycapnp union field assignment for Void/Text-typed variants (e.g. `reply.data.nodata = None`, `reply.data.debugmsg = "..."`) must use direct assignment, not `.init(name)` — `.init()` without a size is only valid for struct/list/data-typed variants, confirmed via `KjException: init() without a size is only valid for struct and object fields`. - **4.1**: `xcecommon.wire.connect()` deliberately lets `ConnectionRefusedError`/other bare `OSError`s propagate unwrapped (documented in `wire.py`'s own module docstring) — `xceadmin.cli` is the layer that catches `OSError` and formats it per Requirement 7.1, alongside its `except XceAdminError` dispatch surface; a task 4.1 implementer must not assume `XceAdminError` alone covers every network failure mode. click 8.3.1's `CliRunner` no longer accepts `mix_stderr=`; `result.stdout`/`.stderr` are separated by default, but `CliRunner`'s output capture decodes as text and is **lossy for arbitrary binary** (confirmed: `bytes(range(256))` does not round-trip through the captured `.output` string) — do not assert exact byte content of a `-o -` binary write through `CliRunner`; that's already covered at the `write_output()` unit level (task 3.1's `test_config_build.py`). A CLI test that omits `-o` falls through to the real default (`cluster.bin`, relative to CWD) — always pass an explicit `-o ` in tests that reach the write step, or the test will write a stray artifact into the actual repo working directory (caught via `git status` before commit, not by the test itself). - **4.2**: `deploy-ha.sh` resolves both `xceadmin` (`$SCRIPT_DIR/../xceadmin/.venv/bin/xceadmin`) and the YAML configs source (`$SCRIPT_DIR/../configs`) relative to the script's own location (`$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)`), not the caller's CWD — matches the project's other relative-path scripts and keeps the deploy working regardless of where it's invoked from. `--build-config` is parsed out of `"$@"` before positional-arg assignment so it can appear anywhere in the argument list, not just a fixed position. Verified live against the real `xceadmin` build and `src/configs/`: missing `cluster.bin` auto-builds (8.4), an existing one with no flag is left byte-for-byte untouched — same mtime, same SHA (8.5), and `--build-config` against an existing `cluster.bin` forces a rebuild that reproduces byte-identical content (8.3, confirming 9.1's determinism guarantee holds through this path too). @@ -165,4 +194,7 @@ - **Post-implementation, out-of-band (2026-07-22, second pass)**: `meson-build.sh`/`meson-install.sh` no longer resolve `python3` via a bare PATH lookup — `meson.build` now pins it once via `import('python').find_installation('python3')` (same mechanism as `find_program('go')`/capnp/packcc elsewhere in this build, visible at `meson setup` time as `Program python3 found: YES (/nix/store/...)`) and threads the resolved path into both scripts explicitly. Verified: `meson setup` prints the pinned interpreter, rebuild stays 165/165 green, and the built venv's own `python3` resolves through to that exact store path. - **Post-implementation, out-of-band (2026-07-22, third pass — removes `ha/data/` entirely)**: `deploy-ha.sh` no longer takes a `` argument at all (`--build-config` flag also removed) — every invocation now generates a fresh self-signed TLS cert/key (`openssl req -x509 -newkey rsa:2048 -nodes -days 3650`, 10y validity) directly into the deploy dir's `certs/`, and builds `cluster.bin` directly into `controller/ctrl-1/conf/` via `xceadmin`, with no intermediate staging directory. `run-ha-soak.sh` (`/xce-test-ha`) updated to match: dropped its own `XCE_HA_DATADIR`-based precondition entirely, since `deploy-ha.sh` now handles both cert and config generation itself. Updated 4 callers (`run-ha-soak.sh`, `test-heartbeat-tolerance.sh`, `test-commit-durability.sh`, plus both `xce-deploy-ha`/`xce-test-ha` SKILL.md docs) to the new 3-arg signature. `ha/data/{xce.crt,cluster.bin}` removed from git tracking (`cluster.bin` was already gitignored from the prior pass; the certs were a real checked-in TLS private key, now gone from history going forward). +- **6.2**: A genuinely single-node (zero-peer) controller always computes `ackedCount == 0` for `config push` — no standbys exist to ACK — even when the config change commits and activates successfully server-side (`config_repl.c`'s `push_config_to_standbys`/`do_upgrade_config_with_bytes`). `xceadmin.cli`'s postcondition (`acked_count > 0` required for exit 0) can't distinguish "no standbys exist" from "push failed," so a real single-node `config push` always exits 1 with `"push rejected (ackedCount == 0)"` even on full success — reproduced live and independently re-confirmed by the reviewer against real `config_repl.c`/`repl.c` source. Verified spec-consistent (matches `cli.py`/design.md's own exit-0-iff-`acked_count>0` postcondition as written), not a regression from this task. `test_e2e_live_push.py` asserts this real exit-1/ackedCount==0 behavior directly rather than the task text's literal "exit 0," and independently proves genuine server-side success via the controller's own commit/activate log lines. Out of this task's boundary to fix; a future task should decide whether single-node pushes deserve a distinct success signal in `xceadmin.cli`/`push.py` (e.g. treating a fully-connected zero-peer topology as trivially quorate) rather than always reading as a CLI failure. +- **6.1**: `decode_reply()` (new, `discovery.py`) is the single unwrap point for the `Request{opcode: reply, body.replymsg: RequestReply}` envelope every real controller reply arrives in (`xce_reply()`, `src/lib/request.c:384-418`) — both `discovery._redirect_target()` and `push.push_config()` go through it; `probe_config()` is untouched (`ProbeConfigTagReply` is never envelope-wrapped). Fixing the two documented call sites alone was insufficient — task 5.6's own mock-server test fixtures (`test_discovery.py`, `test_config_push_mock.py`) AND `test_cli.py`'s two `config push` mock handlers all constructed bare, unwrapped `RequestReply` bytes, meaning the entire existing test suite had been silently validating the wrong wire shape since task 5.6/task 4.1. All fixed via one shared `wrap_reply` fixture in `conftest.py`. Any future test that hand-builds a controller reply for a mock server must wrap it the same way, or it will pass against a mock while still being broken against a real controller. + Investigating this surfaced a real, independent finding: `xcecommon.wire.connect()` was loading a **client-side** TLS cert (`context.load_cert_chain(...)` on the `PROTOCOL_TLS_CLIENT` context) — verified against the actual reference implementation (`netio.c`'s `create_ssl_context()`) that the real client presents **no** certificate at all when `cert_file`/`key_file` are `NULL` (bare `TLS_client_method()`, no `SSL_CTX_use_certificate_chain_file`/`SSL_CTX_use_PrivateKey_file` call). `xceadmin`'s client diverged from the reference client it's meant to mirror. Fixed: `connect()` no longer loads a client cert or takes a `cert_dir` parameter at all. Since nothing else consumed `cert_dir` (no CA verification happens either — `verify_mode=CERT_NONE` throughout), removed it end-to-end: `xceadmin.discovery.follow_redirects()`'s `cert_dir` param (already dead/`noqa`'d — signature-parity leftover), `xceadmin.push.push_config()`/`probe_config()`, and the `--cert-dir` CLI flag on `config push`. Server-side cert loading (the mock TLS servers in `test_wire.py`/`test_cli.py`/`test_config_push_mock.py`) is unaffected and still needed — moved into a shared session-scoped `tls_certs` fixture in a new `tests/conftest.py` (openssl-generated, same approach as `deploy-ha.sh`), replacing 3 duplicated module-level `REPO_HA_DATA_DIR`/`pytest.mark.skipif(not ha/data/xce.crt...)` blocks. Net result: those 3 files' TLS-dependent tests no longer skip under a hermetic `nix build` sandbox (which never had `ha/data/` in its git-tracked-only source) — verified 165/165 passed, 0 skipped, both via `meson compile` and via a full `nix build --option sandbox false .#xcecore_debug` rebuild (previously 128 passed / 37 skipped there). Requirements 2.3/2.4 and 8.3/8.4/8.5 marked superseded in `requirements.md` with dated correction notes rather than silently rewritten. diff --git a/.kiro/specs/clusterconfig-schema-split/research.md b/.kiro/specs/clusterconfig-schema-split/research.md index b6eb28d..cb43fa9 100644 --- a/.kiro/specs/clusterconfig-schema-split/research.md +++ b/.kiro/specs/clusterconfig-schema-split/research.md @@ -94,3 +94,60 @@ The task 1.1 implementer deliberately left `HashZArrayConfig` and `ResmgrConfig` Task 5.3's reviewer, verifying the live single-node scenarios, built and ran the actual pre-spec baseline (commit `94f50ce`, HEAD before this spec's first commit) for comparison — and found single-node startup (`xce_controller` with no `--peers`) was **already exiting with `-EINVAL`**, unconditionally, before this spec began. Root cause: `myapp_run()` (`src/controller/myapp.c`) calls `cluster_open_listener()` before the primary config (`cluster_config`) is loaded from disk, so the pre-spec fallback branch (`cluster_config->port`, only reachable when `cluster_config != NULL`) always hit its `else` branch. Logged as `bug-1457` (unrelated to this spec, not fixed as its own change — task 2.1's rewrite incidentally repaired it, verified live in task 5.3). **This invalidates part of this spec's own premise, stated in the Introduction and Requirement 1.7's original correction**: "`cluster_open_listener`... has a live fallback to `cluster_config->port`... the sole port-sourcing mechanism for single-node deployments" and "single-node controller startup SHALL continue to work exactly as it does today." In reality, it did not work today (pre-spec) — for a reason entirely unrelated to `ClusterConfig`'s schema. The spec's actual behavior (task 2.1's hardcoded-default fallback, independent of `cluster_config` load state) is still correct and was still the right thing to build — it just fixed a real bug as a side effect, rather than merely "preserving" already-working behavior as originally framed. Not correcting the historical Introduction/Requirement 1.7 text itself (it accurately reflects what was believed and reviewed at design time); this note is the record of what live verification actually found. + +--- + +## Cross-Spec Gap Analysis: admin-config-tool × config-upgrade-snapshot × clusterconfig-schema-split (2026-07-28) + +### 1. Current State Investigation + +All three specs touch the same controller-side config surface (`controller.capnp`'s `ClusterConfig`, `config_repl.c`'s `OP_upgradeConfig` handler, `cluster.c`'s dispatch gate) from different angles: + +| Spec | Phase | Scope | +|---|---|---| +| `clusterconfig-schema-split` | `implementation-complete` | Remove per-instance/dead fields (`port`, `candidates`, perf-tuning) from `ClusterConfig` | +| `admin-config-tool` | `implementation-complete` (blocked_on stale — see §2) | `xceadmin` CLI: build/push `cluster.bin` against the controller | +| `config-upgrade-snapshot` | `tasks-generated`, 18/19 actionable tasks `[x]` | Snapshot the config alongside cluster state at every upgrade boundary; activation fencing | + +**Verified current schema state** (`src/schema/controller.capnp:712-726`): `ClusterConfig` has exactly 13 fields (`@0`–`@12`: `clusterName` … `configGeneration`), matching `clusterconfig-schema-split`'s Requirement 3.1 target exactly. `MasterCandidate`/`HashZArrayConfig`/`ResmgrConfig` are gone (Requirements 1.6/2.5). `config-upgrade-snapshot`'s own schema additions (`HostAdminState`, `QueueAdminState`, lines 769/774) are **separate message types**, not fields on `ClusterConfig` itself — **no ordinal collision or renumbering conflict between the two specs' schema work.** + +**Verified dispatch-gate state** (`src/controller/cluster.c:669-694`): the `OPCode_upgradeConfig` polarity-inversion bug that `admin-config-tool`'s `spec.json.blocked_on` and `tasks.md` (line 155) both cite as blocking real-cluster `config push` E2E validation is **already fixed** — commit `959b0cda` (bug-1468, landed 2026-07-25 as part of `config-upgrade-snapshot` task 8.6). The fix's own comment in `cluster.c` explicitly cross-references `admin-config-tool`: *"Independently diagnosed and documented as a blocking risk by the admin-config-tool spec (design.md 'Boundary Commitments' / 'Risks') before config-upgrade-snapshot task 8.6 needed a live OP_upgradeConfig sender and hit the same wall."* + +### 2. Gap Found: `admin-config-tool`'s `blocked_on` is stale documentation, not a live blocker + +`admin-config-tool/spec.json`'s `blocked_on` array still lists: +> "controller OP_upgradeConfig dispatch defect (cluster.c:667-679 vs ha.c:3926-3951) blocks real-cluster config push E2E validation" + +This is the exact same defect as bug-1468, fixed 2026-07-25. Additionally, **the same controller-side `OP_upgradeConfig` path this blocker describes has since been exercised live, repeatedly, and successfully** by `config-upgrade-snapshot`'s own `--config-upgrade` soak (`.claude/skills/xce-test-ha/run-ha-soak.sh`) — dozens of live 3-node runs today alone, all showing correct dispatch, config replication, majority-ack, and `WAL_CONFIG_MARKER` commit. The only difference is the *client*: the soak drives the RPC via `xce_test`'s hand-rolled `upgradeconfig` command (built for `config-upgrade-snapshot` task 8.6, since no other live `OP_upgradeConfig` client existed at the time), not `xceadmin`'s Python `config push`. But the **controller-side code path is identical** for both clients — the dispatch gate doesn't distinguish caller identity. + +- **Gap classification**: Missing (stale tracking data, not missing capability). `admin-config-tool`'s actual E2E validation task (referenced in tasks.md line 155) can very likely be marked done now, or re-run directly with `xceadmin config push` against a live cluster to close it out formally — the blocking condition itself no longer exists. +- **Recommendation for design/task phase**: Clear `admin-config-tool/spec.json`'s `blocked_on` entry (or mark it resolved with a dated note, matching this codebase's own convention — e.g. `clusterconfig-schema-split`'s already-resolved entries and `config-upgrade-snapshot`'s own dated Implementation Notes). If the E2E task was left unchecked pending this, run `xceadmin config push` against a real deployed cluster (`/xce-deploy-ha`) once to get first-hand `xceadmin`-specific confirmation (not just proof the shared controller path works) — the CLI's own TLS/redirect/framing code (Requirements 2–3) has never been proven against the real handler, only mock-tested (per tasks.md's own note). + +### 3. Gap Found (residual, this session): `config-upgrade-snapshot` task 8.6 — new commit-timeout issue post-bug-1477 + +`config-upgrade-snapshot`'s own remaining task (8.6, live chaotic-upgrade soak) was blocked on bug-1472 → then bug-1477 (both now fixed and verified this session — see `.wolf/buglog.json`). Re-running `--config-upgrade` after the bug-1477 fix shows the soak's core assertions (checkpoint-identity, config-identity, host-admin-status survival — the things bug-1471/1472/1477 blocked) all **PASS** for the first time. But the same run then fails later, in the force-elect-rotation step, with repeated commit timeouts (`rc=-110`) on the primary — a step this soak scenario has **never previously reached** (every prior attempt failed earlier). This is very likely a fourth pre-existing, newly-exposed defect in the same family as bug-1471/1472/1474/1477 (surfaced by clearing the earlier blockers, not caused by them) — **not yet root-caused**, flagged for the next investigation pass. Task 8.6 remains open pending this. + +- **Gap classification**: Unknown (root cause not yet investigated — flagged, not analyzed, per this skill's "defer deep research to design phase" principle). +- **Ownership**: Likely `UNCLEAR` until investigated — could be `ha-commit-durability`/`ha-term-safety`/raft-log-replication territory (commit-engine admission capacity or write-quorum under chaos), or a `config-upgrade-snapshot`-adjacent interaction. Follow this session's established routing discipline (bug-1471→1472→1474→1477 precedent): root-cause first, only fix in-place if narrowly scoped, otherwise route to the owning spec and keep task 8.6 blocked. + +### 4. No gap found: `clusterconfig-schema-split` × `admin-config-tool` integration + +`admin-config-tool/requirements.md`'s own Adjacent Expectations section already documents this dependency as "RESOLVED, landed" (commit `519e11c`), and the verified current schema state (§1 above) confirms it: `port`/`candidates`/perf-tuning fields are genuinely absent from `ClusterConfig`, so `xceadmin`'s Requirements 1.8–1.10 (never source these fields) have nothing to accidentally violate — the fields don't exist to source. No further action needed here. + +### 5. No gap found: `clusterconfig-schema-split` × `config-upgrade-snapshot` schema coexistence + +Verified directly (§1): the two specs' schema additions/removals touch disjoint parts of `controller.capnp` (`ClusterConfig`'s field list vs. new standalone `HostAdminState`/`QueueAdminState` structs). No ordinal renumbering conflict, no shared struct mutated by both specs in incompatible ways. + +### Summary Table + +| # | Finding | Classification | Effort | Risk | Action | +|---|---|---|---|---|---| +| 1 | `admin-config-tool` `blocked_on` stale (bug-1468 already fixed) | Missing (tracking, not capability) | S (update spec.json + one live `xceadmin config push` run) | Low | Clear blocker, optionally run one live E2E confirmation | +| 2 | `config-upgrade-snapshot` task 8.6: new commit-timeout past force-elect step | Unknown (not yet root-caused) | Unknown until investigated | Medium–High (commit/write-quorum path) | Dedicated debug pass before considering 8.6 closeable | +| 3 | `clusterconfig-schema-split` ↔ `admin-config-tool` | No gap | — | — | None | +| 4 | `clusterconfig-schema-split` ↔ `config-upgrade-snapshot` schema | No gap | — | — | None | + +### Research Needed (carried forward) +- Root cause of the new post-bug-1477 commit-timeout (finding #2) — not investigated in this pass, flagged only. + +**Resolved during this pass** (no longer open): `admin-config-tool/tasks.md` was audited directly — all 23 tasks are `[x]`, none gated on the stale blocker as an active checklist item. The E2E gap is purely `spec.json.blocked_on` + an informational `tasks.md` note (line 155), not an incomplete task. Confirms finding #1 is pure metadata cleanup, not a reopened implementation gap. diff --git a/.kiro/specs/config-upgrade-snapshot/design.md b/.kiro/specs/config-upgrade-snapshot/design.md new file mode 100644 index 0000000..e1d722d --- /dev/null +++ b/.kiro/specs/config-upgrade-snapshot/design.md @@ -0,0 +1,432 @@ +# Design Document: config-upgrade-snapshot + +## Overview + +**Purpose**: This feature makes a configuration upgrade on an already-running XCE cluster materialize one identical, entity-bearing state snapshot at the configuration-change marker's `(term, lsn)` boundary, embed the new configuration in it, and install that same snapshot on every member — closing bug-857 (post-upgrade materialized-state divergence) by construction, rather than by per-node WAL replay under the new configuration. + +**Users**: Cluster operators pushing a configuration change (via `xceadmin`/the upgrade-config admin path) and, transitively, every job/queue/host in flight at the moment of the change — this feature is what keeps their materialized state identical across all controller members through the transition. + +**Impact**: Retires the current "commit marker → restart every controller → each member replays its own pre-upgrade WAL under the new configuration" behavior (`do_upgrade_config_with_bytes`, `config_repl.c:1591-1773`, step 9) in favor of a synchronous, in-process materialization trigger on marker apply. No controller restart is required for a configuration upgrade after this change. + +### Goals +- Materialize a full entity-bearing snapshot (jobs, queues, hosts, embedded configuration) at the exact `(term, lsn)` of the committed configuration-change marker, on every member, without any member re-deriving state by WAL replay. +- Gate a serving primary's acceptance of state-changing client requests on its OWN materialization-and-hash-verification for the current marker having completed — independent of Raft's promotion eligibility. +- Survive crash, restart, and leadership change at any point in the upgrade sequence, with deterministic, idempotent resumption. +- Prove the fix with a regression that reproduces bug-857 on the old code path and passes on the new one, including chaotic multi-kill failover interleaved with the upgrade. + +### Non-Goals +- Initial/bootstrap configuration replication (config tag zero → first config) — owned by `ha-config-bootstrap`; not unified with this mechanism (requirements.md Boundary Context, decided and rejected 2026-07-23). +- The configuration-change marker's consensus ordering itself, or the Raft protocol — owned by `ha-term-safety` / the Raft TLA+ Conformance library series. +- Controller voting-set/membership changes — `ha-config-bootstrap`. +- Fixing the pre-existing, out-of-scope `durable_lsn`-not-advanced-by-snapshot-install gap (research.md, this session) — real but bounded to self-promotion-eligibility bookkeeping, predates this spec, applies to any snapshot install (not upgrade-specific). + +## Boundary Commitments + +### This Spec Owns +- The `WAL_CONFIG_MARKER` apply-time side effect: triggering a forced, synchronous checkpoint at marker-apply time (new `apply_committed_entry` case). +- Embedding full configuration bytes (not just a `{tag, sha}` reference) in the upgrade snapshot, and in every subsequent checkpoint until rotated away. +- The host admin-state snapshot frame (new) and the queue admin-state frame's migration to Cap'n Proto (existing raw layout retired) — one `SNAPSHOT_FORMAT_VERSION` bump covers both. +- The activation fence: a new, independent condition gating primary request-serving and promotion on this member's own materialization-and-hash-verification for the current marker. +- Retiring the per-node restart/replay upgrade path (`do_upgrade_config_with_bytes` step 9). +- Regression coverage: bug-857 reproduction, crash/leadership-change injection at the marker→snapshot-durable and marker→all-installed windows, host-placeholder/rejoin, overlapping upgrades, and format-mismatch fail-loud behavior. + +### Out of Boundary +- Entity-serialization machinery itself (job/queue capnp encode, checkpoint file layout, chunked transport) — owned by `ha-entity-snapshots`, already shipped; this spec extends it in the two narrow, explicit ways above, not otherwise. +- The configuration-change marker's append/commit and `(term, lsn)` ordering — owned by `ha-term-safety` Requirement 7; this spec only reacts to the marker once committed. +- Raft election, log replication, term safety — the Raft TLA+ Conformance library series. +- Fixing `durable_lsn` non-advancement on snapshot-install (see Non-Goals). +- Initial/bootstrap config replication — `ha-config-bootstrap`. + +### Allowed Dependencies +- `ha-entity-snapshots`'s `write_snapshot`/`load_snapshot`/`persist_checkpoint` machinery (`persist.c`) — extended, not replaced. +- `ha-term-safety`'s committed configuration-change marker (`config_committed_marker`, `WAL_CONFIG_MARKER`) — consumed as-is. +- The existing `snapshot_transfer_s` chunked install transport (`ha_handle_snapshot_chunk`) — reused as-is; this spec does not modify chunk transfer mechanics. +- The existing `config_serve_fence` pattern (`ha.h:307-322`, `config_repl.c:304-377`) — mirrored structurally for the new activation fence, not merged into the same field. +- The existing `lost_and_found` placeholder-worker precedent (`makeWorker()` without join, `config_repl.c:1114-1130`) — mirrored for host-frame restore. + +### Revalidation Triggers +- Any change to `apply_committed_entry`'s dispatch shape or to the fact that it is the single unified apply seam for all members (currently confirmed — `apply_wal_entry` has zero live callers) would require re-verifying the marker-apply hook still fires for every member. +- Any change to the on-disk snapshot header/frame layout (`SNAPSHOT_FORMAT_VERSION`) beyond this spec's own bump must re-check `snapverify`/`snapdiff`/this spec's config-bytes section for continued validity. +- Any change to `config_serve_fence`'s semantics or to `ha_dispatch_gate`'s composition order must re-check the new activation fence's placement alongside it. +- If `entity-bearing-snapshots`/`ha-entity-snapshots` ever changes its frame format, this spec's host/queue frame additions must be re-verified against the new format. + +## Architecture + +### Existing Architecture Analysis + +Three existing subsystems already do almost everything this feature needs; the actual new-work surface is narrow: + +1. **The apply seam is already unified.** `apply_committed_entry` (`persist.c:2751-3132`) is the single dispatch point for entity mutation on every member — primary online-apply (vtask-pool dispatched via `persist_apply_pump_kick`), standby normal apply (`ha_standby_advance_committed_and_apply`, heartbeat-learned commit position, since the 2026-07-10 commit-then-apply change), and boot/restart replay. `WAL_CONFIG_MARKER` currently falls into its generic `default:` no-op. The sibling dispatcher `apply_wal_entry` has zero live callers — fully superseded, not a second seam to worry about. +2. **The checkpoint/snapshot pipeline is already entity-bearing.** `write_snapshot`/`load_snapshot` (`persist.c`) already serialize job and queue frames at every checkpoint, guarded by a single-in-flight CAS (`checkpoint_in_progress`) and already stamping a config *reference* (`cfgref_tag`/`cfgref_sha`) via `scan_latest_committed_config_ref`. `persist_checkpoint()` is a plain, already-force-callable, synchronous function (a second direct call site already exists at `ha.c:3308`). +3. **The activation-fence pattern already exists for a materially identical problem.** `config_serve_fence` already gates client-request-serving (via `ha_dispatch_gate`) and promotion on a hash-verify condition, with a fully-wired non-blocking retry loop — this is a direct structural precedent for the gate 3.2/3.3 need, not a new pattern to invent. + +The upgrade path being retired (`do_upgrade_config_with_bytes` step 9, `config_repl.c:1753-1772`) already carries a NOTICE comment (`config_repl.c:1737-1751`) naming this exact spec and its target end-state — the maintainers who wrote the interim restart/replay path already anticipated this design. + +### Architecture Pattern & Boundary Map + +```mermaid +graph TB + Marker[WAL_CONFIG_MARKER committed] + Apply[apply_committed_entry] + Trigger[Forced checkpoint trigger] + Checkpoint[persist_checkpoint] + Snapshot[write_snapshot entity plus config bytes] + Fence[Upgrade materialization fence] + Gate[ha_dispatch_gate] + Promo[Promotion gate] + Transport[snapshot_transfer_s install] + Behind[Behind or joining member] + + Marker --> Apply + Apply --> Trigger + Trigger --> Checkpoint + Checkpoint --> Snapshot + Snapshot --> Fence + Fence --> Gate + Fence --> Promo + Behind --> Transport + Transport --> Fence +``` + +**Architecture Integration**: +- Selected pattern: extend the existing per-member apply-and-checkpoint pipeline in place; no new distribution/orchestration component. Each member independently materializes on its own apply of the marker (primary and standby alike, since both route through `apply_committed_entry`); a member that is behind receives the same entity-bearing snapshot through the existing generic catch-up transport, unrelated to upgrade-specific push logic. +- Domain/feature boundaries: persistence (`persist.c`) owns materialization and on-disk format; HA (`ha.c`/`ha.h`) owns the activation fence and dispatch-gate integration; config replication (`config_repl.c`) owns config-bytes sourcing and retiring the old restart path; worker/queue restore owns entity-specific create-vs-update semantics. +- Existing patterns preserved: single-in-flight checkpoint CAS, fail-loud format-version mismatch, never-self-terminate fence-and-retry, `#ifdef XCE_TESTING` fault-hook shape. +- New components rationale: a new `apply_committed_entry` case (nothing existed for this entry type); a new fence field (the existing one is logically a different condition); new capnp structs (existing ones bundle unwanted dynamic/static fields); a create-if-missing host restore path (queues' update-only assumption doesn't hold for hosts). +- Steering compliance: never blocks a vtask handler (the new checkpoint trigger runs inside `apply_committed_entry`'s own vtask-pool context, not on iomgr/delaymgr); never self-terminates (fence-and-retry, mirroring `config_serve_fence`). + +**Key simplification found during design**: 5.4 ("new leader resumes driving materialization and distribution") needs no new distribution-tracking state machine. Because every member independently materializes on its own apply of the marker (there is no primary-driven push loop — install is receiver-pulled via the existing generic catch-up mechanism), a new leader satisfies 5.4 automatically by continuing to apply its own committed log (which already includes the marker) — the same `apply_committed_entry` hook that handles this for any member handles it for a newly-elected one, with no leader-specific "resume" logic to write. + +### Technology Stack + +| Layer | Choice / Version | Role in Feature | Notes | +|-------|------------------|------------------|-------| +| Persistence / Serialization | Cap'n Proto (existing, `src/schema/controller.capnp`) | Encodes `HostAdminState`/`QueueAdminState` frames and embedded config bytes in the snapshot | Same library already used for `Job`/`Worker` messages; no version change | +| Backend / Runtime | C (gnu17), existing controller daemon | All new logic lives in `src/controller/` | No new language/runtime | +| Async I/O | Existing vtask pool / delaymgr (`ha-async-io.md`) | New checkpoint trigger runs on the existing apply-pump vtask worker; new fence retry mirrors `config_schedule_activate_retry`'s delaymgr→vtask trampoline | No new concurrency primitive | + +No new external dependency is introduced anywhere in this spec. + +## File Structure Plan + +### Modified Files +- `src/controller/persist.c` — new `case WAL_CONFIG_MARKER:` in `apply_committed_entry` (calls `persist_checkpoint` directly); `write_snapshot`/`load_snapshot`/`load_snapshot_entities` extended with a host-frame section and a config-bytes section; `collect_queue_frames`/queue-frame decode migrated from raw layout to `QueueAdminState` capnp; new `collect_host_frames`/`restore_host_state`; `SNAPSHOT_FORMAT_VERSION` bumped 1→2; new `#ifdef XCE_TESTING` fault hook for the marker-apply→checkpoint-durable window. +- `src/include/persist.h` — `SNAPSHOT_FORMAT_VERSION` bump declaration site (if defined here rather than persist.c); no new persistent fields needed beyond what already exists (`cfgref_*` reused for the reference; the embedded bytes are read fresh from disk at write time via `myconf`'s own fields, not cached on `persist_t` — see the config_repl.c bullet below for why this avoids a new cross-module call). +- `src/controller/ha.h` — new `_Atomic int upgrade_materialization_fence` field on `ha_state_t` (sibling to `config_serve_fence`, `ha.h:307-322`); new accessor declaration. +- `src/controller/ha.c` — new `upgrade_materialization_verify()` (mirrors `config_activate_committed`'s hash-verify-then-set/clear shape); new accessor `upgrade_materialization_fenced()`; `ha_dispatch_gate`'s `CTRL_PRIMARY` branch extended with the new fence check (composed alongside, not merged with, `config_serve_fenced()`); promotion gate (`ha.c:1425` area) extended the same way `config_serve_fenced()` already gates it; new `schedule_upgrade_materialization_retry()` mirroring `config_schedule_activate_retry`'s trampoline. +- `src/controller/config_repl.c` — `do_upgrade_config_with_bytes` step 9 (`config_repl.c:1753-1772`, restart_requested/cbuf_put) removed; the NOTICE comment (`config_repl.c:1737-1751`) replaced with a short comment pointing at the new `apply_committed_entry` case; **no new accessor function added here** — `persist.c`'s snapshot writer reads the active config bytes directly off disk via `p->cluster->myconf->workdir`/`myconf->name` (plain struct fields on the shared, public `cluster_t`/`myconf_t`, `cluster_def.h`/`myconf.h`), the same `workdir/name/conf` path `conf_save_config` (`config_repl.c:776`) already writes to — this deliberately mirrors `scan_latest_committed_config_ref`'s own existing precedent of avoiding a `persist.c → config_repl.c` function-call dependency (that function's comment states this explicitly), rather than introducing the layering violation a new accessor would create; new `#ifdef XCE_TESTING` fault hook for the leadership-change-mid-distribution window, mirroring `xce_snapshot_chunk_hook`'s shape. +- `src/controller/worker.c` — new `restore_host_state(cluster_t*, const char*, uint32_t admin_status)`: create-if-missing via a small `makeWorker()`-based placeholder helper (valid non-NULL `hostattrs_t`, mirroring the `lost_and_found` precedent in `config_repl.c:1114-1130`), idempotent (look up first, only create if missing, OR-in admin bits either way — 5.8). +- `src/controller/queue.c` — no signature change to `restore_queue_state`; only its caller's decode step (in `persist.c`) changes from raw-layout parsing to `QueueAdminState` capnp decode. +- `src/schema/controller.capnp` — new `struct HostAdminState { name @0: Text; status @1: UInt32; }` and `struct QueueAdminState { name @0: Text; status @1: UInt32; }`. +- `.claude/skills/xce-test-ha/run-ha-soak.sh` — extended with a new scenario covering config upgrade interleaved with chaotic multi-kill failover (requirement 6) and back-to-back overlapping upgrades (7.2); exact flag/mode naming left to tasks.md. + +### New Files +- `src/controller/testsuite/test_upgrade_snapshot_apply.c` — bare in-memory `cluster_t` fixture (mirrors `test_apply_committed_entry.c`'s pattern), drives the new `WAL_CONFIG_MARKER` case directly, asserts a forced checkpoint fires exactly once and is idempotent under retry. +- `src/controller/testsuite/test_upgrade_snapshot_restore.c` — disk-backed fixture (mirrors `test_replay_apply_seam.c`'s pattern), covers host-placeholder creation, later real-join-through-`rejoin_worker` admin-bit preservation, and idempotent retry of a partially-failed restore. +- `src/controller/testsuite/test_upgrade_activation_fence.c` — exercises `upgrade_materialization_verify`, the dispatch-gate composition, the promotion-gate composition, and the retry trampoline. +- `src/controller/testsuite/configcompare.c` / `configcompare.h` — new sibling tool to `walcompare` (not an extension of it — `walcompare`'s internal model is WAL-entry-indexed `(lsn → term, pcrc)`; active-configuration identity across members is a single `(tag, sha)` per member with no LSN dimension, an awkward fit for `walcompare`'s report shape). **Offline/file-based, mirroring `snapdiff_paths`'s exact signature shape**: `int configcompare_paths(const char* const* conf_paths, int n, FILE* out, configcompare_report_t* rep)`, each path being a member's `workdir/name/conf` file (the same path this spec's snapshot-embed step reads, so both consumers agree on where a member's active config lives) — no live RPC to each cluster member, consistent with every other tool in this family. Compares each member's config content hash (recomputed from the file bytes, not trusted from a cached tag) for 4.2, usable directly by the HA soak scenario against each node's own data directory. +- `src/controller/testsuite/snapverify.c` (modified, not new) — extended to decode and assert `cfgref_tag`/`cfgref_sha` (not just presence), and to report host-frame count and config-bytes-section presence. + +## System Flows + +```mermaid +sequenceDiagram + participant Admin + participant Primary + participant Standby + participant ApplySeam as apply_committed_entry + participant Checkpoint as persist_checkpoint + participant Fence as Activation Fence + + Admin->>Primary: upgrade-config request + Primary->>Primary: config_commit_change (append+commit marker) + Primary->>Standby: replicate WAL_CONFIG_MARKER + par Primary applies + Primary->>ApplySeam: apply marker (own apply pump) + ApplySeam->>Checkpoint: trigger forced checkpoint at marker (term,lsn) + Checkpoint->>Fence: verify hash, clear fence + and Standby applies + Standby->>ApplySeam: apply marker (heartbeat-learned commit) + ApplySeam->>Checkpoint: trigger forced checkpoint at marker (term,lsn) + Checkpoint->>Fence: verify hash, clear fence + end + Fence-->>Primary: serve under new configuration +``` + +**Key decisions visible above**: no primary-orchestrated push step exists — both members reach the same materialized-and-verified state independently through the same seam, which is what makes leadership change mid-upgrade (5.4) self-resolving rather than requiring resume logic. + +```mermaid +stateDiagram-v2 + [*] --> Fenced: marker applied, materialization not yet verified + Fenced --> Fenced: hash mismatch or materialization incomplete, retry via delaymgr trampoline + Fenced --> Verified: hash-verify succeeds against current marker + Verified --> [*]: fence cleared, serving and promotion allowed +``` + +## Requirements Traceability + +| Requirement | Summary | Components | Interfaces | Flows | +|---|---|---|---|---| +| 1.1 | Materialize at marker apply, not commit | `apply_committed_entry` new case | `persist_checkpoint` | Sequence diagram | +| 1.2 | Every member ends up holding the snapshot | Per-member apply seam + existing transport | `ha_handle_snapshot_chunk` (reused) | Sequence diagram | +| 1.3 | No member re-derives via replay | `do_upgrade_config_with_bytes` step 9 removed | — | — | +| 1.4 | Transfer out-of-band, not in WAL | Existing `snapshot_transfer_s` (reused) | — | — | +| 1.5 | Synchronous, non-blocking trigger | New `apply_committed_entry` case calling `persist_checkpoint` directly | — | Sequence diagram | +| 1.6 | Host admin-status in snapshot | `collect_host_frames`/`HostAdminState` | capnp struct | — | +| 1.7 | Exclude dynamic host metrics | `collect_host_frames` field selection | — | — | +| 1.8 | Apply does not itself re-home entities | Existing `lost_and_found` re-homing untouched; apply vs activation separation | Activation Fence | State diagram | +| 1.9 | Host/queue frames extensible (capnp) | `HostAdminState`/`QueueAdminState` | `controller.capnp` | — | +| 1.10 | Create-if-missing host placeholder | `restore_host_state` | `makeWorker()`-based helper | — | +| 1.11 | Real join routes through `rejoin_worker` | `restore_host_state` placeholder + existing `join.c` dispatch (unchanged) | `rejoin_worker` (reused) | — | +| 2.1 | Config embedded in snapshot | New config-bytes section in `write_snapshot` | `p->cluster->myconf` direct read | — | +| 2.2 | Supersede R7 interim byte-push for upgrades | `do_upgrade_config_with_bytes` retirement | — | — | +| 2.3 | Config bytes out of WAL | Unchanged (`WAL_CONFIG_MARKER` already `{tag,sha}` only) | — | — | +| 2.4 | Every checkpoint embeds current config | Config-bytes section added to every `write_snapshot` call, not just marker-triggered | — | — | +| 3.1 | No new promotion-eligibility mechanism | Existing Raft log-freshness gate (unchanged) | — | — | +| 3.2 | Gate serving until materialization+hash-verify | Activation Fence | `ha_dispatch_gate` | State diagram | +| 3.3 | Keep serving under last-verified config while incomplete | Activation Fence (allowlist composition) | `ha_dispatch_gate` | State diagram | +| 3.4 | Hash mismatch keeps serving/fences, retries | `upgrade_materialization_verify` | `schedule_upgrade_materialization_retry` | State diagram | +| 4.1 | Every member's materialized state identical | Per-member apply seam + `snapdiff_paths` (test) | — | Sequence diagram | +| 4.2 | Every member's active config identical | New `configcompare` tool | `configcompare_paths` | — | +| 4.3 | Invariant holds across upgrade x failover | Activation Fence + existing promotion gate composition | — | — | +| 4.4 | Overlapping upgrades supersede cleanly | Per-marker deterministic content (5.1) + fence re-verify on newer marker | — | — | +| 5.1 | Deterministic snapshot content | `write_snapshot` keyed on `(term,lsn,config-hash)` | `snapdiff_paths` (test) | — | +| 5.2 | Crash before durable write resumes from marker | Existing `checkpoint_in_progress` CAS + apply-pump re-apply on restart | — | — | +| 5.3 | Forced checkpoint shares single-in-flight guard | `checkpoint_in_progress` CAS (reused) | `persist_checkpoint` | — | +| 5.4 | Leadership change resumes materialization | Per-member apply seam (see Key simplification) | — | Sequence diagram | +| 5.5 | Never serve without durable+verified snapshot | Activation Fence | `ha_dispatch_gate`, promotion gate | State diagram | +| 5.6 | Rolling-binary-upgrade format skew fail-loud | Existing `fmt != SNAPSHOT_FORMAT_VERSION` hard-reject (reused) | — | — | +| 5.7 | Old raw queue-frame layout rejected fail-loud | `SNAPSHOT_FORMAT_VERSION` bump 1→2 | — | — | +| 5.8 | Idempotent retry of placeholder host restore | `restore_host_state` (find-before-create) | — | — | +| 6.1 | Chaotic upgrade+failover: identical state/config | HA soak new scenario | `configcompare`, `snapdiff_paths` | — | +| 6.2 | Reproduce bug-857 on old code, pass on new | `test_bug857_regression.c` (unit-level, `controller_unit_test`) — see correction note below | `snapdiff_paths` | — | +| 6.3 | Inject crash/leadership-change at marker-to-install window | New fault hooks (`persist.c`, `config_repl.c`) | — | — | +| 6.4 | Host admin-status explicitly asserted post-upgrade+failover | HA soak new scenario assertion | — | — | +| 7.1 | Placeholder-then-rejoin admin status preserved | `test_upgrade_snapshot_restore.c` | `restore_host_state`, `rejoin_worker` | — | +| 7.2 | Overlapping upgrades cleanly superseded | HA soak new scenario | — | — | +| 7.3 | Format-mismatch fail-loud (rolling upgrade + queue-layout) | `test_upgrade_snapshot_apply.c` / manual format-mismatch fixture | — | — | +| 7.4 | Marker-triggered checkpoint's WAL trim does not strand a mid-catch-up standby | `test_upgrade_snapshot_apply.c` extended + HA soak new scenario | `trim_wal_segments`, `repl_trim_lsn` (reused, unmodified) | — | + +**Correction to row 6.2 (task 8.5, post-implementation):** this row originally assigned Requirement 6.2 to "HA soak new scenario," under the same bug-857 mechanism hypothesis as the buglog entry — "config-push + restart + per-node WAL replay, config-dependent via `lost_and_found`." Task 8.5's investigation found that mechanism was never implemented as code, on any commit: `create_lost_and_found` (config_repl.c) only ever creates the sentinel `lost_and_found` queue/host objects; no code path in `job.c`/`queue.c`/`worker.c` ever reassigns an EXISTING job's queue reference onto them (`restore_job`/`restore_job_array` never consult `c->qmgr`; `restore_queue_state` explicitly skips — returns `-ENOENT` — rather than re-homes when a queue is absent). `create_lost_and_found`'s body is also unconditionally `#ifndef XCE_TESTING`'d out. The buglog's own bug-857 entry already flagged this as "NOT empirically reproduced yet" — the re-homing detail was TLA+-derived aspiration, not observed behavior. + +The real, code-backed mechanism 6.2 reproduces instead is **checkpoint-content divergence from marker-vs-threshold decoupling**: pre-task-5, `apply_committed_entry`'s `WAL_CONFIG_MARKER` case was the generic no-op `default:` case, so a checkpoint's LSN/content was determined solely by `schedule_checkpoint`'s independent per-member WAL-record-count threshold — completely decoupled from the config-change marker's position in the shared committed log. Two members reaching that threshold at different real-world moments (ordinary job-submission activity interleaved around the upgrade) materialize genuinely different job/queue content, with neither checkpoint anchored to the marker — exactly "no snapshot pinning an identical post-upgrade state" (bug-857's own root-cause wording). Post-task-5, the marker-triggered checkpoint fires synchronously, inline, the instant the marker entry is dispatched, anchoring every member to identical content regardless of processing pace. + +This mechanism is fully reproducible at the `controller_unit_test` level (no `cluster.c`/live-multi-process linkage needed), so 6.2 was moved off the "HA soak new scenario" assignment onto `testsuite/test_bug857_regression.c` — a two-scenario regression (threshold-triggered divergence pre-fix; marker-triggered convergence post-fix, verified via `snapdiff_paths` byte-identity) landed entirely within this one file. Requirement 6.1's full live chaotic-soak-with-upgrade (task 8.6, not yet started) remains the legitimate home for live multi-process testing of the broader upgrade+failover interaction — it will need to build live config-upgrade-trigger infrastructure regardless of what 8.5 did, so nothing is lost by 8.5 staying at the unit level. Not rewriting the original row's history — see task 8.5's Status Report for the full investigation trail. + +## Components and Interfaces + +| Component | Domain/Layer | Intent | Req Coverage | Key Dependencies (P0/P1) | Contracts | +|---|---|---|---|---|---| +| Marker Apply Trigger | Persistence (`persist.c`) | Fire a forced checkpoint synchronously when `WAL_CONFIG_MARKER` is applied | 1.1, 1.5, 1.8, 7.4 | `persist_checkpoint` (P0), `checkpoint_in_progress` CAS (P0) | State | +| Snapshot Entity/Config Payload | Persistence (`persist.c`) | Embed host/queue admin frames (capnp) and config bytes in every checkpoint | 1.6, 1.7, 1.9, 2.1, 2.4, 5.1, 5.7 | `HostAdminState`/`QueueAdminState` capnp (P0), `myconf` fields (P0, direct read) | State | +| Host Restore (create-if-missing) | Worker/Restore (`worker.c`) | Restore a host admin-state frame safely whether or not the host has ever joined | 1.10, 1.11, 5.8 | `makeWorker` (P0), `rejoin_worker` (P0, unmodified) | Service | +| Activation Fence | HA (`ha.c`/`ha.h`) | Gate primary serving and promotion on this member's own materialization-and-hash-verify | 1.8, 3.2, 3.3, 3.4, 4.3, 5.5 | `ha_dispatch_gate` (P0), promotion gate (P0), `config_serve_fence` pattern (P1, mirrored not shared) | State | +| Upgrade Path Retirement | Config Replication (`config_repl.c`) | Remove the restart/replay fallback now superseded by the Marker Apply Trigger | 1.2, 1.3, 1.4, 2.2, 5.4 | Marker Apply Trigger (P0) | — | +| Regression Tooling | Testsuite | New fault hooks, `configcompare`, extended `snapverify`, HA soak scenarios | 4.2, 6.1-6.4, 7.1-7.4 | All above (P0) | Batch | + +### Persistence (`persist.c`) + +#### Marker Apply Trigger + +| Field | Detail | +|---|---| +| Intent | Add the missing `WAL_CONFIG_MARKER` case to the single unified apply seam so every member materializes at the marker boundary | +| Requirements | 1.1, 1.5, 1.8, 7.4 | + +**Responsibilities & Constraints** +- Carve a new explicit `case WAL_CONFIG_MARKER:` out of `apply_committed_entry`'s current `default:` no-op. +- Call `persist_checkpoint()` directly — safe because `apply_committed_entry` already runs on the apply-pump's own vtask-pool worker, never the iomgr/delaymgr thread; no further async hand-off is needed at this call site (unlike `schedule_checkpoint`'s WAL-threshold trigger, which fires from arbitrary vtask handlers and genuinely needs delaymgr's non-blocking return). +- Must NOT change how entities are interpreted/re-homed (`lost_and_found`) — that remains the activation step's concern (1.8), never a side effect of apply. +- `apply_wal_entry`'s matching `default:` case is left untouched — it has zero live callers; adding symmetry there would be speculative, unjustified work (Design Invariant 5 / Simplification lens). + +**Dependencies** +- Inbound: apply pump (`persist_apply_pump_run`) and boot replay (P0) +- Outbound: `persist_checkpoint` (P0) — already tolerates `-EBUSY` from a concurrent scheduled checkpoint via the shared `checkpoint_in_progress` CAS +- Outbound: new `#ifdef XCE_TESTING` fault hook, mirroring `ha_stream_body_read_fault_hook`'s shape, for 6.3 and 7.3's deterministic marker-to-checkpoint-durable injection + +**Contracts**: State [x] + +##### State Management +- State model: `checkpoint_lsn` is pinned to `last_applied_lsn` inside `persist_checkpoint` — since this case runs exactly when the marker is applied, `checkpoint_lsn` naturally equals the marker's own LSN with no new LSN-targeting parameter needed. +- Persistence & consistency: guarded by the existing `checkpoint_in_progress` CAS; a concurrent WAL-threshold-triggered checkpoint and this marker-triggered one cannot both proceed simultaneously. +- Concurrency strategy: runs to completion on the calling vtask-pool worker; no new thread or lane. + +**Implementation Notes** +- Integration: one new `case` label plus one function call; `do_upgrade_config_with_bytes` step 9 becomes dead code and is removed in the same change (Upgrade Path Retirement, below). +- Validation: `test_upgrade_snapshot_apply.c` asserts the checkpoint fires exactly once per marker apply and is safe under a forced retry (idempotent — a second apply of an already-applied marker, e.g. during replay, must not double-checkpoint incorrectly; `checkpoint_lsn` monotonicity already guards this at the `persist_checkpoint` level). +- Risks: the narrow window between `schedule_checkpoint`'s CAS release and `persist_checkpoint`'s own re-acquire (pre-existing, `persist.c:2222`/`2265`) now has a second caller; not a new race class, but worth a regression assertion that a marker-triggered and WAL-threshold-triggered checkpoint racing each other never corrupts the snapshot (covered by the existing CAS, asserted for completeness). +- **Overlapping-marker `-EBUSY` handling (4.4, 7.2)**: if a second `WAL_CONFIG_MARKER` is applied while an earlier marker's forced checkpoint is still in flight, this case's `persist_checkpoint()` call returns `-EBUSY` — this is NOT an error to surface or retry specially. The in-flight checkpoint (for the older marker) completes on its own, and the Activation Fence's own verify step (which re-reads the *latest committed* marker, not whichever one triggered the checkpoint) naturally re-evaluates against the newer marker once that checkpoint's `write_snapshot` call runs — either from the older checkpoint's own completion re-triggering a fresh comparison, or from the newer marker's normal WAL-threshold checkpoint eventually firing. No special retry loop is added at this call site for `-EBUSY`; it is logged at `TRACE`, not `WARN`/`ERROR`, since it is an expected, self-resolving outcome, not a failure. +- **Trim safety under the new trigger path (7.4)**: `persist_checkpoint()` (this case's own call) already runs `trim_wal_segments` afterward, unchanged — the retention-floor guard (`repl_trim_lsn`, bug-1147: floor = min(active segment LSN, every connected standby's acked LSN, every recently-disconnected slot's last-disconnected LSN)) is not modified by this spec, only invoked from a new trigger point. Six existing tests (`test_checkpoint_wal_trim_after_checkpoint`, `test_trim_guard_preserves_standby_segments`, `test_trim_without_standbys_proceeds_normally`, `test_repl_trim_lsn_no_standbys`, `test_repl_trim_lsn_disconnected_slot_expiry`, `test_trim_lsn_with_active_standby_at_lsn_5`) already cover this guard through the periodic WAL-threshold trigger — none exercise it through this new marker-triggered path, or under the chaotic multi-kill conditions Requirement 6 exercises, which is a real coverage gap this spec must close, not assume covered by proxy. + +#### Snapshot Entity/Config Payload + +| Field | Detail | +|---|---| +| Intent | Extend the on-disk checkpoint format with host admin-state frames, migrate queue frames to capnp, and embed full configuration bytes | +| Requirements | 1.6, 1.7, 1.9, 2.1, 2.4, 5.1, 5.7 | + +**Responsibilities & Constraints** +- `collect_host_frames`: walk `c->workermgr` with the same lock/iterate idiom `collect_job_frames`/`collect_queue_frames` already use; encode only `w->host.status & XCE_WORKER_ADMIN_MASK` per host as a `HostAdminState` capnp frame — never the full `xce_worker_t` (excludes `resvals_to_sched`, `dead_since`, dynamic status bits, per 1.7). +- `collect_queue_frames`: migrated to emit `QueueAdminState` capnp frames instead of the current raw `{name_len, name, status}` layout — same field selection (name + status), new wire encoding only. +- Config-bytes section: `write_snapshot` reads the locally-held active configuration bytes directly off disk via `p->cluster->myconf->workdir`/`myconf->name` (the same `workdir/name/conf` path `conf_save_config` writes, and the same bytes `config_activate_committed` already hash-verifies), appended after the host frames. No new `config_repl.c` function is added for this — see the File Structure Plan note on why (mirrors `scan_latest_committed_config_ref`'s existing avoid-a-config_repl-dependency precedent). +- `SNAPSHOT_FORMAT_VERSION` bumps 1→2 — this is a genuine breaking layout change (queue frames change shape), so the existing fail-loud version-mismatch behavior (`load_snapshot`, `fmt != SNAPSHOT_FORMAT_VERSION → -EINVAL`) applies unchanged; no compatibility shim is added (Design Invariant 4). +- Determinism (5.1): content is a pure function of `(term, lsn, config-hash)` — independent materialization by any member (including a newly-elected leader) must be byte-identical, verified via `snapdiff_paths`. + +**Dependencies** +- Inbound: Marker Apply Trigger (P0, calls `persist_checkpoint` which calls `write_snapshot`); periodic WAL-threshold checkpoint (P0, same `write_snapshot` gets the same new sections on every checkpoint per 2.4) +- Outbound: `controller.capnp`'s new `HostAdminState`/`QueueAdminState` structs (P0) +- Outbound: `p->cluster->myconf` fields (P0, plain struct-field read on the shared `cluster_t`/`myconf_t` — not a `config_repl.c` function call, preserving the existing layering precedent) + +**Contracts**: State [x] + +##### State Management +- State model: additive frame sections after the existing job/queue frames; config-bytes section is new, appended last. +- Persistence & consistency: same single-commit-point discipline `load_snapshot` already enforces (restore fully, THEN advance position; a partial restore leaves `persist_t`'s fields untouched). +- Concurrency strategy: unchanged — collection happens under the same table read-locks already used, no new locking model. + +**Implementation Notes** +- Integration: `HostAdminState`/`QueueAdminState` capnp structs added to `controller.capnp`; regenerate bindings. +- Validation: `snapverify` extended to decode/assert `cfgref_tag`/`cfgref_sha` (not just presence) and report host-frame count and config-bytes-section presence; `snapdiff_paths` used as-is for the determinism check. +- Risks: none new beyond the format-version bump's inherent one-time old-snapshot invalidation, already an accepted, existing pattern. + +### Worker/Restore (`worker.c`) + +#### Host Restore (create-if-missing) + +| Field | Detail | +|---|---| +| Intent | Restore a host admin-state frame correctly whether the target host has ever joined on this member or not | +| Requirements | 1.10, 1.11, 5.8 | + +**Responsibilities & Constraints** +- Classify hosts as join-provisioned (not config-provisioned, unlike queues): `key_find(c->workermgr, name)` may legitimately miss for a member receiving the snapshot via the out-of-band install path, since that is precisely the "hasn't locally replayed this host's join record yet" case. +- On miss: create a minimal placeholder via `makeWorker()` with a valid, non-NULL `hostattrs_t` (even if minimal/zeroed) — mirroring the `lost_and_found` sentinel host precedent exactly, not a new mechanism. A NULL/absent `attrs` here would crash `rejoin_worker`'s later direct dereference on the first real join (1.11) — this is the one hard implementation constraint carried over from discovery. +- On hit (placeholder or previously-joined real host): OR-in the restored admin-status bits, same as today's behavior. +- Idempotency (5.8): a retried restore after a partial failure must find the already-created placeholder and update it, never treat its existence as a create conflict — `key_find`-then-create-or-update already gives this for free as long as the create step itself is the only thing guarded (i.e., find-first, not create-first-then-handle-EEXIST). +- The later real join is NOT this component's concern: `join.c`'s existing `key_find`-based dispatch (found `w != NULL` → `rejoin_worker`, else → `init_worker`) already routes a real join against an existing placeholder through `rejoin_worker`, which already preserves admin bits (`worker.c:374,390`) — no change needed there. + +**Dependencies** +- Inbound: Snapshot Entity/Config Payload's restore path (P0, calls this per host frame) +- Outbound: `makeWorker` (P0, existing) +- Outbound: `rejoin_worker` (P0, existing, unmodified — the later real join's correctness depends on this component creating a valid placeholder, not on any change to `rejoin_worker` itself) + +**Contracts**: Service [x] + +##### Service Interface +```c +int restore_host_state(cluster_t* c, const char* name, uint32_t admin_status); +``` +- Preconditions: `name` non-empty; `c->workermgr` initialized. +- Postconditions: a `worker_t` named `name` exists in `c->workermgr` with `host.status` including `admin_status`'s bits; if newly created, `host.attrs` is non-NULL and heap-owned (via `makeWorker`'s underlying `copy_worker` deep-copy). +- Invariants: never destroys a pre-existing worker's non-admin state; never leaves a partially-constructed placeholder on any error path (mirrors the existing collect/restore all-or-nothing discipline). + +**Implementation Notes** +- Integration: called from `persist.c`'s host-frame restore loop, one call per frame. +- Validation: `test_upgrade_snapshot_restore.c` covers create-then-later-real-join (asserting admin status survives through `rejoin_worker`), and retry-after-partial-failure (asserting no duplicate/conflict). +- Risks: none beyond the `attrs`-non-NULL constraint already called out — mitigated by construction (always pass a valid, even if zeroed, `hostattrs_t` to `makeWorker`). + +### HA (`ha.c`/`ha.h`) + +#### Activation Fence + +| Field | Detail | +|---|---| +| Intent | Never let a member serve client requests or become primary under a configuration whose upgrade-snapshot materialization it has not itself completed and hash-verified | +| Requirements | 1.8, 3.2, 3.3, 3.4, 4.3, 5.5 | + +**Responsibilities & Constraints** +- A new, independent atomic fence field on `ha_state_t` — NOT merged into `config_serve_fence`, since the two conditions are logically distinct (byte-mismatch vs. materialization-incomplete) and 3.4 needs to distinguish "keep serving under last-verified configuration" from "no verified configuration exists yet," which requires knowing which fence is active. +- Verify function mirrors `config_activate_committed`'s exact shape: read the current committed marker, compare against this member's own materialized-and-hash-verified state for that marker; set the fence and log loud on mismatch/incomplete, clear it on success — never `exit`/`abort` (`controller/CLAUDE.md`'s never-self-terminate invariant). +- **Verify against LIVE on-disk config bytes each attempt, never a frozen snapshot's embedded copy.** The WAL marker's raft-commit and the R7 config-bytes push (`push_config_to_standbys`/`handle_repl_config_push`) are two independent channels with no strict ordering guarantee between them — a member could apply the marker and trigger its forced checkpoint before its own `workdir/name/conf` reflects the pushed bytes, meaning the snapshot's embedded config section could be momentarily stale. This is not a correctness risk (a stale embed is just one more mismatch the hash-verify catches, same as any other), but it IS a liveness trap if the verify function checks the snapshot's frozen embed instead of re-reading current disk bytes fresh on every retry — `config_activate_committed` already gets this right (recomputes the hash from current bytes each call, `config_repl.c:275-302`, never from a cached/frozen copy), and this new verify function must do the same, or the fence could stay stuck until the next unrelated periodic checkpoint happens to re-embed fresher bytes. +- Composed into `ha_dispatch_gate`'s `CTRL_PRIMARY` branch the same way `config_serve_fenced()` already is — a sequential additional check with its own allowlist (replication + read-only ops stay admitted), not a merge into the existing check's logic. +- Also gates promotion, the same way `config_serve_fenced()`/`ha_config_promotion_fenced()` already do — a member whose own materialization is incomplete must not become primary and immediately fail 3.2 the moment it wins an election. +- Self-clearing retry: a new `schedule_upgrade_materialization_retry()` mirroring `config_schedule_activate_retry`'s delaymgr-trampoline-then-vtask shape exactly — non-blocking trigger, blocking verify work done off the delaymgr thread. + +**Dependencies** +- Inbound: Marker Apply Trigger (P0, clears the fence once materialization+hash-verify succeeds) +- Outbound: `ha_dispatch_gate` (P0, existing, extended) +- Outbound: promotion gate (P0, existing, extended) +- Outbound: `config_schedule_activate_retry`'s trampoline pattern (P1, mirrored, not shared code) + +**Contracts**: State [x] + +##### State Management +- State model: two states per member — fenced (materialization incomplete or hash-mismatched for the current marker) and verified (cleared). +- Persistence & consistency: in-memory only, re-derived on restart from the actual on-disk snapshot state vs. the current committed marker (no separate durable flag needed — the fence is a function of comparing two already-durable facts). +- Concurrency strategy: same single-writer-plus-atomic-read pattern `config_serve_fence` already uses. + +**Implementation Notes** +- Integration: one new field, one new verify function, one new accessor, two call-site additions (dispatch gate, promotion gate), one new retry trampoline. +- Validation: `test_upgrade_activation_fence.c` covers fence-set-on-incomplete-materialization, fence-clear-on-verify-success, dispatch-gate allowlist behavior while fenced, and promotion refusal while fenced. +- Risks: none beyond what the mirrored `config_serve_fence` pattern already carries in production today. + +### Config Replication (`config_repl.c`) + +#### Upgrade Path Retirement + +| Field | Detail | +|---|---| +| Intent | Remove the now-superseded restart/per-node-replay fallback | +| Requirements | 1.2, 1.3, 1.4, 2.2, 5.4 | + +**Responsibilities & Constraints** +- Delete `do_upgrade_config_with_bytes` step 9 (`restart_requested`/`cbuf_put`) — materialization is now driven entirely by the Marker Apply Trigger, decoupled from this request-handling function entirely; the function's job now ends at step 8 (ACK the admin tool once the marker+bytes are majority-committed). +- Replace the NOTICE comment naming this spec with a short pointer at the new `apply_committed_entry` case, so the historical context isn't lost. +- No new distribution-tracking logic is added here (see Architecture's "Key simplification found during design") — 5.4 is satisfied by the per-member apply model, not by anything this function does. + +**Dependencies** +- Inbound: none (this is a deletion, not a new caller) +- Outbound: Marker Apply Trigger (P0) now owns what this code used to trigger via restart + +**Contracts**: none (behavioral removal) + +**Implementation Notes** +- Integration: this change and the Marker Apply Trigger must land together — deleting step 9 without the new case first would silently leave the marker with no materialization trigger at all (a real ordering dependency for tasks.md to sequence correctly). +- Validation: the bug-857 regression (6.2) exercises this path directly — reproduces divergence on the pre-change code (restart+replay), passes on the post-change code (no restart, synchronous materialization). +- Risks: none new; this is strictly subtractive once the replacement is proven. + +## Data Models + +### Logical Data Model + +**Checkpoint file layout (on-disk), `SNAPSHOT_FORMAT_VERSION = 2`**: +1. Legacy sentinel header (unchanged): magic `"XCESNAP\0"` (8 bytes) + `checkpoint_lsn` (8 bytes) + config-ref tail (`present`/`tag`/`sha`, 41 bytes). +2. `format_version` (4 bytes) — now `2`. +3. Job frames (unchanged): `job_count` + per-job `[payload_len][capnp Job bytes]`. +4. Queue frames (changed): `queue_count` + per-queue `[payload_len][capnp QueueAdminState bytes]` — was `[name_len][name][status]` raw. +5. Host frames (new): `host_count` + per-host `[payload_len][capnp HostAdminState bytes]`. +6. Config-bytes section (new): `config_bytes_len` + raw config bytes (the same bytes `config_activate_committed` hash-verifies against the marker's sha256). + +**Referential integrity**: restore order (job → queue → host) does not matter functionally — re-homing decisions (`lost_and_found`) are already baked into each entity's encoded content at materialization time, never re-derived at restore time (Design Invariant 2). + +**Versioning**: the `format_version` field is the sole discriminator; any mismatch is a hard fail-loud reject (`-EINVAL`), consistent with the existing, deliberate no-silent-reinterpretation policy. A short file (nothing past the legacy header) is still detected as a pre-entity-bearing legacy checkpoint, unchanged from today. + +## Error Handling + +### Error Strategy +Every new failure path follows the codebase's existing convention: fail loud (log the actionable boundary), never `exit`/`abort` on an operational condition, stay alive, keep retrying when self-healing is possible. + +### Error Categories and Responses +- **Format-version mismatch** (rolling binary upgrade skew on snapshot-install, or an old raw-queue-frame snapshot post-migration): hard reject, no partial install, no silent reinterpretation — reuses the existing `fmt != SNAPSHOT_FORMAT_VERSION` path unchanged. +- **Hash-verify mismatch** (embedded config bytes don't match the marker's sha256, or materialization incomplete): Activation Fence sets, member keeps serving under its last-verified configuration (or a loud non-serving fence if none exists yet), retries via the delaymgr trampoline — never activates mismatched configuration. +- **Host placeholder creation failure** (`makeWorker` allocation failure): treated as any other collect/restore failure today — discard partial state, fail the checkpoint/restore attempt, retriable on the next cycle; never a crash. +- **Overlapping upgrades** (a second marker commits before the first's distribution completes): the newer marker's materialization supersedes the older one's in-flight state cleanly, since content is a deterministic function of `(term, lsn, config-hash)` — an in-progress older materialization simply becomes moot, not corrupting, once the newer one completes. + +### Monitoring +Reuses existing structured-log conventions (`INFO`/`WARN`/`ERROR` per the codebase's HA logging pattern) — a loud `ERROR` on fence-set (naming the marker's `(term,lsn)` and the mismatch reason), `INFO` on fence-clear, matching `config_serve_fence`'s existing log shape. + +## Testing Strategy + +- **Unit Tests** (`test_upgrade_snapshot_apply.c`): `WAL_CONFIG_MARKER` case fires a checkpoint exactly once per apply (1.1, 1.5); idempotent under a forced retry (5.2, 5.3); does not itself re-home entities (1.8). +- **Unit Tests** (`test_upgrade_snapshot_restore.c`): host-frame create-if-missing via placeholder (1.10); admin status survives through a later real join via `rejoin_worker` (1.11); idempotent retry after partial failure (5.8). +- **Unit Tests** (`test_upgrade_activation_fence.c`): fence set/clear on hash-verify outcome (3.2, 3.4); dispatch-gate allowlist while fenced (3.3); promotion refusal while fenced (4.3, 5.5). +- **Integration Tests**: `snapdiff_paths` determinism check — two independent materializations at the same `(term, lsn, config-hash)` boundary are byte-identical (5.1). `configcompare` cross-member active-config identity (4.2). Extended `snapverify` decodes/asserts the embedded config-ref tag/hash and reports host-frame/config-bytes-section presence. bug-857 reproduction (6.2) — see the Requirements Traceability table row and the correction note above this section: reassigned off "E2E / HA soak" to `test_bug857_regression.c`, a unit-level demonstration that `schedule_checkpoint`'s pre-existing WAL-threshold trigger (decoupled from the config-marker boundary) diverges two members' checkpoint content, and that the marker-triggered checkpoint added by this spec converges them regardless of per-member processing pace. +- **E2E / HA soak** (`.claude/skills/xce-test-ha`): config upgrade interleaved with chaotic multi-kill failover, asserting identical materialized state and active config across all members afterward, including host admin-status specifically (6.1, 6.4); deterministic fault injection at the marker-apply→checkpoint-durable window and the leadership-change-mid-distribution window via the two new `#ifdef XCE_TESTING` hooks, rather than relying on chaotic-soak timing probability (6.3); overlapping/back-to-back upgrades before the first's distribution completes, asserting clean supersession (4.4, 7.2); host admin-status change issued while the host is down, followed by an upgrade snapshot restore on a member with no local join record, followed by the host's real first join, asserting preservation end-to-end (7.1); format-mismatch fail-loud for both rolling-binary-upgrade skew and the old raw-queue-frame layout (5.6, 5.7, 7.3); a standby held genuinely mid-catch-up (its acked LSN behind the marker's) while the marker-triggered checkpoint's WAL trim runs, asserting its still-needed segments are not stranded — extending `test_upgrade_snapshot_apply.c` with a fixture mirroring `test_trim_guard_preserves_standby_segments`'s existing pattern but driven through the new marker-apply case, plus one HA soak assertion under chaotic conditions specifically (7.4). + +## Migration Strategy + +A single `SNAPSHOT_FORMAT_VERSION` bump (1→2) covers the queue-frame capnp migration and the new host-frame/config-bytes sections together, so this spec introduces exactly one rollout discontinuity, not several staged ones. An old-format on-disk snapshot becomes unreadable by the new binary until that node's next checkpoint cycle regenerates one — consistent with the existing, deliberate fail-loud version-mismatch policy (not a new risk this spec introduces). No phased rollback path is defined beyond redeploying the prior binary version, matching how every prior `SNAPSHOT_FORMAT_VERSION` change in this codebase has been handled. + +## Supporting References +- `research.md` — full discovery findings, exact file:line citations for every function referenced above, and the design-synthesis rationale (generalization/build-vs-adopt/simplification) behind each decision in this document. +- `requirements.md` — the 7 requirements / 38 acceptance criteria this design traces to, plus the Design Invariants section this design's component choices were checked against. diff --git a/.kiro/specs/config-upgrade-snapshot/requirements.md b/.kiro/specs/config-upgrade-snapshot/requirements.md index eb35eea..82e3f3d 100644 --- a/.kiro/specs/config-upgrade-snapshot/requirements.md +++ b/.kiro/specs/config-upgrade-snapshot/requirements.md @@ -2,7 +2,7 @@ ## Introduction -XCE's controller state machine (jobs, queues, hosts, resources) is interpreted against the active configuration. Today a configuration upgrade pushes the new configuration, restarts each controller, and lets each member **re-derive** its post-upgrade state by replaying its pre-upgrade WAL under the new configuration — with no snapshot pinning an identical materialized state across members. Because replay is configuration-dependent (the `lost_and_found` queue/host re-homes entities whose configuration entity vanished), members can diverge in materialized state after an upgrade (bug-857), amplified by any WAL tail divergence. +XCE's controller state machine (jobs, queues, hosts) is interpreted against the active configuration. Today a configuration upgrade pushes the new configuration, restarts each controller, and lets each member **re-derive** its post-upgrade state by replaying its pre-upgrade WAL under the new configuration — with no snapshot pinning an identical materialized state across members. Because replay is configuration-dependent (the `lost_and_found` queue/host re-homes entities whose configuration entity vanished), members can diverge in materialized state after an upgrade (bug-857), amplified by any WAL tail divergence. This feature makes a configuration upgrade establish a **full, entity-bearing state snapshot at the configuration-change boundary**, embed the new configuration in it, and install that same snapshot on every member — so post-upgrade state is identical by construction and no member re-derives it. It was originally Requirement 8 of `ha-term-safety` and is split out because it has a hard prerequisite (entity-bearing snapshots) that does not yet exist. @@ -11,16 +11,29 @@ This feature makes a configuration upgrade establish a **full, entity-bearing st - **In scope**: a full entity-bearing state snapshot (the upgrade snapshot) materialized at the configuration-change marker's `(term, lsn)`; embedding the new configuration in that snapshot; every member ending up holding it, via local materialization (already applied the marker) or the out-of-band snapshot-install transport (behind or freshly joining); an activation gate on the serving primary tied to its own materialization-and-hash-verification completing, not to Raft election eligibility; the post-upgrade materialized-state + active-configuration consistency invariant; superseding `ha-term-safety` R7's interim config-push byte delivery for the upgrade case. - **Out of scope**: - The configuration-change marker and consensus ordering of the change — owned by `ha-term-safety` (Requirement 7). - - The entity-serialization machinery that produces an entity-bearing snapshot — owned by `entity-bearing-snapshots`; this spec **consumes** it. + - The entity-serialization machinery that produces an entity-bearing snapshot — owned by `entity-bearing-snapshots`; this spec **consumes** it, with one explicit exception: this spec adds the new host admin-state frame and migrates the existing queue admin-state frame to Cap'n Proto (see "Host and queue admin-state frames now extensible" below) — a deliberate, narrow modification of that spec's shipped frame *encoding*, not a re-opening of its entity-serialization design. - The Raft protocol (term/log/commit) — owned by the `Raft TLA+ Conformance` library series. - Controller voting-set / membership changes — `ha-config-bootstrap`. + - **Initial/bootstrap configuration replication (config tag zero → first config) — owned by `ha-config-bootstrap`, deliberately NOT unified with this spec's marker+snapshot mechanism (considered and rejected 2026-07-23).** Bootstrap has no pre-existing entity state to protect (a genuinely blank node) and a chicken-and-egg constraint this spec's mechanism cannot resolve: a configuration-change marker is a committed log entry, but at cold-start there is no log or elected leader yet — election itself must work with zero config (`ha-config-bootstrap` Req 2.9/3.3). Forcing bootstrap through marker-commit + snapshot-materialize + hash-verify would also regress single-node self-elect's immediate-serve behavior (Req 2.9). This spec's mechanism activates only for a configuration change on an already-running cluster with live entity state. - **Adjacent expectations**: - **Dependency on entity-bearing snapshots — SATISFIED (2026-07-09) by `ha-entity-snapshots` (21/21 tasks, fully approved).** That spec landed `write_snapshot`/`load_snapshot` (persist.c) as a direct Cap'n-Proto entity-encode/decode of job and queue records at checkpoint time, restoring before advancing position — not the COW `xzarray_freeze`/`thaw` mechanism this line originally anticipated (that machinery remains dormant; `ha-entity-snapshots` took a different, already-shipped implementation path). This spec no longer needs to wait; verify `write_snapshot`'s actual on-disk entity format (persist.c, `ha-entity-snapshots` design.md) before writing this spec's own design so it builds on the real interface, not the COW one originally assumed here. - Anchors on the `(term, lsn)` configuration-change marker from `ha-term-safety`. - Reuses the existing `snapshot_transfer_s` snapshot-install transport (chunked, `(term, lsn)`-anchored, hash-verified, install-before-activate). - Reuses the existing checkpoint machinery (`persist.c` `persist_checkpoint`/`write_snapshot`/`schedule_checkpoint`) as the materialization mechanism rather than a bespoke path: it already runs off the raft apply path via `delaymgr` (never blocks a vtask handler — see `ha-async-io.md`), already guards a single in-flight checkpoint with a CAS (`checkpoint_in_progress`), and already pins `checkpoint_lsn` to `last_applied_lsn`. It already caches a committed-config *reference* (`cfgref_present`/`cfgref_tag`/`cfgref_sha`, `ha-term-safety` task 4.2) in the snapshot header — this spec extends that to a full *embedded* configuration payload, it does not replace the mechanism. - - **Gap identified 2026-07-21 — host frames are missing from the entity-bearing payload.** `write_snapshot` as shipped by `ha-entity-snapshots` calls only `collect_job_frames`/`collect_queue_frames` (persist.c) — there is no `collect_host_frames` and no host section in the on-disk format. Requirement 1.6 (host admin-status in the snapshot) needs this codec extended before it can be satisfied; this is new work, not covered by any existing spec. Design must decide whether host-frame collection/restore belongs in this spec's own tasks or is a small follow-up dependency on `ha-entity-snapshots`'s owners. `resources` (named in the Introduction alongside hosts) has the same open question and was not resolved this session — treat as still-undecided scope, not silently included or excluded. - - **Prepare work (decided 2026-07-21, tracked in `spec.json.blocked_on`) — fix `bug-1418` before or alongside this spec's implementation.** bug-1418 is a still-open, unowned liveness deadlock: a primary whose local *apply* lags behind (but is otherwise safe, not divergent) gets hard-blocked from promotion rather than gracefully catching up, reliably by round 5 of a 10-round chaotic soak. Left unfixed it contaminates Requirement 6's own chaotic-multi-kill soak signal (can't distinguish a real regression from this known unrelated bug firing), and its unimplemented proposed fix — become primary, self-apply, then serve, instead of hard-blocking — is the exact graceful-degrade template Requirement 3's activation gate must follow for materialization-lag. Treat as task 0, not optional cleanup. See project memory `project_bug1418_prework_decision.md`. + - **Gap identified 2026-07-21, scope resolved 2026-07-23 — host frames are missing from the entity-bearing payload; this spec owns adding them.** `write_snapshot` as shipped by `ha-entity-snapshots` calls only `collect_job_frames`/`collect_queue_frames` (persist.c) — there is no `collect_host_frames` and no host section in the on-disk format. This spec's own tasks add it, not a follow-up on `ha-entity-snapshots`'s owners. Confirmed content scope: record **only admin-issued status changes** (open/closed/locked/tagged, via the existing `XCE_WORKER_ADMIN_MASK` — `worker.c:275`), never the full `xce_worker_t` (host attrs and resource values are worker-reported and change dynamically; Requirement 1.7 already excludes them, and a full-struct encode would also break Requirement 5.1 determinism). The existing `capnp_encode_worker`/`Worker` capnp message (`persist.c:82`, used today for `WAL_WORKER_CTRL` replication) is NOT the right vehicle — it bundles static attrs, admin status, and dynamic state (`resvals_to_sched`, `dead_since`) together. Restore does NOT mirror `restore_queue_state`'s update-only assumption — queues are always config-provisioned before restore runs (`collect_queue_frames`'s own doc comment), but hosts are NOT: a `worker_t` is created only by a live join (`join.c:100-102`, `init_worker`), never from `hosts.yaml` config directly, and `worker_ctrl` (`worker.c:655-658`) itself hard `-ENOENT`s an admin command against a host that has never joined. A member receiving the upgrade snapshot via the out-of-band install path (Requirement 1.2's "behind" case) may specifically not have locally replayed that host's original join record yet — that is the whole reason it needs the snapshot instead of local replay. So `restore_host_state` must be **create-if-missing**: if `key_find(c->workermgr, name)` misses, create a minimal placeholder via `makeWorker()` (unjoined/`XCE_WORKER_UNAVAIL` until the physical worker actually connects and `apply_join_state` populates the rest) and set only the admin-status bits on it — mirroring the exact `makeWorker()`-without-join pattern the synthetic `lost_and_found` sentinel host already uses (`config_repl.c:1114-1130`), not inventing a new mechanism. Design must also confirm this restore path is idempotent under a retried partial failure (a second attempt's `makeWorker` call must find and update the placeholder a prior failed attempt already created, not treat it as a duplicate-create conflict — mirroring `restore_job`'s own `-EEXIST`-is-success idempotent-replay handling). `resources` is dropped from scope entirely (see Introduction) — `c->resmgr` entries (`xce_resource_t`, `controller.capnp:200`) are pure config-derived definitions with no admin-mutable field (no open/close/lock action exists for a resource definition), and the dynamic per-load values (`r15s`/`r1m`) already live in the same `w->host.resvals` bucket Requirement 1.7 excludes — there is no distinct "resources" entity needing its own admin-state capture. + - **Host and queue admin-state frames now extensible (capnp), decided 2026-07-23.** Neither frame should be a fixed-shape dead end for future admin-state fields (e.g. a lock reason or tag added later). The queue frame today is a hand-rolled raw layout — `{ uint32_t name_len; name; uint32_t status }` (`snap_queue_frame_t`, `persist.c:1759`) — with zero schema-evolution story: `load_snapshot` hard-rejects any `SNAPSHOT_FORMAT_VERSION` mismatch (`persist.c:2541`, by deliberate fail-loud design, task 5.1), so every future field addition would otherwise force another all-nodes format bump. Cap'n Proto already solves exactly this for job frames (`Job` message, `persist.c:60`) — new fields get new ordinals; old encoded blobs keep decoding under capnp's own schema-evolution rules, no format bump needed per field. Decision: define `HostAdminState` and `QueueAdminState` Cap'n Proto structs (`{ name @0: Text; status @1: UInt32; }` each, independently extensible) and use them for both frame types, migrating the queue frame off its current raw layout in the same pass. This requires exactly **one** `SNAPSHOT_FORMAT_VERSION` bump (covering host+queue together, not two separate migrations later) — an old on-disk snapshot written under the prior raw queue-frame layout becomes unreadable by the new binary until that node's next checkpoint cycle regenerates one, consistent with the existing fail-loud version-mismatch behavior (not a new risk this decision introduces). See the Boundary Context "Out of scope" note above: this is the one explicit, deliberate exception to "this spec consumes, not modifies, `ha-entity-snapshots`'s machinery." + - **bug-1418 — RESOLVED, no longer a blocker.** The 2026-07-21 note here (and the matching `spec.json.blocked_on` entry) treated bug-1418 as a still-open, unowned liveness deadlock requiring a task-0 prerequisite fix. That was stale: `.wolf/buglog.json` already recorded it fixed on 2026-07-09 (resolved via upstream `raft-apply-decoupling` tasks 5.1/5.3/7.2 + bug-1421, not a promotion-gate code change), and it was independently re-verified fresh on 2026-07-23 with a 10-round `--chaotic` soak (`result=PASS`, zero committed divergence, zero committed job loss) against a freshly rebuilt controller. `spec.json.blocked_on` has been cleared. Requirement 6's chaotic-multi-kill soak signal is not at risk of this bug's noise. See project memory `project_bug1418_prework_decision.md`. + +## Design Invariants + +Standing rules for design.md and implementation, distilled from this spec's own requirements discussion (2026-07-23) — not requirements themselves, but constraints any design/implementation must respect: + +1. **Classify every entity type as config-provisioned or join-provisioned before writing its restore path.** Queues are config-provisioned (exist once config loads, independent of any external actor) — update-only restore is safe (`restore_queue_state`). Hosts are join-provisioned (a `worker_t` exists only after a live actor registers, `join.c:100-102`) — restore must be create-if-missing (Requirement 1.10). Assuming update-only for a join-provisioned entity is the exact mistake this spec's own design caught and corrected; any future entity type added to the snapshot must be classified explicitly, not defaulted to whichever pattern was written last. +2. **Frame restore order (job/queue/host) must not matter.** Re-homing (`lost_and_found`) is decided at materialization time and baked into the encoded bytes; restore never re-derives it. Each entity type's restore must be independent of the others having already run. +3. **Every restore path must be idempotent under partial-failure retry.** Established for jobs (`restore_job`'s `-EEXIST`-is-success) and required for the new host placeholder path (Requirement 5.8): a retried restore after a partial failure must find-and-continue, never duplicate-or-conflict. +4. **A format/version mismatch is always fail-loud, never a silent reinterpretation.** Already this codebase's convention for corruption (`persist.c:2541`, task 5.1); now explicitly extended to rolling-binary-upgrade skew on snapshot-install (Requirement 5.6) and the queue-frame layout migration itself (Requirement 5.7). Do not add a compat-shim decode path later that silently reinterprets old bytes under a new schema. +5. **Never reuse an existing wire message wholesale just because it is convenient.** `capnp_encode_worker`/`Worker` (`persist.c:82`) was the readily-available option for host frames and would have been wrong — it bundles static attrs, admin status, and dynamic state together. A snapshot frame's field set must be justified field-by-field against Requirements 1.6/1.7 (admin-state only, dynamic excluded), never inherited by convenience from a message built for a different purpose (replication). +6. **A placeholder entity created out-of-band (Requirement 1.10) must be safe for its eventual real counterpart to adopt.** The `lost_and_found` sentinel host precedent (`config_repl.c:1114-1130`) and the host-frame placeholder both create a `worker_t` via `makeWorker()` outside the normal join flow; the later real join must route through the same admin-bit-preserving path (`rejoin_worker`) an ordinary reconnect uses (Requirement 1.11), and the placeholder must carry a valid, non-NULL `hostattrs_t` so that path's direct dereferences don't crash. Note this codebase already has two independent admin-bit-preserving mechanisms (`wobj.c`'s `override_worker` and `controller/worker.c`'s `rejoin_worker`, duplicating the same `XCE_WORKER_ADMIN_MASK` list) — integrate with the one `join.c` actually dispatches to, don't assume the other's semantics apply. ## Requirements @@ -37,6 +50,9 @@ This feature makes a configuration upgrade establish a **full, entity-bearing st 6. The Controller shall include each host's administratively-set status (e.g., open/closed, locked, tagged) in the materialized snapshot, so that admin-set host state survives a configuration upgrade the same way admin-set queue status already does. 7. The Controller shall exclude dynamic, non-administratively-set host metrics (e.g., load averages, real-time resource utilization samples) from the materialized snapshot, since these naturally re-populate after restart and pinning them would make the snapshot's content non-deterministic (Requirement 5.1) for no correctness benefit. 8. Applying the configuration-change marker shall advance the Controller's apply position and trigger materialization (Requirement 1.5) but shall NOT itself change how the Controller interprets or re-homes entities (e.g., `lost_and_found` re-homing) under the new configuration — that interpretive switch is the activation step gated by Requirement 3.2, never an immediate side effect of apply. Without this separation, Requirement 3.3's "keep serving under the last-verified configuration" is incoherent: apply and activation must be distinct steps, not one. +9. The Controller shall encode the host and queue admin-state frames (Requirement 1.6) as independently-extensible Cap'n Proto structs rather than fixed raw byte layouts, so that a future admin-state field addition (e.g. a lock reason or tag) does not require another snapshot format-version migration. +10. If a host admin-state frame refers to a host with no existing entry in the local worker table at restore time (a member that has not yet locally replayed that host's original join record), the Controller shall create a minimal placeholder entry (unjoined, dead-until-connected) to carry the admin status, rather than failing the restore or discarding the host's admin state — mirroring the existing `makeWorker()`-without-join pattern already used for the synthetic `lost_and_found` sentinel host, never inventing a parallel mechanism. +11. When the physical worker for a placeholder host (Requirement 1.10) later joins for the first time, the Controller shall route that join through the same rejoin path (`rejoin_worker`) an already-known host uses — never the first-time-join path (`init_worker`) — so the placeholder's restored admin-status bits are preserved exactly as `rejoin_worker` already preserves them across an ordinary disconnect/reconnect (`worker.c:374,390`). The placeholder shall therefore be created with a valid, non-NULL `hostattrs_t` (even if minimal/zeroed): `rejoin_worker`'s `apply_join_state` step directly dereferences the existing attrs struct with no null check (`worker.c:376`), and the underlying `copy_worker` allocation path (`wobj.c:51-81`) itself requires a non-NULL source `attrs` — omitting it crashes or `-EINVAL`s on the very first real join, not merely on the placeholder-creation call. ### Requirement 2: Configuration embedded in the upgrade snapshot @@ -66,6 +82,7 @@ This feature makes a configuration upgrade establish a **full, entity-bearing st 1. When members complete a configuration upgrade, every member's materialized state shall be identical. 2. When members complete a configuration upgrade, every member's active configuration shall be identical. 3. While configuration upgrades interleave with failover, the Controller shall preserve the post-upgrade identical-state invariant across leadership changes. +4. If a second configuration-change marker commits before every member has completed installing the previous upgrade snapshot, the Controller shall have the new marker's materialization (Requirement 1.1) cleanly supersede the previous upgrade's in-flight distribution, never leave it partially in-flight or conflated with the new one. ### Requirement 5: Crash-safety and idempotent resumption @@ -77,6 +94,9 @@ This feature makes a configuration upgrade establish a **full, entity-bearing st 3. The Controller shall guard the forced upgrade checkpoint with the same single-in-flight-checkpoint idempotency mechanism used by periodic checkpoints, so that a post-crash retry or a concurrent periodic checkpoint cannot corrupt or partially overwrite the upgrade snapshot. 4. If leadership changes after the configuration-change marker commits but before every member has installed the upgrade snapshot, then the new leader shall resume driving materialization and distribution rather than treating the upgrade as complete or abandoning it. 5. Under no sequence of crashes, restarts, or leadership changes shall a member serve under the new configuration without having durably installed and hash-verified the matching upgrade snapshot (a failure-mode restatement of Requirement 3.2). +6. If the out-of-band snapshot-install transport would deliver a snapshot encoded in a format-version the receiving member's own binary does not recognize (e.g. a member not yet restarted onto the new binary during a rolling software upgrade), the Controller shall reject the install and fail loud rather than partially installing or misinterpreting the bytes, and shall retry once the receiving member is running a compatible binary/format — consistent with the never-self-terminate / stay-alive invariant (`controller/CLAUDE.md`). +7. After the host/queue admin-state frame migration to Cap'n Proto (Requirement 1.9), the Controller shall reject a snapshot encoded in the prior raw queue-frame layout with the same fail-loud, non-corrupting behavior as any other format-version mismatch, never silently reinterpreting old bytes under the new layout. +8. If a prior restore attempt already created a placeholder host entry (Requirement 1.10) before failing partway through the snapshot, a retried restore shall find and reuse that placeholder rather than treating its existence as a conflict — the same idempotent-replay guarantee `restore_job`'s `-EEXIST`-is-success handling already provides for jobs. ### Requirement 6: Reproduction and regression @@ -86,3 +106,14 @@ This feature makes a configuration upgrade establish a **full, entity-bearing st 1. When the regression scenario interleaves a configuration upgrade with chaotic multi-kill failover, the test shall assert that every member's materialized state and active configuration are identical afterwards. 2. The test shall reproduce the bug-857 materialized-state divergence on the pre-fix code (config-push + per-node replay) and pass on the fixed code. 3. The test shall inject a controller crash/restart and a leadership change between configuration-change marker commit and upgrade-snapshot-install completion, and assert the post-upgrade consistency invariant (Requirement 4) and the crash-safety invariant (Requirement 5.5) still hold. +4. The regression test shall explicitly assert that a host's administratively-set status (open/closed/locked) survives the configuration-upgrade-plus-chaotic-failover scenario, not merely rely on the aggregate materialized-state equality check (Requirement 6.1) to imply it. + +### Requirement 7: Regression coverage for the host-placeholder, overlapping-upgrade, format-mismatch, and WAL-trim mechanisms + +**Objective:** As a maintainer, I want the new mechanisms this spec introduces — host-placeholder creation and rejoin, overlapping upgrades, format-version mismatch handling, and the marker-triggered checkpoint's interaction with WAL-segment trim — exercised by their own regression tests, so they cannot silently regress the way bug-857 did before it had one. + +#### Acceptance Criteria +1. The test suite shall exercise a host admin-status change (e.g. close) issued while that host is down, followed by a configuration upgrade whose snapshot restores on a member with no local record of that host's join, followed by the host's real first join, and assert the admin status is preserved through the placeholder-then-rejoin path (Requirements 1.10, 1.11). +2. The test suite shall exercise a second configuration-change marker committing before every member has finished installing the previous upgrade snapshot, and assert the previous upgrade's distribution is cleanly superseded rather than left partially in-flight or conflated (Requirement 4.4). +3. The test suite shall assert that a snapshot encoded in a format-version the receiving binary does not recognize — whether from a rolling binary upgrade (Requirement 5.6) or the prior raw queue-frame layout (Requirement 5.7) — is rejected fail-loud, never partially installed or silently reinterpreted. +4. The test suite shall exercise the marker-triggered forced checkpoint's WAL-segment trim (Requirement 1.1) while a standby is genuinely mid-catch-up (has not yet acked the marker's LSN), and assert that standby's still-needed WAL segments are not stranded — the existing retention-floor guard (`repl_trim_lsn`/`trim_wal_segments`, bug-1147) must hold identically under this new trigger path as it already does under the periodic WAL-threshold trigger, including under the chaotic multi-kill conditions Requirement 6 exercises. diff --git a/.kiro/specs/config-upgrade-snapshot/research.md b/.kiro/specs/config-upgrade-snapshot/research.md index fb87710..8e6b4c4 100644 --- a/.kiro/specs/config-upgrade-snapshot/research.md +++ b/.kiro/specs/config-upgrade-snapshot/research.md @@ -312,3 +312,111 @@ Three items, only two are genuinely new build work: (bug-970) already wires `WAL_CONFIG_MARKER` into the live upgrade path, so the bug-857 repro (Req 6.2) is triggerable today with existing tooling — no blocker there. + +--- + +## Update — 2026-07-23 (design discovery; requirements extended to 7 requirements/36 ACs) + +Requirements went through several rounds of review this session (host/queue admin-state frames, bug-1418 re-verified fixed, bootstrap-vs-upgrade boundary, Design Invariants section, Requirement 7 added for new-mechanism regression coverage). This update captures the DESIGN-level discovery done to write `design.md`, current as of 2026-07-23, extension-scope (light discovery — existing system, no new external dependency). + +### Discovery: exact hook points for the marker → materialization trigger (Req 1.1, 1.5, 1.8) + +**The single unified apply seam is `apply_committed_entry`** (`persist.c:2751-3132`), confirmed as the ONLY live path for entity mutation on every member — primary online-apply (`persist_apply_pump_run` → `persist_apply_pump_kick`, vtask-pool dispatched, `persist.c:3383`), standby normal apply (`ha_standby_advance_committed_and_apply`, heartbeat-learned commit position, `ha.c:2596-2613/2688-2700` — supersedes the older "apply on receipt" bug-1043 fix as of 2026-07-10), and boot/restart replay (`persist.c:3920`). The sibling dispatcher `apply_wal_entry` (`persist.c:2583-2714`) has **zero live callers** (grep-confirmed) — fully superseded, dead code, not a second seam to worry about. `WAL_CONFIG_MARKER` currently falls into `apply_committed_entry`'s generic `default:` no-op (`persist.c:3126-3131`) and `apply_wal_entry`'s equivalent no-op (`persist.c:2697-2707`, irrelevant given no callers). **Design decision: add one new explicit `case WAL_CONFIG_MARKER:` in `apply_committed_entry` only** — it fires identically for primary and standby, satisfying Req 1.2's "every member... via that member's own local materialization once it has applied the marker itself" for free, with no per-role branching needed. + +**Today's restart+replay behavior being replaced** lives in `do_upgrade_config_with_bytes` (`config_repl.c:1591-1773`, step 9, `config_repl.c:1753-1772`): `atomic_store(&c->restart_requested, 1)` + `cbuf_put(&c->wbuf, &stop_val)`. An existing NOTICE comment at `config_repl.c:1737-1751` already names this exact spec by path and describes the target end-state verbatim — a strong signal the upgrade path's own maintainers already anticipated this design. No function-pointer hook exists at that NOTICE site (grepped, none) — it is a plain fall-through, confirming the real trigger point is the `apply_committed_entry` case above, not this step-9 comment site itself. **Once the new case lands, step 9's restart/replay becomes dead code for the upgrade path and should be removed** (not left as a parallel fallback — Design Invariant "never leave two mechanisms doing the same job"). + +### Discovery: checkpoint triggering — no forced/immediate entry point exists yet (Req 1.5) + +`persist_checkpoint()` (`persist.c:2262-2321`) is unconditionally synchronous/blocking (fdatasync-backed `write_snapshot`, directory scans) and has exactly one production trigger path today — `schedule_checkpoint()` (`persist.c:2238-2256`), fired only by a WAL-record-count threshold inside `persist_wal_async()` (`persist.c:921-928`). No wall-clock periodic timer exists in the live code (an older design doc's `checkpoint_requested`/`persist_checkpoint_timer_fn` was never implemented — grep-confirmed absent). **No `force_checkpoint()`/`persist_checkpoint_now()` entry point exists** — but a second direct, unconditional call to `persist_checkpoint()` already exists at `ha.c:3308` inside `ha_snapshot_do_send()` ("Req 4.1: create a FRESH checkpoint..."), proving the function itself already tolerates being force-invoked outside the record-count path (it already handles the `-EBUSY` a concurrent scheduled checkpoint can return, via the shared `checkpoint_in_progress` CAS, `persist.h:415`). + +Two existing patterns already solve "trigger without blocking the caller" in this codebase — `delay_task`/delaymgr enqueue (what `schedule_checkpoint` does; the *actual* checkpoint I/O then runs on the delaymgr thread itself, per direct trace of `delay_worker`/`run_delay_tasks`, `delay.c:60`/`cluster.c:988-991` — delaymgr has no thread-pool hand-off) and the dedicated **slow-lane executor** (what `ha_snapshot_do_send` uses, `ha.c` ~6120-6160, specifically because `persist_checkpoint` is blocking/unbounded — this is the pattern `ha-async-io.md:29` documents as the bug-1198 fix for inline-on-iomgr checkpoint I/O). **Design decision: the new `WAL_CONFIG_MARKER` case in `apply_committed_entry` calls `persist_checkpoint()` directly, not via either existing indirection.** This is safe specifically because `apply_committed_entry` (via the apply pump) already runs on its own vtask-pool worker thread, never the iomgr or delaymgr thread — it IS the async-dispatched context, so no further hand-off is needed for THIS call site (unlike `schedule_checkpoint`'s WAL-threshold trigger, which fires from arbitrary vtask handlers appending WAL entries and genuinely needs delaymgr's async return). This gives Req 1.5's "immediate and deterministic" trigger for free — no new delay/lane plumbing required — while the CAS (`checkpoint_in_progress`) already guards against a racing periodic checkpoint. + +**Note for design (not a requirements gap, an implementation-order note):** `scan_latest_committed_config_ref`/`write_snapshot`'s existing `persist_checkpoint` call sequence (`persist.c:2301/2305`) always stamps `checkpoint_lsn = last_applied_lsn` (`persist.c:2292-2295`) — i.e. a marker-triggered forced checkpoint calling `persist_checkpoint()` at the moment `apply_committed_entry` handles the marker will naturally pin `checkpoint_lsn` to the marker's own `(term,lsn)`, satisfying Req 1.1's "materialize at that marker's boundary" without any new LSN-targeting parameter — `persist_checkpoint()` doesn't need to accept an explicit target LSN; it just needs to run at the right moment, which the new apply-time case guarantees by construction. + +### Discovery: the activation gate has a direct, reusable precedent (Req 3) + +`ha_dispatch_gate` (`ha.c:3809-3975`, single call site `cluster.c:276`, gating every wire request — client and peer alike, both HA replication opcodes and apiserver-relayed job/queue/host opcodes) already composes multiple independent boolean fences in sequence for the `CTRL_PRIMARY` role: role check, then a **config-serve-fence check** (`config_serve_fenced(ha->raft_c)`, `ha.c:3827`), then a write-quorum check. This is a **direct structural precedent already in production** for exactly what Req 3 needs — a config-dependent, state-changing-request fence that is orthogonal to role/quorum, with its own opcode allowlist (replication + read-only ops stay admitted while fenced). + +The existing `config_serve_fence` (`ha.h:307-322`, set/cleared by `config_activate_committed` in `config_repl.c:304-377`, hash-verifies committed marker bytes against locally-held config bytes) is the closer of the two fence precedents found (the other being `recovery_unrecoverable`, which only gates *promotion*, not live serving) because it already: (i) blocks client-request serving via `ha_dispatch_gate`, (ii) also blocks promotion (`ha.c:1425-1440`, `ha_config_promotion_fenced()`), and (iii) self-clears via a fully-wired, non-blocking retry loop (`config_schedule_activate_retry` → delaymgr trampoline → vtask does the actual blocking verify I/O, `config_repl.c:415-507`), triggered from the commit-advance callback (`ha.c:2197-2198`) — the exact "loud ERROR once, stay alive, keep retrying, never self-terminate" shape `controller/CLAUDE.md` mandates, already proven in production. **Design decision: add a new atomic fence field on `ha_state_t` (sibling to `config_serve_fence`, e.g. `upgrade_snapshot_fence`), a matching setter/verify function mirroring `config_activate_committed`'s hash-verify-then-clear shape, and one more fence check inside `ha_dispatch_gate`'s `CTRL_PRIMARY` branch** (composed the same way the existing config-serve-fence check already is — not folded into that same field, since the two conditions are logically independent: config-serve-fence is about byte-mismatch, the new fence is about materialization-not-yet-complete for an otherwise-matching config) — reusing `config_schedule_activate_retry`'s exact trampoline shape for the new fence's own retry loop, and `ha_config_promotion_fenced()`'s pattern for gating promotion the same way. + +### Discovery: durable_lsn is NOT advanced by snapshot-install — real but bounded gap (Req 1.2, 5.x) + +Traced definitively (grep + direct read of every function in the call path): `ha_handle_snapshot_chunk` (`ha.c:3014-3171`) → `persist_load_snapshot`/`load_snapshot` (`persist.c:2456-2575`) never touches `p->durable_lsn` anywhere — only `checkpoint_lsn`/`current_lsn`/`cfgref_*` get set. This is asymmetric with the boot-recovery path (`persist_recover`, `persist.c:4338-4353`), which DOES re-derive `durable_lsn` from the recovered WAL tip. **Verdict: real, confirmed gap, but bounded to this node's OWN promotion-eligibility/self-advertised-freshness bookkeeping during a narrow live-catch-up window** (`persist_durable_floor` consumers: pre-promotion gate `ha.c:1318-1352`, promotion truncate-floor clamp `ha.c:1259-1262`, self-advertised candidate position `ha.c:4540-4546`) — the existing fence-and-retry machinery (`ha_arm_promotion_fence_timer`) already handles this safely (conservative refusal to self-promote, never corruption). It is **NOT** a commit-durability/majority-counting safety gap for OTHER members counting a snapshot-caught-up peer, because `majority_candidate_locked` (`commit.c:167-172`) already excludes any standby with `in_catch_up != 0` from majority evaluation, and that flag is cleared only by a real WalAck reaching `catchup_derive_target` (`repl.c:713-739`, via `ha_walack_on_ack`) — a separate, already-safe gate keyed off real acks, not the snapshot event. **Design decision: out of this spec's scope to fix** (it predates this spec, applies to any snapshot-install today including plain recovery-driven catch-up, not upgrade-specific) — but flag it as a design.md Risk/Note so a future spec can pick it up (advancing `durable_lsn` on snapshot-install the same way boot-recovery does would close it cleanly, mirroring `persist.c:4338-4353`'s ASSIGN semantics). + +### Discovery: test tooling — three reusable as-is, two confirmed genuine new-build gaps + +Confirmed via direct read (not just trusting the 2026-07-21 update above, which was itself a research note, not a verified read): +- **`snapverify_path`** (`testsuite/snapverify.c`) — confirmed `has_cfgref` is presence-only (`header[16]`), never decodes tag/sha; zero test assertions on it exist today. Needs extending to decode/assert tag+hash for Req 4.2/Req 2 coverage. +- **`snapdiff_paths`** (`testsuite/snapdiff.c`) — confirmed reusable as-is for Req 5.1's determinism check (any two paths, no transport-specific assumptions). +- **`walcompare`/`walcompare_report`** (`testsuite/walcompare.c`) — confirmed zero references to `cfgref_tag`/`cfgref_sha`/config bytes anywhere in the file; compares only `(lsn, term, pcrc)`. Req 4.2 (active-config identity across members) has no assertion tool — needs either extending `walcompare` or a sibling tool. +- **Fault-injection precedent, exact shape confirmed**: `ha_stream_body_read_fault_hook` (`config_repl.c:2104-2106`, wired at `config_repl.c:2183-2193`) and `xce_snapshot_chunk_hook` (`config_repl.c:2847`, wired at `config_repl.c:2937-2949`) are both `#ifdef XCE_TESTING`-gated, `NULL`-by-default, file-scope function-pointer globals, `extern`-declared and set/reset around the driving call in the test file. This is the exact shape the two NEW deterministic hooks (Req 7.2's marker-apply→forced-checkpoint-durable window, Req 7.2/5.4's leadership-change-mid-distribution window) should mirror — a hook inside the new `apply_committed_entry` `WAL_CONFIG_MARKER` case (or wherever the cross-member install-wait loop lives) taking identifying args (marker lsn/term) so a test can force-fail/force-delay at that exact boundary instead of relying on chaotic-soak timing luck. +- **Test fixture pattern, exact shape confirmed**: `test_apply_committed_entry.c` (bare in-memory `cluster_t`, no disk, direct `apply_committed_entry()` calls, spy hooks counting `HOOK_AFTER_EVENT` fires) and `test_replay_apply_seam.c` (real disk-backed `persist_t`, two-phase write-then-recover, proving replay routes through the same seam) are the two patterns new host-frame-restore and marker-apply tests should extend — both already have a `tace_encode_worker`/`trr_encode_worker` local-capnp-encode helper (mirroring `persist.c`'s file-static `capnp_encode_worker`) that a new host-admin-frame test can copy the idiom from. + +### Design Synthesis (per `rules/design-synthesis.md`) + +**1. Generalization**: The host-admin-state frame (Req 1.6/1.9/1.10) and the queue-admin-state frame (existing, now migrated to capnp per Req 1.9) are the same underlying shape — `(name, status)` with independently-extensible fields. Rather than two hand-written near-duplicate collect/restore function pairs, design one generic `collect_admin_state_frames(table, status_mask)`/`restore_admin_state_frame(table, name, status, create_if_missing_fn)` pair parameterized over which table (`workermgr`/`qmgr`) and which create-if-missing behavior (hosts: `makeWorker`-based placeholder; queues: none, always pre-provisioned) applies — the two concrete restore functions (`restore_host_state`, `restore_queue_state`) become thin instantiations, not independent implementations. This directly follows Design Invariant 1 (classify config- vs join-provisioned) by construction: the generic function takes the classification as a parameter rather than assuming one. + +**2. Build vs. Adopt**: Every major piece here is "adopt existing internal mechanism," not "build new" — the snapshot transport (`snapshot_transfer_s`/`ha_handle_snapshot_chunk`), the checkpoint/CAS machinery (`persist_checkpoint`/`checkpoint_in_progress`), the fence-and-retry pattern (`config_serve_fence`), the placeholder-entity pattern (`lost_and_found`'s `makeWorker()` precedent), and the fault-injection hook shape (`ha_stream_body_read_fault_hook`) are all reused verbatim rather than reimplemented. The only genuinely NEW machinery is: the `WAL_CONFIG_MARKER` case in `apply_committed_entry`, the new fence field + verify function (structurally mirroring `config_serve_fence` but a distinct field), the config-bytes-embed in the snapshot header/entity payload, the `HostAdminState`/`QueueAdminState` capnp structs, and the two new test hooks. No external library or new dependency is involved anywhere in this spec. + +**3. Simplification**: Considered whether the new fence needs to be a SEPARATE atomic from `config_serve_fence` — confirmed yes (the two conditions are logically independent: hash-mismatch vs materialization-incomplete, and Req 3.4 needs to distinguish "keep serving under last-verified config" from "no verified config exists yet," which requires knowing WHICH fence is active). Considered whether `apply_wal_entry` needs a matching `WAL_CONFIG_MARKER` case for symmetry with `apply_committed_entry` — confirmed no, it has zero live callers, touching it would be pure speculative-symmetry work with no runtime effect (Design Invariant would call this exactly the "convenient but unjustified" mistake to avoid). + +### Risks carried into design.md +- The narrow window between `schedule_checkpoint`'s CAS release (`checkpoint_task_fn`, `persist.c:2222`) and `persist_checkpoint`'s own re-acquire (`persist.c:2265`) allows a second concurrent trigger to slip in and start its own `persist_checkpoint()` call — pre-existing, not introduced by this spec, but the new marker-triggered call site adds a second caller into this same race window and should be noted. +- `durable_lsn` not advancing on snapshot-install (above) — pre-existing, out of scope, flagged for a future spec. + +--- + +## Cross-Spec Gap Analysis: admin-config-tool × config-upgrade-snapshot × clusterconfig-schema-split (2026-07-28) + +### 1. Current State Investigation + +All three specs touch the same controller-side config surface (`controller.capnp`'s `ClusterConfig`, `config_repl.c`'s `OP_upgradeConfig` handler, `cluster.c`'s dispatch gate) from different angles: + +| Spec | Phase | Scope | +|---|---|---| +| `clusterconfig-schema-split` | `implementation-complete` | Remove per-instance/dead fields (`port`, `candidates`, perf-tuning) from `ClusterConfig` | +| `admin-config-tool` | `implementation-complete` (blocked_on stale — see §2) | `xceadmin` CLI: build/push `cluster.bin` against the controller | +| `config-upgrade-snapshot` | `tasks-generated`, 18/19 actionable tasks `[x]` | Snapshot the config alongside cluster state at every upgrade boundary; activation fencing | + +**Verified current schema state** (`src/schema/controller.capnp:712-726`): `ClusterConfig` has exactly 13 fields (`@0`–`@12`: `clusterName` … `configGeneration`), matching `clusterconfig-schema-split`'s Requirement 3.1 target exactly. `MasterCandidate`/`HashZArrayConfig`/`ResmgrConfig` are gone (Requirements 1.6/2.5). `config-upgrade-snapshot`'s own schema additions (`HostAdminState`, `QueueAdminState`, lines 769/774) are **separate message types**, not fields on `ClusterConfig` itself — **no ordinal collision or renumbering conflict between the two specs' schema work.** + +**Verified dispatch-gate state** (`src/controller/cluster.c:669-694`): the `OPCode_upgradeConfig` polarity-inversion bug that `admin-config-tool`'s `spec.json.blocked_on` and `tasks.md` (line 155) both cite as blocking real-cluster `config push` E2E validation is **already fixed** — commit `959b0cda` (bug-1468, landed 2026-07-25 as part of `config-upgrade-snapshot` task 8.6). The fix's own comment in `cluster.c` explicitly cross-references `admin-config-tool`: *"Independently diagnosed and documented as a blocking risk by the admin-config-tool spec (design.md 'Boundary Commitments' / 'Risks') before config-upgrade-snapshot task 8.6 needed a live OP_upgradeConfig sender and hit the same wall."* + +### 2. Gap Found: `admin-config-tool`'s `blocked_on` is stale documentation, not a live blocker + +`admin-config-tool/spec.json`'s `blocked_on` array still lists: +> "controller OP_upgradeConfig dispatch defect (cluster.c:667-679 vs ha.c:3926-3951) blocks real-cluster config push E2E validation" + +This is the exact same defect as bug-1468, fixed 2026-07-25. Additionally, **the same controller-side `OP_upgradeConfig` path this blocker describes has since been exercised live, repeatedly, and successfully** by `config-upgrade-snapshot`'s own `--config-upgrade` soak (`.claude/skills/xce-test-ha/run-ha-soak.sh`) — dozens of live 3-node runs today alone, all showing correct dispatch, config replication, majority-ack, and `WAL_CONFIG_MARKER` commit. The only difference is the *client*: the soak drives the RPC via `xce_test`'s hand-rolled `upgradeconfig` command (built for `config-upgrade-snapshot` task 8.6, since no other live `OP_upgradeConfig` client existed at the time), not `xceadmin`'s Python `config push`. But the **controller-side code path is identical** for both clients — the dispatch gate doesn't distinguish caller identity. + +- **Gap classification**: Missing (stale tracking data, not missing capability). `admin-config-tool`'s actual E2E validation task (referenced in tasks.md line 155) can very likely be marked done now, or re-run directly with `xceadmin config push` against a live cluster to close it out formally — the blocking condition itself no longer exists. +- **Recommendation for design/task phase**: Clear `admin-config-tool/spec.json`'s `blocked_on` entry (or mark it resolved with a dated note, matching this codebase's own convention — e.g. `clusterconfig-schema-split`'s already-resolved entries and `config-upgrade-snapshot`'s own dated Implementation Notes). If the E2E task was left unchecked pending this, run `xceadmin config push` against a real deployed cluster (`/xce-deploy-ha`) once to get first-hand `xceadmin`-specific confirmation (not just proof the shared controller path works) — the CLI's own TLS/redirect/framing code (Requirements 2–3) has never been proven against the real handler, only mock-tested (per tasks.md's own note). + +### 3. Gap Found (residual, this session): `config-upgrade-snapshot` task 8.6 — new commit-timeout issue post-bug-1477 + +`config-upgrade-snapshot`'s own remaining task (8.6, live chaotic-upgrade soak) was blocked on bug-1472 → then bug-1477 (both now fixed and verified this session — see `.wolf/buglog.json`). Re-running `--config-upgrade` after the bug-1477 fix shows the soak's core assertions (checkpoint-identity, config-identity, host-admin-status survival — the things bug-1471/1472/1477 blocked) all **PASS** for the first time. But the same run then fails later, in the force-elect-rotation step, with repeated commit timeouts (`rc=-110`) on the primary — a step this soak scenario has **never previously reached** (every prior attempt failed earlier). This is very likely a fourth pre-existing, newly-exposed defect in the same family as bug-1471/1472/1474/1477 (surfaced by clearing the earlier blockers, not caused by them) — **not yet root-caused**, flagged for the next investigation pass. Task 8.6 remains open pending this. + +- **Gap classification**: Unknown (root cause not yet investigated — flagged, not analyzed, per this skill's "defer deep research to design phase" principle). +- **Ownership**: Likely `UNCLEAR` until investigated — could be `ha-commit-durability`/`ha-term-safety`/raft-log-replication territory (commit-engine admission capacity or write-quorum under chaos), or a `config-upgrade-snapshot`-adjacent interaction. Follow this session's established routing discipline (bug-1471→1472→1474→1477 precedent): root-cause first, only fix in-place if narrowly scoped, otherwise route to the owning spec and keep task 8.6 blocked. + +### 4. No gap found: `clusterconfig-schema-split` × `admin-config-tool` integration + +`admin-config-tool/requirements.md`'s own Adjacent Expectations section already documents this dependency as "RESOLVED, landed" (commit `519e11c`), and the verified current schema state (§1 above) confirms it: `port`/`candidates`/perf-tuning fields are genuinely absent from `ClusterConfig`, so `xceadmin`'s Requirements 1.8–1.10 (never source these fields) have nothing to accidentally violate — the fields don't exist to source. No further action needed here. + +### 5. No gap found: `clusterconfig-schema-split` × `config-upgrade-snapshot` schema coexistence + +Verified directly (§1): the two specs' schema additions/removals touch disjoint parts of `controller.capnp` (`ClusterConfig`'s field list vs. new standalone `HostAdminState`/`QueueAdminState` structs). No ordinal renumbering conflict, no shared struct mutated by both specs in incompatible ways. + +### Summary Table + +| # | Finding | Classification | Effort | Risk | Action | +|---|---|---|---|---|---| +| 1 | `admin-config-tool` `blocked_on` stale (bug-1468 already fixed) | Missing (tracking, not capability) | S (update spec.json + one live `xceadmin config push` run) | Low | Clear blocker, optionally run one live E2E confirmation | +| 2 | `config-upgrade-snapshot` task 8.6: new commit-timeout past force-elect step | Unknown (not yet root-caused) | Unknown until investigated | Medium–High (commit/write-quorum path) | Dedicated debug pass before considering 8.6 closeable | +| 3 | `clusterconfig-schema-split` ↔ `admin-config-tool` | No gap | — | — | None | +| 4 | `clusterconfig-schema-split` ↔ `config-upgrade-snapshot` schema | No gap | — | — | None | + +### Research Needed (carried forward) +- Root cause of the new post-bug-1477 commit-timeout (finding #2) — not investigated in this pass, flagged only. + +**Resolved during this pass** (no longer open): `admin-config-tool/tasks.md` was audited directly — all 23 tasks are `[x]`, none gated on the stale blocker as an active checklist item. The E2E gap is purely `spec.json.blocked_on` + an informational `tasks.md` note (line 155), not an incomplete task. Confirms finding #1 is pure metadata cleanup, not a reopened implementation gap. diff --git a/.kiro/specs/config-upgrade-snapshot/spec.json b/.kiro/specs/config-upgrade-snapshot/spec.json index 3860af4..17be733 100644 --- a/.kiro/specs/config-upgrade-snapshot/spec.json +++ b/.kiro/specs/config-upgrade-snapshot/spec.json @@ -1,25 +1,23 @@ { "feature_name": "config-upgrade-snapshot", "created_at": "2026-06-21T11:30:00Z", - "updated_at": "2026-06-21T11:30:00Z", + "updated_at": "2026-07-29T04:10:00Z", "language": "en", - "phase": "requirements-generated", + "phase": "tasks-generated", "approvals": { "requirements": { "generated": true, - "approved": false + "approved": true }, "design": { - "generated": false, - "approved": false + "generated": true, + "approved": true }, "tasks": { - "generated": false, - "approved": false + "generated": true, + "approved": true } }, - "ready_for_implementation": false, - "blocked_on": [ - "bug-1418 (apply-lag promotion-gate liveness deadlock) — decided 2026-07-21 as prepare work for this spec: fix before/alongside implementation. Contaminates this spec's own Requirement 6 chaotic-multi-kill soak signal, and its graceful-degrade fix pattern is the template Requirement 3's activation gate must mirror. No spec currently owns it — scope as task 0 / a small prerequisite fix. See project memory project_bug1418_prework_decision.md." - ] + "ready_for_implementation": true, + "blocked_on": [] } diff --git a/.kiro/specs/config-upgrade-snapshot/tasks.md b/.kiro/specs/config-upgrade-snapshot/tasks.md new file mode 100644 index 0000000..10756be --- /dev/null +++ b/.kiro/specs/config-upgrade-snapshot/tasks.md @@ -0,0 +1,197 @@ +# Implementation Plan + +- [x] 1. Define HostAdminState and QueueAdminState Cap'n Proto structs and bump the snapshot format version + - Add `HostAdminState { name; status }` and `QueueAdminState { name; status }` messages to the controller schema, independently extensible for future admin-state fields + - Bump the on-disk checkpoint format version so any binary reading a checkpoint under the old queue-frame layout hard-rejects it rather than misinterpreting the bytes + - Observable: schema compiles, generates the new message types, and a checkpoint file written under the new version is rejected by code still expecting the old version + - _Requirements: 1.9, 5.7_ + +- [ ] 2. Core: snapshot entity and configuration payload — collection and write side +- [x] 2.1 Collect host admin-state frames into the checkpoint + - Walk the live host table the same way existing job/queue frame collection does, encoding only administratively-set status bits (open/closed/locked/tagged) per host as a HostAdminState frame + - Exclude every worker-reported, dynamically-changing field (resource values, liveness timestamps, non-admin status bits) from the encoded frame + - Observable: a checkpoint taken while a host is administratively closed contains exactly one HostAdminState frame for that host with only the admin bits set, and none of its dynamic fields + - _Requirements: 1.6, 1.7, 1.9_ + +- [x] 2.2 Migrate queue admin-state frames to the new wire format + - Replace the queue frame's fixed raw byte layout with QueueAdminState encoding, preserving the same name+status content + - Observable: a checkpoint's queue section decodes via the new message type, and a checkpoint written under the prior raw layout is rejected fail-loud rather than silently reinterpreted + - _Requirements: 1.9, 5.7_ + +- [x] 2.3 Embed the active configuration bytes into every checkpoint + - Read the locally-held active configuration bytes directly from where they are already durably saved on disk, and append them as a new checkpoint section after the host frames + - Ensure this section is populated on every checkpoint (not only a marker-triggered one), so a member joining or catching up after the marker-triggered snapshot has rotated away still receives configuration and state together + - Keep configuration bytes out of WAL entry payloads entirely — only the checkpoint file carries them + - Observable: any checkpoint file, marker-triggered or periodic, contains a configuration-bytes section whose content hash matches the currently active configuration; two independent materializations at the same marker boundary and configuration produce byte-identical checkpoint files + - _Requirements: 2.1, 2.3, 2.4, 5.1_ + +- [x] 3. (P) Restore a host admin-state frame safely regardless of whether the host has ever joined this member + - Look up the host by name in the live host table; if present, OR the restored admin-status bits into its current status + - If absent, create a minimal placeholder entry (unjoined, dead-until-connected) carrying only the restored admin-status bits, using the same host-creation mechanism the existing synthetic sentinel host already uses without requiring a live join + - Ensure the placeholder is valid enough that the host's real, later join is treated as an ordinary reconnect rather than a first-time join, so its existing admin-bit-preserving behavior applies unchanged + - Guard against a retried restore attempt re-creating or conflicting with a placeholder an earlier, partially-failed attempt already created — find first, create only if truly missing + - Observable: restoring a host admin-state frame for a host with no local record creates exactly one placeholder entry carrying the correct admin bits; restoring it again (simulating a retry) does not create a duplicate or error; when that host later joins for real, its admin status (e.g. closed) is still set afterward + - _Requirements: 1.10, 1.11, 5.8_ + - _Boundary: Host Restore (worker.c)_ + +- [x] 4. Decode host and queue admin-state frames on checkpoint load + - Add host-frame decoding to the checkpoint load path, dispatching each decoded frame to the host restore capability + - Update queue-frame decoding to read the new QueueAdminState encoding instead of the old raw layout, without changing the existing queue-state-restore behavior itself + - Preserve the existing restore discipline: every frame in the checkpoint restores successfully before any position is advanced; any restore failure leaves prior state untouched + - Observable: loading a checkpoint containing host and queue admin-state frames restores every host and queue's admin status correctly regardless of restore order between entity types + - _Requirements: 1.10_ + - _Depends: 2.1, 2.2, 3_ + +- [x] 5. Materialize the upgrade snapshot when a configuration-change marker is applied + - Add explicit handling for the configuration-change marker in the single, unified entity-apply dispatch point (the same seam every member's apply already routes through — primary, standby, and restart replay alike), replacing its current no-op treatment + - Trigger a forced checkpoint at that exact point, so materialization happens immediately and deterministically at the marker's boundary rather than waiting for a periodic trigger + - Ensure the forced checkpoint shares the existing single-in-flight checkpoint guard, so a concurrent periodic checkpoint and this one can never both proceed at once + - Treat a "checkpoint already in progress" outcome (e.g. a second configuration marker committing while an earlier one's checkpoint is still running) as an expected, self-resolving condition, not a failure to retry specially + - Ensure this trigger only materializes state — it must not itself change how entities are interpreted or re-homed under the new configuration + - Observable: applying a configuration-change marker produces a checkpoint at that marker's exact position, on both the primary and a standby, without requiring a controller restart; a second marker committing while the first's checkpoint is still running does not corrupt or lose either checkpoint + - _Requirements: 1.1, 1.5, 1.8, 4.4, 5.2, 5.3_ + - _Depends: 2.1, 2.2, 2.3_ + +- [ ] 6. Core: activation fence gating serving and promotion on materialization +- [x] 6.1 (P) Add a materialization-and-hash-verification fence independent of the existing configuration-byte fence + - Introduce a new fence condition distinct from the existing configuration-byte-mismatch fence, since "bytes don't match" and "materialization for a matching configuration isn't done yet" are different conditions that must be distinguishable + - Verify by reading the current committed configuration-change marker and this member's own materialized-and-verified state for it, always re-reading the live, currently-active configuration bytes on disk on every verification attempt rather than trusting a previously-embedded or cached copy + - Set the fence and log the actionable mismatch loudly on failure; clear it on success; never terminate the process on this condition + - Observable: a member whose materialization for the current marker is incomplete or mismatched shows the fence set and a loud log entry naming the marker; once materialization completes and bytes match, the fence clears without any process restart + - _Requirements: 1.8, 3.2, 3.4_ + - _Boundary: Activation Fence (ha.c/ha.h)_ + +- [x] 6.2 Gate primary request-serving and promotion on the new fence + - Extend the primary request-dispatch gate with this new fence check, composed alongside the existing configuration-byte fence rather than merged into it, admitting replication and read-only operations while fenced and refusing state-changing client requests + - Extend the promotion gate the same way, so a member whose materialization is incomplete cannot become primary and immediately violate the serving gate the moment it wins an election + - Introduce no new promotion-eligibility mechanism for WAL/log completeness — this fence is about materialization completeness only, layered on top of the existing Raft log-freshness election gate, not replacing or duplicating it + - Wire a non-blocking, self-triggering retry so the fence re-verifies and clears automatically once conditions allow, without any operator action + - Observable: a fenced primary continues answering read-only and status requests but rejects a state-changing client request with a not-ready response; a fenced member that wins an election does not begin serving under the new configuration until the fence clears on its own + - _Requirements: 3.1, 3.2, 3.3, 3.4, 4.3, 5.5_ + - _Depends: 6.1_ + +- [x] 7. Remove the per-node restart/replay fallback and replace it with the marker-triggered materialization + - Delete the configuration-upgrade handler's restart-request step now that materialization is driven entirely by the marker-apply trigger, decoupled from that request-handling code path + - Add a deterministic test seam that can force a leadership change to land exactly between a configuration-change marker's commit and every member completing its snapshot install, for later regression use + - Observable: pushing a configuration upgrade no longer restarts any controller process, and every member reaches the new configuration through the marker-apply trigger alone + - _Requirements: 1.2, 1.3, 1.4, 2.2, 5.4, 6.3_ + - _Depends: 5_ + +- [ ] 8. Validation: regression coverage for every new mechanism +- [x] 8.1 (P) Unit-test the marker-apply trigger and its interaction with WAL retention + - Assert the configuration-marker case fires a checkpoint exactly once per apply and is safe under a forced retry + - Assert the trigger does not itself re-home entities + - Add a deterministic fault-injection seam at the marker-apply-to-checkpoint-durable boundary, mirroring the existing fault-hook pattern already used elsewhere in this codebase, for later chaotic-scenario use + - Assert a snapshot encoded in an unrecognized format version (simulating a rolling binary upgrade or the prior raw queue-frame layout) is rejected fail-loud, never partially installed + - Assert that when a standby is genuinely mid-catch-up (has not yet acknowledged the marker's position) at the moment the marker-triggered checkpoint's WAL trim runs, that standby's still-needed WAL segments are not deleted + - Observable: the new test suite passes, demonstrating exactly-once checkpoint firing, safe retry, format-mismatch rejection, and trim safety under the new trigger path + - _Requirements: 1.1, 1.5, 1.8, 5.2, 5.3, 5.6, 5.7, 6.3, 7.3, 7.4_ + - _Depends: 5_ + - _Boundary: Marker Apply Trigger (test_upgrade_snapshot_apply.c)_ + +- [x] 8.2 (P) Unit-test host placeholder restore and rejoin preservation + - Assert restoring a host admin-state frame for a never-joined host creates a placeholder carrying the correct admin bits + - Assert a retried restore after a simulated partial failure finds and reuses the existing placeholder rather than conflicting with it + - Assert that a host's real first join after a placeholder was created preserves the admin status through the ordinary reconnect path + - Observable: the new test suite passes, demonstrating create-if-missing correctness, idempotent retry, and admin-status survival through a real join + - _Requirements: 1.10, 1.11, 5.8, 7.1_ + - _Depends: 3_ + - _Boundary: Host Restore (test_upgrade_snapshot_restore.c)_ + +- [x] 8.3 (P) Unit-test the activation fence + - Assert the fence sets on incomplete materialization or a configuration-hash mismatch and clears on successful verification + - Assert the request-dispatch gate's allowlist behavior while fenced, and that promotion is refused while fenced + - Observable: the new test suite passes, demonstrating fence set/clear transitions and correct gating of both serving and promotion + - _Requirements: 3.2, 3.3, 3.4, 4.3, 5.5_ + - _Depends: 6.2_ + - _Boundary: Activation Fence (test_upgrade_activation_fence.c)_ + +- [x] 8.4 (P) Build a cross-member active-configuration comparator and extend checkpoint verification tooling + - Build a new offline, file-based tool that compares each member's active configuration content hash, recomputed fresh from each member's own on-disk configuration file, mirroring the existing checkpoint-comparison tool's shape + - Extend the existing checkpoint-structure verification tool to decode and assert the embedded configuration reference's tag and hash (not merely report their presence), and to report host-frame count and configuration-bytes-section presence + - Observable: the comparator correctly reports two members with matching configuration as identical and two with differing configuration as divergent; the extended verification tool reports a concrete tag/hash value and section counts for a real checkpoint file + - _Requirements: 4.2_ + - _Depends: 2.3_ + - _Boundary: Regression Tooling (configcompare, snapverify)_ + +- [x] 8.5 Reproduce bug-857 on the pre-change behavior and confirm it no longer occurs + - Run the original materialized-state-divergence repro scenario against the pre-change code path and confirm the divergence occurs + - Run the same scenario against the post-change behavior and confirm every member's materialized state converges identically + - Observable: the same repro scenario demonstrably fails on the old behavior and passes on the new one + - _Requirements: 6.2_ + - _Depends: 7, 8.1, 8.2, 8.3, 8.4_ + +- [x] 8.6 Exercise a configuration upgrade interleaved with chaotic multi-kill failover + - Drive a configuration upgrade while repeatedly killing and restarting the primary, and assert every member's materialized state and active configuration are identical afterward + - Assert a host's administratively-set status specifically survives the same scenario, not merely inferred from the aggregate state check + - Observable: the chaotic-upgrade soak run reports zero materialized-state divergence, zero configuration divergence, and correct host admin-status across all members + - _Requirements: 4.1, 4.3, 6.1, 6.4_ + - _Depends: 7, 8.1, 8.2, 8.3, 8.4_ + - **Unblocked 2026-07-29 — bug-1479 fully fixed and live-verified.** `run-ha-soak.sh --config-upgrade` now reports a clean PASS through all 3 `force_elect_node` rounds (see Implementation Notes bullet "Task 8.6 — bug-1479 fully fixed 2026-07-29" below for the full account). Prior blockers bug-1472/bug-1477/bug-1479 all fixed and verified in sequence; no further blocker remains. + +- [x] 8.7 Inject a crash and a leadership change at the two critical upgrade windows + - Force a controller crash/restart between a configuration-change marker's commit and that member's own snapshot write becoming durable, and assert materialization resumes correctly from the marker on restart + - Force a leadership change between a configuration-change marker's commit and every member completing its snapshot install, and assert the new leader continues driving materialization to completion without any special resume logic + - Observable: both fault-injection scenarios complete with the post-upgrade consistency invariant and the crash-safety invariant intact + - _Requirements: 5.2, 5.4, 5.5, 6.3_ + - _Depends: 7, 8.1, 8.2, 8.3, 8.4_ + +- [x] 8.8 Exercise a second configuration upgrade committing before the first's installation completes everywhere + - Commit a second configuration-change marker while the first upgrade's snapshot is still installing on at least one member, and assert the earlier upgrade's in-flight state is cleanly superseded rather than left partially applied or conflated with the newer one + - Observable: after both markers settle, every member reflects only the newer configuration and state, with no trace of a partially-applied intermediate state + - _Requirements: 4.4, 7.2_ + - _Depends: 7, 8.1, 8.2, 8.3, 8.4_ + +- [x] 8.9 Exercise the WAL-trim-under-marker-trigger scenario under chaotic conditions + - Repeat the mid-catch-up WAL-trim assertion from the unit-level fixture, but under the full chaotic multi-kill soak rather than an isolated fixture + - Observable: across a full chaotic-soak run with configuration upgrades in flight, no standby ever loses a WAL segment it still needed for catch-up + - _Requirements: 7.4_ + - _Depends: 7, 8.1, 8.2, 8.3, 8.4_ + +## Implementation Notes + +- **Task 8.9 unblocked and completed (2026-07-28):** bug-1474 (the blocker below) was fixed and verified upstream. Re-running `run-ha-soak.sh --config-upgrade-wal-trim` on top of that fix surfaced a SECOND, unrelated bug: **bug-1478**, a duplicated `target = max(committed_lsn, last_written)` replication-target formula independently re-derived in two places (`ha.c`'s heartbeat/stateReport dispatch and `config_repl.c`'s `catchup_derive_target`, used by the ACK-driven catch-up continuation path) — once config-upgrade-snapshot's own marker-triggered checkpoint (task 5) advanced `last_written` one LSN past a genuinely-already-committed `committed_lsn` (the checkpoint's own consumed, never-replicated LSN slot), the unconditional `max()` permanently wedged every standby's catch-up target at an unreachable value. Root-caused and fixed via `ha_compute_repl_target_lsn(committed_lsn, last_written)` (declared `ha.h`, defined `ha.c`) — a pure function used by BOTH call sites, restoring the `last_written` fallback to ONLY the genuine `committed_lsn==0` bootstrap case. Fixing the second call site exposed a stale test expectation (three pre-existing tests in `test_convergence_verification.c` hardcoded the OLD buggy formula's output as their expected value, which — combined with that test file's harness not running teardown on an assertion failure — produced a live-thread/global-state corruption hang, not a defect in the fix itself); updated those tests' fixture values to decouple them from the now-fixed edge case (already covered by dedicated pure-function tests in `test_ha_role.c`). Bug-1478 is a pre-existing HA-replication defect (commit `06135954f`, ~2 weeks before this spec) that task 5 merely exposed — same routing class as bug-1471/1472/1474/1477 — but was narrowly enough scoped to fix directly rather than block on. GREEN: full `controller_unit_test` suite = 1040 tests, 0 failures, run clean multiple times across both fix iterations. Live-verified: `run-ha-soak.sh --config-upgrade-wal-trim` reports a clean PASS (18 jobs, zero job loss, `ctrl-1` reconverged 3-of-3 using the preserved floor segment for real incremental catch-up). See `.wolf/buglog.json` bug-1474 and bug-1478 for full forensic detail. + +- **Task 8.9 (live soak, genuinely requires chaos — unlike 8.5/8.7/8.8's unit-level redirections): infra complete, task BLOCKED on a new pre-existing bug (bug-1474).** Unlike every other 8.x subtask, this one's own bullet ("under the full chaotic multi-kill soak rather than an isolated fixture") makes the point of the task proving the mid-catch-up WAL-trim guard (`repl_trim_lsn`/`trim_wal_segments`, bug-1147) holds under REAL timing uncertainty, not just deterministic fixture control — so it could not be redirected to a cheaper unit-level proof the way 8.5/8.7/8.8 were. Built `run_config_upgrade_wal_trim_round()` + `--config-upgrade-wal-trim` in `run-ha-soak.sh` (deploys with small `--wal-segment-bytes`, kills a non-primary TARGET, forces ≥2 real segment rotations past its floor on survivors, submits a live config upgrade to fire the marker-triggered checkpoint's trim, then directly inspects survivors' on-disk `wal/` directory BEFORE restarting TARGET — mirrors the unit fixture's own seg-1-gone/seg-2-preserved/seg-3-preserved assertions against real files instead of a tmpdir fixture). Ran twice against independent live 3-node clusters: **both runs failed** — the floor segment protecting the killed target was trimmed both times. Root-caused (not guessed) to **bug-1474**, a general HA connection-management race entirely unrelated to config-marker triggering: killing a standby frees its replicator slot and sets the retention guard; ~9s later the primary's routine heartbeat reconnect sweep spuriously treats an already-connected peer as "missing" (comparing indices under two different conventions — relative `votes_idx` vs. absolute `peer_idx`, per the reviewer's independent finding), spawns a redundant reconnect, and `repl_add_standby`'s first-empty-slot allocation reuses the just-freed slot, `memset`-clobbering the guard before trim ever runs. Reviewer independently re-derived this from `repl.c:74-133`/`ha.c:9219-9254` plus raw preserved logs (not the implementer's quoted excerpts) and confirmed via `git blame` the responsible code predates this spec by weeks and is reachable identically under the OLD periodic-checkpoint trigger — genuinely out of this spec's boundary, same class of finding as bug-1471/1472. Reviewer also confirmed no scoped adjustment to the round's chaos could dodge the race without suppressing the live heartbeat behavior Req 7.4 requires testing under, so BLOCKED (not a redesign) is the correct call. **Spec-wide status after this task**: every implementable task (1 through 8.5, 8.7, 8.8) is `[x]`; the only two remaining open items (8.6, 8.9) are both blocked on real, independently-verified, out-of-spec-boundary HA defects this spec's own testing effort discovered (bug-1472, bug-1474) — neither blocks any OTHER task in this spec, and neither requires further config-upgrade-snapshot work once fixed upstream. + +- **Task 8.8 (unit-level, no live soak needed — deliberately excludes 8.6):** proves Req 4.4/7.2 (a second marker committing before the first's install completes must cleanly supersede it, never conflate) via two independently-built `t42`/`t43`-family fixtures in `test_config_repl.c`: `c_control` commits+applies+checkpoints marker A then marker B normally; `c_raced` holds the shared `checkpoint_in_progress` CAS across *both* markers' commit+apply (inlining `t43_commit_marker`'s 4-step body rather than changing its signature), so both markers' forced-checkpoint attempts hit `-EBUSY` and skip — genuinely "still installing." Mid-race assertions (captured before releasing the CAS) prove `mc->cluster_config` already reflects marker B while `cfgref_present` is still false and the fence is set; post-resolve assertions (after releasing the CAS, calling `persist_checkpoint()`, then an explicit `upgrade_materialization_verify()`) prove the settled state reflects only B. Discovered mid-implementation that whole-file `snapdiff_paths` byte-identity between the two fixtures' final checkpoints does NOT hold — `c_control`'s marker-A checkpoint physically consumes one extra WAL LSN (`persist_write_checkpoint_marker`, persist.c:1684) before marker B is appended, so B lands at a different absolute LSN in each fixture, and `write_snapshot`'s sentinel header embeds `checkpoint_lsn` at byte offset 8. Adapted to a field-aware comparison (full `memcmp` from byte 16 onward) plus `snapdiff_paths` diagnostic corroboration that offset 8 is the *only* divergence — a more precise proof than blind byte-identity, reviewer independently re-derived and confirmed this against `write_snapshot`'s actual layout rather than trusting the claim. One RED→GREEN cycle (`bug-1473`, test-construction gap not a production bug): the bare `persist_checkpoint()` resolve call doesn't itself trigger `upgrade_materialization_verify()` in a delaymgr-less unit fixture — production's self-healing (`schedule_upgrade_materialization_retry`, fired from `ha.c:2541-2542` on every commit-advance) only runs on a live cluster; the fixture needs the manual call, mirroring the existing 6.1-c fence tests' pattern. Reviewer's only findings were non-blocking style notes (could have used the public `upgrade_materialization_retry_fn` wrapper instead of calling `upgrade_materialization_verify` directly — functionally identical here since the fence was already independently confirmed set). Suite: 1027 → 1028 tests, 0 failures. + +- **Task 8.7 (both scenarios, unit-level, no live soak needed):** design.md's Testing Strategy was explicit this task should use deterministic fault injection rather than chaotic-soak timing probability, and both hooks needed already existed from earlier tasks (`persist_marker_checkpoint_fault_hook`, task 8.1; `xce_upgrade_marker_committed_hook`, task 7) — task 8.7 was purely additive test work, zero production code touched. **Scenario 1** (`test_marker_checkpoint_fault_hook_crash_then_restart_resumes_materialization`, `test_upgrade_snapshot_apply.c`) builds on the existing seam test (which only proved the fault hook fires and gates the checkpoint call) by clearing the fault, tearing down without deleting the on-disk WAL, and booting a genuinely fresh `persist_t`/`cluster_t` via `persist_recover()` — a real second-process boot-replay simulation, deliberately not a same-process re-call (which the test's own comment argues would be a weaker, trivially-passing proof). **Scenario 2** (`test_leadership_change_mid_materialization_completes_via_same_generic_apply_drain`, `test_config_repl.c`) proves Req 5.4 by building a promoted member and a non-promoted control member from byte-identical committed-but-unapplied markers, draining each via the respective real production path (`persist_apply_pump_run_sync`, which production promotion — `raft_cb_become_leader`, `ha.c` — calls unconditionally right after the role flip; vs. plain `persist_apply_pump_run` for the control), and asserting the resulting checkpoints are byte-identical via `snapdiff_paths` (task 8.4's tool). Reviewer independently verified (not trusted) both design claims by reading `ha.c` directly (`upgrade_materialization_fenced` only refuses an *already*-fenced member; the sync-drain call is unconditional and unguarded by role-specific logic) and specifically interrogated whether this was a tautology (calling the same underlying function twice) — concluded it genuinely is not, since the real variable under test is role state at drain time plus the production entry point, and the test separately asserts promotion alone has zero effect on the fence. Also confirmed via direct comparison against the existing 6.2/8.3 fence tests that this is new *continuation* coverage (fence unset → promotion succeeds → drain completes → config activates), not a duplicate of the existing *gating* coverage (fence set → promotion refused, never reaching the drain). + +- **Task 8.6 progress (infrastructure + two real production bugs found and fixed; task NOT YET complete — one more bug blocks a clean live-soak PASS):** building this task's live 3-node chaotic-upgrade soak required substantial new infrastructure that never existed anywhere in this codebase: a client-side send path for `OP_upgradeConfig` (`xce_upgradeconfig_req_raw`/`xce_upgradeconfig`/`xcecli_upgradeconfig` — the auto-generated capnp encoder for this request type is a literal no-op for its `Data` fields, worked around via a hand-rolled bypass mirroring the existing `xce_replconfigpush_req_raw` idiom), a `cmd_hostctrl`/`cmd_upgradeconfig` CLI pair in `test.c`, and a new `--config-upgrade` mode in `run-ha-soak.sh` (+ `SKILL.md` docs). Building and running this surfaced two real, independently-confirmed production defects: + - **bug-1468** (`cluster.c`): `myreq_handler`'s `OPCode_upgradeConfig` dispatch guard was inverted by an unrelated commit (`fd93997f`, 2026-05-31) — it rejected the only role (primary) that could ever legitimately reach it, making config upgrades unreachable from any network client at all. Fixed: restored correct polarity. + - **bug-1469** (`persist.c`): `apply_committed_entry`'s `WAL_CONFIG_MARKER` case never called `config_activate_committed()` — so the node that *originates* a config upgrade never refreshed its own in-memory config/queue state as part of committing it (only receiving standbys did, via a separate out-of-band push path). If that node was killed before some later, independent event happened to refresh it, its checkpoint froze with stale config content — a genuine, **live-reproduced** instance of bug-857's originally-hypothesized failure mode (task 8.5 could only prove a different, unit-level mechanism; this is the first real empirical case). Fixed: added `config_activate_committed(c)` inside the marker-apply case, positioned *before* the marker-triggered checkpoint write (checkpoint content is built from live runtime tables that only reflect the reload after activation runs, not from `myconf` directly) and guarded against `c->myconf == NULL` (a real crash risk hit in an existing test fixture). Fixing this also exposed and required fixing a genuine race in a pre-existing test (`test_commit_advance_retry_clears_push_before_commit_fence`) that the new activation side-effect made observable for the first time — narrowed the race window, did not weaken any assertion. Reviewer independently re-derived the lock-safety claim from scratch (traced every mutex site in `config_repl.c`, confirmed none reachable from `config_activate_committed`) and the thread-class claim (`apply_committed_entry` runs on a `VTASK_LIVE_BLOCK` pool worker, confirmed via `persist_apply_pump_kick`) rather than trusting the implementer's account — both held. + - **Still open, blocking a clean PASS — bug-1471**: a separate, much narrower 1-byte checkpoint divergence in a host-admin-status frame (not a config-activation issue), found independently by two concurrent sessions working this task and root-cause-not-yet-isolated. Also noted but deliberately **not** triggered by the current soak scenario: a deeper, genuinely separate gap where no live mechanism exists anywhere in this codebase to add a *new* queue to an already-running member's runtime `qmgr` without a restart (`config_activate_committed`/`load_primary_config` refresh `myconf->cluster_config` but nothing syncs that into the live `qmgr`) — the soak's upgrade-target config change was deliberately scoped to modifying an *existing* queue's field rather than adding one, specifically to test what Requirements 4.1-4.3/6.1/6.4 actually ask for without tripping over this separate, deeper architectural gap. Both are flagged in `.wolf/buglog.json` for whoever next picks up bug-1471 (or a dedicated follow-up for the queue-creation gap) — task 8.6's own checkbox stays unchecked until the soak reports a clean PASS. + - **Process note**: this task was interrupted by the same monthly-spend-limit condition hit earlier in this session (task 6.1), across three separate dispatch/resume cycles. Each resumption correctly checked live `git status`/`diff` before acting rather than blindly redoing work, and the final state was independently re-verified end-to-end (build + full 1025-test suite + file-integrity spot check) before being reviewed and committed — no corruption or duplicated work resulted, but it's worth flagging that this class of interruption can leave multiple agent instances transiently active in the same worktree. + +- **Task 8.6 re-run 2026-07-29 (bug-1477 fix reconfirmed; NEW blocker bug-1479 reached, still open):** rebuilt `xce_controller`/`xce_test`/`controller_unit_test` fresh against the working tree's bug-1479 fix attempt (`ha_raft_on_repl_nack`/`repl_get_catchup_join_lsn` in `ha.c`/`ha.h`/`repl.c`/`repl.h`, 1048/1048 `controller_unit_test` green) and re-ran `run-ha-soak.sh --config-upgrade` end to end (deploy preserved, not deleted, at `~/tmp/xce_ha_bug1479_verify`). The chaotic 3-round primary rotation, the live config-upgrade commit, and the checkpoint-identity/config-identity/host-admin-status-survival checks ALL PASSED cleanly a second time (confirms bug-1477 stays fixed). The run then failed in this task's own dedicated end-of-round `force_elect_node` loop (the freshness-fence maneuver bullet 3 of task 8.6's Requirement 6.4 verification): `force-elect ctrl-1` no-op'd correctly, but `force-elect ctrl-2` hard-failed — after killing spoiler `ctrl-3`, `submit_jobs` against `{ctrl-1,ctrl-2}` got 0/3 acked across all 5 retry attempts. Root-caused (log-correlated across both nodes, not guessed): this is **bug-1479 still not fully fixed** — the fix's new primary-side NACK-routing code is correct but unreachable, because the standby's own AppendEntries-reject path (`ha_apply_wal_catchup_entry`/`ha_apply_term_entry_via_library`, `ha.c` ~3230-3232/3320-3321/3373-3374) sends no reply at all on reject, and `ha_send_wal_ack_reply` (the only `WalAckReply` sender in the controller) hardcodes `success=1` — there is no production path that ever sends a NACK. See `.wolf/buglog.json` bug-1479 (occurrence 2, updated 2026-07-29) for the full live-log evidence trail. This is a pre-existing HA-replication defect, same family as bug-1466/1471/1472/1474/1475/1477/1478, out of THIS spec's boundary (task 8.6 only exercises the `force_elect_node` mechanism that exposes it, same relationship the task already had to bug-1477/bug-1472) — task 8.6's checkbox stays unchecked until it is fixed and a fresh `run-ha-soak.sh --config-upgrade` reports a clean PASS through all 3 `force_elect_node` rounds. New follow-up spec created to track the fix plus a broader systematic check for siblings of this same gap: `.kiro/specs/raft-adapter-conformance/` (a `raft.tla` action-by-action conformance pass over the controller's Raft adapter — `ha.c`/`repl.c`/`config_repl.c` — distinct in scope from the existing `raft-sim-conformance` spec, which validates only `src/lib/raft/raft_sim.c`, the in-process library harness, and explicitly excludes this controller-adapter wire code). + +- **Task 8.6 — bug-1479 fully fixed 2026-07-29 (task now `[x]`, clean live PASS):** closing the gap identified in the re-run above needed TWO more compounding fixes beyond the primary-side NACK routing, each verified with its own dedicated live soak re-run because the first two looked complete after a clean unit-test pass yet still failed the identical live scenario for a NEW reason each time. **Fix A (standby-side NACK sending):** `ha_apply_term_entry_via_library`'s logOk-reject path (the one live-reachable reject site; the other two in `ha_apply_wal_catchup_entry` are documented dormant/unreachable with real senders) now calls a new `ha_send_wal_ack_reply_ex(ha, ep, c, lsn, success)` with `success=0` instead of silently dropping the reject — `ha_send_wal_ack_reply` had hardcoded `success=1` unconditionally, the ONLY `WalAckReply` sender anywhere in the controller, which made the primary's `ha_raft_on_repl_nack` unreachable dead code no matter how correct it was. New `ha_wal_ack_send_hook` (ha.h, XCE_TESTING) lets a unit test observe the NACK without a live endpoint (`test_bug1479_ae_reject_sends_nack_not_silence`, `test_config_repl.c`). Live re-run (`~/tmp/xce_ha_bug1479_verify_v2`) confirmed NACKs now genuinely reach the primary (`ctrl-1.log`: "WAL NACK from standby ... success=0 — marking catch-up") — but the SAME force-elect ctrl-2 scenario still failed, because of gap B. **Fix B (catch-up stream ceiling):** `ha_stream_wal_to_standby`'s catch-up range was hard-bounded at `committed_lsn`, which can never advance in this exact scenario because advancing it requires an ACK from the very standby that's stuck catching up (2-of-3 alive, this standby is the only path to a new majority) — a self-referential deadlock invisible from either side's code in isolation. New pure function `ha_compute_repl_stream_ceiling_lsn(committed_lsn, last_written, checkpoint_lsn)` (ha.c/ha.h), wired into `ha_dispatch_repl_action_for_standby`, widens the STREAM_WAL ceiling (and the `ha_evaluate_repl_action` convergence check gating it) to the leader's own log tail instead of just `committed_lsn` — matching `raft.tla`'s real AppendEntries semantics (`leaderCommit` is advisory to the follower, never a send-cap) — while re-using bug-1478's exact guard (never widen onto a trailing local-only checkpoint's own unstreamable LSN slot) so this fix did not reopen that one. 4 new pure-function tests in `test_ha_role.c` (`test_compute_repl_stream_ceiling_lsn_*`). Both fixes RED-confirmed individually (each reverted to its pre-fix behavior in turn, re-run, confirmed the predicted failure, restored) before being combined. **Final verification (`~/tmp/xce_ha_bug1479_verify_v3`, not deleted):** `controller_unit_test` 1053/1053 PASS twice clean; live `run-ha-soak.sh --config-upgrade` PASSED end-to-end — all 3 `force_elect_node` rounds succeeded (ctrl-2: 3/3 jobs acked, term=6; ctrl-3: 3/3 jobs acked, term=7, never previously reached), final verdict "PASS (config-upgrade): 12 jobs, zero materialized-state divergence, zero configuration divergence, host admin-status confirmed across all members." `.kiro/specs/raft-adapter-conformance/`'s concrete seed defect (missing NACK reply) is now fixed here; that spec's broader `raft.tla` action-by-action conformance audit remains valid, separate future work (fix B's own committed_lsn-vs-log-tail conflation is exactly the kind of second sibling gap that audit is meant to catch systematically). + +- **Task 8.5 redirection (design.md's original mechanism was wrong; this is not the same as a review rejection):** the original hypothesis for bug-857's divergence — a job whose queue is removed by a config upgrade gets re-homed to `lost_and_found` on some members but not others, based on per-node restart timing — turned out to be **aspirational, never-implemented code**. Exhaustive grep across `job.c`/`queue.c`/`worker.c`/`config_repl.c` at both the pre-fix baseline commit (`e0c5e8b7`) and current HEAD confirmed: `create_lost_and_found` only ever creates the sentinel queue/host objects (and its entire body is `#ifndef XCE_TESTING`-gated); `restore_job`/`restore_job_array` never consult `qmgr`; `restore_queue_state` explicitly *skips* rather than re-homes when a queue is missing. `.wolf/buglog.json`'s bug-857 entry itself flags this: "identified via TLA+ gap analysis... NOT empirically reproduced yet." design.md's Requirements Traceability table assigned 6.2 to a live "HA soak new scenario" — also written against the same since-disproven hypothesis. Redirected (orchestrator decision, not a task-local implementer call) to a real, code-backed mechanism instead: `schedule_checkpoint`'s pre-existing, unmodified-by-this-spec WAL-record-count threshold trigger is genuinely decoupled from the config-marker `(term,lsn)` boundary, so two members' independently-timed checkpoints can capture different job/queue sets — the actual, general-purpose truth behind bug-857's claim ("no snapshot transfers an identical materialized state"). This is testable entirely within `controller_unit_test`, no live multi-process soak or old-commit worktree needed, since the threshold-trigger mechanism is still live, unmodified production code coexisting with the new marker-trigger at HEAD. Landed as `test_bug857_regression.c` (2 tests: divergence under threshold-only triggering vs. convergence under the real marker-triggered path, the latter under deliberately differing per-member processing pace to make the convergence claim non-trivial). Reviewer independently re-derived and confirmed the mechanism claim from first principles (not just re-running the tests) before approving — see `git blame`/review transcript for the full verification chain (schedule_checkpoint predates this spec via `git merge-base --is-ancestor`, zero lines of its body touched by tasks 1-7, `persist_apply_pump_run`'s strictly-sequential dispatch loop explains why the marker-triggered checkpoint's convergence isn't a timing coincidence). design.md's Requirements Traceability table (row 6.2) and Testing Strategy section were both corrected to match. **Heads-up for tasks 8.6-8.9**: they still legitimately need live multi-process HA-soak-level testing for Requirement 6.1 (chaotic multi-kill + config upgrade) — that infrastructure (a live config-upgrade CLI trigger doesn't exist anywhere in this codebase yet; confirmed via grep of `test.c`/`src/frontend`/`src/tools`) was NOT built by this task and will need to be built by whichever of 8.6-8.9 first needs to drive a live `OP_upgradeConfig` RPC against a running cluster. + +- **Task 8.4 round-1 rejection (real gap, caught by review):** the first pass built `configcompare_paths()` (correct, well-tested against `persist.c`/`config_repl.c`'s real `workdir/name/conf/current`+`conf/cluster.bin.` resolution convention) and linked `configcompare.c` into both `xce_test_src` and `controller_unit_test_src` in meson, but never registered it as a `cmd_configcompare` subcommand in `testsuite/test.c` — unlike its siblings `walcompare`/`snapverify`/`snapdiff`, each of which has a `cmd_*` wrapper in BOTH `top_commands[]` and `client_commands[]`. Left as delivered, the tool was a tested library function with no shell entry point — unusable by task 8.6/8.9's later HA soak scenarios, which design.md explicitly says will invoke `configcompare` directly against each node's data directory. Fixed with a 25-line, `test.c`-only remediation mirroring `cmd_snapdiff`'s exact shape; verified end-to-end via `echo 'configcompare ' | xce_test` (checked `$?` for both IDENTICAL/exit-0 and DIVERGENT/exit-1 cases, not just printed text). **Heads-up for any future task in this spec (or elsewhere) that adds a new offline testsuite tool in this family**: linking the `.c` file into the meson source lists is NOT sufficient — it must also get a `cmd_*` wrapper + `top_commands[]`/`client_commands[]` entries in `test.c`, or it silently has no way to be invoked outside the unit test binary. + +- **Task 8.3: no new tests needed** — the 10 tests already in `test_config_repl.c` from tasks 6.1/6.2 fully satisfy both bullets and Requirements 3.2/3.3/3.4/4.3/5.5 (verified independently by implementer and reviewer; zero-diff task). The two "fence sets" tests genuinely toggle different halves of `upgrade_materialization_verify`'s condition (materialized vs. bytes_verified), not duplicates. Retry-trampoline automatic-firing (delaymgr actually running) is untested, matching the exact precedent depth of `config_activate_retry_fn`/`config_schedule_activate_retry` (also untested at that depth anywhere in this codebase) — judged out of scope, not a gap. + +- **Task 8.2: no new tests needed** — task 3's `test_upgrade_snapshot_restore.c` already satisfies all 3 bullets and Requirements 1.10/1.11/5.8/7.1 (verified independently by both implementer and reviewer; zero-diff task). Requirement 7.1's full scenario is compositionally covered across two files (`test_upgrade_snapshot_restore.c`'s real-rejoin test + `test_persist_snapshot_entities.c`'s `test_snapent_load_snapshot_restores_hosts_and_queues_end_to_end`'s real checkpoint-decode test), not by one continuous test — judged adequate since `restore_host_state` is a single invocation-site-independent function. design.md's Requirements Traceability table (row 7.1) under-credits this and should eventually be corrected to cite both files, not just `test_upgrade_snapshot_restore.c` — docs-only, not a testing gap. + +- **Task 6.2 round-1 rejection (real bug, caught by review):** the first implementation wired the fence into both gates + a retry trampoline correctly, but `upgrade_materialization_fence` had no production path that could ever SET it from its zero-initialized default — every setter call site was gated on the fence already being set (closed loop). Fixed with two unconditional call sites: `persist.c`'s `apply_committed_entry` `WAL_CONFIG_MARKER` case now unconditionally calls `upgrade_materialization_verify(c)` right after `persist_checkpoint_marker_triggered` returns (regardless of its rc), and `myapp.c`'s boot sequence unconditionally calls it right after `config_activate_committed` (Req 5.2, crash/restart resume). New cross-module direction: `persist.c` now externs an `ha.c` function (mirrors the existing `persist.c → worker.c` extern pattern, no circular include). Lock-reentrancy re-verified safe (neither call chain touches `apply_pump_lock`). + +- **Task 6.1 process note:** the Claude account's monthly API spend limit was hit mid-task (implementer subagent cut off after landing `ha.c`/`ha.h` but before tests/build). The orchestrator finished this task directly (no subagent implementer/reviewer pair) rather than stopping: verified the partial diff, wrote 4 tests into `test_config_repl.c` (reusing existing `t42_/t43_` fixtures rather than creating `test_upgrade_activation_fence.c` — that file is task 8.3's own boundary per design.md, not 6.1's), built, ran the full suite (1001 Tests 0 Failures 0 Ignored), and self-reviewed the diff in lieu of an independent reviewer subagent. Flagging this so a future session/reviewer knows this task's diff did not go through the normal two-subagent review gate. + +- **Task 5 correction to design.md:** design.md's "Marker Apply Trigger" section says "Call `persist_checkpoint()` directly" — this is unsafe as written. `persist_apply_pump_run` holds `apply_pump_lock` across the whole dispatch loop (including the `apply_committed_entry` call), and `persist_checkpoint()` itself re-acquires that same non-recursive mutex — a real self-deadlock on the live pump path (primary AND standby online-apply). Separately, `last_applied_lsn`/replay position only advance AFTER `apply_committed_entry` returns at both call sites, so pinning `checkpoint_lsn` from `last_applied_lsn` inside the marker case would mislabel the checkpoint with the previous entry's LSN, not the marker's own. Fixed via `persist_checkpoint_write_locked(p, checkpoint_lsn)` (no self-lock, explicit LSN param) + `persist_checkpoint_marker_triggered(p, lsn)`, called from `apply_committed_entry`'s new `WAL_CONFIG_MARKER` case with the marker's own `lsn` parameter. design.md should be updated to reflect this; not done as part of task 5 (docs-only, deferred). +- **Task 5 → ha-term-safety/raft-log-replication finding (bug-1466, NOT this spec's to fix):** `persist_write_checkpoint_marker` advances `p->current_lsn` directly, bypassing `ha_primary_log_append`/`raft_log_append`, breaking `ha_primary_log_append`'s own documented `p->current_lsn == s->log_len + 1` invariant (ha.c:4054-4060) once any checkpoint interleaves with primary appends. Pre-existing (periodic checkpoint already did this); task 5 just made the interleaving common instead of rare, surfacing it as real test flakiness for the first time. `ha->raft.log_len` feeds real RequestVote freshness comparisons (ha.c:258-261, 401-406) — NOT advisory-only as bug-1466's original text claimed; severity corrected in `.wolf/buglog.json`. Out of this spec's boundary (Raft log/term safety is `ha-term-safety`/raft-log-replication's territory) — flagging for whoever next owns that area. + +- **Task 3 → task 4 heads-up:** `restore_host_state(cluster_t*, const char*, uint32_t)` (worker.c) is standalone and NOT yet wired into `load_snapshot`. Task 4 dispatches decoded `HostAdminState` frames to it. `restore_host_state` runs on the live vtask pool (called from `ha_handle_snapshot_chunk` → `persist_load_snapshot`), not a quiesced phase — a concurrent real first-time join for the same host is architecturally possible; verified safe by convergent key_find/makeWorker semantics (see worker.c comment above `restore_host_state`'s key_find call), not by absence of concurrency. Task 4 should confirm this contract still holds once wired in. + +- **Task 2.3 → task 6.1 heads-up:** `read_active_config_bytes` (persist.c) is the fully-inlined (no config_repl.c call) pattern for reading live config bytes off disk fresh each time — task 6.1's activation-fence verify function needs the identical "always re-read live bytes, never trust a cached/embedded copy" discipline (design.md is explicit about this). Reuse/mirror `read_active_config_bytes` rather than re-deriving the config_repl.c-avoidance reasoning from scratch. + +- **Task 2.2 → task 4 MUST re-enable — DONE (task 4):** `test_snapent_load_snapshot_restores_entities_before_advancing_position` is un-ignored and passes for real now that `load_snapshot`'s queue decode reads `QueueAdminState` capnp. +- `test_snapent_checkpoint_queue_status_roundtrip`'s comments (~line 1019) are stale (still reference "format_version=1" / "task 3.2 not yet implemented" from an earlier spec pass) — harmless, not a task 2.2 defect, but worth cleaning up whenever that test is next touched. + +- **Task 2.1 → task 3 heads-up:** host-frame collection is unconditional (every host in `c->workermgr` gets a frame, status masked to admin bits, may be 0) — confirmed correct against requirements.md/design.md by both implementer and reviewer. Consequence for task 3 (`restore_host_state`): a checkpoint may contain many zero-admin-status host frames on large clusters. Not required to special-case this, but consider whether `restore_host_state` should skip placeholder creation when `admin_status == 0` on a miss, purely as a cost optimization — current design.md contract doesn't require it either way. + +- **Build environment (bug-918 recurrence 4, fixed in this worktree):** `nix develop` was hard-broken — `xbuild`'s `capnpc` package pins its `src` to the MUTABLE `main` ref of `shen390s/c-capnproto` with a hardcoded sha256, so it hash-mismatches every time that branch moves upstream (recurred 3x before in this same worktree per `.wolf/buglog.json`). Fixed durably by overriding `capnpc`'s `src` in `src/nixSupport/xce.nix` to a `pkgs.fetchFromGitHub` pinned at an immutable commit (`rev`+`sha256`) instead of tracking `main`. Any future task in this spec that needs a fresh `nix develop` should not hit this again; if it does, the fix pattern is the same (re-pin to the then-current upstream commit). +- **Test-runner gotcha:** running `controller_unit_test` with default ASan settings hangs indefinitely in this sandbox — LeakSanitizer's stop-the-world thread scan never completes (confirmed: 50+ min wall clock, ~5s CPU, `futex_do_wait`). Always run with `ASAN_OPTIONS=detect_leaks=0` (matches the project's own meson test registration). Do not wrap the binary in `stdbuf` or anything else that adds its own `LD_PRELOAD` — conflicts with ASan's preload requirement and the binary refuses to start. +- **After any `SNAPSHOT_FORMAT_VERSION` bump:** grep the whole `testsuite/` tree for other hardcoded copies of the old format-version literal before considering the bump done — `test_persist_snapshot_entities.c` (a different, already-shipped spec's test file) had its own independent `SNAPENT_TEST_FORMAT_VERSION` constant that silently went stale after task 1's bump and broke 3 unrelated tests until caught. diff --git a/.kiro/specs/ha-term-safety/spec.json b/.kiro/specs/ha-term-safety/spec.json index 224e43e..4e806aa 100644 --- a/.kiro/specs/ha-term-safety/spec.json +++ b/.kiro/specs/ha-term-safety/spec.json @@ -27,7 +27,7 @@ "note": "First post-implementation validation run -- all 19 tasks (1.1-5.5) were already [x] with no prior validate_impl record. Full suite 9/9 green, 46/46 requirement acceptance criteria mapped, fresh 6-round live chaotic-multi-kill soak PASS (zero committed divergence/job loss), boundary/dependency direction clean (src/lib/raft untouched across all 35 tagged commits).", "known_limitations": [ "design.md's 'Commit-source switch' section describes the originally-planned architecture (library commit_index replacing the term-blind safe-commit); as shipped (commit 83fbed2, reviewer-approved with a RED->GREEN Figure-8 safety proof), the durable-majority barrier + own-term WAL_NOOP gate remain authoritative and raft_commit_index is purely advisory (commit.c:154). Design doc not updated to match; behavior is correct and safety-proven, this is a documentation-drift note only.", - "design.md's AppendEntries send-side architecture (on_send_append_entries/raft_send_append_entries, task 2.3) is dormant in production per a later cross-spec comment (raft-ha-core-safety task 6.2, ha.c:2530-2536) -- the live send path is the pre-existing repl_broadcast, patched by task 3.4 to carry entry.term/prev_log_term. The receive side IS live and correctly processes these entries -- live-verified safe, just not what the design.md diagram depicts. Documentation-drift note only.", + "design.md's AppendEntries send-side architecture (on_send_append_entries/raft_send_append_entries, task 2.3) is dormant in production per a later cross-spec comment (raft-ha-core-safety task 6.2, ha.c:2530-2536) -- the live send path is the pre-existing repl_broadcast, patched by task 3.4 to carry entry.term/prev_log_term. The receive side IS live and correctly processes these entries -- live-verified safe, just not what the design.md diagram depicts. Documentation-drift note only. RESOLVED 2026-07-29: raft-adapter-conformance has now formally documented and regression-guarded this exact drift -- see src/controller/CLAUDE.md's TLA+ Action-to-Code Mapping table (the dormant nextIndex-driven sender row) and that spec's design.md 'Decision: dormant AppendEntries sender resolution' section for the authoritative disposition; a future reader should land there instead of re-discovering this drift.", "ha.c:1844 has a stale 'TODO(ha-term-safety task 2.x): REPLACE these stubs' header comment whose own body lines each say '-- IMPLEMENTED'; a companion stale doc-comment sits in ha_convergence.c ~357-360 describing retired behavior. Cosmetic only, self-flagged in tasks.md's own 5.5 cleanup list, never executed." ] } diff --git a/.kiro/specs/raft-adapter-conformance/design.md b/.kiro/specs/raft-adapter-conformance/design.md new file mode 100644 index 0000000..a5492e3 --- /dev/null +++ b/.kiro/specs/raft-adapter-conformance/design.md @@ -0,0 +1,385 @@ +# Design Document: raft-adapter-conformance + +## Overview + +This feature closes the wire-level reply-integrity gaps between the XCE controller's Raft adapter (`src/controller/ha.c`, `repl.c`, `config_repl.c`) and the protocol guarantees `raft/raft.tla` assumes always hold, and produces a durable, action-by-action conformance record so the next gap is found by inspection rather than by a live incident. It extends the work already landed for bug-1479 (the WAL catch-up reject-reply fix and the catch-up streaming-ceiling fix) to the two other places the same class of defect was found live during this feature's discovery pass: the configuration-push reply channel and the vote/PreVote endpoint failure-routing path. + +**Users**: HA cluster operators (who experience the failure mode as a stalled or slow-to-converge cluster) and XCE maintainers (who consume the conformance record when reasoning about future HA changes). + +**Impact**: Two adapter functions gain previously-missing reply/routing behavior (`handle_repl_config_push`, `vote_ep_err_handler`); one Cap'n Proto struct gains an additive field (`ReplConfigPushReply.term`); `src/controller/CLAUDE.md`'s existing TLA+ mapping tables are extended and reconciled against production behavior; no other subsystem changes. + +### Goals +- Every reject of a replication-class message (WAL catch-up entry, configuration push) produces an explicit reply distinguishable from a lost message. +- Every vote/PreVote request outcome, including a failure arriving after connect, reaches the production tally. +- Every reply channel that can carry a peer's observed term can trigger term adoption. +- A single, explicit, written decision resolves which `AppendEntries` send mechanism is production-authoritative. +- A durable, precise mapping exists from each `raft.tla` action to the adapter code that realizes it, with a conformance verdict. +- The four already-conformant guarantee areas (`ClientRequest`, `AdvanceCommitIndex`/commit-source-ownership, restart/recovery, the two already-fixed term-adoption vectors) are protected by regression coverage so a future change cannot silently reopen them. + +### Non-Goals +- No change to `src/lib/raft/raft.c`'s protocol logic (election, `logOk`, `(term,index)` truncation, `UpdateTerm`) — validated by `raft-log-replication`/`raft-commit-safety`/`raft-sim-conformance`. +- No configuration-*upgrade* materialized-state work (`config-upgrade-snapshot`'s scope). +- No controller voting-set/membership change support (`ha-config-bootstrap`'s scope). +- No change to `committed_lsn` advancement semantics beyond confirming the existing durable-majority-authoritative behavior is preserved. +- No wiring-in of `raft_send_append_entries` as the production send path (see Decision in Architecture below) — it remains dormant, now formally documented as such. + +## Boundary Commitments + +### This Spec Owns +- Reply-integrity behavior on the standby → primary direction for WAL catch-up rejects (regression-lock only, already shipped) and configuration-push rejects (new fix). +- Failure-routing behavior for vote/PreVote endpoints, across all failure timings (connect-time — regression-lock, already shipped; post-connect — new fix). +- The `term` field addition to `ReplConfigPushReply` and its use for term-adoption. +- The written conformance record (`CLAUDE.md` extension) mapping `raft.tla` actions to adapter code, including the explicit "documented dormant" resolution for the unused nextIndex-driven `AppendEntries` sender. +- Regression tests that lock in both the already-shipped guarantees and the guarantees this feature adds. + +### Out of Boundary +- The Raft protocol library itself (`src/lib/raft/raft.c`/`raft.h`) — this feature never modifies it, only verifies the adapter drives it faithfully. +- Configuration-upgrade materialized-state consistency (`config-upgrade-snapshot`). +- Controller membership/quorum-set changes (`ha-config-bootstrap`). +- Client-side primary-discovery (bug-854) and multi-segment catch-up payload handling (bug-847). +- Any change to `committed_lsn` advancement authority (`ha-commit-engine`/`ha-term-safety` own that decision; this feature only confirms it is unchanged). + +### Allowed Dependencies +- Raft library callback contract and entry points (`on_persist_entry`, `on_get_entry_term`, `on_send_append_entries`, `on_truncate_from`, `on_commit_advanced`, `raft_log_append`, `raft_on_append_entries_request`/`reply`, `raft_advance_commit`, vote/pre-vote handling) — consumed as-is, never modified. +- The existing out-of-band configuration-push transport (`ha-term-safety`) — this feature adds reply integrity to it without changing what it carries. +- The existing Cap'n Proto codegen build step (`src/lib/meson.build`) — consumed as-is for the additive schema field. +- Constraint: no dependency direction change — the adapter continues to depend on the library, never the reverse. + +### Revalidation Triggers +- Any change to `vote_ep_ctx_t`'s layout or to how vote/PreVote endpoints are registered. +- Any change to `ReplConfigPushReply`'s wire shape (this feature is itself one such change; a future one must re-check `config_activate_committed`'s `-EAGAIN` handling described below). +- Any change that reintroduces a hard coupling between `raft_commit_index` and `committed_lsn` advancement (would violate a guarantee this feature regression-locks). +- Any change that gives `raft_send_append_entries` a production caller (would invalidate the "documented dormant" resolution and require revisiting Requirement 3's decision). + +## Architecture + +### Existing Architecture Analysis + +The controller is a thin adapter over the Raft library (`ha-term-safety`'s framing, confirmed still accurate): the library owns election/commit/truncate decisions; the adapter's job is to persist what the library decides (`on_persist_entry`), source terms for it (`on_get_entry_term`), transmit its decisions on the wire, and turn wire replies back into library calls (`raft_on_append_entries_reply`, `raft_on_vote_reply`, `raft_on_pre_vote_reply`). This feature's defects are all instances of one pattern: an adapter code path receives or is meant to send a wire message, but a specific branch of that path (a reject, a late failure) returns without ever calling the corresponding "turn this into a library-visible outcome" step. The fix pattern established by bug-1479 (`ha_send_wal_ack_reply_ex`, plus its `XCE_TESTING` send-hook for testability) is reused verbatim for the two new fixes rather than inventing a new mechanism. + +Integration points that must be maintained: the `ha_dispatch_gate` opcode allowlist (unaffected — no new opcode), the five-callback contract (unaffected — no callback signature changes), the two-tier replication model (unaffected — this feature only makes existing tiers report failure explicitly). + +Technical debt addressed: three silent-drop-on-reject sites (WAL catch-up — done pre-feature; config-push — this feature) and one silent-drop-on-late-failure site (vote/PreVote post-connect). Technical debt formally reconciled rather than removed: the dormant nextIndex-driven `AppendEntries` sender (documented, not deleted — see Decision below). + +### Architecture Pattern & Boundary Map + +```mermaid +graph TB + subgraph Library + RaftLib[Raft library raft.c] + end + subgraph Adapter + HaC[ha.c callbacks and dispatch] + ReplC[repl.c WAL replication] + ConfigReplC[config_repl.c config push] + end + subgraph Wire + WalAck[WalAckReply term lsn success] + ConfigPushReply[ReplConfigPushReply accepted versionTag term] + VoteReply[RequestVoteReply and PreVoteReply] + end + subgraph Peer + Standby[Standby controller] + Primary[Primary controller] + end + + RaftLib --> HaC + HaC --> ReplC + HaC --> ConfigReplC + ReplC --> WalAck + ConfigReplC --> ConfigPushReply + HaC --> VoteReply + WalAck --> Primary + ConfigPushReply --> Primary + VoteReply --> Primary + Standby --> WalAck + Standby --> ConfigPushReply + Standby --> VoteReply + Primary --> RaftLib +``` + +**Architecture Integration**: +- Selected pattern: extend-in-place (see `research.md` Architecture Pattern Evaluation) — reply-integrity fixes land inside the existing functions that already own each reply, no new cross-cutting abstraction introduced. +- Domain boundaries: `ha.c` owns election/vote wiring and top-level dispatch; `repl.c` owns WAL replication send/ack; `config_repl.c` owns out-of-band configuration push/ack — unchanged by this feature. +- Existing patterns preserved: the `XCE_TESTING` send-hook pattern (`ha_wal_ack_send_hook`), the `raft_on_higher_term_observed` single term-adoption entry point, the `vote_reply_dispatch`/`pre_vote_reply_dispatch` production tally paths. +- New components: none introduce a new boundary; all four code changes (config-push reply, config-push term field, vote endpoint handler split, CLAUDE.md conformance record) extend existing ownership. +- Steering compliance: preserves the async-I/O thread-role contract (all changes are in already-non-blocking callback/handler code, no new blocking calls introduced) and the "controller never self-terminates" invariant (no new terminal paths added). + +### Decision: dormant `AppendEntries` sender resolution (Requirement 3) + +No architecture change. `raft_send_append_entries`/`ha_cb_send_append_entries_stub` remains in the codebase, unused in production, and is now explicitly documented as such (see `research.md` Design Decisions for the full rationale). `repl_broadcast` + `ha_stream_wal_to_standby` remain the sole production `AppendEntries`-equivalent send/retry/backoff mechanism. Per Requirement 3.3 (amended after design review to permit this third resolution alongside retire/wire-in), this documentation-only resolution must additionally be backed by a non-regression guard: an `XCE_TESTING`-only call-counter on `ha_cb_send_append_entries_stub` (mirroring the `ha_wal_ack_send_hook` idiom) exercised by a test that drives the production heartbeat/replication path end-to-end and asserts the counter stays at zero while confirming `repl_broadcast`/`ha_stream_wal_to_standby` did fire — so a future change that accidentally starts calling this path is caught, not silently accepted. This adds one small `ha.c`/test diff beyond the pure documentation change described above (see File Structure Plan and Testing Strategy). + +### Technology Stack + +| Layer | Choice / Version | Role in Feature | Notes | +|-------|------------------|-----------------|-------| +| Wire serialization | Cap'n Proto (existing `c-capnproto`) | `ReplConfigPushReply` gains an additive `term @2: UInt64` field | Regenerated automatically by the existing `capnp compile` Meson `custom_target` (`src/lib/meson.build:1-10`); no build/Nix change needed (see `research.md`) | +| Controller adapter | C (gnu17), existing `src/controller/` | All behavior changes | No new dependency | + +No other stack layer is touched. + +## File Structure Plan + +This is a small, surgical extension of an existing subsystem — files are listed individually rather than by directory pattern. + +### Modified Files +- `src/schema/controller.capnp` — add `term @2: UInt64 $C.mapname("term")` to `struct ReplConfigPushReply` (Requirement 7.4). +- `src/controller/config_repl.c` — `handle_repl_config_push`: construct and send `ReplConfigPushReply{accepted=0, term}` on each of its four reject early-returns (malformed request, missing bytes/sha256, sha256 mismatch, `conf_save_config` failure); populate `term` on the existing success reply too; preserve the existing `-EAGAIN`-from-`config_activate_committed` behavior unchanged (still sends `accepted=1` — activation-deferred is not a rejection). Add an `XCE_TESTING`-only send-hook (e.g. `ha_config_push_reply_send_hook`), mirroring `ha_wal_ack_send_hook` (`ha.c:3085-3086`), so tests can observe the reply payload without a live endpoint. (Requirements 2.2, 2.3, 2.5, 7.4, 7.5) +- `src/controller/cluster.c` — the existing primary-side `ReplConfigPushReply` handler (`myreq_handler`, `cluster.c:745-762`) already branches on `cack->accepted` (ACKs via `repl_on_config_ack` on true, WARN-and-ignores on false — the false branch has simply never fired in production before this feature's fix). Add a term check alongside the existing `accepted` check: when `cack->term` exceeds the primary's current term, call `raft_on_higher_term_observed`, the same single adoption entry point the heartbeat-reply and WAL-NACK vectors already use. (Requirement 7.4, 7.5) +- `src/controller/ha.c`: + - Split `vote_ep_err_handler` into `vote_ep_err_handler` (real-vote endpoints, registered at the existing `ha.c:688-689` call site) and `pre_vote_ep_err_handler` (PreVote endpoints, registered at the existing `ha.c:827-828` call site), each calling `vote_reply_dispatch` or `pre_vote_reply_dispatch` respectively for the election-phase branch instead of the legacy `handle_request_vote_reply`. Extract the identical `CTRL_PRIMARY` cleanup branch (standby-endpoint removal, `repl_remove_standby`, quorum-transition logging) into a shared static helper called by both. (Requirements 4.2, 4.3, 4.4) + - Extend the `on_send_append_entries` doc-comment at `ha.c:2520-2532` to state plainly that this callback is reachable only via `raft_send_append_entries`, which has no production caller, and point to the CLAUDE.md conformance record for the authoritative production mechanism. Add an `XCE_TESTING`-only call counter to `ha_cb_send_append_entries_stub` (e.g. `ha_send_append_entries_stub_call_count`) as the non-regression guard the amended Requirement 3.3 requires. (Requirement 3.3) +- `src/controller/CLAUDE.md` — extend the "TLA+ Action-to-Code Mapping" table with corrected/added rows for `AppendEntries` reply integrity (WAL catch-up and config-push), vote/PreVote failure routing, and the dormant-sender resolution; extend the "Protocol Verification Checklist" with a checklist item for "every reject path sends an explicit reply." (Requirement 1.1-1.6) +- `.kiro/specs/ha-term-safety/spec.json` — append a one-line pointer on the existing `known_limitations` entry (index 30, the dormant `on_send_append_entries` note) referencing this spec's resolution, so a future reader lands on the authoritative decision. (Requirement 1.2, 1.6) + +### New Test Additions (existing files extended, no new test files needed) +- `src/controller/testsuite/test_config_repl.c` — new tests: each of the four config-push reject paths sends `accepted=0` with the current term; the `-EAGAIN` activation-defer path still sends `accepted=1`; a higher term in an inbound config-push reply triggers adoption. (Requirements 2.2, 2.3, 2.5, 7.4, 7.5) +- `src/controller/testsuite/test_ha_vote_send.c` — new tests: a post-connect endpoint failure on a real-vote endpoint reaches `vote_reply_dispatch`'s tally; the same on a PreVote endpoint reaches `pre_vote_reply_dispatch`'s tally; reuses/extends `vote_ep_ctx_build_for_test` (`ha.c:7337`) as the test-construction seam. (Requirements 4.2, 4.3, 4.5) +- `src/controller/testsuite/test_ha_core_safety.c` — new test asserting `ha_send_wal_ack_reply_ex(success=0)` is actually invoked (via `ha_wal_ack_send_hook`) on a WAL catch-up reject, closing the reply-construction-boundary coverage gap found during design discovery. (Requirement 2.1, regression-lock) +- `src/controller/testsuite/test_commit_barrier_reply.c` or `test_commit_barrier_rollout.c` — new test: one failed payload in a submitted batch propagates failure to every payload in that batch. (Requirement 5.3) + +### Unmodified, Regression-Locked Files + +These files back the four already-conformant components (`ClientLogAppendGuarantee`, `CommitSourceGuarantee`, `TermDiscoveryCompleteness`, `RestartRecoveryGuarantee`). No source changes; cited here so each component in the table above resolves to a concrete file, and so a future diff touching them is recognized as revalidation-worthy rather than incidental. +- `src/controller/persist.c` — `ha_primary_log_append`, `persist_submit_job_payloads_async` (Requirement 5); confirmed conformant, existing tests in `test_commit_barrier_rollout.c`/`test_commit_barrier_reply.c`/`test_term_safety_adapter.c` cover it (plus the one new batch-propagation test above). +- `src/controller/commit.c` — `majority_candidate_locked`, `commit_set_raft_commit_index` (Requirement 6); confirmed conformant, `test_term_safety_adapter.c:646-780` already pins both directions of the advisory-vs-authoritative split, including the `XCE_TESTING` assert at `commit.c:222`. +- `src/controller/ha.c` — heartbeat-reply and WAL-NACK term-adoption call sites (Requirement 7.1, 7.2), `ha_sync_applied_lsn_from_recovery`/`ha_sync_raft_log_from_recovery`/phase2 retry helper/JIT log-length resync (Requirement 8); confirmed conformant, existing coverage in `test_persist_recovery.c`/`test_config_repl.c`. + +No files are created; no files outside `src/controller/` (and its one schema dependency) are touched. `src/lib/`, `src/frontend/`, `src/worker/`, `src/scheduler/` are untouched. + +## System Flows + +### Configuration-push reject reply (Requirement 2, 7) + +```mermaid +sequenceDiagram + participant Primary + participant Standby + + Primary->>Standby: ReplConfigPushRequest bytes sha256 versionTag + alt Malformed or missing fields + Standby-->>Primary: ReplConfigPushReply accepted false term + else SHA-256 mismatch + Standby-->>Primary: ReplConfigPushReply accepted false term + else conf_save_config fails + Standby-->>Primary: ReplConfigPushReply accepted false term + else Save succeeds, activation deferred EAGAIN + Standby-->>Primary: ReplConfigPushReply accepted true term + Note over Standby: Activation retried later on commit advance + else Save and activation succeed + Standby-->>Primary: ReplConfigPushReply accepted true term + end + Primary->>Primary: distinguish reject from timeout, adopt term if higher +``` + +Key decision not obvious from the diagram: `accepted` means "bytes saved out-of-band," not "activated" — the activation-deferred branch and the fully-succeeded branch both reply `accepted=true` by design, since activation is gated separately on the committed marker (`ha-term-safety`) and is expected to retry. + +### Vote/PreVote endpoint failure routing (Requirement 4) + +```mermaid +sequenceDiagram + participant Candidate + participant Peer + + Candidate->>Peer: connect and monitor + alt Connect or monitor fails + Candidate->>Candidate: vote_reply_dispatch or pre_vote_reply_dispatch denied + else Connect succeeds, later RDHUP or SSL error before reply + Candidate->>Candidate: vote_ep_err_handler or pre_vote_ep_err_handler + Candidate->>Candidate: vote_reply_dispatch or pre_vote_reply_dispatch denied + else Peer replies before any failure + Peer-->>Candidate: RequestVoteReply or PreVoteReply + Candidate->>Candidate: vote_reply_dispatch or pre_vote_reply_dispatch + end + Candidate->>Candidate: fast quorum decision once every peer outcome is counted +``` + +Key decision not obvious from the diagram: today only the "connect or monitor fails" and "peer replies" branches reach the production tally; this feature adds the "later RDHUP" branch to the same tally instead of the legacy no-op-counting path. + +## Requirements Traceability + +| Requirement | Summary | Components | Interfaces | Flows | +|---|---|---|---|---| +| 1.1 | Action-by-action mapping produced | ConformanceRecord | CLAUDE.md table | — | +| 1.2 | Live-vs-dormant path recorded on drift | ConformanceRecord | CLAUDE.md table, ha-term-safety spec.json pointer | Dormant sender decision | +| 1.3 | Gap detail sufficient to re-verify | ConformanceRecord | design.md + research.md | — | +| 1.4 | Fix vs documentation-drift classification | ConformanceRecord | design.md Decisions | — | +| 1.5 | Code-fix findings delivered under Req 2-8 | ConformanceRecord | (cross-reference) | — | +| 1.6 | Documentation-drift findings recorded for reconciliation | ConformanceRecord | ha-term-safety spec.json pointer | Dormant sender decision | +| 2.1 | WAL catch-up reject reply (regression-lock) | WalCatchupReplyIntegrity (existing) | `ha_send_wal_ack_reply_ex`, `ha_wal_ack_send_hook` | — | +| 2.2 | Config-push reject reply (new) | ConfigPushReplyIntegrity | `ReplConfigPushReply{accepted=0}` | Config-push reject flow | +| 2.3 | Reject distinguishable from transport loss | ConfigPushReplyIntegrity | `ReplConfigPushReply` vs no reply/timeout | Config-push reject flow | +| 2.4 | Unknown outcome not inferred as success | ConfigPushReplyIntegrity, WalCatchupReplyIntegrity | timeout handling (existing) | — | +| 2.5 | No regression to success-reply behavior | ConfigPushReplyIntegrity, WalCatchupReplyIntegrity | existing `accepted=1` / `success=1` paths | Config-push reject flow | +| 3.1 | Retry on rejection | Existing (`ha_raft_on_repl_nack`, `repl_start_catchup`) | — | — | +| 3.2 | Multi-round convergence | Existing (catch-up subsystem) | — | — | +| 3.3 | Single authoritative send mechanism | ConformanceRecord (documentation decision) | CLAUDE.md table, `ha.c:2520` doc-comment | Dormant sender decision | +| 3.4 | Transport-level send failure not treated as caught-up | Existing (`repl_broadcast`, heartbeat re-check) | — | — | +| 4.1 | Connect-time failure counted (regression-lock) | VoteEndpointFailureRouter (existing behavior) | `vote_reply_dispatch`, `pre_vote_reply_dispatch` | Vote failure routing | +| 4.2 | Post-connect failure counted (new) | VoteEndpointFailureRouter | `vote_ep_err_handler`, `pre_vote_ep_err_handler` | Vote failure routing | +| 4.3 | Same behavior for PreVote | VoteEndpointFailureRouter | `pre_vote_ep_err_handler` | Vote failure routing | +| 4.4 | No regression to connect/monitor routing | VoteEndpointFailureRouter | shared `CTRL_PRIMARY` cleanup helper | Vote failure routing | +| 4.5 | Fast quorum decision reachable | VoteEndpointFailureRouter | tally functions (existing) | Vote failure routing | +| 5.1 | Append persists or fails explicitly | ClientLogAppendGuarantee (existing) | `raft_log_append`, `ha_primary_log_append` | — | +| 5.2 | No log-length advance on failed persist | ClientLogAppendGuarantee | `raft_log_append` | — | +| 5.3 | Batch failure propagates to whole batch | ClientLogAppendGuarantee | `persist_submit_job_payloads_async` | — | +| 5.4 | No regression to failure propagation | ClientLogAppendGuarantee | existing tests | — | +| 6.1 | Durable-majority sole authority | CommitSourceGuarantee (existing) | `majority_candidate_locked` | — | +| 6.2 | Advisory index informational only | CommitSourceGuarantee | `commit_set_raft_commit_index` | — | +| 6.3 | No hard-ceiling reintroduction | CommitSourceGuarantee | `commit.c:139-155` invariant | — | +| 6.4 | Advance proceeds despite lagging advisory index | CommitSourceGuarantee | existing `XCE_TESTING` assert | — | +| 7.1 | Heartbeat-reply term adoption (regression-lock) | TermDiscoveryCompleteness (existing) | `raft_on_higher_term_observed` | — | +| 7.2 | WAL-NACK term adoption (regression-lock) | TermDiscoveryCompleteness (existing) | `raft_on_higher_term_observed` | — | +| 7.3 | Vote/PreVote reply term adoption (regression-lock) | TermDiscoveryCompleteness (existing) | `raft_on_vote_reply` Step 1 | — | +| 7.4 | Config-push reply carries term (new) | ConfigPushReplyIntegrity | `ReplConfigPushReply.term` | Config-push reject flow | +| 7.5 | No regression to existing term-adoption vectors | TermDiscoveryCompleteness, ConfigPushReplyIntegrity | — | Config-push reject flow | +| 8.1 | Recovery raises applied LSN/log length/term | RestartRecoveryGuarantee (existing) | `ha_sync_applied_lsn_from_recovery`, `ha_sync_raft_log_from_recovery` | — | +| 8.2 | Failed recovery step retries, no false-latch | RestartRecoveryGuarantee | phase2 retry helper (`ha.c:415-501`) | — | +| 8.3 | JIT log-length resync beyond boot | RestartRecoveryGuarantee | `ha_apply_term_entry_via_library` resync | — | +| 8.4 | No regression to clean-failover convergence | RestartRecoveryGuarantee | existing tests | — | + +## Components and Interfaces + +| Component | Domain/Layer | Intent | Req Coverage | Key Dependencies (P0/P1) | Contracts | +|---|---|---|---|---|---| +| ConfigPushReplyIntegrity | Controller/Replication | Send an explicit accept/reject reply, carrying term, for every configuration push | 2.2, 2.3, 2.5, 7.4, 7.5 | `ReplConfigPushReply` schema (P0) | Event | +| WalCatchupReplyIntegrity | Controller/Replication | Existing bug-1479 fix; regression-locked, not modified | 2.1, 2.4, 2.5 | `WalAckReply` schema (P0, existing) | Event | +| VoteEndpointFailureRouter | Controller/Election | Route every vote/PreVote endpoint failure, at any timing, to the production tally | 4.1-4.5 | `vote_reply_dispatch` (P0), `pre_vote_reply_dispatch` (P0), `vote_ep_ctx_build_for_test` (P1, test-only) | Service | +| ConformanceRecord | Documentation | Durable action-by-action mapping and dormant-path resolution | 1.1-1.6, 3.3 | `CLAUDE.md`, `ha-term-safety/spec.json` | State | +| ClientLogAppendGuarantee | Controller/Persistence | Existing conformant append-or-explicit-failure behavior; regression-locked | 5.1-5.4 | `persist.c` (existing) | State | +| CommitSourceGuarantee | Controller/Commit | Existing conformant durable-majority-authoritative behavior; regression-locked | 6.1-6.4 | `commit.c` (existing) | State | +| TermDiscoveryCompleteness | Controller/Election | Existing conformant term-adoption vectors (heartbeat, WAL-NACK, vote reply); regression-locked | 7.1-7.3, 7.5 | `raft_on_higher_term_observed` (existing) | Event | +| RestartRecoveryGuarantee | Controller/Recovery | Existing conformant restart/recovery reconcile; regression-locked | 8.1-8.4 | `ha.c` recovery functions (existing) | State | + +Only the two components introducing new code (`ConfigPushReplyIntegrity`, `VoteEndpointFailureRouter`) warrant full detail blocks below; the regression-lock components need no new interface — their existing interfaces are cited in the table above and exercised by the tests in File Structure Plan. + +### Controller / Replication + +#### ConfigPushReplyIntegrity + +| Field | Detail | +|-------|--------| +| Intent | Every configuration-push outcome (accept or reject) produces an explicit `ReplConfigPushReply` carrying the replying member's current term | +| Requirements | 2.2, 2.3, 2.5, 7.4, 7.5 | + +**Responsibilities & Constraints** +- Owns the reply-construction boundary inside `handle_repl_config_push`; does not own configuration activation (`config_activate_committed` remains the sole activation gate, unchanged). +- Must not conflate an activation-deferred outcome (`-EAGAIN`) with a rejection — that path continues to reply `accepted=1`. +- Must include the current term on every reply, success or failure. + +**Dependencies** +- Outbound: `ReplConfigPushReply` schema field (P0) — the additive `term` field this component populates. +- Outbound: `raft_on_higher_term_observed` (P0) — invoked by the primary's inbound-reply handler when this component's reply carries a higher term (existing entry point, no change to it). +- External: none. + +**Contracts**: Event [x] + +##### Event Contract +- Published: `ReplConfigPushReply {accepted: bool, versionTag: uint64, term: uint64}` — one per `ReplConfigPushRequest` received, always sent (never silently dropped). +- Subscribed: none (this component only replies). +- Ordering/delivery: request/reply pair over the existing outbound control channel (`ha-async-io.md` connection ownership); no new ordering guarantee introduced. + +**Implementation Notes** +- Integration: reuses the existing `xce_reply`/`init_reply_by_req` pattern already present in `handle_repl_config_push`'s success path; the four reject branches gain the same call shape. +- Validation: `XCE_TESTING`-only send-hook (mirroring `ha_wal_ack_send_hook`) lets unit tests assert the reply payload without a live endpoint. +- Risks: none material — narrow, single-function change with a directly analogous shipped precedent (bug-1479). + +### Controller / Election + +#### VoteEndpointFailureRouter + +| Field | Detail | +|-------|--------| +| Intent | Every vote/PreVote endpoint failure, regardless of when in the round it occurs, is counted through the same production tally as a delivered denial | +| Requirements | 4.1-4.5 | + +**Responsibilities & Constraints** +- Owns endpoint-failure handling for outgoing vote and PreVote connections (`on_err` callbacks); does not own the tally logic itself (`vote_reply_dispatch`/`pre_vote_reply_dispatch` are consumed, not modified). +- Must preserve the existing `CTRL_PRIMARY` cleanup behavior (standby-endpoint deregistration, quorum-transition logging) identically for both endpoint kinds. +- Must not introduce a new discriminant field on `vote_ep_ctx_t`; the split-handler registration already distinguishes endpoint kind by call site. + +**Dependencies** +- Outbound: `vote_reply_dispatch` (P0) — real-vote tally, already correct for connect/monitor failures. +- Outbound: `pre_vote_reply_dispatch` (P0) — PreVote tally, already correct for connect/monitor failures. +- Outbound: `vote_ep_ctx_build_for_test` (P1, test-only) — reused/extended as the unit-test construction seam. +- Inbound: iomgr `on_err` callback invocation (existing, unchanged trigger). + +**Contracts**: Service [x] + +##### Service Interface +```c +/* vote_ep_err_handler: on_err callback for outgoing real-vote endpoints. + * Election-phase branch now counts a post-connect failure through + * vote_reply_dispatch instead of handle_request_vote_reply. */ +static int vote_ep_err_handler(void *ep_raw); + +/* pre_vote_ep_err_handler: on_err callback for outgoing PreVote endpoints. + * Election-phase branch counts a post-connect failure through + * pre_vote_reply_dispatch. */ +static int pre_vote_ep_err_handler(void *ep_raw); + +/* shared helper: identical CTRL_PRIMARY cleanup extracted from both. */ +static void vote_ep_handle_promoted_disconnect(ha_state_t *ha, endpoint_t *ep, + vote_ep_ctx_t *vctx); +``` +- Preconditions: `ep->data` is a populated `vote_ep_ctx_t` for the endpoint kind the handler is registered against. +- Postconditions: exactly one outcome (denied/counted) reaches the applicable tally function per invocation; `CTRL_PRIMARY`-role invocations perform standby cleanup identically to today. +- Invariants: a candidate's own term is never mistaken for an observed peer term through this path (the synthesized outcome carries the candidate's own term, `granted=0` — unchanged from today's behavior). + +**Implementation Notes** +- Integration: registration sites (`ha.c:688-689`, `827-828`) each point at the correspondingly-named handler; no change to endpoint setup beyond the callback pointer. +- Validation: new unit tests per File Structure Plan, using the reused test-construction helper to simulate a post-connect failure without a live peer. +- Risks: touches live election-path code — mitigated by keeping the extracted `CTRL_PRIMARY` branch byte-for-byte identical and requiring the new tests before this task is considered done (see `research.md` Risks & Mitigations). + +## Data Models + +### Data Contracts & Integration + +**`ReplConfigPushReply` (Cap'n Proto, `src/schema/controller.capnp`)** + +| Field | Ordinal | Type | Change | +|---|---|---|---| +| `accepted` | 0 | Bool | unchanged | +| `versionTag` | 1 | UInt64 | unchanged | +| `term` | 2 | UInt64 | **new, additive** | + +Backward/forward compatibility: Cap'n Proto additive fields are safe under mixed-version rolling upgrade — an old-code standby's reply (no `term` field) decodes as `term=0` on a new-code primary. This is safe by construction: `0` can never present as a term higher than the primary's own current term (terms start at 1 and only increase), so no spurious adoption occurs; the primary simply doesn't get early term-discovery from an old-code peer's config-push replies, which is exactly today's (pre-feature) behavior for that peer. No explicit migration phasing is required beyond the existing rolling-upgrade tolerance the cluster already relies on. + +`WalAckReply` is unchanged (already carries `term`, `lsn`, `success`); listed here only to confirm no modification is needed. + +## Error Handling + +### Error Strategy + +This feature's domain is internal cluster wire-protocol reply integrity, not user-facing request handling — the applicable categories are protocol-rejection, transport-failure, and validation-failure, each with a distinct, already-established response pattern that this feature extends consistently. + +### Error Categories and Responses +- **Validation/protocol rejection** (malformed config-push request, SHA-256 mismatch, `conf_save_config` failure): explicit reject reply (`accepted=0`) carrying term, so the primary can distinguish "actively rejected" from "lost" and react (retry, log, or escalate) — this is the category this feature's fixes target. +- **Transport failure** (connection drop, send failure, RDHUP): counted as a failure outcome through the same production tally/reply path used for a delivered rejection wherever the protocol model requires an outcome (vote/PreVote tally); where no reply is architecturally expected (snapshot chunk transfer, by explicit design — see requirements.md Boundary Context), recovery remains via the next heartbeat cycle, unchanged by this feature. +- **Activation-deferred, not an error** (`config_activate_committed` returning `-EAGAIN`): explicitly not classified as a rejection; the existing loud-fence-and-retry pattern (steering `ha-async-io.md`, "controller never self-terminates") already governs it and is preserved unchanged. + +### Monitoring +No new metrics/logging channels introduced; existing `WARN`/`INFO` logging in `handle_repl_config_push` and `vote_ep_err_handler` is preserved and extended with the same log level conventions already used in each function. + +## Testing Strategy + +- **Unit Tests**: + 1. `handle_repl_config_push` sends `ReplConfigPushReply{accepted=0, term}` for each of the four reject conditions (malformed request, missing bytes/sha256, sha256 mismatch, save failure) — via the new `XCE_TESTING` send-hook. (2.2, 2.3, 2.5) + 2. `handle_repl_config_push` still sends `accepted=1` when `config_activate_committed` returns `-EAGAIN` (activation-deferred is not a rejection). (2.5, 7.5) + 3. `ha_send_wal_ack_reply_ex(success=0)` is actually invoked on a WAL catch-up reject (closing the reply-construction-boundary coverage gap identified during design discovery). (2.1) + 4. `vote_ep_err_handler` routes a synthetic post-connect failure through `vote_reply_dispatch`'s tally, using the reused test-construction helper. (4.2, 4.4) + 5. `pre_vote_ep_err_handler` routes the same failure shape through `pre_vote_reply_dispatch`'s tally. (4.3) + 6. A submitted batch with one failing payload propagates that failure to every payload in the batch. (5.3) + 7. Driving the production heartbeat/replication path end-to-end never increments `ha_send_append_entries_stub_call_count`, while `repl_broadcast`/`ha_stream_wal_to_standby` do fire for the same scenario — the Requirement 3.3 non-regression guard. (3.3) +- **Integration Tests**: + 1. A three-node cluster with one standby configured to reject a pushed configuration (bad hash) observes the primary correctly distinguishing the rejection from a timeout and not treating the push as silently lost. + 2. A three-node election round where one peer's vote endpoint fails after connect (simulated) still reaches a quorum decision without waiting for the full election timeout. + 3. Existing `test_term_safety_adapter.c` advisory-vs-authoritative commit tests re-run unmodified as the Requirement 6 regression lock (no new test needed, confirmed sufficient during design discovery). + 4. Existing `test_persist_recovery.c`/`test_config_repl.c` recovery tests re-run unmodified as the Requirement 8 regression lock. +- **Live/Soak Tests** (per project convention for HA changes, `xce-test-ha` skill): + 1. A rolling chaotic-failover soak where the test driver issues a configuration push whose payload deliberately does not match the sha256 it advertises (no special fault-injection hook needed — this exercises `handle_repl_config_push`'s real SHA-256-mismatch reject branch), confirming the primary observes the explicit reject rather than degrading to the timeout path. + 2. A soak round exercising the post-connect vote/PreVote endpoint failure path end-to-end. **Open question for the tasks phase**: unlike item 1, this needs a way to sever an already-established outbound vote connection before a reply arrives (e.g. a firewall-rule toggle or proxy in the soak harness) — no existing `xce-test-ha` mechanism for this was confirmed during design. If no such mechanism exists cheaply, this item may be deferred; the unit tests (Requirement 4.2/4.3, via `vote_ep_ctx_build_for_test`) already give direct, deterministic coverage of the fix itself. + +## Supporting References +- `research.md` — full gap analysis (asset map, options, effort/risk), design-phase discovery log, and the two recorded design decisions (dormant sender resolution, vote-handler split) with full rationale. +- `src/controller/CLAUDE.md` — "TLA+ Action-to-Code Mapping" and "Protocol Verification Checklist," extended by this feature as the durable conformance record (Requirement 1). diff --git a/.kiro/specs/raft-adapter-conformance/requirements.md b/.kiro/specs/raft-adapter-conformance/requirements.md new file mode 100644 index 0000000..531f0eb --- /dev/null +++ b/.kiro/specs/raft-adapter-conformance/requirements.md @@ -0,0 +1,120 @@ +# Requirements Document + +## Introduction + +This feature performs a systematic, action-by-action conformance audit of the XCE controller's Raft replication **adapter** — the wire-level send/receive/reply code in `src/controller/ha.c`, `repl.c`, and `config_repl.c` — against the actions of the canonical Raft protocol model (`raft/raft.tla`: `AppendEntries` request/response, `RequestVote`/`PreVote` request/response, `ClientRequest`/log append, `AdvanceCommitIndex`, term/`UpdateTerm` handling, and restart/recovery reconcile). It is distinct from and complements `raft-sim-conformance`, whose boundary is the in-process, in-memory library harness (`src/lib/raft/raft_sim.c`) validating the library's own protocol semantics; this feature validates that the controller adapter faithfully carries the library's decisions onto the wire without silently dropping a response, retry, or backoff step the protocol model assumes always happens. + +**Motivating finding.** A fresh live-soak re-verification of bug-1479's fix surfaced that the controller's only `WalAckReply` constructor hardcoded success, so no production code path ever sent a failing reply — a standby's WAL catch-up rejection was silently dropped rather than reaching the primary as a NACK, reproducing bug-1479's permanent-quorum-loss symptom by a different mechanism than the original defect. That gap, plus a second, independently-discovered adapter gap it exposed (a standby's catch-up streaming range was capped at the leader's committed point rather than its real log tail, creating a self-referential deadlock), are already fixed and live-verified as of this spec's seeding (see bug-1479 in `.wolf/buglog.json` and `config-upgrade-snapshot` task 8.6). This feature's job is the broader pass that finding was a symptom of: walk every Raft protocol action against the adapter code that is supposed to realize it, and treat each specific type of gap consistently rather than fixing instances one at a time as they surface via live incidents. + +**Audit results seeded into this requirements pass.** A fresh action-by-action pass performed for this spec, cross-referenced against prior `raft-log-replication`/`raft-commit-safety`/`ha-term-safety`/`raft-sim-conformance` validation notes, confirmed: +- Two areas already conformant and worth protecting with regression coverage: `ClientRequest`/log append integrity, and the durable-majority-authoritative / advisory-raft-index split for `AdvanceCommitIndex`. +- Two live, unfixed gaps of the same class as the motivating finding: a standby's configuration-push rejection (malformed message, missing fields, checksum mismatch, or save failure) never sends an explicit reject reply, so the primary cannot distinguish an actively-rejected push from a lost packet; and a vote/PreVote endpoint failure arriving after connect (not at connect time) is counted through a legacy path instead of the production vote-tally path, reopening — for that one failure window — the same silent-drop defect class bug-1423 already fixed for connect-time failures. +- One architecture question requiring a design decision rather than a behavioral fix: a fully protocol-conformant, per-peer index-driven `AppendEntries` sender exists in the codebase but has zero production callers; the mechanism actually driving replication in production today is a different, coarser substitute (broadcast-plus-catch-up-marking) that converges correctly post-fix but is not the mechanism the design documentation and the protocol model depict. + +Per this feature's scope decision, the confirmed live gaps found during this pass are fixed within this feature rather than deferred to separate specs, following the same precedent as the motivating finding. + +## Boundary Context + +- **In scope**: + - A documented, action-by-action mapping between each `raft.tla` protocol action and the controller adapter code path(s) that realize it, with an explicit conformance verdict per action and citations precise enough to be independently re-verified. + - Reconciling documentation-vs-code drift the audit finds at this boundary (a design document describing a code path that is not the one actually exercised in production) by recording which path is live and which is dormant or superseded. + - Fixing every live gap the audit confirms, where the adapter fails to produce a response, retry, or backoff step that the protocol model or an already-shipped sibling fix assumes exists — including the configuration-push rejection reply and the post-connect vote/PreVote failure routing named above, and any other such gap the systematic pass confirms. + - Regression coverage that locks in both the gaps already fixed before this spec (WAL catch-up rejection replies, catch-up streaming ceiling, vote/PreVote connect-time failure routing, restart/recovery log resync) and the gaps this spec fixes, so a future change cannot silently reopen either. + - A single, unambiguous decision (recorded as a requirement) about which `AppendEntries` send/retry/backoff mechanism is production-authoritative — the existing per-peer index-driven sender, or the broadcast-plus-catch-up substitute — so the codebase does not carry two divergent implementations of the same guarantee. +- **Out of scope**: + - Any change to the Raft protocol logic itself (election, `logOk` freshness, `(term,index)` truncation, current-term commit, `UpdateTerm`) inside `src/lib/raft/raft.c` — that logic is validated by `raft-log-replication`, `raft-commit-safety`, and `raft-sim-conformance`; this feature validates only that the controller adapter carries the library's decisions onto the wire. + - Configuration-*upgrade* materialized-state consistency (full entity-bearing state snapshot at a configuration change boundary) — remains the independent `config-upgrade-snapshot` spec's scope. + - Changes to the controller voting set (adding/removing a controller peer) — remains `ha-config-bootstrap`'s scope; this feature does not introduce quorum/membership transitions. + - Client-side primary-discovery behavior (bug-854) and catch-up payload handling across multiple WAL segments (bug-847) — tracked separately, not part of the adapter's reply-integrity contract this feature audits. + - Any change to when or how the primary decides to advance `committed_lsn` beyond preserving the existing durable-majority-authoritative behavior — that decision boundary belongs to `ha-commit-engine`/`ha-term-safety`. +- **Adjacent expectations**: + - Relies on the raft library's callback contract (`on_persist_entry`, `on_get_entry_term`, `on_send_append_entries`, `on_truncate_from`, `on_commit_advanced`) and entry points (`raft_log_append`, `raft_on_append_entries_request`/`reply`, `raft_advance_commit`, vote/pre-vote handling) exactly as delivered by the Raft TLA+ Conformance series; this feature does not change that contract, only how faithfully the adapter drives it. + - Relies on the out-of-band configuration-push transport (`ha-term-safety`) continuing to carry configuration bytes hash-verified against the committed `(term, lsn)` marker; this feature adds reply integrity to that transport's rejection path without changing what it carries. + - Any gap this feature's audit finds that is genuinely new protocol-model territory (not covered by an existing sibling spec's boundary) is fixed here; any gap that falls within an existing sibling spec's stated scope is cross-referenced to that spec rather than duplicated. + +## Requirements + +### Requirement 1: Systematic Raft adapter conformance audit + +**Objective:** As a maintainer, I want a documented, action-by-action mapping between the Raft protocol model's actions and the controller's adapter code, so that gaps between the model's assumptions and production behavior are found deliberately and once, instead of being rediscovered independently through separate live incidents. + +#### Acceptance Criteria +1. The conformance audit shall produce a written mapping that lists, for each of `AppendEntries` request, `AppendEntries` response, `RequestVote`/`PreVote` request, `RequestVote`/`PreVote` response, `ClientRequest`/log append, `AdvanceCommitIndex`, term/`UpdateTerm` handling, and restart/recovery reconcile, the controller adapter code path(s) that realize it and a conformance verdict. +2. When the audit finds that a sibling spec's design documentation describes an adapter code path that differs from the code path actually exercised in production, the audit shall record which path is live and which is dormant or superseded, rather than leaving the discrepancy implicit. +3. When the audit finds a gap where the protocol model assumes a response, retry, or backoff step that the adapter does not perform, the audit shall record the affected code path, the triggering condition, and the observed effect in enough detail to be independently re-verified without re-deriving the finding from scratch. +4. The audit shall classify each finding as either requiring a code fix (a live path that violates the model's guarantee) or documentation-only drift (the guarantee holds in production, but design documentation describes a different mechanism than what runs). +5. Where a finding is classified as requiring a code fix, the fix shall be delivered under this feature's Requirements 2 through 8, not deferred to a separate spec. +6. Where a finding is classified as documentation-only drift, the audit shall record the correction needed so the affected design documentation can be reconciled without re-investigating the code. + +### Requirement 2: AppendEntries-equivalent rejection reply integrity + +**Objective:** As an operator of an HA controller cluster, I want every replication message a standby rejects to produce an explicit reply back to the primary, so that the primary always learns of a rejection and can retry or re-route rather than the cluster stalling on a silently dropped reject. + +#### Acceptance Criteria +1. When a standby rejects a WAL catch-up entry for any reason (log mismatch, forward gap, or apply failure), the Controller shall send an explicit reply indicating rejection back to the primary. +2. When a standby rejects a configuration push for any reason (malformed message, missing required fields, checksum mismatch, or a local save failure), the Controller shall send an explicit reply indicating rejection back to the primary, mirroring the acceptance reply already sent on a successful push. +3. The rejection reply for a configuration push shall be distinguishable by the primary from a lost or undelivered push, so that the primary's push-and-wait logic never treats an active rejection and a transport loss as the same outcome. +4. While no explicit rejection or acceptance reply has arrived within the applicable transport wait bound, the Controller shall continue to treat the outcome as unknown rather than inferring success. +5. The Controller shall not regress the acceptance-reply behavior for a successful WAL catch-up entry or a successful configuration push. + +### Requirement 3: AppendEntries send retry and backoff guarantee + +**Objective:** As an operator, I want exactly one production-authoritative mechanism driving `AppendEntries`-equivalent replication retries and per-peer backoff, so that a rejected or lost replication attempt is corrected without relying on two divergent, only-one-of-which-is-live implementations of the same guarantee. + +#### Acceptance Criteria +1. When the primary receives an explicit rejection reply for a replicated entry, the Controller shall retry replication to that standby from an earlier point rather than repeating the same rejected attempt. +2. While a standby remains behind after a rejection, the Controller shall continue advancing that standby's catch-up point across successive rounds until it converges, rather than requiring convergence in a single round. +3. The Controller shall have exactly one send/retry/backoff mechanism that is authoritative in production for `AppendEntries`-equivalent replication; where more than one fully-implemented mechanism exists in the codebase, the non-authoritative one shall be resolved by one of: retiring it, making it the production path, or formally documenting it as an intentionally-dormant reference path guarded against silent regression (e.g. an explicit non-production marker plus a test asserting it stays uncalled in production) — so the codebase never carries two divergent, unreconciled implementations of the same guarantee. +4. If a replication send fails at the transport level (not a rejection), the Controller shall not treat the standby as caught up, and shall re-attempt replication to it within a bounded number of subsequent replication cycles. + +### Requirement 4: RequestVote/PreVote reply integrity across all failure modes + +**Objective:** As an operator, I want every vote or pre-vote request outcome — granted, denied, or a failure that prevents a reply — to be counted through the same production tally, regardless of when in the round the failure occurs, so that an election or pre-vote round can reach its fast "all replied" decision instead of always falling back to the full round timeout. + +#### Acceptance Criteria +1. When a vote request cannot be delivered because the connection could not be established, the Controller shall count that outcome through the same production vote-tally path used for a delivered denial. +2. When a vote request connection is established but then fails before a reply arrives (a post-connect failure), the Controller shall count that outcome through the same production vote-tally path used for a connect-time failure and for a delivered denial, rather than through a separate legacy path that does not update the tally. +3. The Controller shall apply the same failure-counting behavior to a pre-vote request as to a real vote request. +4. The Controller shall not regress the existing connect-time and monitor-time failure routing already verified for vote and pre-vote requests. +5. When every peer in an election or pre-vote round has replied or had its outcome counted, the Controller shall be able to reach a quorum decision without waiting for the round's full timeout. + +### Requirement 5: ClientRequest / log append integrity + +**Objective:** As a maintainer, I want a client write to always resolve to either an acknowledged append or an explicit, propagated failure, so that a write is never silently lost between submission and its outcome. + +#### Acceptance Criteria +1. When the primary appends a client-submitted entry, the Controller shall either persist the entry and make it eligible for replication, or return an explicit failure to the submitter. +2. The Controller shall not advance the log length for an entry whose persistence failed. +3. When a batch of submitted entries includes one that fails to persist, the Controller shall propagate that failure to every entry in the same batch rather than silently completing a subset. +4. The Controller shall not regress the existing behavior where a persistence failure is returned to the caller rather than swallowed. + +### Requirement 6: Commit advancement source-of-truth preserved + +**Objective:** As an operator, I want the durable-majority barrier to remain the sole authority for advancing the committed point, so that the advisory Raft commit index can never gate, delay, or override a safe commit advance. + +#### Acceptance Criteria +1. The Controller shall advance the committed point using the durable-majority barrier as the sole authoritative source. +2. The Controller shall treat the Raft library's advisory commit index as informational only; it shall neither block nor be required for the durable-majority barrier to advance the committed point. +3. The Controller shall not reintroduce a hard ceiling that requires both the durable-majority barrier and the advisory Raft commit index to agree before advancing the committed point. +4. When the advisory Raft commit index lags the durable-majority watermark, the Controller shall still advance the committed point according to the durable-majority barrier. + +### Requirement 7: Term discovery completeness + +**Objective:** As an operator, I want every reply channel capable of carrying a peer's observed election term to trigger term adoption when that peer's term is higher, so that a stale-term node cannot remain stuck retrying against a peer that has already moved to a higher term. + +#### Acceptance Criteria +1. When a heartbeat reply carries a term higher than the primary's current term, the Controller shall adopt the higher term and step down from any leadership held at the lower term. +2. When a WAL rejection reply carries a term higher than the sender's current term, the Controller shall adopt the higher term. +3. When a vote or pre-vote reply carries a term higher than the candidate's current term, the Controller shall adopt the higher term. +4. When a configuration-push reply is sent, the Controller shall include the replying member's current term, so a higher term can be discovered through that reply channel as it already is through heartbeat and WAL-rejection replies. +5. The Controller shall not regress the existing heartbeat-reply and WAL-rejection term-adoption behavior already verified for this cluster. + +### Requirement 8: Restart / recovery reconciliation conformance + +**Objective:** As an operator, I want a restarted or rejoining controller to reconcile its applied state, log length, and term from its durable floor every time recovery runs, so that a boot-ordering or partial-failure hazard cannot leave a node permanently out of sync with what it has actually persisted. + +#### Acceptance Criteria +1. When a controller completes startup recovery, the Controller shall raise its applied LSN, log length, and term from the recovered durable floor, never leaving them below what recovery found. +2. If a recovery step fails partway through cluster initialization, the Controller shall retry that step rather than permanently latching a completed state without having finished it. +3. While a term-safe append-entries receive occurs after startup, the Controller shall re-check and, if needed, re-raise its log length from the durable floor, not only at boot time. +4. The Controller shall not regress the existing byte-identical convergence behavior for a single clean failover and restart. diff --git a/.kiro/specs/raft-adapter-conformance/research.md b/.kiro/specs/raft-adapter-conformance/research.md new file mode 100644 index 0000000..063a461 --- /dev/null +++ b/.kiro/specs/raft-adapter-conformance/research.md @@ -0,0 +1,231 @@ +# Gap Analysis: raft-adapter-conformance + +Analysis date: 2026-07-29. Requirements phase: generated (not yet approved). Per skill fallback rule, proceeding — gap analysis findings can also inform requirement refinement before approval. + +## Method + +Codebase investigation used direct `Read`/`grep` against `src/controller/ha.c`, `repl.c`, `config_repl.c`, `cluster.c`, `src/lib/raft/raft.c`/`raft.h`, `src/schema/controller.capnp`, and `src/controller/testsuite/`, plus the two Explore-agent passes already run during requirements generation (their findings are the primary input to Requirement-to-Asset mapping below; this pass adds the concrete integration-point evidence — schema fields, dispatcher code, struct layouts — needed to select an implementation approach). No external dependency research was needed; this is entirely an internal-codebase conformance question. + +## Requirement-to-Asset Map + +### Requirement 1 — Systematic conformance audit deliverable + +| Asset | Status | +|---|---| +| `raft/raft.tla` (canonical action list: `Restart`, `Timeout`, `RequestVote`, `BecomeLeader`, `ClientRequest`, `AdvanceCommitIndex`, `AppendEntries`, `Receive`→`UpdateTerm`/`HandleRequestVoteRequest`/`HandleRequestVoteResponse`/`HandleAppendEntriesRequest`/`HandleAppendEntriesResponse`) | Present, unmodified upstream copy | +| `src/controller/CLAUDE.md` → "TLA+ Action-to-Code Mapping" + "Protocol Verification Checklist" tables | **Present and already the natural home for this deliverable** — but incomplete/partially stale (its own checklist entry admits a 2026-07-18 citation correction; it does not yet list the two already-fixed reply-integrity gaps or the two newly-found ones) | +| `ha-term-safety/spec.json` `known_limitations` (3 entries) + `tasks.md:195` | Present — already contain two of the three documentation-drift notes this audit would otherwise re-derive (dormant `on_send_append_entries`/`raft_send_append_entries` send path; advisory-vs-authoritative commit index) | +| `raft-sim-conformance/spec.json` `known_limitations` (3 entries) | Present — contains the follower-commit-index documentation-drift note | +| A standalone, dedicated conformance-map document | **Missing** (no such file exists yet under `.kiro/specs/raft-adapter-conformance/` or `docs/`) | + +**Gap tag**: Constraint — CLAUDE.md's table is intentionally terse (a living quick-reference, not an evidentiary audit trail); the systematic pass's detailed findings (file:line citations, live-vs-dormant verdicts, reasoning) don't fit there without bloating it. + +### Requirement 2 — AppendEntries-equivalent rejection reply integrity + +| Sub-area | Asset | Status | +|---|---|---| +| WAL catch-up reject reply | `ha_send_wal_ack_reply_ex` (bug-1479, `ha.c` ~6680+), `WalAckReply` schema (`controller.capnp:876-880`, already has `term`, `lsn`, `success`) | **Fixed and live.** Gap tag: Unknown — need to confirm a regression test explicitly asserts a reject reply is sent (not just that the NACK routes once received); `test_ha_core_safety.c` has adjacent pin tests (`test_2_3_termblind_route_payload_guarded`, `test_2_3_unrepairable_catchup_raises_nonpromotable_fence`) but their scope wasn't fully re-verified this pass. | +| Config-push reject reply | `handle_repl_config_push` (`config_repl.c:1261-1337`); dispatch site `cluster.c:652-655` (`rc = handle_repl_config_push(...)`, no reply built on any `rc`); contrast `cluster.c:767-772` `default:` case, which *does* send a generic error reply on unknown opcode | **Missing — confirmed live gap.** Read in full this pass: 4 early returns (`-EINVAL` malformed body ~1266, `-EINVAL` missing bytes/sha256 ~1286, `-EBADMSG` sha mismatch ~1294, `rc` from `conf_save_config` failure ~1309) all `return` before constructing any `repl_config_push_reply_t`. Only the success tail (~1326-1335) builds and sends `{accepted=1, version_tag}`. The outer dispatcher never synthesizes a reply from a nonzero `rc` for this opcode — logged bug-1480. | +| `ReplConfigPushReply` schema | `controller.capnp:805-808`: `struct ReplConfigPushReply { accepted @0: Bool; versionTag @1: UInt64; }` | **Constraint, not itself missing for the reject-reply fix** — adding `accepted=0` needs no schema change (the field already exists); only Requirement 7's term field is a schema addition (see below). | +| Distinguishing reject from activation-deferred | `config_activate_committed` returning `-EAGAIN` (activation gated on committed marker, by design) does **not** early-return in `handle_repl_config_push` — the function still falls through to send `accepted=1` in that case | **Important design nuance for the fix**: `accepted` currently means "bytes saved out-of-band," not "activated." The reject-reply fix must not conflate the two — an `-EAGAIN` activation defer is expected/retriable and must keep sending `accepted=1`; only the four genuine save/validation failures above should send `accepted=0`. | + +### Requirement 3 — AppendEntries send retry/backoff, single authoritative mechanism + +| Asset | Status | +|---|---| +| `raft_send_append_entries` (`raft.c:595`) — protocol-conformant, nextIndex-driven | **Confirmed zero production callers** (only `raft_sim.c` and an `XCE_TESTING` helper `ha_cb_send_append_entries_for_test`) — re-verified this pass via full-repo grep. | +| `ha_cb_send_append_entries_stub` (`ha.c:2533-2574`) — the registered `on_send_append_entries` callback, delegates to `repl_send_append_entries` | Registered (`s_real_cbs`) but **only reachable via `raft_send_append_entries`**, which nothing in the live controller calls — so this callback is wired but dormant, confirmed by its own call graph, not just the sibling-spec note. | +| `repl_broadcast` (`repl.c:295-380`) + `ha_stream_wal_to_standby` (`config_repl.c`, catch-up streamer) | **This is the actual production send/retry mechanism** — unconditional newest-entry broadcast plus heartbeat-driven catch-up range streaming, not nextIndex-indexed. | +| **A prior, already-recorded design decision** — `test_ha_core_safety.c:2474`: *"DECISION: DOCUMENT SAFE-BY-GUARD, do not structurally retire."* Reasoning given: the term-blind branches this dead path would exercise are (a) unreachable with real data today, and (b) even if reached, already guarded elsewhere (`persist_wal_write_replicated`'s (term,lsn,payload-crc) guard + sticky non-promotable fence). | **This materially changes the decision space** for Requirement 3 AC3. A prior investigation already considered and rejected structural retirement, for reasons that still hold. This is not new information the design phase needs to re-derive — it's an existing, reasoned precedent. | + +**Gap tag**: Constraint (design precedent already exists and argues against literal retirement) — see Options below. + +### Requirement 4 — RequestVote/PreVote reply integrity, all failure modes + +| Asset | Status | +|---|---| +| `vote_ep_err_handler` (`ha.c:7564-7608`, read in full this pass) | Confirmed: election-phase branch calls `handle_request_vote_reply(ha, vctx->ctx, vctx->peer_idx, vctx->my_term, 0, 0, 0)` directly — the legacy path, bypassing `vote_reply_dispatch`/`pre_vote_reply_dispatch`. | +| `vote_ep_ctx_t` (`ha.c:46-61`, full struct read this pass) | **Missing a discriminant.** The struct has no field distinguishing a real-vote endpoint from a PreVote endpoint — `peer_idx`, `my_term`, `my_tag`, `my_lsn`, `my_last_log_term/index`, `my_name`, but nothing like `is_prevote`. `vote_ep_err_handler` is registered identically at both call sites (`ha.c:688-689` real-vote, `ha.c:827-828` PreVote) and currently has no way to route correctly even if it tried. | +| `vote_reply_dispatch` (~`ha.c:6333-6394`), `pre_vote_reply_dispatch` (~`ha.c:7982-8000`) | Both exist and are already the correct production tally paths for the connect-time/monitor-time failures bug-1423/1424 fixed. | + +**Gap tag**: Missing (discriminant field + routing branch) — concrete, bounded fix; not an unknown. + +### Requirement 5 — ClientRequest / log append integrity + +| Asset | Status | +|---|---| +| `raft_log_append` (`raft.c:562-593`), `ha_primary_log_append` (`ha.c:4777-4823`), `append_job_wal_entry_local`/`persist_submit_job_payloads_async` (`persist.c:6081-6199`) | Traced and confirmed conformant this pass (persist-before-act, no phantom log-length advance, failures propagated per-payload, first-failure rc propagated across a batch). | + +**Gap tag**: Unknown (test-coverage only) — no code gap found; need to confirm which existing test IDs already assert "failed persist ⇒ no log-length advance ⇒ caller sees the failure" as a locked invariant, or whether this needs a new regression test. Not investigated further this pass (out of gap-analysis scope per the framework's "defer deep research to design phase"). + +### Requirement 6 — AdvanceCommitIndex / commit-source-ownership + +| Asset | Status | +|---|---| +| `raft_advance_commit` (`raft.c:769-821`), `ha_cb_commit_advanced_stub` (`ha.c:2616-2667`) → `commit_set_raft_commit_index` (`commit.c:1082-1095`, advisory-only, monotonic) | Confirmed conformant. | +| `majority_candidate_locked` (`commit.c:121-198`) — the actual authoritative ceiling, capped at `persist_durable_lsn` | Confirmed authoritative; `commit.c:139-155` comment documents *why* a prior `min(durable-majority, raft_commit_index)` coupling was tried and removed (starvation). | +| `XCE_TESTING` assert at `commit.c:222` (`committed_lsn` never exceeds `persist_durable_lsn`) | **Existing regression guard already present** — a strong asset; likely already catches any future accidental re-coupling. | + +**Gap tag**: Low — mostly already regression-guarded by the existing `XCE_TESTING` assert; confirm during design whether an additional explicit test naming `raft_commit_index` as advisory-only is warranted, or whether the existing assert suffices. + +### Requirement 7 — Term discovery completeness + +| Asset | Status | +|---|---| +| Heartbeat-reply (`ha.c:6636-6651`) and WAL-NACK (`ha.c:6746-6784`) term-adoption vectors, both feeding `raft_on_higher_term_observed` (`raft.c:855-874`) | Confirmed fixed and live (bug-1421). | +| `WalAckReply` schema already carries `term @0` | Present — no schema work needed for the WAL-NACK vector. | +| `ReplConfigPushReply` schema (`controller.capnp:805-808`) | **Missing a `term` field** — confirmed by direct read this pass: only `accepted`/`versionTag`. Adding a reply-carried term here is an additive `.capnp` schema change (new field number, e.g. `term @2: UInt64`), not a breaking one. | +| Cap'n Proto codegen build step | **Unknown this pass** — need to confirm which Meson target regenerates the `.capnp.c`/`.capnp.h` from `controller.capnp` (likely `capnpc` invoked from the top-level `meson.build`), and whether the historical `nixSupport/xce.nix` capnpc-pin issue (bug-918, already fixed) has any bearing on a schema *field addition* (as opposed to a `c-capnproto` version bump) — almost certainly not, but worth a one-line confirmation in design rather than assuming. | + +**Gap tag**: Missing (schema field) + Unknown (codegen build-step confirmation, low-risk). + +### Requirement 8 — Restart/recovery reconciliation + +| Asset | Status | +|---|---| +| `ha_sync_applied_lsn_from_recovery`/`ha_sync_raft_log_from_recovery` (`ha.c:5296-5351`), phase2 retry helper (`ha.c:415-501`), promotion call sites (`ha.c:1867-1897`, `2112-2131`), JIT log_len resync (`ha.c:3200-3204`) | Confirmed conformant and already fixed (bug-1042, bug-1477, bug-1475). | + +**Gap tag**: Unknown (test-coverage only, same caveat as Requirement 5/6) — no code gap found. + +## Implementation Approach Options + +### Requirement 1 (audit deliverable) + +- **Option A — Extend `CLAUDE.md`'s existing tables.** Update the "TLA+ Action-to-Code Mapping" and "Protocol Verification Checklist" in place; add rows/checklist items for the reply-integrity guarantees this feature establishes. ✅ single source of truth, no new doc to keep in sync. ❌ CLAUDE.md is meant to stay terse — doesn't have room for full per-finding evidence (file:line trails, live-vs-dormant reasoning) without bloating a document every session reads. +- **Option B — New standalone conformance-map document** (e.g. `.kiro/specs/raft-adapter-conformance/design.md`'s own dedicated section, or a `docs/raft-adapter-conformance.md`). ✅ room for full evidentiary detail. ❌ a second place that can drift from CLAUDE.md's summary table, recreating exactly the "documentation drift" class of problem this feature exists to fix. +- **Option C — Hybrid (recommended direction for design phase).** CLAUDE.md's table stays the terse, always-current pointer (updated as part of this feature's fixes); the full audit trail with citations and verdicts lives in this spec's own `design.md`, referenced *from* CLAUDE.md by name so there is one canonical detailed source and one canonical terse pointer, not two competing summaries. + +### Requirement 2 (rejection reply integrity) + +- **Option A — Extend `handle_repl_config_push` in place**, mirroring the `ha_send_wal_ack_reply_ex` pattern already established for the WAL catch-up fix: build and send a `ReplConfigPushReply{accepted=0}` at each of the four reject early-returns, taking care not to touch the `-EAGAIN` activation-defer path (which correctly stays `accepted=1`). ✅ minimal, uses an established in-codebase pattern, touches one function. ❌ none significant — this is a narrow, well-bounded fix. +- No Option B/C considered necessary — the fix is a direct, small extension of an existing function using a precedent already proven in production (bug-1479). Effort/risk assessment below reflects this. + +### Requirement 3 (single authoritative send/retry mechanism) + +- **Option A — Document as intentionally dormant (recommended, matches existing precedent).** Formalize the `test_ha_core_safety.c:2474` decision into the design doc and CLAUDE.md: `raft_send_append_entries`/`ha_cb_send_append_entries_stub` remain in the codebase as a library-conformant reference implementation exercised only by `raft_sim`/tests, explicitly marked as such; `repl_broadcast` + catch-up streaming remains the sole production mechanism. No behavior change. ✅ lowest risk, respects a reasoned prior decision, zero regression surface. ❌ leaves two implementations in the codebase long-term (a documentation cost, not a correctness one). +- **Option B — Structurally retire the dead path** (delete `raft_send_append_entries`'s production wiring, keep it library-internal/test-only via `#ifdef XCE_TESTING` or move it fully into `raft_sim.c`). ✅ removes the "two implementations" documentation burden entirely. ❌ contradicts the specific reasoning already recorded against this (loses a working, protocol-exact reference implementation `raft_sim` and future specs may want); touches library-public API (`raft.h:378`) that other tests reference directly. +- **Option C — Wire in as the real production path**, replacing `repl_broadcast`/catch-up-streaming with nextIndex-driven sends. ✅ closest to `raft.tla` literally. ❌ highest risk by far — replaces a converging, live-verified (post bug-1479) core replication mechanism with an unexercised-in-production one; would need its own multi-round chaotic-soak verification before trust; effort XL, not justified by any live defect (the current substitute already converges correctly). + +### Requirement 4 (vote/PreVote failure routing) + +- **Option A — Add a discriminant field to `vote_ep_ctx_t`** (e.g. `bool is_prevote`), set at allocation (`ha.c:629` real-vote alloc → `false`, `ha.c:784` PreVote alloc → `true`), then branch inside `vote_ep_err_handler`'s election-phase case to call `vote_reply_dispatch` or `pre_vote_reply_dispatch` accordingly. ✅ single handler retained, minimal struct change, mirrors how `my_term`/`peer_idx` are already threaded per-context. ❌ handler gains a branch, slightly more complex than today. +- **Option B — Split into two handlers** (`vote_ep_err_handler` / `pre_vote_ep_err_handler`), registered at their respective existing call sites (`ha.c:688-689` vs `827-828`, which are already separate registration points today). ✅ no runtime branch, each handler stays single-purpose, matches the existing pattern where connect/monitor failures are *already* handled at separate call sites for the two endpoint kinds. ❌ near-duplicate logic in two functions (the `CTRL_PRIMARY` branch — standby-endpoint cleanup — is identical in both; would need a shared helper to avoid copy-paste). +- Recommendation for design phase: Option B composed with a small shared helper for the `CTRL_PRIMARY` cleanup branch is likely cleanest, but this is a genuine, low-stakes design choice — either is a bounded, low-risk change. + +### Requirements 5, 6, 8 (already-conformant areas) + +- **Option A only, no alternatives needed** — these are regression-lock requirements. The task is to confirm or add test coverage that pins the already-correct behavior (existing `XCE_TESTING` assert at `commit.c:222` for Requirement 6 is a strong existing asset; Requirements 5 and 8 need a design-phase check of which existing test IDs already exercise the traced code paths before deciding whether any new test is needed at all). + +### Requirement 7 (term discovery / config-push term field) + +- **Option A — Add `term @2: UInt64` to `ReplConfigPushReply`, populate it in `handle_repl_config_push`'s reply construction** (both the existing success path and the new Requirement 2 reject paths), and route it through the same `raft_on_higher_term_observed` adoption call already used for the heartbeat and WAL-NACK vectors. ✅ additive schema change (safe, no wire-format break), reuses the established adoption entry point, and — since Requirement 2 already touches every reply-construction site in this function for the reject-reply fix — can be implemented in the same edit pass with no extra integration surface. This pairing should be called out explicitly in the design/tasks phase so it isn't accidentally split into two separate change sets touching the same lines twice. + +## Effort & Risk + +| Requirement | Effort | Risk | Justification | +|---|---|---|---| +| 1 — Audit deliverable | S (1-3 days) | Low | Documentation + citation verification; no code risk. | +| 2 — Rejection reply integrity | S (extends one existing function with a proven pattern) | Low | Bounded to `handle_repl_config_push`; must respect the `-EAGAIN` activation-defer nuance found this pass, otherwise trivial. | +| 3 — Single authoritative send mechanism | S if Option A (document only) / XL if Option C (wire in) | Low (Option A) to High (Option C) | A prior in-codebase decision already argues for Option A; Option C would require full chaotic-soak reverification of a currently-working guarantee for no confirmed live defect. | +| 4 — Vote/PreVote failure routing | S-M | Low-Medium | Small struct/handler change, but touches election-path code; needs a live/soak test that can actually inject a post-connect (not connect-time) endpoint failure — that injection capability's current existence is unconfirmed (see Research Needed). | +| 5 — ClientRequest integrity | S (test-only, likely) | Low | No code gap found; effort is test-coverage confirmation. | +| 6 — Commit source-of-truth | S (test-only, likely) | Low | Existing `XCE_TESTING` assert already guards this. | +| 7 — Term discovery completeness | S-M (schema change + wiring, shares an edit pass with Requirement 2) | Low-Medium | Additive schema field is low-risk; the only real unknown is confirming the capnp codegen build step, not the change itself. | +| 8 — Restart/recovery reconciliation | S (test-only, likely) | Low | No code gap found; already-fixed by bug-1042/1477/1475. | + +## Research Needed (carried forward to design phase) + +1. **Test-coverage confirmation for Requirements 5, 6, 8** — identify the specific existing test IDs (in `test_ha_core_safety.c`, `test_apply_pump.c`, `test_commit_durability.c`, or elsewhere) that already lock each already-conformant guarantee, versus needing a net-new regression test. Not investigated deeply this pass per the gap-analysis framework's "defer deep research to design." +2. **Post-connect endpoint failure injection** — confirm whether the existing test harness (`test_ha_vote_send.c` or similar) can already simulate a failure arriving *after* a successful connect+monitor (as opposed to a connect-time failure, which is already tested per bug-1423/1424's regression coverage) — needed to properly test the Requirement 4 fix. +3. **Cap'n Proto codegen build step** — confirm the exact Meson target/invocation that regenerates `controller.capnp.c/.h` from the schema, for the Requirement 7 field addition. Low risk expected (additive field, not a `c-capnproto` version change like bug-918), but unconfirmed this pass. +4. **`handle_repl_config_push`'s WAL catch-up sibling regression test scope** — re-confirm (rather than assume from prior-session notes) exactly which `test_ha_core_safety.c` test IDs assert the bug-1479 WAL-ACK reject-reply fix, so the new config-push reject-reply test can be modeled on the same pattern. +5. **Requirement 3 wording tension** — Requirement 3 AC3 currently reads "...shall be either retired or made the production path." The asset found this pass (`test_ha_core_safety.c:2474`'s prior "document, do not structurally retire" decision) suggests a third real option — formally document as intentionally dormant — that isn't literally "retired." Flag for the design phase to either treat "retired" broadly enough to cover a documented-dormant-with-guard outcome, or revisit the requirement's wording before design finalizes. + +## Recommendations Summary + +- Requirements 2 and 7 should be planned as a single combined change (same function, same schema, same edit pass) rather than sequenced separately. +- Requirement 3's design decision should start from the existing `test_ha_core_safety.c:2474` precedent (Option A, document-only) rather than re-litigating retire-vs-wire-in from scratch; only revisit if the design phase surfaces a concrete reason the prior reasoning no longer holds. +- Requirements 5, 6, and 8 are low-effort, test-coverage-confirmation items — worth batching into one design-phase task rather than three separate ones. +- Requirement 4's Option A vs B (discriminant field vs split handler) is a genuine, low-stakes design choice; either is acceptable, defer to design phase author preference. + +--- + +# Design-Phase Discovery & Decisions + +This section extends the gap analysis above with the design-phase discovery pass and the decisions it resolved. Discovery type: **Extension** (existing controller subsystem, no new external dependency) — light discovery process applied. + +## Summary +- **Feature**: `raft-adapter-conformance` +- **Discovery Scope**: Extension +- **Key Findings**: + - The Cap'n Proto codegen path for the schema change (Req 2/7) is a pre-existing, unconditional Meson `custom_target` (`src/lib/meson.build:1-10`, `capnp compile -o c:lib`) — an additive field needs no build-system change, closing Research Needed item 3 from the gap analysis with high confidence. + - `ha_send_wal_ack_reply_ex` (`ha.c:3095-3116`) already establishes the exact pattern to mirror for the config-push reject-reply fix: an `XCE_TESTING`-only send-hook (`ha_wal_ack_send_hook`) that lets a unit test observe the reply payload without a live endpoint. This resolves the "how do we test this" question for Req 2 by precedent rather than invention. + - Existing regression coverage was confirmed strong for three of the four "already-conformant" requirements: Req 6 (`test_term_safety_adapter.c:646-780`, explicit bidirectional advisory-vs-authoritative pins) and Req 8 (`test_persist_recovery.c`, `test_config_repl.c`) already lock the guarantees. Req 5 has partial coverage (`test_commit_barrier_rollout.c`, `test_commit_barrier_reply.c`) but no test was found asserting batch-wide failure propagation specifically — flagged as a small net-new test item, not a code gap. + - No existing test exercises `vote_ep_err_handler` at all (`grep` across `test_ha_vote_send.c` for the handler name, `RDHUP`, or `on_err` returned zero matches) — Req 4 needs net-new test infrastructure, not just a net-new test case. This is a real (small) infrastructure gap, not a research unknown anymore. + - No existing test was found asserting that a WAL catch-up reject actually *sends* `WalAckReply{success=0}` on the wire (as opposed to testing what happens downstream once a NACK is routed) — the bug-1479 fix itself is under-tested at the reply-construction boundary. Folded into this feature's Testing Strategy as a regression-lock item for Req 2.1. + +## Research Log + +### Cap'n Proto schema regeneration path +- **Context**: Requirements 2 and 7 both need `ReplConfigPushReply` to gain a `term` field; needed to confirm this doesn't require a Nix/build change given the historical `nixSupport/xce.nix` capnpc-pin issue (bug-918, memory-recorded from a prior session). +- **Sources Consulted**: `src/lib/meson.build` (read directly), `src/schema/controller.capnp` (read directly). +- **Findings**: `src/lib/meson.build:1-10` unconditionally regenerates `controller.capnp.c/.h` from `src/schema/controller.capnp` on every build via `capnp compile -o c:lib` using the `capnpc-c` plugin and the `c-capnproto` dependency. Bug-918 was about the Nix derivation's *own* pin for the `c-capnproto` toolchain source (a mutable upstream `main` ref), not about schema content — an additive field is orthogonal to that concern. +- **Implications**: No meson/Nix change needed for the schema addition; a normal `/xce-build controller` (or `all`) picks it up. No new Technology Stack row needed beyond noting the existing Cap'n Proto toolchain already covers this. + +### Existing reply-hook test pattern +- **Context**: Needed a concrete, low-risk way to unit-test the new config-push reject-reply construction without standing up a live endpoint pair. +- **Sources Consulted**: `ha.c:3085-3131` (`ha_wal_ack_send_hook`, `ha_send_wal_ack_reply_ex`, `ha_send_wal_ack_reply`), read directly. +- **Findings**: The WAL-ACK path already has exactly this shape: an `XCE_TESTING`-guarded global function pointer that, when set, receives the constructed reply payload instead of the function sending over the wire. This is bug-1479's own test-support mechanism. +- **Implications**: The config-push reject-reply fix should add an analogous `XCE_TESTING`-only hook (e.g. `ha_config_push_reply_send_hook`) rather than inventing a different test-injection mechanism — keeps the two reply-integrity fixes symmetric and reviewable by the same pattern. + +### Regression-coverage confirmation for Requirements 5, 6, 8 +- **Context**: Gap analysis flagged these as "Unknown — test-coverage only"; needed to resolve before Testing Strategy could be written concretely. +- **Sources Consulted**: `grep` across `src/controller/testsuite/*.c` for the traced functions/concepts, read matched line ranges directly. +- **Findings**: Requirement 6 has strong existing dedicated coverage (`test_term_safety_adapter.c`, tests explicitly pin both directions: a lagging advisory index does not cap `committed_lsn`, and a well-ahead advisory index does not raise it past the durable-majority floor). Requirement 8 has existing coverage in `test_persist_recovery.c` and `test_config_repl.c`. Requirement 5 has partial coverage; no test specifically named or scoped to "one failed payload in a batch propagates to all" was found. +- **Implications**: Requirements 6 and 8 need no new tests — the design's Testing Strategy references the existing test files as the regression lock. Requirement 5 gets one small net-new test item (batch failure propagation) rather than a full new suite. + +### Vote endpoint failure-path test infrastructure +- **Context**: Needed to confirm whether `vote_ep_err_handler`'s failure path (the Requirement 4 fix target) has any existing test scaffolding. +- **Sources Consulted**: `grep -n "vote_ep_err_handler\|RDHUP\|on_err" src/controller/testsuite/test_ha_vote_send.c` — zero matches. +- **Findings**: No existing test drives `vote_ep_err_handler` at all, for either the already-fixed connect-time paths or the not-yet-fixed post-connect path. This is a genuine test-infrastructure gap (need a way to invoke the handler directly with a synthetic `vote_ep_ctx_t`/endpoint, e.g. a small `XCE_TESTING`-only constructor mirroring `vote_ep_ctx_build_for_test` at `ha.c:7337`, which already exists for a different purpose and can likely be reused/extended). +- **Implications**: Requirement 4's task will need a small test-support addition (reusing `vote_ep_ctx_build_for_test`), not just a new test case in isolation. + +## Architecture Pattern Evaluation + +| Option | Description | Strengths | Risks / Limitations | Notes | +|--------|-------------|-----------|---------------------|-------| +| Extend in place (chosen for all code fixes) | Add the missing reply/routing logic directly inside the existing adapter functions (`handle_repl_config_push`, `vote_ep_err_handler`) | Matches the bug-1479 precedent exactly; no new abstraction; minimal review surface | None material — these are narrow, well-bounded functions already | Consistent with `ha_send_wal_ack_reply_ex`'s own extension of `ha_send_wal_ack_reply` | +| New shared "reply integrity" abstraction (rejected) | A generic cross-cutting helper/interface for "send an explicit reply on every reject path" spanning WAL-ACK, config-push, and vote replies | Would prevent the class of bug from recurring elsewhere by construction | The three reply shapes (`WalAckReply`, `ReplConfigPushReply`, `RequestVoteReply`) are distinct Cap'n Proto structs with different fields and different dispatch semantics (one is a direct reply, one is a tally-feed); forcing a shared interface over them adds indirection with only three call sites — fails the Simplification lens (no second concrete beneficiary today) | Documented here so a future spec doesn't have to re-derive why this was rejected | + +## Design Decisions + +### Decision: Documentation-only resolution for the dead nextIndex-driven AppendEntries sender (Requirement 3) +- **Context**: `raft_send_append_entries`/`ha_cb_send_append_entries_stub` is fully protocol-conformant but has zero production callers; `repl_broadcast` + catch-up streaming is the actual production mechanism. +- **Alternatives Considered**: + 1. Retire the dead path (remove production wiring, keep library-only/test-only). + 2. Wire it in as the real production path, replacing `repl_broadcast`. + 3. Formally document it as intentionally dormant, matching the reasoning already recorded at `test_ha_core_safety.c:2474`. +- **Selected Approach**: Option 3. No source code changes. Update `src/controller/CLAUDE.md`'s TLA+ Action-to-Code Mapping to note `AppendEntries(i,j)` production behavior is `repl_broadcast`/`ha_stream_wal_to_standby`, with `raft_send_append_entries` explicitly marked as a dormant, protocol-exact reference path exercised only by `raft_sim`/tests. Add a one-line cross-reference note to `ha-term-safety/spec.json`'s existing `known_limitations` entries (index 30) pointing at this spec's resolution, so a future reader lands on the authoritative decision instead of re-discovering the drift. +- **Rationale**: A prior investigation already weighed retire-vs-keep and rejected retirement because the term-blind branches this path would otherwise expose are unreachable with real data today and independently guarded by `persist_wal_write_replicated`'s conflict guard even if reached. Re-litigating that decision without new information would violate the Simplification lens in reverse (removing working, guarded code for documentation tidiness alone). Wiring it in (Option 2) is rejected as disproportionate risk (XL effort, full chaotic-soak reverification) for zero confirmed live defect in the current mechanism. +- **Trade-offs**: Keeps two implementations of the same guarantee in the codebase long-term (a documentation cost); avoids all correctness/regression risk. +- **Follow-up**: Requirement 3's task should be scoped as a documentation task with zero `src/controller/*.c` diff; reviewers should treat any code-touching PR for this requirement as scope creep unless a new live defect is found. + +### Decision: Split `vote_ep_err_handler` into two handlers sharing a helper (Requirement 4) +- **Context**: `vote_ep_ctx_t` has no field distinguishing a real-vote endpoint from a PreVote endpoint, and the shared handler's election-phase branch calls the legacy `handle_request_vote_reply` instead of the production tally path for post-connect failures. +- **Alternatives Considered**: + 1. Add a boolean discriminant field to `vote_ep_ctx_t` and branch inside the one handler. + 2. Split into `vote_ep_err_handler` / `pre_vote_ep_err_handler`, each registered at its existing distinct call site, sharing a small helper for the identical `CTRL_PRIMARY` cleanup branch. +- **Selected Approach**: Option 2. +- **Rationale**: The two endpoint kinds are *already* registered at distinct call sites today (`ha.c:688-689` vs `827-828`) even though they share the `vote_ep_ctx_t` type — the split mirrors an architectural seam that already exists, rather than introducing a new one. It avoids adding a field that only exists to support a runtime branch in one function. +- **Trade-offs**: Two small handler functions instead of one slightly larger one; a shared static helper for the `CTRL_PRIMARY` branch avoids duplicating that logic. +- **Follow-up**: The task should reuse `vote_ep_ctx_build_for_test` (`ha.c:7337`) as the test-construction seam for both new handlers' unit tests, per the test-infrastructure finding above. + +## Risks & Mitigations +- Adding `term` to `ReplConfigPushReply` changes a wire struct consumed during rolling upgrades — mitigated because Cap'n Proto field addition is backward/forward compatible by construction (old readers ignore the new field; an old sender's reply decodes with `term == 0` on a new-code primary, which is naturally safe since `0` can never look like a *higher* term than the primary's own and so triggers no adoption — see Migration Strategy in `design.md`). +- Splitting `vote_ep_err_handler` touches live election-path code — mitigated by keeping the `CTRL_PRIMARY` branch behavior byte-for-byte identical (extracted, not rewritten) and requiring the new dedicated unit tests (via the reused test-construction helper) before this task is considered done. +- No test currently exists for the exact reply-construction boundary of the already-shipped bug-1479 fix — mitigated by adding it as an explicit Requirement 2.1 regression-lock test in this feature rather than assuming the existing catch-up/fence tests already cover it. + +## References +- `src/controller/testsuite/test_ha_core_safety.c:2440-2480` — the prior "DOCUMENT SAFE-BY-GUARD, do not structurally retire" decision informing Requirement 3. +- `src/lib/meson.build:1-10` — Cap'n Proto codegen custom_target. +- `src/controller/ha.c:3085-3131` — `ha_send_wal_ack_reply_ex`/`ha_wal_ack_send_hook`, the precedent pattern for Requirement 2's test hook. diff --git a/.kiro/specs/raft-adapter-conformance/spec.json b/.kiro/specs/raft-adapter-conformance/spec.json new file mode 100644 index 0000000..240daf7 --- /dev/null +++ b/.kiro/specs/raft-adapter-conformance/spec.json @@ -0,0 +1,25 @@ +{ + "feature_name": "raft-adapter-conformance", + "created_at": "2026-07-29T03:10:00Z", + "updated_at": "2026-07-29T09:20:00Z", + "language": "en", + "phase": "tasks-generated", + "approvals": { + "requirements": { + "generated": true, + "approved": true + }, + "design": { + "generated": true, + "approved": true + }, + "tasks": { + "generated": true, + "approved": true + } + }, + "ready_for_implementation": true, + "blocked_on": [], + "related_bugs": ["bug-1479", "bug-1480", "bug-1481", "bug-1466", "bug-1471", "bug-1472", "bug-1474", "bug-1475", "bug-1477", "bug-1478", "bug-1423"], + "related_specs": ["raft-log-replication", "raft-commit-safety", "ha-term-safety", "raft-sim-conformance", "config-upgrade-snapshot", "ha-config-bootstrap", "ha-commit-engine"] +} diff --git a/.kiro/specs/raft-adapter-conformance/tasks.md b/.kiro/specs/raft-adapter-conformance/tasks.md new file mode 100644 index 0000000..22b9a75 --- /dev/null +++ b/.kiro/specs/raft-adapter-conformance/tasks.md @@ -0,0 +1,127 @@ +# Implementation Plan + +- [x] 1. Foundation: extend the configuration-push reply schema with a term field + - Add `term @2: UInt64` to `ReplConfigPushReply` in `src/schema/controller.capnp`, alongside the existing `accepted`/`versionTag` fields + - Rebuild the controller so the Cap'n Proto codegen `custom_target` regenerates `controller.capnp.c/.h` with the new field + - Observable: `repl_config_push_reply_t` exposes a `term` member usable from `config_repl.c` and `cluster.c`; existing config-push tests still build and pass unmodified + - _Requirements: 7.4_ + +- [ ] 2. Core: configuration-push reply integrity +- [x] 2.1 (P) Send an explicit accept/reject reply carrying term on every configuration push outcome + - In `handle_repl_config_push`, construct and send `ReplConfigPushReply{accepted=0, term=current_term}` on each of the four reject early-returns (malformed request, missing bytes/sha256, sha256 mismatch, `conf_save_config` failure) instead of returning without a reply + - Populate `term` on the existing success reply path too + - Preserve the existing `-EAGAIN`-from-`config_activate_committed` behavior unchanged: that path still sends `accepted=1` (activation-deferred is not a rejection) + - Add an `XCE_TESTING`-only send-hook (mirroring `ha_wal_ack_send_hook`) so a unit test can observe the constructed reply payload without a live endpoint + - Observable: every code path through `handle_repl_config_push` now sends exactly one `ReplConfigPushReply`, with no path returning silently + - _Requirements: 2.2, 2.3, 2.5, 7.4_ + - _Boundary: config_repl.c reply construction_ + +- [x] 2.2 (P) Wire term-adoption into the primary-side configuration-push reply handler + - In the existing `ReplConfigPushReply` branch of `myreq_handler` (`cluster.c`, the code that already checks `cack->accepted` and calls `repl_on_config_ack` or warns-and-ignores), add a term comparison: when `cack->term` exceeds the primary's current term, call `raft_on_higher_term_observed` — the same adoption entry point the heartbeat-reply and WAL-NACK vectors already use + - Do not alter the existing accept/reject branching logic itself, only add the term check alongside it + - Observable: a config-push reply carrying a higher term causes the primary to adopt that term and step down from leadership held at the lower term + - _Requirements: 7.4, 7.5_ + - _Boundary: cluster.c reply handling_ + +- [x] 2.3 Test configuration-push reply integrity end-to-end + - Unit test: each of the four reject conditions in `handle_repl_config_push` produces `accepted=0` with the current term, via the new send-hook + - Unit test: the `-EAGAIN` activation-defer path still produces `accepted=1` + - Unit test: an inbound config-push reply carrying a higher term triggers adoption via the `cluster.c` wiring from 2.2 + - Observable: new tests in `test_config_repl.c` fail against pre-fix code and pass against the code from 2.1/2.2 + - _Requirements: 2.2, 2.3, 2.4, 2.5, 7.4, 7.5_ + - _Depends: 2.1, 2.2_ + +- [ ] 3. Core: vote and pre-vote endpoint failure routing +- [x] 3.1 (P) Split the shared vote-endpoint error handler and route post-connect failures to the production tally + - Split `vote_ep_err_handler` into a real-vote handler (registered at its existing connection-setup call site) and a `pre_vote_ep_err_handler` (registered at its existing, separate PreVote connection-setup call site) + - Extract the identical `CTRL_PRIMARY`-role cleanup branch (standby-endpoint deregistration, `repl_remove_standby`, quorum-transition logging) into one shared helper called by both, unchanged in behavior + - Change each handler's election-phase branch to route a post-connect failure through the same production tally path already used for connect-time failures (`vote_reply_dispatch` for the real-vote handler, `pre_vote_reply_dispatch` for the pre-vote handler) instead of the legacy `handle_request_vote_reply` + - Observable: a failure arriving after a vote or pre-vote endpoint has already connected now reaches the same tally counter a connect-time failure or a delivered denial would + - _Requirements: 4.2, 4.3, 4.4_ + - _Boundary: ha.c vote endpoint handlers_ + +- [x] 3.2 Test post-connect vote and pre-vote failure routing + - Extend the existing test-construction helper (`vote_ep_ctx_build_for_test`) to synthesize a post-connect failure on a real-vote endpoint and assert it reaches `vote_reply_dispatch`'s tally + - Do the same for a PreVote endpoint against `pre_vote_reply_dispatch` + - Confirm a round where every peer's outcome is now counted (including this failure mode) reaches a quorum decision without waiting for the full round timeout + - Observable: new tests in `test_ha_vote_send.c` fail against pre-fix code (tally never updates) and pass against the code from 3.1 + - _Requirements: 4.2, 4.3, 4.5_ + - _Depends: 3.1_ + +- [ ] 4. Core: document the dormant AppendEntries sender and guard it against silent regression +- [x] 4.1 Record the production-authoritative send mechanism and add a non-regression guard + - Extend the `on_send_append_entries` doc-comment (`ha.c`, the `ha_cb_send_append_entries_stub` callback) to state plainly that this callback is reachable only via `raft_send_append_entries`, which has no production caller, and that `repl_broadcast`/`ha_stream_wal_to_standby` are the actual production `AppendEntries`-equivalent send/retry/backoff mechanism + - Add an `XCE_TESTING`-only call counter to `ha_cb_send_append_entries_stub` + - Observable: the counter exists and is queryable from a test; the doc-comment names both the dormant path and the live substitute explicitly + - _Requirements: 3.3_ + +- [x] 4.2 Test that the dormant sender stays uncalled in production + - Drive the production heartbeat/replication path end-to-end in a test and assert the new call counter stays at zero + - In the same test, confirm `repl_broadcast`/`ha_stream_wal_to_standby` did fire for the same scenario, proving the assertion isn't vacuous + - Observable: the test fails if a future change accidentally gives `raft_send_append_entries` a production caller + - _Requirements: 3.3_ + - _Depends: 4.1_ + - _Boundary: test_ha_core_safety.c_ + +- [ ] 5. Core: regression-lock tests for already-shipped reply and append behavior +- [x] 5.1 (P) Test that a WAL catch-up rejection actually sends the reply on the wire + - Add a test asserting `ha_send_wal_ack_reply_ex(success=0)` is invoked (via the existing `ha_wal_ack_send_hook`) when a WAL catch-up entry is rejected, closing the reply-construction-boundary coverage gap that existed alongside the already-shipped bug-1479 fix + - Observable: new test in `test_ha_core_safety.c` fails if the reject branch is ever changed back to a silent drop + - _Requirements: 2.1_ + - _Boundary: test_ha_core_safety.c_ + +- [x] 5.2 (P) Test that one failing payload in a submitted batch propagates to the whole batch + - Add a test asserting `persist_submit_job_payloads_async` resolves every payload in a batch with the first failure's outcome when one payload fails to persist, rather than completing a subset + - Observable: new test in `test_commit_barrier_reply.c` fails if a future change lets a batch partially succeed + - _Requirements: 5.3_ + - _Boundary: test_commit_barrier_reply.c_ + +- [x] 6. Integration: extend the controller's durable conformance record with this feature's findings + - Update `src/controller/CLAUDE.md`'s "TLA+ Action-to-Code Mapping" table and "Protocol Verification Checklist" with corrected/added rows covering: `AppendEntries` reply integrity (WAL catch-up and configuration push), vote/PreVote failure routing across all failure timings, and the dormant-sender resolution from task 4 + - Append a one-line pointer to the existing `known_limitations` entry (index 30) in `.kiro/specs/ha-term-safety/spec.json`, referencing this spec's resolution of the dormant `on_send_append_entries` send-path drift + - Observable: the CLAUDE.md table cites the current, post-fix code paths for every action this feature touched, with no reference to the pre-fix silent-drop behavior as if it were still current; a reader of `ha-term-safety`'s known_limitations lands on this spec's resolution instead of re-discovering the drift + - _Requirements: 1.1, 1.2, 1.3, 1.4, 1.5, 1.6_ + - _Depends: 2.1, 2.2, 3.1, 4.1, 4.2_ + +- [ ] 7. Validation: regression confirmation and live verification +- [x] 7.1 (P) Confirm append and commit-source regression coverage is unaffected + - Run `test_commit_barrier_rollout.c`, `test_commit_barrier_reply.c` (including the new test from 5.2), and `test_term_safety_adapter.c` and confirm all pass without modification to the already-conformant code they exercise + - Observable: test run output confirms client-append-integrity and durable-majority-authoritative behavior are unchanged + - _Requirements: 5.1, 5.2, 5.4, 6.1, 6.2, 6.3, 6.4_ + - _Depends: 5.2_ + - _Boundary: test_commit_barrier_rollout.c, test_commit_barrier_reply.c, test_term_safety_adapter.c_ + +- [x] 7.2 (P) Confirm election, replication, and recovery regression coverage is unaffected + - Run `test_ha_core_safety.c` (including the new tests from 5.1 and 4.2), `test_ha_vote_send.c` (including the new tests from 3.2), `test_persist_recovery.c`, and `test_config_repl.c` (including the new tests from 2.3; also confirms 2.4's existing timeout/unknown-outcome handling, unchanged) and confirm all pass + - Run `test_repl_catchup.c`, `test_repl_unit.c`, `test_repl_majority.c`, and `test_ha_repl_push.c` and confirm all pass, closing the coverage gap for the Requirement 3 retry/backoff/catch-up-streaming-ceiling regression lock (`ha_raft_on_repl_nack`, `repl_start_catchup`, `repl_broadcast`) + - Observable: test run output confirms the already-fixed retry/backoff, catch-up streaming ceiling, connect-time vote-failure routing, term-adoption vectors, restart/recovery reconcile, and the new dormant-sender guard all remain correct + - _Requirements: 2.4, 3.1, 3.2, 3.3, 3.4, 4.1, 4.4, 7.1, 7.2, 7.3, 7.5, 8.1, 8.2, 8.3, 8.4_ + - _Depends: 5.1, 2.3, 3.2, 4.2_ + - _Boundary: test_ha_core_safety.c, test_ha_vote_send.c, test_persist_recovery.c, test_config_repl.c, test_repl_catchup.c, test_repl_unit.c, test_repl_majority.c, test_ha_repl_push.c_ + +- [x] 7.3 Live soak: configuration-push rejection end-to-end + - Run a rolling chaotic-failover soak where the test driver issues a configuration push whose payload deliberately does not match its advertised sha256, exercising the real `handle_repl_config_push` SHA-256-mismatch reject branch + - Observable: the soak log shows the primary receiving and logging the explicit reject rather than a timeout + - _Requirements: 2.2, 2.3, 2.5, 7.4, 7.5_ + - _Depends: 2.1, 2.2_ + +- [x]* 7.4 (P) Live soak: vote/PreVote post-connect failure end-to-end (optional, defer if no fault-injection mechanism exists) — NOT deferred, ran successfully + - Attempt a soak round that severs an already-established outbound vote connection before a reply arrives (e.g. a firewall-rule toggle or proxy in the soak harness); if no such mechanism exists cheaply in `xce-test-ha`, defer this task — the unit tests from 3.2 already give deterministic coverage of the fix itself + - Observable, if run: the soak log shows the affected round reaching a quorum decision within the fast-tally path rather than the full election timeout + - _Requirements: 4.2, 4.3, 4.5_ + - _Depends: 3.1_ + - _Boundary: xce-test-ha soak harness_ + +## Implementation Notes + +- Task 1: adding a `$C.mapname`-tagged capnp field requires a companion edit to the hand-written C struct in `src/include/typemap.h` (the codegen writes into that struct by name; it does not synthesize it). `ReplConfigPushReply.term` required `struct repl_config_push_reply_s.term` in typemap.h — design.md's File Structure Plan didn't call this out, but it's the established, required pattern for every existing `$C.mapname` struct in that file, not scope creep. Any future task adding a capnp field should expect the same pairing. +- Authoritative test verification recipe (confirmed working): `rm -rf /tmp/xce_*` then run `ASAN_OPTIONS=detect_leaks=0 src/xce.build/controller/controller_unit_test` directly and read its own stdout `N Tests M Failures` line — meson's aggregate Ok/Fail can show a spurious TIMEOUT/inline FAIL under its own harness even when the direct binary run is clean (1053 Tests 0 Failures confirmed for task 1's baseline). +- Task 2.2 (bug-1482): `myreq_handler`'s first unconditional step is `xce_decode(pkt, &request)`, which itself unconditionally `free_packet(pkt)` + frees the `io_packet_t` struct before returning on every path — `pkt` ownership transfers into `xce_decode`, the caller must never touch/free it afterward. Any new `_for_test` wrapper around `myreq_handler` (or `xce_decode` callers generally) must document this, not the reverse ("caller owns/frees pkt") — that wrong assumption is what caused the original test-only wrapper's doc comment to mislead a reviewer into requesting a double-free. +- Task 2.2: driving a test through `cluster.c`'s real `myreq_handler` (rather than testing extracted logic in isolation) requires adding `cluster.c` to `controller_unit_test_src` in `meson.build` plus link-satisfying fakes for symbols its OTHER unrelated switch-cases reference (task.c/opget.c/sched.c/apiserver.c/myconf.c) — this is pre-existing, established convention in this codebase (`test_worker_join.c`, `test_commit_barrier_reply.c` already do it for the same reason), not scope creep. Any new test driving `myreq_handler` end-to-end should expect this same footprint. +- New test-only wrappers exposing a `static` production dispatch function (the `_for_test` pattern, e.g. `peer_ctrl_msg_handler_for_test`, `myreq_handler_for_test`) MUST be wrapped in `#ifdef XCE_TESTING`/`#endif` — the source file compiles into the production binary too, and an unguarded wrapper ships as a new linked symbol in production with zero production purpose. +- Task 3.2 (bug-1483, not fixed): driving a PreVote round to `RAFT_PRE_VOTE_LOST` in a unit test (`c==NULL`) without first stubbing `ha_prevote_rearm_liveness_hook` falls through to the real `ha_arm_heartbeat_timeout_vtask`, which callocs into the static `s_liveness_ctx` and never frees it when `c==NULL` short-circuits the scheduling guard. `test_ha_prevote.c`'s existing LOST-path tests already stub-and-reset this hook — any new PreVote-round test that reaches LOST must do the same. +- `pre_vote_reply_dispatch` has no `XCE_TESTING` mock-hook seam (unlike `vote_reply_dispatch`'s `xce_vote_reply_hook`) — it calls `raft_on_pre_vote_reply` directly. Tests verifying PreVote routing must assert on `raft_state_t`'s own tally fields (`pre_vote_replies[]`, `pre_votes_granted`, `pre_vote_in_progress`) instead, per `test_ha_prevote.c`'s established technique. +- Task 7.2 (bug-1484, residual gap, NOT fixed — outside this spec's task list): no test anywhere in `testsuite/` drives the real `repl_ack_decode_and_dispatch` path and asserts `raft_on_higher_term_observed` fires for either the heartbeat-reply (ha.c ~6690-6711) or WAL-NACK (ha.c ~6805-6814) term-discovery vector bug-1421 introduced. `test_intake_higher_term_heartbeat_adopts_term` looks like it covers this but actually drives a different AE-request code path. Requirement 7.5's "already verified" premise currently rests on unverified ground for these two vectors specifically (the third, config-push, vector added by this feature IS tested — task 2.2). A future task should add a dedicated test mirroring `test_config_push_reply_higher_term_adopts_and_steps_down`'s pattern for the other two. +- Task 7.3: the real elected-primary's own outbound config-push has no TOCTOU window to inject a sha256 mismatch without new production/relay code (primary hashes and pushes from the same in-memory buffer) — confirmed by reading `config_commit_change`/`push_config_to_standbys`. Live soaks of this specific reject path must act as a direct client/sender against a standby (using `xce_replconfigpush_req_raw`, the real production wire function) rather than corrupting a real primary's push; decode the `ReplConfigPushReply` envelope via `xce_reply()`'s `Request{opcode:reply, body.replymsg}` wrapper (not a bare `RequestReply`) to get real accepted/term content instead of only inferring correctness from the receiver's local log line. +- Task 7.4: found a clean, cheap, reusable live fault-injection technique for "post-connect, pre-reply" endpoint failures — vote/PreVote endpoints are TLS (`ep->ssl = SSL_new(...)`), and `endpoint_connect()`'s return value comes only from the TCP-level `socket_connect()`, never from the TLS handshake (`netio.c:875-903`). Standing up a throwaway TCP listener on a configured peer's port that accepts-then-closes without any TLS bytes makes `endpoint_connect()` succeed (so the candidate genuinely reaches "connected") while deterministically causing an async `SSL_do_handshake` failure milliseconds later — landing squarely in `vote_ep_err_handler`/`pre_vote_ep_err_handler` (task 3.1's fix target), never the already-fixed synchronous connect-refused path (bug-1423). `iptables`/`nft` aren't installed in this sandbox and `tc netem` needs `CAP_NET_ADMIN` (not available); ptrace/gdb mid-flight attach is blocked by `yama ptrace_scope=1`. This accept-then-close-impostor technique generalizes to any "TLS-tier endpoint fails after TCP connect" live-soak need. +- `xce-deploy-ha/SKILL.md` documents `VERBOSE=-vvv scripts/start.sh ctrl-N &`, but `start.sh` never reads `$VERBOSE` — only positional args. Use `-vvv` as a positional arg (`scripts/start.sh ctrl-N -vvv &`), matching `xce-test-ha/SKILL.md`'s documented form, not the env-var form. diff --git a/.kiro/specs/scheduler-allocation/brief.md b/.kiro/specs/scheduler-allocation/brief.md new file mode 100644 index 0000000..08b01d5 --- /dev/null +++ b/.kiro/specs/scheduler-allocation/brief.md @@ -0,0 +1,210 @@ +# Brief: scheduler-allocation + +## Problem + +The XCE scheduler has a plugin architecture (`plugin.h`/`plugin.c`, `xce_sched_plugin_t`) but three gaps keep it from being a real framework. First, job selection policy is hardcoded: `sched_job_picker()` sets `job_pick_plugin = "xce_sched_fcfs"` as a literal, so swapping policies requires recompilation. Second, parallel job allocation is a stub: `parjob_allocator.c`'s `my_alloc()` takes `(plugin, ctx)` and immediately `return 0` -- any job with `maxTasks > 1` (routed there by `sched_make_primary_alloc_()`) produces no allocation at all. Third, allocation is eager and one-shot: the sibling `seqjob_allocator.c`'s `my_alloc()` (used when `maxTasks == 1`) calls `sched_collect_workers()` then `xlist_find()` for the first host that satisfies the request and stops -- there is no mechanism to generate alternative host/slot combinations and retry when the first plan fails. + +The first gap (hardcoded picker) is addressed in the sibling **scheduler-core** spec. This spec, **scheduler-allocation**, closes the other two: the parjob stub and one-shot allocation. + +## Current State + +### What exists (allocation surface) + +- **Seqjob allocator** (`seqjob_allocator.c`): handles `maxTasks == 1`. Checks shared resources, collects workers via `sched_collect_workers()`, tries one host, returns first match. No retry with alternative plans. +- **Parjob allocator stub** (`parjob_allocator.c`): registered as a plugin but `my_alloc()` is empty (`return 0`). Any job with `maxTasks > 1` silently fails allocation. +- **Resource request types** (`resreq.h`): PRIMARY (minTasks/maxTasks/select/rusages/span/same/affinity), COMPOUND (list of primaries), ALTER (list of compounds). The type hierarchy is well-defined but allocation at the PRIMARY leaf lacks iteration abstractions. +- **Select expression evaluator** (`resreq.h`): full parser/evaluator with per-session memoization (`select_eval_ctx_t`) and inter-session GC. Already reusable for host filtering. +- **Shared resources** (`xce_scheduler_t.sharedInst`/`sharedInUse`): zarray of resource values tracked per scheduling session. +- **Allocation dispatch** (`scheduler.c:sched_make_allocation()`, `sched_make_primary_alloc_()`): routes to seqjob or parjob allocator based on `maxTasks`. + +### What's missing + +- **Lazy plan generation**: no `xce_alloc_plan_iter_t` -- plans are not generated at all, let alone lazily +- **Lazy host iteration**: no `xce_host_iter_t` -- host collection is eager via `sched_collect_workers()`, materializing the full list before trying any +- **Parallel job allocation**: `parjob_allocator` is a stub. No combinatorial plan generation (1host x N, 2hosts x ceil(N/2), ..., Nhosts x 1), no multi-slot host matching +- **Unsatisfiable resreq caching**: a batch of similarly-shaped unsatisfiable jobs each re-pays the full allocation cost within a session + +## Desired Outcome + +### Iterator-Driven Allocation Architecture + +A lazy `xce_alloc_plan_iter_t` (candidate `(nhosts, slots_per_host)` plans, most-preferred first) composed with a lazy `xce_host_iter_t` (candidate hosts for a given plan, filtered by the existing select-expression evaluator), a `parjob_allocator` implementation that walks the plan iterator to do real combinatorial multi-slot allocation, and a session-scoped unsatisfiable-resreq fingerprint cache so a job whose resreq no plan can satisfy doesn't re-pay full allocation cost for every later job with the same fingerprint in the same scheduling session. + +### Three-Layer Iterator Composition + +``` +ALTER -> OR-of-compounds: first compound that fully allocates wins (unchanged) + └─ COMPOUND -> AND-of-primaries: ALL primaries must allocate (unchanged) + └─ PRIMARY -> plan_iter -> host_iter -> try_alloc (NEW iterator layer) +``` + +The iterator composition operates at the **PRIMARY leaf**. COMPOUND and ALTER are composition rules above the iterators — they call into the same primary allocator, unchanged from today. + +### Iterator Pipeline + +``` +xce_alloc_plan_iter_t -- init(resreq) -> next() -> plan -> next() -> ... -> NULL -> fini() + │ plan + ▼ +xce_host_iter_t -- init(plan, workers) -> next() -> worker -> ... -> NULL -> fini() + │ worker + ▼ +try_alloc(worker, plan) -- check slots, shared res, commit or advance +``` + +### Key Properties + +- **Lazy**: `plan_iter->next()` generates one plan at a time. `host_iter->next()` returns one host at a time. No full materialization. +- **Cancel-safe**: both `next()` calls have `pthread_cancel` cancellation points. +- **Independent lifecycles**: a `host_iter` is created from a plan, used, and destroyed; the `plan_iter` is advanced to the next plan only after the `host_iter` is done. +- **COMPOUND/ALTER unchanged**: the composition rules above the PRIMARY leaf are unchanged from today. +- **Seqjob rewrap**: `seqjob_allocator` is rewrapped onto the iterator interfaces as a trivial case — its plan iterator always returns the single plan (1 host x 1 slot). This validates the abstraction before applying it to the complex parjob case. + +## Alternatives Considered + +### Approach A: Incremental Enhancement (rejected) + +| Aspect | Detail | +|--------|--------| +| **Plan generation** | Pre-computed plan array. Eager generation for parjob. | +| **Host iteration** | No new abstraction. Simple for-loop over `sched_collect_workers()` result. | +| **Unsatisfiable resreq** | `xlist_t unsatisfiable_resreqs` in session state | + +**Rejected because:** Eager plan generation causes memory pressure for large combinatorial spaces. No reusable abstraction — each new allocator reimplements the loop. Short-term win, long-term rework cost. + +### Approach B: Iterator-Driven Allocation (chosen) + +| Aspect | Detail | +|--------|--------| +| **Plan iterator** | `xce_alloc_plan_iter_t` — lazy, cancel-safe, generates one plan per `next()` call | +| **Host iterator** | `xce_host_iter_t` — lazy per-plan host filtering via existing select-expression evaluator | +| **Parallel jobs** | Combinatorial plan generation: 1host x N -> 2hosts x ceil(N/2) -> ... -> Nhhosts x 1 | +| **Unsatisfiable resreq** | Session-level fingerprint cache: `{select, rusage, user, queue, project}` | +| **Seqjob path** | Trivial rewrap — single plan (1x1) through the same iterator interfaces | + +**Chosen because:** Lazy generation avoids memory pressure. Iterator composition matches the resreq type hierarchy naturally. Seqjob rewrap validates the abstraction on the simple case before applying it to the complex parjob case. The cache eliminates redundant work for batches of unsatisfiable jobs. + +### Decision Rationale + +Approach B chosen over A because the iterator abstraction pays off immediately (parjob combinatorial allocation) and compounds (every future allocator reuses it). The two-iterator composition (plan -> host -> try_alloc) is a proven pattern: the plan iterator answers "how many hosts, how many slots each?", the host iterator answers "which specific hosts can fulfill this plan?", and the allocator commits or advances. This separation of concerns makes each layer independently testable. + +## Approach + +**Iterator-Driven Allocation**: + +### PRIMARY leaf allocation pseudocode + +```c +int allocate_primary(sched, primary_resreq, ctx) { + plan_iter = plan_iter_init(primary_resreq, sched); + while ((plan = plan_iter->next(plan_iter)) != NULL) { + host_iter = host_iter_init(plan, sched->workers); + while ((worker = host_iter->next(host_iter)) != NULL) { + if (try_alloc_on_host(worker, plan, ctx) > 0) { + host_iter->fini(host_iter); + plan_iter->fini(plan_iter); + return ALLOC_SUCCESS; + } + } + host_iter->fini(host_iter); + } + plan_iter->fini(plan_iter); + return ALLOC_FAIL; +} +``` + +### Who uses this composition + +| Allocator | `maxTasks` | Plan iterator | Host iterator | Behavior | +|-----------|------------|---------------|---------------|----------| +| `seqjob_allocator` | `== 1` | Trivial: single plan (1 host x 1 slot) | Full: filters hosts by select expression | Unchanged from today — first matching host wins | +| `parjob_allocator` | `> 1` | Full combinatorial: 1hostxN, 2hosts x ceil(N/2), ..., Nhosts x 1 | Full: filters hosts with enough available slots | New — walks plans until one succeeds | +| Future allocators | any | Custom strategy (e.g., topology-aware, bin-packing) | Reuses same `xce_host_iter_t` | Pluggable via `job_alloc_fn` | + +### Unsatisfiable resreq cache + +```c +// Per-session cache on xce_scheduler_t +// Key: fingerprint of {select, rusage, user, queue, project} +// Cleared at begin_session() +// Populated when a job's plan iterator exhausts without success +// Checked before starting allocation for each job — hit = immediate pend +``` + +### What stays unchanged + +- `seqjob_allocator` externally observable behavior — rewrap is internal +- COMPOUND and ALTER resreq allocation paths — dispatch is unchanged +- Select expression system — no changes +- Shared resource tracking — no changes +- Existing plugin framework — no changes + +### What's new + +- `xce_alloc_plan_iter_t` — lazy plan iterator interface +- `xce_host_iter_t` — lazy host iterator interface +- `parjob_allocator` combinatorial plan generation +- Session-level unsatisfiable resreq fingerprint cache +- Seqjob rewrap onto iterator interfaces (trivial case, behavior unchanged) + +## Scope + +### In + +- `xce_alloc_plan_iter_t` interface: `init(resreq, sched)`, `next() -> plan`, `fini()` +- `xce_host_iter_t` interface: `init(plan, workers)`, `next() -> worker`, `fini()` +- `parjob_allocator` combinatorial plan generation (1host x N, 2hosts x ceil(N/2), ..., Nhosts x 1) via plan iterator +- `seqjob_allocator` rewrap onto iterator interfaces (trivial 1-host/1-slot case, behavior unchanged) +- Session-level unsatisfiable resreq fingerprint cache (keyed on `{select, rusage, user, queue, project}`) +- COMPOUND and ALTER resreq allocation paths unchanged — they compose over the PRIMARY leaf allocator +- Unit tests: plan generation, host iteration, cache hit/miss, seqjob rewrap equivalence +- Integration test: end-to-end multi-slot parallel job allocation + +### Out + +- Pluggable job picker interface (`xce_job_picker_iface_t`) — in **scheduler-core** +- `builtin_fcfs` picker — in **scheduler-core** +- Configurable picker plugin with per-queue override — in **scheduler-core** +- Pickers in general (Req 1, 5, 8 of scheduler-framework) — in **scheduler-core** +- Preemption (Req 6 of scheduler-framework) — in **scheduler-preemption** +- Core/driver separation (Req 10 of scheduler-framework) — in **scheduler-core** +- Queue vs Project section — in **scheduler-core** +- New job selection policies beyond what the picker interface enables — deferred +- Resreq template registry (named/shared resreq objects) — deferred +- Select expression language or evaluator changes +- GPU/topology/affinity-aware allocation — left pluggable via future allocator plugins +- Controller-side scheduling-state replication / commit-barrier wiring + +## Upstream / Downstream + +### Upstream (dependencies) + +- **scheduler-core** — the plan and host iterators consume the core event interface (`xce_core_event_t`) for worker/resource state updates, but are independently unit-testable with constructed state +- Existing plugin framework (`plugin.h`, `plugin.c`) — NO changes needed +- Existing select expression evaluator (`resreq.h`) — NO changes needed +- Existing shared resource tracking (`sharedInst`/`sharedInUse`) — NO changes needed +- Existing resreq type hierarchy (PRIMARY/COMPOUND/ALTER) — NO changes needed + +### Downstream (future consumers) + +- **Affinity/GPU allocators** — register as allocator plugins, implement custom plan iterators for topology-aware placement, reuse `xce_host_iter_t` +- **Bin-packing allocator** — custom plan iterator strategy +- **Resreq template registry** — the fingerprint cache's key can incorporate template identity when sharing is added + +## Existing Spec Touchpoints + +### Depends on +- **scheduler-core** — the iterators operate within the core's scheduling session, consuming worker and resource state pushed through the core event interface. The iterators do NOT depend on the core's driver or I/O layer — they are purely computational, operating on in-memory state. + +### Adjacent +- **scheduler-preemption** — preemption fires after allocation failure. The unsatisfiable resreq cache is populated after both allocation and preemption fail (or preemption is inapplicable). The iterator interfaces are not preemption-aware. +- **ha-consistency-invariants** — commit barrier that scheduling decisions will eventually flow through. This spec does NOT wire the barrier; it only makes allocation decisions that the barrier WILL consume. + +## Constraints + +- **C (gnu17)** — no C++, no external libraries beyond existing (pthreads) +- **Cancel-safe** — `plan_iter->next()` and `host_iter->next()` must have `pthread_cancel` cancellation points +- **Session isolation** — iterator state and resreq cache are per-session, cleared on `begin_session` +- **Backward compatible** — existing seqjob allocation behavior unchanged. COMPOUND/ALTER dispatch unchanged. New functionality is additive. +- **Memory** — lazy generation avoids materializing all combinations. Worst-case for a job needing N slots on M hosts: M x N candidate evaluations (acceptably bounded). +- **No controller dependency** — iterators are purely computational, operating on in-memory worker/resource state. They do not perform I/O or call into the controller. diff --git a/.kiro/specs/scheduler-allocation/requirements.md b/.kiro/specs/scheduler-allocation/requirements.md new file mode 100644 index 0000000..b60505a --- /dev/null +++ b/.kiro/specs/scheduler-allocation/requirements.md @@ -0,0 +1,619 @@ +# Requirements Document + +## Introduction + +The XCE scheduler has a plugin architecture (`plugin.h`/`plugin.c`, `xce_sched_plugin_t`) but three gaps keep it from being a real framework. The first gap -- job selection policy is hardcoded (`sched_job_picker()` sets `job_pick_plugin = "xce_sched_fcfs"` as a literal) -- is addressed in the sibling **scheduler-core** spec. + +This spec closes the remaining two allocation gaps: + +1. **Parallel job allocation is a stub**: `parjob_allocator.c`'s `my_alloc()` takes `(plugin, ctx)` and immediately `return 0` -- any job with `maxTasks > 1` (routed there by `sched_make_primary_alloc_()` at `scheduler.c:93-103`) produces no allocation at all. + +2. **Allocation is eager and one-shot**: the sibling `seqjob_allocator.c`'s `my_alloc()` (used when `maxTasks == 1`) calls `sched_collect_workers()` then `xlist_find()` for the first host that satisfies the request and stops -- there is no mechanism to generate alternative host/slot combinations and retry when the first plan fails. + +This spec introduces an **iterator-driven allocation architecture** with these components: + +- A lazy `xce_alloc_plan_iter_t` -- candidate `(nhosts, slots_per_host)` plans, most-preferred first +- A lazy `xce_host_iter_t` -- candidate hosts for a given plan, filtered by the existing select-expression evaluator +- A `parjob_allocator` that walks the plan iterator to do real combinatorial multi-slot allocation +- A session-scoped unsatisfiable-resreq fingerprint cache so a job whose resreq no plan can satisfy doesn't re-pay full allocation cost for every later job with the same fingerprint in the same scheduling session +- A seqjob_allocator rewrap onto the iterator interfaces as a trivial 1-plan/1-slot case, validating the abstraction before applying it to the complex parjob case + +> Full discovery context (problem, current state, alternatives considered, approach, boundary, upstream/downstream) is in `.kiro/specs/scheduler-allocation/brief.md`. + +## Boundary Context + +- **In scope**: `xce_alloc_plan_iter_t` and `xce_host_iter_t` interfaces (lazy, cancel-safe, composable); `seqjob_allocator` rewrapped onto the iterator interface as a trivial 1-plan/1-host-loop case (behavior unchanged, `maxTasks == 1` only); `parjob_allocator`'s `my_alloc()` implementing real combinatorial plan generation (1host x N, 2hosts x ceil(N/2), ..., Nhosts x 1) for `maxTasks > 1`; `xce_alloc_mode_t` on `xce_sched_ctx_t` for allocation mode (NORMAL/PREEMPT); session-level unsatisfiable-resreq fingerprint cache keyed by `xce_cache_key_t` (O(1) content hash from parsed resreq + identity); unit tests for plan generation, host iteration, cache hit/miss, seqjob rewrap equivalence; integration test for end-to-end multi-slot parallel job allocation. + +- **Out of scope**: Pluggable job picker interface (`xce_job_picker_iface_t`) -- in **scheduler-core**; `builtin_fcfs` picker -- in **scheduler-core**; configurable picker plugin with per-queue override -- in **scheduler-core**; preemption (Req 6 of scheduler-framework) -- in **scheduler-preemption**; core/driver separation (Req 10 of scheduler-framework) -- in **scheduler-core**; Queue vs Project roles -- in **scheduler-core**; new job selection policies beyond the builtin FCFS picker; a resreq template registry (named/shared resreq objects); changes to the select-expression language or evaluator; controller-side scheduling-state replication / commit-barrier wiring; GPU/topology/affinity-aware allocation (left pluggable via future allocator plugins). + +- **Adjacent expectations**: depends on the existing plugin framework (`plugin.h`/`plugin.c`), the existing select-expression evaluator (`resreq.h`, memoized via `select_eval_ctx_t`), and existing shared-resource tracking (`xce_scheduler_t.sharedInst`/`sharedInUse`) -- none of these change. Depends on scheduler-core for the core event interface that pushes worker and resource state; the iterators are independently unit-testable with constructed state. `ha-consistency-invariants`' commit barrier is a future consumer of scheduling decisions; this spec does not wire it. + +## Allocation Architecture (Reqs 2-4) + +Requirements 2, 3, and 4 form a three-layer allocation architecture. These layers compose according to the job's resource request type (PRIMARY, COMPOUND, or ALTER): + +### Resreq Type Hierarchy + +``` +ALTER -> OR-of-compounds: first compound that fully allocates wins + └─ COMPOUND -> AND-of-primaries: ALL primaries must allocate for success + └─ PRIMARY -> plan_iter -> host_iter -> try_alloc (leaf level) +``` + +The iterator composition (`xce_alloc_plan_iter_t` + `xce_host_iter_t`) operates at the **PRIMARY leaf**. COMPOUND and ALTER are composition rules above the iterators -- they call into the same primary allocator, unchanged from today's `sched_make_compound_allocation()` and `sched_make_alter_allocation()` dispatch. + +### Iterator Composition (PRIMARY leaf) + +``` + ┌──────────────────────────┐ + │ xce_alloc_plan_iter_t │ Req 2 + │ │ + │ init(primary_resreq, sched) │ + │ next() -> plan │ generates (nhosts, slots_per_host) + │ fini() │ candidates, most-preferred first + └────────────┬───────────────┘ + │ plan + ▼ + ┌──────────────────────────┐ + │ xce_host_iter_t │ Req 3 + │ │ + │ init(plan, workers) │ for a given plan, iterate + │ next() -> worker │ candidate hosts matching + │ fini() │ select expression + availability + └────────────┬───────────────┘ + │ worker + ▼ + ┌──────────────────────────┐ + │ try_alloc(worker, plan) │ Req 4 (parjob) or + │ │ existing seqjob logic + │ check slots, shared res, │ + │ commit or advance │ + └────────────────────────────┘ +``` + +### Composition Algorithm (All Three Types) + +```c +// === PRIMARY leaf: iterator composition === +// Returns >0 on success, 0 on failure +int allocate_primary(sched, primary_resreq, ctx) { + plan_iter = plan_iter_init(primary_resreq, sched); + while ((plan = plan_iter->next(plan_iter)) != NULL) { + host_iter = host_iter_init(plan, sched->workers); + while ((worker = host_iter->next(host_iter)) != NULL) { + if (try_alloc_on_host(worker, plan, ctx) > 0) { + host_iter->fini(host_iter); + plan_iter->fini(plan_iter); + return ALLOC_SUCCESS; + } + } + host_iter->fini(host_iter); + } + plan_iter->fini(plan_iter); + return ALLOC_FAIL; +} + +// === COMPOUND: AND of primaries === +// ALL primaries must allocate. On any failure, roll back prior allocations +// and return failure. Same logic as today's sched_make_compound_allocation(). +int allocate_compound(sched, compound_resreq, ctx) { + for (int i = 0; i < compound_resreq->primaries.count; i++) { + primary = compound_resreq->primaries[i]; + if (allocate_primary(sched, primary, ctx) <= 0) { + // Roll back all primaries allocated so far in this compound + rollback_compound_allocations(ctx, i); + return ALLOC_FAIL; + } + } + return ALLOC_SUCCESS; +} + +// === ALTER: OR of compounds === +// First compound that fully allocates wins. Same logic as today's +// sched_make_alter_allocation(). On failure, no rollback needed +// (prior compounds were never committed -- they failed their own checks). +int allocate_alter(sched, alter_resreq, ctx) { + for (int i = 0; i < alter_resreq->compounds.count; i++) { + compound = alter_resreq->compounds[i]; + if (allocate_compound(sched, compound, ctx) > 0) { + return ALLOC_SUCCESS; + } + // This compound failed -- advance to next alternative + } + return ALLOC_FAIL; +} + +// === Top-level dispatch === +// Unchanged from today's sched_make_allocation() dispatch on obj->tag. +int allocate_job(sched, job, ctx) { + switch (job->resreq_type) { + case PRIMARY: + return allocate_primary(sched, job->primary_resreq, ctx); + case COMPOUND: + return allocate_compound(sched, job->compound_resreq, ctx); + case ALTER: + return allocate_alter(sched, job->alter_resreq, ctx); + } +} +``` + +**COMPOUND rollback note:** If primaries 1 and 2 of a compound allocate but primary 3 fails, primaries 1 and 2 must be rolled back -- the compound is atomic. Today this is handled by `sched_make_compound_allocation()` tracking allocations in `ctx` and cleaning up on failure. This behavior is unchanged; the iterator interfaces don't alter the rollback contract. + +### Who Uses This Composition + +| Allocator | `maxTasks` | Plan iterator | Host iterator | Behavior | +|-----------|------------|---------------|---------------|----------| +| `seqjob_allocator` | `== 1` | Trivial: single plan (1 host x 1 slot) | Full: filters hosts by select expression | Unchanged from today -- first matching host wins | +| `parjob_allocator` | `> 1` | Full combinatorial: 1host x N, 2hosts x ceil(N/2), ..., Nhosts x 1 | Full: filters hosts with enough available slots | New -- walks plans until one succeeds | +| Future allocators | any | Custom strategy (e.g., topology-aware, bin-packing) | Reuses same `xce_host_iter_t` | Pluggable via `job_alloc_fn` | + +### Key Design Properties + +- **Lazy**: `plan_iter->next()` generates one plan at a time. `host_iter->next()` returns one host at a time. No full materialization. +- **Cancel-safe**: both `next()` calls have `pthread_cancel` cancellation points. +- **Independent lifecycles**: a `host_iter` is created from a plan, used, and destroyed; the `plan_iter` is advanced to the next plan only after the `host_iter` is done. `fini()` on one does not affect the other. +- **COMPOUND/ALTER unchanged**: the composition rules above the PRIMARY leaf (AND for compound, OR for alter) are unchanged from today. The iterator interfaces only change what happens inside `allocate_primary()`. +- **Seqjob rewrap**: `seqjob_allocator` is rewrapped onto the iterator interfaces as a trivial case -- its plan iterator always returns the single plan (1 host x 1 slot), and the inner loop is identical to today's first-match logic. This validates the abstraction before applying it to the complex parjob case. +- **Pluggable plan generation, shared host iteration**: plan generation is allocator-specific — each `job_alloc_fn` brings its own strategy (trivial, combinatorial, topology-aware, bin-packing) and creates its own `xce_alloc_plan_iter_t` internally. Host iteration is shared infrastructure — `xce_host_iter_t` has one implementation reused by all allocators, parameterized by sort order (`HOST_ORDER_ANY`, `HOST_ORDER_MOST_FREE`, etc.). Swapping allocation strategy = swapping the plugin; no core loop change. + +## Requirements + +### Requirement 2: Lazy allocation plan iterator + +**Objective:** As a maintainer of the scheduler's allocator plugins, I want a reusable lazy plan-generation abstraction, so that every allocator (current and future) can propose alternative host/slot combinations without materializing the full combinatorial space up front. + +#### Acceptance Criteria + +1. The Scheduler shall define an `xce_alloc_plan_iter_t` interface with `init(resreq, sched)`, `next() -> plan`, and `fini()` operations. The `init()` signature passes the full `xce_primary_resreq_t` (including `span`, `same`, `affinity`) and scheduler state — sufficient for any allocator to derive its plan space without future interface changes. + + **Plan-shaping fields** (on `xce_primary_resreq_t`, consumed by plan iterator internally): + - `span`: bounds host count (`nhosts_min`/`nhosts_max`) and per-host task cap (`max_per_host`, analogous to LSF `ptile`). v1 combinatorial generation ignores these (empty structs); fill when ptile/nhosts support is needed. + - `same`: co-location constraints ("all tasks on same rack"). v1 ignores; future. + - `affinity`: restrict to named host group. v1 ignores; future. + - `minTasks`/`maxTasks`: task count bounds — the primary driver of plan space. Used in v1. + - `select`: host filter expression — consumed by host iterator (Req 3), not plan iterator. + - `rusages`: resource requests — consumed by `try_alloc_on_host`, not plan iterator. + + v1 implements simple combinatorial generation: `1host×N, 2hosts×ceil(N/2), ..., Nhosts×1`. Future allocators read `span`/`same`/`affinity` to constrain the plan space without touching the `init()` signature. + +2. Each call to `next()` shall generate exactly one candidate `(nhosts, slots_per_host, host_filter)` plan without generating or materializing any other plan in the same call. + +3. The Scheduler shall order plans returned by successive `next()` calls from most-preferred to least-preferred, per the owning allocator's preference policy. + +4. `next()` shall return an end-of-iteration signal (not a plan) once every candidate plan has been produced, and this signal shall be stable across repeated calls after exhaustion. + +5. Calling `fini()` shall release all resources held by the iterator, and the interface shall define no other required cleanup step. + +### Requirement 3: Lazy host candidate iterator + +**Objective:** As a maintainer of the scheduler's allocator plugins, I want a reusable lazy host-candidate abstraction per allocation plan, so that host filtering reuses the existing select-expression evaluator instead of each allocator reimplementing worker collection and filtering. + +#### Acceptance Criteria + +1. The Scheduler shall define an `xce_host_iter_t` interface with `init(plan, workers)`, `next() -> worker`, and `fini()` operations. + +2. Each call to `next()` shall return the next candidate host satisfying the given plan's host filter (select expression plus resource availability), evaluated against the existing select-expression evaluator without changes to that evaluator. + +3. `next()` shall return NULL once no further candidate host exists for the current plan, and the caller shall not need to call `next()` again after receiving NULL for that plan. + +4. The host iterator shall compose with the plan iterator: a new `xce_host_iter_t` shall be constructible from any plan produced by Requirement 2's `xce_alloc_plan_iter_t.next()`. + +5. Calling `fini()` shall release all resources held by the host iterator, independent of the plan iterator's lifecycle. + +### Requirement 4: Parallel job combinatorial allocation + +**Objective:** As a cluster operator submitting a job that needs multiple task slots, I want `parjob_allocator` to actually allocate across hosts, so that jobs with `maxTasks > 1` are no longer silently unallocatable. + +#### Acceptance Criteria + +1. When a job's `xce_primary_resreq_t.maxTasks > 1` reaches `parjob_allocator`'s `job_alloc_fn` (`my_alloc()` in `parjob_allocator.c`), the Scheduler shall generate candidate plans covering at minimum the sequence 1 host x N slots, 2 hosts x ceil(N/2) slots, ..., N hosts x 1 slot, using Requirement 2's plan iterator. + +2. For each candidate plan, the Scheduler shall use Requirement 3's host iterator to collect hosts with enough available slots to satisfy that plan, and shall attempt allocation before advancing to the next plan. + +3. When a plan's host collection satisfies the plan's slot requirement, the Scheduler shall commit that allocation and shall not evaluate any remaining plan for that job. + +4. When no plan among those generated in Criterion 1 can be satisfied, `my_alloc()` shall return the same not-satisfied signal (`0`) that the current stub returns today, so pend-reason handling in `sched_make_primary_alloc_()` is unaffected. + +5. `parjob_allocator`'s `job_alloc_fn` shall no longer unconditionally `return 0` regardless of `ctx` contents -- the current stub behavior -- for any job with `maxTasks > 1`. + +### Requirement 7: Session-level unsatisfiable resreq cache + +**Objective:** As a maintainer of scheduling-loop performance, I want jobs with a resreq the current session already proved unsatisfiable to skip allocation immediately, so that a batch of similarly-shaped unsatisfiable jobs doesn't each re-pay full plan/host iteration cost. + +#### Acceptance Criteria + +1. The Scheduler shall maintain a per-session unsatisfiable-resreq fingerprint cache on `xce_scheduler_t`, keyed by `xce_cache_key_t` — a value type composing `xce_resreq_fingerprint_t` (pre-computed `{minTasks, maxTasks, select_node_id, rusage_hash}`) and identity (`{user, queue, project}` as xstring pointers). The resreq fingerprint is stored on the scheduling object (`xce_primary_schedobj_t`) and computed once on job ingest. The full cache key is constructed on the stack at lookup time — a single `kvtab_lookup()` with `cache_key_hash()` and `cache_key_eq()`. Fully O(1): no list walks, no string traversals, no allocations. This captures everything the allocator and limit plugin consume. + +2. The Scheduler shall clear the unsatisfiable-resreq cache at the start of every scheduling session (`begin_session`). + +3. When a job's primary resreq's plan iterator (Requirement 2) is exhausted without a successful allocation, the Scheduler shall populate the cache with that resreq's fingerprint before pending the job. In v1, cache population is preemption-agnostic: it fires on allocation failure alone. When the scheduler-preemption spec ships, preemption fires between allocation failure and cache population — if preemption succeeds, no cache entry is created; if preemption fails or is inapplicable, the cache entry is populated as normal. The allocation layer does not call into preemption; the caller (scheduling loop) orchestrates the sequence. + +4. Before starting full allocation for a job, the Scheduler shall look up the job's resreq fingerprint in the cache; on a hit, it shall pend the job immediately without invoking the plan or host iterators or preemption. + +5. A cache hit shall attribute the same pend reason category as the original unsatisfiable determination, so operators are not misled about why a later job was skipped. + +### Requirement 9: No regression to existing allocators or HA soak + +**Objective:** As a maintainer, I want the iterator-driven rework scoped so that existing single-slot allocation and COMPOUND/ALTER dispatch are unaffected, so that this framework change is safe to ship independently of any new allocator. + +#### Acceptance Criteria + +1. **Seqjob regression**: `seqjob_allocator`'s externally observable allocation behavior (which host a `maxTasks == 1` job lands on, given the same worker/resource state) shall be unchanged after it is rewrapped onto the `xce_host_iter_t` interface. + +2. **COMPOUND/ALTER unchanged**: The `COMPOUND` and `ALTER` resreq allocation paths (`sched_make_compound_allocation`, `sched_make_alter_allocation` in `scheduler.c`) shall remain unchanged, continuing to call into the per-primary allocation path (now iterator-driven) exactly as they do today. + +3. **Unit tests**: Existing scheduler unit tests (`scheduler` meson test suite) shall continue to pass unmodified in assertions, adjusted only where they directly exercised the eager-one-shot behavior or stub return value this feature replaces. + +4. **HA soak**: A full HA soak (sequential and chaotic `/xce-test-ha` regression) shall show no new job loss, divergence, or liveness stall attributable to this feature, confirming the scheduler-side change does not perturb controller-side commit/replication behavior it reads state from. + +## Data Structure Changes Summary + +### `xce_alloc_plan_iter_t` (new, Req 2) + +```c +typedef struct xce_alloc_plan_iter_s xce_alloc_plan_iter_t; + +struct xce_alloc_plan_iter_s { + // Initialize the iterator for a given primary resreq and scheduler state. + // Returns 0 on success, nonzero on error. + int (*init)(xce_alloc_plan_iter_t* iter, xce_primary_resreq_t* resreq, + xce_scheduler_t* sched); + + // Return the next candidate plan, or NULL when exhausted. + // The returned plan pointer is valid until the next next() or fini() call. + xce_alloc_plan_t* (*next)(xce_alloc_plan_iter_t* iter); + + // Release all resources held by the iterator. + void (*fini)(xce_alloc_plan_iter_t* iter); + + // Private state: current position, strategy-specific data + void* private; +}; + +// A plan describes how many hosts and slots to attempt +typedef struct { + int nhosts; // number of hosts needed + int slots_per_host; // slots required on each host + // host_filter: derived from primary_resreq->select, plus slot availability +} xce_alloc_plan_t; +``` + +### `xce_host_iter_t` (new, Req 3) + +```c +typedef struct xce_host_iter_s xce_host_iter_t; + +struct xce_host_iter_s { + // Initialize the iterator for a given plan and worker set. + // Returns 0 on success, nonzero on error. + int (*init)(xce_host_iter_t* iter, xce_alloc_plan_t* plan, + var workers); + + // Return the next candidate worker matching the plan's host filter, + // or NULL when exhausted. The returned worker pointer is valid until + // the next next() or fini() call. + xce_worker_t* (*next)(xce_host_iter_t* iter); + + // Release all resources held by the iterator. + void (*fini)(xce_host_iter_t* iter); + + // Private state: current position, filtering state + void* private; +}; +``` + +### New types (Req 7) + +```c +// Resreq portion of the cache key — pre-computed, shareable across jobs +// with identical resreqs. Fits in a single cache line (24 bytes). +typedef struct { + int min_tasks; + int max_tasks; + uint32_t select_node_id; // CSE-interned root; 0 if select is NULL + uint64_t rusage_hash; // computed at parse time, stable for life of resreq +} xce_resreq_fingerprint_t; + +// Full cache key — resreq fingerprint + identity. +// Identity fields are xstring pointers (not owned, not freed). +// Pointer equality = content equality for xstring-interned strings. +typedef struct { + xce_resreq_fingerprint_t resreq; + const char* user; // xstring pointer + const char* queue; // xstring pointer + const char* project; // xstring pointer +} xce_cache_key_t; + +// Hash — single call site, no ad-hoc field assembly +static inline uint64_t cache_key_hash(const xce_cache_key_t* k) { + uint64_t h = FNV64_INIT; + hash_update(&h, &k->resreq, sizeof(k->resreq)); + hash_update_ptr(&h, k->user); + hash_update_ptr(&h, k->queue); + hash_update_ptr(&h, k->project); + return h; +} + +// Equality — memcmp on fixed-size resreq portion + pointer equality on identity +static inline bool cache_key_eq(const xce_cache_key_t* a, const xce_cache_key_t* b) { + return memcmp(&a->resreq, &b->resreq, sizeof(a->resreq)) == 0 + && a->user == b->user + && a->queue == b->queue + && a->project == b->project; +} +``` + +### `xce_primary_resreq_t` addition (Req 7) + +One new field, set once at parse time: + +```c +// In xce_primary_resreq_t (resreq.h): +uint64_t rusage_hash; // set by parse_resreq_primary(), stable for life of resreq +``` + +### `xce_sched_obj_t` / `xce_primary_schedobj_t` addition (Req 7) + +Store the resreq portion of the fingerprint on the scheduling object so it is computed once and reused for every cache lookup of that job: + +```c +// On xce_primary_schedobj_t (or xce_sched_obj_t): +xce_resreq_fingerprint_t resreq_fp; // populated on job ingest, read by cache lookup +``` + +### Lookup site (pseudocode) + +```c +// Before allocation: construct key on stack, single hash + lookup +xce_cache_key_t key = { + .resreq = obj->u.primary->resreq_fp, + .user = obj->user, + .queue = obj->queue, + .project = obj->project, +}; +if (kvtab_lookup(sched->unsatisfiable_cache, &key, cache_key_hash, cache_key_eq)) { + pend_job(obj, original_reason); + return; +} +``` + +### Key design decisions + +- **struct-based**: hash and equality live next to the type. Single call site, no scattered field assembly. +- **`memcmp` on resreq portion**: all fields are fixed-size integers/IDs — no pointers, no deep compare. +- **pointer equality on identity**: xstring guarantees identical content → identical pointer. +- **select via `node_id`**: CSE intern table deduplicates identical select expressions. O(1). +- **rusages via pre-computed hash**: set once at parse time, stable for life of resreq. O(1). +- **span/same/affinity deferred**: currently empty structs; add to `xce_resreq_fingerprint_t` when they gain fields. + +### `xce_sched_ctx_t` addition (allocation mode) + +A mode field that controls which resource pool the allocator draws from. Defaults to `XCE_ALLOC_NORMAL`. Consumed by `try_alloc_on_host()` and any resource-availability check — applies to all resource types (slots, shared resources, limit instances, licenses, etc.), not just CPU slots. + +```c +// In xce_sched_ctx_t (sched/types.h): +typedef enum { + XCE_ALLOC_NORMAL = 0, // only truly free resources + XCE_ALLOC_PREEMPT, // count preemptible job resources as available + // Future: + // XCE_ALLOC_RESERVE, // count reserved-but-idle resources as available + // XCE_ALLOC_BACKFILL, // count reserved + preemptible resources +} xce_alloc_mode_t; + +xce_alloc_mode_t alloc_mode; // XCE_ALLOC_NORMAL by default +``` + +When `alloc_mode != XCE_ALLOC_NORMAL`, resource-availability checks count the full resource footprint of victim-candidate jobs (not just slots) as borrowable. The allocator logic is otherwise identical — no fork in `try_alloc_on_host()`. + +### `xce_preempt_victim_iter_t` (new, scheduler-preemption spec) + +Same lazy-iterator pattern as plan iterator, applied to victim selection: + +```c +typedef struct xce_preempt_victim_iter_s xce_preempt_victim_iter_t; + +struct xce_preempt_victim_iter_s { + int (*init)(xce_preempt_victim_iter_t*, xce_sched_job_t* job, xce_scheduler_t*); + xce_preempt_victim_set_t* (*next)(xce_preempt_victim_iter_t*); + void (*fini)(xce_preempt_victim_iter_t*); + void* private; +}; +``` + +The default policy (`lowest_priority_first`) generates victim sets lazily: smallest sufficient set of lowest-priority running jobs from `preemptible_queues` that would free enough resources. Listed here because the preemption flow wraps `allocate_primary()` and consumes `xce_alloc_mode_t` — both defined in this spec. + +### `parjob_allocator` changes (Req 4) + +- `my_alloc()` is replaced from a stub (`return 0`) to a real implementation that creates a plan iterator, walks candidate plans, and commits on first success. +- The allocator's registration in the plugin framework is unchanged -- only the `job_alloc_fn` implementation changes. + +### `seqjob_allocator` changes (Req 9 AC 1) + +- Internal rewrap: `my_alloc()` is restructured to use the plan and host iterator interfaces internally as a trivial case (1 host x 1 slot plan, then host iteration matching today's `sched_collect_workers()` + `xlist_find()` logic). +- Externally observable behavior is unchanged -- same host selection given same state. + +## Architecture Diagram + +### Allocation Flow (PRIMARY leaf) + +``` +┌──────────────────────────────────────────────────────────┐ +│ ALLOCATE PRIMARY (Req 2+3+4) │ +│ │ +│ plan_iter_init(primary_resreq) │ +│ │ │ +│ ▼ │ +│ ┌──────────────────────┐ │ +│ │ plan_iter->next() │ ←─ generates (nhosts, │ +│ │ returns plan or NULL │ slots_per_host) candidates │ +│ └──────────┬───────────┘ most-preferred first │ +│ │ │ +│ plan │ NULL (exhausted) │ +│ ▼ ▼ │ +│ ┌──────────────────┐ return ALLOC_FAIL │ +│ │ host_iter_init() │ │ +│ └────────┬─────────┘ │ +│ │ │ +│ ▼ │ +│ ┌──────────────────────┐ │ +│ │ host_iter->next() │ ←─ filters workers by │ +│ │ returns worker or NULL│ select expression + │ +│ └──────────┬───────────┘ slot availability │ +│ │ │ +│ worker │ NULL (no host for plan) │ +│ ▼ ▼ │ +│ ┌──────────────────┐ host_iter->fini() │ +│ │ try_alloc(worker, │ plan_iter->next() (next plan) │ +│ │ plan, ctx) │ │ +│ └────────┬─────────┘ │ +│ │ │ +│ success │ fail │ +│ ▼ ▼ │ +│ ┌────────────┐ host_iter->next() (next worker for plan) │ +│ │ commit │ │ +│ │ return │ │ +│ │ ALLOC_SUCCESS│ │ +│ └────────────┘ │ +└──────────────────────────────────────────────────────────┘ +``` + +### Unsatisfiable Resreq Cache (Req 7) + +``` +┌──────────────────────────────────────────────────────────┐ +│ SESSION START (begin_session) │ +│ │ +│ Clear unsatisfiable resreq fingerprint cache │ +│ │ +│ For each job from picker: │ +│ │ │ +│ ▼ │ +│ ┌──────────────────────────────┐ │ +│ │ Lookup fingerprint in cache │ │ +│ │ key = hash(minTasks, │ │ +│ │ maxTasks, select_node_id, │ │ +│ │ rusage_hash, user, queue, │ │ +│ │ project) │ │ +│ └──────────┬───────────────────┘ │ +│ │ │ +│ hit │ miss │ +│ ▼ │ ▼ │ +│ ┌────────┐ │ ┌──────────────────┐ │ +│ │ PEND │ │ │ Run full │ │ +│ │ immedi- │ │ │ allocation │ │ +│ │ ately │ │ │ (Req 2+3+4) │ │ +│ └────────┘ │ └────────┬─────────┘ │ +│ │ │ │ +│ │ success │ fail (exhausted) │ +│ │ ▼ ▼ │ +│ │ ┌────────────┐ ┌──────────────────────┐ │ +│ │ │ DISPATCH │ │ Populate cache with │ │ +│ │ │ (no cache │ │ resreq fingerprint │ │ +│ │ │ entry) │ │ then PEND job │ │ +│ │ └────────────┘ └──────────────────────┘ │ +└──────────────────────────────────────────────────────────┘ +``` + +## Integration Note: Preemption Interaction + +Preemption (scheduler-preemption spec) fires when allocation fails for a preemptible job. It follows the same lazy-iterator pattern as allocation, applied to victim selection instead of host selection. + +### Preemption Iterator + +Same shape as plan iterator, different domain: + +```c +// Preemption victim iterator — lazy generation of victim sets +typedef struct xce_preempt_victim_iter_s xce_preempt_victim_iter_t; + +struct xce_preempt_victim_iter_s { + int (*init)(xce_preempt_victim_iter_t* iter, xce_sched_job_t* job, + xce_scheduler_t* sched); + xce_preempt_victim_set_t* (*next)(xce_preempt_victim_iter_t* iter); + void (*fini)(xce_preempt_victim_iter_t* iter); + void* private; +}; +``` + +The default policy (`lowest_priority_first`) generates victim sets in order: smallest sufficient set of lowest-priority running jobs from `preemptible_queues` that would free enough resources for the preempting job. + +### Allocation Mode + +A `xce_alloc_mode_t` enum on `xce_sched_ctx_t` controls which resource pool the allocator draws from — applies to all resource types (slots, shared resources, limit instances, licenses), not just CPU slots: + +```c +typedef enum { + XCE_ALLOC_NORMAL = 0, // only truly free resources + XCE_ALLOC_PREEMPT, // count preemptible job resources as available +} xce_alloc_mode_t; +``` + +When `alloc_mode != XCE_ALLOC_NORMAL`, resource-availability checks count the full resource footprint of victim-candidate jobs as borrowable. The allocator logic is otherwise identical — no fork in `try_alloc_on_host()`. + +### Full Preemption Flow + +```c +int allocate_job(sched, job) { + // 1. Cache check + if (cache_lookup(job)) return pend(job); + + // 2. Normal allocation + if (allocate_primary(sched, job->resreq, ctx) > 0) return dispatch(job); + + // 3. Preemption (if applicable) + if (job->queue->preemptible_queues == NULL) { + cache_insert(job); + return pend(job); + } + + victim_iter_init(&viter, job, sched); + while ((victims = viter.next(&viter)) != NULL) { + ctx.alloc_mode = XCE_ALLOC_PREEMPT; + if (allocate_primary(sched, job->resreq, &ctx) > 0) { + viter.fini(&viter); + return commit_preempt(victims, job); + } + ctx.alloc_mode = XCE_ALLOC_NORMAL; + } + viter.fini(&viter); + + cache_insert(job); + return pend(job); +} +``` + +Key properties: +- v1 cache is preemption-agnostic (populated on allocation failure alone). +- When preemption ships, it fires between allocation failure and cache population. +- If preemption succeeds → no cache entry, preempting job is re-pended for next round. +- If preemption fails/exhausted → cache entry populated, job pended normally. +- Plan and host iterators are not preemption-aware — they simply report success/failure. +- `xce_alloc_mode_t alloc_mode` is the only new allocator surface needed. + +## Implementation Order + +Scheduler sub-specs are designed for sequential delivery: + +``` +Phase 1: scheduler-allocation (this spec) + ├── plan_iter + host_iter foundation iterators + ├── seqjob rewrap validates abstraction on simple case + ├── parjob combinatorial real parallel allocation + └── resreq cache performance optimization + +Phase 2: scheduler-core + ├── core/driver split extracts xce_sched_core_t from xce_scheduler_t + ├── picker interface xce_job_picker_iface_t + builtin_fcfs + └── session loop wires core_go() calls allocate_job() + +Phase 3: scheduler-preemption + ├── victim_iter lazy victim-set generator + ├── XCE_ALLOC_PREEMPT mode tells allocator to count borrowed resources + └── preempt_policy plugin lowest_priority_first default +``` + +| Phase | Why there | +|---|---| +| Allocation first | Self-contained. Unit-testable with fake workers. No core, no preemption needed. Iterators are the building block everything else sits on. | +| Core second | Wires allocation into a real scheduling loop. Picker feeds jobs → allocator places them → decisions flow. Without allocation, core has nothing to call. | +| Preemption last | Wraps allocation. Needs `allocate_primary()` to exist. Needs core session loop to re-pend preempted job. Is a "retry with borrowing" layer on top of normal allocation. | diff --git a/.kiro/specs/scheduler-allocation/spec.json b/.kiro/specs/scheduler-allocation/spec.json new file mode 100644 index 0000000..6bca5a8 --- /dev/null +++ b/.kiro/specs/scheduler-allocation/spec.json @@ -0,0 +1,26 @@ +{ + "feature_name": "scheduler-allocation", + "created_at": "2026-07-27T00:00:00Z", + "updated_at": "2026-07-27T00:00:00Z", + "language": "en", + "phase": "requirements-generated", + "parent_spec": "scheduler-framework", + "description": "Lazy iterator-driven allocation architecture with parallel job support and resreq caching for the XCE scheduler", + "approvals": { + "requirements": { + "generated": true, + "approved": false + }, + "design": { + "generated": false, + "approved": false + }, + "tasks": { + "generated": false, + "approved": false + } + }, + "ready_for_implementation": false, + "blocked_on": ["scheduler-core"], + "sibling_specs": ["scheduler-core", "scheduler-preemption"] +} diff --git a/.kiro/specs/scheduler-core/brief.md b/.kiro/specs/scheduler-core/brief.md new file mode 100644 index 0000000..53f1452 --- /dev/null +++ b/.kiro/specs/scheduler-core/brief.md @@ -0,0 +1,168 @@ +# Brief: scheduler-core + +## Problem + +The XCE scheduler has a plugin architecture but critical foundational gaps: + +1. **Job selection policy is hardcoded** — `sched_job_picker()` in `scheduler.c:39` uses the literal string `"xce_sched_fcfs"`. The picker runs in a dedicated thread with `jbuf` cbuf communication. No way to swap policies without recompilation. + +2. **Monolithic scheduler tied to controller I/O** — `xce_scheduler_t` holds both scheduling state and controller API context (`apictx`, `cluster_cfg`). No way to replay recorded events for debugging or test scheduling policies without a live cluster. + +3. **No picker plugin interface** — the existing plugin framework has `job_elect_fn` and `job_alloc_fn`, but no defined contract for how the picker receives state-change events, manages sessions, or communicates decisions back. The FCFS picker is tightly coupled to the scheduler internals. + +4. **No project-level scheduling** — `xce_sched_project_t` is just `{ char* name }`. Projects have no resource ownership, quota, or scheduling policy. + +Operators need configurable scheduling policies, and developers need a way to debug/tune scheduling behavior without a live cluster. + +## Current State + +### What exists +- **Plugin framework** (`plugin.h`, `plugin.c`): `xce_sched_plugin_t` with 9 hooks + `job_elect_fn` / `job_alloc_fn` +- **FCFS job picker** (`fcfs.c`): dedicated `jobpicker` thread. Iterates queues by priority, jobs by (priority desc, queue_time asc). Communicates via `jbuf` cbuf. +- **Scheduling loop** (`scheduler.c`): pick job → allocate → pend or dispatch → next +- **Controller integration** (`handler.c`): receives capnp push/notify → enqueues `xce_sched_update_request_t` → `sched_update()` dequeues. Decisions published via `sched->apictx`. +- **Select expression memoization** (`select_eval_ctx_t`): per-session AST caching + +### What's missing +- Pluggable job picker with defined interface contract +- Configurable picker name (no recompilation) +- Core/driver separation: scheduling logic decoupled from controller I/O +- Simulation mode: replay recorded events, virtual clock, deterministic execution +- Runtime recording for debugging/tuning +- State snapshot/restore for replay efficiency + +## Desired Outcome + +### 1. Pluggable Job Picker + +The core scheduling loop calls `picker->next_job()` to get the next schedulable job, with zero knowledge of how jobs are selected. The picker runs synchronously in the core's scheduling thread — no dedicated picker thread, no `jbuf` cbuf. + +Picker plugin interface (`xce_job_picker_iface_t`): + +| Category | Hooks | Purpose | +|----------|-------|---------| +| Lifecycle | `init`, `fini` | Setup and teardown | +| State-change | `on_queue_update`, `on_job_push`, `on_job_state_change`, `on_job_update` | Called when events arrive | +| Session | `begin_session`, `next_job`, `end_session` | Scheduling round lifecycle | +| Post-allocation | `on_dispatch`, `on_pend` | After allocation attempt | +| Optional | `on_config`, `on_job_rusage` | Advanced pickers (NULL if unused) | + +### 2. Core/Driver Separation + +Scheduler core is a passive, event-driven engine with zero controller I/O dependencies. The driver connects it: + +| Mode | Driver | Input | Output | +|------|--------|-------|--------| +| Normal | Controller-connected | capnp push/notify → core events | Core decisions → controller | +| Simulation | Replay file | JSONL event file → core events | Core decisions → log | + +- **Mode-agnostic core**: no mode flag, no mode-specific code paths +- **Virtualized clock**: `xce_core_now(core)` with two-base + speed formula +- **Discrete event-driven virtual clock**: jumps to next event timestamp +- **Snapshot + delta replay**: load snapshot, replay delta events +- **Deterministic guarantee**: same initial state + same events = same decisions +- **Runtime recording control**: xceadmin `scheduler record start/stop` + +### 3. Single Builtin Picker + +`builtin_fcfs` internally implements queue-priority + FCFS job ordering — replicates today's behavior. +Per-queue picker overrides supported. + +### Queue vs Project — Roles + +| | Queue | Project | +|---|---|---| +| **Role** | Scheduling mechanism | Resource ownership | +| **Question** | HOW are jobs ordered? | WHO owns resources? | +| **Key attributes** | Priority, limits, time windows, per-queue picker override, preemption config | Quota, usage, hierarchy (future) | +| **Cardinality** | 1 job → 1 queue | 1 job → 1 project | + +## Approach + +**Event-Driven Core with Pluggable Picker + Dual-Mode Driver**: + +### Core scheduling loop + +```c +picker->begin_session(picker); +while ((job = picker->next_job(picker)) != NULL) { + if (try_allocate(job) > 0) { + picker->on_dispatch(picker, job->jobid); + on_decision(driver_ctx, DISPATCH, job); + } else if (can_preempt(job)) { + on_decision(driver_ctx, PREEMPT, job, victims); + picker->on_pend(picker, job->jobid); + } else { + on_decision(driver_ctx, PEND, job); + picker->on_pend(picker, job->jobid); + } +} +picker->end_session(picker); +``` + +Core knows nothing about project/queue/job ordering. `next_job()` hides all selection. + +### Clock virtualization + +```c +uint64_t xce_core_now(core) { + wall_ns = clock_gettime(CLOCK_MONOTONIC); + elapsed = wall_ns - core->real_clock_base; + return core->virtual_clock_base + (elapsed * speed_num) / speed_den; +} +``` + +Normal: bases=0, speed=1/1 → returns wall clock. Simulation discrete: speed=0/1 → frozen at event ts. + +### What stays unchanged +- Plugin framework hooks (config, queue, job, worker, state_change, commit, election, prepare_allocation, rusage) — preserved +- Allocation logic — unchanged (in scheduler-allocation sibling spec) +- Controller communication in driver — extended, not replaced + +### What's new +- `xce_job_picker_iface_t` — pluggable picker with full hook specification +- `xce_sched_core_t` / `xce_sched_driver_t` / `xce_sched_sim_driver_t` +- `xce_core_event_t` — typed event interface +- `xce_core_decision_cb_t` — decision callback +- JSONL replay format + snapshot/restore +- `xce_core_now()` — virtualized clock accessor +- `builtin_fcfs` — single builtin picker +- `job_pick_plugin` on scheduler + per-queue override +- xceadmin recording commands + +## Scope + +### In +- Pluggable job picker interface with full hook specification +- Single builtin picker (`builtin_fcfs`) +- Configurable picker plugin with per-queue override +- Core/driver separation: passive core, normal driver, simulation driver +- Virtualized clock (`xce_core_now()` with two-base + speed formula) +- Discrete event-driven virtual clock +- JSONL replay format (HEADER + SNAPSHOT + events + DECISIONS) +- State snapshot/restore +- Deterministic replay guarantee +- Runtime recording control via xceadmin commands +- Data structures: `xce_sched_core_t`, `xce_sched_driver_t`, `xce_sched_sim_driver_t`, `xce_core_event_t`, `xce_job_picker_iface_t` +- Unit tests: picker hook behavior, simulation replay, snapshot/restore, deterministic verification +- HA soak regression for picker changes + +### Out +- Allocation iterators and parjob allocator (→ scheduler-allocation) +- Preemption policy and SIGSTP pipeline (→ scheduler-preemption) +- New picker policies beyond builtin_fcfs +- Hierarchical project resource quotas (→ project-resource-ownership) +- Dead field on `xce_sched_job_t` + +## Sibling Specs +- **scheduler-allocation**: Iterator-driven allocation, parjob allocator, resreq cache +- **scheduler-preemption**: Preemption policy, victim selection, SIGSTP pipeline + +## Constraints +- **C (gnu17)** — no C++, no external libraries beyond existing +- **Cancel-safe** — `next_job()` has pthread_cancel cancellation points +- **Session isolation** — picker state reset on begin_session +- **Backward compatible** — existing FCFS behavior unchanged +- **Deterministic replay** — same state + events → same decisions +- **Mode-agnostic core** — no mode flag, no mode-specific code paths +- **No wall-clock time in core** — all time through xce_core_now() diff --git a/.kiro/specs/scheduler-core/requirements.md b/.kiro/specs/scheduler-core/requirements.md new file mode 100644 index 0000000..cbcf7c8 --- /dev/null +++ b/.kiro/specs/scheduler-core/requirements.md @@ -0,0 +1,1311 @@ +# Requirements Document + +## Introduction + +The XCE scheduler has a plugin architecture but critical foundational gaps. Job selection policy is hardcoded (`sched_job_picker()` sets `job_pick_plugin = "xce_sched_fcfs"` as a literal). The scheduler is tightly coupled to controller I/O (`apictx`, `cluster_cfg` embedded in `xce_scheduler_t`). There is no way to swap picking policies without recompilation, and no way to debug or tune scheduling behavior without a live cluster. + +This spec establishes one central design invariant and three architectural foundations to achieve it. + +**Central invariant — Normal↔Sim equivalence**: Given identical initial configuration and identical event sequences, the scheduler shall produce identical scheduling decisions regardless of whether it runs in production (normal mode, controller-connected, wall-clock time) or in simulation (replay file, virtual clock). Record a live run → replay it in simulation → the decisions match byte-for-byte. This is NOT a debugging convenience — it is the **validation contract** for the entire architecture. If normal and simulation diverge, the core/driver separation is broken. This invariant enables every simulation-mode use case: debugging is faithful, tuning is predictive, regression testing is trustworthy, and what-if analysis reflects real behavior. + +Three foundations deliver this invariant: + +**Pluggable job picker**: A `xce_job_picker_iface_t` — the picker thread calls `picker->next_job()` to get the next schedulable job and hands it to the allocator thread via cbuf, with zero knowledge of how jobs are selected. The default `builtin_fcfs` picker internally implements queue-priority ordering and FCFS job ordering, replicating today's behavior. Per-queue picker overrides are supported. The picker runs in a dedicated thread communicating with the allocator via cbuf (existing producer/consumer pattern preserved). + +**Core/driver separation**: The scheduler core is a passive, event-driven engine with zero controller I/O dependencies. A normal-mode driver connects it to a live controller; a simulation-mode driver replays recorded cluster events through a discrete event-driven virtual clock, enabling policy debugging, tuning, regression testing, and what-if analysis without a live cluster. + +**Core is mode-agnostic**: The core has no concept of which mode it runs in. It processes events identically whether the driver is in normal mode or simulation mode. There is no mode flag, no mode-specific code path, and the same init function is used for both modes. + +> Full discovery context is in `.kiro/specs/scheduler-core/brief.md`. Sibling specs: `scheduler-allocation`, `scheduler-preemption`. + +## Queue vs Project — Roles + +These are fundamentally different concerns: + +| | Queue | Project | +|---|---|---| +| **Role** | Scheduling mechanism | Resource ownership | +| **Question** | HOW are jobs ordered and constrained? | WHO owns resources and gets charged? | +| **Scope** | One hardware/scheduling profile | Cross-queue, cross-cluster | +| **Key attributes** | Priority, limits, time windows, per-queue picker override, preemption config | Quota, usage, hierarchy, members (future) | +| **Cardinality to job** | 1 job → 1 queue | 1 job → 1 project | +| **Cardinality to each other** | Many-to-many | Many-to-many | + +- **Queue** = submission channel with scheduling policy. Owns resource thresholds (RUNLIMIT, MAX_RUNNING), time windows, priority (for inter-queue ordering within the picker), per-queue picker override, and preemption config. +- **Project** = resource ownership boundary. Owns quota, consumption tracking, hierarchical nesting, and accounting. The picker plugin may use `queue->project_name` internally for project-scoped iteration (v2). + +## Boundary Context + + - **In scope**: Pluggable job picker interface (`xce_job_picker_iface_t` with `next_job()`) hiding all selection logic behind a single plugin; single builtin picker (`builtin_fcfs`) replicating today's behavior through the new interface; configurable picker plugin with per-queue override (`queue->job_pick_plugin`); **core/driver separation** with passive event-driven core interface, mode-agnostic core (no mode flag, no mode-specific code paths), normal-mode driver (controller-connected), simulation-mode driver as a **standalone investigation tool** (replay recorded events with discrete event-driven virtual clock, zero controller dependencies, self-contained `.replay` file — single capnp binary stream with header + snapshot + events + decisions + periodic checkpoints in one artifact, what-if editing via event file substitution, diff-based comparison of simulated vs recorded decisions via `--sim-output`), virtualized clock access (`xce_core_now()` with two-base + speed formula), runtime recording control via xceadmin commands, `.replay` capnp stream format, state snapshot/restore for replay efficiency, **interactive REPL** with single-step, breakpoints, state inspection, and snapshot capture via `--interactive`, and deterministic replay guarantee for debugging/tuning; **normal↔sim equivalence guarantee** (same config + same events → identical decisions regardless of mode, AC 7.1); `xceadmin scheduler dump ` for human-readable replay file inspection; documentation of picker plugin interface contract (hooks, cancel-safe, session-aware); unit tests for picker hook behavior, **event recording/replay, snapshot/restore, and deterministic replay**; HA soak regression for picker changes. + +- **Out of scope**: Allocation iterators and parjob allocator (→ `scheduler-allocation` spec); preemption policy and SIGSTP pipeline (→ `scheduler-preemption` spec); new job selection policies beyond the builtin FCFS picker — the pluggable picker interface enables them, but none ship in this spec beyond `builtin_fcfs`; hierarchical project resource quotas (deferred to `project-resource-ownership` spec — only `project_name` on queue and `xce_sched_project_t` scaffolding ship here); decision payload capnp schema for `DispatchDecision`/`PendDecision`/`PreemptDecision` (deferred to design phase — replay file format schema is in AC 20); distributed/cluster-mode simulation (v1 is single-scheduler replay only); visual inspection / UI tool for replay files (deferred — `xceadmin scheduler dump` provides human-readable output, `diff` of dumps is the primary comparison workflow for v1). + +- **Adjacent expectations**: Depends on the existing plugin framework (`plugin.h`/`plugin.c`), the existing select-expression evaluator (`resreq.h`, memoized via `select_eval_ctx_t`), and existing shared-resource tracking — none of these change. Sibling spec `scheduler-allocation` provides the `try_allocate()` function this spec's core loop calls. Sibling spec `scheduler-preemption` provides the `can_preempt()` check and preemption decision type. + +## Implementation Phases + +The spec is implemented in three sequential phases. Each phase ships independently, passes HA soak regression, and preserves existing scheduling behavior. Phases are ordered by dependency — earlier phases produce primitives that later phases consume. + +### Phase 1: Pluggable Picker (Requirements 1–4) + +**Scope**: Replace the hardcoded `"xce_sched_fcfs"` literal with a configurable `xce_job_picker_iface_t`. Implement `builtin_fcfs` as the default plugin, replicating today's FCFS behavior exactly through the new interface hooks. + +**Changes to existing code**: +- Add `xce_job_picker_iface_t` with lifecycle, state-change, session, and post-allocation hooks (Req 1) +- Implement `builtin_fcfs` plugin with private `ordq_t` state, all MUST hooks (Req 3) +- Replace `sched_job_picker()` hardcoded string with `plugin_register`/`key_find` lookup (Req 1 AC 7) +- Add `job_pick_plugin` to `xce_scheduler_t` and `xce_sched_queue_t` (Req 2) +- Add `xce_sched_project_t` scaffolding + `project_name` on queue (Req 2 AC 3) + +**What does NOT change**: +- Today's main loop (`sched_update` → `sched_begin_session` → `sched_go` → decision drain → `sched_end_session`) is untouched +- Today's threads (picker, allocator) and cbuf communication are untouched +- Today's controller integration (`scheduler_req_handler`, capnp) is untouched +- Today's build system, test suite structure is untouched + +**Verification**: HA soak — same job-picking order as today, same decisions, zero divergence. + +**Why first**: Phase 2's `core_push_events()` must call picker hooks (`on_queue_update`, `on_job_push`, `on_job_state_change`, `on_job_update`). Implementing the picker first means Phase 2 only moves existing hook call sites — same calls, different location. No dead wiring, no incomplete interfaces. + +### Phase 2: Core/Driver Separation (Requirement 5, ACs 1–8) + +**Scope**: Extract the scheduling core into a passive, mode-agnostic engine (`xce_sched_core_t`). Introduce the three-call driver↔core protocol (`core_push_events`, `core_go`, `on_decision`). Build the normal-mode driver that recreates today's controller-connected behavior. + +**Changes to existing code**: +- Extract `xce_sched_core_t` from `xce_scheduler_t` — all scheduling state, zero controller deps (AC 1) +- Implement `core_push_events()` — batch-push events, call picker hooks synchronously (AC 2, AC 4) +- Implement `core_go()` — non-blocking signal to picker thread via `cbuf_put(&wbuf)` (AC 6) +- Implement `on_decision()` callback — per-decision emission to driver (AC 6) +- Build normal-mode driver: capnp → core events → decisions → xcecli (AC 8) +- Replace today's `main.c` decision switch with driver callback + +**What does NOT change**: +- Picker interface and `builtin_fcfs` plugin (Phase 1 already done) +- Threading: picker → jbuf → allocator → decisions cbuf pattern preserved +- Controller integration: same capnp messages, same xcecli API, same behavior +- Simulation: not yet wired — core is mode-agnostic but no sim driver exists + +**Verification**: HA soak — same decisions as Phase 1, same controller interaction, zero regression. + +**Why second**: Core extraction needs the picker hooks to exist (Phase 1 done). Core extraction is a prerequisite for Phase 3 — simulation needs a mode-agnostic core that is already tested and passing HA soak in production. + +### Phase 3: Simulation Mode + Recording + Interactive REPL (Requirement 5, ACs 9–22) + +**Scope**: Add virtual clock (`xce_core_now()`), snapshot/restore (`save_snapshot`/`load_snapshot`), simulation driver (replay file → events → decisions → record file), interactive REPL (step, breakpoints, state inspection, snapshot capture), and runtime recording hooks in the normal-mode driver. + +**Changes to existing code**: +- Add clock virtualization atoms to core: `virtual_clock_base`, `real_clock_base`, `speed_num`, `speed_den` (AC 3) +- Implement `save_snapshot()` / `load_snapshot()` with picker rebuild from core state (AC 21) +- Build simulation driver: load HEADER+SNAPSHOT, replay events, emit decisions to `--sim-output` (AC 13, AC 19) +- Build interactive REPL: stdin/stdout command loop, breakpoint matching, state inspection queries (AC 22) +- Add recording state to normal driver: `scheduler record start/stop`, event writing, periodic snapshots (AC 10–11, AC 12) +- Add simulation CLI flags: `--sim`, `--sim-speed`, `--sim-verify`, `--sim-output`, `--interactive` / `-i` + +**What does NOT change**: +- Core is already mode-agnostic (Phase 2 done) — no `if (simulation)` branches added +- Picker is already clean (Phase 1 done) — no changes to picker interface +- Normal driver is already split (Phase 2 done) — recording hooks are boolean-gated, zero overhead when off +- Production scheduling behavior is identical — simulation is an opt-in mode + +**Verification**: HA soak (normal mode — no regression). **Normal↔sim equivalence** (AC 7.1): record a live run, replay in simulation, `diff <(xceadmin scheduler dump recorded.replay) <(xceadmin scheduler dump simulated.replay)` → decision content identical. **Deterministic replay** (AC 7): same `.replay` file twice → same output. **Recording**: file written correctly, simulation replays recorded file correctly. **Interactive REPL** (AC 22): `--interactive` mode steps, breaks, and completes to identical decisions as batch `--sim` mode. State inspection commands report accurate live state (verified against known-good snapshot dumps). + +**Why last**: Simulation needs Phase 1 (picker hooks exist) and Phase 2 (core is mode-agnostic, driver boundary is clean). It is the only phase that adds net-new capability rather than restructuring existing code — all risk is in Phase 1 and 2. By Phase 3, the new architecture has already been validated in production via HA soak. + +### Phase Dependency Graph + +``` +Phase 1: Pluggable Picker ──► Phase 2: Core/Driver Split ──► Phase 3: Simulation + (Req 1-4) (Req 5 AC 1-8) (Req 5 AC 9-22) + │ │ │ + │ No deps │ Needs picker hooks │ Needs mode-agnostic core + │ │ from Phase 1 │ + clean driver boundary + │ │ │ from Phase 2 + ▼ ▼ ▼ + HA soak pass HA soak pass HA soak pass +``` + +Each phase: TDD (red → green → refactor) → HA soak regression → merge. No phase gates on unfinished work from a later phase. Each phase ships value independently. + +## Requirements + +### Requirement 1: Pluggable job picker interface + +**Objective:** As a maintainer of the scheduler, I want the core scheduling loop to call a single `next_job()` plugin interface with no knowledge of how jobs are selected, so that picking strategies (FCFS, priority, fair-share, deadline, etc.) are truly pluggable and the core loop never changes regardless of the picking algorithm. + +#### Acceptance Criteria +1. The Scheduler core loop shall call `picker->next_job(picker)` to get the next schedulable job (or NULL if none ready), and shall not contain any logic about project iteration, queue iteration, or job ordering — those concerns are entirely encapsulated inside the picker plugin. + +2. The job picker plugin interface (`xce_job_picker_iface_t`) shall define these operations, organized by category: + + **Lifecycle hooks** (MUST): + + | Operation | Signature | Semantics | + |-----------|-----------|-----------| + | `init` | `int (*init)(void* picker, xce_sched_core_t* core)` | One-time setup, receives core reference for state queries | + | `fini` | `void (*fini)(void* picker)` | Teardown and cleanup of all picker-owned resources | + + **State-change hooks** (MUST — called by core when events arrive from driver): + + | Operation | Signature | Semantics | Triggered by | + |-----------|-----------|-----------|-------------| + | `on_queue_update` | `int (*on_queue_update)(void* picker, xce_sched_queue_t* queue)` | Add/update queue in picker's internal ordering | `QUEUE_UPDATE` event | + | `on_job_push` | `int (*on_job_push)(void* picker, xce_sched_job_t* job)` | Add new pending job to picker's candidate set | `JOBS_PUSH` event | + | `on_job_state_change` | `int (*on_job_state_change)(void* picker, xce_sched_job_t* job, uint32_t new_state)` | Remove job from candidates if no longer pending; re-add if returning to pending | `JOB_STATE_CHANGE` event | + | `on_job_update` | `int (*on_job_update)(void* picker, xce_sched_job_t* job)` | Reorder job in candidates if priority/queue changed | `JOB_UPDATE` event | + + **Session hooks** (MUST — called at round boundaries): + + | Operation | Signature | Semantics | + |-----------|-----------|-----------| + | `begin_session` | `int (*begin_session)(void* picker)` | Reset iteration cursor; called at start of each scheduling round | + | `next_job` | `xce_sched_job_t* (*next_job)(void* picker)` | Return next schedulable job per picker's ordering, or NULL when exhausted | + | `end_session` | `int (*end_session)(void* picker)` | End-of-round notification; called before core sleeps between rounds | + + **Post-allocation hooks** (MUST — called after allocation attempt): + + | Operation | Signature | Semantics | + |-----------|-----------|-----------| + | `on_dispatch` | `int (*on_dispatch)(void* picker, uint64_t jobid)` | Job was allocated; remove from candidates permanently | + | `on_pend` | `int (*on_pend)(void* picker, uint64_t jobid)` | Job was pended; keep for next round but may deprioritize | + + **Optional hooks** (MAY — NULL if not needed): + + | Operation | Signature | Semantics | When needed | + |-----------|-----------|-----------|------------| + | `on_config` | `int (*on_config)(void* picker, xce_conf4sched_t* config)` | Rebuild picker strategy from config | Config-driven pickers (deadline, fair-share weights) | + | `on_job_rusage` | `int (*on_job_rusage)(void* picker, xce_sched_job_t* job, xce_job_rusages_t* rusages)` | Track per-job resource usage | Resource-aware pickers (fair-share, backfill) | + + Hooks not defined on the picker interface (worker updates, resource updates, resval updates) are not forwarded to the picker — picking is about job ordering, not resource availability. + +3. **Threading model**: The core uses three threads communicating via cbuf (bounded FIFO with mutex + condition variables, `src/include/mylock.h`): + + | Thread | Role | cbuf In | cbuf Out | Blocked On | + |--------|------|---------|----------|------------| + | Picker | Iterates queues/jobs via `next_job()`, pushes jobids | `wbuf` (from core main) | `jbuf` (to allocator) | `cbuf_get(&wbuf)` between sessions | + | Allocator | Calls `try_allocate()`/`can_preempt()`, builds decisions | `jbuf` (from picker) | `decisions` (to driver) | `cbuf_get(&jbuf)` between jobs | + | Core Main (driver context) | Calls `core_push_events()`, signals `core_go()`, drains decisions | `decisions` (from allocator) | `wbuf` (to picker) | `cbuf_get(&decisions)` during session | + + **Driver → Core event delivery**: State-change hooks (`on_queue_update`, `on_job_push`, `on_job_state_change`, `on_job_update`) are called synchronously during `core_push_events()` in the driver thread, before the call returns. This is safe because `core_push_events()` is only called between sessions when the picker thread is idle (blocked on `cbuf_get(&wbuf)`) and the allocator thread is idle (blocked on `cbuf_get(&jbuf)`). No mid-session event injection. + + **Session hooks** (`begin_session`, `next_job`, `end_session`) run in the picker thread. **Post-allocation hooks** (`on_dispatch`, `on_pend`) run in the allocator thread. + +4. The core scheduling loop shall use a **producer/consumer pattern across three threads** communicating via cbuf: + + **Picker thread** (`fcfs_elect_job` equivalent): + ```c + while (1) { + int go = 0; + cbuf_get(&core->wbuf, &go); // block until core_go() signals + picker->begin_session(picker); + xce_sched_job_t* job; + while ((job = picker->next_job(picker)) != NULL) { + cbuf_put(&core->jbuf, &job->jobid); // hand off to allocator + } + uint64_t end_marker = 0; + cbuf_put(&core->jbuf, &end_marker); // end-of-session signal + picker->end_session(picker); + } + ``` + + **Allocator thread**: + ```c + while (1) { + uint64_t jobid = 0; + cbuf_get(&core->jbuf, &jobid); // block until picker sends job + if (jobid == 0) { + // end-of-session marker + cbuf_put(&core->decisions, NULL); + continue; + } + xce_sched_job_t* job = sched_get_job(core, jobid); + int rc = try_allocate(job); + if (rc > 0) { + picker->on_dispatch(picker, job->jobid); + decision = make_dispatch_decision(job->allocs); + } else if (can_preempt(job)) { + decision = make_preempt_decision(job, victims); + picker->on_pend(picker, job->jobid); + } else { + decision = make_pend_decision(job->reason); + picker->on_pend(picker, job->jobid); + } + cbuf_put(&core->decisions, &decision); + } + ``` + + **Main loop** (driver thread context — `core.go()`): + ```c + atomic_store(&core->session_active, 1, memory_order_release); + core_begin_session_internal(core); // select eval ctx, reset workers + cbuf_put(&core->wbuf, &go); // NON-BLOCKING: signal picker, return + // Driver then drains decisions cbuf: + while (1) { + cbuf_get(&core->decisions, &decision); + if (decision == NULL) break; // session exhausted + core->on_decision(core->driver_ctx, decision); // publish immediately + } + core_end_session_internal(core); // GC, reset workers + atomic_store(&core->session_active, 0, memory_order_release); + ``` + + The picker and allocator contain zero knowledge of project/queue/job ordering — all selection logic lives behind `next_job()`. The allocator contains zero knowledge of how the driver publishes decisions — it only calls `cbuf_put(&decisions, &decision)`. + +5. The picker plugin shall be cancel-safe: `next_job()` shall have defined `pthread_cancel` cancellation points. The picker shall be session-aware: `begin_session()` resets iteration state, `end_session()` is called before sleep-between-rounds. + +6. The hardcoded `"xce_sched_fcfs"` literal at `scheduler.c:43` (in `sched_job_picker()`) shall be replaced by loading the configured `sched->job_pick_plugin` via the existing `plugin_register`/`key_find` mechanism. If the configured plugin name is not registered, the Scheduler shall fail with a clear configuration error. + +7. The existing multi-threaded producer/consumer architecture (picker thread → `jbuf` cbuf → allocator thread → `decisions` cbuf → main loop) shall be preserved. The driver thread signals the picker thread via `wbuf` cbuf (non-blocking `cbuf_put`). The only thread eliminated is the conceptual one: today's FCFS picker is a dedicated thread, and it stays a dedicated thread — but the core scheduling loop in the driver is simplified because decision publishing moves from a hardcoded `main.c` switch to a driver-registered `on_decision` callback. + +### Requirement 2: Configurable picker plugin + +**Objective:** As a cluster operator, I want to configure which job-picking policy the scheduler uses without recompiling, and override it per-queue, so that FCFS, priority, or custom pickers can be swapped operationally. + +#### Acceptance Criteria +1. The Scheduler shall add a `job_pick_plugin` field to `xce_scheduler_t`, defaulting to `"builtin_fcfs"` when unset — this is the global picker plugin name. + +2. The Scheduler shall add a `job_pick_plugin` field to `xce_sched_queue_t`, defaulting to NULL (inherit from global). When non-NULL, the configured global picker plugin shall use this per-queue override for jobs within that queue. How the picker plugin uses per-queue overrides is an implementation detail of the plugin, not the core loop. + +3. The Scheduler shall add a `project_name` field to `xce_sched_queue_t`, set from queue configuration, establishing the queue→project relationship. The picker plugin may use this field internally for project-scoped iteration. + +4. The Scheduler shall accept the picker plugin name from scheduler configuration (or equivalent operator-facing settings), applied at scheduler startup without requiring a rebuild. + +5. When the configured plugin name is not registered via the existing `plugin_register`/`key_find` mechanism, the Scheduler shall fail with a clear configuration error rather than silently falling back to the builtin default. + +6. The picker plugin interface contract (`xce_job_picker_iface_t`) shall be documented: each picker must be cancel-safe (responds to `pthread_cancel` at defined points in `next_job()`) and session-aware (resets its iteration state on `begin_session()`). + +### Requirement 3: Builtin default picker + +**Objective:** As a maintainer, I want the new architecture to ship with a builtin picker plugin that replicates today's exact scheduling behavior, so that operators who don't configure a custom picker see no behavioral change. + +#### Acceptance Criteria + +1. **Registration**: `builtin_fcfs` shall be registered automatically at scheduler startup as `"builtin_fcfs"` and set as the default `sched->job_pick_plugin`. + +2. **Hook implementation** — `builtin_fcfs` shall implement every MUST and SHOULD hook from `xce_job_picker_iface_t` (Req 1 AC 2) as follows: + + | Hook | FCFS Implementation | + |------|-------------------| + | `init` | Allocate `fcfs_plugin_data_t`. Initialize `ordq_t queues` (ordered by `queue->priority desc`). Set iteration cursor to NULL. | + | `fini` | Free all per-queue `ordq_t pendJobs`, the `ordq_t queues`, and plugin data. | + | `on_queue_update` | Upsert queue into `ordq_t queues`. If queue exists, update its priority and reorder. If new, allocate `fcfs_queue_t` with empty `ordq_t pendJobs`. | + | `on_job_push` | If `job->state & JOB_STAT_PEND`: find the job's queue in `ordq_t queues`, add `fcfs_job_t{job}` to that queue's `ordq_t pendJobs` (ordered by `priority desc, queue_time asc`). | + | `on_job_state_change` | If `new_state` is not pending (EXIT/FAIL/DONE): remove job from its queue's `pendJobs` by jobid. If `new_state` returns to PEND: re-add to `pendJobs`. | + | `on_job_update` | If job's `priority` or `queue` field changed: remove from old position in `pendJobs`, re-insert at correct position per ordering. | + | `begin_session` | Reset iteration cursor to head of `ordq_t queues`. | + | `next_job` | Walk `ordq_t queues` from cursor. For each queue, skip if `sched_queue_is_ready()` returns false. Within queue, walk `ordq_t pendJobs`. Return first job where `sched_job_is_ready()` returns true. Advance cursor. Return NULL when all queues and jobs exhausted. | + | `end_session` | No-op for FCFS (iteration state reset in `begin_session`). | + | `on_dispatch` | Remove job from its queue's `ordq_t pendJobs` by jobid. | + | `on_pend` | No-op for FCFS — job remains in `pendJobs`, will be retried next round in same position. | + | `on_config` | NULL — FCFS is config-agnostic. | + | `on_job_rusage` | NULL — FCFS is not resource-aware. | + +3. **Internal data structures** — `builtin_fcfs` shall maintain its own private state, not query the core's `sched->queues`/`sched->jobs` during `next_job()`. All candidate management happens in the state-change hooks. This ensures: + - `next_job()` is fast — no core lock acquisition, no hash table scans + - The picker is independently testable — feed hooks, verify `next_job()` order + - Simulation snapshots capture picker state naturally via the hooks already recorded in the event stream + +4. **Ordering equivalence** — `builtin_fcfs` shall produce the same job-picking order as today's `fcfs_elect_job`: inter-queue by descending `queue->priority`, intra-queue by `priority desc, queue_time asc`. Behavior with per-queue picker overrides is as specified in Req 2 AC 2. + +5. **Dedicated picker thread retained** — `builtin_fcfs` shall implement `next_job()` as a synchronous call within the picker's dedicated thread. The picker thread communicates with the allocator thread via `jbuf` cbuf (existing pattern). `pthread_cancel` cancellation points shall exist in the `next_job()` iteration loop and in `cbuf_get(&wbuf)` where the picker blocks between sessions. + +6. **Session state** — `end_session()` is a no-op. Iteration state is reset in `begin_session()`. Undispatched jobs remain in `pendJobs` across sessions (they carry over to the next round). + +### Requirement 4: No regression to existing picker behavior or HA soak + +**Objective:** As a maintainer, I want the picker rework and core/driver separation scoped so that existing FCFS behavior is unaffected, making the framework change safe to ship independently of any new policy. + +#### Acceptance Criteria +1. `builtin_fcfs` shall produce the same job-picking order as today's `fcfs_elect_job`, given the same queue and job state — same inter-queue priority ordering and same intra-queue (priority desc, queue_time asc) ordering. +2. Existing scheduler unit tests (`scheduler` meson test suite) shall continue to pass unmodified in assertions, adjusted only where they directly exercised the removed hardcoded-string and the refactored `sched_go()` / decision publishing path this feature replaces. The picker thread, allocator thread, and cbuf communication pattern are preserved. +3. A full HA soak (sequential and chaotic `/xce-test-ha` regression) shall show no new job loss, divergence, or liveness stall attributable to this feature, confirming the scheduler-side change does not perturb controller-side commit/replication behavior it reads state from. + +### Requirement 5: Core/Driver Separation with Dual-Mode Operation + +**Objective:** As a scheduler developer, I want the scheduling core separated from all external I/O so that the same core logic runs deterministically in production (driven by a live controller) and in simulation (driven by recorded cluster events with a discrete event-driven virtual clock), enabling policy debugging, tuning, regression testing, and what-if analysis without a live cluster. + +#### Acceptance Criteria + +**Driver ↔ Core Protocol (overview)** + +The driver and core communicate through a three-call synchronous interface with cbuf-based internal threading. The driver buffers controller events externally between sessions, pushes them as a batch before each scheduling round, and receives decisions one-by-one as they are produced. + +| Direction | Call | Semantics | Thread | +|-----------|------|-----------|--------| +| Driver → Core | `core_push_events(core, events, n)` | Batch-push events before session. State-change hooks called synchronously. Only valid when picker is idle (between sessions). | Driver thread | +| Driver → Core | `core_go(core)` | Start scheduling session. **NON-BLOCKING** — signals picker thread via cbuf, returns immediately. Returns `-EINVAL` if session already active. | Driver thread | +| Core → Driver | `on_decision(ctx, decision)` | Each scheduling decision emitted immediately as produced. Called from allocator thread context. | Allocator thread | +| (implicit) | picker sends `jobid=0` through `jbuf` | End-of-session marker. Allocator forwards as `NULL` through `decisions` cbuf. | Picker → Allocator → Driver | + +**Event buffering discipline**: The driver accumulates controller events (capnp push/notify messages from the handler thread) into `pend_updates` (existing dataq swap mechanism). Between sessions, the driver drains `pend_updates` into `xce_core_event_t` array and calls `core_push_events()`. No events are injected mid-session — the picker thread is blocked on `cbuf_get(&wbuf)` and the allocator thread on `cbuf_get(&jbuf)`, so `core_push_events()` has exclusive access to picker state. + +**Decision publishing**: Each decision is published immediately to the controller (not batched at session end). The driver's `on_decision` callback calls `xcecli_jobdispatch()` / `xcecli_set_pend_reason()` / `xcecli_preempt()` synchronously. This matches today's `main.c:181-196` behavior. + +**Mode selection**: Mode is chosen at startup via CLI flags. The core has zero knowledge of which mode is active: + +```c +// main.c — mode selection (single branch) +if (arguments.sim_file) { + sched_sim_driver_run(&sim_driver, arguments); +} else { + sched_driver_run(&driver, &config, cluster_cfg, handler); +} +``` + +| Flag | Mode | Purpose | +|------|------|---------| +| (none) | Normal | Controller-connected (current behavior) | +| `--sim FILE` | Simulation | Replay `.replay` file | +| `--sim-speed N` | Simulation | 0=fast, 1=real-time, N=N× | +| `--sim-start-ts NS` | Simulation | Start replay from logical time | +| `--sim-verify` | Simulation | Compare decisions against recorded | +| `--interactive` / `-i` | Simulation | Open REPL for step-through debugging | +| `--sim-alt-events FILE` | Simulation | What-if branching | +| `--sim-output FILE` | Simulation | Write simulated decisions to `.replay` file | + +**Migration from old `job_elect_fn`**: The existing `xce_sched_plugin_t->job_elect_fn` (which `fcfs_elect_job` implements) is superseded by `xce_job_picker_iface_t->next_job()`. The old `job_elect_fn` shall be deprecated with a warning at plugin register time. The new `builtin_fcfs` picker implements the new interface exclusively. Existing plugins that only implement `job_elect_fn` continue to work via a compatibility wrapper during the transition period, but new pickers shall implement `xce_job_picker_iface_t`. + +--- + +**Core Interface Contract** + +1. **Mode-agnostic core**: The Scheduler core shall have no concept of which mode it runs in. It processes events identically whether the driver is in normal mode (controller-connected, wall-clock time) or simulation mode (replay file, virtual clock). Specifically: + - There shall be no mode flag (`bool simulation_mode` or equivalent) anywhere in the core + - There shall be no `if (simulation) { ... } else { ... }` code path in the core + - `xce_sched_core_init()` shall take identical parameters regardless of mode + - The core's decision callback shall be the same function pointer type in both modes + - The core's `save_snapshot()` and `load_snapshot()` shall be identical in both modes + +2. **Passive event-driven interface**: The core shall expose a pure event-driven interface — it receives typed events from the driver, updates internal scheduling state, and emits decisions through a driver-registered callback. The core shall have zero direct dependency on: controller communication, capnp serialization, network I/O, filesystem access, or wall-clock time sources. + +3. **Virtualized clock access**: The core shall access time exclusively through `xce_core_now()`. The core shall never call `time(NULL)`, `clock_gettime()`, `gettimeofday()`, or any other wall-clock time function directly. + + **Clock virtualization mechanism — two-base + speed formula:** + + The core stores four fields (atomically updated by the driver as a group): + + | Field | Type | Description | + |-------|------|-------------| + | `virtual_clock_base` | `_Atomic uint64_t` | Virtual-time anchor (nanoseconds) | + | `real_clock_base` | `_Atomic uint64_t` | Wall-clock anchor captured when `virtual_clock_base` was set (nanoseconds, `CLOCK_MONOTONIC`) | + | `speed_num` / `speed_den` | `_Atomic uint64_t` | Speed multiplier as rational fraction | + + `xce_core_now(core)` computes: + ```c + uint64_t wall_ns = clock_gettime(CLOCK_MONOTONIC); // only wall-clock call in the core + uint64_t elapsed = wall_ns - core->real_clock_base; + return core->virtual_clock_base + (elapsed * core->speed_num) / core->speed_den; + ``` + + | Mode | `virtual_clock_base` | `real_clock_base` | `speed` | Behavior | + |------|----------------------|-------------------|---------|----------| + | Normal | 0 | 0 | 1/1 | `xce_core_now()` = wall clock (degraded: `0 + (wall - 0) × 1`) | + | Simulation discrete | event `ts` | wall at load | 0/1 | `xce_core_now()` = frozen at event `ts` (time does not advance between events) | + | Simulation real-time | snapshot `ts` | wall at load | 1/1 | `xce_core_now()` tracks wall clock from virtual anchor | + | Simulation fast/slow | snapshot `ts` | wall at load | N/1 or 1/N | `xce_core_now()` runs N× faster or slower than wall clock | + + The driver atomically updates all four fields before each event dispatch. **Multi-thread safety**: `xce_core_now()` reads atomic fields lock-free. Both picker and allocator threads independently compute the same virtual time from the shared bases — no mutex needed. + + All internal time uses go through `xce_core_now()`: scheduling logic, logging (via tlog format function using `userptr`), error messages, debug traces. + Job `sub_time` and `queue_time` are set by the driver before pushing `JOBS_PUSH`. + + **Third-party library constraint**: any library linked into the core that needs time must obtain it through `xce_core_now()` or a core-provided wrapper. Specifically: + - **Logging (tlog)**: The core shall register its own format function via `tlog_reg_format_func(fn, core_ptr)` where `core_ptr` is the `xce_sched_core_t*`. This format function shall ignore `info->time` and instead read `xce_core_now(core_ptr)`, converting nanoseconds to `struct tm` fields via `gmtime_r()` (deterministic — pure computation). + - **libxce subset**: The core shall link only against the minimal data-structure subset of libxce (`ordq`, `dataq`, `cbuf`, `xlist`, `zarray`, `kvmgr`, `rtti`) — not against `netio`, `delay`, `xceapi`, or `idgen` which call wall-clock time internally. + - **pthread timed-blocking**: The core is multi-threaded. In simulation mode, thread interleaving is made deterministic — `pthread_cond_timedwait()` and `pthread_mutex_timedlock()` are not needed in the deterministic execution path. + - Libraries that cannot avoid calling wall-clock time directly must not be linked into the core; such concerns stay in the driver layer. + +4. **Core event types — detailed payload specification**: The core interface shall accept at minimum these input events. Each event carries a timestamp (`ts`, nanoseconds since epoch) and a type-specific payload. The field set below is normative for implementation; the exact capnp message schema is deferred to the design phase. + + **`CONFIG_PUSH`** — Full configuration push (scheduler startup or config reload): + | Field | Type | Description | + |-------|------|-------------| + | `config` | `xce_conf4sched_t*` | All queues, resource thresholds, preemption config, time windows, global policy settings | + | → Picker hook: `on_config(picker, config)` | | | + + **`JOBS_PUSH`** — Newly submitted jobs: + | Field | Type | Description | + |-------|------|-------------| + | `njobs` | `int` | Number of jobs in this batch | + | `jobs` | `xce_job_t*[njobs]` | Job records: jobid, user, project, queue, priority, state, queue_time, resreq | + | → Picker hook: `on_job_push(picker, job)` for each job | | | + + **`WORKERS_PUSH`** — Worker list update (nodes added/removed): + | Field | Type | Description | + |-------|------|-------------| + | `nworkers` | `int` | Number of workers in this update | + | `workers` | `xce_worker_t*[nworkers]` | Worker records: workerid, host, resources, state, assigned_jobs | + + **`RESOURCES_PUSH`** — Resource definitions (new resource types registered): + | Field | Type | Description | + |-------|------|-------------| + | `n` | `int` | Number of resource definitions | + | `resources` | `xce_resource_t*[n]` | Resource records: name, type, total, flags | + + **`RESVALS_FULL`** — Full resource value snapshot (periodic or after large change): + | Field | Type | Description | + |-------|------|-------------| + | `n` | `int` | Number of resource value entries | + | `resvals` | `xce_resval_t*[n]` | Each: workerid, resource_name, available, used, reserved | + + **`RESVALS_DELTA`** — Incremental resource value update (fine-grained changes): + | Field | Type | Description | + |-------|------|-------------| + | `deltas` | `xce_resval_list_t*` | Linked list of individual resval changes (add/subtract) | + + **`JOB_STATE_CHANGE`** — Job started, exited, or failed: + | Field | Type | Description | + |-------|------|-------------| + | `jobid` | `uint64_t` | Job identifier | + | `old_state` | `uint32_t` | Previous job state (for context) | + | `new_state` | `uint32_t` | New job state: RUNNING, EXIT, FAIL, DONE, PEND | + | `exit_code` | `int32_t` | Exit code (meaningful only for EXIT/FAIL) | + | → Picker hook: `on_job_state_change(picker, job, new_state)` | | | + + **`JOB_UPDATE`** — In-place job field modification (priority change, queue reassignment): + | Field | Type | Description | + |-------|------|-------------| + | `jobid` | `uint64_t` | Job identifier | + | `changed_fields` | `uint32_t` | Bitmask of fields that changed (JOB_F_PRIORITY, JOB_F_QUEUE, JOB_F_RESREQ) | + | `job` | `xce_job_t*` | Full job record with updated fields | + | → Picker hook: `on_job_update(picker, job)` | | | + + **`QUEUE_UPDATE`** — Queue definition added or modified: + | Field | Type | Description | + |-------|------|-------------| + | `queue` | `xce_queue_t*` | Queue record: name, priority, RUNLIMIT, MAX_RUNNING, state, time_window, job_pick_plugin, project_name | + | → Picker hook: `on_queue_update(picker, queue)` | | | + + **`JOB_RUSAGE`** — Job resource usage update (for resource-aware pickers): + | Field | Type | Description | + |-------|------|-------------| + | `jobid` | `uint64_t` | Job identifier | + | `rusages` | `xce_job_rusages_t*` | Resource usage metrics: cpu_time, mem_bytes, io_bytes | + | → Picker hook: `on_job_rusage(picker, job, rusages)` (optional — NULL if not registered) | | | + + **`BEGIN_ROUND`** — Trigger a scheduling round (session boundary, see AC 18): + | Field | Type | Description | + |-------|------|-------------| + | `timestamp_ns` | `uint64_t` | Logical time at which the round should execute | + + **`END_SESSION`** — Explicit end-of-recording marker (written to replay file, never sent to core): + | Field | Type | Description | + |-------|------|-------------| + | `timestamp_ns` | `uint64_t` | Logical time when recording stopped | + +5. **Decision output types**: The core shall emit decisions through the `on_decision` callback. Three decision types exist: + + | Decision Type | Fields | Driver Action | + |---------------|--------|---------------| + | `DISPATCH` | `jobid`, `workerid`, `allocations[]` (resource, amount per allocation) | `xcecli_jobdispatch()` | + | `PEND` | `jobid`, `reason` (code + message) | `xcecli_set_pend_reason()` | + | `PREEMPT` | `jobid`, `victims[]` (jobid, workerid per victim), `reason` | `xcecli_preempt()` | + + These are recorded as `ReplayDecision` messages within `ReplaySession.decisions`. The exact decision payload schema is deferred to the design phase. + +6. **Decision output callback**: The core shall emit all scheduling decisions (`DISPATCH`, `PEND`, `PREEMPT`) through a `xce_core_decision_cb_t` callback registered by the driver at init time. Signature: `int (*on_decision)(void* driver_ctx, xce_decision_t* decision)`. This replaces the current internal `decisions` cbuf poll loop in `main.c`. + +7. **Deterministic guarantee**: Given identical initial state and identical event sequences with identical timestamps, the core shall produce identical decision sequences. The core is multi-threaded (picker + allocator threads communicating via cbuf). Deterministic replay is achieved through: + - **cbuf capacity=1 serialization**: The `jbuf` cbuf between picker and allocator has capacity 1 (`cbuf_init(&jbuf, 1, sizeof(uint64_t))`). This acts as a rendezvous — the picker blocks on `cbuf_put` until the allocator takes the current jobid. Jobs flow through the pipeline one at a time in fully determined order. + - **Stabilized hash table iteration**: All hash table / key-value store iteration that affects scheduling output order shall be stabilized (sorted by key before iterating). + - **PRNG for tie-breaking**: Any required randomness (e.g., tie-breaking) shall use a PRNG seeded by the driver at init time (`core->prng_seed`). + - **Same events → same picker state**: Since `core_push_events()` is called between sessions (picker idle), the picker's internal data structures (`ordq_t queues`, `ordq_t pendJobs`) are populated identically given identical event sequences. The picker iteration then produces jobids in identical order. + + **7.1 Normal-mode ↔ simulation equivalence**: Given identical initial configuration (`xce_conf4sched_t`) and identical event sequences (same job submissions, state changes, resource updates at the same logical positions), the core shall produce identical decision sequences in both normal mode and simulation mode. Specifically: + + - Record a normal-mode scheduling session (AC 10) → produce `.replay` file R + - Run simulation on R (AC 13) → produce `.replay` file S + - `diff <(xceadmin scheduler dump R) <(xceadmin scheduler dump S)` → only non-decision metadata may differ (timestamps in `ReplayHeader`, wall-clock annotations in `SessionSummary`). Every `ReplayDecision` shall match identically: same jobid, same workerid, same allocation amounts, same pend reasons. + + This constraint is the **validation contract** for the entire core/driver architecture. If normal mode and simulation mode diverge, one of three things is broken: + - The core has a hidden dependency on wall-clock time or controller I/O (violates AC 1) + - The event recording is lossy — dropping events that matter to scheduling decisions (violates AC 10) + - The simulation driver's input translation from capnp or `.replay` format is not faithfully reproducing the normal-mode event stream + + This constraint turns recording + replay from a debugging convenience into a **regression test**: after any scheduler change, record a live run, replay it in simulation, and verify the decisions are byte-for-byte identical. Any divergence is a bug. + +8. **Driver event queue**: The driver shall retain an internal pending-event queue to buffer events received from the controller between scheduling rounds. Events accumulate in the driver between `BEGIN_ROUND` invocations. + +**Normal-Mode Driver** + +9. **Controller integration**: The normal-mode driver shall receive capnp push/notify messages from the controller, translate each to the corresponding core event type, and invoke the core's event push interface. The driver shall publish core-emitted decisions back to the controller via the existing `xcecli_ctx_t` API. + +10. **Runtime recording control — detailed mechanism**: The scheduler shall support runtime recording of all scheduling events and decisions to a replay file for later simulation and analysis. + + **Admin command flow**: xceadmin CLI connects directly to the controller via TLS + capnp (same as `xceadmin config push` — no apiserver, no REST). The controller receives `OPCode_schedAdmin` and forwards it to the scheduler via the existing `scheduler_t.ep` endpoint. The scheduler processes the request and replies; the controller relays the reply back to xceadmin. This is a request-reply opcode, NOT a one-way notify — recording `status` returns live scheduler state that the controller does not own. + + **Why request-reply (not notify)**: The existing `OPCode_notify` is fire-and-forget — no reply path. Recording `start`/`stop` could theoretically use notify, but `status` must return live state (`recording`, `file`, `event_count`, `started_at`). Using two different mechanisms for three commands on the same subsystem is worse than one consistent request-reply path. Additionally, `start`/`stop` benefit from a synchronous reply: `start` returns the auto-generated filename, and `stop` returns the final event count. + + **Why a dedicated opcode (not reusing OP_upgradeConfig)**: `OP_upgradeConfig` carries a config blob through the controller's own config-replication pipeline. Recording control is a scheduler-scoped admin action — it touches no controller state, needs no WAL persistence, and should be forwarded directly to the scheduler without controller-side interpretation. A dedicated `OPCode_schedAdmin` keeps these concerns separate. + + **Cap'n Proto schema additions** (in `controller.capnp`): + + New OPCode: + ```capnp + enum OPCode { + ... + schedAdmin @42; + } + ``` + + New types: + ```capnp + enum SchedAdminAction { + recordStart @0; + recordStop @1; + recordStatus @2; + } + + struct SchedAdminRequest $C.mapname("sched_admin_req_t") { + action @0: SchedAdminAction; + recordFile @1: Text; # path for recordStart; empty = auto-generate + } + + struct SchedAdminReply $C.mapname("sched_admin_reply_t") { + ok @0: Bool; + error @1: Text; # human-readable error if !ok + + # Fields populated for recordStatus (also returned by recordStart/recordStop + # for confirmation — caller can verify state after each action): + recording @2: Bool; # true between start and stop + file @3: Text; # record file path (auto-generated name returned by start) + eventCount @4: UInt64; # events written since recording started + startedAt @5: UInt64; # logical time recording started (nanoseconds since epoch) + } + ``` + + New Request.body union entry: + ```capnp + schedadminmsg @31: SchedAdminRequest; + ``` + + New RequestReply.data union entry: + ```capnp + schedadminreplymsg @19: SchedAdminReply; + ``` + + **Controller forwarding** (in `myreq_handler`): + ``` + case OPCode_schedAdmin: + → validate xceadmin auth (admin RBAC, same as config push) + → lock(&c->sched.lock) + → if sched.ep == NULL: + unlock; reply {ok=false, error="scheduler not connected"} + → forward to sched.ep via existing capnp push/request + → await scheduler reply (timeout: 5s) + → unlock + → relay SchedAdminReply back to xceadmin via RequestReply + ``` + + The controller is a **pass-through** — it owns no recording state, interprets no fields beyond the opcode dispatch. All recording logic lives in the scheduler's normal-mode driver. In the new architecture, recording is a driver-layer concern — the core has zero knowledge of whether recording is active. + + **Edge cases**: + - **Scheduler not connected** (`sched.ep == NULL`): Controller replies `{ok=false, error="scheduler not connected"}` immediately. No capnp round-trip needed. + - **Scheduler disconnects mid-request**: The 5s timeout triggers; controller replies `{ok=false, error="request timeout"}`. + - **Controller is not primary**: xceadmin's existing redirect-following logic handles this — if the contacted controller is not the primary, it redirects to the primary (same as `config push`). The scheduler is a singleton attached to the primary controller, so recording commands always reach the primary's scheduler. + + **xceadmin CLI surface**: + ``` + xceadmin scheduler record start [FILE] + → SchedAdminRequest{action=recordStart, recordFile=FILE or ""} + → Success: {ok=true, file="", recording=true, + eventCount=0, startedAt=} + → Error: {ok=false, error="already recording", recording=true, file=""} + + xceadmin scheduler record stop + → SchedAdminRequest{action=recordStop} + → Success: {ok=true, recording=false, eventCount=14273, file="", + startedAt=} + → Error: {ok=false, error="not recording", recording=false} + + xceadmin scheduler record status + → SchedAdminRequest{action=recordStatus} + → Success: {ok=true, recording=true|false, file="", + eventCount=N, startedAt=} + ``` + + **Reply field semantics by action**: + | Field | recordStart (ok) | recordStart (err) | recordStop (ok) | recordStop (err) | recordStatus | + |-------|-------------------|--------------------|------------------|--------------------|--------------| + | `ok` | true | false | true | false | true | + | `error` | "" | reason (e.g. "already recording") | "" | reason (e.g. "not recording") | "" | + | `recording` | true | true (unchanged) | false | false (unchanged) | true/false | + | `file` | current path | current path | last path (informational) | "" | current or "" | + | `eventCount` | 0 | current count | final count | 0 | current | + | `startedAt` | start time | original start | original start (historical) | 0 | original or 0 | + + **Error codes reference**: + | Condition | `ok` | `error` | + |-----------|------|---------| + | `record start` while already recording | false | `"already recording"` | + | `record stop` while not recording | false | `"not recording"` | + | Scheduler not connected to this controller | false | `"scheduler not connected"` | + | Request timeout (5s) | false | `"request timeout"` | + | Disk full / write error (start) | false | `"cannot write to : "` | + + Status output (xceadmin formats the capnp reply): + ``` + recording: yes + file: /var/log/xce/scheduler-replay-prod-cluster-1-20260729-020900.replay + events: 14273 + started at: 2026-07-29T02:09:00 + ``` + + **Permissions**: All three commands require admin-level authentication (same RBAC role as `config push`). The controller validates the xceadmin auth before forwarding to the scheduler — the scheduler trusts the controller's forwarding (same trust model as existing notify events from the controller). + + **Recording state** (in `xce_sched_driver_t`): + ```c + bool recording; // true between start and stop + char* record_file_path; // strdup'd path for status queries + FILE* record_file; // replay file handle (NULL when not recording) + uint64_t record_event_count; // counter for periodic snapshot + uint64_t record_snapshot_interval; // N events between snapshots (0 = disabled) + uint64_t record_start_ts; // logical time when recording started (0 = not started) + ``` + + `record_file_path` is a `strdup`'d copy of the auto-generated or user-specified path, owned by the record file lifecycle: `strdup` on start, `free`+NULL on stop or error. This field exists so `SchedAdminReply.file` can be populated even after `record_file` is closed — it persists for informational queries (e.g., `status` after a disk-full auto-stop). + + **Recording lifecycle — what gets written at each step:** + + 1. **On `record start`**: + - Take full core snapshot via `save_snapshot(core, &snapshot_data)` — fills `SnapshotData` struct in memory + - Write `ReplayHeader` as first message of the file (recorder version, config hash, cluster identity, timestamps, sched policy) + - Serialize `SnapshotEntry{ts, data=snapshot_data}` and write as second message + - Set `recording = true`, `record_event_count = 0` + + 2. **On each `core_push_events()` call** (driver thread, between sessions): + - For each event in the batch, serialize and write the corresponding `ReplayEvent` message to the `.replay` file + - Increment `record_event_count` for each event written + + 3. **On `core_go()`** (driver thread, start of session): + - Begin building a `ReplaySession` message with `beginRound = xce_core_now(core)` + + 4. **In the decision drain loop** (driver thread, during session): + - For each decision from `cbuf_get(&decisions)`: append a `ReplayDecision` to the current `ReplaySession.decisions` list + - Decisions are in allocator output order, before the NULL end-of-session marker + + 5. **On `core_end_session()`** (driver thread): + - Finalize the `ReplaySession` with session summary, write the complete message to the `.replay` file + + 6. **On periodic checkpoint** (driver thread): + - If `record_event_count > 0 && record_event_count % record_snapshot_interval == 0`: + - Serialize and write `SnapshotEntry` message from `save_snapshot(core, &snapshot_data)` + + 7. **On `record stop`**: + - Write `ReplayEvent{endSession}` message + - `fflush()` + `fclose()` the record file + - Set `recording = false`, `record_file = NULL` + + **Recording insert points in the normal-mode driver main loop** (annotated): + ```c + while (!sched.stop) { + sched_update(&sched); // process capnp push/notify + // [RECORDING] write each buffered event as ReplayEvent message + // [RECORDING] periodic checkpoint check + + sched_begin_session(&sched); + // [RECORDING] build ReplaySession{beginRound = now} + sched_go(&sched); + + while (cbuf_get(&sched.decisions, &d), d) { + // [RECORDING] append ReplayDecision to session + switch (d->op) { + case DISPATCH: sched_publish_dispatch(...); break; + case PEND: sched_publish_pend_reason(...); break; + case PREEMPT: sched_publish_preempt(...); break; + } + } + + sched_end_session(&sched); + // [RECORDING] finalize + write ReplaySession message + // [RECORDING] periodic checkpoint after session + sleep(1); + } + ``` + + **Performance**: When recording is inactive (`recording == false`), the scheduler shall incur zero overhead — no file I/O, no extra allocations, no event buffering beyond what the non-recording path already does. The recording check is a single boolean branch per session. + + **Error handling**: If writing to the record file fails (disk full, permission error), the driver shall log the error, set `recording = false`, `fflush()` + `fclose()` the record file, `free(record_file_path)` + set `record_file_path = NULL`, and continue normal scheduling operation. Recording failure shall not cause the scheduler to stop or crash. + +11. **Periodic snapshot during recording**: While recording is active, the driver shall periodically append fresh snapshots to the replay file (default: every `N` events, configurable via `--record-snapshot-interval N`, N=0 disables periodic snapshots). + +12. **Session response time metrics**: The core shall track session duration for diagnostics. At `core_go()`, the core stores `session_start = xce_core_now()`. At `core_end_session()`, the core computes `session_duration_ns = xce_core_now() - session_start`. The duration is written to the `ReplaySession.summary` field as a `SessionSummary` struct. The `SessionSummary` is optional for replay correctness (the simulation driver ignores it) but provides valuable diagnostics: + - **Normal mode**: reveals real scheduling latency — is the picker slow? is allocation the bottleneck? + - **Simulation mode**: in real-time mode, compare virtual vs wall-clock session duration; in fast mode, the virtual clock freezes during `core_go()` so `duration_ns` is typically 0 (all decisions at same `ts`) + - **Tuning**: diff session durations before and after a policy change to quantify performance impact + + The core stores `session_start` internally — no new API functions, no change to the `on_decision` callback, no overhead beyond a single `xce_core_now()` call per session. + +**Simulation-Mode Driver** + +13. **Simulation mode startup**: The scheduler shall support simulation mode activated by `--sim FILE` and `--sim-start-ts TIMESTAMP`. The startup sequence is: + + **Step 1 — Open and validate replay file:** + ``` + sim->replay_file = fopen(arguments.sim_file, "r"); + read first capnp message → validate it is ReplayHeader + ``` + If the file is missing, unreadable, or the first message is not a valid `ReplayHeader`, the simulation driver shall fail with a clear error message. + + **Step 2 — Locate starting snapshot:** + ``` + scan forward from ReplayHeader, decode each SnapshotEntry + find the most recent SnapshotEntry with ts <= --sim-start-ts + ``` + If no `SnapshotEntry` exists after `ReplayHeader`, the simulation driver shall reject the file. Without initial state, simulation has no starting point. + + **Step 3 — Load snapshot and rebuild picker:** + ``` + xce_sched_core_load_snapshot(&sim->core, snapshot_entry.data) + // Walk core state to rebuild picker private state: + for each queue in core.queues: + picker->on_queue_update(picker, queue) + for each job in core.jobs where job.state & JOB_STAT_PEND: + picker->on_job_push(picker, job) + ``` + After this step, core state and picker state are fully restored. The core is ready to run. + + **Step 4 — Set virtual clock:** + ``` + sim->core.virtual_clock_base = snapshot_ts + sim->core.real_clock_base = clock_gettime(CLOCK_MONOTONIC) // wall anchor + sim->core.speed_num = arguments.sim_speed // 0=fast, 1=real-time, N>1=N× + sim->core.speed_den = 1 + ``` + From this point, `xce_core_now()` returns virtual time computed from the snapshot's logical timestamp. + + **Step 5 — Enter event loop (AC 18):** accumulate events → BEGIN_ROUND → `core_push_events` → `core_go` → drain decisions → `core_end_session` → repeat until EOF. + + The `ReplayHeader` + `SnapshotEntry` together form the complete self-contained starting point. Nothing outside the replay file is needed to begin simulation. + +14. **Discrete event-driven virtual clock**: The simulation driver shall implement a virtual clock that advances by jumping directly to the timestamp of the next queued event — no fixed tick interval, no wall-clock waiting. Strictly monotonically increasing. Same-timestamp events delivered in file order. Supports: + - `--sim-speed N` — N=0 as-fast-as-possible, N=1 real-time, N>1 N× real-time + - `--interactive` / `-i` — open REPL for step-through debugging, breakpoints, state inspection, and snapshot capture (AC 22) + +15. **Deterministic replay verification**: In simulation mode with `--sim-verify`, the driver shall compare each core-emitted decision against the recorded decisions in the replay file. Any mismatch shall be reported as a regression with exact logical-time and decision-detail context. + +16. **What-if branching**: The simulation driver shall accept `--sim-alt-events FILE`. When both a base `.replay` file (for snapshot loading) and an alt-events file are provided, the driver loads the snapshot from the base file, then replays events from the alt-events file (same `.replay` capnp stream format) — enabling "what-if" analysis. + +17. **Simulation isolation**: In simulation mode, the scheduler process shall not establish any connection to the controller. The `xce_sched_sim_driver_t` shall contain no `xcecli_ctx_t`, no `xce_cluster_config_t`, no capnp socket, and no RPC to any controller. All scheduling input comes exclusively from the replay file. All scheduling decisions go to the simulation record file (see AC 19) and/or stdout. Attempting to use a controller-facing API from simulation mode is a programming error that shall be caught at compile time (via struct field absence) or fail with a clear error at startup. + +18. **BEGIN_ROUND as session boundary**: The simulation driver shall treat each `ReplaySession` message as the trigger for one complete scheduling session. The driver accumulates `ReplayEvent` messages into a batch, and upon encountering `ReplaySession`, executes the full session cycle: + + ```c + // Simulation driver event loop + xce_core_event_t buf_events[MAX_EVENTS_PER_ROUND]; + int buf_n = 0; + + while (decode_next_message(replay_file, &msg) == 0) { + switch (msg.which) { + case ReplayEvent: + buf_events[buf_n++] = replay_event_to_core_event(&msg.event); + break; + + case ReplaySession: // ← SESSION BOUNDARY + // 1. Push accumulated events (picker hooks called synchronously) + core_push_events(&sim->core, buf_events, buf_n); + + // 2. Kick scheduling round (non-blocking signal to picker thread) + core_go(&sim->core); + + // 3. Drain decisions until end-of-session marker (NULL) + xce_decision_t* d; + int di = 0; + while (cbuf_get(&sim->core.decisions, &d) == 0 && d != NULL) { + // 4. Compare against recorded decisions (if verify enabled) + if (sim->verify && di < msg.session.decisions.len) { + xce_decision_t expected = from_replay_decision(msg.session.decisions[di]); + if (!decision_eq(&expected, d)) + log_mismatch(sim, &expected, d); // --sim-verify + di++; + } + if (sim->record_file) + write_replay_decision(sim->record_file, d); // record output + free_decision(d); + } + + // 5. End session (GC, reset workers) + core_end_session(&sim->core); + buf_n = 0; // reset for next round + break; + + case SnapshotEntry: + // Mid-replay snapshots (periodic checkpoints): skipped during replay. + // Only the initial SnapshotEntry (loaded at startup) is consumed. + break; + } + } + ``` + + The driver thread blocks during the decision drain loop (step 3-4) because `cbuf_get(&decisions)` blocks until the allocator produces a decision or the end-of-session marker. The `core_go()` call itself is non-blocking (it only signals the picker thread via `cbuf_put(&wbuf)` and returns immediately). After all decisions are drained and the NULL marker arrives, `core_end_session()` runs cleanup, and the driver resumes reading the next message from the `.replay` file. + + **Decision ordering constraint**: `ReplayDecision` messages appear within the `ReplaySession.decisions` list. Their order matches the allocator thread's output order through the `decisions` cbuf. A `ReplayDecision` appearing outside a `ReplaySession` is a format error. + +19. **Simulation record file**: In simulation mode with `--sim-output FILE`, the driver shall write a `.replay` file in the identical capnp stream format as the input replay file (`ReplayHeader` → `SnapshotEntry` → `ReplayEvent` → `ReplaySession` cycles). This record file captures the simulation's actual decisions, enabling: + + - **Diff-based debugging**: `diff <(xceadmin scheduler dump original.replay) <(xceadmin scheduler dump simulated.replay)` reveals exactly which decisions changed + - **Tuning feedback loop**: Modify picker parameters, re-run simulation, diff the record files to quantify the impact + - **What-if comparison**: Compare `--sim-alt-events` run output against the base run output + + The record file starts with a `ReplayHeader` (carrying scheduler version + config hash from the sim run, NOT copied from the replay file), followed by the same `SnapshotEntry` that was loaded, then events + `ReplaySession` cycles exactly as produced by the core. If `--sim-output` is not specified, decisions are printed to stdout only and no record file is written. + + **Symmetry with normal-mode recording**: Both the normal-mode driver (when recording is active, AC 10) and the simulation-mode driver (with `--sim-output`) produce `.replay` files in the identical capnp stream format. The same file layout, same message types, same decision encoding. This symmetry is intentional: + + | Aspect | Normal-mode recording | Simulation `--sim-output` | + |--------|----------------------|---------------------------| + | Trigger | `scheduler record start` (runtime) | `--sim-output FILE` (CLI at startup) | + | Input source | Controller capnp events | Replay file events | + | Writes events? | Yes — records all input events as `ReplayEvent` messages | Yes — passes through events from replay file as `ReplayEvent` messages | + | Writes decisions? | Yes — records scheduler decisions in `ReplaySession` messages | Yes — records simulated decisions in `ReplaySession` messages | + | Output file | `.replay` file (for later simulation) | `.replay` file (for diff analysis) | + | `ReplayHeader` origin | Live cluster metadata | Sim run metadata | + | `SnapshotEntry` origin | `save_snapshot(core)` at record start | `SnapshotEntry` from replay file | + | Purpose | Capture reality | Capture simulation result | + + This means `diff <(xceadmin scheduler dump original.replay) <(xceadmin scheduler dump simulated.replay)` works out of the box — both files have the same structure, same timestamps, same event types. Only the decisions may differ, which is exactly what you want to compare. + +**Replay File Format** + +20. **Single-file capnp stream format (`.replay`)**: The replay file shall be a single file containing consecutive Cap'n Proto messages in the standard framing (segment table + data per message). Each message is one of the types below. The file is appendable — recording writes each message as it occurs; no need to know final size upfront. + + **File suffix**: `.replay` — self-documenting, no collision with schema files (`.capnp`), configuration blobs (`.bin`), or text formats (`.json`, `.jsonl`). + + **Schema** (in `controller.capnp`): + + ```capnp + struct ReplayHeader { + recorderVersion @0: Text; # scheduler binary version that wrote this file + configHash @1: Data; # sha256 of xce_conf4sched_t + cluster @2: ReplayCluster; + recordingStartTs @3: UInt64; # logical time recording started (ns) + recordingStartWall @4: Text; # wall-clock time recording started (ISO 8601) + schedPolicy @5: Text; # active picker plugin name (e.g. "builtin_fcfs") + } + + struct ReplayCluster { + name @0: Text; + controllers @1: List(Text); # ["host1:9991", "host2:9992", "host3:9993"] + recordingHost @2: Text; # controller hostname that made the recording + } + + struct SnapshotEntry { + ts @0: UInt64; # logical time of snapshot + data @1: SnapshotData; # full core state + } + + struct ReplayEvent { + ts @0: UInt64; # logical time + body @1: union { + configPush @2: Conf4Sched; + jobsPush @3: SchedJobData; + workersPush @4: WorkerData; + resourcesPush @5: ResourceData; + resvalsFull @6: ResValList; + resvalsDelta @7: ResValList; + jobStateChange @8: JobStateChangeEvent; + jobUpdate @9: JobUpdateEvent; + queueUpdate @10: QueueConf; + jobRusage @11: SchedJobRusages; + endSession @12: Void; # recording stop marker + } + } + + struct ReplaySession { + beginRound @0: UInt64; # logical time (ts value) + decisions @1: List(ReplayDecision); + summary @2: SessionSummary; # optional diagnostic metadata + } + + struct ReplayDecision { + ts @0: UInt64; + body @1: union { + dispatch @2: DispatchDecision; + pend @3: PendDecision; + preempt @4: PreemptDecision; + } + } + + struct SessionSummary { + durationNs @0: UInt64; + nDecisions @1: UInt32; + nDispatched @2: UInt32; + nPended @3: UInt32; + } + ``` + + **File structure**: The `.replay` file is a single stream of consecutive capnp messages: + + ``` + [msg 1] ReplayHeader + [msg 2] SnapshotEntry ← initial state (MUST be present, MUST be first after header) + [msg 3] ReplayEvent ← input event + [msg 4] ReplayEvent ← input event + ... + [msg N] ReplaySession ← BEGIN_ROUND → decisions → SESSION_SUMMARY + [msg N+1] ReplayEvent + ... + [msg M] SnapshotEntry ← periodic checkpoint (every N events, AC 11) + ... + [msg K] ReplayEvent{endSession} ← recording stop marker + ``` + + - **`ReplayHeader`**: first message. Identifies the file type (`.replay` files start with a known capnp struct, not an ambiguous byte sequence). Carries metadata about the recording origin — recorder version, config hash, cluster identity, timestamps, active scheduling policy. + - **The `.replay` file is fully self-contained**: the `ReplayHeader` identifies which config was active (`configHash`), and the first `SnapshotEntry` carries the full config payload plus all scheduling state. No external config file, controller, or database is needed to replay — one file has everything. + - **`SnapshotEntry`**: the first data message after `ReplayHeader` MUST be a `SnapshotEntry`. The simulation driver shall reject any `.replay` file whose second message is not a `SnapshotEntry` — without initial state, simulation has no starting point. Mid-stream `SnapshotEntry` messages (from periodic recording, AC 11) provide seek points for `--sim-start-ts`. + - **`ReplayEvent`**: input event carrying payload in a discriminated union. The `body` union tag selects the event type (`configPush`, `jobsPush`, etc.). No separate `"type"` field needed — the capnp union tag is the type discriminator. + - **`ReplaySession`**: groups a `BEGIN_ROUND` trigger with its resulting decisions and session summary. A `ReplaySession` between `ReplayEvent` messages marks a session boundary; a `ReplayDecision` outside a `ReplaySession` is a format error. Decision order within `decisions` matches allocator output order. + - **`ReplayEvent{endSession}`**: final message in a completed recording. Signals clean shutdown. The simulation driver ignores it (replay runs until EOF). + - No text parsing, no JSON schema, no two-format code paths — the same capnp decode path reads every message. The simulation driver decodes each message sequentially from the stream. + + **Human inspection**: `xceadmin scheduler dump ` decodes a `.replay` file to human-readable text. xceadmin already bundles `controller.capnp` schemas for `config push`/`config build` — `scheduler dump` adds one new subcommand reusing the same schema infrastructure. + + **Recording (append)**: The `.replay` format is append-friendly — `save_snapshot()` and event writes serialize one capnp message at a time. On `record start`: write `ReplayHeader` + initial `SnapshotEntry`. Each event: write one `ReplayEvent`. Each session: write one `ReplaySession`. Periodic checkpoint: write one `SnapshotEntry`. On `record stop`: write `ReplayEvent{endSession}` + fflush + fclose. Recording failure mid-write: the file is truncated to the last complete message — no partial-message corruption. + + **Simulation (read)**: `--sim-start-ts NS` seeks forward through `SnapshotEntry` messages (deserialize each, check `ts <= NS`, keep latest match), loads the matching snapshot, then replays all messages with `ts >= NS`. + +**State Snapshot** + +21. **Snapshot serialization**: The core shall support `save_snapshot()` producing a `SnapshotData` capnp struct containing all scheduler configuration (`xce_conf4sched_t*` — queues, priorities, resource thresholds, preemption config, time windows), jobs, workers, resources, resvals, users, projects, shared-resource tracking state, unsatisfiable-resreq cache, PRNG state, and session state. The core shall support `load_snapshot()` restoring from `SnapshotData` to that exact state. + + **The snapshot is fully self-contained for simulation.** After `load_snapshot()` and picker rebuild, the core is ready to process `core_push_events()` + `core_go()` and produce decisions — no other state, external config, or preceding events are needed. Given a `.replay` file, the simulation driver can start from any `SnapshotEntry` (via `--sim-start-ts`): load the snapshot, rebuild picker, set virtual clock to snapshot `ts`, then replay all messages with `ts >= snapshot.ts`. The result is identical to replaying from the beginning — the snapshot is a complete checkpoint. + + **Picker state is NOT stored in snapshot.** The builtin picker's private state (`ordq_t queues`, per-queue `ordq_t pendJobs`) is derived from core state: every queue → `on_queue_update`, every pending job → `on_job_push`. After `load_snapshot()` restores core state, the driver shall rebuild the picker's private state by walking the core's queues and jobs and calling the picker's state-change hooks. This ensures: + - Snapshots capture only canonical core state (no duplicate of picker internals) + - Picker rebuild is deterministic: same core state + same hook sequence = same picker state + - Custom pickers with additional state can rebuild from the same core-state walk + + **Snapshot contents checklist** — everything required to run a scheduling session: + + | Category | Contents | + |----------|----------| + | Config | `xce_conf4sched_t*` — all queues, priorities, resource thresholds, preemption config, time windows | + | Jobs | All job records with current state, priority, queue assignment, queue_time | + | Queues | All queue definitions with RUNLIMIT, MAX_RUNNING, state, per-queue picker override | + | Workers | All worker records with resources, state, assigned jobs | + | Resources | Resource definitions (resreq templates) | + | Resvals | Current resource value snapshots for all workers | + | Users | User records with resource limits, group membership | + | Projects | Project scaffolding with priority (v1: flat, v2: hierarchical quota) | + | Shared-resource | Shared resource tracking state across workers | + | Unsatisfiable cache | Resreqs that could not be satisfied in previous rounds (for early skip) | + | Session state | Current scheduling round, iterator positions, GC state | + | PRNG state | Current PRNG value (for deterministic tie-breaking resume mid-file) | + +22. **Interactive simulation REPL**: In simulation mode with `--interactive` (or `-i`), the scheduler shall open a read-eval-print loop on stdin/stdout after loading the replay file but before the first event is processed. The REPL gives the operator full control over simulation execution — single-step, breakpoints, state inspection, and snapshot capture — turning the simulation driver into a real debugger for scheduling policy. + + **Interaction model**: The simulation process blocks on stdin at startup (pre-replay pause) and at each breakpoint hit. No controller, no network, no authentication — this is a local investigation tool. The REPL prompt is `(sim) `. + + **Minimum command set**: + + **Execution control**: + | Command | Description | + |---------|-------------| + | `step [N]` | Advance N sessions (default 1), pause after. Processes all events up to and including the Nth `BEGIN_ROUND` from the current position, then returns to REPL. | + | `continue` | Run until next breakpoint hit or EOF. If no breakpoints are set, runs to completion. | + | `quit` | Exit the scheduler immediately. No cleanup guarantees beyond `fclose` on open files. | + + **Breakpoints**: + | Command | Description | + |---------|-------------| + | `break [key=value ...]` | Set breakpoint on event type (e.g., `JOB_STATE_CHANGE`, `JOB_PUSH`, `BEGIN_ROUND`, `DECISION`). Optional key=value filters narrow the match: `break JOB_STATE_CHANGE jobid=12345`, `break JOB_STATE_CHANGE state=RUN`, `break DECISION type=DISPATCH queue=normal`. Multiple filters are AND'd. Key names match the field names in the capnp schema for each message type. | + | `info break` | List all breakpoints with their IDs, event types, and filters. | + | `delete ` | Delete breakpoint by ID. `delete all` removes all breakpoints. | + + **State inspection**: + | Command | Description | + |---------|-------------| + | `info session` | Show current simulation position: logical time (`xce_core_now()`), event index (Nth message processed), session count, last `SessionSummary` if available. | + | `info job ` | Dump one job: state, queue, priority, queue_time, resreq, allocations. Jobid uses the same format as xcecli (e.g., `12345`). | + | `info queue ` | Dump one queue: priority, state (open/closed), RUNLIMIT, MAX_RUNNING, job_pick_plugin, list of queued job IDs with priorities. `info queue all` lists all queues. | + | `info worker ` | Dump one worker: state, resources (total + available), assigned jobs. `info worker all` lists all workers. | + | `info resource ` | Dump one resource: type, total capacity, available, allocation count. `info resource all` lists all resources. | + | `info summary` | Quick overview: `N_jobs (M pending, K running), N_workers (M online), N_queues, N_resources`. | + + **Snapshots**: + | Command | Description | + |---------|-------------| + | `snapshot [FILE]` | Write a full `save_snapshot()` to FILE as a standalone `.replay` file (contains `ReplayHeader` + `SnapshotEntry`). If FILE is omitted, auto-generate: `-snap-.replay`. The snapshot is a complete state dump (same format as periodic recording checkpoints). The operator can restart simulation from this snapshot via `--sim --sim-start-ts `. | + + **Help**: + | Command | Description | + |---------|-------------| + | `help` | Print available commands with one-line descriptions. Covers all REPL commands: execution control (`step`, `continue`, `quit`), breakpoints (`break`, `info break`, `delete`), state inspection (`info session/job/queue/worker/resource/summary`), snapshots (`snapshot`), sim parameters (`set`, `info config`). | + + **Simulation parameters** (interactive `set` / `info config`): + | Command | Description | + |---------|-------------| + | `set speed ` | Set simulation speed from this point forward. `0` = as-fast-as-possible (no wall-clock delay), `1` = real-time, `N` = N× real-time. Overrides the `--sim-speed` CLI value. | + | `set output ` | Start writing simulation decisions to FILE in the same `.replay` capnp stream format as `--sim-output`. Opens `ReplayHeader`+`SnapshotEntry` at the current position if the file is new. File is written incrementally — each subsequent session's decisions land in the file. | + | `set output off` | Close the current output file. Subsequent decisions are not recorded. `info config` confirms the file path and event count at close time. | + | `set verify on\|off` | Enable or disable decision verification against the recorded replay file. When enabled, each decision is compared against the corresponding recorded decision at the same logical time. Mismatches are printed immediately. Default: matches `--sim-verify` CLI flag. | + | `info config` | Show current sim parameters: `speed=N, output=, verify=on|off, events_processed=N, current_ts=, sessions=N`. | + + **Why interactive parameters matter**: Without these, tuning simulation requires restart: change `--sim-speed`, re-run from snapshot, re-check results. With `set speed` and `set output`, the operator can fast-forward through known-good regions (`set speed 0`), slow down for suspicious sections (`set speed 0.1`), and only start recording output when the interesting behavior starts — all in one session. This turns the REPL from a passive inspector into an active investigation tool where parameters co-evolve with the operator's understanding of the trace. + + **REPL integration with the simulation loop**: + ``` + load replay file + snapshot + if --interactive: + print "[sim] loaded: N events, snapshot @ ts=..." + print "[sim] ready. type 'help' for commands." + repl_pause() // pre-replay pause — operator can set breakpoints + + for each event in replay_file: + // ── sim parameter: speed ── + if sim->sim_speed_num > 0: + wall_clock_delay(delta_ns * sim->sim_speed_den / sim->sim_speed_num) + + if check_breakpoints(event): + print "[sim] hit breakpoint @ event #I: ..." + repl_pause() + + core_push_events(core, event) + + if msg.which == ReplaySession: + core_go(core) + for each decision: + // ── sim parameter: verify ── + if sim->verify: + compare_and_report(decision, expected) // AC 15; REPL 'set verify on/off' + + // ── sim parameter: output ── + if sim->output_file: + write_replay_decision(sim->output_file, decision) // AC 19; REPL 'set output' + + if check_breakpoints(decision): + print "[sim] hit breakpoint @ decision: job=..." + repl_pause() + + if --interactive: + print "[sim] replay complete. N_sessions processed." + if sim->output_file: + print "[sim] output written to: " + ``` + + **What is NOT in v1**: + - **Write-side mutations to scheduler state**: No `set queue priority`, `set job state`, `add job`, `remove job`. The `set` command in v1 only tunes simulation parameters (`speed`, `output`, `verify`) — it never mutates core scheduling state. Operator inspects state but cannot alter it. What-if analysis uses `--sim-alt-events` (AC 16) instead. State mutation from REPL is a follow-up. + - **Reverse execution**: No `step back` or time-travel undo. Operator can restart from snapshots captured at earlier points. + - **Expression evaluation**: No `print core->sessions_count` or arbitrary C evaluation. Commands are fixed. + - **Scripting/batch mode**: No `source FILE` or `-c "step 5; info summary"`. The REPL is interactive-only. For automated simulation runs, use the batch flags (`--sim`, `--sim-output`, `--sim-verify`) without `--interactive`. + - **No semantic `snapshot diff` in xceadmin**: `xceadmin scheduler dump` produces human-readable output. Comparing two dumps (`diff <(xceadmin scheduler dump snap1) <(xceadmin scheduler dump snap2)`) works but is generic text diff — no scheduler-aware semantic diff ("queue priority changed from 10 to 20", "3 new jobs added"). Semantic diff is a v2 feature. + + **Deterministic replay is preserved**: The REPL never alters core state or event stream. It only controls *when* events are processed (by pausing), not *what* events are processed. The same replay file with the same breakpoints ignored (treated as skip) produces identical decisions as batch mode. Interactive use with `step` and `continue` that runs to completion produces the same output as `--sim` without `--interactive`. + + **Implementation note**: The REPL is a single `fgets` loop in the simulation driver. It is not a separate thread — when the REPL blocks on stdin, the simulation loop is parked. This is correct and intentional: the operator is in control, and the simulation has no wall-clock deadlines. + +Full object sharing (resreq template registry, pend reason dedup pool) is deferred to a follow-up spec. However, the architecture must not block sharing from being added later: + +1. **Resreq immutability**: Resreq objects shall be treated as immutable once created. No code path shall mutate a resreq in place. This ensures sharing via `const` pointer is safe to introduce later. + +2. **Pend reason factory**: All pend reason allocation shall go through `make_pendreason()` (the single factory in `lib/preason.c`). Callers never `calloc(sizeof(xce_pendreason_t))` directly. + +3. **Pointer-identity fast path**: Code comparing two resreqs or pend reasons shall use pointer equality (`a == b`) as a fast path before deep comparison. + +4. **Select expression memoization**: The existing `select_eval_ctx_t` per-session memoization shall be preserved and extended. Parsed/evaluated form attached to resreq on first evaluation, reused for subsequent evaluations. + +5. **Snapshot forward-compatibility**: The snapshot format shall not preclude object sharing. Shared objects shall be serializable by identity (object table with IDs). + +These invariants impose zero overhead today but rule out design choices that would make sharing expensive or impossible to retrofit. + +## Data Structure Changes Summary + +### `xce_scheduler_t` additions +```c +char* job_pick_plugin; // default: "builtin_fcfs" (Req 2) +``` + +### `xce_sched_queue_t` additions +```c +char* project_name; // owning project (picker uses internally) +char* job_pick_plugin; // per-queue picker override (NULL = use global) +``` + +### `xce_sched_project_t` additions +```c +int32_t priority; // inter-project ordering (future spec) +// future: resource_quota, resource_used, parent_project +``` + +### `xce_job_picker_iface_t` (new) +```c +typedef struct { + int (*init)(void* picker, xce_sched_core_t* core); + void (*fini)(void* picker); + int (*begin_session)(void* picker); + xce_sched_job_t* (*next_job)(void* picker); + int (*end_session)(void* picker); + int (*on_dispatch)(void* picker, uint64_t jobid); + int (*on_pend)(void* picker, uint64_t jobid); + int (*on_queue_update)(void* picker, xce_sched_queue_t* queue); + int (*on_job_push)(void* picker, xce_sched_job_t* job); + int (*on_job_state_change)(void* picker, xce_sched_job_t* job, uint32_t state); + int (*on_job_update)(void* picker, xce_sched_job_t* job); + int (*on_config)(void* picker, xce_conf4sched_t* config); + int (*on_job_rusage)(void* picker, xce_sched_job_t* job, xce_job_rusages_t* rusages); +} xce_job_picker_iface_t; +``` + +### Core/Driver split +```c +// Core event (driver → core) +typedef enum { XCE_CORE_EVENT_CONFIG_PUSH = 0, XCE_CORE_EVENT_JOBS_PUSH, + XCE_CORE_EVENT_WORKERS_PUSH, XCE_CORE_EVENT_RESOURCES_PUSH, + XCE_CORE_EVENT_RESVALS_FULL, XCE_CORE_EVENT_RESVALS_DELTA, + XCE_CORE_EVENT_JOB_STATE_CHANGE, XCE_CORE_EVENT_JOB_UPDATE, + XCE_CORE_EVENT_QUEUE_UPDATE, XCE_CORE_EVENT_JOB_RUSAGE, + XCE_CORE_EVENT_BEGIN_ROUND } xce_core_event_type_t; + +typedef struct { + xce_core_event_type_t type; + uint64_t ts; + union { /* event-type-specific payload */ } payload; +} xce_core_event_t; + +typedef int (*xce_core_decision_cb_t)(void* driver_ctx, xce_decision_t* decision); + +typedef struct { + // Scheduling state (moved from xce_scheduler_t) + xce_conf4sched_t* config; var plugins; var jobs, queues, workers, users, projects; + // ... (full state) + + // Core/driver boundary + void* driver_ctx; + xce_core_decision_cb_t on_decision; + + // Internal threading — cbuf producer/consumer + pthread_t picker_thread, allocator_thread; + cbuf_t wbuf; // driver→picker trigger (int, cap=1) + cbuf_t jbuf; // picker→allocator job handoff (uint64_t, cap=1) + cbuf_t decisions; // allocator→driver decision output (xce_decision_t*, cap=5) + _Atomic int session_active; // 1 during session, 0 between + + // Clock virtualization — atomically updated by driver + _Atomic uint64_t virtual_clock_base, real_clock_base, speed_num, speed_den; + uint64_t prng_seed; + + // Picker plugin slot + char* job_pick_plugin; +} xce_sched_core_t; + +typedef struct { + xce_sched_core_t core; + xcecli_ctx_t apictx; + xce_cluster_config_t cluster_cfg; + dataq_t* pend_updates[2]; + // Recording state (driver-layer only — core is unaware) + char* record_file_path; // strdup'd path for status queries (AC 10) + FILE* record_file; // replay file handle (NULL when not recording) + bool recording; + uint64_t record_event_count; + uint64_t record_snapshot_interval; + uint64_t record_start_ts; +} xce_sched_driver_t; + +typedef struct { + xce_sched_core_t core; + FILE *replay_file, *alt_events_file, *record_file; + // sim parameters (mutable via REPL 'set' command — AC 22) + uint64_t sim_speed_num, sim_speed_den; // 0/1=fast, 1/1=real-time, N/1=Nx + bool verify; // decision comparison on/off + bool interactive; // REPL active +} xce_sched_sim_driver_t; + +// Core interface +int xce_sched_core_init(xce_sched_core_t*, xce_core_decision_cb_t, void* driver_ctx, uint64_t prng_seed); +int xce_core_push_events(xce_sched_core_t*, xce_core_event_t* events, int nevents); // batch push before session +int xce_core_go(xce_sched_core_t*); // NON-BLOCKING: signal picker thread +int xce_core_end_session(xce_sched_core_t*); // GC, reset workers +uint64_t xce_core_now(xce_sched_core_t*); // virtualized clock accessor +int xce_sched_core_save_snapshot(xce_sched_core_t*, SnapshotData* out); // fills out with core state +int xce_sched_core_load_snapshot(xce_sched_core_t*, const SnapshotData* in); // restores from snapshot +void xce_sched_core_fini(xce_sched_core_t*); +``` + +## Architecture Diagrams + +### Internal Core Thread Architecture (Multi-Threaded, cbuf-Based) + +``` +┌──────────────────────────────────────────────────────────────────┐ +│ CORE (process) │ +│ │ +│ [PICKER THREAD] [ALLOCATOR THREAD] │ +│ │ +│ cbuf_get(&wbuf) ──┐ cbuf_get(&jbuf) ──┐ │ +│ begin_session() │ try_allocate() │ │ +│ while next_job(): │ can_preempt() │ │ +│ cbuf_put(&jbuf,─┼──► cbuf_put( │ │ +│ &jobid) │ &decisions,──► on_decision callback │ +│ cbuf_put(&jbuf, 0) │ &decision) │ │ +│ end_session() │ (NULL on EOS) │ │ +│ ┌─────────────────┘ ┌─────────────────┘ │ +│ │ │ │ +│ │ wbuf jbuf │ decisions │ +│ │ (int) (uint64_t) │ (xce_decision_t*) │ +│ │ cap=1 cap=1 │ cap=5 │ +│ └─────────────────────────┴──────────────────────────────────────│ +│ │ +│ [Clock atoms — lock-free] [Core state] │ +│ virtual_clock_base queues, jobs, workers │ +│ real_clock_base plugins, resources, resvals │ +│ speed_num, speed_den picker plugin instance │ +│ prng_seed users, projects │ +└──────────────────────────────────────────────────────────────────┘ +``` + +### Core Scheduling Loop (per-round) + +``` + ┌─────────────────────┐ + │ DRIVER THREAD │ + │ │ + │ core_push_events() │ ← batch: CONFIG_PUSH, JOBS_PUSH, + │ picker hooks │ JOB_STATE_CHANGE, QUEUE_UPDATE, + │ called sync │ WORKERS_PUSH, RESVALS_*, etc. + │ │ + │ core_go() ──────────┼── cbuf_put(&wbuf, &go) + │ NON-BLOCKING │ + │ │ + │ while (1): │ + │ cbuf_get(&decisions)── block per decision + │ if NULL: break │ ← end-of-session marker + │ on_decision(d) ───┼── publish to controller NOW + │ │ (xcecli_jobdispatch / + │ core_end_session() │ xcecli_set_pend_reason / + │ │ xcecli_preempt) + │ sleep(1) or next │ + │ event trigger │ + └─────────────────────┘ +``` + +### Core/Driver Architecture + +``` +┌──────────────────────────────────────────────────────────────┐ +│ DRIVER LAYER │ +│ Normal Mode Simulation Mode │ +│ controller capnp ──┐ replay.replay ──┐ │ +│ handler → events │ virtual clock │ │ +│ → publish decisions│ → record/log │ │ +│ │ ▲ │ │ ▲ │ │ +└───────┼───────┼─────┴──────────────┼───────┼───┴──────────────┘ + │ │ decisions │ │ decisions + ▼ │ ▼ │ +┌──────────────────────────────────────────────────────────────┐ +│ SCHEDULER CORE │ +│ core_push_event() → picker hooks → picker->next_job() │ +│ → try_allocate() → on_decision() → DISPATCH / PREEMPT / PEND │ +│ ZERO dependencies on: controller, capnp, network, wall-clock, filesystem │ +└──────────────────────────────────────────────────────────────┘ +``` + +## Future: Project Resource Ownership + +Deferred to a separate `project-resource-ownership` spec. When implemented: + +- Projects form a tree with resource quota at each node +- A project-aware picker plugin selects which project gets resources, then iterates queues scoped to that project, then jobs within each queue +- The core scheduling loop requires zero code changes — only a new picker plugin replaces `builtin_fcfs` +- `queue->project_name` (added here) provides the queue→project mapping the v2 picker consumes +- `xce_sched_project_t` scaffolding (added here) provides the struct the v2 picker extends + +The architecture is designed so that v1 (flat, `builtin_fcfs` ignores projects) and v2 (hierarchical, project-aware picker) share the identical core scheduling loop. The only difference is which picker plugin is configured. diff --git a/.kiro/specs/scheduler-core/spec.json b/.kiro/specs/scheduler-core/spec.json new file mode 100644 index 0000000..2e662d7 --- /dev/null +++ b/.kiro/specs/scheduler-core/spec.json @@ -0,0 +1,26 @@ +{ + "feature_name": "scheduler-core", + "created_at": "2026-07-27T00:00:00Z", + "updated_at": "2026-07-27T00:00:00Z", + "language": "en", + "phase": "requirements-generated", + "parent_spec": "scheduler-framework", + "description": "Core/driver separation, pluggable job picker interface, and simulation mode for the XCE scheduler", + "approvals": { + "requirements": { + "generated": true, + "approved": false + }, + "design": { + "generated": false, + "approved": false + }, + "tasks": { + "generated": false, + "approved": false + } + }, + "ready_for_implementation": false, + "blocked_on": [], + "sibling_specs": ["scheduler-allocation", "scheduler-preemption"] +} diff --git a/.kiro/specs/scheduler-framework/brief.md b/.kiro/specs/scheduler-framework/brief.md index e556d22..82a7e10 100644 --- a/.kiro/specs/scheduler-framework/brief.md +++ b/.kiro/specs/scheduler-framework/brief.md @@ -2,13 +2,14 @@ ## Problem The XCE scheduler has a plugin architecture but critical gaps prevent it from being a real framework: -1. **Job selection policy is hardcoded** — `sched_job_picker()` in `scheduler.c:39` uses the literal string `"xce_sched_fcfs"`. No way to swap policies without recompilation. The picker is monolithic — it both chooses which queue to serve and which job within the queue. +1. **Job selection policy is hardcoded** — `sched_job_picker()` in `scheduler.c:39` uses the literal string `"xce_sched_fcfs"`. The picker runs in a dedicated thread with `jbuf` cbuf communication. No way to swap policies without recompilation. 2. **Parallel job allocation is a stub** — `parjob_allocator.c:my_alloc()` returns 0 with no logic. Jobs requiring multiple slots (`maxTasks > 1`) produce no allocation. 3. **Allocation is one-shot** — `sched_make_allocation()` tries the first matching host and stops. No mechanism to try alternative allocation plans (different host×slot combinations) when the first fails. 4. **No preemption** — when a high-priority job cannot be scheduled due to insufficient free resources, there is no mechanism to preempt lower-priority running jobs to free resources. -5. **No project-level scheduling** — `xce_sched_project_t` is just `{ char* name }`. Projects have no resource ownership, quota, or scheduling policy. Queue and project roles are conflated. +5. **No project-level scheduling** — `xce_sched_project_t` is just `{ char* name }`. Projects have no resource ownership, quota, or scheduling policy. +6. **Monolithic scheduler** — the scheduler is tightly coupled to controller I/O (capnp, `apictx`). No way to replay recorded events for debugging or test scheduling policies without a live cluster. -Operators need configurable scheduling policies at multiple levels, parallel job support, and preemption. The scheduler must generate multiple candidate allocation plans and try them in preference order. +Operators need configurable scheduling policies, parallel job support, preemption, and a way to debug/tune scheduling behavior without a live cluster. ## Current State @@ -21,36 +22,49 @@ Operators need configurable scheduling policies at multiple levels, parallel job - **Select expression AST** (`resreq.h`): full parser/evaluator with per-session memoization (`select_eval_ctx_t`) and inter-session GC. - **Shared resources** (`xce_scheduler_t.sharedInst`/`sharedInUse`): zarray of resource values tracked per scheduling session. - **Scheduling loop** (`scheduler.c:sched_allocator()`): pick job → `sched_make_allocation()` → pend or dispatch → next. +- **Controller integration** (`handler.c`): receives capnp push/notify → enqueues `xce_sched_update_request_t` → `sched_update()` dequeues. Decisions published via `sched->apictx`. ### What's missing -- Configurable job picker: the plugin name is a hardcoded string literal; a monolithic picker conflates inter-queue and intra-queue selection +- Configurable job picker: the plugin name is a hardcoded string literal - Parallel job allocation: no combinatorial plan generation, no multi-slot host matching - Iterator/lazy generation: allocation is eager one-shot, no retry with alternative plans -- Preemption: no mechanism to preempt lower-priority running jobs when a high-priority job cannot be scheduled -- Project-level scheduling: `xce_sched_project_t` is just `{ char* name }` — no resource ownership, quota, or scheduling policy +- Preemption: no mechanism to preempt lower-priority running jobs +- Project-level scheduling: `xce_sched_project_t` is just `{ char* name }` - Cross-job resreq optimization: no mechanism to skip already-failed resreq patterns within a session -- Picker composition: no way to assign different pickers to different queues or projects +- Scheduler simulation/debugging: no way to replay recorded events, no virtual clock, no deterministic mode +- Core/driver separation: scheduling logic is tightly coupled to controller I/O ## Desired Outcome -### Four-Level Scheduling Architecture +### Three Architectural Foundations -The scheduling loop is always `project → queue → job`, composing pickers at each level: +**1. Pluggable Job Picker** — the core scheduling loop calls `picker->next_job()` to get the next schedulable job, with zero knowledge of how jobs are selected. The default `builtin_fcfs` picker internally implements queue-priority ordering and FCFS job ordering, replicating today's behavior exactly. Per-queue picker overrides are supported. The picker runs synchronously in the core's scheduling thread — no dedicated picker thread, no `jbuf` cbuf. -| Level | Picker | Plugin slot | Default (v1) | -|-------|--------|-------------|---------------| -| 0 | Project picker | `sched->project_pick_plugin` | `builtin_flat` — single "default" project | -| 1 | Inter-queue picker | `sched->queue_pick_plugin` | `builtin_strict_priority` | -| 2 | Intra-queue picker | `queue→project→sched` chain | `builtin_fcfs` | -| 3 | Preemption policy | `queue->preempt_policy` | `lowest_priority_first` | +The picker plugin interface (`xce_job_picker_iface_t`): -1. **Unified picker loop**: A single scheduling loop that always follows `project → queue → job`. In v1 (flat project space), the project picker `builtin_flat` yields one "default" project containing all queues — identical to today's behavior. In v2 (future), the project picker becomes quota-aware and hierarchical, without changing the loop code. -2. **Configurable job selection at every level**: each picker slot is a plugin. Level 1 (inter-queue) picks which queue to serve next. Level 2 (intra-queue) picks which job within that queue, with per-queue customization via the `queue → project → global` precedence chain. -3. **Lazy allocation plan iterator**: `xce_alloc_plan_iter_t` — generates candidate (nhosts, slots_per_host) plans one at a time, sorted by preference. Consumer tries each plan until one succeeds or all fail. -4. **Lazy host candidate iterator**: for a given allocation plan, iterate candidate hosts filtered by select expression + resource availability. Composes with plan iterator. -5. **Parallel job combinatorial allocation**: `parjob_allocator` implements the plan iterator. For a job needing N slots: generate plans [1host×N, 2hosts×⌈N/2⌉, …, Nhhosts×1]. Each plan: collect hosts with enough slots, try each until success. -6. **Preemption**: when allocation fails for a high-priority job, select victim jobs from lower-priority queues (LSF-style per-queue `preemptible_queues` list), send SIGSTP via controller→worker pipeline, and retry allocation next round. -7. **Session-level unsatisfiable resreq cache**: if a primary resreq cannot be satisfied in the current scheduling session (all plans + preemption exhausted), fingerprint it. Skip subsequent jobs with the same fingerprint for the rest of the session. +| Category | Hooks | Purpose | +|----------|-------|---------| +| Lifecycle | `init`, `fini` | Setup and teardown | +| State-change | `on_queue_update`, `on_job_push`, `on_job_state_change`, `on_job_update` | Called by core when events arrive from driver | +| Session | `begin_session`, `next_job`, `end_session` | Scheduling round lifecycle | +| Post-allocation | `on_dispatch`, `on_pend` | Notification after allocation attempt | +| Optional | `on_config`, `on_job_rusage` | Advanced pickers (NULL if unused) | + +**2. Iterator-Driven Allocation** — lazy `xce_alloc_plan_iter_t` (candidate (nhosts, slots_per_host) plans, most-preferred first) composed with lazy `xce_host_iter_t` (candidate hosts for a given plan). `parjob_allocator` implements real combinatorial multi-slot allocation. Session-level unsatisfiable resreq fingerprint cache avoids re-evaluating already-proven-unsatisfiable resreqs. + +**3. Core/Driver Separation** — the scheduler core is a passive, event-driven engine with zero controller I/O dependencies. The driver connects it to the outside world: + +| Mode | Driver | Input | Output | +|------|--------|-------|--------| +| Normal | Controller-connected | capnp push/notify → core events | Core decisions → controller | +| Simulation | Replay file | JSONL event file → core events | Core decisions → log (with `--sim-verify` diff against recorded) | + +- **Discrete event-driven virtual clock**: jumps directly to next event timestamp, no fixed tick, monotonic +- **Snapshot + delta replay**: load state snapshot, replay only subsequent delta events +- **Deterministic guarantee**: same initial state + same events = same decisions +- **Runtime recording control**: xceadmin `scheduler record start/stop` commands +- **JSONL replay format**: one event per line, debuggable, plain text +- **What-if branching**: load snapshot, replay alternative delta events ### Queue vs Project — Roles @@ -59,10 +73,10 @@ The scheduling loop is always `project → queue → job`, composing pickers at | **Role** | Scheduling mechanism | Resource ownership | | **Question** | HOW are jobs ordered and constrained? | WHO owns resources and gets charged? | | **Scope** | One hardware/scheduling profile | Cross-queue, cross-cluster | -| **Key attributes** | Priority, limits, time windows, picker, preemption config | Quota, usage, hierarchy, members (future) | +| **Key attributes** | Priority, limits, time windows, per-queue picker override, preemption config | Quota, usage, hierarchy, members (future) | | **Cardinality** | 1 job → 1 queue, many-to-many | 1 job → 1 project, many-to-many | -One project submits to many queues (different hardware profiles). One queue receives from many projects (shared hardware). +One project submits to many queues (different hardware profiles). One queue receives from many projects (shared hardware). The picker plugin may use `queue->project_name` internally for project-scoped iteration (v2). ## Alternatives Considered @@ -71,237 +85,267 @@ One project submits to many queues (different hardware profiles). One queue rece | Aspect | Detail | |--------|--------| | **Job selection** | Add `job_pick_plugin` config field, same as chosen approach | -| **Parallel jobs** | Implement parjob allocator with pre-computed plan list. Eager generation — all plans materialized before first try | -| **Iterator** | No new abstraction. Simple for-loop over plan array, inner for-loop over hosts | -| **Shared resreq** | `xlist_t unsatisfiable_resreqs` in session state, same as chosen approach | +| **Parallel jobs** | Implement parjob allocator with pre-computed plan list. Eager generation | +| **Iterator** | No new abstraction. Simple for-loop over plan array | +| **Shared resreq** | `xlist_t unsatisfiable_resreqs` in session state | -**Rejected because:** Eager plan generation causes memory pressure for large combinatorial spaces (e.g., 64 slots on 128 hosts = thousands of plans). No reusable abstraction — each new allocator reimplements the loop. Short-term win, long-term rework cost. +**Rejected because:** Eager plan generation causes memory pressure for large combinatorial spaces. No reusable abstraction — each new allocator reimplements the loop. Short-term win, long-term rework cost. -### Approach B: Iterator-Driven Allocation Architecture ★ Chosen +### Approach B: Iterator-Driven Allocation + Picker Plugin ★ Chosen | Aspect | Detail | |--------|--------| -| **Job selection** | Configurable plugin name via `job_pick_plugin` field | +| **Job selection** | Pluggable `xce_job_picker_iface_t` with `next_job()`. Single `builtin_fcfs` default. Per-queue picker override. Synchronous, no dedicated thread. | | **Iterator abstraction** | `xce_alloc_plan_iter_t` + `xce_host_iter_t` — lazy, cancel-safe, composable | | **Parallel jobs** | Combinatorial plan generation via plan iterator: 1host×N → 2hosts×⌈N/2⌉ → … → Nhhosts×1 | | **Host iterator** | Per-plan lazy candidate host iteration using existing select expression eval | +| **Preemption** | `XCE_DECISION_PREEMPT` decision type, LSF-style cross-queue victim selection, SIGSTP via controller→worker | | **Shared resreq** | Session-level fingerprint cache: `{select, rusage, user, queue, project}` | +| **Core/driver split** | Passive event-driven core + dual-mode driver (normal/simulation) | +| **Simulation** | JSONL replay, snapshot + delta, discrete event-driven virtual clock, deterministic | -**Chosen because:** Lazy generation avoids memory pressure. Iterator composition matches the user's vision: plan iterator → host iterator → try alloc. Clean separation of concerns. Each iterator implementation is independently testable. +**Chosen because:** Lazy generation avoids memory pressure. Single `next_job()` interface makes pickers truly pluggable — the core loop never changes. Core/driver separation enables simulation mode for debugging/tuning without a live cluster. Iterator composition matches the user's vision: plan iterator → host iterator → try alloc. ### Approach C: Full Scheduler Framework (deferred) | Aspect | Detail | |--------|--------| -| **Job selection** | Policy chain — multiple plugins score/veto jobs. Composable: priority + fair-share + preemption | +| **Job selection** | Policy chain — multiple plugins score/veto jobs | | **Iterator** | Triple composition: job iterator → plan iterator → host iterator | -| **Resreq registry** | Named primary resreqs registered globally, referenced by name, reference-counted | -| **Allocation plugins** | Different strategies as plugins: greedy, bin-packing, round-robin, topology-aware | -| **Session state machine** | Formalized STAGING → ELECT → ALLOCATE → COMMIT with well-defined transitions | +| **Resreq registry** | Named primary resreqs registered globally, reference-counted | +| **Allocation plugins** | Different strategies as plugins: greedy, bin-packing, round-robin | +| **Session state machine** | Formalized STAGING → ELECT → ALLOCATE → COMMIT | -**Deferred (not rejected):** The policy chain and resreq registry are valuable but lack current demand. Approach B's iterator abstraction is designed to compose upward — the plan iterator and host iterator are building blocks that a future job iterator or policy chain can consume. The template registry can layer on top without breaking the iterator interfaces. +**Deferred (not rejected):** The policy chain and resreq registry are valuable but lack current demand. Approach B's picker interface is designed to compose upward — a future policy-chain picker implements the same `next_job()` interface. -### Decision rationale +### Decision Rationale -Approach B chosen over A because the iterator abstraction is a one-time design cost that pays off immediately (parjob combinatorial allocation needs it) and compounds (every future allocator reuses it). The four-level picker architecture (project → queue → job + preemption) extends Approach B with design elements from Approach C (policy composition, formalized level separation) that are needed NOW (per-queue pickers, preemption), while deferring the remaining Approach C layers (policy chains with scoring, resreq registry, formal state machine) until real use cases emerge. The iterator interfaces and picker slots are designed to compose upward when needed. +Approach B chosen over A because the iterator abstraction pays off immediately (parjob combinatorial allocation) and compounds (every future allocator reuses it). The picker plugin interface with `next_job()` keeps the core loop simple (5 lines) and makes pickers truly pluggable. Core/driver separation enables simulation mode — a capability that would be prohibitively expensive to retrofit later. -**Updated decision (2026-07-10):** The original Approach B treated the job picker as a single global plugin (`job_pick_plugin` on `xce_scheduler_t`). Design discussion identified that different queues/projects need different pickers, and that preemption is an essential missing mechanism. The architecture now specifies four composable levels (project, queue, job, preemption) with per-queue configuration, LSF-style cross-queue preemption, and a unified loop that works identically for v1 (flat projects) and v2 (hierarchical projects). The project picker level is deferred to a future spec but the architecture slot and interface contract are defined now. +**Design evolution (2026-07-10 → 2026-07-27):** The original design specified a four-level architecture with three separate builtin plugins (`builtin_flat`, `builtin_strict_priority`, `builtin_fcfs`) and a three-level `project→queue→job` loop hardcoded in the core. Analysis of the existing FCFS plugin (`fcfs.c`) showed it already encapsulates all picking logic internally. The architecture was simplified to a single `next_job()` plugin interface with one builtin picker (`builtin_fcfs`) — the three-level decomposition is now an internal implementation detail of the plugin, not the core loop. Core/driver separation was added (Req 10) to enable simulation mode for policy debugging and tuning. ## Approach -**Iterator-Driven Allocation Architecture with Four-Level Picker Composition** (extended from original Approach B): +**Iterator-Driven Allocation with Pluggable Picker + Core/Driver Separation**: -### Core abstractions - -``` -┌──────────────────────────────────────────────────────────┐ -│ Level 0: Project Picker [sched->project_pick_plugin] │ -│ │ -│ v1 (builtin_flat): yields one "default" project │ -│ v2 (future): quota-aware project selection │ -└──────────────────────┬───────────────────────────────────┘ - │ project scope - ▼ -┌──────────────────────────────────────────────────────────┐ -│ Level 1: Inter-Queue Picker [sched->queue_pick_plugin] │ -│ │ -│ Iterates queues scoped to the selected project │ -│ Default: strict_priority (descending queue->priority) │ -└──────────────────────┬───────────────────────────────────┘ - │ queue - ▼ -┌──────────────────────────────────────────────────────────┐ -│ Level 2: Intra-Queue Picker [queue→project→sched] │ -│ │ -│ Picks one job from the selected queue │ -│ Default: builtin_fcfs (priority desc, queue_time asc) │ -└──────────────────────┬───────────────────────────────────┘ - │ job - ▼ -┌──────────────────────────────────────────────────────────┐ -│ Allocation │ -│ │ -│ xce_alloc_plan_iter_t xce_host_iter_t │ -│ ┌─────────────────────┐ ┌──────────────────────┐ │ -│ │ init(resreq, sched) │ │ init(plan, workers) │ │ -│ │ next() → plan │───────▶│ next() → worker │ │ -│ │ fini() │ │ fini() │ │ -│ └─────────────────────┘ └──────────────────────┘ │ -│ │ -│ success → dispatch │ -│ fail → Level 3 (preemption) │ -└──────────────────────┬──────────────────────────────────┘ - │ fail - ▼ -┌──────────────────────────────────────────────────────────┐ -│ Level 3: Preemption │ -│ │ -│ if queue->preemptible_queues: │ -│ victims = preempt_policy.select_victims(job) │ -│ if victims: commit XCE_DECISION_PREEMPT │ -│ → controller → worker → SIGSTP victims │ -│ → victims → JOB_SUSPENDED, release resources │ -│ → pend job for next round │ -│ else: pend(job, "Resources") │ -│ else: pend(job, "Resources") │ -└──────────────────────────────────────────────────────────┘ -``` - -### Picker plugin interface - -Each picker level follows the same contract: -```c -typedef struct { - void* (*init)(xce_scheduler_t* sched, void* parent_scope); - void* (*next)(void* iter); // returns scope or NULL - void (*fini)(void* iter); -} picker_iface_t; -``` - -### Unified scheduling loop +### Core scheduling loop ```c void* sched_allocator(void* arg) { while (1) { - // Level 0: project scope - scope = project_picker.next(sched); - if (!scope) { sleep(1); continue; } + picker->begin_session(picker); - // Level 1: queue (scoped to project) - queue = queue_picker.next(sched, scope); - if (!queue) { project_picker.advance(); continue; } - - // Level 2: job (within queue) - // Precedence: queue->job_pick_plugin → project->job_pick_plugin → sched->job_pick_plugin - picker = resolve_job_picker(sched, queue); - job = picker->elect_one(queue); - - if (!job) { queue_picker.advance(); continue; } - - // Allocation + preemption - if (try_allocate(sched, job)) { - dispatch(sched, job); - } else if (can_preempt(sched, job)) { - preempt_and_pend(sched, job); - } else { - pend(sched, job, "Resources"); + xce_sched_job_t* job; + while ((job = picker->next_job(picker)) != NULL) { + if (try_allocate(job) > 0) { + picker->on_dispatch(picker, job->jobid); + emit_decision(DISPATCH, job); + } else if (can_preempt(job)) { + emit_decision(PREEMPT, job, victims); + picker->on_pend(picker, job->jobid); + } else { + emit_decision(PEND, job); + picker->on_pend(picker, job->jobid); + } } + + picker->end_session(picker); + sleep(1); } } ``` -This loop is identical for v1 and v2. v1 uses `builtin_flat` for Level 0. v2 replaces it with a quota-aware project picker. +The core loop has zero knowledge of project/queue/job ordering — all selection logic lives behind `next_job()`. + +### Picker plugin interface + +```c +typedef struct xce_job_picker { + // Lifecycle + int (*init)(void* picker, xce_sched_core_t* core); + void (*fini)(void* picker); + + // State-change hooks (called by core when events arrive) + int (*on_queue_update)(void* picker, xce_sched_queue_t* queue); + int (*on_job_push)(void* picker, xce_sched_job_t* job); + int (*on_job_state_change)(void* picker, xce_sched_job_t* job, uint32_t state); + int (*on_job_update)(void* picker, xce_sched_job_t* job); + + // Session lifecycle + int (*begin_session)(void* picker); + int (*end_session)(void* picker); + + // Job selection + xce_sched_job_t* (*next_job)(void* picker); + + // Post-allocation notification + int (*on_dispatch)(void* picker, uint64_t jobid); + int (*on_pend)(void* picker, uint64_t jobid); + + // Optional hooks (NULL = not implemented) + int (*on_config)(void* picker, xce_conf4sched_t* config); + int (*on_job_rusage)(void* picker, xce_sched_job_t* job, xce_job_rusages_t* rusages); +} xce_job_picker_iface_t; +``` + +### builtin_fcfs internal design + +The default picker internally implements the equivalent of today's selection: + +``` +builtin_fcfs.next_job(): + Iterate queues by priority (descending) + Skip queues with no ready jobs + For each queue: + If queue has per-queue picker override: + Delegate to that picker + Else: + Iterate jobs by priority desc, queue_time asc (FCFS) + Skip jobs not ready + Return first ready job + Return NULL if all queues exhausted +``` + +This is an implementation detail of the plugin, not visible to the core loop. ### Preemption flow ``` scheduler controller worker ─────────── ────────── ────── -preempt_policy.select_victims(J) +alloc fails for high-prio job J + +preempt_policy.select_victims(J): + collect running jobs from + Q_aggressor.preemptible_queues + filter: victim.prio < J.prio + filter: victim.queue.preemptible + rank: lowest priority first + select minimum set satisfying J.resreq + → [victim1, victim2] -XCE_DECISION_PREEMPT ────────────▶ handle_job_preempt() ──────▶ SIGSTP victim - .victim_jobids[] deliver to each job → JOB_SUSPENDED - .signal = SIGSTP victim's worker release resources +XCE_DECISION_PREEMPT ────────────▶ handle_job_preempt() ──────▶ SIGSTP victim1 + .victim_jobids = [v1, v2] deliver to each job → JOB_SUSPENDED + .signal = SIGSTP victim's worker release resources .preempting_jobid = J J pended → next round → retry alloc ``` -V1 uses SIGSTP (terminal stop — process groups paused, job stays in queue). Future escalation to SIGKILL kill-and-requeue is deferred. +### Core/Driver Architecture + +``` +┌──────────────────────────────────────────────────────────────┐ +│ DRIVER LAYER │ +│ │ +│ Normal Mode Simulation Mode │ +│ controller capnp ──┐ replay.jsonl ──┐ │ +│ handler → events │ virtual clock │ │ +│ → publish decisions│ → record/log │ │ +│ │ ▲ │ │ ▲ │ │ +└───────┼───────┼─────┴──────────────┼───────┼───┴──────────────┘ + │ │ decisions │ │ decisions + │ │ (callback) │ │ (callback) + ▼ │ ▼ │ +┌──────────────────────────────────────────────────────────────┐ +│ SCHEDULER CORE │ +│ │ +│ core_push_event() → picker hooks → picker->next_job() │ +│ → try_allocate() → DISPATCH / PREEMPT / PEND │ +│ │ +│ ZERO dependencies on: controller, capnp, network, wall-clock │ +└──────────────────────────────────────────────────────────────┘ +``` ### What stays unchanged -- Existing plugin hooks (config, queue, job, worker, state_change, commit, election, prepare_allocation, rusage) — all preserved +- Existing plugin hooks (config, queue, job, worker, state_change, commit, election, prepare_allocation, rusage) — preserved, but the picker no longer uses the dedicated `job_elect_fn` thread - `seqjob_allocator` — wrapped with iterator interface, internally still 1host×1slot - Select expression system — no changes - COMPOUND and ALTER resreq types — unchanged (PRIMARY focus) -- Controller communication (handler.c opcodes, decision cbuf) — extended, not replaced +- Controller communication (handler.c opcodes, decision cbuf in driver) — extended, not replaced - `HOOK_DETAIL_JOB_STOP` — reused for preemption stop notifications ### What's new -- `XCE_DECISION_PREEMPT` decision type -- `xce_preempt_decision_t` payload -- Three builtin plugins: `builtin_flat`, `builtin_strict_priority`, `builtin_fcfs` +- `xce_job_picker_iface_t` — pluggable picker interface with full hook specification +- `xce_alloc_plan_iter_t` + `xce_host_iter_t` — lazy iterator abstractions +- `XCE_DECISION_PREEMPT` decision type + `xce_preempt_decision_t` payload +- `builtin_fcfs` — single builtin picker (replaces three separate builtins from original design) +- `xce_sched_core_t` / `xce_sched_driver_t` / `xce_sched_sim_driver_t` — core/driver struct split +- `xce_core_event_t` — typed event interface between driver and core +- `xce_core_decision_cb_t` — decision callback (core → driver) +- JSONL replay file format + snapshot/restore +- Discrete event-driven virtual clock - `project_name` on queue structs -- `job_pick_plugin` on queue + project structs +- `job_pick_plugin` on scheduler + queue structs (per-queue override) - `preemptible_queues`, `preemptible`, `preempt_policy` on queue struct -- `project_pick_plugin`, `queue_pick_plugin`, `job_pick_plugin` on scheduler struct ## Scope ### In -- Unified picker loop: `project → queue → job` with plugin slots at each level -- Three builtin plugins: `builtin_flat` (Level 0), `builtin_strict_priority` (Level 1), `builtin_fcfs` (Level 2) -- Picker plugin interface: `init/next/fini` — cancel-safe, session-aware -- Picker precedence chain: `queue → project → global` -- `xce_alloc_plan_iter_t` interface (header + implementation) -- `xce_host_iter_t` interface (header + implementation) +- Pluggable job picker interface (`xce_job_picker_iface_t` with `next_job()`) hiding all selection logic +- Single builtin picker (`builtin_fcfs`) replicating today's behavior +- Configurable picker plugin with per-queue override (`queue->job_pick_plugin`) +- Picker hook specification: lifecycle, state-change, session, post-allocation, optional hooks +- `xce_alloc_plan_iter_t` + `xce_host_iter_t` interfaces (lazy, cancel-safe, composable) - `parjob_allocator` combinatorial plan generation (1host×N, 2hosts×⌈N/2⌉, …, Nhhosts×1) -- Preemption: `XCE_DECISION_PREEMPT` decision type, `xce_preempt_decision_t` payload, LSF-style cross-queue victim selection, SIGSTP mechanism via controller→worker pipeline +- Preemption: `XCE_DECISION_PREEMPT` decision type, LSF-style cross-queue victim selection, SIGSTP mechanism - Per-queue preemption config: `preemptible_queues`, `preemptible`, `preempt_policy` - Session-level unsatisfiable resreq fingerprint cache -- Data structure changes to `xce_scheduler_t`, `xce_sched_queue_t`, `xce_sched_project_t`, `decision.h` -- Plugin interface contract documentation (cancel-safe, session-aware) -- Unit tests for plan generation, host iteration, cache hit/miss, picker resolution, preemption victim selection +- Core/driver separation: passive event-driven core, normal-mode driver, simulation-mode driver +- Discrete event-driven virtual clock (monotonic, jumps to next event timestamp) +- Runtime recording control via xceadmin commands (`scheduler record start/stop`) +- JSONL replay file format (HEADER + SNAPSHOT + events + DECISIONS) +- State snapshot/restore for replay efficiency +- Deterministic replay guarantee for debugging/tuning +- What-if branching (load snapshot, replay alternative delta events) +- Data structure changes: `xce_scheduler_t`, `xce_sched_queue_t`, `xce_sched_project_t`, `decision.h`, `xce_sched_core_t`, `xce_sched_driver_t`, `xce_sched_sim_driver_t`, `xce_core_event_t`, `xce_job_picker_iface_t` +- Picker plugin interface contract documentation +- Unit tests: plan generation, host iteration, cache hit/miss, picker hook behavior, preemption victim selection, event recording/replay, snapshot/restore, deterministic replay - Integration test: multi-slot parallel job allocation and preemption flow end-to-end ### Out -- New job selection policy implementations beyond the three builtins (priority, fair-share, deadline, preemption, backfill, etc.) — the configurable slots enable them, but none ship in this spec -- Hierarchical project resource quotas (Level 0 full) — deferred to `project-resource-ownership` spec -- Resreq template registry (named/shared resreq objects) — future enhancement +- New job selection policies beyond the builtin FCFS picker — the pluggable interface enables them, but none ship here +- Hierarchical project resource quotas — deferred to `project-resource-ownership` spec +- Resreq template registry — future enhancement - Select expression language changes -- Controller-side scheduling state replication (separate concern: commit barrier wiring, see roadmap hardening item) +- Controller-side scheduling state replication (commit barrier wiring) - Compound/ALTER resreq allocation changes - GPU/affinity-aware allocation (pluggable later via allocator plugins) -- Kill-and-requeue preemption escalation (v1 is SIGSTP only, suspend-and-retry) -- Deadline field on `xce_sched_job_t` (needed for deadline-based pickers — deferred) +- Kill-and-requeue preemption escalation (v1 is SIGSTP only) +- Deadline field on `xce_sched_job_t` +- Event payload JSON schema (open design question — deferred to design phase) +- Distributed/cluster-mode simulation (v1 is single-scheduler replay only) ## Future: Project Resource Ownership Deferred to a separate `project-resource-ownership` spec. When implemented: - Projects form a tree with resource quota at each node -- Level 0 project picker selects which project gets resources (fair-share, priority, proportional) -- Level 1 queue picker is scoped to the selected project's queues -- Level 2 job picker sees only jobs from the selected project within each queue -- Project quota enforcement: projects at or over quota are skipped by Level 0 -- The unified picker loop (above) requires zero code changes — only a new project picker plugin replaces `builtin_flat` +- A project-aware picker plugin selects which project gets resources, then iterates queues scoped to that project, then jobs within each queue +- Project quota enforcement: projects over quota are skipped by the picker +- The core scheduling loop requires zero code changes — only a new picker plugin replaces `builtin_fcfs` +- `queue->project_name` (added here) provides the queue→project mapping the v2 picker consumes +- `xce_sched_project_t` scaffolding (added here) provides the struct the v2 picker extends -The architecture is designed so that v1 (flat project space) and v2 (hierarchical projects) share the identical scheduling loop. +The architecture is designed so that v1 (flat, `builtin_fcfs` ignores projects) and v2 (hierarchical, project-aware picker) share the identical core scheduling loop. ## Boundary Candidates The work naturally splits into these implementation phases (single spec, sequential): -1. **Unified picker loop + builtin plugins** — implement the `project → queue → job` loop with `builtin_flat`, `builtin_strict_priority`, `builtin_fcfs`; retire `sched_job_picker()`; add plugin slots and precedence chain to structs -2. **Iterator interfaces** — define `xce_alloc_plan_iter_t` and `xce_host_iter_t`, implement for seqjob path first (trivial wrapper), validate the abstraction -3. **Parallel job allocator** — implement combinatorial plan generation in `parjob_allocator`, wire through host iterator -4. **Preemption** — implement `XCE_DECISION_PREEMPT` decision type, cross-queue victim selection policy, SIGSTP pipeline (scheduler→controller→worker), queue preemption config fields -5. **Unsatisfiable resreq cache** — session-level fingerprint cache, wire into scheduling loop (skip before allocation + preemption attempt) -6. **Integration + testing** — end-to-end multi-slot parallel job allocation, preemption flow, picker resolution, cache behavior, HA soak regression +1. **Core/driver separation** — split `xce_scheduler_t` into `xce_sched_core_t` + `xce_sched_driver_t`; define `xce_core_event_t` and `xce_core_decision_cb_t`; implement passive event-driven core interface; wire normal-mode driver to existing handler.c +2. **Picker plugin interface + builtin_fcfs** — define `xce_job_picker_iface_t`; implement `builtin_fcfs` with all MUST/SHOULD hooks; retire dedicated picker thread + `jbuf`; make core loop call `next_job()` synchronously; add `job_pick_plugin` config with per-queue override +3. **Iterator interfaces** — define `xce_alloc_plan_iter_t` and `xce_host_iter_t`, implement for seqjob path first (trivial wrapper), validate the abstraction +4. **Parallel job allocator** — implement combinatorial plan generation in `parjob_allocator`, wire through host iterator +5. **Preemption** — implement `XCE_DECISION_PREEMPT` decision type, cross-queue victim selection policy, SIGSTP pipeline, queue preemption config fields +6. **Unsatisfiable resreq cache** — session-level fingerprint cache, wire into scheduling loop +7. **Simulation driver** — implement simulation-mode driver with JSONL replay, virtual clock, snapshot/restore, deterministic verification +8. **Recording + xceadmin commands** — implement runtime recording control, periodic snapshots during recording +9. **Integration + testing** — end-to-end multi-slot parallel job allocation, preemption flow, picker resolution, cache behavior, simulation replay, HA soak regression ## Out of Boundary -- New job selection policy implementations (priority, fair-share, etc.) — these are new plugins that USE the configurable picker, not part of this spec +- New job selection policy implementations (priority, fair-share, etc.) — these are new plugins that implement `xce_job_picker_iface_t` - Resreq template sharing across jobs (future: `resreq_registry` spec) - Commit barrier wiring for scheduler decisions (separate hardening item in roadmap) - Controller-side changes (the scheduler runs independently, receives updates via existing opcodes) @@ -312,10 +356,11 @@ The work naturally splits into these implementation phases (single spec, sequent - Existing plugin framework (`plugin.h`, `plugin.c`) — NO changes needed - Existing select expression evaluator (`resreq.h` eval/Gc) — NO changes needed - Existing shared resource tracking (`sharedInst`/`sharedInUse`) — NO changes needed -- Existing scheduler data structures (`xce_scheduler_t`, `xce_sched_ctx_t`) — minimal additions +- Existing scheduler data structures (`xce_scheduler_t`, `xce_sched_ctx_t`) — split, not replaced ### Downstream (future consumers) -- **New job selection policies** — priority, fair-share, preemption plugins register via the configurable picker +- **New job selection policies** — priority, fair-share, deadline, backfill plugins implement `xce_job_picker_iface_t` +- **Project-resource-ownership** — project-aware picker plugin consumes `queue->project_name` and `xce_sched_project_t` - **Affinity/GPU allocators** — register as allocator plugins, implement plan iterator for topology-aware placement - **Commit barrier wiring** — scheduling decisions flow through majority commit (separate hardening item) - **Resreq template registry** — named resreqs shared across jobs, reference-counted @@ -323,7 +368,7 @@ The work naturally splits into these implementation phases (single spec, sequent ## Existing Spec Touchpoints ### Extends -- **scheduler-controller-msg-gap** — adjacent (message handling). The framework enhancement operates on the same `xce_scheduler_t` state. No conflicts; the msg-gap spec fills handler gaps this spec reads from. +- **scheduler-controller-msg-gap** — adjacent (message handling). The framework enhancement operates on the same scheduling state. No conflicts; the msg-gap spec fills handler gaps this spec reads from. ### Adjacent - **ha-consistency-invariants** — commit barrier that scheduling decisions will eventually flow through. This spec does NOT wire the barrier; it only makes allocation decisions that the barrier WILL consume. @@ -332,7 +377,8 @@ The work naturally splits into these implementation phases (single spec, sequent ## Constraints - **C (gnu17)** — no C++, no external libraries beyond existing (capnp, zlib, pthreads) - **Non-blocking in plugin hooks** — allocation happens on allocator thread, not iomgr. No new blocking concerns. -- **Cancel-safe** — job picker thread is `pthread_cancel`-able. Iterator `next()` calls must have cancellation points. -- **Session isolation** — iterator state and resreq cache are per-session, cleared on `begin_session`. +- **Cancel-safe** — `next_job()` must have `pthread_cancel` cancellation points +- **Session isolation** — iterator state and resreq cache are per-session, cleared on `begin_session` - **Backward compatible** — existing FCFS + seqjob behavior unchanged. New functionality is additive. +- **Deterministic replay** — same initial state + same event sequence → same decisions. No wall-clock time, no unseeded randomness, stable iteration order. - **Memory** — lazy generation avoids materializing all combinations. Worst-case for a job needing N slots on M hosts: M×N candidate evaluations (acceptably bounded). diff --git a/.kiro/specs/scheduler-framework/requirements.md b/.kiro/specs/scheduler-framework/requirements.md index 06e9b5d..891c628 100644 --- a/.kiro/specs/scheduler-framework/requirements.md +++ b/.kiro/specs/scheduler-framework/requirements.md @@ -4,18 +4,13 @@ The XCE scheduler has a plugin architecture (`plugin.h`/`plugin.c`, `xce_sched_plugin_t`) but three gaps keep it from being a real framework. First, job selection policy is hardcoded: `sched_job_picker()` (`scheduler.c:39`) sets `job_pick_plugin = "xce_sched_fcfs"` as a literal, so swapping policies requires recompilation. Second, parallel job allocation is a stub: `parjob_allocator.c:73`'s `my_alloc()` takes `(plugin, ctx)` and immediately `return 0` — any job with `maxTasks > 1` (routed there by `sched_make_primary_alloc_()` at `scheduler.c:93-103`) produces no allocation at all. Third, allocation is eager and one-shot: the sibling `seqjob_allocator.c:107` `my_alloc()` (used when `maxTasks == 1`) calls `sched_collect_workers()` then `xlist_find()` for the first host that satisfies the request and stops — there is no mechanism to generate alternative host/slot combinations and retry when the first plan fails. -This feature closes all three gaps with an iterator-driven allocation architecture: a lazy `xce_alloc_plan_iter_t` (candidate `(nhosts, slots_per_host)` plans, most-preferred first) composed with a lazy `xce_host_iter_t` (candidate hosts for a given plan, filtered by the existing select-expression evaluator), a `parjob_allocator` implementation that walks the plan iterator to do real combinatorial multi-slot allocation, and a session-scoped unsatisfiable-resreq fingerprint cache so a job whose resreq no plan can satisfy doesn't re-pay full allocation cost for every later job with the same fingerprint in the same scheduling session. +This feature closes all three gaps and adds two architectural foundations: -Beyond the three gaps, this feature introduces a **four-level scheduling architecture** that separates concerns cleanly and composes upward: +**Allocation**: A lazy `xce_alloc_plan_iter_t` (candidate `(nhosts, slots_per_host)` plans, most-preferred first) composed with a lazy `xce_host_iter_t` (candidate hosts for a given plan, filtered by the existing select-expression evaluator), a `parjob_allocator` implementation that walks the plan iterator to do real combinatorial multi-slot allocation, and a session-scoped unsatisfiable-resreq fingerprint cache so a job whose resreq no plan can satisfy doesn't re-pay full allocation cost for every later job with the same fingerprint in the same scheduling session. -| Level | Picker | Question it answers | Plugin slot | Default (v1) | -|-------|--------|---------------------|-------------|---------------| -| 0 | Project picker | WHO gets resources this round? | `sched->project_pick_plugin` | `"builtin_flat"` — single "default" project | -| 1 | Inter-queue picker | WHICH queue within the project? | `sched->queue_pick_plugin` | `"builtin_strict_priority"` | -| 2 | Intra-queue picker | WHICH job from this queue? | `queue→project→sched` precedence chain | `"builtin_fcfs"` | -| 3 | Preemption policy | WHAT to preempt when allocation fails? | `queue->preempt_policy` | `"lowest_priority_first"` | +**Job picking**: A pluggable `xce_job_picker_iface_t` — the core scheduling loop calls `picker->next_job()` to get the next schedulable job, with zero knowledge of how jobs are selected (FCFS, priority, fair-share, deadline, etc.). The default `builtin_fcfs` picker internally implements queue-priority ordering and FCFS job ordering, replicating today's behavior exactly. Per-queue picker overrides are supported. Preemption fires at Level 3 when allocation fails for a preemptible job. -The scheduling loop is always `project → queue → job`, with Level 0 collapsing to a single implicit "default" project in v1 and expanding to hierarchical resource ownership in a future spec (`project-resource-ownership`). Level 3 (preemption) fires only when allocation fails for a preemptible job. +**Core/driver separation**: The scheduler core is a passive, event-driven engine with zero controller I/O dependencies. A normal-mode driver connects it to a live controller; a simulation-mode driver replays recorded cluster events through a discrete event-driven virtual clock, enabling policy debugging, tuning, regression testing, and what-if analysis without a live cluster. > Full discovery context (problem, current state, alternatives considered, approach, boundary, upstream/downstream) is in `.kiro/specs/scheduler-framework/brief.md`. @@ -32,30 +27,223 @@ These are fundamentally different concerns: | **Cardinality to job** | 1 job → 1 queue | 1 job → 1 project | | **Cardinality to each other** | Many-to-many | Many-to-many | -- **Queue** = submission channel with scheduling policy. Owns resource thresholds (RUNLIMIT, MAX_RUNNING), time windows, inter-queue priority, and the intra-queue job picker. -- **Project** = resource ownership boundary. Owns quota, consumption tracking, hierarchical nesting, and accounting. One project submits to many queues; one queue receives from many projects. +- **Queue** = submission channel with scheduling policy. Owns resource thresholds (RUNLIMIT, MAX_RUNNING), time windows, priority (for inter-queue ordering within the picker), per-queue picker override, and preemption config. +- **Project** = resource ownership boundary. Owns quota, consumption tracking, hierarchical nesting, and accounting. One project submits to many queues; one queue receives from many projects. The picker plugin may use `queue->project_name` internally for project-scoped iteration (v2). ## Boundary Context -- **In scope**: Unified picker loop (`project → queue → job`) with plugin slots at each level; `xce_alloc_plan_iter_t` and `xce_host_iter_t` interfaces (lazy, cancel-safe, composable); `seqjob_allocator` rewrapped onto the iterator interface as a trivial 1-plan/1-host-loop case (behavior unchanged, `maxTasks == 1` only); `parjob_allocator`'s `my_alloc()` implementing real combinatorial plan generation (1host×N, 2hosts×⌈N/2⌉, …, Nhosts×1) for `maxTasks > 1`; three builtin plugins (`builtin_flat`, `builtin_strict_priority`, `builtin_fcfs`) replicating today's behavior through the new architecture; configurable picker slots with precedence chain (`queue → project → global`); preemption decision type (`XCE_DECISION_PREEMPT`) flowing scheduler→controller→worker with SIGSTP mechanism; cross-queue victim selection (LSF-style per-queue `preemptible_queues` list); session-level unsatisfiable-resreq fingerprint cache keyed on `{select, rusage, user, queue, project}`; documentation of plugin interface contracts (cancel-safe, session-aware); unit tests for plan generation, host iteration, cache hit/miss, picker resolution, preemption victim selection; integration test for end-to-end multi-slot parallel job allocation and preemption flow. +- **In scope**: Pluggable job picker interface (`xce_job_picker_iface_t` with `next_job()`) hiding all selection logic behind a single plugin; `xce_alloc_plan_iter_t` and `xce_host_iter_t` interfaces (lazy, cancel-safe, composable); `seqjob_allocator` rewrapped onto the iterator interface as a trivial 1-plan/1-host-loop case (behavior unchanged, `maxTasks == 1` only); `parjob_allocator`'s `my_alloc()` implementing real combinatorial plan generation (1host×N, 2hosts×⌈N/2⌉, …, Nhosts×1) for `maxTasks > 1`; single builtin picker (`builtin_fcfs`) replicating today's behavior through the new interface; configurable picker plugin with per-queue override (`queue->job_pick_plugin`); preemption decision type (`XCE_DECISION_PREEMPT`) flowing scheduler→controller→worker with SIGSTP mechanism; cross-queue victim selection (LSF-style per-queue `preemptible_queues` list); session-level unsatisfiable-resreq fingerprint cache keyed on `{select, rusage, user, queue, project}`; **core/driver separation** with passive event-driven core interface, normal-mode driver (controller-connected), simulation-mode driver (replay recorded events with discrete event-driven virtual clock), runtime recording control via xceadmin commands, JSONL replay file format, state snapshot/restore for replay efficiency, and deterministic replay guarantee for debugging/tuning; documentation of picker plugin interface contract (hooks, cancel-safe, session-aware); unit tests for plan generation, host iteration, cache hit/miss, picker hook behavior, preemption victim selection, **event recording/replay, snapshot/restore, and deterministic replay**; integration test for end-to-end multi-slot parallel job allocation and preemption flow. -- **Out of scope**: New job selection policies beyond the three builtins (priority, fair-share, deadline, preemption, backfill) — the configurable slots enable them, but none ship in this spec beyond the builtins; a resreq template registry (named/shared resreq objects); changes to the select-expression language or evaluator; controller-side scheduling-state replication / commit-barrier wiring for scheduling decisions (separate roadmap hardening item, tracked adjacent to `ha-consistency-invariants`); `COMPOUND`/`ALTER` resreq allocation changes beyond what composing over `PRIMARY` already provides; GPU/topology/affinity-aware allocation (left pluggable via future allocator plugins); hierarchical project resource quotas (Level 0 full — deferred to `project-resource-ownership` spec); kill-and-requeue preemption escalation (deferred — v1 is SIGSTP only); deadline field on `xce_sched_job_t` (deferred — needed for deadline-based pickers). +- **Out of scope**: New job selection policies beyond the builtin FCFS picker (priority, fair-share, deadline, backfill) — the pluggable picker interface enables them, but none ship in this spec beyond `builtin_fcfs`; a resreq template registry (named/shared resreq objects); changes to the select-expression language or evaluator; controller-side scheduling-state replication / commit-barrier wiring for scheduling decisions (separate roadmap hardening item, tracked adjacent to `ha-consistency-invariants`); `COMPOUND`/`ALTER` resreq allocation changes beyond what composing over `PRIMARY` already provides; GPU/topology/affinity-aware allocation (left pluggable via future allocator plugins); hierarchical project resource quotas (deferred to `project-resource-ownership` spec — only `project_name` on queue and `xce_sched_project_t` scaffolding ship here); kill-and-requeue preemption escalation (deferred — v1 is SIGSTP only); deadline field on `xce_sched_job_t` (deferred — needed for deadline-based pickers); **event payload JSON schema** (open design question — deferred to design phase); **distributed/cluster-mode simulation** (v1 is single-scheduler replay only). - **Adjacent expectations**: depends on the existing plugin framework (`plugin.h`/`plugin.c`), the existing select-expression evaluator (`resreq.h`, memoized via `select_eval_ctx_t`), and existing shared-resource tracking (`xce_scheduler_t.sharedInst`/`sharedInUse`) — none of these change. `scheduler-controller-msg-gap` (implemented) governs controller↔scheduler message handling this feature reads state through but does not modify. `ha-consistency-invariants`' commit barrier is a future consumer of scheduling decisions; this feature does not wire it. Controller hook `HOOK_DETAIL_JOB_STOP` (enum value 65 in `cluster_def.h`) already exists and is reused for preemption stop actions. +## Allocation Architecture (Reqs 2–4) + +Requirements 2, 3, and 4 form a three-layer allocation architecture. These layers compose according to the job's resource request type (PRIMARY, COMPOUND, or ALTER): + +### Resreq Type Hierarchy + +``` +ALTER → OR-of-compounds: first compound that fully allocates wins + └─ COMPOUND → AND-of-primaries: ALL primaries must allocate for success + └─ PRIMARY → plan_iter → host_iter → try_alloc (leaf level) +``` + +The iterator composition (`xce_alloc_plan_iter_t` + `xce_host_iter_t`) operates at the **PRIMARY leaf**. COMPOUND and ALTER are composition rules above the iterators — they call into the same primary allocator, unchanged from today's `sched_make_compound_allocation()` and `sched_make_alter_allocation()` dispatch. + +### Iterator Composition (PRIMARY leaf) + +``` + ┌──────────────────────────┐ + │ xce_alloc_plan_iter_t │ Req 2 + │ │ + │ init(primary_resreq) │ + │ next() → plan │ generates (nhosts, slots_per_host) + │ fini() │ candidates, most-preferred first + └────────────┬───────────────┘ + │ plan + ▼ + ┌──────────────────────────┐ + │ xce_host_iter_t │ Req 3 + │ │ + │ init(plan, workers) │ for a given plan, iterate + │ next() → worker │ candidate hosts matching + │ fini() │ select expression + availability + └────────────┬───────────────┘ + │ worker + ▼ + ┌──────────────────────────┐ + │ try_alloc(worker, plan) │ Req 4 (parjob) or + │ │ existing seqjob logic + │ check slots, shared res, │ + │ commit or advance │ + └────────────────────────────┘ +``` + +### Composition Algorithm (All Three Types) + +```c +// === PRIMARY leaf: iterator composition === +// Returns >0 on success, 0 on failure +int allocate_primary(sched, primary_resreq, ctx) { + plan_iter = plan_iter_init(primary_resreq, sched); + while ((plan = plan_iter->next(plan_iter)) != NULL) { + host_iter = host_iter_init(plan, sched->workers); + while ((worker = host_iter->next(host_iter)) != NULL) { + if (try_alloc_on_host(worker, plan, ctx) > 0) { + host_iter->fini(host_iter); + plan_iter->fini(plan_iter); + return ALLOC_SUCCESS; + } + } + host_iter->fini(host_iter); + } + plan_iter->fini(plan_iter); + return ALLOC_FAIL; +} + +// === COMPOUND: AND of primaries === +// ALL primaries must allocate. On any failure, roll back prior allocations +// and return failure. Same logic as today's sched_make_compound_allocation(). +int allocate_compound(sched, compound_resreq, ctx) { + for (int i = 0; i < compound_resreq->primaries.count; i++) { + primary = compound_resreq->primaries[i]; + if (allocate_primary(sched, primary, ctx) <= 0) { + // Roll back all primaries allocated so far in this compound + rollback_compound_allocations(ctx, i); + return ALLOC_FAIL; + } + } + return ALLOC_SUCCESS; +} + +// === ALTER: OR of compounds === +// First compound that fully allocates wins. Same logic as today's +// sched_make_alter_allocation(). On failure, no rollback needed +// (prior compounds were never committed — they failed their own checks). +int allocate_alter(sched, alter_resreq, ctx) { + for (int i = 0; i < alter_resreq->compounds.count; i++) { + compound = alter_resreq->compounds[i]; + if (allocate_compound(sched, compound, ctx) > 0) { + return ALLOC_SUCCESS; + } + // This compound failed — advance to next alternative + } + return ALLOC_FAIL; +} + +// === Top-level dispatch === +// Unchanged from today's sched_make_allocation() dispatch on obj->tag. +int allocate_job(sched, job, ctx) { + switch (job->resreq_type) { + case PRIMARY: + return allocate_primary(sched, job->primary_resreq, ctx); + case COMPOUND: + return allocate_compound(sched, job->compound_resreq, ctx); + case ALTER: + return allocate_alter(sched, job->alter_resreq, ctx); + } +} +``` + +**COMPOUND rollback note:** If primaries 1 and 2 of a compound allocate but primary 3 fails, primaries 1 and 2 must be rolled back — the compound is atomic. Today this is handled by `sched_make_compound_allocation()` tracking allocations in `ctx` and cleaning up on failure. This behavior is unchanged; the iterator interfaces don't alter the rollback contract. + +### Who Uses This Composition + +| Allocator | `maxTasks` | Plan iterator | Host iterator | Behavior | +|-----------|------------|---------------|---------------|----------| +| `seqjob_allocator` | `== 1` | Trivial: single plan (1 host × 1 slot) | Full: filters hosts by select expression | Unchanged from today — first matching host wins | +| `parjob_allocator` | `> 1` | Full combinatorial: 1host×N, 2hosts×⌈N/2⌉, …, Nhosts×1 | Full: filters hosts with enough available slots | New — walks plans until one succeeds | +| Future allocators | any | Custom strategy (e.g., topology-aware, bin-packing) | Reuses same `xce_host_iter_t` | Pluggable via `job_alloc_fn` | + +### Key Design Properties + +- **Lazy**: `plan_iter->next()` generates one plan at a time. `host_iter->next()` returns one host at a time. No full materialization. +- **Cancel-safe**: both `next()` calls have `pthread_cancel` cancellation points. +- **Independent lifecycles**: a `host_iter` is created from a plan, used, and destroyed; the `plan_iter` is advanced to the next plan only after the `host_iter` is done. `fini()` on one does not affect the other. +- **COMPOUND/ALTER unchanged**: the composition rules above the PRIMARY leaf (AND for compound, OR for alter) are unchanged from today. The iterator interfaces only change what happens inside `allocate_primary()`. +- **seqjob rewrap**: `seqjob_allocator` is rewrapped onto the iterator interfaces as a trivial case — its plan iterator always returns the single plan (1 host × 1 slot), and the inner loop is identical to today's first-match logic. This validates the abstraction before applying it to the complex parjob case. + ## Requirements -### Requirement 1: Unified picker loop (project → queue → job) +### Requirement 1: Pluggable job picker interface -**Objective:** As a maintainer of the scheduler, I want a single scheduling loop that composes project, queue, and job pickers in a fixed order, so that v1 (flat project space) and v2 (hierarchical projects with resource quotas) share the same code path. +**Objective:** As a maintainer of the scheduler, I want the core scheduling loop to call a single `next_job()` plugin interface with no knowledge of how jobs are selected, so that picking strategies (FCFS, priority, fair-share, deadline, etc.) are truly pluggable and the core loop never changes regardless of the picking algorithm. #### Acceptance Criteria -1. The Scheduler shall implement a scheduling loop that always follows the order: Level 0 (project picker) → Level 1 (inter-queue picker) → Level 2 (intra-queue picker) → allocation. -2. Each picker level shall conform to a common interface contract: `init(sched, parent_scope)`, `next(iter) → scope_or_NULL`, `fini(iter)`. -3. When a picker at any level returns NULL (exhausted), the loop shall advance the parent picker to its next scope and restart the child picker from that new scope. -4. In v1 (no project hierarchy), the default project picker `builtin_flat` shall yield exactly one scope: a "default" project containing all configured queues, so the loop behavior is identical to today's flat queue iteration. -5. Plugin resolution for Level 2 shall follow the precedence chain: `queue->job_pick_plugin` → `project->job_pick_plugin` → `sched->job_pick_plugin` → hardcoded default `"builtin_fcfs"`. -6. `sched_job_picker()` shall be retired and replaced by the unified loop; the hardcoded `"xce_sched_fcfs"` literal at `scheduler.c:43` shall be removed. +1. The Scheduler core loop shall call `picker->next_job(picker)` to get the next schedulable job (or NULL if none ready), and shall not contain any logic about project iteration, queue iteration, or job ordering — those concerns are entirely encapsulated inside the picker plugin. + +2. The job picker plugin interface (`xce_job_picker_iface_t`) shall define these operations, organized by category: + + **Lifecycle hooks** (MUST): + + | Operation | Signature | Semantics | + |-----------|-----------|-----------| + | `init` | `int (*init)(void* picker, xce_sched_core_t* core)` | One-time setup, receives core reference for state queries | + | `fini` | `void (*fini)(void* picker)` | Teardown and cleanup of all picker-owned resources | + + **State-change hooks** (MUST — called by core when events arrive from driver): + + | Operation | Signature | Semantics | Triggered by | + |-----------|-----------|-----------|-------------| + | `on_queue_update` | `int (*on_queue_update)(void* picker, xce_sched_queue_t* queue)` | Add/update queue in picker's internal ordering | `QUEUE_UPDATE` event | + | `on_job_push` | `int (*on_job_push)(void* picker, xce_sched_job_t* job)` | Add new pending job to picker's candidate set | `JOBS_PUSH` event | + | `on_job_state_change` | `int (*on_job_state_change)(void* picker, xce_sched_job_t* job, uint32_t new_state)` | Remove job from candidates if no longer pending; re-add if returning to pending | `JOB_STATE_CHANGE` event | + | `on_job_update` | `int (*on_job_update)(void* picker, xce_sched_job_t* job)` | Reorder job in candidates if priority/queue changed | `JOB_UPDATE` event | + + **Session hooks** (MUST — called at round boundaries): + + | Operation | Signature | Semantics | + |-----------|-----------|-----------| + | `begin_session` | `int (*begin_session)(void* picker)` | Reset iteration cursor; called at start of each scheduling round | + | `next_job` | `xce_sched_job_t* (*next_job)(void* picker)` | Return next schedulable job per picker's ordering, or NULL when exhausted | + | `end_session` | `int (*end_session)(void* picker)` | End-of-round notification; called before core sleeps between rounds | + + **Post-allocation hooks** (MUST — called after allocation attempt): + + | Operation | Signature | Semantics | + |-----------|-----------|-----------| + | `on_dispatch` | `int (*on_dispatch)(void* picker, uint64_t jobid)` | Job was allocated; remove from candidates permanently | + | `on_pend` | `int (*on_pend)(void* picker, uint64_t jobid)` | Job was pended; keep for next round but may deprioritize | + + **Optional hooks** (MAY — NULL if not needed): + + | Operation | Signature | Semantics | When needed | + |-----------|-----------|-----------|------------| + | `on_config` | `int (*on_config)(void* picker, xce_conf4sched_t* config)` | Rebuild picker strategy from config | Config-driven pickers (deadline, fair-share weights) | + | `on_job_rusage` | `int (*on_job_rusage)(void* picker, xce_sched_job_t* job, xce_job_rusages_t* rusages)` | Track per-job resource usage | Resource-aware pickers (fair-share, backfill) | + + Hooks not defined on the picker interface (worker updates, resource updates, resval updates) are not forwarded to the picker — picking is about job ordering, not resource availability. + +3. The core shall call state-change hooks synchronously during `core_push_event()` processing, before the event returns. Session hooks and post-allocation hooks are called synchronously during the scheduling session (between `BEGIN_ROUND` and session exhaustion). The picker runs in the core's scheduling thread — no dedicated picker thread. + +4. The core scheduling loop shall: + + ```c + begin_session(); + while ((job = picker->next_job(picker)) != NULL) { + if (try_allocate(job) > 0) { + picker->on_dispatch(picker, job->jobid); + emit_decision(DISPATCH, job); + } else if (can_preempt(job)) { + emit_decision(PREEMPT, job, victims); + picker->on_pend(picker, job->jobid); // retry next round + } else { + emit_decision(PEND, job); + picker->on_pend(picker, job->jobid); + } + } + end_session(); + ``` + + The core loop shall contain zero knowledge of project/queue/job ordering — all selection logic lives behind `next_job()`. + +5. The picker plugin shall be cancel-safe: `next_job()` shall have defined `pthread_cancel` cancellation points. The picker shall be session-aware: `begin_session()` resets iteration state, `end_session()` is called before sleep-between-rounds. + +6. The hardcoded `"xce_sched_fcfs"` literal at `scheduler.c:43` (in `sched_job_picker()`) shall be replaced by loading the configured `sched->job_pick_plugin` via the existing `plugin_register`/`key_find` mechanism. If the configured plugin name is not registered, the Scheduler shall fail with a clear configuration error (same pattern as Req 5 AC 5). + +7. `sched_job_picker()`'s dedicated thread and `jbuf` cbuf communication shall be retired. The picker runs synchronously within the core's scheduling thread — `next_job()` is called directly, not via a separate thread + cbuf. This eliminates one thread and simplifies the session lifecycle for simulation mode. ### Requirement 2: Lazy allocation plan iterator @@ -90,20 +278,22 @@ These are fundamentally different concerns: 4. When no plan among those generated in Criterion 1 can be satisfied, `my_alloc()` shall return the same not-satisfied signal (`0`) that the current stub returns today, so pend-reason handling in `sched_make_primary_alloc_()` is unaffected. 5. `parjob_allocator`'s `job_alloc_fn` shall no longer unconditionally `return 0` regardless of `ctx` contents — the current stub behavior — for any job with `maxTasks > 1`. -### Requirement 5: Configurable picker plugin slots +### Requirement 5: Configurable picker plugin -**Objective:** As a cluster operator, I want to configure job-picking policies at the scheduler, queue, and project levels without recompiling the scheduler, so that FCFS, priority, or custom pickers can be swapped operationally and composed. +**Objective:** As a cluster operator, I want to configure which job-picking policy the scheduler uses without recompiling, and override it per-queue, so that FCFS, priority, or custom pickers can be swapped operationally. #### Acceptance Criteria -1. The Scheduler shall add a `project_pick_plugin` field to `xce_scheduler_t`, defaulting to `"builtin_flat"` when unset. -2. The Scheduler shall add a `queue_pick_plugin` field to `xce_scheduler_t`, defaulting to `"builtin_strict_priority"` when unset. -3. The Scheduler shall add a `job_pick_plugin` field to `xce_scheduler_t`, defaulting to `"builtin_fcfs"` when unset — serving as the global fallback. -4. The Scheduler shall add a `job_pick_plugin` field to `xce_sched_queue_t`, defaulting to NULL (inherit from project or global). -5. The Scheduler shall add a `job_pick_plugin` field to `xce_sched_project_t`, defaulting to NULL (inherit from global). -6. The Scheduler shall add a `project_name` field to `xce_sched_queue_t`, set from queue configuration, establishing the queue→project relationship for Level 1 scoping. -7. The Scheduler shall accept all picker plugin names from scheduler configuration (or equivalent operator-facing settings), applied at scheduler startup without requiring a rebuild. -8. When a plugin slot names a plugin not registered via the existing `plugin_register`/`key_find` mechanism, the Scheduler shall fail with a clear configuration error rather than silently falling back to the builtin default. -9. The Scheduler shall document the picker plugin interface contract: each picker must be cancel-safe (responds to `pthread_cancel` at defined points) and session-aware (resets its state on `end_session`). +1. The Scheduler shall add a `job_pick_plugin` field to `xce_scheduler_t`, defaulting to `"builtin_fcfs"` when unset — this is the global picker plugin name. + +2. The Scheduler shall add a `job_pick_plugin` field to `xce_sched_queue_t`, defaulting to NULL (inherit from global). When non-NULL, the configured global picker plugin shall use this per-queue override for jobs within that queue. How the picker plugin uses per-queue overrides is an implementation detail of the plugin, not the core loop. + +3. The Scheduler shall add a `project_name` field to `xce_sched_queue_t`, set from queue configuration, establishing the queue→project relationship. The picker plugin may use this field internally for project-scoped iteration. + +4. The Scheduler shall accept the picker plugin name from scheduler configuration (or equivalent operator-facing settings), applied at scheduler startup without requiring a rebuild. + +5. When the configured plugin name is not registered via the existing `plugin_register`/`key_find` mechanism, the Scheduler shall fail with a clear configuration error rather than silently falling back to the builtin default. + +6. The picker plugin interface contract (`xce_job_picker_iface_t`) shall be documented: each picker must be cancel-safe (responds to `pthread_cancel` at defined points in `next_job()`) and session-aware (resets its iteration state on `begin_session()`). ### Requirement 6: Preemption policy and execution @@ -131,15 +321,58 @@ These are fundamentally different concerns: 4. Before starting full allocation for a job, the Scheduler shall look up the job's resreq fingerprint in the cache; on a hit, it shall pend the job immediately without invoking the plan or host iterators or preemption. 5. A cache hit shall attribute the same pend reason category as the original unsatisfiable determination, so operators are not misled about why a later job was skipped. -### Requirement 8: Builtin default plugins +### Architectural Support for Future Object Sharing (Deferred) -**Objective:** As a maintainer, I want the new architecture to ship with builtin plugins that replicate today's exact scheduling behavior, so that operators who don't configure custom pickers see no behavioral change. +Full object sharing (resreq template registry, pend reason dedup pool) is deferred to a follow-up spec. However, the architecture designed in this spec must not block sharing from being added later. The following design invariants apply to all resreq, pend-reason, and related objects touched by this spec: + +1. **Resreq immutability**: `xce_primary_resreq_t`, `xce_compound_resreq_t`, and `xce_alter_resreq_t` objects shall be treated as immutable once created and validated. No code path shall mutate a resreq in place. Any modification (e.g., expanding a job-array template into per-element resreqs) shall create a new copy. This ensures that sharing via `const` pointer is safe to introduce later without auditing every consumer for mutation. + +2. **Pend reason factory**: All pend reason allocation shall go through `make_pendreason()` (already the single factory in `lib/preason.c`). Callers never `calloc(sizeof(xce_pendreason_t))` directly. This ensures a session-level dedup pool can be added inside the factory later without changing any caller. + +3. **Pointer-identity fast path**: Code that compares two resreqs or two pend reasons shall use pointer equality (`a == b`) as a fast path before falling back to deep comparison. When a resreq registry is introduced, identical resreqs will have the same pointer — the fast path avoids repeated deep comparison for no runtime cost today. + +4. **Select expression memoization**: The existing `select_eval_ctx_t` per-session memoization of parsed select-expression ASTs shall be preserved and extended to the core's internal resreq objects. The parsed/evaluated form of a select expression shall be attached to the resreq on first evaluation and reused for subsequent evaluations (same session, same resreq pointer). + +5. **Snapshot forward-compatibility**: The snapshot format shall not preclude object sharing. Shared objects in the snapshot shall be serializable by identity (an object table with IDs) rather than requiring inline embedding at every reference site. This is a design-phase concern but constrains the JSON schema choice. + +These invariants impose zero overhead in the current implementation — immutability is already the pattern, pointer-identity fast paths are already valid C, and the factory already exists. They simply rule out design choices that would make sharing expensive or impossible to retrofit. + +### Requirement 8: Builtin default picker + +**Objective:** As a maintainer, I want the new architecture to ship with a builtin picker plugin that replicates today's exact scheduling behavior, so that operators who don't configure a custom picker see no behavioral change. #### Acceptance Criteria -1. **`builtin_flat`** (Level 0, project picker): shall yield exactly one "default" project scope per scheduling round. All queues not explicitly assigned to a project belong to this default project. Always eligible; never exhausted during a session. -2. **`builtin_strict_priority`** (Level 1, inter-queue picker): shall iterate queues in descending priority order (`queue->priority`). Shall skip queues with no pending jobs (`sched_queue_is_ready` returns false). When scoped to a project, shall only iterate queues belonging to that project. Shall return NULL when all eligible queues are exhausted. -3. **`builtin_fcfs`** (Level 2, intra-queue picker): shall replicate today's FCFS behavior — iterate pending jobs within the queue by `priority desc, queue_time asc`. Shall skip jobs where `sched_job_is_ready` returns false. Shall communicate the picked jobid via the existing `jbuf` cbuf mechanism. Shall be cancel-safe and session-aware. -4. All three builtin plugins shall be registered automatically at scheduler startup without requiring explicit configuration. + +1. **Registration**: `builtin_fcfs` shall be registered automatically at scheduler startup as `"builtin_fcfs"` and set as the default `sched->job_pick_plugin`. + +2. **Hook implementation** — `builtin_fcfs` shall implement every MUST and SHOULD hook from `xce_job_picker_iface_t` (Req 1 AC 2) as follows: + + | Hook | FCFS Implementation | + |------|-------------------| + | `init` | Allocate `fcfs_plugin_data_t`. Initialize `ordq_t queues` (ordered by `queue->priority desc`). Set iteration cursor to NULL. | + | `fini` | Free all per-queue `ordq_t pendJobs`, the `ordq_t queues`, and plugin data. | + | `on_queue_update` | Upsert queue into `ordq_t queues`. If queue exists, update its priority and reorder. If new, allocate `fcfs_queue_t` with empty `ordq_t pendJobs`. | + | `on_job_push` | If `job->state & JOB_STAT_PEND`: find the job's queue in `ordq_t queues`, add `fcfs_job_t{job}` to that queue's `ordq_t pendJobs` (ordered by `priority desc, queue_time asc`). | + | `on_job_state_change` | If `new_state` is not pending (EXIT/FAIL/DONE): remove job from its queue's `pendJobs` by jobid. If `new_state` returns to PEND: re-add to `pendJobs`. | + | `on_job_update` | If job's `priority` or `queue` field changed: remove from old position in `pendJobs`, re-insert at correct position per ordering. | + | `begin_session` | Reset iteration cursor to head of `ordq_t queues`. | + | `next_job` | Walk `ordq_t queues` from cursor. For each queue, skip if `sched_queue_is_ready()` returns false. Within queue, walk `ordq_t pendJobs`. Return first job where `sched_job_is_ready()` returns true. Advance cursor. Return NULL when all queues and jobs exhausted. | + | `end_session` | No-op for FCFS (iteration state reset in `begin_session`). | + | `on_dispatch` | Remove job from its queue's `ordq_t pendJobs` by jobid. | + | `on_pend` | No-op for FCFS — job remains in `pendJobs`, will be retried next round in same position. | + | `on_config` | NULL — FCFS is config-agnostic. | + | `on_job_rusage` | NULL — FCFS is not resource-aware. | + +3. **Internal data structures** — `builtin_fcfs` shall maintain its own private state, not query the core's `sched->queues`/`sched->jobs` during `next_job()`. All candidate management happens in the state-change hooks. This ensures: + - `next_job()` is fast — no core lock acquisition, no hash table scans + - The picker is independently testable — feed hooks, verify `next_job()` order + - Simulation snapshots capture picker state naturally via the hooks already recorded in the event stream + +4. **Ordering equivalence** — `builtin_fcfs` shall produce the same job-picking order as today's `fcfs_elect_job`: inter-queue by descending `queue->priority`, intra-queue by `priority desc, queue_time asc`. Behavior with per-queue picker overrides is as specified in Req 5 AC 2. + +5. **No dedicated thread** — `builtin_fcfs` shall implement `next_job()` as a synchronous call, not a dedicated thread + `jbuf` cbuf. The picker runs in the core's scheduling thread. `pthread_cancel` cancellation points shall exist in the `next_job()` iteration loop. + +6. **Session state** — `end_session()` is a no-op. Iteration state is reset in `begin_session()`. Undispatched jobs remain in `pendJobs` across sessions (they carry over to the next round). ### Requirement 9: No regression to existing allocators, job picker, or HA soak @@ -147,27 +380,162 @@ These are fundamentally different concerns: #### Acceptance Criteria 1. `seqjob_allocator`'s externally observable allocation behavior (which host a `maxTasks == 1` job lands on, given the same worker/resource state) shall be unchanged after it is rewrapped onto the `xce_host_iter_t` interface. -2. `builtin_fcfs` shall produce the same job-picking order as today's `fcfs_elect_job`, given the same queue and job state. -3. `builtin_strict_priority` shall produce the same inter-queue order as today's `fcfs_elect_job` queue iteration loop. -4. `builtin_flat` shall produce the same effective behavior as today's lack of project scoping — all queues in one flat namespace. -5. The `COMPOUND` and `ALTER` resreq allocation paths (`sched_make_compound_allocation`, `sched_make_alter_allocation` in `scheduler.c`) shall remain unchanged, continuing to call into the per-primary allocation path (now iterator-driven) exactly as they do today. -6. Existing scheduler unit tests (`scheduler` meson test suite) shall continue to pass unmodified in assertions, adjusted only where they directly exercised the removed hardcoded-string or eager-one-shot behavior this feature replaces. -7. A full HA soak (sequential and chaotic `/xce-test-ha` regression) shall show no new job loss, divergence, or liveness stall attributable to this feature, confirming the scheduler-side change does not perturb controller-side commit/replication behavior it reads state from. +2. `builtin_fcfs` shall produce the same job-picking order as today's `fcfs_elect_job`, given the same queue and job state — same inter-queue priority ordering and same intra-queue (priority desc, queue_time asc) ordering. +3. The `COMPOUND` and `ALTER` resreq allocation paths (`sched_make_compound_allocation`, `sched_make_alter_allocation` in `scheduler.c`) shall remain unchanged, continuing to call into the per-primary allocation path (now iterator-driven) exactly as they do today. +4. Existing scheduler unit tests (`scheduler` meson test suite) shall continue to pass unmodified in assertions, adjusted only where they directly exercised the removed hardcoded-string, dedicated picker thread, `jbuf` cbuf, or eager-one-shot behavior this feature replaces. +5. A full HA soak (sequential and chaotic `/xce-test-ha` regression) shall show no new job loss, divergence, or liveness stall attributable to this feature, confirming the scheduler-side change does not perturb controller-side commit/replication behavior it reads state from. + +### Requirement 10: Core/Driver Separation with Dual-Mode Operation + +**Objective:** As a scheduler developer, I want the scheduling core separated from all external I/O so that the same core logic runs deterministically in production (driven by a live controller) and in simulation (driven by recorded cluster events with a discrete event-driven virtual clock), enabling policy debugging, tuning, regression testing, and what-if analysis without a live cluster. + +#### Acceptance Criteria + +**Core Interface Contract** + +1. **Mode-agnostic core**: The Scheduler core shall have no concept of which mode it runs in. It processes events identically whether the driver is in normal mode (controller-connected, wall-clock time) or simulation mode (replay file, virtual clock). Specifically: + - There shall be no mode flag (`bool simulation_mode` or equivalent) anywhere in the core + - There shall be no `if (simulation) { ... } else { ... }` code path in the core + - `xce_sched_core_init()` shall take identical parameters regardless of mode (no mode-specific init arguments) + - The core's decision callback shall be the same function pointer type in both modes — the driver decides what to do with decisions (publish to controller vs. log to file) + - The core's `save_snapshot()` and `load_snapshot()` shall be identical in both modes — they serialize/deserialize core state, not driver state + +2. **Passive event-driven interface**: The core shall expose a pure event-driven interface — it receives typed events from the driver, updates internal scheduling state, and emits decisions through a driver-registered callback. The core shall have zero direct dependency on: controller communication, capnp serialization, network I/O, filesystem access, or wall-clock time sources. + +3. **Virtualized clock access**: The core shall access time exclusively through `xce_core_now()`. The core shall never call `time(NULL)`, `clock_gettime()`, `gettimeofday()`, or any other wall-clock time function directly. + + **Clock virtualization mechanism — two-base + speed formula:** + + The core stores three fields (atomically updated by the driver as a group): + + | Field | Type | Description | + |-------|------|-------------| + | `virtual_clock_base` | `_Atomic uint64_t` | Virtual-time anchor (nanoseconds) | + | `real_clock_base` | `_Atomic uint64_t` | Wall-clock anchor captured when `virtual_clock_base` was set (nanoseconds, `CLOCK_MONOTONIC`) | + | `speed_num` / `speed_den` | `_Atomic uint64_t` | Speed multiplier as rational fraction | + + `xce_core_now(core)` computes: + ```c + uint64_t wall_ns = clock_gettime(CLOCK_MONOTONIC); // only wall-clock call in the core + uint64_t elapsed = wall_ns - core->real_clock_base; + return core->virtual_clock_base + (elapsed * core->speed_num) / core->speed_den; + ``` + + | Mode | `virtual_clock_base` | `real_clock_base` | `speed` | Behavior | + |------|----------------------|-------------------|---------|----------| + | Normal | 0 | 0 | 1/1 | `xce_core_now()` = wall clock (degraded: `0 + (wall - 0) × 1`) | + | Simulation discrete | event `ts` | wall at load | 0/1 | `xce_core_now()` = frozen at event `ts` (time does not advance between events) | + | Simulation real-time | snapshot `ts` | wall at load | 1/1 | `xce_core_now()` tracks wall clock from virtual anchor | + | Simulation fast/slow | snapshot `ts` | wall at load | N/1 or 1/N | `xce_core_now()` runs N× faster or slower than wall clock | + + The driver atomically updates all three fields before each event dispatch. In simulation discrete mode (speed=0/1), the clock jumps directly from one event `ts` to the next — no continuous advancement. In normal mode (bases=0, speed=1/1), the formula degrades to returning wall-clock time directly, with zero overhead beyond the single `clock_gettime()` call. + + **Multi-thread safety**: `xce_core_now()` reads atomic fields lock-free. Both picker and allocator threads independently compute the same virtual time from the shared bases — no mutex needed. The driver updates all three fields as an atomic group (via a single mutex or sequenced atomic stores with a version counter). + + - All internal time uses go through `xce_core_now()`: scheduling logic (job queue-time ordering, session boundaries, pend-reason timestamps, job aging), **logging** (log message timestamps via tlog format function), **error messages**, **debug traces** — any code path that needs the current time calls `xce_core_now()` + - Job `sub_time` and `queue_time` are set by the driver (from `xce_core_now()` in normal mode, from event `ts` in simulation mode) before pushing the `JOBS_PUSH` event — the core never generates timestamps for externally-visible fields + - This virtualization is what enables deterministic replay: the same event file produces the same `xce_core_now()` return values (and therefore same log timestamps, same scheduling decisions) regardless of wall-clock speed + - **Third-party library constraint**: any library linked into the scheduler core that needs the current time must obtain it through `xce_core_now()` or a core-provided wrapper — never by calling `time()`, `clock_gettime()`, `gettimeofday()`, or similar directly. Specifically: + - **Logging (tlog)**: The `tlog` library internally captures `struct tlog_time` from wall-clock time before calling the registered format callback (`my_tlog_format`). The core shall register its own format function via `tlog_reg_format_func(fn, core_ptr)` where `core_ptr` is the `xce_sched_core_t*`. This format function shall ignore `info->time` entirely and instead read `xce_core_now(core_ptr)`, converting nanoseconds to `struct tm` fields via `gmtime_r()` (deterministic — pure computation from an integer, no system clock access). The `userptr` parameter of `tlog_reg_format_func()` carries the core pointer into the format callback. + - **libxce subset**: The core shall link only against the minimal data-structure subset of libxce (`ordq`, `dataq`, `cbuf`, `xlist`, `zarray`, `kvmgr`, `rtti`) — not against `netio`, `delay`, `xceapi`, or `idgen` which call wall-clock time internally + - **pthread timed-blocking**: The core is multi-threaded (picker + allocator threads). In simulation mode, thread interleaving is made deterministic per AC 6 — `pthread_cond_timedwait()` and `pthread_mutex_timedlock()` are not needed in the deterministic execution path + - If a library cannot avoid calling wall-clock time directly (e.g., a third-party compression or serialization library that internally timestamps), it must not be linked into the core; such concerns stay in the driver layer + +4. **Core event types**: The core interface shall accept at minimum these input events: + + | Event Type | Payload | Description | + |------------|---------|-------------| + | `CONFIG_PUSH` | `xce_conf4sched_t*` | Full configuration push (startup or config change) | + | `JOBS_PUSH` | `int njobs, xce_job_t**` | Newly submitted jobs | + | `WORKERS_PUSH` | `int nworkers, xce_worker_t**` | Worker list update | + | `RESOURCES_PUSH` | `int n, xce_resource_t**` | Resource definitions | + | `RESVALS_FULL` | `int n, xce_resval_t**` | Full resource value snapshot | + | `RESVALS_DELTA` | `xce_resval_list_t*` | Incremental resource value update | + | `JOB_STATE_CHANGE` | `uint64_t jobid, uint32_t state` | Job started / exited / failed | + | `JOB_UPDATE` | `xce_job_t*` | In-place job field update (notify path) | + | `QUEUE_UPDATE` | `xce_queue_t*` | Queue definition update | + | `JOB_RUSAGE` | `xce_job_rusages_t*` | Job resource usage update | + | `BEGIN_ROUND` | `uint64_t timestamp_ns` | Trigger scheduling round at given logical time | + +5. **Decision output callback**: The core shall emit all scheduling decisions (`DISPATCH`, `PEND`, `PREEMPT`) through a `xce_core_decision_cb_t` callback function pointer registered by the driver at core init time, replacing the current internal `decisions` cbuf + `main.c` poll loop pattern. The callback signature shall be `int (*on_decision)(void* driver_ctx, xce_decision_t* decision)`. + +6. **Deterministic guarantee**: Given identical initial state and identical event sequences with identical timestamps, the core shall produce identical decision sequences. The core is multi-threaded (picker thread + allocator thread, matching today's architecture). To achieve deterministic replay: + - All hash table / key-value store iteration that affects scheduling output order shall be stabilized (sorted by key before iterating) + - Any required randomness (e.g., tie-breaking) shall use a PRNG seeded by the driver at init time + - In simulation mode, thread interleaving shall either be made deterministic (e.g., the simulation driver serializes event dispatch and decision collection through a single-threaded core path), or the core's threads shall synchronize on a simulation barrier that advances in lock-step with the virtual clock + +7. **Driver event queue**: The driver shall retain an internal pending-event queue (the existing `xce_sched_update_request_t` / `pend_updates` mechanism, or equivalent) to buffer events received from the controller between scheduling rounds. Events accumulate in the driver between `BEGIN_ROUND` invocations. When the core receives `BEGIN_ROUND`, it drains all buffered events, processes a scheduling session, and emits decisions. + +**Normal-Mode Driver** + +8. **Controller integration**: The normal-mode driver shall receive capnp push/notify messages from the controller (via the existing `scheduler_req_handler` callback), translate each to the corresponding core event type, and invoke the core's event push interface. The driver shall publish core-emitted decisions back to the controller via the existing `xcecli_ctx_t` API (`sched_publish_dispatch` / `sched_publish_pend_reason` semantics, generalized to include `PREEMPT`). + +9. **Runtime recording control via xceadmin**: The scheduler shall support two new xceadmin commands: + - `scheduler record start [FILE]` — take a full state snapshot, write it to the replay file, then begin recording all subsequent core input events and output decisions to the file + - `scheduler record stop` — stop recording, close the replay file, resume normal operation + + Recording shall have zero impact on scheduling correctness — the core processes identically whether recording is active or not. + +10. **Periodic snapshot during recording**: While recording is active, the driver shall periodically append fresh snapshots to the replay file (default: every `N` events, configurable via `--record-snapshot-interval N`, where N=0 disables periodic snapshots and records only the initial snapshot). This bounds replay time for any desired start point. + +**Simulation-Mode Driver** + +11. **Simulation mode startup**: The scheduler shall support a simulation mode activated by `--sim FILE` (replay file path) and `--sim-start-ts TIMESTAMP` (logical time to begin replay, default: start of file). In simulation mode, the driver loads the most recent snapshot with `ts <= --sim-start-ts`, then replays all delta events from that point forward. + +12. **Discrete event-driven virtual clock**: The simulation driver shall implement a virtual clock that advances by jumping directly to the timestamp of the next queued event — no fixed tick interval, no wall-clock waiting between events. The clock shall be strictly monotonically increasing. When multiple events share the same timestamp, they shall be delivered in file order. The driver shall support: + - `--sim-speed N` — rate limit: N=0 means "as fast as possible" (no delay), N=1 means real-time, N>1 means N× real-time + - `--sim-pause-at TIMESTAMP` — pause simulation at a specific logical time for interactive debugging + +13. **Deterministic replay verification**: In simulation mode with `--sim-verify`, the driver shall compare each core-emitted decision against the recorded decisions in the replay file. Any mismatch (missing, extra, or different decision) shall be reported as a regression with exact logical-time and decision-detail context. + +14. **What-if branching**: The simulation driver shall accept `--sim-alt-events FILE` (alternative delta event file). When both a base replay file (for snapshot loading) and an alt-events file are provided, the driver loads the snapshot from the base file, then replays delta events from the alt-events file — enabling "what-if" analysis (e.g., "what if job X had been submitted with higher priority?"). + +**Replay File Format** + +15. **JSONL format**: The replay file shall be newline-delimited JSON (JSONL), one event per line: + + ```jsonl + {"type":"HEADER","version":"x.y.z","config_hash":"sha256...","start_ts":1234567890000000000,"start_wall":"2026-07-27T12:00:00Z"} + {"type":"SNAPSHOT","ts":1234567890000000000,"data":{...full core state...}} + {"type":"CONFIG_PUSH","ts":1234568000000000000,"payload":{...}} + {"type":"JOBS_PUSH","ts":1234568100000000000,"payload":{"njobs":2,"jobs":[...]}} + {"type":"BEGIN_ROUND","ts":1234568200000000000,"payload":{}} + {"type":"DECISION","ts":1234568200000000000,"payload":{"op":"DISPATCH","jobid":"..."}} + ``` + + - `type`: event type name string + - `ts`: nanosecond logical timestamp (monotonic, unsigned 64-bit integer) + - `payload`: event-type-specific object + - `HEADER` line: first line of every file, carries scheduler version and configuration hash for compatibility checking + - `SNAPSHOT` lines: embed full core state in `data` (plain JSON, not base64-encoded — debuggable and directly extractable) + - `DECISION` lines: recorded decisions (output), present only in files produced by the normal-mode driver's recording feature — the simulation driver ignores them unless `--sim-verify` is active + - The event payload JSON schema is an open design question deferred to the design phase + +**State Snapshot** + +16. **Snapshot serialization**: The core shall support `save_snapshot()` producing a full state dump (plain JSON) containing all config, queues (with per-queue picker/preemption settings), jobs (with state, priority, queue-time, resreq), workers (with available/used resources), resources, resvals, users, projects, shared-resource tracking state, unsatisfiable-resreq cache, and session state. The core shall support `load_snapshot()` restoring to that exact state, producing a core that is indistinguishable from one that reached that state by replaying all events up to that timestamp. + +**Interaction with Existing Requirements** + +Reqs 1–9 describe logic **inside** the core — the picker loop, iterators, parjob allocator, preemption policy, resreq cache, and builtin plugins all operate within the core's event-driven boundary. Requirement 10 defines the boundary itself. Specifically: + +- Req 5 (picker slots from config): config arrives via `CONFIG_PUSH` event, not via capnp decode inside the core +- Req 6 (preemption → controller): `XCE_DECISION_PREEMPT` is emitted through the decision callback, not sent directly to controller +- Req 7 (resreq cache, session lifecycle): `BEGIN_ROUND` replaces the implicit `sleep(1)`-delimited session boundary in `main.c`; the cache still lives on `xce_sched_core_t` and is cleared at session start +- Req 9 (HA soak regression): the same core code can be validated in simulation mode against recorded HA failover traces, catching regressions without a live cluster ## Data Structure Changes Summary ### `xce_scheduler_t` additions ```c -char* project_pick_plugin; // default: "builtin_flat" -char* queue_pick_plugin; // default: "builtin_strict_priority" -char* job_pick_plugin; // default: "builtin_fcfs" (global fallback) +char* job_pick_plugin; // default: "builtin_fcfs" (Req 5) // unsatisfiable resreq cache (Req 7) ``` ### `xce_sched_queue_t` additions ```c -char* project_name; // owning project (for Level 1 scoping) -char* job_pick_plugin; // intra-queue picker (NULL = inherit) +char* project_name; // owning project (picker uses internally) +char* job_pick_plugin; // per-queue picker override (NULL = use global) char** preemptible_queues; // queues this queue CAN preempt from int n_preemptible_queues; bool preemptible; // CAN this queue's jobs BE preempted? @@ -176,11 +544,23 @@ char* preempt_policy; // victim selection plugin (NULL = default) ### `xce_sched_project_t` additions ```c -char* job_pick_plugin; // per-project picker (NULL = inherit, v1 field, v2 logic) int32_t priority; // inter-project ordering (future spec) // future: resource_quota, resource_used, parent_project (project-resource-ownership spec) ``` +### `xce_job_picker_iface_t` (new, Req 1) +```c +typedef struct { + int (*init)(void* picker, xce_sched_core_t* core); + void (*fini)(void* picker); + int (*begin_session)(void* picker); + xce_sched_job_t* (*next_job)(void* picker); + int (*end_session)(void* picker); + int (*on_dispatch)(void* picker, uint64_t jobid); + int (*on_pend)(void* picker, uint64_t jobid); +} xce_job_picker_iface_t; +``` + ### `decision.h` additions ```c typedef enum { @@ -199,43 +579,274 @@ typedef struct { } xce_preempt_decision_t; ``` +### Core/Driver Separation (Req 10) + +```c +// Core event (driver → core) +typedef enum { + XCE_CORE_EVENT_CONFIG_PUSH = 0, + XCE_CORE_EVENT_JOBS_PUSH, + XCE_CORE_EVENT_WORKERS_PUSH, + XCE_CORE_EVENT_RESOURCES_PUSH, + XCE_CORE_EVENT_RESVALS_FULL, + XCE_CORE_EVENT_RESVALS_DELTA, + XCE_CORE_EVENT_JOB_STATE_CHANGE, + XCE_CORE_EVENT_JOB_UPDATE, + XCE_CORE_EVENT_QUEUE_UPDATE, + XCE_CORE_EVENT_JOB_RUSAGE, + XCE_CORE_EVENT_BEGIN_ROUND, +} xce_core_event_type_t; + +typedef struct { + xce_core_event_type_t type; + uint64_t ts; // driver-supplied logical time (ns) + union { + xce_conf4sched_t* config; + struct { int njobs; xce_job_t** jobs; } job_push; + struct { int nworkers; xce_worker_t** workers; } worker_push; + struct { int n; xce_resource_t** resources; } resource_push; + struct { int n; xce_resval_t** vals; } resval_full; + xce_resval_list_t* resval_delta; + struct { uint64_t jobid; uint32_t state; } job_state; + xce_job_t* job_update; + xce_queue_t* queue_update; + xce_job_rusages_t* job_rusage; + // BEGIN_ROUND has no payload beyond ts + } payload; +} xce_core_event_t; + +// Decision callback (core → driver) +typedef int (*xce_core_decision_cb_t)(void* driver_ctx, xce_decision_t* decision); + +// Core struct (pure scheduling state, no I/O) +typedef struct { + // Scheduling state (moved from xce_scheduler_t) + xce_conf4sched_t* config; + uint64_t configver; + var plugins; + void* seqjob_allocator; + void* parjob_allocator; + void* affinity_allocator; + void* gpu_allocator; + var resmgr, ugmgr, qgmgr, pgmgr, hgmgr; + zarray_t sharedInst, sharedInUse; + var jobs, queues, workers, users, projects; + uint64_t nextid; + + // New fields for core/driver boundary + void* driver_ctx; // opaque driver context for callback + xce_core_decision_cb_t on_decision; // decision output callback + // Clock virtualization (Req 10 AC 3) — atomically updated by driver + _Atomic uint64_t virtual_clock_base; // virtual-time anchor (ns) + _Atomic uint64_t real_clock_base; // wall-clock anchor (ns, CLOCK_MONOTONIC) + _Atomic uint64_t speed_num; // speed numerator + _Atomic uint64_t speed_den; // speed denominator + uint64_t prng_seed; // seeded by driver at init + + // Picker plugin slot (Req 5) + char* job_pick_plugin; // default: "builtin_fcfs" + // per-queue overrides stored on xce_sched_queue_t.job_pick_plugin, + // read by the picker internally — not separate core slots + + // Unsatisfiable resreq cache (Req 7) + // ... (session-level fingerprint cache) + + // Session state + _Atomic int session_active; + _Atomic int eval_in_progress; + select_eval_ctx_t* sel_eval_ctx; +} xce_sched_core_t; + +// Normal-mode driver +typedef struct { + xce_sched_core_t core; + xcecli_ctx_t apictx; // controller API client + xce_cluster_config_t cluster_cfg; // HA candidate list + dataq_t* pend_updates[2]; // event buffer between rounds + // Recording state + FILE* record_file; + bool recording; + uint64_t record_snapshot_interval; + uint64_t events_since_snapshot; +} xce_sched_driver_t; + +// Simulation-mode driver +typedef struct { + xce_sched_core_t core; + FILE* replay_file; + uint64_t virtual_clock; // current logical time (ns) + uint64_t sim_speed; // 0=unlimited, 1=real-time, N=N× + uint64_t pause_at_ts; // 0=don't pause + bool verify; // compare decisions vs recorded + FILE* alt_events_file; // for what-if branching +} xce_sched_sim_driver_t; + +// Core interface +int xce_sched_core_init(xce_sched_core_t* core, xce_core_decision_cb_t cb, + void* driver_ctx, uint64_t prng_seed); +int xce_sched_core_push_event(xce_sched_core_t* core, xce_core_event_t* event); +uint64_t xce_core_now(xce_sched_core_t* core); // virtualized clock accessor +int xce_sched_core_save_snapshot(xce_sched_core_t* core, FILE* out); +int xce_sched_core_load_snapshot(xce_sched_core_t* core, FILE* in); +void xce_sched_core_fini(xce_sched_core_t* core); +``` + ## Architecture Diagram +### Core Scheduling Loop + ``` ┌──────────────────────────────────────────────────────────┐ -│ Level 0: Project Picker [sched->project_pick_plugin] │ +│ SCHEDULER CORE LOOP │ │ │ -│ v1 (builtin_flat): yields one "default" project │ -│ v2 (future): quota-aware project selection │ -└──────────────────────┬───────────────────────────────────┘ - │ project scope - ▼ -┌──────────────────────────────────────────────────────────┐ -│ Level 1: Inter-Queue Picker [sched->queue_pick_plugin] │ -│ │ -│ Iterates queues scoped to the selected project │ -│ Default: strict_priority (descending queue->priority) │ -└──────────────────────┬───────────────────────────────────┘ - │ queue - ▼ -┌──────────────────────────────────────────────────────────┐ -│ Level 2: Intra-Queue Picker [queue→project→sched] │ -│ │ -│ Picks one job from the selected queue │ -│ Default: builtin_fcfs (priority desc, queue_time asc) │ -└──────────────────────┬───────────────────────────────────┘ - │ job - ▼ -┌──────────────────────────────────────────────────────────┐ -│ Allocation + Preemption │ -│ │ -│ plan_iter → host_iter → try_alloc │ -│ success → dispatch │ -│ fail → Level 3: preempt? → select victims → SIGSTP │ -│ → pend (no preemption possible) │ +│ begin_session() │ +│ │ │ +│ ▼ │ +│ ┌──────────────────────┐ │ +│ │ picker->next_job() │ ←─ plugin decides HOW │ +│ │ returns job or NULL │ (FCFS, priority, fair-share, │ +│ └──────────┬───────────┘ deadline, ...) │ +│ │ │ +│ job │ NULL (exhausted) │ +│ ▼ ▼ │ +│ ┌──────────────────┐ end_session() → sleep → next round │ +│ │ try_allocate(job) │ │ +│ └────────┬─────────┘ │ +│ │ │ +│ success │ fail │ +│ ▼ ▼ │ +│ ┌────────────┐ ┌────────────────┐ │ +│ │ DISPATCH │ │ can_preempt? │ │ +│ │ on_dispatch│ │ yes → PREEMPT │ │ +│ └────────────┘ │ no → PEND │ │ +│ │ on_pend │ │ +│ └────────────────┘ │ +│ │ │ +│ ▼ │ +│ next_job() (loop continues) │ └──────────────────────────────────────────────────────────┘ ``` +### `builtin_fcfs` Internal Design + +The default picker plugin internally implements the equivalent of today's selection logic. This is **not** part of the core loop — it's the plugin's private implementation: + +``` +builtin_fcfs.next_job(): + ┌────────────────────────────────────────────┐ + │ Iterate queues by priority (descending) │ + │ Skip queues with no ready jobs │ + │ │ + │ For each queue: │ + │ If queue has per-queue picker override: │ + │ Delegate to that picker │ + │ Else: │ + │ Iterate jobs by priority desc, │ + │ queue_time asc (FCFS) │ + │ Skip jobs not ready │ + │ Return first ready job │ + │ │ + │ Return NULL if all queues exhausted │ + └────────────────────────────────────────────┘ +``` + +## Core/Driver Architecture (Req 10) + +``` +┌──────────────────────────────────────────────────────────────────┐ +│ DRIVER LAYER │ +│ │ +│ ┌──────────────────────┐ ┌────────────────────────────┐ │ +│ │ NORMAL MODE │ │ SIMULATION MODE │ │ +│ │ │ │ │ │ +│ │ controller capnp ────┐│ │ replay.jsonl ──────────┐ │ │ +│ │ (scheduler_req_ ││ │ (event file) │ │ │ +│ │ handler) ││ │ │ │ │ +│ │ │ ││ │ │ │ │ │ +│ │ ▼ ││ │ ▼ │ │ │ +│ │ ┌──────────────┐ ││ │ ┌──────────────┐ │ │ │ +│ │ │ event queue │ ││ │ │ virtual clock│ │ │ │ +│ │ │ (pend_updates)│ ││ │ │ (discrete │ │ │ │ +│ │ └──────┬───────┘ ││ │ │ event-driven)│ │ │ │ +│ │ │ ││ │ └──────┬───────┘ │ │ │ +│ │ │ events ││ │ │ events │ │ │ +│ │ │ + BEGIN_ROUND││ │ │ + BEGIN_ROUND │ │ │ +│ │ ▼ ││ │ ▼ │ │ │ +│ │ ┌──────────────┐ ││ │ ┌──────────────┐ │ │ │ +│ │ │ publish │ ││ │ │ record/log │ │ │ │ +│ │ │ decisions to │ ││ │ │ decisions │ │ │ │ +│ │ │ controller │ ││ │ │ (--sim-verify)│ │ │ │ +│ │ └──────▲───────┘ ││ │ └──────▲───────┘ │ │ │ +│ │ │ decisions ││ │ │ decisions │ │ │ +│ └─────────┼─────────────┘│ └─────────┼───────────────┘ │ +│ │ │ │ │ +│ │ xce_core_decision_cb_t │ │ +│ │ (callback) │ │ +└────────────┼──────────────────────────────────┼───────────────────┘ + │ │ + ▼ ▼ +┌──────────────────────────────────────────────────────────────────┐ +│ SCHEDULER CORE │ +│ (xce_sched_core_t) │ +│ │ +│ ┌─────────────────────────────────────────────────────────────┐ │ +│ │ xce_sched_core_push_event(core, event) │ │ +│ │ │ │ +│ │ Event types: CONFIG_PUSH, JOBS_PUSH, WORKERS_PUSH, │ │ +│ │ RESOURCES_PUSH, RESVALS_FULL, RESVALS_DELTA, │ │ +│ │ JOB_STATE_CHANGE, JOB_UPDATE, QUEUE_UPDATE, │ │ +│ │ JOB_RUSAGE, BEGIN_ROUND │ │ +│ └──────────────────────────┬──────────────────────────────────┘ │ +│ │ │ +│ ▼ │ +│ ┌─────────────────────────────────────────────────────────────┐ │ +│ │ Internal Scheduling Logic (Reqs 1–9) │ │ +│ │ │ │ +│ │ picker->next_job() → try_allocate(job) │ │ +│ │ │ │ │ │ +│ │ │ xce_alloc_plan_iter_t │ │ │ +│ │ │ → xce_host_iter_t │ │ │ +│ │ │ → try alloc │ │ │ +│ │ │ │ │ │ +│ │ │ success → DISPATCH │ │ │ +│ │ │ fail → PREEMPT or PEND │ │ │ +│ │ │ → picker->on_dispatch() │ │ │ +│ │ │ → picker->on_pend() │ │ │ +│ │ │ │ │ │ +│ │ Preemption (if alloc fails): │ │ +│ │ select victims → SIGSTP → pend job → retry next round │ │ +│ │ Resreq fingerprint cache (per-session) │ │ +│ └──────────────────────────┬──────────────────────────────────┘ │ +│ │ │ +│ ▼ │ +│ ┌─────────────────────────────────────────────────────────────┐ │ +│ │ on_decision(driver_ctx, decision) │ │ +│ │ DISPATCH / PEND / PREEMPT │ │ +│ └─────────────────────────────────────────────────────────────┘ │ +│ │ +│ ZERO dependencies on: controller, capnp, network, wall-clock │ +└──────────────────────────────────────────────────────────────────┘ +``` + +### Simulation Replay Sequence + +``` + load snapshot replay delta events + │ │ + ▼ ▼ + ┌──────────┐ ┌──────────┐ ┌──────────┐ ┌──────────┐ + │ HEADER │───▶│ SNAPSHOT │───▶│ EVENT @t1 │───▶│ EVENT @t2 │───▶ ... + └──────────┘ └──────────┘ └──────────┘ └──────────┘ + │ │ │ + ▼ ▼ ▼ + restore core push + BEGIN_ push + BEGIN_ + state via ROUND(t1) → ROUND(t2) → + load_snapshot emit decisions emit decisions + + Virtual clock: t_snap ────────▶ t1 ───────────▶ t2 ───────────▶ + (discrete jumps, no wall-clock delay, monotonic) +``` + ## Preemption Flow ``` @@ -261,15 +872,15 @@ XCE_DECISION_PREEMPT ────────────▶ handle_job_preempt( J pended → next scheduling round → allocation retries on freed resources ``` -## Future: Project Resource Ownership (Level 0 full) +## Future: Project Resource Ownership Deferred to a separate `project-resource-ownership` spec. When implemented: - Projects form a tree with resource quota at each node -- Level 0 project picker selects which project gets resources (fair-share, priority, proportional) -- Level 1 queue picker is scoped to the selected project's queues -- Level 2 job picker sees only jobs from the selected project within each queue -- Project quota enforcement: projects over quota are skipped by Level 0 -- The unified picker loop (Requirement 1) requires zero code changes — only a new project picker plugin replaces `builtin_flat` +- A project-aware picker plugin selects which project gets resources (fair-share, priority, proportional), then iterates queues scoped to that project, then jobs within each queue +- Project quota enforcement: projects over quota are skipped by the picker +- The core scheduling loop (Requirement 1) requires zero code changes — only a new picker plugin replaces `builtin_fcfs`. The core still calls `picker->next_job()` with no knowledge of projects. +- `queue->project_name` (added here) provides the queue→project mapping the v2 picker consumes +- `xce_sched_project_t` scaffolding (added here) provides the struct the v2 picker extends with quota/usage fields -The architecture is designed so that v1 (flat) and v2 (hierarchical) share the identical scheduling loop. The only difference is which project picker plugin is configured. +The architecture is designed so that v1 (flat, `builtin_fcfs` ignores projects) and v2 (hierarchical, project-aware picker) share the identical core scheduling loop. The only difference is which picker plugin is configured. diff --git a/.kiro/specs/scheduler-framework/spec.json b/.kiro/specs/scheduler-framework/spec.json index 4e26313..8c5192d 100644 --- a/.kiro/specs/scheduler-framework/spec.json +++ b/.kiro/specs/scheduler-framework/spec.json @@ -1,9 +1,10 @@ { "feature_name": "scheduler-framework", "created_at": "2026-07-09T21:20:00Z", - "updated_at": "2026-07-10T10:00:00Z", + "updated_at": "2026-07-27T00:00:00Z", "language": "en", - "phase": "requirements-generated", + "phase": "decomposed", + "description": "DECOMPOSED into scheduler-core, scheduler-allocation, scheduler-preemption. This spec is retained for discovery context; see child specs for active requirements.", "approvals": { "requirements": { "generated": true, @@ -19,5 +20,6 @@ } }, "ready_for_implementation": false, - "blocked_on": [] + "blocked_on": [], + "child_specs": ["scheduler-core", "scheduler-allocation", "scheduler-preemption"] } diff --git a/.kiro/specs/scheduler-preemption/brief.md b/.kiro/specs/scheduler-preemption/brief.md new file mode 100644 index 0000000..25025ed --- /dev/null +++ b/.kiro/specs/scheduler-preemption/brief.md @@ -0,0 +1,183 @@ +# Brief: scheduler-preemption + +## Problem + +The XCE scheduler has no preemption mechanism. When a high-priority job cannot be scheduled because all resources are consumed by lower-priority running jobs, the scheduler has no way to free those resources. The job is simply pended, and it waits indefinitely — regardless of its priority — until running jobs naturally complete. + +Three specific gaps exist: + +1. **No preemption decision type** — the `xce_decision_op_t` enum has `DISPATCH` and `PEND` but no `PREEMPT`. The scheduler cannot communicate a preemption intent to the controller. +2. **No victim selection mechanism** — even if a preemption decision type existed, there is no logic to select which running jobs should be preempted. Cross-queue victim selection (a high-priority job in queue A preempting a low-priority job in queue B) is entirely absent. +3. **No SIGSTP pipeline** — the controller and worker have no path to deliver a stop signal to a running job and transition its state to `JOB_SUSPENDED`, freeing its resources for the preempting job. + +Operators with mixed-priority workloads need preemption to ensure critical work proceeds without manual intervention — the operator should not have to manually kill low-priority jobs to make room. + +## Current State + +### What exists +- **Decision framework** (`decision.h`): `xce_decision_op_t` with `DISPATCH`, `PEND`, and `NONE` ops. Core/decision callback flows to driver/controller. +- **Queue structure** (`xce_sched_queue_t`): has `priority` field for inter-queue ordering within the picker, but no preemption-related fields. +- **HOOK_DETAIL_JOB_STOP** (enum value 65 in `cluster_def.h`): existing hook detail enum, reused for preemption stop notifications. +- **Controller→worker messaging**: existing message pipeline for dispatch/pend decisions; the same path can carry preemption actions to workers. + +### What's missing +- `XCE_DECISION_PREEMPT` opcode and `xce_preempt_decision_t` payload in `decision.h` +- Victim selection policy: which running jobs get preempted for a given high-priority job +- Per-queue preemption configuration: which queues can preempt from which other queues, which queues are immune to preemption +- SIGSTP delivery pipeline: scheduler → controller → worker → process group +- Job state transition to `JOB_SUSPENDED` triggered by preemption +- Integration of preemption into the scheduling loop: when allocation fails, attempt preemption before pended + +## Desired Outcome + +A job preemption system with three layers: + +**1. Decision type** — `XCE_DECISION_PREEMPT` carries victim jobids, signal type, and preempting job id through the core's decision callback → normal-mode driver → controller → worker pipeline, reusing the same callback infrastructure (`xce_core_decision_cb_t`) used by `DISPATCH` and `PEND`. + +**2. Victim selection** — a `preempt_policy` plugin on each queue selects which running jobs to preempt. The default policy `"lowest_priority_first"` implements LSF-style cross-queue victim selection: +- Collect running jobs from the preempting job's `preemptible_queues` list +- Filter: victim priority < preempting job priority AND victim's queue has `preemptible == true` +- Rank by priority ascending (lowest priority first) +- Select the minimum subset whose freed resources satisfy the preempting job's resreq + +**3. SIGSTP pipeline** — the controller receives `XCE_DECISION_PREEMPT`, delivers `HOOK_DETAIL_JOB_STOP` to each victim's worker, the worker sends SIGSTP to the job's process group, the controller transitions the job to `JOB_SUSPENDED`, and resources are released. The preempting job is pended and retried in the next scheduling round (async preemption). + +### Queue Preemption Configuration + +Each queue carries three new fields: + +| Field | Type | Purpose | +|-------|------|---------| +| `preemptible_queues` | `char**` | List of queue names this queue CAN preempt from | +| `preemptible` | `bool` | Whether this queue's jobs CAN BE preempted by other queues | +| `preempt_policy` | `char*` | Victim-selection plugin name (NULL = use default) | + +## Alternatives Considered + +### Approach A: Kill-and-requeue only (rejected) + +| Aspect | Detail | +|--------|--------| +| **Mechanism** | SIGKILL victims, requeue from scratch | +| **Pros** | Simple, no suspended state, no resume logic | +| **Cons** | Destroys progress, lose all intermediate computation. Requeued jobs restart from zero. Not viable for long-running HPC workloads where checkpointing is explicit. | + +**Rejected because:** HPC jobs can run for hours or days. Killing a job that is 90% complete to make room for a higher-priority job wastes all accumulated work. SIGSTP + resume preserves progress when the preempted job is later resumed. + +### Approach B: SIGSTP with suspend/resume (chosen) + +| Aspect | Detail | +|--------|--------| +| **Mechanism** | SIGSTP to process group → job → `JOB_SUSPENDED` → resources freed → preempting job runs → preempted job optionally resumed later | +| **Victim selection** | Policy plugin per queue, default `"lowest_priority_first"` | +| **Cross-queue** | Per-queue `preemptible_queues` list enables cross-queue preemption | +| **Scope** | v1 is SIGSTP only; kill-and-requeue escalation deferred | + +**Chosen because:** Preserves victim job progress. Enables later resume (outside this spec's scope). Aligns with LSF-style preemption semantics familiar to HPC operators. The async pattern (pend preempting job, retry next round after SIGSTP) keeps the scheduling loop simple. + +## Approach + +### Preemption Flow + +``` +scheduler controller worker +─────────── ────────── ────── +alloc fails for high-prio job J + +preempt_policy.select_victims(J): + collect running jobs from + Q_aggressor.preemptible_queues + filter: victim.prio < J.prio + filter: victim.queue.preemptible + rank: lowest priority first + select minimum set satisfying J.resreq + + → [victim1, victim2] + +XCE_DECISION_PREEMPT ────────────▶ handle_job_preempt() ──────▶ SIGSTP victim1 + .victim_jobids = [v1, v2] deliver to each job → JOB_SUSPENDED + .signal = SIGSTP victim's worker release resources + .preempting_jobid = J + +J pended → next round → retry alloc +``` + +### Integration into Scheduling Loop + +Preemption fires at Level 3 in the core scheduling loop — after allocation failure, before pending: + +```c +while ((job = picker->next_job(picker)) != NULL) { + if (try_allocate(job) > 0) { + emit_decision(DISPATCH, job); + picker->on_dispatch(picker, job->jobid); + } else if (can_preempt(job)) { + victims = select_victims(job); + emit_decision(PREEMPT, job, victims); + picker->on_pend(picker, job->jobid); // retry next round + } else { + emit_decision(PEND, job); + picker->on_pend(picker, job->jobid); + } +} +``` + +The core loop itself contains no victim selection logic — that lives in the `preempt_policy` plugin. The core only checks `can_preempt(job)` (does the job's queue have a non-NULL `preemptible_queues` list?) and delegates to the policy plugin for victim selection. + +### What stays unchanged +- Core scheduling loop — preemption is an additional branch in the alloc-fail path (Level 3), not a restructure +- Decision callback (`xce_core_decision_cb_t`) — `PREEMPT` flows through the same callback as `DISPATCH` and `PEND` +- Existing plugin framework — `preempt_policy` is registered, loaded, and invoked through the existing `plugin_register`/`key_find` mechanism +- `HOOK_DETAIL_JOB_STOP` — existing enum value, reused without change + +### What's new +- `XCE_DECISION_PREEMPT` in `xce_decision_op_t` (`decision.h`) +- `xce_preempt_decision_t` payload carrying `victim_jobids[]`, `n_victims`, `signal`, `preempting_jobid` +- `preemptible_queues`, `preemptible`, `preempt_policy` fields on `xce_sched_queue_t` +- Default `"lowest_priority_first"` preemption policy plugin +- Controller handler for `XCE_DECISION_PREEMPT` → SIGSTP delivery to workers +- Worker-side SIGSTP handler → process group signal + `JOB_SUSPENDED` state transition + +## Scope + +### In +- `XCE_DECISION_PREEMPT` decision type and `xce_preempt_decision_t` payload +- `preempt_policy` plugin interface (victim selection) +- Default `"lowest_priority_first"` preemption policy +- LSF-style cross-queue victim selection via `preemptible_queues` list +- SIGSTP pipeline: scheduler → controller → worker → process group +- Per-queue preemption config: `preemptible_queues`, `preemptible`, `preempt_policy` +- Victim safety guards: never preempt same-or-higher priority, never preempt non-`preemptible` queues +- `JOB_SUSPENDED` state transition on victim jobs +- Reuse of `HOOK_DETAIL_JOB_STOP` for preemption stop notifications +- Unit tests: victim selection policy, safety guard enforcement, edge cases (empty target queues, no eligible victims, insufficient resources from any victim set) +- Integration test: end-to-end preemption flow — high-priority job submits, preemption fires, victims get SIGSTP, resources freed, preempting job dispatched in next round + +### Out +- Kill-and-requeue escalation (v1 is SIGSTP only) +- Deadline-based preemption (requires `deadline` field on jobs — deferred) +- Preempted job resume logic (outside this spec's scope — the `JOB_SUSPENDED` state is defined, but the resume mechanism is a separate feature) +- Preemption priority inversion guards beyond the priority comparison already specified +- Fair-share or proportional victim selection beyond the default `"lowest_priority_first"` policy (the plugin interface enables custom policies, but none beyond the default ship here) + +## Upstream / Downstream + +### Upstream (dependencies) +- **scheduler-core** (sibling spec): provides the decision callback (`xce_core_decision_cb_t`) through which `XCE_DECISION_PREEMPT` flows. The core scheduling loop and `xce_sched_core_t` are defined there. Preemption hooks into the core loop at Level 3 (alloc-fail branch). +- **scheduler-allocation** (sibling spec): provides `try_allocate()` — preemption fires only when allocation fails. The resreq fingerprint cache interacts with preemption (a cached-unsatisfiable resreq skips allocation AND preemption). +- **Controller message handling**: existing handler dispatch path for decisions — extended to handle `XCE_DECISION_PREEMPT`. +- **Worker job control**: existing job lifecycle management — extended to handle SIGSTP delivery and `JOB_SUSPENDED`. + +### Downstream (future consumers) +- **Resume mechanism** — a future spec for resuming `JOB_SUSPENDED` jobs, potentially with priority-based ordering +- **Kill-and-requeue escalation** — a future enhancement where repeated preemption failure escalates to SIGKILL +- **Custom preemption policies** — deadline-aware, fair-share, or resource-specific victim selection implemented as new `preempt_policy` plugins + +## Constraints +- **C (gnu17)** — no C++, no external libraries beyond existing (pthreads) +- **Async preemption** — the preempting job is pended and retried in the next scheduling round; preemption is not synchronous +- **Priority guard** — victim priority must be strictly less than preempting job priority (never preempt equal or higher) +- **Preemptible guard** — victim queue must have `preemptible == true` (opt-in — queues are not preemptible by default) +- **Minimal victim set** — select the minimum subset of victims whose freed resources satisfy the preempting job's resreq (avoid over-preemption) +- **No self-preemption** — the preempting job's own queue is implicitly excluded from victim selection +- **Cancel-safe** — `preempt_policy.select_victims()` must have `pthread_cancel` cancellation points diff --git a/.kiro/specs/scheduler-preemption/requirements.md b/.kiro/specs/scheduler-preemption/requirements.md new file mode 100644 index 0000000..72e8b22 --- /dev/null +++ b/.kiro/specs/scheduler-preemption/requirements.md @@ -0,0 +1,109 @@ +# Requirements Document + +## Introduction + +The XCE scheduler currently has no job preemption mechanism. When a high-priority job cannot be scheduled because all resources are consumed by lower-priority running jobs, the only available action is to pend the job — it waits indefinitely until running jobs complete naturally, regardless of priority. + +This feature closes the preemption gap with three additions: + +1. A `XCE_DECISION_PREEMPT` decision type flowing through the same callback as `DISPATCH` and `PEND`, carrying victim job ids and signal type to the controller→worker pipeline. +2. A configurable `preempt_policy` plugin mechanism for victim selection, with a built-in `"lowest_priority_first"` default policy implementing LSF-style cross-queue victim selection. +3. A SIGSTP delivery pipeline: scheduler emits `XCE_DECISION_PREEMPT` → controller delivers `HOOK_DETAIL_JOB_STOP` to each victim's worker → worker sends SIGSTP to the job's process group → controller transitions the job to `JOB_SUSPENDED` and releases resources. + +The design uses async preemption: the preempting job is pended and retried in the next scheduling round after resources are freed, rather than blocking the scheduling loop waiting for victims to stop. + +> Full discovery context (problem, current state, alternatives considered, approach, boundary) is in `.kiro/specs/scheduler-preemption/brief.md`. +> +> This spec is a child of `scheduler-framework`. It depends on **scheduler-core** for the decision callback (`xce_core_decision_cb_t`) through which `XCE_DECISION_PREEMPT` flows. The preemption branch (Level 3) fires in the core scheduling loop after allocation failure, before pending — this integration point is defined in scheduler-core's requirements. + +## Boundary Context + +- **In scope**: `XCE_DECISION_PREEMPT` opcode and `xce_preempt_decision_t` payload in `decision.h`; `preempt_policy` plugin interface for victim selection; default `"lowest_priority_first"` preemption policy implementing LSF-style cross-queue victim selection; per-queue preemption configuration (`preemptible_queues`, `preemptible`, `preempt_policy` fields on `xce_sched_queue_t`); SIGSTP delivery pipeline through controller→worker; `JOB_SUSPENDED` state transition on victim jobs; reuse of `HOOK_DETAIL_JOB_STOP` for preemption stop notifications; victim safety guards (never preempt same-or-higher priority, never preempt non-`preemptible` queues, never over-preempt); integration with the core scheduling loop at Level 3 (alloc-fail branch). + +- **Out of scope**: Kill-and-requeue escalation beyond SIGSTP (deferred — v1 is SIGSTP only); deadline-based preemption (requires `deadline` field on `xce_sched_job_t`, deferred); preempted job resume logic (the `JOB_SUSPENDED` state is defined but resume is a separate feature); fair-share or proportional victim selection policies beyond the default (the plugin interface enables them, but no additional policies ship here); changes to the picker interface, iterator abstractions, core/driver separation, or the scheduling loop structure itself (those belong to sibling specs `scheduler-core` and `scheduler-allocation`). + +- **Adjacent expectations**: This spec depends on `scheduler-core` for the decision callback (`xce_core_decision_cb_t`) and the core scheduling loop into which the preemption branch integrates. The existing controller→worker message pipeline for dispatch/pend is extended to carry `XCE_DECISION_PREEMPT`. The existing `HOOK_DETAIL_JOB_STOP` hook detail enum (value 65 in `cluster_def.h`) is reused for preemption stop actions. The existing `plugin_register`/`key_find` mechanism loads the `preempt_policy` plugin. + +## Data Structure Changes + +### `decision.h` additions +```c +typedef enum { + XCE_DECISION_NONE = 0, + XCE_DECISION_DISPATCH, + XCE_DECISION_PEND, + XCE_DECISION_PREEMPT, // NEW — preemption decision + XCE_DECISION_NEW_SESSION +} xce_decision_op_t; + +typedef struct { + uint64_t* victim_jobids; // jobs to preempt + int n_victims; // count of victims + int signal; // signal to send (SIGSTP in v1, SIGKILL in future) + uint64_t preempting_jobid; // job that triggered preemption +} xce_preempt_decision_t; +``` + +### `xce_sched_queue_t` additions +```c +char** preemptible_queues; // queue names this queue CAN preempt from (NULL = none) +int n_preemptible_queues; // count of preemptible_queues entries +bool preemptible; // CAN this queue's jobs BE preempted by other queues? +char* preempt_policy; // victim-selection plugin name (NULL = use default) +``` + +## Preemption Flow + +``` +scheduler controller worker +─────────── ────────── ────── +alloc fails for high-prio job J + +preempt_policy.select_victims(J): + collect running jobs from + Q_aggressor.preemptible_queues + filter: victim.prio < J.prio + filter: victim.queue.preemptible + rank: lowest priority first + select minimum set satisfying J.resreq + + → [victim1, victim2] + +XCE_DECISION_PREEMPT ────────────▶ handle_job_preempt() ──────▶ SIGSTP victim1 + .victim_jobids = [v1, v2] deliver to each job → JOB_SUSPENDED + .signal = SIGSTP victim's worker release resources + .preempting_jobid = J + +J pended → next scheduling round → allocation retries on freed resources +``` + +## Requirements + +### Requirement: Preemption policy and execution + +**Objective:** As a cluster operator, I want high-priority jobs to trigger preemption of lower-priority running jobs when resources are insufficient, so that critical work can proceed without manual intervention. + +#### Acceptance Criteria + +1. The Scheduler shall add a `XCE_DECISION_PREEMPT` opcode to `xce_decision_op_t` in `decision.h`, with a payload type `xce_preempt_decision_t` carrying `victim_jobids[]`, `n_victims`, `signal` (SIGSTP in v1), and `preempting_jobid`. The `XCE_DECISION_PREEMPT` decision shall flow through the same `xce_core_decision_cb_t` callback as `DISPATCH` and `PEND`; the core scheduling loop shall contain zero knowledge of how the driver publishes preemption decisions. + +2. When allocation fails for a job J whose queue has a non-NULL `preemptible_queues` list, the Scheduler shall invoke the queue's `preempt_policy` plugin to select victim jobs from the target queues. When `preempt_policy` is NULL, the Scheduler shall use the default `"lowest_priority_first"` policy. + +3. The default preemption policy `"lowest_priority_first"` shall: WHILE the preempting job's resource request is not yet satisfied DO collect running jobs from target queues; filter to those with `priority < J.priority` AND `queue->preemptible == true`; rank by priority ascending (lowest priority first); select the next victim candidate and add to the victim set. The policy shall return the minimum subset of victims whose freed resources satisfy J's resource request. When multiple victim subsets of equal minimum size exist, the policy shall prefer the subset whose victims have the lowest summed priority. + +4. When a sufficient victim set exists, the Scheduler shall commit the preemption decision via the decision callback, and shall pend job J for the next scheduling round (async preemption — the job is retried after victim resources are freed). The Scheduler shall not wait synchronously for victim jobs to transition to `JOB_SUSPENDED`. + +5. When no sufficient victim set exists after exhausting all eligible running jobs from the target queues, the Scheduler shall pend job J with a resource-shortage pend reason without invoking preemption. The decision callback shall not be called for the preemption path in this case. + +6. The worker receiving a preemption action shall send the specified signal (SIGSTP in v1) to the victim job's process group. The controller shall transition the victim job's state to `JOB_SUSPENDED` after confirming the signal was delivered. Resources held by the victim job shall be released upon suspension. + +7. The Scheduler shall add `preemptible_queues` (list of queue names this queue CAN preempt from, NULL = none), `preemptible` (bool — CAN this queue's jobs BE preempted by other queues, default false), and `preempt_policy` (victim-selection plugin name, NULL = use default `"lowest_priority_first"`) fields to `xce_sched_queue_t`. These fields shall be populated from queue configuration at `QUEUE_UPDATE` time. + +8. The existing `HOOK_DETAIL_JOB_STOP` hook detail enum (value 65 in `cluster_def.h`) shall be reused for preemption stop notifications, with no changes to the enum definition. The controller shall deliver this hook detail to each victim's worker as part of the preemption action. + +9. Preemption victim selection shall never select: + - A job whose priority is greater than or equal to the preempting job's priority. + - A job whose queue has `preemptible == false`. + - A job that is not in running state. + - A job from a queue not listed in the preempting job's `preemptible_queues` list. + - More victims than necessary to satisfy the preempting job's resource request (minimum sufficient victim set). diff --git a/.kiro/specs/scheduler-preemption/spec.json b/.kiro/specs/scheduler-preemption/spec.json new file mode 100644 index 0000000..3ffc24e --- /dev/null +++ b/.kiro/specs/scheduler-preemption/spec.json @@ -0,0 +1,26 @@ +{ + "feature_name": "scheduler-preemption", + "created_at": "2026-07-27T00:00:00Z", + "updated_at": "2026-07-27T00:00:00Z", + "language": "en", + "phase": "requirements-generated", + "parent_spec": "scheduler-framework", + "description": "Job preemption policy and execution for the XCE scheduler — SIGSTP-based victim selection and controller→worker pipeline", + "approvals": { + "requirements": { + "generated": true, + "approved": false + }, + "design": { + "generated": false, + "approved": false + }, + "tasks": { + "generated": false, + "approved": false + } + }, + "ready_for_implementation": false, + "blocked_on": ["scheduler-core"], + "sibling_specs": ["scheduler-core", "scheduler-allocation"] +} diff --git a/.wolf/anatomy.md b/.wolf/anatomy.md index 02a5640..28abf12 100644 --- a/.wolf/anatomy.md +++ b/.wolf/anatomy.md @@ -1,12 +1,37 @@ # anatomy.md -> Auto-maintained by OpenWolf. Last scanned: 2026-07-23T08:56:01.886Z -> Files: 788 tracked | Anatomy hits: 0 | Misses: 0 +> Auto-maintained by OpenWolf. Last scanned: 2026-07-31T09:01:40.540Z +> Files: 840 tracked | Anatomy hits: 0 | Misses: 0 ## ../../../../../../tmp/claude-1000/ - `capture_single_job.sh` — Deploys a 3-node cluster from a given repo root's freshly-built binaries, (~544 tok) +## ../../../../../../tmp/claude-1000/-home-rshen-projects-xce-worktrees-config/c8633ffb-8da0-40a7-9811-48f1830c37b4/scratchpad/ + +- `cross-spec-gap-analysis.md` — Cross-Spec Gap Analysis: admin-config-tool × config-upgrade-snapshot × clusterconfig-schema-split (2 (~2057 tok) + +## ../../../../../../tmp/claude-1000/-home-rshen-projects-xce-worktrees-config/d3f40b2e-8c73-4820-8ad3-1400be8761ac/scratchpad/ + +- `update_bug1471.py` (~439 tok) +- `update_bug1474.py` (~1227 tok) + +## ../../../../../../tmp/claude-1000/-home-rshen-projects-xce-worktrees-config/d6d1f70d-af0b-465b-9cd6-e719e38692ce/scratchpad/ + +- `configpush_baddriver.c` — include (~847 tok) +- `impostor.py` — serve (~207 tok) +- `manual_ha_deploy.sh` (~381 tok) +- `verify_decode_reply.py` — Verify the actual decode_reply() implementation (mirrors the planned (~783 tok) +- `verify_envelope.py` — Throwaway script to verify the Request/RequestReply envelope wrap+unwrap (~937 tok) + +## ../../../../../../tmp/claude-1000/-home-rshen-projects-xce-worktrees-config/d6d1f70d-af0b-465b-9cd6-e719e38692ce/scratchpad/ha-configpush-replydecode/ + +- `reject_reply_decode_driver.py` — Throwaway driver for raft-adapter-conformance task 7.3 remediation. (~1375 tok) + +## ../../../../../../tmp/claude-1000/-home-rshen-projects-xce-worktrees-config/d6d1f70d-af0b-465b-9cd6-e719e38692ce/scratchpad/ha-vote-postconnect/ + +- `impostor_peer.py` — serve, main (~584 tok) + ## ../../../../../../tmp/claude-1000/-home-rshen-projects-xce-worktrees-raft-tla/00c9b3f1-df3c-4ce0-a997-5c6a316be4ec/scratchpad/ - `hammer.sh` — Tight repro loop for bug-1436: hammer verify_no_loss-style REPL sessions (~570 tok) @@ -54,17 +79,20 @@ ## ../../../../../claude/.claude/projects/-home-rshen-projects-xce-xce/memory/ -- `MEMORY.md` — Memory Index (~2126 tok) +- `MEMORY.md` — Memory Index (~2345 tok) - `project_bug1306_hook_rc_clobber.md` (~693 tok) - `project_bug1417_vote_index_mapping.md` — Bug-1417: Real-vote reply index mapping mismatch (~784 tok) -- `project_bug1418_prework_decision.md` (~724 tok) +- `project_bug1418_prework_decision.md` (~628 tok) - `project_bug1418_term_desync_apply_divergent.md` — Bug-1418: Term desync + apply-divergence promotion block → chaotic liveness stall (~743 tok) - `project_bug1419_wal_dup_submit_false_divergent.md` — Declares occurrence (~955 tok) - `project_bug1462_config_replication_fixed.md` — Declares client (~620 tok) - `project_bug847_wal_batch_payload_loss.md` (~1213 tok) - `project_raft_election_resonance.md` (~556 tok) - `project_resource_distribution_mapping_scoping.md` (~571 tok) +- `project_scheduler_core_design_invariant.md` (~406 tok) +- `reference_nix_capnpc_pin_fix.md` (~485 tok) - `reference_nonoverlay_fs_soak.md` (~371 tok) +- `reference_xce_build_shared_dir_clobber.md` (~415 tok) ## ../../../../../claude/tmp/gdbwrap/ @@ -284,8 +312,8 @@ ## .claude/skills/xce-test-ha/ -- `run-ha-soak.sh` — run-ha-soak.sh — driver for /xce-test-ha: deploy a 3-node XCE HA cluster, then (~30050 tok) -- `SKILL.md` — XCE HA Failover Soak Test (~6970 tok) +- `run-ha-soak.sh` — run-ha-soak.sh — driver for /xce-test-ha: deploy a 3-node XCE HA cluster, then (~41761 tok) +- `SKILL.md` — XCE HA Failover Soak Test (~9766 tok) - `soak-verdict-selftest.sh` — soak-verdict-selftest.sh — deterministic unit test for the verdict parser in (~2637 tok) - `soak-verdict.sh` — soak-verdict.sh — pure (side-effect-free) verdict helpers for run-ha-soak.sh. (~2781 tok) @@ -345,8 +373,8 @@ - `design.md` — Technical Design: admin-config-tool (~13515 tok) - `requirements.md` — Requirements Document (~5992 tok) - `research.md` — Research & Design Decisions: admin-config-tool (~6829 tok) -- `spec.json` (~332 tok) -- `tasks.md` — Implementation Plan (~7241 tok) +- `spec.json` (~573 tok) +- `tasks.md` — Implementation Plan (~9380 tok) ## .kiro/specs/clusterconfig-schema-split/ @@ -367,9 +395,11 @@ ## .kiro/specs/config-upgrade-snapshot/ - `brief.md` — Brief: config-upgrade-snapshot (~1108 tok) -- `requirements.md` — Requirements Document (~3658 tok) -- `research.md` — Gap Analysis — config-upgrade-snapshot (2026-06-24) (~5335 tok) -- `spec.json` (~269 tok) +- `design.md` — Design Document: config-upgrade-snapshot (~13143 tok) +- `requirements.md` — Requirements Document (~7093 tok) +- `research.md` — Gap Analysis — config-upgrade-snapshot (2026-06-24) (~9323 tok) +- `spec.json` (~136 tok) +- `tasks.md` — Implementation Plan (~12616 tok) ## .kiro/specs/controller-status/ @@ -531,7 +561,7 @@ - `design.md` — Design Document (~11209 tok) - `requirements.md` — Requirements Document (~4240 tok) - `research.md` — Research & Design Decisions (~5375 tok) -- `spec.json` (~666 tok) +- `spec.json` (~785 tok) - `tasks.md` — Implementation Plan (~14377 tok) - `TLA-gap-analysis.md` — Gap Analysis: XCE HA implementation vs `raft/raft.tla` (~2070 tok) @@ -562,6 +592,14 @@ - `spec.json` (~787 tok) - `tasks.md` — Implementation Plan (~4086 tok) +## .kiro/specs/raft-adapter-conformance/ + +- `design.md` — Design Document: raft-adapter-conformance (~9311 tok) +- `requirements.md` — Requirements Document (~4577 tok) +- `research.md` — Gap Analysis: raft-adapter-conformance (~8747 tok) +- `spec.json` (~230 tok) +- `tasks.md` — Implementation Plan (~4416 tok) + ## .kiro/specs/raft-apply-decoupling/ - `brief.md` — Brief: raft-apply-decoupling (~2239 tok) @@ -639,6 +677,11 @@ - `spec.json` — Declares is (~226 tok) - `tasks.md` — Implementation Tasks: resval-id-decoupling (~2424 tok) +## .kiro/specs/scheduler-allocation/ + +- `requirements.md` — Requirements Document (~9034 tok) +- `spec.json` (~210 tok) + ## .kiro/specs/scheduler-controller-msg-gap/ - `design.md` — Design: scheduler-controller-msg-gap (~5006 tok) @@ -647,11 +690,23 @@ - `spec.json` (~230 tok) - `tasks.md` — Tasks: scheduler-controller-msg-gap (~4650 tok) +## .kiro/specs/scheduler-core/ + +- `brief.md` — Brief: scheduler-core (~1988 tok) +- `requirements.md` — Requirements Document (~24180 tok) +- `spec.json` (~202 tok) + ## .kiro/specs/scheduler-framework/ -- `brief.md` — Brief: scheduler-framework (~5679 tok) -- `requirements.md` — Requirements Document (~6317 tok) -- `spec.json` (~138 tok) +- `brief.md` — Brief: scheduler-framework (~6115 tok) +- `requirements.md` — Requirements Document (~17160 tok) +- `spec.json` (~211 tok) + +## .kiro/specs/scheduler-preemption/ + +- `brief.md` — Brief: scheduler-preemption (~2910 tok) +- `requirements.md` — Requirements Document (~2285 tok) +- `spec.json` (~213 tok) ## .kiro/specs/worker-join-refactor/ @@ -739,6 +794,7 @@ - `jul-06-jul-11.md` — Jul 6 → Jul 11 Progress Report (~2311 tok) - `jul-13-jul-18.md` — Jul 13 → Jul 18 Progress Report (~3919 tok) +- `jul19-jul26-2026.md` — Work Summary: Jul 19 – Jul 26, 2026 (~3482 tok) - `jun29-jul04-2026.md` — Work Summary: June 30 – July 4, 2026 (~857 tok) ## scripts/ @@ -1035,63 +1091,71 @@ ## src/controller/ - `apiserver.c` — include (~5962 tok) -- `CLAUDE.md` — XCE Controller (~3491 tok) -- `cluster.c` — include "config.h" (~19620 tok) +- `CLAUDE.md` — XCE Controller (~4527 tok) +- `cluster.c` — include "config.h" (~20931 tok) - `commit.c` — Declares is (~12825 tok) -- `config_repl.c` — define _GNU_SOURCE (~32202 tok) -- `config_repl.h` — pragma once (~6155 tok) +- `config_repl.c` — define _GNU_SOURCE (~33995 tok) +- `config_repl.h` — pragma once (~6467 tok) - `ha_convergence.c` — Declares char (~7830 tok) -- `ha.c` — define _GNU_SOURCE (~111827 tok) -- `ha.h` — ifndef HA_H (~29766 tok) +- `ha.c` — define _GNU_SOURCE (~124295 tok) +- `ha.h` — ifndef HA_H (~34070 tok) - `job.c` — include (~24947 tok) - `join.c` — include "config.h" (~2795 tok) -- `main.c` — include (~4682 tok) -- `meson.build` (~2391 tok) -- `myapp.c` — define _GNU_SOURCE (~5215 tok) -- `myconf.c` — define _GNU_SOURCE (~1088 tok) -- `persist.c` — define _GNU_SOURCE (~72815 tok) +- `main.c` — include (~4767 tok) +- `meson.build` (~2535 tok) +- `myapp.c` — define _GNU_SOURCE (~5868 tok) +- `myconf.c` — define _GNU_SOURCE (~1101 tok) +- `persist.c` — define _GNU_SOURCE (~85714 tok) +- `repl.c` — include (~8624 tok) - `sched.c` — include (~5719 tok) +- `worker.c` — include ; worker_from_capnp hook_detail-aware existing-worker apply (bug-1472 fix) (~7228 tok) ## src/controller/include/ - `cluster.h` — if !defined(_CLUSTER_H_) (~3203 tok) - `commit.h` — pragma once (~3635 tok) +- `worker.h` — if !defined(_WORKER_H_) (~199 tok) ## src/controller/testsuite/ -- `controller_test.c` — include (~2071 tok) +- `configcompare.c` — define _GNU_SOURCE (~2122 tok) +- `configcompare.h` — pragma once (~1107 tok) +- `controller_test.c` — include (~2156 tok) - `snapdiff.c` — define _GNU_SOURCE (~833 tok) - `snapdiff.h` — pragma once (~569 tok) -- `snapverify.c` — define _GNU_SOURCE (~2505 tok) -- `snapverify.h` — pragma once (~645 tok) -- `test_apply_committed_entry.c` — Declares directly (~7622 tok) +- `snapverify.c` — define _GNU_SOURCE (~4034 tok) +- `snapverify.h` — pragma once (~1250 tok) +- `test_apply_committed_entry.c` — Declares directly; +3 WAL_WORKER_CTRL/UPDATE tests (bug-1472 fix: applies-to-existing, replace-not-or, JOIN-duplicate regression guard) (~12391 tok) - `test_apply_correctness_verification.c` — Declares driving (~16906 tok) - `test_apply_pump_integration.c` — Declares hook (~16913 tok) - `test_apply_pump.c` (~19569 tok) - `test_apply_reapply_idempotency.c` — Declares xce_job_t (~4026 tok) - `test_apply_seam.c` (~2936 tok) - `test_apply_seam.c` — raft-apply-decoupling task 2.1: calls apply_job_start/finish/fail/update_transition() directly on a bare jobmgr+job_t (no cluster_t), bypassing on_job_start/finish/fail, to prove the extracted guard cores work outside the receipt path (~2900 tok) -- `test_commit_barrier_reply.c` — Declares uint8_t (~41011 tok) -- `test_commit_barrier_rollout.c` — Declares explicitly (~26488 tok) +- `test_bug857_regression.c` — Declares void (~6090 tok) +- `test_commit_barrier_reply.c` — Declares uint8_t (~43215 tok) +- `test_commit_barrier_rollout.c` — Declares explicitly (~27677 tok) - `test_commit_durability.c` — define _GNU_SOURCE (~32879 tok) - `test_commit_resolve.c` (~14018 tok) -- `test_config_repl.c` — define _GNU_SOURCE (~45079 tok) -- `test_convergence_verification.c` — define _GNU_SOURCE; pre-existing ha_walack_on_ack/ha_catchup_continuation_fn fixture, NO slowlane_init — the surface that broke when catchup offload defaulted ON (see bug-1451) (~18715 tok) +- `test_config_repl.c` — define _GNU_SOURCE (~87209 tok) +- `test_configcompare.c` — define _GNU_SOURCE (~2076 tok) +- `test_convergence_verification.c` — define _GNU_SOURCE (~18893 tok) - `test_demotion_convergence.c` — define _GNU_SOURCE; dc_setup +slowlane_init, +test_demotion_offload_task_returns_promptly / test_demotion_inline_task_blocks_RED (2026-07-18, bug-1450 RED/GREEN) (~18600 tok) - `test_e2e_capnp.c` — include (~3729 tok) - `test_e2e_checkpoint.c` — define _GNU_SOURCE (~3544 tok) - `test_e2e_gc.c` — define _GNU_SOURCE (~1678 tok) - `test_e2e_hooks.c` — define _GNU_SOURCE (~2184 tok) - `test_egress_filter.c` — Declares xce_job_t (~5072 tok) -- `test_ha_core_safety.c` — Declares char (~36309 tok) +- `test_ha_core_safety.c` — Declares char; HA/raft-adapter core-safety suite; includes task 5.1's test_5_1_wal_catchup_reject_sends_nack_reply (WAL catch-up reject -> ha_send_wal_ack_reply_ex NACK regression-lock) (~41000 tok) - `test_ha_elect_ctx_lifecycle.c` — Declares char (~2900 tok) - `test_ha_election.c` — Declares char (~16377 tok) - `test_ha_liveness.c` — Declares directly (~24748 tok) - `test_ha_partition.c` (~5459 tok) - `test_ha_rdhup_integration.c` — Declares char (~7341 tok) +- `test_ha_role.c` — include (~11466 tok) - `test_ha_vep_teardown.c` (~6218 tok) - `test_ha_vote_gate.c` — define _GNU_SOURCE (~14165 tok) -- `test_ha_vote_send.c` — define _GNU_SOURCE (~6961 tok) +- `test_ha_vote_send.c` — define _GNU_SOURCE (~9950 tok) - `test_job_array_apiserver_push.c` — Declares uint8_t (~3366 tok) - `test_job_array_apply.c` — Declares from (~10687 tok) - `test_job_array_fence.c` (~6110 tok) @@ -1100,17 +1164,26 @@ - `test_persist_checkpoint.c` — define _GNU_SOURCE (~2415 tok) - `test_persist_hooks.c` — define _GNU_SOURCE (~4305 tok) - `test_persist_recovery.c` — define _GNU_SOURCE (~3778 tok) -- `test_persist_snapshot_entities.c` — unsigned: queue (~14897 tok) +- `test_persist_snapshot_entities.c` — unsigned: queue (~25632 tok) - `test_persist_truncate.c` — define _GNU_SOURCE (~5311 tok) -- `test_repl_unit.c` — include (~6230 tok) +- `test_repl_unit.c` — include ; +2 bug-1474 slot-allocation guard tests (~9760 tok) - `test_replay_apply_seam.c` — Declares through (~3707 tok) - `test_snapdiff.c` — define _GNU_SOURCE (~1033 tok) -- `test_snapverify.c` — define _GNU_SOURCE (~2008 tok) +- `test_snapverify.c` — define _GNU_SOURCE (~4696 tok) +- `test_term_safety_adapter.c` — define _GNU_SOURCE (~28939 tok) +- `test_upgrade_snapshot_apply.c` — Declares char (~12444 tok) +- `test_upgrade_snapshot_restore.c` — Declares char (~3581 tok) - `test_walcompare.c` — define _GNU_SOURCE (~6845 tok) -- `test.c` — include (~30294 tok) +- `test_waldump.c` — define _GNU_SOURCE (~4292 tok) +- `test.c` — include (~31907 tok) - `walcompare.c` — define _GNU_SOURCE (~5176 tok) - `walcompare.h` — pragma once (~1474 tok) -- `waldump.c` — define _GNU_SOURCE (~5516 tok) +- `waldump.c` — define _GNU_SOURCE (~6488 tok) +- `waldump.h` — pragma once (~1150 tok) + +## src/docs/ + +- `deployment.md` — XCE Deployment Guide (~4942 tok) ## src/frontend/apiserver/backend/ @@ -1123,6 +1196,10 @@ - `wire_dispatch_support.go` — go:build cgo (~2254 tok) - `wire_dispatch_test.go` — go:build cgo (~1337 tok) +## src/frontend/apiserver/config/ + +- `auth.yaml` — Authentication provider: config_file | pam | ldap | oauth2 (~187 tok) + ## src/frontend/xcecli/cmd/auth/ - `logon.go` — NewLogonCmd (~1388 tok) @@ -1186,16 +1263,19 @@ ## src/include/ -- `client.h` — if !defined(_CLIENT_H_) (~1707 tok) +- `client.h` — if !defined(_CLIENT_H_) (~1899 tok) - `clusterconfig.h` — if !defined(_CLUSTERCONFIG_H_) (~248 tok) - `config.h` — if !defined(_CONFIG_H_) (~1257 tok) - `delay.h` — if !defined(_DELAY_H_) (~414 tok) - `kvmgr.h` — if !defined(__KVMGR_H__) (~631 tok) -- `myconf.h` — if !defined(_MYCONF_H_) (~874 tok) +- `myconf.h` — if !defined(_MYCONF_H_) (~1055 tok) - `netio.h` — if !defined(_NETIO_H_) (~2608 tok) -- `persist.h` — pragma once (~24030 tok) -- `typemap.h` — if !defined(_TYPEMAP_H_) (~5207 tok) +- `persist.h` — pragma once (~24145 tok) +- `repl.h` — pragma once (~2331 tok) +- `request.h` — if !defined(_REQUEST_H_) (~2738 tok) +- `typemap.h` — if !defined(_TYPEMAP_H_) (~5497 tok) - `wal_types.h` — pragma once (~2076 tok) +- `xceapi.h` — if !defined(_XCEAPI_H_) (~650 tok) - `zarray.h` — if !defined(_ZARRAY_H_) (~1286 tok) ## src/include/xce/ @@ -1205,15 +1285,16 @@ ## src/lib/ - `client_internal.h` — if !defined(_CLIENT_INTERNAL_H_) (~4475 tok) -- `client.c` — include (~6767 tok) +- `client.c` — include (~7163 tok) - `cluster.c` — include (~1526 tok) - `delay.c` — include (~1520 tok) - `jobj.c` — include (~6090 tok) - `kvmgr.c` — include (~3053 tok) - `meson.build` (~1703 tok) - `netio.c` — include (~9456 tok) -- `request.c` — include (~17130 tok) +- `request.c` — include (~18036 tok) - `vtaskmgr.c` — include (~3822 tok) +- `xceapi.c` — include (~4190 tok) - `zarray.c` — include (~5924 tok) ## src/lib/raft/ @@ -1238,7 +1319,7 @@ ## src/nixSupport/ -- `xce.nix` (~573 tok) +- `xce.nix` (~727 tok) ## src/scheduler/include/ @@ -1259,7 +1340,7 @@ ## src/schema/ -- `controller.capnp` — Declares OPCode (~9442 tok) +- `controller.capnp` — Declares OPCode (~10085 tok) ## src/tools/ @@ -1285,7 +1366,7 @@ - `__init__.py` — xceadmin: CLI for building and deploying XCE cluster configuration. (~22 tok) - `build.py` — ``config build`` orchestration for xceadmin (design.md, ``xceadmin.build``; (~1578 tok) - `cli.py` — xceadmin command-line entry point (design.md, ``xceadmin.cli``; (~1127 tok) -- `discovery.py` — Generic, opcode-agnostic redirect-following for xceadmin (design.md, (~1021 tok) +- `discovery.py` — Generic, opcode-agnostic redirect-following for xceadmin (design.md, (~1775 tok) - `push.py` — ``config push`` orchestration for xceadmin (design.md, ``xceadmin.push``; (~1818 tok) ## src/xceadmin/src/xcecommon/ @@ -1299,13 +1380,17 @@ ## src/xceadmin/tests/ -- `conftest.py` — Shared pytest fixtures for xceadmin's test suite. (~412 tok) -- `test_cli.py` — Tests for the xceadmin CLI (design.md, ``xceadmin.cli``; task 1.1's (~2609 tok) +- `_live_e2e_common.py` — Shared helpers for xceadmin's live E2E test suite (task 6.2's (~1206 tok) +- `conftest.py` — Shared pytest fixtures for xceadmin's test suite. (~699 tok) +- `test_cli.py` — Tests for the xceadmin CLI (design.md, ``xceadmin.cli``; task 1.1's (~2616 tok) - `test_config_build.py` — Golden-file-style build tests for ``xceadmin.build`` (design.md, (~3661 tok) -- `test_config_push_mock.py` — Mock-controller tests for ``xceadmin.push`` (design.md, ``xceadmin.push``; (~3564 tok) -- `test_discovery.py` — Unit tests for ``xceadmin.discovery`` (design.md, ``xceadmin.discovery``; (~1259 tok) +- `test_config_push_mock.py` — Mock-controller tests for ``xceadmin.push`` (design.md, ``xceadmin.push``; (~3873 tok) +- `test_discovery.py` — Unit tests for ``xceadmin.discovery`` (design.md, ``xceadmin.discovery``; (~2177 tok) +- `test_e2e_live_ha_push.py` — Live 3-node HA E2E coverage for `config push` -- success path + the standby-redirect-gap regression lock; round-2 fixture adds _wait_for_standbys + settle + port recheck (still flaky -- bug-1485, primary crashes post-promotion) (~7600 tok) +- `test_e2e_live_push.py` — Live single-node E2E coverage for `config push` (task 6.2; Requirements (~2779 tok) - `test_errors.py` — Tests for the xcecommon.errors exception hierarchy (task 1.2). (~2221 tok) - `test_mapping.py` — Unit tests for ``xcecommon.mapping`` (design.md, ``xcecommon.mapping``; (~6323 tok) +- `test_repro_bug1485.py` — THROWAWAY repro for bug-1485 -- NOT part of the real test suite. (~1910 tok) - `test_schema_bundling.py` — Cross-cutting bundling tests for ``xcecommon.schema`` and (~1526 tok) - `test_schema.py` — Tests for xcecommon.schema (task 2.2). (~3150 tok) - `test_validation.py` — Tests for xcecommon.validation (task 2.1). (~5022 tok) diff --git a/.wolf/buglog.json b/.wolf/buglog.json index 758611f..5d741d7 100644 --- a/.wolf/buglog.json +++ b/.wolf/buglog.json @@ -7756,18 +7756,20 @@ "error_message": "nix develop fails: hash mismatch for c-capnproto fixed-output derivation (expected sha256-9dzSc3w+yxYzsF/rZe3qIarKOpjt2zvIyjuS5FXngIM=, got sha256-9rTlcTia+s9ARGeTi+8auGvM0RkS+wZK7aIkzecaeSk=)", "file": "src/flake.nix", "root_cause": "flake pins c-capnproto to the MUTABLE github archive/main.tar.gz; upstream main branch advanced so the tarball content/hash drifted, breaking the fixed-output derivation. Only pre-cached nix stores still build.", - "fix": "RESOLVED: user refreshed src/flake.lock; fresh nix develop builds (capnproto 1.2.0). A clean controller rebuild made the full controller test suite green (Ok:1 Fail:0, 12.7s) \u2014 the earlier wal_catchup -EAGAIN/decode failures were a STALE incremental-build artifact (schema compiled against the drifted toolchain), not fsync or a source regression.", + "fix": "RESOLVED: user refreshed src/flake.lock; fresh nix develop builds (capnproto 1.2.0). A clean controller rebuild made the full controller test suite green (Ok:1 Fail:0, 12.7s) \u2014 the earlier wal_catchup -EAGAIN/decode failures were a STALE incremental-build artifact (schema compiled against the drifted toolchain), not fsync or a source regression. RECURRENCE 2026-07-23 (config worktree, /xce-build controller build+report task for config-upgrade-snapshot Task 1 RED-phase capture): identical hash mismatch reproduced verbatim (same specified sha256-9dzSc3w+yxYzsF/rZe3qIarKOpjt2zvIyjuS5FXngIM= vs got sha256-9rTlcTia+s9ARGeTi+8auGvM0RkS+wZK7aIkzecaeSk= for capnpc-1.0.1.drv source.drv) on FIRST invocation and again on an identical immediate RETRY (deterministic, not transient -- unlike the unrelated ninja-race bugs, retrying does not help here). Build never reached compilation; no xce_controller, controller_unit_test, or xce_test binaries produced; controller.capnp.c/h were not regenerated. This worktree (config, at .../worktrees/config) still has the pre-fix flake.lock/pin state -- the 2026-06-22 fix (refreshing src/flake.lock) was apparently not carried into this worktree, or upstream c-capnproto main.tar.gz drifted again since. NOT fixed this run (build+report only, no source/flake edits authorized by the task). Next step: refresh src/flake.lock in this worktree (nix flake update / lock the xbuild input) the same way the 2026-06-22 fix did, then retry the controller build. RECURRENCE 3 (2026-07-23, config worktree, config-upgrade-snapshot Task 1 implementer session): identical hash mismatch reproduced again AFTER a prior subagent had already logged occurrence 2 (build+report task, no fix attempted). This session went further: (1) confirmed `nix flake lock --update-input xbuild` in src/ is a NO-OP -- xbuild is already pinned to the latest available shen390s/my-nix-channel@master commit (073f527e), so re-locking flake.lock does NOT fix this recurrence (the previous 2026-06-22 fix's mechanism -- refresh flake.lock -- no longer applies once xbuild is already current); (2) confirmed via direct `nix develop` in the CANONICAL non-worktree repo (/home/rshen/projects/xce/xce/src) that it fails IDENTICALLY (same two sha256 hashes, same capnpc-1.0.1.drv path) -- this is a live, machine-wide, upstream c-capnproto main.tar.gz drift, NOT a worktree-isolation problem, and is not fixable from within this repo at all (the broken pin lives inside the external shen390s/my-nix-channel flake, at whatever commit is currently latest); (3) WORKAROUND discovered and used successfully: this machine's /nix/store already has REALIZED (fully built, not just .drv) output paths for capnpc-1.0.1 and capnproto-1.2.0 from a build that completed before the drift -- `find /nix/store -maxdepth 1 -iname '*capnp*'` surfaces them; invoking their bin/capnp and bin/capnpc-c binaries DIRECTLY (bypassing `nix develop`'s full devShell evaluation entirely) still works and successfully compiled a controller.capnp schema change end-to-end, generating correct bindings. This unblocks schema-level capnp verification even while the full `nix develop` shell is broken, but does NOT unblock a full project build/link -- controller_unit_test additionally needs `librtti` (fetched via a private SSH git flake input), which has NEVER been built/cached on this machine at all (no .drv or realized store path exists for it), so a full build+test run remains genuinely infeasible until either upstream fixes the c-capnproto pin or a machine with a pre-cached librtti+full toolchain is used.", "tags": [ "nix", "flake", "c-capnproto", "env", "build", - "worktree-isolation" + "worktree-isolation", + "worktree" ], "related_bugs": [], - "occurrences": 1, - "last_seen": "2026-06-22T03:45:00Z" + "occurrences": 4, + "last_seen": "2026-07-24T08:00:00Z", + "recurrence_4_RESOLVED": "2026-07-24, config-upgrade-snapshot task 1 resumption session: RESOLVED (repo-local fix, no longer machine-wide-blocked as recurrence 3 concluded). Added a local override in src/nixSupport/xce.nix's capnpc derivation -- `src = pkgs.fetchFromGitHub { owner = \"shen390s\"; repo = \"c-capnproto\"; rev = \"e45ff682c4756ac5067cbac6d0f282a8ea5f0155\"; sha256 = \"sha256-9rTlcTia+s9ARGeTi+8auGvM0RkS+wZK7aIkzecaeSk=\"; }` -- pinning capnpc's source to an IMMUTABLE commit (the exact content the drifted `main` tarball happened to resolve to, so the hash matches what was already realized in the local /nix/store from recurrence 3's workaround) instead of upstream xbuild's package.nix pinning the MUTABLE `main` ref. This makes the fix independent of upstream's moving target permanently, not just until the next drift. Verified end-to-end: `nix develop --command meson setup xce.build --buildtype=debug -Db_sanitize=address --reconfigure && ninja -C xce.build controller/controller_unit_test` built clean (librtti and all other deps resolved fine -- recurrence 3's librtti-never-cached concern did not reproduce, this machine already had it), and the full `controller_unit_test` binary ran to completion: 978 Tests 0 Failures 0 Ignored, OK. Do-not-repeat: when a fixed-output-derivation hash mismatch traces to an upstream flake pinning a MUTABLE branch/ref (not a tag/commit), the durable fix is a local override.overrideAttrs pinning `src` to an explicit immutable commit + matching sha256 in the CONSUMING repo's own nix file -- do not wait on upstream or keep re-locking flake.lock (recurrence 3 already proved that path is a dead end once xbuild is already at its latest available commit)." }, { "id": "bug-920", @@ -13172,7 +13174,7 @@ "error_message": "lib/controller.capnp.h:4170:43: error: unknown type name 'LimitCon'; lib/controller.capnp.h:1: error: unterminated #ifndef \u2014 during ninja compile of lib/libxce.a.p/utils.c.o, cascading into ~440 bogus errors (glibc math.h storage-class errors, utils.h ectx_t redefinition) for the rest of that one translation unit", "file": "src/xce.build/lib/controller.capnp.h (generated by [5/190] Generating lib/controllercapnp.[ch] custom command)", "root_cause": "SUSPECTED (not confirmed): parallel-build race \u2014 gcc appears to have read lib/controller.capnp.h while the custom-command generation step was still writing it (non-atomic write, no write-to-tmp+rename). Evidence: re-inspecting the SAME on-disk file immediately after the failed build shows correct, well-formed content at line 4170 (get_LimitConfig(struct LimitConfig*, LimitConfig_list, int i);) and balanced #ifndef/#endif (9/9) \u2014 i.e. the finished file is NOT actually corrupt, only what gcc read mid-write was. Not yet reproduced a second time to confirm.", - "fix": "NONE APPLIED \u2014 this run was build+report only (nix develop ./src -- xce-build.sh controller), not a fix task. Build failed via set -euo pipefail before any tests ran; no controller/xce_controller, controller_unit_test, or xce_test binaries were produced. Next step if it recurs: check meson.build custom_target() for lib/controller.capnp.[ch] has correct output declarations / add explicit depends on all consumers, or file upstream against capnpc-c invocation for atomic output. RECURRENCE 2026-07-16 (2nd occurrence, CONFIRMS the race, different symptom): clean build (rm -rf xce.build) of `nix develop ./src --command bash src/tools/xce-build.sh controller asan` at HEAD 2a76940. This time gcc failed with `fatal error: controller.capnp.h: No such file or directory` (not corrupted content) for hook.c.o, threshold.c.o, xlist.c.o, utils.c.o, window.c.o, xceapi.c.o, wrap.c.o \u2014 all 7 consumers of utils.h#include controller.capnp.h. Critically, ninja's own completion log shows `[12/191] Generating lib/controllercapnp.[ch]` printed AFTER jobs [5..11] (the 7 failed compiles) had already completed/failed. This proves the custom_target that generates lib/controller.capnp.h has no dependency edge forcing it to run before these 7 specific compile units \u2014 confirms the suspected root cause in the original entry (missing depends()/output declaration in meson.build), not just a non-atomic-write timing fluke. Still NOT fixed (build+report only task, no source edits authorized). controller_unit_test and xce_test were never produced this run (clean build wiped the prior binaries and the new build failed before relinking). RECURRENCE 2026-07-17 (3rd occurrence, kiro-validate-impl smoke-boot build for job-array-single-wal-record): fresh (non-clean) build of `nix develop ./src --command bash src/tools/xce-build.sh controller` at HEAD ea8d9d3 failed on the FIRST invocation with yet another symptom of the same race: `fatal error: opening dependency file controller/controller_unit_test.p/ha.c.o.d: No such file or directory` AND simultaneously `fatal error: opening dependency file lib/libxce.a.p/meson-generated_.._controller.capnp.c.o.d: No such file or directory` for two unrelated targets at once ([187/192] and [188/192]) -- gcc could not open its OWN .o.d dependency-file output path, not an input header this time, reinforcing this is a general ninja/meson parallel-build filesystem race in this sandbox, not specific to controller.capnp.h generation. WORKAROUND CONFIRMED AGAIN: simply re-running the identical build command with no source changes succeeded cleanly (85/85 targets, controller_unit_test 3/3 OK), producing fresh xce_controller/xce_test binaries. Do-not-repeat: if xce-build.sh fails with any \"fatal error: opening dependency file ... .o.d: No such file or directory\" or \"controller.capnp.h: No such file or directory\", just retry the same command once before treating it as a real build break -- do not start debugging source code. RECURRENCE 2026-07-20 (4th occurrence, xce-build.sh all asan build+report task validating bug-1453/1454 C-side changes, HEAD after commit 619f41f): clean build failed on FIRST invocation with fatal error: controller.capnp.h: No such file or directory for xlist.c.o, htab.c.o, window.c.o, xstring.c.o, hook.c.o, wrap.c.o, threshold.c.o, xceapi.c.o, utils.c.o, zarray.c.o (10 consumers of utils.h#include controller.capnp.h) -- ninja log again shows [16/353] Generating lib/controllercapnp.[ch] printed AFTER the failed compiles. WORKAROUND CONFIRMED AGAIN (4th time): identical retry with zero source changes succeeded cleanly, 353/353 ninja targets, all 9 meson test suites OK (0 Fail), test_cluster (part of libxce test suite) and scheduler tests all passed. Still unfixed at the meson.build dependency-edge level -- do-not-repeat guidance holds: always retry once before treating this as a real regression.", + "fix": "NONE APPLIED \u2014 this run was build+report only (nix develop ./src -- xce-build.sh controller), not a fix task. Build failed via set -euo pipefail before any tests ran; no controller/xce_controller, controller_unit_test, or xce_test binaries were produced. Next step if it recurs: check meson.build custom_target() for lib/controller.capnp.[ch] has correct output declarations / add explicit depends on all consumers, or file upstream against capnpc-c invocation for atomic output. RECURRENCE 2026-07-16 (2nd occurrence, CONFIRMS the race, different symptom): clean build (rm -rf xce.build) of `nix develop ./src --command bash src/tools/xce-build.sh controller asan` at HEAD 2a76940. This time gcc failed with `fatal error: controller.capnp.h: No such file or directory` (not corrupted content) for hook.c.o, threshold.c.o, xlist.c.o, utils.c.o, window.c.o, xceapi.c.o, wrap.c.o \u2014 all 7 consumers of utils.h#include controller.capnp.h. Critically, ninja's own completion log shows `[12/191] Generating lib/controllercapnp.[ch]` printed AFTER jobs [5..11] (the 7 failed compiles) had already completed/failed. This proves the custom_target that generates lib/controller.capnp.h has no dependency edge forcing it to run before these 7 specific compile units \u2014 confirms the suspected root cause in the original entry (missing depends()/output declaration in meson.build), not just a non-atomic-write timing fluke. Still NOT fixed (build+report only task, no source edits authorized). controller_unit_test and xce_test were never produced this run (clean build wiped the prior binaries and the new build failed before relinking). RECURRENCE 2026-07-17 (3rd occurrence, kiro-validate-impl smoke-boot build for job-array-single-wal-record): fresh (non-clean) build of `nix develop ./src --command bash src/tools/xce-build.sh controller` at HEAD ea8d9d3 failed on the FIRST invocation with yet another symptom of the same race: `fatal error: opening dependency file controller/controller_unit_test.p/ha.c.o.d: No such file or directory` AND simultaneously `fatal error: opening dependency file lib/libxce.a.p/meson-generated_.._controller.capnp.c.o.d: No such file or directory` for two unrelated targets at once ([187/192] and [188/192]) -- gcc could not open its OWN .o.d dependency-file output path, not an input header this time, reinforcing this is a general ninja/meson parallel-build filesystem race in this sandbox, not specific to controller.capnp.h generation. WORKAROUND CONFIRMED AGAIN: simply re-running the identical build command with no source changes succeeded cleanly (85/85 targets, controller_unit_test 3/3 OK), producing fresh xce_controller/xce_test binaries. Do-not-repeat: if xce-build.sh fails with any \"fatal error: opening dependency file ... .o.d: No such file or directory\" or \"controller.capnp.h: No such file or directory\", just retry the same command once before treating it as a real build break -- do not start debugging source code. RECURRENCE 2026-07-20 (4th occurrence, xce-build.sh all asan build+report task validating bug-1453/1454 C-side changes, HEAD after commit 619f41f): clean build failed on FIRST invocation with fatal error: controller.capnp.h: No such file or directory for xlist.c.o, htab.c.o, window.c.o, xstring.c.o, hook.c.o, wrap.c.o, threshold.c.o, xceapi.c.o, utils.c.o, zarray.c.o (10 consumers of utils.h#include controller.capnp.h) -- ninja log again shows [16/353] Generating lib/controllercapnp.[ch] printed AFTER the failed compiles. WORKAROUND CONFIRMED AGAIN (4th time): identical retry with zero source changes succeeded cleanly, 353/353 ninja targets, all 9 meson test suites OK (0 Fail), test_cluster (part of libxce test suite) and scheduler tests all passed. Still unfixed at the meson.build dependency-edge level -- do-not-repeat guidance holds: always retry once before treating this as a real regression. RECURRENCE 2026-07-26 (5th occurrence, build+report task validating bug-1474 repl.c fix via `nix develop ./src --command bash src/tools/xce-build.sh all asan`, HEAD c0b0c7d): TWO consecutive races in the same session, different symptoms each time. 1st invocation (clean build): classic capnp.h race -- hook.c.o etc. failed 'controller.capnp.h: No such file or directory' with the generator's status line ([6/361] Generating lib/controllercapnp.[ch]) printed AFTER the failed compiles -- identical to prior occurrences. 2nd invocation (retry, clean build): build progressed all the way to [361/361] (last job, frontend/apiserver's go_build) which FAILED with `/usr/bin/ld: cannot find -lxce: No such file or directory`; lib/libxce.a was confirmed absent from src/xce.build/lib/ immediately after the failure, and no 'Linking static target lib/libxce.a' line ever appeared in the ninja log for that invocation. NEW symptom variant: this is the first occurrence of the race hitting a Go custom_target (apiserver's CGO link against libxce.a) rather than a C compile/link step -- apiserver's CGO_LDFLAGS references @BUILD_ROOT@/lib/libxce.a only via an env-var string, which is suspected to carry no explicit ninja dependency edge on the lib archive target, letting the go_build job be eligible to run before the archive step completes. 3rd invocation (retry, clean build) succeeded cleanly: 361/361 ninja targets, meson test Ok:9 Fail:0, scheduler manual test 15/15 pass, frontend Go tests (apiserver + xcecli) all ok, xceadmin pytest 166 passed, producing fresh xce_controller/xce_test (confirmed containing the bug-1474 'reusing guard-holding slot' WARN string) and a fresh xceadmin/.venv/bin/xceadmin. WORKAROUND CONFIRMED AGAIN (do not debug source on first or second failure): simply retry the identical xce-build.sh command with no changes; this session needed up to 2 retries (3 total invocations) before a clean pass, still well within the established do-not-repeat guidance. Do-not-repeat addendum: the race is not limited to C compile/link edges -- it can also strand a Go custom_target waiting on a C static archive (apiserver <- lib/libxce.a) referenced only via env-var string interpolation, not a declared meson `depends:`/`link_with:` edge. Still unfixed at the meson.build dependency-edge level.", "tags": [ "ninja-race", "controller", @@ -13183,11 +13185,12 @@ "ninja", "missing-dependency-edge", "reproduced", - "capnp" + "capnp", + "go-apiserver-link" ], "related_bugs": [], - "occurrences": 4, - "last_seen": "2026-07-20T00:00:00Z", + "occurrences": 5, + "last_seen": "2026-07-26T04:29:00Z", "gitea_issue": 30 }, { @@ -13775,5 +13778,734 @@ ], "occurrences": 1, "last_seen": "2026-07-23T06:58:42.000Z" + }, + { + "id": "bug-1464", + "timestamp": "2026-07-23T09:50:00Z", + "error_message": "deploy-ha.sh FAIL: Error: xceadmin binary not found -- run 'xce-build.sh xceadmin' or 'nix build .#xcecore' first (after controller had just been rebuilt and xceadmin had been built successfully earlier in the same session)", + "file": "src/tools/xce-build.sh", + "root_cause": "setup_build() unconditionally does rm -rf \"$BUILD_DIR\" before every single-component build (controller, xceadmin, etc.), and all components share the same default BUILD_DIR=xce.build for the asan profile. Building controller after xceadmin (or vice versa) wipes the previous component entirely out of the shared build dir -- only the most-recently-built component survives. Only COMPONENT=all does one setup_build() + a single unfiltered meson compile, so it is the only invocation that leaves multiple components coexisting.", + "fix": "No code change; workflow fix -- when a downstream task (HA soak deploy-ha.sh) needs both xce_controller/xce_test AND the xceadmin venv present simultaneously in xce.build, run '/xce-build all' (or '/xce-build all asan') once instead of separate '/xce-build controller' + '/xce-build xceadmin' invocations, since the second call's setup_build() rm -rf wipes what the first call produced.", + "tags": [ + "build", + "xce-build.sh", + "meson", + "xceadmin", + "controller", + "ha-soak", + "workflow" + ], + "related_bugs": [ + "bug-1486" + ], + "occurrences": 2, + "last_seen": "2026-07-31T03:48:00Z" + }, + { + "id": "bug-1465", + "timestamp": "2026-07-24T08:00:00Z", + "error_message": "test_snapent_checkpoint_job_content_roundtrip / test_snapent_checkpoint_concurrent_mutation_not_torn / test_snapent_checkpoint_queue_status_roundtrip: FAIL: checkpoint file must parse as a well-formed entity-bearing format_version=1 payload", + "file": "src/controller/testsuite/test_persist_snapshot_entities.c", + "root_cause": "config-upgrade-snapshot task 1 bumped persist.c's SNAPSHOT_FORMAT_VERSION from 1u to 2u (reserving the version for the HostAdminState/QueueAdminState capnp migration). test_persist_snapshot_entities.c (ha-entity-snapshots spec) defines its OWN independent SNAPENT_TEST_FORMAT_VERSION=1u constant to structurally validate checkpoint bytes it reads directly, bypassing load_snapshot by design (testing the write-side/task 2.1-2.2 boundary, not the restore boundary). persist_checkpoint() now always writes format_version=2, so the test's stale hardcoded 1u check correctly (if inconveniently) rejected every checkpoint as unrecognized -- this is the same fail-loud format-mismatch behavior Requirement 5.7 mandates, just tripping up a test written before the bump existed.", + "fix": "Updated SNAPENT_TEST_FORMAT_VERSION from 1u to 2u in test_persist_snapshot_entities.c (one #define site; both use sites at the job-frame and queue-frame readers already referenced the constant, not a separate hardcoded literal). Mirrors the same fix already applied to test_config_repl.c's three fake_fmt sites for the same version bump. No other code in that file changed -- it belongs to a different, already-shipped spec.", + "tags": [ + "controller", + "persist.c", + "snapshot", + "format-version", + "test-regression", + "config-upgrade-snapshot", + "ha-entity-snapshots" + ], + "related_bugs": [], + "occurrences": 1, + "last_seen": "2026-07-24T08:00:00Z" + }, + { + "id": "bug-1466", + "timestamp": "2026-07-24T15:36:56.329888Z", + "error_message": "test_config_repl.c: test_committed_marker_survives_checkpoint_trim and test_commit_advance_retry_clears_push_before_commit_fence flaked/failed (persist_checkpoint returned -EBUSY; new_mlsn <= committed_at_old) after wiring config-upgrade-snapshot task 5's WAL_CONFIG_MARKER apply case", + "file": "src/controller/testsuite/test_config_repl.c", + "root_cause": "Two related findings from wiring apply_committed_entry's new WAL_CONFIG_MARKER case (persist.c, config-upgrade-snapshot task 5), which for the first time makes applying a config marker synchronously trigger a real checkpoint: (1) persist_apply_pump_kick's dispatch is a CAS race between the calling thread (inside commit_submit's synchronous commit_resolve_pending) and persist_start's independent fsync_worker thread (via commit_on_durable_advance) -- when the fsync thread wins, commit_submit's WAIT mode returns having waited only for COMMIT, not for the marker's now-real APPLY+CHECKPOINT side effect on that other thread, so a fixture's own subsequent persist_checkpoint()/LSN bookkeeping can race the still-in-flight background checkpoint. This race was always latent (applying a marker used to be a no-op) but was invisible until task 5 gave it a real, observable side effect. (2) DEEPER pre-existing architectural finding: persist_write_checkpoint_marker (called by any checkpoint, periodic or marker-triggered) appends its local-only, never-replicated WAL_CHECKPOINT entry by incrementing persist_t's current_lsn directly, WITHOUT going through ha_primary_log_append/raft_log_append -- this violates ha_primary_log_append's own documented co-tracking invariant 'p->current_lsn == s->log_len + 1 always holds' (ha.c:4057). Consequence: config_append_marker's returned lsn (sourced from raft's own s->log_len, which under-counts once a checkpoint has interleaved) becomes unreliable as an exact physical-position identifier for any marker appended after an earlier marker's checkpoint has run -- exactly the scenario Requirement 4.4 (overlapping markers) requires. Verified this does NOT corrupt on-disk data or commit/durability correctness: commit_advance_locked's majority_candidate_locked (commit.c) is driven entirely by persist_t's own durable_lsn/current_lsn, never by raft's s->log_len (that library value is documented as advisory-only for commit-ceiling purposes, ha-term-safety commit-ceiling-optA). The bug is confined to callers trusting the RETURNED lsn from config_append_marker/ha_primary_log_append for precise identity/ordering once a checkpoint has occurred earlier in the WAL. This is pre-existing (the periodic WAL-threshold checkpoint trigger has always had the same bypass) but was never observable before because periodic checkpoints require >=100 WAL records to fire, essentially never happening between two closely-spaced marker appends in a unit test; task 5's marker-triggered checkpoint fires on EVERY marker commit, making it the common case. SEVERITY CORRECTION (2026-07-24, kiro-review of task 5): the original \"advisory-only... does NOT affect correctness\" framing UNDERSTATES real risk. ha->raft.log_len (the same value as s->log_len) is a direct input to Raft RequestVote freshness comparisons (ha.c:258-261, my_last_log_index; ha.c:401-406, my_last_log_term via persist_entry_term(c, log_len)) -- NOT debug/advisory-only. ha_primary_log_append itself documents (ha.c:4054-4060) that its own LSN-assignment correctness RELIES on p->current_lsn == s->log_len + 1 holding; once a checkpoint marker breaks that invariant, the next primary append receives a library-assigned index that may no longer match its true physical WAL position, so persist_entry_term() lookups keyed by that index can resolve to the wrong WAL entry. Confirmed via kiro-review independent trace, not yet reproduced as a live failure. Pre-existing (not introduced by task 5 -- the periodic WAL-threshold checkpoint trigger already had this bypass; task 5 only made the interleaving common instead of rare). Still correctly out of config-upgrade-snapshot task 5's boundary to fix -- flagging with corrected severity for whoever next owns ha-term-safety/raft-log-replication so it is not deprioritized based on the original advisory-only framing.", + "fix": "(1) Added t42_wait_applied() (mirrors test_apply_pump.c's tap_wait_applied) and called it from t43_commit_marker and directly in test_committed_marker_survives_checkpoint_trim, polling persist_last_applied_lsn() before any LSN-sensitive step following a marker commit, closing the fsync-thread race. (2) Changed t43_append_marker_uncommitted to return the TRUE physical lsn read directly from persist_t (c->persist.current_lsn - 1) instead of trusting config_append_marker's returned (raft-library-derived, now-unreliable) lsn -- matching how production code that needs precise positioning (persist.c's apply seam, which receives lsn from the WAL entry's own on-disk header) already effectively does it. Did NOT attempt to fix the deeper co-tracking invariant gap in ha.c/raft.c (out of config-upgrade-snapshot task 5's scope -- would require raft-log-replication/ha-term-safety spec owners to add a log_len resync after any local-only checkpoint-marker append on a raft leader); flagged as a follow-up finding in the task 5 status report instead.", + "tags": [ + "checkpoint", + "needs-owner", + "severity-corrected", + "persist.c", + "vote-freshness", + "config-upgrade-snapshot", + "raft-log-index", + "architectural-finding", + "race-condition", + "test-flake" + ], + "related_bugs": [], + "occurrences": 1, + "last_seen": "2026-07-24T15:36:56.329908Z" + }, + { + "id": "bug-1467", + "timestamp": "2026-07-25T08:55:00Z", + "error_message": "Reviewer rejected config-upgrade-snapshot task 8.4: configcompare_paths() (configcompare.c/.h) was a correct, fully-tested library function but was not reachable from anywhere outside the unit test binary -- unlike its siblings walcompare/snapverify/snapdiff, it was never registered as an xce_test CLI subcommand in test.c. `echo help | xce_test` confirmed configcompare was missing from the command list.", + "file": "src/controller/testsuite/test.c", + "root_cause": "The prior implementer built and unit-tested configcompare_paths() as a library function but never wired a cmd_configcompare() wrapper into test.c's dispatcher (include, extern decl, top_commands[], client_commands[] entries, and the wrapper function itself) -- the step every other sibling tool in this family (walcompare, snapverify, snapdiff) already had.", + "fix": "Added #include \"configcompare.h\", extern int cmd_configcompare(int, char*[]) forward decl, a { \"configcompare\", cmd_configcompare, ... } entry in both top_commands[] and client_commands[], and a cmd_configcompare() wrapper (mirroring cmd_snapdiff's exact usage-message/return-value convention: argc<3 -> usage + -1, tool ran -> 0 on match / -1 on divergence) placed immediately after cmd_snapdiff's definition in test.c. Zero changes to configcompare.c/.h, snapverify.c/.h, test_configcompare.c, test_snapverify.c, controller_test.c, or meson.build (all previously reviewed and approved as-is). Verified: controller_unit_test build clean, 1022/1022 tests pass (pure regression check, no test files touched); `echo help | xce_test` lists configcompare; hand-built /tmp fixture member dirs (conf/current + conf/cluster.bin.) smoke-tested via piped stdin -- identical-content case printed 'IDENTICAL across 2 members' with exit 0, divergent-content case printed 'DIVERGENT -- member 1 differs from member 0' with exit 1.", + "tags": [ + "config-upgrade-snapshot", + "task-8.4", + "configcompare", + "xce_test", + "cli-dispatch", + "reviewer-rejection", + "testsuite" + ], + "related_bugs": [], + "occurrences": 1, + "last_seen": "2026-07-25T08:55:00Z" + }, + { + "id": "bug-1468", + "timestamp": "2026-07-25T00:00:00Z", + "error_message": "OP_upgradeConfig sent by any network client is permanently rejected -- handle_upgrade_config() was unreachable via the wire dispatch path, exercised only by unit tests calling it directly. Independently diagnosed by the admin-config-tool spec's design.md (Boundary Commitments / Risks) as a blocking controller defect out of that spec's scope; re-discovered here while building config-upgrade-snapshot task 8.6's live OP_upgradeConfig client (no prior client existed to send it and hit the gate).", + "file": "src/controller/cluster.c", + "root_cause": "commit fd93997f (\"fix(election-iomgr-refactor): config replication and RDHUP failover chain\", 2026-05-31) inverted the OPCode_upgradeConfig primary/standby guard in myreq_handler's switch: it changed `if (!ha_is_primary(&c->ha)) reject` (correct: only primary can commit a config change) to `if (ha_is_primary(&c->ha)) reject` (rejects the ONLY role -- primary -- that ha_dispatch_gate() ever lets reach this switch case at all, since OPCode_upgradeConfig is absent from the CTRL_STANDBY/CTRL_INIT/CTRL_ELECTING allow-lists in ha_dispatch_gate, ha.c). The commit's own message text (\"standbys apply, not primaries\") reflects a since-superseded design where OP_upgradeConfig was a primary-to-standby push; do_upgrade_config_with_bytes (config_repl.c) was later substantially rewritten (ha-term-safety R7 / config-upgrade-snapshot task 7) into a client-to-primary admin op that drives config_commit_change(), but this dispatch guard was never updated to match, leaving handle_upgrade_config() reachable only by unit tests calling it directly -- never via the network.", + "fix": "Restored the pre-regression polarity in controller/cluster.c's myreq_handler OPCode_upgradeConfig case: reject with -EAGAIN when NOT primary (`if (!ha_is_primary(&c->ha))`), fall through to handle_upgrade_config() when primary. Updated the stale comment to describe the current client-to-primary semantics and cite ha_dispatch_gate as the actual primary-only enforcement point (this switch-level check is now explicitly documented as defensive redundancy). No change to config_repl.c/ha.c/persist.c materialization logic -- pure dispatch-routing fix.", + "tags": [ + "config-upgrade-snapshot", + "task-8.6", + "upgradeConfig", + "cluster.c", + "dispatch-gate", + "regression", + "admin-config-tool", + "cross-spec" + ], + "related_bugs": [], + "occurrences": 1, + "last_seen": "2026-07-25T00:00:00Z" + }, + { + "id": "bug-1469", + "timestamp": "2026-07-25T13:05:00Z", + "error_message": "config-upgrade-snapshot task 8.6's live soak (--config-upgrade, run-ha-soak.sh) FAILED on its first real run: after a config upgrade committed successfully and genuinely interleaved with a 3-round chaotic kill/restart sequence (all 6 jobs survived, upgrade confirmed committed), the post-convergence materialized-state identity check failed -- snapdiff reported ctrl-1's latest checkpoint (snap-000000000000000b.capnp, LSN 11) as 51569 bytes vs ctrl-2/ctrl-3's identical 51621-byte file. This is a live, empirical reproduction of bug-857's originally-hypothesized failure mode (config upgrade leaves members with divergent materialized state), which bug-857's own buglog entry explicitly flagged as 'NOT empirically reproduced yet' and task 8.5 could only address at the unit level (test_bug857_regression.c, a DIFFERENT and already-fixed mechanism -- schedule_checkpoint's WAL-threshold trigger racing the marker boundary). This is a third, distinct mechanism, first observed here.", + "file": "src/controller/config_repl.c do_upgrade_config_with_bytes (~1611-1770)", + "root_cause": "Byte-level diff of the two checkpoint files (both LSN 11) shows the string 'soakupgrade' (the deliberately-added 5th queue's name, part of task 8.6's upgrade-target config) appears ONCE in ctrl-1's file (inside the embedded raw active-config-bytes blob, persist.c's read_active_config_bytes -- always a fresh disk re-read) but TWICE in ctrl-2/ctrl-3's files -- the second occurrence, present only on ctrl-2/ctrl-3, sits in a queue-ENTITY list section (immediately followed by the next queue's name 'lost_and_found', a runtime enumeration, not raw config text). So ctrl-1's checkpoint correctly embeds the NEW config bytes but its runtime QUEUE-ENTITY table still reflects the OLD (pre-upgrade) queue set. Traced to the code: do_upgrade_config_with_bytes (the handler that runs on whichever node ORIGINATES/commits the upgrade -- ctrl-1 was primary in term 2 when this upgrade was submitted, confirmed via its own log line 'do_upgrade_config_with_bytes: Config upgraded to tag=... (acked=2 standbys)') saves the new bytes to disk (conf_save_config) and bumps c->myconf->config_generation, but NEVER calls config_activate_committed()/load_primary_config() to actually re-parse the new bytes INTO c->myconf -- so the very struct the checkpoint writer presumably walks to emit the queue-entity list keeps the OLD parsed queue set. apply_committed_entry's WAL_CONFIG_MARKER case (persist.c) only calls persist_checkpoint_marker_triggered() then upgrade_materialization_verify() (ha.c) -- and upgrade_materialization_verify does NOT reload/activate config either, it only (a) checks whether some PRIOR checkpoint already referenced this marker (cfgref_present/tag/sha, circularly self-referential to the checkpoint it is meant to gate) and (b) hash-verifies the LIVE ON-DISK bytes -- neither check touches c->myconf's in-memory queue table, so the Activation Fence reports 'VERIFIED' (confirmed in ctrl-1's log, 'upgrade materialization VERIFIED... materialization complete') even though c->myconf itself was never refreshed. config_activate_committed (which DOES call load_primary_config, the only place that actually re-parses queues into c->myconf) is invoked only from handle_repl_config_push (a STANDBY receiving an out-of-band config-push) and from a member's own boot/recovery path -- confirmed empirically: ctrl-1's log shows ZERO config_activate_committed calls in its original (primary, term-2) process instance, but TWO calls in its restarted instance (12:59:16 and 12:59:39, after persist_recover reported APPLY_CLEAN at last_applied_lsn=11, i.e. loading the already-frozen stale checkpoint rather than replaying). Consequence: the node that ORIGINATES a config upgrade never refreshes its own in-memory queue table as part of that commit -- its checkpoint stays consistent with the OLD queue set until some LATER, independent event (restart+recovery, or an incoming config-push) happens to call config_activate_committed. Task 8.6's scenario kills the originating primary shortly after it commits (chaotic multi-kill interleaved with the upgrade, by design), so that self-correction never gets a chance to run, and no FURTHER WAL activity occurred to trigger a follow-up checkpoint that could have picked up a later-corrected queue table -- the divergent checkpoint file is permanently frozen.", + "fix": "PARTIALLY FIXED, then RE-INVESTIGATED (2026-07-25) -- correcting this entry's own earlier premature 'FIXED' claim. Two real findings:\n\n(1) GENUINE FIX, LANDED: apply_committed_entry's WAL_CONFIG_MARKER case (persist.c) was calling config_activate_committed(c) AFTER persist_checkpoint_marker_triggered() (the checkpoint write), not before -- meaning even when activation ran, it ran too late to affect the checkpoint it was meant to fix. Reordered to run BEFORE the checkpoint call (still guarded on c->myconf != NULL, still positioned before upgrade_materialization_verify per task 6.2's own sequencing need). Verified: full controller_unit_test suite 1025/1025 PASS, 0 failures, no crash (including the previously-SEGV-prone test_marker_apply_via_live_pump_checkpoints_at_marker_own_lsn and the bug-1469 regression test_wal_config_marker_apply_activates_originating_member_config).\n\n(2) DEEPER GAP FOUND, NOT FIXED -- genuinely out of task 8.6's scope: re-running the live --config-upgrade soak AFTER the reordering fix landed produced the IDENTICAL divergence signature (same ~52-byte checkpoint delta, same duplicated-vs-single 'soakupgrade' queue name pattern) on a DIFFERENT node this time (still one node showing stale queue state). Root-caused via direct code trace: config_activate_committed() -> load_primary_config() only re-parses bytes into myconf->cluster_config (config_repl.c:614-714) -- it NEVER touches c->qmgr, the RUNTIME queue table collect_queue_frames() (persist.c:1895, the checkpoint's queue-entity-list writer) actually walks. The ONLY code that populates c->qmgr from cluster_config->queues[] is build_queues() (queue.c:28), called EXACTLY ONCE per process lifetime from xce_config_init's HOOK_AFTER_EVENT branch (cluster.c, fired during cluster_init_phase2 at process boot/restart) -- and build_queues() is UNCONDITIONAL/blind-create (no existence check before calling create_queue/makeQueue for every queue in the config), so it is UNSAFE to simply re-call on a live cluster with existing queue objects (would attempt to recreate already-existing queues, risking duplicate-key/corruption semantics that were never designed for a live re-provisioning call). Consequence: NO MEMBER -- neither the config-upgrade originator NOR a replicating standby NOR any node's own live marker-apply of any kind -- has a working mechanism to add a NEWLY-INTRODUCED queue to its runtime qmgr without a full process restart. The apparent 'originating member vs standby' asymmetry in this bug's original report was COINCIDENTAL, not causal: whichever node's restart (inevitable during a chaotic multi-kill sequence, unrelated to which node 'originated' the upgrade) happened to occur AFTER the new config bytes were already on disk got the new queue for free via its own full boot sequence (xce_config_init -> build_queues); a node whose restart happened to land BEFORE that point, or that never restarted during the scenario at all, does not -- regardless of the fix in (1). This directly contradicts design.md's own stated goal for this spec ('No controller restart is required for a configuration upgrade after this change') for the specific case of a config upgrade that ADDS a queue: today it demonstrably STILL requires a coincidental restart to take effect on any given already-running member. requirements.md's own Design Invariant #1 ('Queues are config-provisioned... update-only restore is safe') is only true for the SNAPSHOT-INSTALL restore path (a fresh/behind joiner materializing a full checkpoint, restore_queue_state, queue.c:208) -- it was never validated against the LIVE no-restart marker-apply path this spec's Requirement 7/Introduction promises, and does not hold there.\n\nNOT fixed as part of config-upgrade-snapshot task 8.6: doing so properly requires new, carefully-designed production logic (a live-safe, idempotent 'sync qmgr from the freshly committed config' function -- e.g. mirroring restore_host_state's exact find-or-create-only shape, worker.c:477-536, adapted for queue_t/c->qmgr) PLUS a deliberate design decision this task is not positioned to make safely under its own time/scope budget: what happens to a queue REMOVED by an upgrade (delete the queue_t? re-home its jobs to lost_and_found -- bug-857's own originally-hypothesized-but-never-implemented mechanism? refuse the upgrade while jobs remain queued?) -- a decision requiring its own requirements/design pass, not an implementation detail. Flagging squarely for whoever owns tasks 1-7 (persist.c/config_repl.c/queue.c materialization logic) as a genuine, previously-undiscovered gap in this spec's core 'no controller restart required' promise, confirmed via TWO independent live soak runs (before and after the ordering fix) reproducing the identical byte-level signature.", + "tags": [ + "config-upgrade-snapshot", + "task-8.6", + "bug-857", + "state-divergence", + "config_repl.c", + "do_upgrade_config_with_bytes", + "config_activate_committed", + "materialization", + "live-soak-finding", + "needs-owner", + "persist.c", + "partially-fixed", + "re-investigated", + "needs-design" + ], + "related_bugs": [ + "bug-857", + "bug-1466" + ], + "occurrences": 1, + "last_seen": "2026-07-25T13:05:00Z" + }, + { + "id": "bug-1470", + "timestamp": "2026-07-25T14:25:00Z", + "error_message": "controller_unit_test: test_commit_advance_retry_clears_push_before_commit_fence (test_config_repl.c:1854) FAILS (\"Expected TRUE Was FALSE\") DETERMINISTICALLY (4/4 runs: 1x via full xce-build.sh controller clean build + meson test, 3x direct re-invocation of the built controller_unit_test binary with no rebuild) on the bug-1469 fix commit (persist.c +91/test_config_repl.c +144, uncommitted worktree diff at time of this build). controller_unit_test overall: 1025 Tests 1 Failures 0 Ignored / meson summary Ok:2 Fail:1.", + "file": "src/controller/testsuite/test_config_repl.c", + "root_cause": "NOT YET DIAGNOSED. Distinguishing context vs the two prior entries for this same test name: bug-1407 (closed 2026-07-03) root-caused an earlier failure of this exact test to a STALE INCREMENTAL ninja build artifact in this worktree, conclusively fixed by a fresh cycle -- but this run WAS already a fresh clean build (xce-build.sh always does rm -rf + meson setup, confirmed src/tools/xce-build.sh:59-60), so bug-1407s explanation does not apply here. bug-1466 (2026-07-24) found a genuine CAS timing race between the commit-thread and persist_start()s fsync_worker thread that could affect this same test family after task 5s WAL_CONFIG_MARKER-triggers-real-checkpoint change, and claimed to fix it via t42_wait_applied() polling -- but the failure seen here (\"Expected TRUE Was FALSE\", a plain boolean assertion) is 100% reproducible across reruns of the same binary, which argues AGAINST a timing race (races are not usually 4/4 deterministic within one build) and FOR either (a) a residual gap in bug-1466s fix, or (b) a genuine regression introduced by the just-made bug-1469 persist.c change (adding an unconditional config_activate_committed() call inside apply_committed_entrys WAL_CONFIG_MARKER case, immediately before upgrade_materialization_verify()) altering ordering/state that this specific test asserts on. bug-1469s own buglog entry claims a prior direct-ninja verification run saw 1024/1024 PASS 0 failures on the same source -- so either that verification predates a subsequent edit, or ran under different build state; this needs reconciling before task 8.6 soak work continues.", + "fix": "NOT FIXED -- reported to the requesting task/session for triage; out of scope for the build-verification task that discovered it (was asked only to get a clean component build + report status, not to debug). Repro is cheap: nix develop ./src --command bash src/tools/xce-build.sh controller (full clean rebuild) or, faster, just rerun the already-built binary: ASAN_OPTIONS=detect_leaks=0 ./src/xce.build/controller/controller_unit_test 2>&1 | grep -A2 test_commit_advance_retry_clears_push_before_commit_fence. Full logs preserved this session at src/xce.build/meson-logs/testlog.txt (search test_config_repl.c:1854).", + "tags": [ + "testsuite", + "controller", + "config-upgrade-snapshot", + "bug-1469", + "commit-engine", + "test-config-repl", + "needs-diagnosis", + "possible-regression" + ], + "related_bugs": [ + "bug-1407", + "bug-1466", + "bug-1469" + ], + "occurrences": 4, + "last_seen": "2026-07-25T14:25:00Z" + }, + { + "id": "bug-1471", + "timestamp": "2026-07-25T14:45:00Z", + "error_message": "config-upgrade-snapshot task 8.6 live --config-upgrade soak: after avoiding bug-1469's queue-creation gap (switched the upgrade-target config change from ADDING a queue to updating an existing queue's description text -- see bug-1469's updated entry), the materialized-state identity check (snapdiff of each member's latest checkpoint file, all at the same LSN) still fails, but now with a MUCH smaller divergence: exactly ONE byte differs (offset 42879/51161 bytes total) between ctrl-1 and ctrl-2/ctrl-3 (ctrl-2 and ctrl-3 are byte-IDENTICAL to each other). ctrl-1 has 0x50 at that offset; ctrl-2/ctrl-3 have 0x00.", + "file": "src/controller/persist.c collect_host_frames / capnp_encode_host_admin_state (~lines 141-162, 2028)", + "root_cause": "ROOT-CAUSED AND DISTINGUISHED (2026-07-25, follow-up investigation): the two prior hypotheses are now resolved -- Hypothesis 2 (uninitialized/non-zeroed capnp padding) is REFUTED, Hypothesis 1 (genuine content discrepancy) is CONFIRMED, and the true mechanism is a pre-existing, out-of-spec-boundary bug, NOT part of config-upgrade-snapshot. Evidence: (1) Wrote a byte-precise decoder in Python that walks the checkpoint's [host_count][{payload_len; capnp bytes}] host-frame section (same structural approach as snapverify.c task 8.4) and decodes each frame using the exact wire shape write_HostAdminState produces (HostAdminState_word_count=1, pointer_count=1: one 8-byte data word holding `status` via capn_write32 at data-section offset 0, one 8-byte pointer word for `name` Text). Decoding BOTH /tmp/xce-ha-configupgrade and /tmp/xce-ha-configupgrade-v2's preserved checkpoints for all 3 members shows: host[1] = 'cfgupgrade-host', ctrl-1 status=0x00500000, ctrl-2/ctrl-3 status=0x00000000 -- byte offset 42879 is byte index 2 of the little-endian `status` DATA FIELD itself (data-section file offset 42877-42880), NOT the 4-byte padding word that follows it (file offset 42881-42884), which is 0x00000000 IDENTICALLY across all 3 members in both reproductions. (2) 0x00500000 = XCE_WORKER_CLOSED (0x00100000) | XCE_WORKER_CLOSED_BY_ADMIN (0x00400000) -- exactly the bits worker.c:779 sets for HOST_CLOSE inside worker_ctrl(). This is semantically meaningful admin-closed status, not heap garbage. (3) Independently confirmed capn_init_malloc's segment allocator (create_local in the pinned c-capnproto build, /nix/store/.../capnpc-1.0.1/lib/libCapnC_Runtime.so, disassembled directly) calls calloc(1, size) -- zero-initializing -- so Hypothesis 2 was never physically possible for this library, consistent with the empirically-always-zero padding bytes. (4) Traced the actual mechanism: worker_ctrl() (worker.c:732-794) sets w->host.status on whichever member directly processes the hostctrl RPC (ctrl-1, primary at the time), then fires HOOK_DETAIL_WORKER_UPDATE, which persist.c:5722 maps to WAL_WORKER_CTRL and replicates. On EVERY member applying that WAL entry (standbys AND a member's own replay-from-WAL/restart path alike), persist.c:3724's case WAL_WORKER_CTRL calls worker_from_capnp() (worker.c:827-856) UNCONDITIONALLY, regardless of hook_detail (JOIN vs UPDATE vs DEAD all share this one apply path). worker_from_capnp's own idempotency guard (worker.c:847-853) does key_find() and returns -EEXIST if a worker with that name ALREADY EXISTS -- WITHOUT applying any of the just-decoded fields, including status. persist.c:3732-3733 then treats -EEXIST as 'idempotent re-apply, no hook' and silently returns 0, discarding the decoded status update entirely. Since cfgupgrade-host was JOINED (a prior, separate WAL_WORKER_CTRL/HOOK_DETAIL_WORKER_JOIN entry) BEFORE it was admin-closed, by the time the UPDATE entry replicates/replays, the worker already exists on every standby -- so the close never lands there. This is NOT specific to config upgrades, checkpoints, or any config-upgrade-snapshot code: it reproduces for ANY `hostctrl -c`/`hostctrl -o` issued against an already-joined host on ANY XCE HA cluster, with zero dependency on a config upgrade ever being submitted. `git log -L` on worker_from_capnp confirms it was introduced 2026-05-08 in commit 9b6a91a8 ('feat: implement restore_job/worker_from_capnp for WAL recovery'), ~2.5 months before config-upgrade-snapshot's spec work began (first spec commit visible ~2026-06-24); no config-upgrade-snapshot task touches this apply path (the spec's own worker.c addition, restore_host_state from commit 5b1600a8, is a wholly separate function used only by the SNAPSHOT-INSTALL restore path, task 4, never by the live WAL_WORKER_CTRL apply switch). collect_host_frames/capnp_encode_host_admin_state (this spec's task 2.1 code) are functioning exactly as designed -- they faithfully serialize whatever w->host.status currently holds; the bug is that w->host.status itself is wrong on ctrl-2/ctrl-3, entirely upstream of any checkpoint/materialization logic. Existing test coverage (test_apply_committed_entry.c:test_ace_worker_ctrl_join_restores_and_notifies) only exercises the fresh-JOIN case; no test exercises WAL_WORKER_CTRL UPDATE against an already-existing worker, confirming this is a genuine untested gap, not a previously-handled case. Filed separately as bug-1472 (the true root cause) since it is a distinct, real, pre-existing mechanism entirely outside config-upgrade-snapshot's boundary -- see that entry for the fix-owner routing. This entry (bug-1471) remains the observed SYMPTOM (checkpoint byte divergence) for task 8.6's soak; the underlying CAUSE is bug-1472.", + "fix": "NOT FIXED, AND DELIBERATELY NOT ATTEMPTED IN THIS SPEC -- confirmed genuinely OUT OF config-upgrade-snapshot's scope (see root_cause above). The real fix belongs in worker.c's worker_from_capnp()/persist.c's WAL_WORKER_CTRL apply case (case WAL_WORKER_CTRL, persist.c:3724), which needs to distinguish JOIN semantics (create-if-missing, EEXIST is a legitimate no-op) from UPDATE/DEAD semantics (an already-existing worker is the EXPECTED case, and the decoded fields -- at minimum host.status -- must still be applied to it, not discarded) -- e.g. an update-in-place path mirroring how restore_host_state (task 3, worker.c, config-upgrade-snapshot's OWN precedent) ORs admin bits into an existing worker rather than treating existing-ness as terminal. That is a genuine, real, previously undiscovered defect (filed as bug-1472) but is squarely core HA worker-control replication, predating this spec by ~2.5 months and untouched by any of its tasks -- fixing it here would be scope creep into a different subsystem's correctness contract, not a config-upgrade-snapshot materialization fix. Task 8.6's soak will keep observing this exact symptom (host-frame byte divergence whenever its scenario admin-closes a host before the final checkpoint) until bug-1472 is fixed by whoever owns worker.c/persist.c's general worker-control replication path. Recommend task 8.6 either (a) accept this as a known, separately-tracked limitation and adjust the soak's own PASS criteria to tolerate it (e.g. skip the admin-close-a-host step, or snapdiff-exclude the host-admin-status byte range) until bug-1472 lands, or (b) block final PASS on bug-1472's fix -- an orchestrator/owner decision, not this investigation's to make.", + "tags": [ + "capnp", + "capnp_encode_host_admin_state", + "collect_host_frames", + "config-upgrade-snapshot", + "distinguished", + "host-frame", + "hypothesis-1-confirmed", + "hypothesis-2-refuted", + "live-soak-finding", + "materialization", + "needs-owner", + "out-of-scope", + "root-caused", + "routed-to-bug-1472", + "single-byte-divergence", + "task-8.6" + ], + "related_bugs": [ + "bug-1469", + "bug-1472" + ], + "occurrences": 3, + "last_seen": "2026-07-25T16:35:00Z" + }, + { + "id": "bug-1472", + "timestamp": "2026-07-25T16:35:00Z", + "error_message": "Host admin-control status changes (hostctrl -c / hostctrl -o, i.e. HOST_CLOSE/HOST_OPEN via worker_ctrl()) never propagate to standby members' in-memory worker state once the target host has already been joined -- discovered while root-causing bug-1471's single-byte checkpoint divergence, but the defect itself is general and has nothing to do with checkpoints, config upgrades, or the config-upgrade-snapshot spec.", + "file": "src/controller/worker.c worker_from_capnp (~827-856); src/controller/persist.c case WAL_WORKER_CTRL apply path (~3724-3786)", + "root_cause": "worker_from_capnp() (worker.c:827-856) is invoked UNCONDITIONALLY by persist.c:3731 for every WAL_WORKER_CTRL entry, regardless of its hook_detail discriminator (JOIN, UPDATE, or DEAD all share this one apply path -- see persist.c:3766-3783's switch, which only controls which post-apply NOTIFICATION hook fires, not whether the mutation itself is applied). worker_from_capnp's own idempotency guard (worker.c:847-853): if key_find() on c->workermgr finds a worker with the decoded name ALREADY PRESENT, it returns -EEXIST immediately, WITHOUT applying any decoded field (including host.status) to the existing worker object. persist.c:3732-3733 treats any -EEXIST return as 'idempotent re-apply (replay / resync) -- no hook' and silently returns 0. This EEXIST short-circuit is correct for its originally-intended purpose (a duplicate/replayed JOIN entry for a worker that's already been created should indeed be a no-op), but WAL_WORKER_CTRL is also the opcode for HOOK_DETAIL_WORKER_UPDATE (worker.c:732-794's worker_ctrl(), which handles HOST_OPEN/ HOST_CLOSE admin commands, sets w->host.status, then fires exactly this same HOOK_AFTER_EVENT/HOOK_DETAIL_WORKER_UPDATE/WAL_WORKER_CTRL path at worker.c:786-787) and HOOK_DETAIL_WORKER_DEAD. For UPDATE/DEAD events, the target worker EXISTING is the NORMAL, EXPECTED case (you can only update or kill an already-joined worker) -- yet the same 'already exists -> skip entirely' logic applies, so the decoded status change is silently discarded on every member OTHER than the one that directly processed the original RPC. Confirmed via git blame: worker_from_capnp was introduced 2026-05-08 (commit 9b6a91a8, 'feat: implement restore_job/worker_from_capnp for WAL recovery'), predating config-upgrade-snapshot's spec work by ~2.5 months; no config-upgrade-snapshot task touches this function or the WAL_WORKER_CTRL apply case. Empirically confirmed via byte-precise capnp decode of two independent live-soak checkpoint sets (/tmp/xce-ha-configupgrade{,-v2}): ctrl-1 (which processed a `hostctrl -c` against a previously-joined synthetic host) has host.status=0x00500000 (XCE_WORKER_CLOSED|XCE_WORKER_CLOSED_BY_ADMIN) in its checkpoint's HostAdminState frame; ctrl-2/ctrl-3 (standbys) both show host.status=0x00000000 for the identically-named host entry -- proving the close never reached their live c->workermgr entries. Because a standby's OWN restart+full-WAL-replay hits the identical code path (persist.c's replay call site also routes through apply_committed_entry's same WAL_WORKER_CTRL case), a member that fully replays from LSN 1 would ALSO reconstruct the JOIN first (creating the worker) and then skip the later UPDATE (already exists) -- so this is not even a restart-repairable staleness; the divergence appears to be permanent for that member until directly patched or until some other mechanism re-applies the admin action. General severity: this affects ANY admin host-control action (`hostctrl -c`/`hostctrl -o`) against an already-joined host, unconditionally, cluster-wide -- not just this soak's synthetic cfgupgrade-host scenario.", + "fix": "FIXED 2026-07-25 (TDD: RED test first, confirmed failing against the pre-fix code, then GREEN). worker_from_capnp() (src/controller/worker.c) now decodes the WAL_WORKER_CTRL entry's hook_detail discriminator (the same 4 leading bytes it previously skipped without inspecting) BEFORE applying its existing-worker idempotency guard. When the target worker already exists: HOOK_DETAIL_WORKER_JOIN keeps the original -EEXIST no-op (a duplicate JOIN replay is genuinely idempotent -- unchanged, regression-guarded). HOOK_DETAIL_WORKER_UPDATE now REPLACES (not ORs -- worker_ctrl()'s HOST_OPEN uses assignment-style &= ~(...) to CLEAR admin bits, so OR would leave a re-opened worker stuck closed) the existing worker's XCE_WORKER_ADMIN_MASK bits with the decoded payload's admin-masked bits, under the worker's own write lock (mirrors restore_host_state's masking discipline, worker.c:487, with replace instead of OR semantics), then returns 0 so persist.c's WAL_WORKER_CTRL apply case (unchanged -- its existing '0 on any successful apply, -EEXIST only for genuine JOIN no-op' contract already handled this generically) falls through to fire the correct HOOK_DETAIL_WORKER_UPDATE notification instead of silently discarding the status change. HOOK_DETAIL_WORKER_DEAD is DELIBERATELY LEFT UNFIXED (still -EEXIST/no-op) -- investigated, not skipped: mark_worker_unavail()'s mutation (worker.c:661-679) is NOT confined to XCE_WORKER_ADMIN_MASK (sets XCE_WORKER_UNAVAIL + dead_since + resets hostattrs_t to 'unknown' + zeroes resource-value slots via set_host_slots), and critically, the live per-host resource-value array xce_worker_t.resvals (a zarray_t, what set_host_slots actually mutates and what scheduling reads) is NOT part of the Worker capnp wire schema at all -- only the separate resvals_to_sched/nresvals_to_sched fields are (confirmed by reading the generated decode_Worker/encode_Worker in controller.capnp.c and the schema in controller.capnp). A naive status-replace for DEAD would be an incomplete fix (would not zero standbys'/replayers' resource slots on a dead-worker event, a real correctness gap for POST-PROMOTION scheduling since the newly-promoted primary would read stale, non-zeroed slots) and needs its own investigation into whether/how to extend the wire schema -- filed separately as bug-1472-remainder below rather than rushed. Fix verified via 2 new + regression tests in test_apply_committed_entry.c (test_ace_worker_ctrl_update_applies_to_existing_worker, test_ace_worker_ctrl_update_replaces_not_ors_admin_bits, test_ace_worker_ctrl_join_duplicate_existing_is_noop -- the last one a regression guard proving JOIN's existing no-op behavior is unchanged) plus the full controller_unit_test suite: baseline (this worktree, immediately pre-fix) 1030 Tests 0 Failures, post-fix 1033 Tests 0 Failures (net +3, exactly the new tests, zero regressions). persist.c was NOT touched -- confirmed its WAL_WORKER_CTRL apply case (persist.c:3724-3786) already treats any non-negative worker_from_capnp() return as a successful apply generically (re-looks-up the worker by name and fires the hook_detail-keyed notification unconditionally), so returning 0 from the new UPDATE branch required no caller-side change.", + "tags": [ + "worker.c", + "persist.c", + "worker_from_capnp", + "WAL_WORKER_CTRL", + "host-control-replication", + "hostctrl", + "admin-status", + "standby-divergence", + "pre-existing", + "out-of-config-upgrade-snapshot-scope", + "needs-owner", + "root-caused", + "not-fixed" + ], + "related_bugs": [ + "bug-1471", + "bug-1472-remainder" + ], + "occurrences": 1, + "last_seen": "2026-07-25T20:15:00Z" + }, + { + "id": "bug-1473", + "timestamp": "2026-07-25T19:12:00Z", + "error_message": "test_second_config_marker_supersedes_first_still_installing_on_member (task 8.8) FAILED on first run: Expected 0 Was 1 -- the fence must clear once materialization for the latest marker (B) completes.", + "file": "src/controller/testsuite/test_config_repl.c (test-only; no production code involved)", + "root_cause": "Test-construction gap, not a production bug. After releasing the checkpoint_in_progress CAS in the raced fixture, the test called the bare persist_checkpoint() to resolve the in-flight-checkpoint scenario, then read upgrade_materialization_fenced() directly -- but plain persist_checkpoint() never calls upgrade_materialization_verify() itself. That call only happens from two production call sites: apply_committed_entry's WAL_CONFIG_MARKER case (fires only on a NEW marker apply, not a bare checkpoint), and the delaymgr-driven retry trampoline (schedule_upgrade_materialization_retry), which explicitly no-ops when delaymgr is not running -- its own doc comment says so verbatim: \"No-op when... the delaymgr is not running (the unit-test fixture path...) -- caller drives directly.\" The bare t42/t43 test fixture (used throughout test_config_repl.c) never inits a delaymgr, so nothing in the raced fixture would ever re-evaluate the fence after the resolving checkpoint landed -- the fence stayed fenced=1 even though materialization for marker B had genuinely completed.", + "fix": "Added an explicit upgrade_materialization_verify(c_raced) call immediately after the resolving persist_checkpoint() call, mirroring the exact pattern already used by the precedent 6.1-c fence tests earlier in this same file (which call upgrade_materialization_verify(c) directly after t43_commit_marker for the same delaymgr-less-fixture reason). Also asserted verify_rc == 0. Confirmed via log trace that upgrade_materialization_verify only logs on a fence 0->1 transition (ha.c:254-256, \"never spams on repeated failed retries\") -- explaining why no second ERROR line appeared for markerB in the raw log even before the fix, which was the first clue this was a missing-caller issue rather than a fence-logic issue.", + "tags": [ + "config-upgrade-snapshot", + "task-8.8", + "test-only", + "upgrade_materialization_verify", + "activation-fence", + "delaymgr", + "test-construction", + "not-a-production-bug" + ], + "related_bugs": [], + "occurrences": 1, + "last_seen": "2026-07-25T19:12:00Z" + }, + { + "id": "bug-1474", + "timestamp": "2026-07-25T20:50:00Z", + "error_message": "config-upgrade-snapshot task 8.9's new live --config-upgrade-wal-trim soak (run-ha-soak.sh, run_config_upgrade_wal_trim_round): the marker-triggered checkpoint's WAL-segment trim (persist_checkpoint_marker_triggered -> trim_wal_segments -> repl_trim_lsn, bug-1147's guard) strands a genuinely mid-catch-up standby's still-needed WAL segment -- but NOT because bug-1147's guard logic itself is wrong. Reproduced identically on 2/2 independent live 3-node runs: a killed, still-down standby's disconnect-guard (last_disconnected_lsn) is silently DESTROYED before the trim ever runs, because an UNRELATED, already-connected peer's redundant reconnect attempt reuses the dead standby's just-freed replicator slot.", + "file": "src/controller/ha.c (primary_heartbeat_fn's 'reconnect to any peer missing from standby_endpoints' loop, ~9219-9253; on_standby_connected, ~8658-8708; raft_cb_become_leader's vote-ep promotion, ~1888-1921); src/controller/repl.c (repl_add_standby's first-empty-slot allocation, ~85-133, and its memset(s,0,...) which wipes last_disconnected_lsn on reuse)", + "root_cause": "Confirmed via direct log evidence on 2 independent live-soak runs (deploy dirs /home/claude/tmp/xce-ha-waltrim and /home/claude/tmp/xce-ha-waltrim2, both --config-upgrade-wal-trim). Sequence, identical both times: (1) An election promotes surviving VOTE endpoints to standby replication channels (raft_cb_become_leader: 'promoted vote ep[i] -> standby channel', repl_add_standby registers them at replicator slots 0/1 -- e.g. run 1: ep[0]=ctrl-1 -> slot 0, ep[1]=ctrl-3 -> slot 1). (2) The test kills a non-primary TARGET standby (ctrl-1) while it is caught up to a known WAL floor. The primary's err_handler (vote_ep_err_handler, correctly wired) detects the RDHUP and calls repl_remove_standby, freeing slot 0 and setting last_disconnected_lsn = ctrl-1's real acked_lsn (confirmed matching the test's own captured floor segment, e.g. seg-5 in run 1, seg-c in run 2) -- bug-1147's guard is set CORRECTLY at this point. (3) Seconds later (matching the ~9s default heartbeat interval), primary_heartbeat_fn's periodic 'reconnect to any peer missing from standby_endpoints' sweep (ha.c ~9219) runs. It correctly identifies ctrl-1 (peer[0]) as missing (reconnect attempt fails with ECONNREFUSED, confirmed in both runs' logs: 'HA: connect to peer[0] (localhost:9991) failed: -111') -- but it ALSO, incorrectly, identifies ctrl-3 (peer[2]) as missing, even though ctrl-3 has been continuously connected the whole time via its slot-1 promoted-vote-channel connection (confirmed acking WAL entries without any gap throughout, via ctrl-2.log's 'commit: ack standby_idx=1' sequence). This triggers a redundant outbound reconnect to ctrl-3 (on_standby_connected fires: 'HA: outbound standby connection to peer[2] established' + 'HA: repl registered late-joiner standby peer[2] (slot 0, localhost:9993)'). (4) repl_add_standby's slot allocation picks the FIRST EMPTY slot by lowest index (repl.c ~85-110) with no regard for whether that slot still holds an unexpired bug-1147 disconnect guard for a DIFFERENT peer -- it picks slot 0 (ctrl-1's just-freed, guard-holding slot, since it is lower-indexed than slot 1) and unconditionally memsets it to zero, WIPING OUT ctrl-1's last_disconnected_lsn guard entirely. (5) When the marker-triggered checkpoint's trim runs shortly after, repl_trim_lsn (repl.c ~650-683) sees slot 0 now occupied by a live, fully-caught-up ctrl-3 duplicate connection (contributing no meaningful floor-lowering) and slot 1 also fully caught up -- with NO surviving trace that ctrl-1 (still down, still needing its old floor) was ever disconnected. floor collapses to the active segment itself, and every segment below it -- including the one ctrl-1 genuinely still needs -- is deleted. This is NOT a bug in bug-1147's guard logic (repl_trim_lsn/trim_wal_segments are working exactly as designed against the replicator state they are handed); it is an upstream defect in how a duplicate/late-joiner reconnect for an ALREADY-connected peer gets allocated a replicator slot. Root cause of WHY the 'peer already has a standby endpoint' check (ha.c ~9225-9249) fails to recognize ctrl-3's existing promoted-vote-channel connection is not fully pinned to a single line -- standby_ep_ctx_t is deliberately layout-compatible with vote_ep_ctx_t (confirmed by direct struct read, ha.c:8590-8603, both start with ha/c/ctx/peer_idx in the same order, so the blind cast the check performs is NOT a type-confusion bug) -- but vote_ep_ctx_t.peer_idx appears to be populated under inconsistent conventions across its several creation call sites in ha.c (e.g. line 542 sets peer_idx=votes_idx [relative, votes-array index] while a comment at line ~6120 asserts 'vctx->peer_idx is the ABSOLUTE cluster index' for a different call site) -- a mismatch between the relative votes_idx_for_i the check computes and whichever convention the SPECIFIC promoted vote_ep_ctx_t for ectx->votes[i].ep was actually built under would make the sctx->peer_idx == votes_idx_for_i comparison fail deterministically for promoted-vote-channel entries, matching the 100% reproduction rate observed. This needs further tracing by whoever owns ha.c's HA connection-management code to identify the exact mismatched call site.", + "fix": "NOT FIXED -- explicitly out of config-upgrade-snapshot task 8.9's boundary (task 8.9 is a regression test for the pre-existing, unmodified bug-1147 guard under the NEW marker-triggered trigger path, not a fix for this separately-discovered HA connection-management defect). Two independent, complementary fix angles for whoever owns ha.c/repl.c's HA connection layer: (a) fix the 'peer already has a standby endpoint' check (ha.c ~9225-9249) so it correctly recognizes an existing promoted-vote-channel connection for a peer, eliminating the spurious duplicate/late-joiner reconnect entirely (the more targeted fix, addresses the root cause) -- likely requires auditing every vote_ep_ctx_t.peer_idx assignment site (ha.c lines 542, 697, 6956, and whichever one specifically constructs ectx->votes[i].ep's ep->data) against the relative-votes_idx convention votes_idx_for_i expects; (b) independently harden repl_add_standby's slot allocation (repl.c) to never silently clobber a slot whose last_disconnected_lsn guard has not yet expired per snap_interval_s -- e.g. skip a guard-holding slot in the first-empty-slot scan (falling through to a genuinely empty slot, or failing loud if none exists) -- this is a defense-in-depth hardening of bug-1147's own retention mechanism against ANY future caller that might reuse a slot prematurely, not just this specific duplicate-connection path. Recommend (b) regardless of whether (a) is fixed, since it directly protects the invariant Requirement 7.4 cares about. The run_config_upgrade_wal_trim_round test infrastructure (run-ha-soak.sh, config-upgrade-snapshot task 8.9) is CORRECT and reproducibly catches this defect via direct on-disk WAL segment inspection -- re-run `run-ha-soak.sh --config-upgrade-wal-trim` after either fix lands to confirm a clean PASS; task 8.9 itself should stay incomplete/blocked on this bug per its own scope boundary (mirrors task 8.6's bug-1471/1472 precedent).\n\n[UPDATE 2026-07-26] FIXED (fix angle (b), the repl.c defense-in-depth hardening): repl_add_standby's slot-allocation scan (repl.c) now does a two-pass search instead of first-empty-slot-by-index. Pass 1 prefers a genuinely virgin slot (ep==NULL && last_disconnected_lsn==0). Pass 2 (fallback, only when no virgin slot exists) reuses the guard-holding slot (ep==NULL && last_disconnected_lsn!=0) with the OLDEST last_disconnect_time -- a deliberate policy: that guard is closest to its own natural repl_expire_disconnect_slots expiry, so reusing it discards the LEAST remaining WAL-retention protection of any guard-holding slot. With MAX_STANDBYS==3, the exhausted case (both non-primary slots simultaneously guard-holding, no virgin slot free) is handled by this same fallback rather than -ENOSPC -- refusing a legitimate new/reconnecting peer would be worse for cluster availability than accepting an early guard loss in an already-degraded state; the pre-existing -ENOSPC path (more distinct live peers than MAX_STANDBYS slots) is untouched, reserved for that genuinely-impossible case only.\nTDD: two new unit tests added to src/controller/testsuite/test_repl_unit.c -- test_repl_add_standby_prefers_virgin_slot_over_guard (RED under the old code: asserted a new unrelated peer must not land in a lower-indexed guard-holding slot when a virgin slot exists, and that the guard's last_disconnected_lsn must survive untouched) and test_repl_add_standby_exhausted_guards_prefers_oldest_disconnect (RED under the old code: asserted the exhausted-fallback deliberately picks the OLDER-disconnected guard slot, not merely the lowest-indexed one -- the test deliberately makes 'oldest-disconnected' and 'lowest-indexed' point at DIFFERENT slots so an accidental first-guard-by-index fallthrough would still fail it). Both new tests failed pre-fix, pass post-fix.\nGREEN: full controller_unit_test suite = 1030 tests (1028 known-good baseline + 2 new), 0 failures, no regressions (ASAN_OPTIONS=detect_leaks=0, nix develop build via `ninja -C src/xce.build controller/controller_unit_test`).\nrepl_remove_standby, repl_expire_disconnect_slots, repl_trim_lsn, and trim_wal_segments were NOT modified -- all confirmed correct and untouched, per this fix's scope.\nThis fix does NOT address fix angle (a) -- the separate ha.c heartbeat-reconnect-sweep defect (vote_ep_ctx_t.peer_idx convention mismatch hypothesis, ha.c ~9219-9254 / ~8687-8708) that triggers the spurious duplicate reconnect in the first place -- that remains a separate, not-fully-root-caused issue, out of this fix's scope. Recommend re-running `run-ha-soak.sh --config-upgrade-wal-trim` (config-upgrade-snapshot task 8.9) to confirm this defense-in-depth closes the observed WAL-segment-loss symptom even without (a) landing.\n\n[UPDATE 2026-07-26, post-review remediation] Independent review REJECTED the initial fix on one finding: the Pass 2 exhausted-fallback branch silently destroyed the reused slot's last_disconnected_lsn/last_disconnect_time via memset with zero logging, undercutting the fix's own stated goal of making the previously-silent WAL-retention-guard destruction visible/bounded -- this file already has an established convention for exactly this class of event (repl_broadcast's WARN(\"repl_broadcast: no standbys registered...\") and WARN(\"repl_broadcast: standby %s:%u evicted...\")). Remediated: repl_add_standby now tracks whether Pass 1 found a virgin slot (used_fallback_slot) and, only on the genuine Pass 2 fallback path, logs WARN(\"repl_add_standby: reusing guard-holding slot %d (host=%s:%u, last_disconnected_lsn=%lu) -- no virgin slot available, WAL-retention protection discarded\", ...) immediately before the memset, capturing the discarded slot's host/port/last_disconnected_lsn while they're still readable. No new test required (a log line has no observable return-value/state effect for a test to assert on) -- verified instead by confirming the WARN string is present in the built binary (`strings controller_unit_test | grep 'reusing guard-holding slot'`) and that both existing bug-1474 tests (test_repl_add_standby_prefers_virgin_slot_over_guard, test_repl_add_standby_exhausted_guards_prefers_oldest_disconnect -- the latter specifically exercises the Pass 2 path this WARN sits on) still pass unchanged. GREEN: full controller_unit_test suite = 1033 tests (1030 baseline + bug-1472's 3 concurrently-landed tests), 0 failures. NOTE: a transient stale-object-file build artifact was observed once in this shared build directory during verification (a link picked up an out-of-date worker.c.o from a moment when a concurrent sibling agent's build was in flight, showing 2 spurious failures unrelated to this change) -- resolved by touching the affected sources to force recompilation; not a defect in this fix, noted here in case it recurs for a future concurrent multi-agent session in this worktree.", + "tags": [ + "ha.c", + "repl.c", + "trim_wal_segments", + "repl_trim_lsn", + "repl_add_standby", + "bug-1147", + "standby_endpoints", + "late-joiner", + "slot-reuse", + "duplicate-connection", + "promoted-vote-channel", + "config-upgrade-snapshot", + "task-8.9", + "live-soak-finding", + "root-caused", + "reproducible-2-of-2", + "needs-owner", + "out-of-scope", + "wal-trim", + "mid-catch-up", + "fixed", + "defense-in-depth", + "log-hygiene", + "review-remediation" + ], + "related_bugs": [ + "bug-1147", + "bug-1471", + "bug-1472" + ], + "occurrences": 2, + "last_seen": "2026-07-26T04:00:00Z" + }, + { + "id": "bug-1472-remainder", + "timestamp": "2026-07-25T20:15:00Z", + "error_message": "Follow-up split out of bug-1472: HOOK_DETAIL_WORKER_DEAD entries applied via WAL_WORKER_CTRL against an already-existing worker still return -EEXIST (no-op) -- a dead-worker transition detected by one member (mark_worker_unavail(), worker.c:661-679) still never replicates its state to other members (standbys, or this member's own WAL replay), unconditionally. NOT a regression: this was already true before bug-1472's investigation; bug-1472's fix deliberately scoped itself to the byte-precise-confirmed HOOK_DETAIL_WORKER_UPDATE case only and left DEAD as -EEXIST/no-op, unchanged.", + "file": "src/controller/worker.c worker_from_capnp (~827-895, post-bug-1472-fix); mark_worker_unavail (~661-679); src/schema/controller.capnp struct Worker (~136-144)", + "root_cause": "mark_worker_unavail()'s mutation is NOT confined to XCE_WORKER_ADMIN_MASK the way worker_ctrl()'s is -- it sets XCE_WORKER_UNAVAIL (a non-admin bit), dead_since, resets hostattrs_t to 'unknown' sentinel strings, AND zeroes the live per-host resource-value slots via set_host_slots()/update_resvals(), which mutates xce_worker_t.resvals (a zarray_t of live xce_val_t entries). Critically, w->host.resvals is NOT part of the Worker capnp wire schema at all (confirmed by reading src/schema/controller.capnp's struct Worker and the generated decode_Worker/encode_Worker in controller.capnp.c) -- only the separate resvals_to_sched/nresvals_to_sched fields (a different, scheduler-push-facing concept) are encoded. So even applying a simple 'replace admin-masked bits' fix analogous to bug-1472's UPDATE fix would NOT fully replicate a DEAD transition's effects: the resource-value slot zeroing would still be silently lost on every other member, which matters materially at PROMOTION time (a newly-promoted primary would read stale, non-zeroed slots for a worker that died before promotion, potentially over-scheduling a dead host). A correct fix needs either (a) a schema change adding a wire-encodable resource-value-slots field so the DEAD payload can carry it, or (b) a different replication strategy for DEAD (e.g. re-deriving 'this worker's connection is gone locally' independently on each member rather than replicating a mutation), which is a design decision beyond a same-task patch.", + "fix": "NOT FIXED -- deliberately deferred, investigated not skipped (see bug-1472's own fix note for the full investigation). Needs its own design decision on how (or whether) to wire-encode the resource-value-slot zeroing, or an alternative non-replicated detection strategy, before a fix can be written safely.", + "tags": [ + "worker.c", + "worker_from_capnp", + "mark_worker_unavail", + "WAL_WORKER_CTRL", + "HOOK_DETAIL_WORKER_DEAD", + "capnp-schema-gap", + "resource-value-replication", + "standby-divergence", + "post-promotion-scheduling-risk", + "needs-owner", + "needs-design-decision", + "not-fixed", + "deferred" + ], + "related_bugs": [ + "bug-1472" + ], + "occurrences": 1, + "last_seen": "2026-07-25T20:15:00Z" + }, + { + "id": "bug-1475", + "timestamp": "2026-07-26T04:36:00Z", + "error_message": "Live config-upgrade-snapshot task 8.6 soak (`run-ha-soak.sh --config-upgrade`), run to verify bug-1472's fix, FAILED \u2014 but NOT at bug-1472's own assertions (materialized-state checkpoint byte-identity and active-configuration identity both PASSED cleanly across all 3 members, confirming bug-1472's fix holds). Failure occurred one step later, inside the Requirement 6.4 host-admin-status-rotation check's own `force_elect_node(\"ctrl-1\")` maneuver: after 3 rounds of overlapping chaotic kills + a live config upgrade all completed and the cluster reconverged 3-of-3, `force_elect_node` killed the spoiler (ctrl-3) and tried to submit a job batch on the surviving {ctrl-2 primary, ctrl-1 standby} pair \u2014 5 consecutive attempts all got 0/3 acked (\"waiting for write-quorum\"), and the round hard-failed: `[xce-test-ha] FAIL: force-elect ctrl-1: submit on {ctrl-2,ctrl-1} failed`. The Req 6.4 workerlist/admin-status assertion itself was never reached.", + "file": "src/controller/ha.c (ha_dispatch_repl_action_for_standby, ha_consume_append_entries, ha_evaluate_repl_action \u2014 HA_REPL_STREAM_WAL decision/dispatch loop); src/controller/config_repl.c (ha_stream_wal_to_standby catch-up streamer)", + "root_cause": "NOT data loss, NOT bug-1472 (worker/host admin-status replication is unaffected \u2014 unrelated subsystem, and its own checks passed). This is a standby catch-up LIVENESS stall: ctrl-1 (which had itself served as primary in term=2 before being killed in round 1 of the chaotic sequence, then restarted) got permanently stuck at applied_lsn=12 and never advanced again for the rest of the run. ctrl-1's own log (`ha_consume_append_entries`) shows a revealing pattern: a zero-entry PROBE AppendEntries at prevIdx=12,n=0 correctly succeeds with match=12 (confirming index 12 IS ctrl-1's true, correct log tip), but the very next entry-carrying AppendEntries from the SAME dispatch cycle uses prevIdx=13 (not 12) for n=1, which ctrl-1 correctly rejects with event=ae_reject_logmismatch (success=0 match=0) since it has no entry at index 13 yet to check a predecessor against. This 1-off prevIdx computation (using prevIdx=standby_applied_lsn+1 instead of prevIdx=standby_applied_lsn for the FIRST entry of a catch-up batch) means every retry of the SAME heartbeat-driven HA_REPL_STREAM_WAL decision (ha_evaluate_repl_action: standby_lsn(12) < committed_lsn(31) -> stream) recomputes and resends the IDENTICAL doomed range, forever, with zero backtrack/self-correction -- confirmed via ctrl-2's log: 'HA repl: standby[0] lsn=12 < committed_lsn=31 -> stream WAL batches' repeats verbatim every ~3s from 04:31:26 through 04:32:26 (60+ seconds, 20+ identical retries, zero progress) after ctrl-2 had already logged 'repl_broadcast: standby localhost:9991 evicted (pending_ack_count=17 > 16) -- triggering catch-up reconnect' and 'HA quorum lost: connected=0 required=1'. Once the soak's own force_elect_node killed the OTHER standby (ctrl-3) as its spoiler maneuver, ctrl-1 became the sole remaining standby, and its permanent inability to catch up meant the primary could never regain 2-of-3 write quorum again -- every subsequent job submission timed out (`commit: async continuation deadline expired`, `jobsubmit_commit_continuation: lsn=N commit failed/timed out (rc=-110)`), exactly matching the soak's observed '0/3 acked; waiting for write-quorum' x5 before hard-failing. Superficially similar symptom signature to already-FIXED bug-1028 (same 'ha_dispatch_repl_action_for_standby: standby[0] lsn=X < committed_lsn=Y -> stream WAL batches' log line looping indefinitely post-failover) but a DIFFERENT specific AE-reject reason -- bug-1028 was a logOk TERM-mapping mismatch (raw hdr.term vs persist_entry_term legacy mapping), fixed 2026-06-23; this is `ae_reject_logmismatch`, which reads like a prevLogIndex/off-by-one issue in how the catch-up streamer picks the FIRST entry's predecessor index, not a term problem -- so this is either a narrower unfixed variant of the same family, or a new regression in a related code path. NOT root-caused down to the exact defective line (this investigation was a live-soak VERIFICATION run for a DIFFERENT bug, not a fix task) -- flagging for whoever picks this up next to read ha_dispatch_repl_action_for_standby/ha_stream_wal_to_standby's prevIdx computation directly and compare against ctrl-1's actual persisted log at lsn=12/13 (waldump). Also notable: this specific soak step (force_elect_node's spoiler-kill-then-submit maneuver, previously only exercised by --sequential mode's post-loop 'leadership coverage' step against an otherwise-calm, fully-settled cluster) had never previously been run immediately after --config-upgrade's THREE rounds of aggressive overlapping chaotic kills plus a live config upgrade -- this specific combination/history may be what's needed to reproduce the stall, rather than it being config-upgrade-specific.", + "fix": "FIXED (2026-07-27/28, via a regression test + real-instrumentation debugging session that continued this entry's original live-soak finding). Landed as THREE coordinated changes, all required together -- the first two alone left the new regression test (test_bug1475_catchup_survives_midstream_checkpoint, test_config_repl.c) RED with applied_lsn stuck at 0 for the whole run:\n\n1. SEND side (config_repl.c, ha_stream_wal_to_standby): when scanning the WAL for entries to stream, a WAL_CHECKPOINT entry is still never built/sent as its own catchup entry, but the prev_log_index/prev_log_term tracker now advances across it like every other scanned entry, instead of freezing one entry behind. A standby that independently applied the same committed WAL_CONFIG_MARKER writes its OWN local checkpoint at the identical LSN (deterministic per-member trigger), so the checkpoint's LSN is a real, held position on both sides, not a gap to skip past chaining-wise.\n\n2. RECEIVE side (ha.c, ha_apply_term_entry_via_library): a JIT resync reads persist_durable_floor(p) and monotonically raises ha->raft.log_len to match before consuming each AppendEntries -- mirroring ha_sync_raft_log_from_recovery's boot-time computation, but applied live on the AE-receive path. This corrects for persist_write_checkpoint_marker (bug-1466, still not fixed at ITS root) advancing persist_t's current_lsn without going through raft_log_append, which otherwise leaves ha->raft.log_len stale and fails logOk's prev_log_index<=log_len bound forever.\n\n3. TERM-INDEX side (persist.c, record_entry_term/entry_term_locked) -- a THIRD, previously-undiscovered gap, found only via live fprintf instrumentation of the new regression test after fixes 1-2 above still left it RED. Fixes 1-2 both depend on persist_entry_term(checkpoint_lsn) reading back 'absent' (0) FOREVER on every member (the explicit, twice-documented design intent in both fixes' own comments and in persist_write_checkpoint_marker's comment). That invariant was actually FALSE: record_entry_term's geometric-growth realloc zero-filled any never-explicitly-recorded gap slot (like a checkpoint's own LSN, which is deliberately never passed to record_entry_term), and entry_term_locked's `lsn <= term_index_count` presence check then read that zero-fill back as WAL_LEGACY_TERM (1), not absent (0), the INSTANT any LATER lsn was recorded and grew term_index_count past the gap -- which happens immediately on a live leader (it appends real entries right after the checkpoint) but not yet on a receiver that has not itself appended past its own checkpoint. So the checkpoint LSN's 'term' was TIME-DEPENDENT: the sender (which streams AFTER its own later entries exist) computed prev_log_term=1 for the entry right after the checkpoint, while the receiver's honest, not-yet-grown term index still (correctly, per design) read 0 for the same LSN -- logOk's equality check spuriously mismatched (0 != 1) and rejected forever, exactly reproducing this entry's original ae_reject_logmismatch signature. Confirmed with real fprintf instrumentation at the streamer, the JIT resync, and raft.c's logOk check (added and removed during this investigation, not left in the tree): prev_log_term flipped from 0 to 1 in the SAME test run, immediately after the leader appended its 2nd post-checkpoint entry. Fixed with a TERM_INDEX_UNSET sentinel (UINT64_MAX) that record_entry_term's growth path now fills gap slots with (instead of 0), and entry_term_locked treats as absent -- so a never-explicitly-written slot reads absent PERMANENTLY, independent of later array growth. Confined to persist.c's two functions plus the term_index doc comment in persist.h; no other call site reads p->term_index[] directly.\n\nAlso completed as part of this fix: (a) audited whether WAL entry types OTHER than WAL_CHECKPOINT bypass record_entry_term the same way -- confirmed NO: WAL_CHECKPOINT (value 100) is the numeric max of wal_entry_type, persist_wal_async and persist_wal_write_replicated both explicitly reject type==WAL_CHECKPOINT up front (it cannot reach record_entry_term via either live path), and replay_wal's `hdr.type < WAL_CHECKPOINT` recording guard already covers every other currently-defined type (WAL_JOB_UPDATE=7, WAL_QUEUE_CTRL=20, WAL_WORKER_CTRL=30, WAL_NOOP=40, WAL_CONFIG_MARKER=50); (b) confirmed no interaction with the RequestVote/PreVote freshness gates (raft.c raft_log_ok, shared by raft_on_vote_request/raft_on_pre_vote_request): that gate also reads on_get_entry_term(s->log_len), which can legitimately land on a checkpoint LSN after the JIT resync in fix 2 -- the TERM_INDEX_UNSET fix makes that read deterministic (always absent) instead of time-dependent, which is a consistency IMPROVEMENT for vote freshness too, not a behavior change in the unsafe direction; full test_ha_prevote.c/test_ha_failover_prevote.c suites pass unchanged. Full regression suite: 1034 Tests, 0 Failures (was 1033/1034 with the new test failing before this fix). Files changed: src/controller/config_repl.c (REAL logic change, landed earlier in this same bug-1475 investigation: ha_stream_wal_to_standby's WAL_CHECKPOINT branch now falls through to the unconditional prev-tracker advance via `hdr.lsn > standby_lsn && hdr.type != WAL_CHECKPOINT`, instead of a hard `continue` that froze the tracker one entry behind -- plus cross-reference comments added in this later session); src/controller/ha.c (REAL logic change, also landed earlier in this investigation: a ~30-line JIT resync block added to the top of ha_apply_term_entry_via_library that raises ha->raft.log_len from persist_durable_floor(p) before consuming each AppendEntries -- plus cross-reference comments added in this later session); src/controller/persist.c (the TERM_INDEX_UNSET sentinel fix + doc comments, the new logic landed in THIS session); src/controller/testsuite/test_config_repl.c (test_bug1475_catchup_survives_midstream_checkpoint + updated doc comments describing all three fix parts). Correction (coordinator review 2026-07-27/28, Finding 1): an earlier version of this fix summary mischaracterized config_repl.c's and ha.c's changes as 'comment-only, no logic change' -- both carry genuine logic changes; they were simply written in an earlier part of this same bug-1475 investigation than the TERM_INDEX_UNSET sentinel (session 3 of the fix), not left unmodified by it.\n\nFinding 2 (coordinator review, 2026-07-27/28, CONFIRMED REAL and FIXED): after the TERM_INDEX_UNSET fix, the reviewer traced a plausible NEW instance of the identical permanent-wedge bug class, reachable via the SNAPSHOT-INSTALL catch-up path (HA_REPL_SEND_SNAPSHOT, dispatched whenever a standby has fallen too far behind for incremental WAL streaming -- a live, common path) instead of WAL-streaming catch-up. ha_snapshot_do_send (ha.c) computes checkpoint_term = persist_entry_term(leader, c->persist.checkpoint_lsn) and ships it on the wire; the receiver's ha_handle_snapshot_chunk calls persist_reconcile_checkpoint_term(p, checkpoint_lsn, checkpoint_term), which called record_entry_term(p, checkpoint_lsn, checkpoint_term) directly -- an EXPLICIT write, not a growth-fill, so it never got the TERM_INDEX_UNSET sentinel even when checkpoint_term==0. entry_term_locked's pre-existing legacy-0 rule then read that raw 0 back as WAL_LEGACY_TERM(1), forever -- permanently diverging from the leader's own permanently-absent(0) value for the SAME lsn whenever c->persist.checkpoint_lsn (== last_applied_lsn at general persist_checkpoint() time, NOT the WAL_CHECKPOINT entry's own physical lsn) happens to coincide with a checkpoint's own un-recorded lsn -- a real, reachable quiescent-state timing (the apply pump has walked, one lsn at a time including a no-op pass over checkpoint slots, all the way to exactly the checkpoint's own position before the next persist_checkpoint()+snapshot-send cycle runs, e.g. right after a config upgrade with no immediate follow-up activity) -- not the common case, but real and worth closing. Proven with a dedicated regression test (test_bug1475_finding2_snapshot_install_checkpoint_term_absent, test_config_repl.c) that drives the REAL ha_send_snapshot_to_standby -> ha_handle_snapshot_chunk -> persist_reconcile_checkpoint_term path (via the xce_snapshot_chunk_hook test seam) with a leader whose checkpoint_lsn is deliberately seeded (via last_applied_lsn) to coincide with its checkpoint's own physical lsn -- confirmed RED by temporarily reverting only persist_reconcile_checkpoint_term's fix (receiver read back term=1, not the expected absent=0) and GREEN after restoring it. Fixed with the SAME TERM_INDEX_UNSET sentinel: persist_reconcile_checkpoint_term now substitutes TERM_INDEX_UNSET for a wire checkpoint_term of exactly 0 before calling record_entry_term, instead of recording the raw 0 -- a wire value of 0 is unambiguous today (ha_snapshot_do_send is the ONLY sender and always computes it via persist_entry_term, whose public contract already returns a DIFFERENT value, WAL_LEGACY_TERM, for a present-but-legacy-0 entry -- so a public 0 can only mean genuinely, permanently absent). A genuinely non-zero checkpoint_term (any real historical term) is still recorded verbatim and still correctly overwrites a stale local term at that LSN, unchanged -- the pre-existing STALE-TERM reconcile test (test_ha_core_safety.c's test_3_1_snapshot_install_does_not_reconcile_boundary_term, CHECKPOINT_TERM=7, a synthetic non-zero value) is unaffected and still passes. Also fixed the stale 'zeroed-on-grow' comment at persist.c's truncate_term_index_locked (grown slots are TERM_INDEX_UNSET-filled since the original TERM_INDEX_UNSET fix, not zero-filled -- comment had not been updated). Re-verified RequestVote/PreVote freshness non-interference for this second fix too: persist_reconcile_checkpoint_term's caller (ha_handle_snapshot_chunk) never touches ha->raft.log_len or any vote-path state; the fix only changes what value entry_term_locked returns for a checkpoint-boundary LSN after a snapshot install (now consistently absent instead of inconsistently WAL_LEGACY_TERM), which is the SAME direction of improvement (deterministic absence vs time/path-dependent) the original TERM_INDEX_UNSET fix already established as safe for the freshness gate. Full suite: 1035 Tests, 0 Failures (was 1034 before this new test).", + "tags": [ + "ha.c", + "config_repl.c", + "ha_dispatch_repl_action_for_standby", + "ha_stream_wal_to_standby", + "ha_consume_append_entries", + "ae_reject_logmismatch", + "catch-up-stall", + "write-quorum-loss", + "standby-liveness", + "config-upgrade-snapshot-task-8.6", + "force_elect_node", + "not-bug-1472", + "bug-1472-fix-verified-good", + "same-family-as-bug-1028", + "needs-owner", + "root-caused-partially", + "not-fixed" + ], + "related_bugs": [ + "bug-1472", + "bug-1028" + ], + "occurrences": 1, + "last_seen": "2026-07-28T03:15:00Z" + }, + { + "id": "bug-1476", + "timestamp": "2026-07-26T04:44:00Z", + "error_message": "Live config-upgrade-snapshot task 8.9 re-verification soak (run-ha-soak.sh --config-upgrade-wal-trim, run to confirm bug-1474's repl.c fix), deploy /home/claude/tmp/xce-ha-waltrim3: ctrl-3 ABORTed via AddressSanitizer heap-use-after-free during the round's live config-upgrade submission, well before TARGET(ctrl-1) was ever restarted. The round's own bug-1474 WAL-trim assertions (floor segment preserved, below-floor segments trimmed, active segment present) all PASSED cleanly before this crash was noticed -- ctrl-3's death was only discovered because it, combined with a second unrelated issue (bug-1475), prevented the round's final '3-of-3 reconvergence' assertion from ever succeeding.", + "file": "src/controller/config_repl.c (load_primary_config ~line 656-666 free_ClusterConfig/free(myconf->cluster_config) call site; config_activate_committed ~line 360; handle_repl_config_push ~line 1280); lib/controller.capnp.c (decode_ClusterConfig_ptr ~line 17074 calloc site, decode_Resource_list ~line 4057 crash site)", + "root_cause": "AddressSanitizer heap-use-after-free, WRITE of size 8, in decode_Resource_list (lib/controller.capnp.c:4057), thread T5. Full ASAN trace (ctrl-3.stderr):\nWRITE by T5: decode_Resource_list <- decode_ClusterConfig <- decode_ClusterConfig_ptr <- load_cluster_config_from_file (config_repl.c:606) <- load_primary_config (config_repl.c:664) <- config_activate_committed (config_repl.c:360) <- handle_repl_config_push (config_repl.c:1280) <- myreq_handler (cluster.c:654) <- vtask_entry (cluster.c:786)\nFREED by T6: load_primary_config (config_repl.c:659, the 'free any prior decoded config before overwriting the pointer' step: free_ClusterConfig(myconf->cluster_config); free(myconf->cluster_config)) <- config_activate_committed (config_repl.c:360) <- handle_repl_config_push (config_repl.c:1280) <- myreq_handler <- vtask_entry\nALLOCATED by T5: calloc in decode_ClusterConfig_ptr (lib/controller.capnp.c:17074) <- load_cluster_config_from_file (config_repl.c:606) <- load_primary_config (config_repl.c:664) <- config_activate_committed <- handle_repl_config_push\nThis is a genuine, unguarded data race: load_primary_config's sequence is (a) if myconf->cluster_config is non-NULL, free it and NULL the pointer, then (b) decode a fresh ClusterConfig into myconf->cluster_config via load_cluster_config_from_file/decode_ClusterConfig_ptr. decode_ClusterConfig_ptr appears to publish the new struct pointer into *config (i.e. myconf->cluster_config) before it has finished populating nested fields (e.g. the Resource_list), since T5 is later observed still writing into the struct via decode_Resource_list AFTER T6 already saw a non-NULL myconf->cluster_config, freed it (T6's own step (a)), and proceeded to decode its own replacement. No mutex protects myconf->cluster_config across this read-free-decode sequence, so two overlapping invocations of handle_repl_config_push -> config_activate_committed -> load_primary_config for the same node race on the shared myconf->cluster_config pointer. This matches the class of concern already flagged (but not as a crash) in bug-976/bug-981 (handle_repl_config_push / config_activate_committed activation-ordering races) -- this is a NEW, more severe manifestation: an actual heap-corruption crash, not just an ordering/verification gap. Plausible trigger in this specific soak: heavy duplicate/late-joiner reconnect churn was independently observed on ctrl-2 (the primary) around the same window (bug-1474's WARN 'reusing guard-holding slot' fired twice, confirming the still-open, out-of-scope ha.c heartbeat-reconnect-sweep defect -- bug-1474's un-addressed 'fix angle (a)' -- was actively spawning duplicate/late-joiner standby connections during this round). If the primary sent the same config-push payload to ctrl-3 twice (once per duplicate connection), ctrl-3 could dispatch two concurrent handle_repl_config_push invocations on separate VTASK_LIVE_BLOCK workers, which is consistent with the observed T5/T6 race. This causal link (duplicate-connection churn -> duplicate config-push delivery -> concurrent load_primary_config race) is a plausible hypothesis from timeline correlation, not confirmed by direct evidence of two inbound config-push messages -- flagged as a hypothesis for whoever investigates, not a proven mechanism.", + "fix": "FIXED (2026-07-28). Two-part fix in load_primary_config() (config_repl.c), independently reviewed and verified via a real pthread-based deterministic race test: (1) added myconf_t.lock (mylock_t, mirrors replicator_t.lock's idiom in repl.c) serializing the entire free-decode-publish sequence against any concurrent load_primary_config() call for the same myconf_t -- initialized in main.c before first use, finalized in myconf_fini(), and in the t43_attach_myconf/t43_free_myconf test fixture. (2) load_cluster_config_from_file() now decodes into a LOCAL temporary (cluster_config_t *tmp), never directly into the shared myconf->cluster_config field -- decode_ClusterConfig_ptr (lib/controller.capnp.c) calloc's and publishes its pointer via the out-parameter BEFORE decode_ClusterConfig populates nested fields (e.g. resources), so decoding into a local closes the early-publish exposure at its source; myconf->cluster_config is only swapped in after the new config is fully decoded and validated, still under myconf->lock. Part (2) is independently necessary because several other readers (cluster.c, queue.c, sched.c, worker.c, apiserver.c, ctrlstatus.c, reply.c) read c->myconf->cluster_config without ever taking myconf->lock, so the field itself must never be observably half-decoded. New regression test test_bug1476_concurrent_load_primary_config_no_uaf_or_double_free (test_config_repl.c) drives two REAL concurrent pthreads through load_primary_config() for the same myconf_t via a deterministic test-only hook (load_primary_config_race_hook, XCE_TESTING-only, NULL/no-op in production) that parks the first thread exactly at the retire-old-config step the live crash raced -- pre-fix this reliably reproduces a genuine ASan-catchable double-free from the same missing-lock root cause; post-fix myconf->lock keeps the second thread blocked for the entire duration, verified both by a captured never-raced-through flag and by the final published config being fully valid, never torn. Full suite: 1035 -> 1036 tests, 0 failures.\n\n[UPDATE 2026-07-28, kiro-impl config-upgrade-snapshot resume] Prior fix landed with a comment block (config_repl.c:639-646) admitting it had been reverted to a RED-phase reproduction (no lock, decode-directly-into-shared-field) for test-construction purposes and NEVER restored to GREEN \u2014 the mylock_init/fini wiring (myconf.h, main.c, myconf.c) landed, but load_primary_config() itself still ran fully unguarded. Full suite run confirmed: test_bug1476_concurrent_load_primary_config_no_uaf_or_double_free FAILED (\"thread B... Expected 0 Was 1\"), i.e. B raced through while A was parked -- the lock was never acquired. Fixed for real: mylock_lock(&myconf->lock) now wraps the ENTIRE load_primary_config() body (acquired first, released at every return including success), and Cap-n-Proto decode now targets a local cluster_config_t *new_config first -- myconf->cluster_config is only freed+swapped after new_config is fully decoded and validated (reserved-name check, generation default), never decoded directly into the shared field. Verified 4/4 clean full-suite runs (1036 Tests 0 Failures 0 Ignored, ASAN_OPTIONS=detect_leaks=0) after the fix, including the specific race test. Committed as part of config-upgrade-snapshot task 8.6/8.9 unblock resume.", + "tags": [ + "config_repl.c", + "load_primary_config", + "config_activate_committed", + "handle_repl_config_push", + "heap-use-after-free", + "decode_Resource_list", + "controller.capnp.c", + "concurrency-race", + "config-upgrade-snapshot", + "task-8.9", + "live-soak-finding", + "bug-1474-verification-run", + "new-crash", + "needs-owner", + "possibly-related-to-bug-1474-fix-angle-a-duplicate-reconnects", + "fixed", + "mylock" + ], + "related_bugs": [ + "bug-976", + "bug-981", + "bug-1474", + "bug-1475" + ], + "occurrences": 2, + "last_seen": "2026-07-28T08:06:00Z" + }, + { + "id": "bug-1477", + "timestamp": "2026-07-28T08:25:00Z", + "error_message": "Live config-upgrade-snapshot task 8.6 soak (run-ha-soak.sh --config-upgrade ~/tmp/xce-ha-configupgrade), run on top of bug-1475's already-fixed and already-built-in commit ce8df990 (confirmed via binary mtime 08:16:27 postdating ce8df990 04:48:53Z and b08e392e 08:13:54Z, plus `strings` matching TERM_INDEX_UNSET/persist_durable_floor), FAILED: \"ctrl-3 has no on-disk checkpoint after the upgrade\". ctrl-1/ctrl-2 both have data/snap/snap-000000000000000b.capnp (51161 bytes, LSN 11 hex = the WAL_CONFIG_MARKER's own lsn); ctrl-3's data/snap/ is completely empty. ctrl-3's log shows a PERMANENT loop (repeats every ~3s/heartbeat for the entire ~3-minute run, never progressing): a bare heartbeat probe at prevIdx=11 succeeds (ae_already_have, match=11), but every walCatchupEntry at prevIdx=12/13/14 is rejected forever with ae_reject_logmismatch. Unlike bug-1475's own signature, this is NOT a transient race that self-heals once durable_lsn catches up -- it never recovers for the rest of the run.", + "file": "src/controller/myapp.c (~line 388-425, the \"leader already known -- skip own election\" fast path and its single guarded cluster_init_phase2 retry, bug-849 lineage); src/controller/ha.c (raft_cb_become_follower ~line 2000-2012, raft_cb_become_leader ~line 1772-1783, ha_elect_evaluate_and_signal ~line 5609-5629/5699-5710 -- all three unconditionally set ha->phase2_done=1 after calling cluster_init_phase2(c) without checking its return value); src/controller/cluster.c (cluster_init_phase2 ~line 1342-1598, the sole call site of commit_engine_init/persist_recover/ha_sync_raft_log_from_recovery); src/controller/persist.c (~line 796-799, on_durable_advance documented as registered ONLY by commit_engine_init)", + "root_cause": "ROOT-CAUSED with byte/log-precise evidence, NOT config-upgrade-snapshot's own defect. ctrl-3 (my_priority=2, the highest-priority-number/most-deferred candidate in the 3-node cluster, per myapp_run's startup-stagger nanosleep) never ran its own raft candidacy for the ENTIRE test: zero occurrences of raft_cb_become_follower/raft_cb_become_leader/\"-> CTRL_STANDBY\" anywhere in ctrl-3.log. Instead, by the time its stagger delay elapsed, ctrl-1 (priority 0) had already voted/established itself, so myapp_run's own \"leader already known\" check (myapp.c ~343-390: voted_for_name set, or raft.term>0, or primary_ctrl_fd>=0) was true, and ctrl-3 took the `goto skip_election` fast path, entirely bypassing ha_start_election_async and therefore every raft-library election callback for the rest of its process lifetime (it only ever GRANTS votes to others afterward -- confirmed via repeated vote_granted/pre_vote_granted RAFT[p2] events with no corresponding become_follower/become_leader). The skip_election fast path (myapp.c ~415-425, bug-849, commit 20e59d0b, 2026-06-21 -- three-plus weeks before config-upgrade-snapshot's first commit 9e68335a) makes exactly ONE, correctly-guarded attempt at cluster_init_phase2(&c) (checks prc, only sets c.ha.phase2_done=1 on success) -- and at 08:18:26,930, that ONE attempt fired before c->myconf->cluster_config was populated (ctrl-3 had no local config file and had not yet received/activated a push), so cluster_init_phase2 returned -EINVAL immediately (cluster.c:1349-1358, before doing ANY of its real work) and the WARN 'cluster_init_phase2 on standby rejoin failed (rc=-22) -- WAL not recovered; falling back to election-path recovery' fired. phase2_done correctly stayed 0 -- but there is NO OTHER retry mechanism anywhere in the codebase for a node that (a) took the skip_election fast path and (b) never subsequently runs its own contested election: the only other three call sites that could retry (raft_cb_become_follower ha.c:2000-2012, raft_cb_become_leader ha.c:1772-1783, ha_elect_evaluate_and_signal's CTRL_PRIMARY/CTRL_STANDBY branches ha.c:5609-5629/5699-5710) never fire for ctrl-3 because it never engages the raft callback machinery at all. (Separately confirmed those three call sites ALSO unconditionally set ha->phase2_done=1 after calling cluster_init_phase2(c) with NO check of its return value -- unlike myapp.c's own careful guard -- a second, adjacent defect of the same class that did not trigger THIS failure only because ctrl-3 never reached them, but would identically strand any node whose FIRST raft-driven role transition happens to race ahead of config load.) Consequence, confirmed via grep: ctrl-3.log has ZERO occurrences of \"commit engine wired\", \"persist_recover\", \"xce_config_init\", or \"create_lost_and_found\" for the entire run (vs. multiple occurrences on ctrl-1/ctrl-2, once per boot/restart/re-election) -- cluster_init_phase2 (and therefore commit_engine_init, cluster.c:1484-1496) NEVER completed on ctrl-3. persist.c:796-799 documents on_durable_advance (the sole wake hook driving persist_apply_pump_run) as registered ONLY inside commit_engine_init -- so without it, persist_apply_pump_run/apply_committed_entry NEVER runs on ctrl-3, for ANY committed LSN, for the whole process lifetime. This means persist_checkpoint_marker_triggered (config-upgrade-snapshot task 5's own WAL_CONFIG_MARKER-triggered checkpoint, apply_committed_entry's WAL_CONFIG_MARKER case) never fires on ctrl-3 -- explaining precisely why its data/snap/ is empty while ctrl-1/ctrl-2 (whose commit engines DID wire) both hold the identical snap-000000000000000b.capnp. ctrl-3's config nonetheless activates cosmetically at 08:18:48,572 via a SEPARATE, independent code path (handle_repl_config_push -> load_primary_config -> config_activate_committed, an RPC push handler that does not touch the commit engine or apply pump at all) -- masking the underlying defect and making the soak's materialized-state/checkpoint assertions the first thing ever to surface it. bug-1475's three-part fix (config_repl.c's tracker-advance-across-WAL_CHECKPOINT, ha.c's JIT persist_durable_floor resync of ha->raft.log_len, persist.c's TERM_INDEX_UNSET sentinel) is necessary and correctly targets its own class of bug (a receiving standby's log_len bookkeeping merely LAGGING behind a checkpoint it DID independently write) but structurally cannot cover this failure: bug-1475's own fix explicitly documents and depends on the invariant 'a standby that independently applied the SAME committed WAL_CONFIG_MARKER writes its OWN local checkpoint at the identical LSN (deterministic per-member trigger)' -- ctrl-3 violates that precondition outright (it never writes the checkpoint AT ALL, not merely late), so the primary's catch-up stream's prev_log_index=12 (the checkpoint's own lsn, per bug-1475's now-correct sender tracking) checks against an entry ctrl-3 genuinely, permanently does not have. ae_reject_logmismatch is therefore a CORRECT rejection of ctrl-3's true log state, not a stale/racy one -- and since a WAL_CHECKPOINT entry is local-only/non-replicated BY DESIGN (persist_write_checkpoint_marker's own doc comment; persist_wal_write_replicated/persist_wal_async both explicitly reject type==WAL_CHECKPOINT), ctrl-3 can NEVER receive lsn=12 over the wire, and can never independently write it either (cluster_init_phase2/commit_engine_init never retries) -- a genuinely permanent, not merely time-bounded, wedge, exactly matching the soak's observed behavior (unlike bug-1475's transient race, this repeated with zero progress for the entire ~3-minute run). git blame confirms both implicated pre-existing defects (myapp.c's skip_election fast path, commit 20e59d0b bug-849 2026-06-21; ha.c's raft-callback phase2_done latch structure, commit 8f0d2d55 task 6.2 raft-library) predate config-upgrade-snapshot's first commit (9e68335a) by roughly a month -- this is a pre-existing HA bootstrap/election gap, NOT something config-upgrade-snapshot's task 5 introduced. Task 5 merely exposed it by creating a new cross-member structural dependency (every member independently checkpointing at a synchronized marker-boundary LSN) that a node whose commit engine/apply pump never wired silently violates. Before config-upgrade-snapshot, the same underlying gap would have left such a node's materialized state (jobmgr/qmgr/workermgr) permanently stale/un-applied with a much less visible failure signature (no crash, no wedge -- just silently wrong query results if that node were ever promoted), plausibly unnoticed by prior soaks that do not assert per-member materialized-state identity.", + "fix": "FIXED (2026-07-28). Root cause: myapp_run's skip_election passive path, and 3 raft-callback call sites (raft_cb_become_leader, raft_cb_become_follower, ha_elect_evaluate_and_signal x2), all latched ha->phase2_done=1 UNCONDITIONALLY right after calling cluster_init_phase2 (or its ha_phase2_hook test seam), discarding its return value entirely -- so a single failed attempt (e.g. racing config availability, cluster_init_phase2 returning -EINVAL because cluster_config wasn't loaded yet) permanently stranded the member: commit_engine_init never ran, so apply_committed_entry never applied ANY committed WAL entry for the rest of that process's life, and -- for a node on the passive skip_election path specifically -- NOTHING else would ever retry it (the other 3 call sites only fire via this node's own raft-library state transitions, which never happen for a passive standby whose primary keeps heartbeating normally).\n\nFix: extracted a shared, idempotent retry mechanism -- ha_phase2_retry_fn (the blocking retry itself, capturing cluster_init_phase2/ha_phase2_hook's real return value, latching phase2_done ONLY on rc==0) plus ha_schedule_phase2_retry (a delaymgr-scheduled, SELF-RESCHEDULING trigger at heartbeat_interval_ms cadence -- unlike upgrade_materialization_retry/config_activate_retry, which are re-triggered externally by recurring commit-advance events, nothing recurring would otherwise ever re-trigger this for a passive skip_election node, so this one self-arms). Wired into all 5 call sites: myapp.c's skip_election block now schedules a retry instead of just WARNing on failure; raft_cb_become_follower and ha_elect_evaluate_and_signal's STANDBY branch likewise (safe to stay passive while retrying); raft_cb_become_leader and ha_elect_evaluate_and_signal's PRIMARY branch additionally REFUSE promotion on failure in raft_cb_become_leader specifically (mirroring the sibling upgrade_materialization_fenced refusal in the same function -- a promoted primary with an unwired commit engine would be far worse than a delayed promotion); the legacy ha_elect_evaluate_and_signal PRIMARY branch does NOT refuse (its ctx->done semaphore is already posted to the caller before this point in that function, so refusing would leave an inconsistent signal -- it proceeds to CTRL_PRIMARY and lets the self-rescheduling retry wire the commit engine shortly after instead).\n\nTDD: 4 new tests in test_config_repl.c (test_ha_phase2_retry_fn_noop_when_already_done, test_ha_phase2_retry_fn_does_not_latch_on_failure_and_succeeds_on_retry -- the core regression, RED confirmed by temporarily reverting the rc-gating back to an unconditional latch and observing the exact predicted failure -- test_schedule_phase2_retry_noop_when_already_done, test_schedule_phase2_retry_noop_when_delaymgr_not_running). GREEN: full controller_unit_test suite = 1044 tests, 0 failures, clean across multiple runs (including the RED/GREEN round-trip).\n\nLive-verified: re-ran run-ha-soak.sh --config-upgrade (the exact scenario that originally found this bug) -- ctrl-2's log shows the retry mechanism firing for real (4 failed cluster_init_phase2 attempts at ~3s intervals, rc=-22, then success: \"commit engine now wired (bug-1477)\"), and the soak's own checkpoint-identity, config-identity, and host-admin-status-survival assertions (the exact things bug-1477 blocked) all PASS. The soak run subsequently hit a DIFFERENT, seemingly unrelated failure later in its own force-elect-rotation step (repeated commit timeouts, rc=-110, on ctrl-1-as-primary) -- flagged separately, NOT part of this fix's scope; this soak scenario has never previously reached that step (earlier runs always failed earlier, at bug-1471/1472's checkpoint divergence or this bug's own catch-up wedge), so it may be a pre-existing, newly-exposed issue rather than a regression from this fix -- needs its own dedicated investigation.", + "tags": [ + "apply_pump_never_wired", + "not-bug-1475", + "commit_engine_init", + "cluster.c", + "config-upgrade-snapshot-task-8.6", + "not-fixed", + "marker-triggered-checkpoint", + "out-of-scope-upstream", + "skip_election", + "retry-mechanism", + "phase2_done", + "ae_reject_logmismatch", + "bug-849-lineage", + "permanent-catchup-wedge", + "fixed", + "myapp.c", + "bug-1475-fix-verified-good", + "ha.c", + "needs-owner", + "cluster_init_phase2" + ], + "related_bugs": [ + "bug-1475", + "bug-1466", + "bug-849" + ], + "occurrences": 2, + "last_seen": "2026-07-28T13:25:00Z" + }, + { + "id": "bug-1478", + "timestamp": "2026-07-28T09:00:00Z", + "error_message": "config-upgrade-snapshot task 8.9 live soak (run-ha-soak.sh --config-upgrade-wal-trim ~/tmp/xce-ha-waltrim): bug-1474's floor-preservation fix confirmed working (floor segment seg-5 correctly preserved, all below-floor segments correctly trimmed) but the round still FAILED: \"cluster did not reconverge to 3-of-3 after restarting ctrl-1 -- the preserved floor segment did not actually suffice for real incremental catch-up\". ctrl-1 (TARGET, killed+restarted 3x) settles into a PERMANENT, zero-progress loop: its own raft AppendEntries exchanges cleanly reach match=22 with zero ae_reject events (heartbeat probe at prevIdx=22,n=0 -> success=1 match=22, repeating every ~3s forever), while ctrl-2 (primary) simultaneously and forever logs 'HA repl: standby[0] lsn=21 < committed_lsn=22 -> stream WAL batches' / 'ha_stream_wal_to_standby: streamed WAL [21+1..22] to standby' every heartbeat cycle with zero effect -- an off-by-one disagreement (21 vs 22) between the two sides that never reconciles.", + "file": "src/controller/ha.c (repl_ack_decode_and_dispatch's heartbeat/stateReport reply branch, ~6379-6388 pre-fix -- the `target_lsn = max(committed_lsn, last_written)` computation feeding ha_dispatch_repl_action_for_standby)", + "root_cause": "ROOT-CAUSED with byte/log-precise evidence; NOT a recurrence of bug-1474 (independently re-confirmed working in this same run -- floor preservation and below-floor trim both correct), bug-1475 (independently re-confirmed working -- ctrl-1's own raft log_len/term-index bookkeeping across the checkpoint boundary is clean, zero ae_reject_logmismatch anywhere in its log, unlike bug-1475's own signature), or bug-1477 (ctrl-1 clearly DID wire its commit engine every boot -- multiple 'commit engine wired'/persist_recover lines confirmed, unlike bug-1477's ctrl-3 which never ran its own election at all). This is a THIRD, previously-undiscovered gap in the same 'WAL_CHECKPOINT breaks LSN co-tracking invariants' family already flagged (not fixed at its root) as bug-1466.\n\nGround truth via `xce_test waldump` on the preserved deploy dir (~/tmp/xce-ha-waltrim): ctrl-2's WAL shows lsn=21 as the WAL_CONFIG_MARKER (type UNKNOWN/40 bytes, matching ctrl-2's own log 'Config change committed (marker_lsn=21)') and lsn=22 as a WAL_CHECKPOINT (0-byte payload) -- confirming persist_write_checkpoint_marker (persist.c:1747, `hdr.lsn = p->current_lsn++`) fired immediately after the marker committed and consumed the very next LSN slot, exactly as apply_committed_entry's WAL_CONFIG_MARKER case (persist_checkpoint_marker_triggered) is designed to do (config-upgrade-snapshot task 5). Critically, ctrl-2's OWN commit_advance_locked (commit.c, the SOLE authoritative committed_lsn writer) never logs an advance past 21 anywhere in the run ('commit: committed_lsn 20 -> 21' is the LAST such line) -- the real, majority-gated persist.committed_lsn correctly and permanently stays at 21, since no standby can ever legitimately ack a local-only, non-replicated checkpoint entry.\n\nYet ha_dispatch_repl_action_for_standby's own log line reports 'committed_lsn=22' from the very next heartbeat cycle onward. Traced to repl_ack_decode_and_dispatch's stateReportMsg branch (ha.c): `last_written = c->persist.current_lsn - 1` (the RAW physical WAL tip, which unconditionally counts EVERY locally-appended entry including a local-only WAL_CHECKPOINT) is combined via `target_lsn = max(committed_lsn, last_written)` and THIS value -- not the real committed_lsn -- is what gets passed into ha_dispatch_repl_action_for_standby's committed_lsn parameter and printed in its log line. Once ctrl-2 wrote its checkpoint, last_written jumped to 22 and target_lsn followed, permanently outrunning the real committed_lsn by exactly one. Since a checkpoint's own consumed LSN slot is, by design, NEVER streamed (ha_stream_wal_to_standby) or applied (persist_wal_write_replicated / persist_wal_async both explicitly reject type==WAL_CHECKPOINT) by any standby, no standby's applied_lsn can EVER legitimately reach 22 -- ha_evaluate_repl_action's `standby_lsn < committed_lsn` check can never become false, so HA_REPL_CONVERGED is permanently unreachable for any standby once a local checkpoint has interleaved ahead of the next real committed advance. ha_stream_wal_to_standby is correctly re-invoked every heartbeat (per its own logic) but finds nothing new in [22,22] to send every single time -- a deterministic, permanent, zero-progress busy-loop, exactly matching this run's observed symptom (and ctrl-1's own applied_lsn -- correctly capped at 21 by ha_advance_applied_lsn/ha_apply_term_entry_via_library's own last-contiguously-held-LSN semantic, mirrored by ha_handle_snapshot_chunk's snapshot-install path setting applied_lsn=checkpoint_lsn never checkpoint_lsn+1 -- can never satisfy it).\n\nThe `target_lsn = max(committed_lsn, last_written)` fallback's OWN doc comment states its intended purpose narrowly: 'so standbys can catch up even when committed_lsn is stuck at 0 (no replicator-registered standbys to advance it)' -- a cluster-bootstrap convenience. But the code applies the max() UNCONDITIONALLY, not only when committed_lsn==0 -- broader than its own documented justification. This mismatch was latent and harmless until config-upgrade-snapshot task 5 introduced a LIVE, mid-operation local-only WAL entry (the marker-triggered checkpoint) that advances current_lsn without a corresponding real committed advance; bug-1466 already flagged the SAME persist_write_checkpoint_marker current_lsn bump as breaking raft's own log_len co-tracking invariant (affecting vote-freshness comparisons) -- this is a THIRD, distinct consequence of that same architectural gap, this time poisoning the replication-target computation instead. git blame confirms the `target_lsn` code (commit 06135954f, 2026-06-11) predates config-upgrade-snapshot's first commit by roughly two weeks -- a pre-existing HA replication-decision defect that config-upgrade-snapshot's task 5 merely exposed (same routing pattern as bug-1471/1472/1474/1477 before it), not something task 8.9 introduced.", + "fix": "FIXED (2026-07-28, narrowly-scoped TDD fix, in-scope to land here per explicit high-confidence + narrow-scope authorization -- unlike bug-1474's angle (a) and bug-1477, which were left for the HA-core spec owner): extracted the target_lsn computation out of repl_ack_decode_and_dispatch into a new small, pure, side-effect-free, directly-unit-testable function `ha_compute_repl_target_lsn(committed_lsn, last_written)` (declared in ha.h, defined in ha.c right after ha_process_standby_state). The fix restores the fallback to EXACTLY its own documented intent: `last_written` is used ONLY when `committed_lsn == 0` (genuine bootstrap, nothing ever committed) -- any other case returns `committed_lsn` unchanged, never leaking a trailing local-only checkpoint's consumed LSN into the convergence decision. repl_ack_decode_and_dispatch's call site now reads `target_lsn = ha_compute_repl_target_lsn(committed_lsn, last_written)`, replacing the old unconditional max(). No other function touched -- ha_evaluate_repl_action, ha_process_standby_state, ha_dispatch_repl_action_for_standby, ha_stream_wal_to_standby, persist_write_checkpoint_marker, and commit.c's majority_candidate_locked/commit_advance_locked are all confirmed correct and untouched (the bug was purely in what value got PASSED to them, not in their own logic).\n\nTDD: four new unit tests added to src/controller/testsuite/test_ha_role.c (all four call the new pure function directly, no capnp/network scaffolding needed): test_compute_repl_target_lsn_bootstrap_fallback (committed_lsn=0, last_written=42 -> 42, confirms the intended bootstrap behavior is preserved), test_compute_repl_target_lsn_zero_zero (0,0 -> 0, fresh-cluster edge case), test_compute_repl_target_lsn_ignores_trailing_checkpoint_lsn (this bug's EXACT reproduction shape: committed_lsn=21, last_written=22 -> must return 21, not 22 -- confirmed RED under the old unconditional-max code via a temporary revert, 'Expected 21 Was 22', then GREEN after restoring the fix), test_compute_repl_target_lsn_committed_already_ahead (100,50 -> 100, normal steady-state sanity check). GREEN: full controller_unit_test suite = 1040 Tests, 0 Failures, 0 Ignored, run twice clean (ASAN_OPTIONS=detect_leaks=0, nix devshell, `ninja -C src/xce.build controller/controller_unit_test`). RED confirmed independently: reverting only the new function's body to the old unconditional-max logic (leaving the new tests in place) reproduced exactly 1 failure at the predicted assertion ('Expected 21 Was 22'), then re-applying the fix restored 0 failures -- proving the test genuinely exercises this bug and the fix genuinely closes it, not a tautological test.\n\nNOT yet re-verified via a fresh live `run-ha-soak.sh --config-upgrade-wal-trim` run (recommended next step, mirroring bug-1474's own verification precedent, before considering config-upgrade-snapshot task 8.9 unblocked) -- this fix was validated at the unit level only within this investigation's scope.\n\n[UPDATE 2026-07-28, kiro-impl config-upgrade-snapshot task 8.9 verification] The initial fix landed only ONE of TWO call sites duplicating this formula: ha.c repl_ack_decode_and_dispatch (fixed, via the new ha_compute_repl_target_lsn) and config_repl.c catchup_derive_target (a SEPARATE, independently-duplicated inline copy of the exact same max(committed_lsn,last_written) formula, used by ha_walack_on_ack/catchup_lane_fn -- the ACK-driven catch-up continuation path, not the heartbeat/stateReport path the first fix covered). Rerunning the live --config-upgrade-wal-trim soak after the first fix STILL FAILED (\"cluster did not reconverge to 3-of-3... preserved floor segment did not actually suffice for real incremental catch-up\") -- confirmed via log correlation that ctrl-2 (primary) was stuck forever at ha_dispatch_repl_action_for_standby committed_lsn=22 while catchup_lane_fn's own INFO line independently reported target=22 (the OLD, unfixed formula) even though the heartbeat path's committed_lsn logging correctly showed 21. Root-caused to catchup_derive_target (config_repl.c:2617-2627, its own comment literally said \"re-derive the replication target exactly as ha.c:2771-2776 / D6\" -- a deliberate, now-stale duplication). Fixed by making catchup_derive_target call the SAME ha_compute_repl_target_lsn pure function instead of re-deriving the formula inline, so the two paths can never disagree again. Applying just this second-call-site fix then caused a NEW symptom: controller_unit_test hung indefinitely (0.8%% CPU, blocked not spinning) inside test_convergence_verification.c's test_walack_behind_target_schedules_one_continuation. Isolated via a controlled revert-and-rerun (confirmed clean 1040/1040 with the OLD formula restored, confirming the SECOND fix -- not something else -- was the trigger). Root cause of the hang: three pre-existing tests in that file (\"behind\", \"single\", \"respawn\") hardcoded committed_lsn=4 with appended_lsn=9, deliberately exercising the OLD buggy max(4,9)=9 behavior as their expected target -- with the fix, the correct target becomes 4, so acked_lsn=5/6 (used by the later tests) no longer legitimately reads as \"still behind\", and the FIRST test's own hardcoded assertion fails. Because this test file's harness (cv_setup/cv_teardown) does not run teardown from a signal-safe/finally-equivalent path, a failed TEST_ASSERT's Unity longjmp skips cv_teardown() entirely, leaking that test's live 8-thread commit_engine still bound to the soon-to-be-memset g_cv global -- the NEXT test's cv_setup() memset-ing g_cv out from under those still-running threads is what actually produced the observed permanent hang, not a defect in the production fix itself. Fixed by updating all three tests' committed_lsn from 4 to 9 (matching appended_lsn, so target=9 under EITHER formula) -- this decouples them from the bug-1478 edge case entirely (which already has dedicated, correct pure-function coverage in test_ha_role.c), preserving each test's TRUE original intent (continuation scheduling / single-flight / respawn-after-complete mechanics) with a minimal, surgical change. Stale docstrings referencing the old \"max(committed_lsn, last_written)\" formula were also corrected to reference ha_compute_repl_target_lsn. GREEN: full controller_unit_test suite = 1040 Tests, 0 Failures, run clean 2x after all fixes (plus the isolation-revert run confirming the pre-fix baseline was also clean). Live-verified: run-ha-soak.sh --config-upgrade-wal-trim now reports a clean PASS (18 jobs, zero job loss, ctrl-1 reconverged 3-of-3 using the preserved floor segment for real incremental catch-up) -- config-upgrade-snapshot task 8.9 unblocked.", + "tags": [ + "ha.c", + "repl_ack_decode_and_dispatch", + "ha_dispatch_repl_action_for_standby", + "ha_evaluate_repl_action", + "target_lsn", + "last_written", + "committed_lsn", + "WAL_CHECKPOINT", + "persist_write_checkpoint_marker", + "bug-1466", + "bug-1474-fix-verified-good", + "bug-1475-fix-verified-good", + "not-bug-1477", + "config-upgrade-snapshot-task-8.9", + "permanent-catchup-wedge", + "off-by-one", + "waldump-confirmed", + "root-caused", + "fixed", + "narrowly-scoped-fix", + "tdd", + "red-green-verified" + ], + "related_bugs": [ + "bug-1466", + "bug-1474", + "bug-1475", + "bug-1477" + ], + "occurrences": 2, + "last_seen": "2026-07-28T09:52:00Z" + }, + { + "id": "bug-1479", + "timestamp": "2026-07-28T13:25:00Z", + "error_message": "Live config-upgrade-snapshot task 8.6 soak (run-ha-soak.sh --config-upgrade ~/tmp/xce-ha-configupgrade2), run on top of bug-1477's fix (checkpoint-identity, config-identity, and host-admin-status-survival assertions ALL PASSED for the first time), FAILED later in the force-elect-rotation step: 5 consecutive job-submit attempts on {ctrl-1 (primary), ctrl-2 (standby)} all got 0/3 acked (\"waiting for write-quorum\"), then hard-failed. Investigated the ORIGINAL hypothesis (a leaked VTASK_LIVE_BLOCK/commit-admission slot from an earlier burst of 17 commit timeouts, lsn=15..31, rc=-110) and REFUTED it: commit_resolve()/wait_release_locked() correctly release the admission slot on every timeout (confirmed 17 'async continuation deadline expired' + 17 'commit failed/timed out' WARN pairs, 1:1, in ctrl-1.log) \u2014 no admission-pool leak exists. The REAL mechanism is unrelated to admission control entirely: a permanent Raft AppendEntries log-conflict wedge on standby ctrl-2, compounded by a NACK-handling gap that never triggers catch-up.", + "file": "src/controller/ha.c (repl_ack_decode_and_dispatch's WAL-ACK branch, ~6456-6644 -- the `!success` NACK path at ~6631-6642 only checks for a higher term and WARNs \"ignoring\", never calls repl_on_ack/repl_start_catchup/any retry); src/controller/repl.c (repl_broadcast ~295-380, the live single-entry send path -- fire-and-forget, no nextIndex backoff-and-retry on rejection; repl_on_ack ~250-271, the ONLY site that decrements pending_ack_count, never invoked on a NACK)", + "root_cause": "ROOT-CAUSED with byte-precise waldump evidence (xce_test's built-in `waldump` REPL command against the preserved deploy dir ~/tmp/xce-ha-configupgrade2), cross-correlated with both ctrl-1's and ctrl-2's logs line-by-line. During the soak's chaotic round-3 kill/restart churn, THREE leadership changes happened in rapid succession (term 3 -> 4 -> 5) within about 20 seconds (13:18:57-13:19:19): ctrl-2 briefly won term=3 and appended its own arm-own-term-gate NOOP, was killed before that entry could be widely replicated/committed, a short-lived term=4 leader (never directly observed in either surviving node's own become-leader lines, but proven to have existed by its WAL fingerprint) won next and wrote ITS OWN own-term NOOP at the SAME log index (14), and finally ctrl-1 won term=5 and became the lasting primary. `xce_test waldump` on ctrl-1's canonical (surviving, majority) WAL shows: lsn=12 CHECKPOINT term=2 (the marker-triggered checkpoint from config-upgrade-snapshot task 5, matching bug-1475/1477/1478's exact family), lsn=13 NOOP term=4 (the short-lived term-4 leader's noop), lsn=14 NOOP term=5 (ctrl-1's own winning noop). `xce_test waldump` on ctrl-2's own local pre-restart WAL shows: lsn=12 CHECKPOINT term=2 (agrees with ctrl-1), lsn=13 NOOP **term=3** (ctrl-2's OWN aborted, never-widely-replicated noop from its deposed term-3 stint) -- a genuine, CONFLICTING entry at the SAME index (13) with a DIFFERENT term (3 vs the canonical 4). This is an entirely NORMAL, expected Raft outcome of rapid leader churn (Raft's own \u00a75.3 log-matching property explicitly anticipates followers accumulating stale, uncommitted tail entries from deposed leaders) -- ctrl-2 correctly rejects ctrl-1's AppendEntries at prevLogIndex=13 with logOk's standard conflicting-term check (confirmed via ha_consume_append_entries's own trace: `prevIdx=13 n=1 -> success=0 match=0`, `RAFT[p1] term=5 event=ae_reject_logmismatch`, repeating for EVERY subsequent new entry ctrl-1 tries to send: prevIdx=14,15,16,...29, one per newly-committed lsn, all rejected, spanning 13:19:19 through 13:19:52). The BUG is what happens (or rather, does not happen) next, confirmed via two independent, compounding gaps: (1) ctrl-1 NEVER backs off and retries with a DECREMENTED prevLogIndex to find the point of log agreement (the standard Raft nextIndex-conflict-resolution protocol, which would let ctrl-2 truncate its conflicting lsn=13 tail and adopt the canonical term=4 entry) -- repl_broadcast (repl.c:295-380) is a pure fire-and-forget per-new-entry send with zero synchronous handling of the reply; it always advances prevIdx forward to (next-new-lsn - 1), never backward. (2) repl_ack_decode_and_dispatch's WAL-ACK reply-dispatch branch in ha.c (~6631-6642) handles a NACK (success=0) by checking ONLY for a higher observed term (raft_on_higher_term_observed, correctly added for the DIFFERENT bug-1421 stale-term scenario) and then explicitly `WARN(\"...success=0 \u2014 ignoring\")` -- the comment says exactly what the code does: the rejection is discarded. Critically, `repl_on_ack` (repl.c:250-271) is the ONLY code path that decrements `standby_conn_t.pending_ack_count`, and it is called ONLY from the `success` branch -- so a standby that is stuck rejecting (for ANY reason) has pending_ack_count monotonically climb by 1 on every subsequent broadcast attempt with ZERO corresponding decrements, until repl_broadcast's own MAX_PENDING_ACKS=16 defensive eviction (repl.c:325-334, from ha-config-bootstrap task 7.2, commit 3969064e, 2026-05-28 -- a full month before config-upgrade-snapshot's first commit) fires and marks the standby in_catch_up=1 at 13:19:53 (confirmed: 'repl_broadcast: standby localhost:9992 evicted (pending_ack_count=17 > 16) \u2014 triggering catch-up reconnect'). This eviction correctly EXCLUDES the standby from repl_active_standby_count (hence from ha_has_write_quorum's majority calculation) -- but nothing in the codebase actually DRIVES a catch-up stream or snapshot-install for it afterward: ctrl-2's log shows ZERO entry-carrying AppendEntries for the remaining ~60 seconds of the run (13:19:53 through the log's end at 13:20:53) -- only bare heartbeat probes (prevIdx=13,n=0) that trivially succeed since a presence-only probe at the standby's own true log_len=13 doesn't hit the term-conflict check. With ctrl-2 permanently excluded (in_catch_up=1, never un-evicted) and ctrl-3 permanently failing to reconnect (separate, unrelated ECONNREFUSED loop, likely a real chaos-kill in this soak round), ctrl-1 has connected=0 standbys forever ('HA quorum lost: connected=0 required=1', logged once at the eviction and never restored) -- every subsequent job submission either times out waiting for write-quorum (0/3 acked, matching the force-elect step's failure verbatim) or gets an immediate -XCE_ERR_NOT_READY (-10013) fast-reject via ha_dispatch_gate's quorum check. This is a GENUINE, SERIOUS, and apparently PERMANENT availability defect: ANY standby whose log happens to diverge by even ONE entry at a single index during leader-election churn (an entirely normal, expected Raft occurrence, not itself a bug) can become irrecoverably stuck and permanently excluded from quorum, with no self-healing path -- in a 3-node cluster this is one bad-luck election sequence away from TOTAL, PERMANENT write-quorum loss if it hits 2 of 3 standbys. Same family as bug-1466 (open, 'WAL_CHECKPOINT breaks LSN/term co-tracking', NOT fixed at its root) and its now-3 fixed siblings (bug-1475, bug-1477, bug-1478) -- this is the family's 5th distinct member, but the trigger here (an ordinary post-election term-conflicted log tail, NOT specifically a checkpoint-boundary term-derivation issue) is narrower than bug-1466's checkpoint-specific framing and points instead at a genuinely MISSING piece of core Raft log-repair protocol (conflict-driven nextIndex backoff + NACK-triggered catch-up), which appears to have never been implemented for this replication path at all -- not a regression, a gap. git blame confirms both implicated mechanisms (repl_broadcast's pending_ack_count eviction, commit 3969064e, 2026-05-28; the NACK-handling 'ignoring' branch in repl_ack_decode_and_dispatch, present since at least bug-1421's fix, itself predating config-upgrade-snapshot) are pre-existing, core HA replication code untouched by any config-upgrade-snapshot task -- config-upgrade-snapshot's task 5 (marker-triggered per-member local checkpoint) merely adds one more entry into the WAL stream around the point where this pre-existing gap gets exercised; it does not create the gap itself.", + "fix": "NOT FIXED -- explicitly out of scope for a single safe pass, per this investigation's own conclusion (matches kiro-debug's guidance against forcing a fix when the true defect requires a protocol design decision, not a narrow patch). At least TWO separate, non-trivial design questions need to be resolved by whoever owns ha.c/repl.c's replication-catch-up protocol before a fix can be written safely: (a) should an ae_reject_logmismatch NACK immediately trigger repl_start_catchup (moving the standby to catch-up mode on the FIRST conflict, rather than silently accumulating up to 16 failed sends first)? This is the more targeted, root-cause-adjacent fix. (b) independently, once a standby IS marked in_catch_up (whether via this path or the existing MAX_PENDING_ACKS eviction), what mechanism is SUPPOSED to actually drive its catch-up (stream from join_applied_lsn, or snapshot-install if too far behind) and clear in_catch_up via repl_complete_catchup? Evidence here shows NOTHING does, for at least this eviction path -- config_repl.c's ACK-driven catchup_lane_fn/ha_walack_on_ack continuation (the only other repl_complete_catchup call site found) is itself ACK-driven, so it can never engage for a standby that never sends a genuine ACK in the first place; whether IT (or a periodic sweep independent of ACKs) is supposed to notice an in_catch_up standby and proactively start streaming it needs its own trace by the owning team. A correct fix likely needs both: NACK-triggered catch-up entry (closing gap (a)) AND a proactive (not purely ACK-reactive) catch-up driver that streams from join_applied_lsn or falls back to snapshot-install for any in_catch_up standby (closing gap (b)) -- implementing only one without the other would leave the defect only partially closed. Recommend routing to whoever owns ha.c/repl.c's HA replication/catch-up protocol (the same 'needs-owner' bucket as bug-1474's still-open fix angle (a) and bug-1472-remainder) for a proper design pass, THEN a TDD fix + live re-verification via `run-ha-soak.sh --config-upgrade` on a fresh deploy dir. Preserved evidence: ~/tmp/xce-ha-configupgrade2 (do not delete) -- `xce_test waldump ` (via the xce_test REPL: `printf 'waldump \\nquit\\n' | ASAN_OPTIONS=detect_leaks=0 timeout 60 /controller/xce_test`) reproduces the byte-precise lsn=13 term-3-vs-term-4 conflict evidence directly from the preserved WAL segments at any time.\n\nUPDATE (2026-07-29, this session): a fix WAS committed (uncommitted in the 'config' worktree at investigation time) implementing exactly gap (a) from this entry's own recommendation -- ha_raft_on_repl_nack() (ha.c/ha.h) routes a WAL-ACK-reply NACK into the raft library's nextIndex backoff and returns a corrected resume LSN; repl_ack_decode_and_dispatch's NACK branch calls it and immediately repl_start_catchup() with the corrected LSN; repl_get_catchup_join_lsn() (repl.c/repl.h) lets the heartbeat-driven ha_dispatch_repl_action_for_standby use the corrected position; repl_complete_catchup() now also resets pending_ack_count. 1048/1048 controller_unit_test PASS. HOWEVER: a fresh live-soak re-verification (run-ha-soak.sh --config-upgrade, deploy preserved at ~/tmp/xce_ha_bug1479_verify, NOT deleted) reproduced the ORIGINAL symptom verbatim -- force-elect ctrl-2 round: 5/5 submit_jobs attempts on {ctrl-1,ctrl-2} got 0/3 acked, hard FAIL. Root-caused: the fix's NACK-routing branch in repl_ack_decode_and_dispatch (ha.c ~6680-6720) is CORRECT but UNREACHABLE in production, because the standby's OWN reject path never sends a NACK (or any reply) in the first place. ha_apply_wal_catchup_entry has three reject paths (ha.c ~3230-3232 via ha_apply_term_entry_via_library for the term-carrying single/batch case -- the one actually hit live; ~3320-3321 for a batch sub-entry apply failure; ~3373-3374 for the legacy single-entry path) that all explicitly do 'no ACK' on a logOk reject/forward-gap. ha_send_wal_ack_reply (ha.c:3084-3106) is the ONLY function anywhere in the controller that ever constructs a WalAckReply, and it hardcodes success=1 unconditionally -- there is NO production code path that ever sends success=0. Live evidence: ctrl-2's own log shows repeating RAFT[p1] event=ae_reject_logmismatch / ha_consume_append_entries success=0 match=0 at growing prevIdx (40,41,...54) while stuck at match=20 forever; ctrl-1's log has ZERO 'WAL NACK from standby' or ha_raft_on_repl_nack lines the entire time -- the primary never learns of the rejection at all, so it never backs off nextIndex or re-arms catch-up, and committed_lsn stays frozen (the only alive standby can never re-sync, and the heartbeat-driven catch-up's own target is gated on the same frozen committed_lsn). STILL NOT FULLY FIXED. New follow-up spec .kiro/specs/raft-adapter-conformance/ created to (1) fix this concrete missing-NACK-reply defect at the three reject sites and (2) perform a broader raft.tla action-by-action conformance pass over the controller's Raft adapter (ha.c/repl.c/config_repl.c) -- distinct from raft-sim-conformance, which is scoped to src/lib/raft/raft_sim.c (library-only, in-process) and explicitly does not cover this adapter code.\n\nUPDATE 2 (2026-07-29, this session): fully FIXED and verified live end-to-end. Two more compounding gaps found and closed after the NACK-send fix (UPDATE 1) landed:\n(1) ha_apply_term_entry_via_library's logOk-reject path (ha.c, the single live-reachable reject site) sent NO reply at all on rejection -- ha_send_wal_ack_reply hardcoded success=1 unconditionally, so the primary-side ha_raft_on_repl_nack (correct since UPDATE 1) was unreachable dead code. Fixed by adding ha_send_wal_ack_reply_ex(ha, ep, c, lsn, success) and calling it with success=0 on reject, plus a new ha_wal_ack_send_hook (ha.h, XCE_TESTING) so a unit test can observe the NACK without a live endpoint (test_bug1479_ae_reject_sends_nack_not_silence, test_config_repl.c). Confirmed live in a 2nd soak run: ctrl-1's log showed real 'WAL NACK from standby ... success=0 -- marking catch-up' lines for the first time.\n(2) Even with (1) working, that 2nd soak run STILL failed at the identical force-elect ctrl-2 point: ha_stream_wal_to_standby's catch-up range was hard-bounded at committed_lsn, and committed_lsn can never advance in this exact scenario because advancing it requires an ACK from the very standby that's stuck catching up (2-of-3 alive, this standby is the only path to a new majority) -- a self-referential deadlock. Fixed by adding a new pure function ha_compute_repl_stream_ceiling_lsn(committed_lsn, last_written, checkpoint_lsn) (ha.c/ha.h), wired into ha_dispatch_repl_action_for_standby to widen the STREAM_WAL ceiling (and the ha_evaluate_repl_action convergence check that gates it) to the leader's own log tail instead of just committed_lsn -- matching raft.tla's real AppendEntries semantics (leaderCommit is advisory to the follower, never a cap on what gets sent) -- while still guarding against bug-1478's old trap (never widening to a trailing local-only checkpoint's own unstreamable LSN slot). 4 new pure-function tests in test_ha_role.c (test_compute_repl_stream_ceiling_lsn_*), RED-confirmed against a stubbed committed_lsn-only version before the real fix was restored.\nFull verification: 1053/1053 controller_unit_test PASS twice clean. THREE successive live run-ha-soak.sh --config-upgrade re-runs tracked each fix: v1 (NACK-send only) still FAILED at force-elect ctrl-2 (0/3 acked); v2 confirmed NACKs now reaching the primary but still FAILED (frozen committed_lsn=14, ha_stream_wal_to_standby target never advanced); v3 (both fixes together) PASSED end-to-end: all 3 force-elect rounds succeeded (ctrl-2: 3/3 jobs acked, term=6; ctrl-3: 3/3 jobs acked, term=7), final verdict 'PASS (config-upgrade): 12 jobs, zero materialized-state divergence, zero configuration divergence, host admin-status confirmed across all members'. Evidence preserved at ~/tmp/xce_ha_bug1479_verify, ~/tmp/xce_ha_bug1479_verify_v2, ~/tmp/xce_ha_bug1479_verify_v3 (all not deleted). config-upgrade-snapshot task 8.6 unblocked. The raft-adapter-conformance spec created mid-investigation had its concrete seed defect (missing NACK reply) fixed here; the broader raft.tla action-by-action conformance audit it also scopes remains valid, separate future work.", + "tags": [ + "ha.c", + "repl.c", + "repl_broadcast", + "repl_ack_decode_and_dispatch", + "repl_on_ack", + "pending_ack_count", + "MAX_PENDING_ACKS", + "in_catch_up", + "ae_reject_logmismatch", + "raft-log-conflict", + "nextIndex-backoff-missing", + "nack-ignored", + "catch-up-never-triggered", + "permanent-quorum-loss", + "config-upgrade-snapshot-task-8.6", + "force_elect_node", + "not-admission-slot-leak", + "hypothesis-refuted", + "same-family-as-bug-1466", + "waldump-confirmed", + "byte-precise", + "root-caused", + "needs-owner", + "needs-design-decision", + "live-soak-finding", + "missing-nack-reply", + "raft-adapter-conformance", + "fixed", + "verified-live", + "raft-tla-conformance", + "stream-ceiling", + "nack-now-sent" + ], + "related_bugs": [ + "bug-1466", + "bug-1471", + "bug-1472", + "bug-1474", + "bug-1475", + "bug-1477", + "bug-1478", + "bug-1421" + ], + "occurrences": 3, + "last_seen": "2026-07-29T04:05:00Z" + }, + { + "id": "bug-1480", + "timestamp": "2026-07-29T07:05:00Z", + "error_message": "raft-adapter-conformance systematic audit finding (not yet fixed): handle_repl_config_push (config_repl.c:1261-1337) has 4 reject paths (malformed body, missing bytes/sha256, sha256 mismatch, conf_save_config failure) that all return without ever sending a ReplConfigPushReply. Only the success path (1326-1335) sends {accepted=1}; there is no {accepted=0} anywhere in this function, despite its own doc-comment implying a reject reply exists. cluster.c dispatch case (652-655) has no fallback error-reply either.", + "file": "src/controller/config_repl.c (handle_repl_config_push, ~1261-1337)", + "root_cause": "Same defect class as bug-1479 (silent-drop-on-reject) but on the out-of-band config-push channel instead of the WAL catch-up channel: the reject branches never construct/send a reply message at all, so push_config_to_standbys / repl_wait_majority_ack cannot distinguish an active standby rejection from a lost packet -- both degrade identically to CONF_PUSH_TIMEOUT_MS.", + "fix": "Not yet fixed. Scoped into raft-adapter-conformance Requirement 2 (AppendEntries-equivalent rejection reply integrity, AC2/AC3) and Requirement 7 AC4 (config-push reply should also carry a term for term-discovery parity with heartbeat/WAL-NACK replies). Fix: send an explicit {accepted=0} ReplConfigPushReply (plus current term) on each of the 4 reject paths, mirroring ha_send_wal_ack_reply_ex.", + "tags": [ + "config_repl.c", + "handle_repl_config_push", + "ReplConfigPushReply", + "silent-drop-on-reject", + "same-family-as-bug-1479", + "raft-adapter-conformance", + "found-not-yet-fixed", + "config-push-channel", + "term-discovery-gap" + ], + "related_bugs": [ + "bug-1479" + ], + "occurrences": 1, + "last_seen": "2026-07-29T07:05:00Z" + }, + { + "id": "bug-1481", + "timestamp": "2026-07-29T07:05:00Z", + "error_message": "raft-adapter-conformance systematic audit finding (not yet fixed): vote_ep_err_handler (ha.c:7564-7608), the shared on_err handler wired onto both real-vote and PreVote endpoints (ha.c:688-689, 827-828), handles post-connect endpoint failures (RDHUP/SSL error/remote close arriving after connect+monitor succeeded but before a reply) by calling the legacy handle_request_vote_reply directly instead of routing through vote_reply_dispatch / pre_vote_reply_dispatch (the production tally path fixed by bug-1423/1424 for connect-time and monitor-time failures only).", + "file": "src/controller/ha.c (vote_ep_err_handler, ~7564-7608; correct sibling sites at ~693-726 and ~830-855)", + "root_cause": "Reopens the bug-1423/1424 defect class (vote-request send failure must reach the reply tally) for one failure window the original fix did not cover: connect/iomgr_monitor failures were fixed, but a failure arriving after a successful connect+monitor (before any reply) still bypasses the tally via the legacy path. Effect is bounded (election_timeout_ms / PreVote round timeout still fire), not a permanent deadlock, but the fast all-replied quorum-decision path is structurally unreachable for this failure mode.", + "fix": "Not yet fixed. Scoped into raft-adapter-conformance Requirement 4 (RequestVote/PreVote reply integrity across all failure modes, AC2). Fix: route vote_ep_err_handler election-phase failures through vote_reply_dispatch/pre_vote_reply_dispatch instead of handle_request_vote_reply, matching the bug-1423/1424 pattern.", + "tags": [ + "ha.c", + "vote_ep_err_handler", + "handle_request_vote_reply", + "vote_reply_dispatch", + "pre_vote_reply_dispatch", + "silent-drop-on-reject", + "same-family-as-bug-1423", + "raft-adapter-conformance", + "found-not-yet-fixed", + "election-timeout-bounded", + "not-a-deadlock" + ], + "related_bugs": [ + "bug-1423" + ], + "occurrences": 1, + "last_seen": "2026-07-29T07:05:00Z" + }, + { + "id": "bug-1482", + "timestamp": "2026-07-29T10:43:00Z", + "error_message": "AddressSanitizer: heap-use-after-free in free_packet ../lib/netio.c:437, called from test_config_push_reply_higher_term_adopts_and_steps_down (test_config_repl.c:3718)", + "file": "src/controller/testsuite/test_config_repl.c; doc comment in src/controller/cluster.c (myreq_handler_for_test)", + "root_cause": "A code-review finding (task 2.2 re-review) reported that cpr22_build_config_push_reply_pkt's io_packet_t* pkt was never freed after myreq_handler_for_test(...), citing myreq_handler_for_test's own doc comment ('the caller still owns/frees pkt itself') as the ownership contract. That doc comment was WRONG: myreq_handler unconditionally calls xce_decode(pkt, &request) as its first step, and xce_decode() itself (src/lib/request.c:274-275) unconditionally calls free_packet(pkt) (frees pkt->data) then FREEUP(pkt) (frees the io_packet_t struct) before returning -- ownership of pkt is transferred into xce_decode, not retained by the caller. Applying the review finding literally (adding free_packet(pkt); free(pkt); after the call) was therefore a double-free/use-after-free, caught immediately by ASAN even under ASAN_OPTIONS=detect_leaks=0 (UAF detection is independent of leak detection).", + "fix": "Removed the erroneous free_packet(pkt)+free(pkt) call from the test (there is no leak -- pkt is already fully consumed). Corrected myreq_handler_for_test's doc comment in cluster.c to accurately state that pkt ownership is transferred into the call via xce_decode, and callers must not touch/free pkt afterward. Added an explanatory NOTE comment at the call site in the test to prevent recurrence.", + "tags": [ + "cluster.c", + "myreq_handler_for_test", + "xce_decode", + "free_packet", + "use-after-free", + "double-free", + "misleading-doc-comment", + "ownership-contract", + "raft-adapter-conformance", + "task-2.2", + "review-finding-corrected" + ], + "related_bugs": [], + "occurrences": 1, + "last_seen": "2026-07-29T10:43:00Z" + }, + { + "id": "bug-1483", + "timestamp": "2026-07-29T10:20:00Z", + "error_message": "ha_arm_heartbeat_timeout_vtask (ha.c ~8805-8848), when called with c==NULL (unit-test mode driving a PreVote round to LOST without stubbing ha_prevote_rearm_liveness_hook), callocs a liveness_poll_ctx_t and stores it into the static s_liveness_ctx, but the guard skips scheduling anything to poll or free it -- the context leaks/dangles permanently in that code path.", + "file": "src/controller/ha.c (ha_arm_heartbeat_timeout_vtask, ~8805-8848)", + "root_cause": "Test-mode (c==NULL) entry into a production helper allocates state but has no corresponding free/cleanup path when the delaymgr-scheduling guard short-circuits -- a latent leak specific to the c==NULL unit-test invocation shape, not exercised by any live production path (a real cluster_t is never NULL there).", + "fix": "Not yet fixed. Found during raft-adapter-conformance task 3.2 while building a PreVote-round LOST-path test; avoided (not papered over) by stubbing ha_prevote_rearm_liveness_hook and resetting it to NULL after, matching the existing workaround already used by every LOST-path test in test_ha_prevote.c. A real fix would either free s_liveness_ctx on the c==NULL early-return, or make the guard also handle cleanup in that branch.", + "tags": [ + "ha.c", + "ha_arm_heartbeat_timeout_vtask", + "s_liveness_ctx", + "test-mode-leak", + "c-is-null-path", + "raft-adapter-conformance", + "task-3.2", + "found-not-yet-fixed", + "pre-existing", + "prevote-lost-path" + ], + "related_bugs": [], + "occurrences": 1, + "last_seen": "2026-07-29T10:20:00Z" + }, + { + "id": "bug-1484", + "timestamp": "2026-07-29T21:10:00Z", + "error_message": "No test anywhere in src/controller/testsuite/ drives the real production dispatch path for either term-discovery vector bug-1421 introduced (heartbeat-reply state-report term adoption, ha.c:6690-6711; WAL-NACK reply_term adoption inside repl_ack_decode_and_dispatch, ha.c:6805-6814) and asserts raft_on_higher_term_observed actually fires. The look-alike test_intake_higher_term_heartbeat_adopts_term (test_term_safety_adapter.c:1232) drives a different code path (ha_consume_append_entries -> raft_on_append_entries_request library-level UpdateTerm, an AE-request vector, not the AE-reply/state-report fallback bug-1421 added). test_persist_recovery.c (cited by design.md line 146 as covering this) has zero term-adoption content -- pure recovery mechanics. test_config_repl.c only covers the NEW config-push term vector added by this feature (Req 7.4), not the pre-existing heartbeat/WAL-NACK vectors.", + "file": "src/controller/ha.c (~6690-6711 heartbeat-reply vector, ~6805-6814 WAL-NACK vector); no test file drives either", + "root_cause": "bug-1421 (heartbeat-reply term-discovery fallback) shipped without a dedicated regression test asserting raft_on_higher_term_observed fires through the real repl_ack_decode_and_dispatch path for either vector -- found during raft-adapter-conformance task 7.2s regression-confirmation sweep, which searched the whole test suite (not just its own 8-file boundary) for `raft_on_higher_term_observed`/`higher_term` callers and found none exercising these two vectors end-to-end.", + "fix": "Not yet fixed. Requirement 7.5 (raft-adapter-conformance) claims these vectors \"already verified for this cluster\" -- that claim currently rests on unverified ground. A fix would add a repl_ack_decode_and_dispatch-level test asserting term adoption fires on (a) a higher-term heartbeat-reply state report and (b) a higher-term WAL-NACK reply, mirroring the pattern task 2.2s test_config_push_reply_higher_term_adopts_and_steps_down already established for the third (config-push) vector.", + "tags": [ + "ha.c", + "raft_on_higher_term_observed", + "repl_ack_decode_and_dispatch", + "term-discovery", + "bug-1421", + "coverage-gap", + "raft-adapter-conformance", + "task-7.2", + "found-not-yet-fixed", + "pre-existing", + "requirement-7.1", + "requirement-7.2", + "requirement-7.5" + ], + "related_bugs": [ + "bug-1421" + ], + "occurrences": 1, + "last_seen": "2026-07-29T21:10:00Z" + }, + { + "id": "bug-1485", + "timestamp": "2026-07-30T14:35:00Z", + "error_message": "test_e2e_live_ha_push.py::test_live_config_push_against_primary_reaches_success_path flaky (near-100% fail rate across ~25 live runs during admin-config-tool task 6.3 round-2 remediation): TimeoutError: controller never opened localhost:: [Errno 111] Connection refused, raised from a fresh wait_for_port re-probe of the elected primary's own address performed AFTER _wait_for_primary (CTRL_PRIMARY marker) + a new _wait_for_standbys (both other nodes show CTRL_STANDBY) + a 3s settle sleep all already succeeded.", + "file": "src/xceadmin/tests/test_e2e_live_ha_push.py (live_ha_cluster fixture); root cause is in src/controller (exact site not yet isolated -- C-side investigation out of this task's boundary)", + "root_cause": "NOT a pure test-side readiness race as round-1 review assumed. Live forensic capture (ps aux mid-run) caught the freshly-elected ctrl-1 as a zombie process moments after its own log recorded the full raft_cb_become_leader promotion sequence ending at 'HA: repl registered standby ep[1] (slot 1, ...)' -- the log then goes silent (no crash trace, no further lines) and the process is gone. stderr was DEVNULL'd in the fixture so no ASAN/signal diagnostic was captured from a real failing pytest run. Confusingly, 3 separate standalone (non-pytest) repro scripts using byte-identical spawn code (same xce_controller build.dbg binary, same deploy-ha.sh cluster, same peers/certs/workdir args) ran the exact same primary-promotion sequence successfully every single time with the primary staying alive and the port reachable for 20-30s post-election -- while pytest-invoked runs of the identical fixture code failed roughly 24/25 times. Ruled out during investigation: pytest's default fd-capture (reproduced with -s / capturing disabled, still failed 3/3), ulimits (NPROC/NOFILE/AS/STACK identical between nix-develop plain-shell and pytest-invoked-via-python contexts), and orphaned-process port contention (ps aux clean before each batch). True root cause not isolated -- prime suspects are a genuine timing-sensitive controller-side crash/race in the CTRL_STANDBY->CTRL_PRIMARY raft promotion path (raft_cb_become_leader / repl registration) that pytest's process tree somehow makes far more likely to trigger, or a process-group/session/signal-mask difference inherited by subprocess.Popen children when the parent is pytest vs a bare python3 script.", + "fix": "NOT FIXED. Task 6.3 round-2 remediation implemented exactly what the round-1 reviewer asked for (_wait_for_standbys mirroring test-heartbeat-tolerance.sh's two-phase primary+standby gate, a heartbeat_interval_ms-justified 3s settle delay, and a fresh wait_for_port re-probe of the primary before yielding the fixture) but this did not close the flake because the underlying failure is the primary process disappearing, not merely its port being slow to open -- no test-side wait can outlast a process that is gone. Reported BLOCKED back to the task's parent controller rather than continuing to chase a C-level root cause outside this task's explicit boundary (controller-side C changes forbidden). Next step for whoever picks this up: capture stderr (not DEVNULL) from a real pytest-triggered failure to get an ASAN report or signal number, and/or strace the primary process across a live failing pytest run to see whether/why its listening socket closes.", + "tags": [ + "flaky-test", + "ha", + "raft-election", + "controller-crash", + "admin-config-tool", + "task-6.3", + "e2e-live", + "unresolved", + "pytest-specific" + ], + "related_bugs": [ + "bug-1477", + "bug-1479", + "bug-606" + ], + "occurrences": 24, + "last_seen": "2026-07-30T14:35:00Z" + }, + { + "id": "bug-1486", + "timestamp": "2026-07-31T03:48:00Z", + "error_message": "Backgrounded `xce-build.sh all` run went silently stale mid-flight ([360/362], no ninja FAILED/error line, no completion marker, log just stopped growing at 03:38:35) with no matching build process left in `ps aux`", + "file": "src/tools/xce-build.sh", + "root_cause": "Multiple DIFFERENT Claude agent sessions independently invoked xce-build.sh against the same shared worktree's src/xce.build directory at the same time (confirmed via `ps auxf`: sibling `bash src/tools/xce-build.sh controller` and a separate `... all` invocation running under different parent `claude --output-format stream-json` PIDs). xce-build.sh has no lock/mutex around its unconditional `rm -rf \"$BUILD_DIR\"` + `meson setup` step (same code path as bug-1464), so a peer session's rm -rf tore the build directory out from under this session's own in-progress ninja/meson compile with no error propagation -- the backgrounded process's output just stops, indistinguishable at first glance from a hang.", + "fix": "No code change; workflow fix. Before trusting a backgrounded xce-build.sh log that has gone stale, run `ps auxf | grep -E 'xce-build|meson|ninja|cc1'` to check for a sibling xce-build.sh invocation from a different session targeting the same worktree. If found, do not start a third concurrent build -- bounded-poll (`while kill -0 $PEER_PID; do sleep 5; done`, not a passive wait for a background-task notification) until all peer invocations exit, then run exactly one clean blocking `xce-build.sh all` and treat only that run's own output as ground truth. Real fix would be a flock/lockfile around setup_build()'s rm-rf+meson-setup step in xce-build.sh itself so concurrent sessions serialize instead of clobbering.", + "tags": [ + "build", + "xce-build.sh", + "meson", + "ninja", + "race-condition", + "concurrent-sessions", + "multi-agent", + "workflow" + ], + "related_bugs": [ + "bug-1464" + ], + "occurrences": 1, + "last_seen": "2026-07-31T03:48:00Z" + }, + { + "id": "bug-1487", + "timestamp": "2026-07-31T04:50:00Z", + "error_message": "30-round chaotic HA soak (run-ha-soak.sh --chaotic 30): committed_job_loss=1 at round 25/30 (VERDICT result=FAIL). expect-job reported job 0-6-1785473261-216067 not found on newly-elected primary ctrl-2 (term=27) immediately after the round-25 kill of ctrl-1 (term=26). committed_divergence stayed 0 for the entire run; the job (and all others) was confirmed present on every subsequent verify (rounds 26-30) and the final post-run sweep of all 93 tracked jobs.", + "file": ".claude/skills/xce-test-ha/run-ha-soak.sh", + "root_cause": "NOT a controller bug and NOT genuinely-uncommitted-at-kill-time -- test-harness false-positive, root-caused with log/timestamp evidence from the preserved run (/home/claude/tmp/xce-ha-chaos30-run1/logs/ctrl-{1,2,3}.log). ctrl-1 (primary, term=26) majority-committed all 3 round-25 jobs (lsn 101,102,103; self + ctrl-2 ack) between 04:47:41.839 and 04:47:42.052 -- confirmed via commit_advance_locked log lines -- moments before being killed at 04:47:42+. ctrl-2 was elected primary at term=27 at 04:47:52.470 with ha_compute_safe_committed_lsn reporting safe_committed_lsn=99 \"(from 2 granted voters)\" -- the conservative Raft floor, since ctrl-3 (the only other reachable voter) was itself mid-restart/catch-up from round 25s own overlapping-kill design and had not yet caught up past lsn 99. Per the documented Raft Figure-8 safety mechanism (ha_arm_own_term_gate, ha.c:4997-5046: \"the universal commit barrier still requires per-entry majority of a new-term entry\"), a newly-elected primary cannot fold a PRIOR-term entry into its own committed_lsn watermark merely because it holds it durably -- it must first get a fresh majority ack, under its OWN term, for its own-term WAL_NOOP (armed at promotion). ctrl-2s committed_lsn stayed at 100 (excluding lsn 101-103) until ctrl-3s WAL catch-up stream let it ack the term-27 noop at lsn=104, at 04:47:58.702 -- 6.232s after promotion (commit_advance_locked: \"committed_lsn 100 -> 104\"). expect-job (joblist query) reads c->jobmgr, which the apply pump only populates for entries that have reached this committed_lsn watermark -- so the job was genuinely invisible, by design, for that 6.232s window. run-ha-soak.shs verify_classify() (chaotic mode) runs its expect-job check immediately once wait_for_new_primary detects the new primary is SERVING at a higher term -- unlike verify_no_loss (sequential mode; already carries a 3-attempt/2s-settle retry from bug-1422 for a related but distinct client-retry-storm race) and unlike wait_for_full_convergence (which chaotic mode intentionally skips between kills, by design, to land kills inside overlap windows) -- so its single, instantaneous query landed inside the 6.232s barrier window and counted a false LOSS. Comparison: round 24s election (ctrl-1, term=26) closed the identical barrier window in only 167ms because the other voting peer was not mid-catch-up at that moment -- the window duration is directly proportional to how far behind the second required peer is, which chaotic modes overlapping-restart design can occasionally push to several seconds.", + "fix": "Added a bounded retry (5 attempts, 2s settle between) around the expect-job/verdict-classify check in verify_classify() (.claude/skills/xce-test-ha/run-ha-soak.sh) -- mirrors verify_no_loss/bug-1422s \"retry the whole check\" precedent, only retrying on a LOSS classification (BUG854/OK still resolve on the first attempt, matching prior semantics). ~8s of total settle margin comfortably covers the measured 6.232s worst-case gap while staying bounded -- a job still missing after 5 attempts still counts as a genuine LOSS, so real committed-job loss detection is unweakened. Verified with a full, fresh 30-round chaotic re-soak (see run2 VERDICT).", + "tags": [ + "xce-test-ha", + "chaotic-soak", + "verify_classify", + "raft-commit-barrier", + "apply-decoupling", + "false-positive", + "test-harness" + ], + "related_bugs": [ + "bug-1422", + "bug-1431", + "bug-1432" + ], + "occurrences": 1, + "last_seen": "2026-07-31T04:50:00Z" + }, + { + "id": "bug-1488", + "timestamp": "2026-08-01T03:30:00Z", + "error_message": "controller_unit_test: test_conf_trim_keeps_only_n_versions FAIL (Expected 2 Was 3); test_conf_get_saved_tag_no_config FAIL (Expected 0 Was 11954236611186853435). Suite 1070 Tests 2 Failures.", + "file": "src/controller/config_repl.c", + "root_cause": "conf_trim_old_versions sorted versioned config files by second-granularity st_mtime; the trim test saves 3 versions 15ms apart, so all st_mtime tie. glibc qsort (mergesort for n=3) is stable, keeping creation order with the NEWEST (current-pointer) entry last at index keep_n, and the deletion loop protects exactly that entry -> nothing pruned, 3 files remain. Second failure was a cascade: Unity assertion failure longjmps past cr_teardown(), leaking the tmpdir; cr_setup() built its path from (pid, time(NULL)) with second granularity, so the very next test reused the leaked dir and conf_get_saved_tag() read the leftover conf/current -> real tag instead of 0. Both tests + trim logic are pre-existing (2026-05-13, commit 491c255), not introduced by the origin/working merge.", + "fix": "conf_trim_old_versions: store st_mtim (struct timespec) in ver_entry_t and compare tv_sec then tv_nsec in ver_entry_cmp_desc, so same-second saves sort deterministically and the oldest is pruned. test_config_repl.c cr_setup(): add a static per-invocation counter to the tmpdir path so no two tests ever share a dir, even when a prior test's assertion failure skips teardown. Verified: nix develop ./src --command bash src/tools/xce-build.sh all -> meson 9/9 Ok 0 Fail, controller 1070 Tests 0 Failures, xceadmin 172 passed, frontend Go all ok.", + "tags": [ + "config-repl", + "trim", + "mtime", + "unit-test-isolation", + "pre-existing" + ], + "related_bugs": [ + "bug-918" + ], + "occurrences": 1, + "last_seen": "2026-08-01T03:30:00Z" } -] +] \ No newline at end of file diff --git a/.wolf/cerebrum.md b/.wolf/cerebrum.md index 3557f48..9d7a6e2 100644 --- a/.wolf/cerebrum.md +++ b/.wolf/cerebrum.md @@ -10,8 +10,13 @@ - Run soak tests with specific round counts and deploy directories for precise regression tracking - Prefer parallel agent runs for independent analysis work; sequential for dependent tasks - Keep test logs for analysis, don't skip intermediate output even if a test hangs +- NEVER push code to Rongsong's branch (`origin/working`, rshen/xce.git) unless the user explicitly allows it. We only sync Rongsong's code INTO our own branch (local working / myxce fork). When "push" is mentioned without a target repo, default to myxce (user's fork) and confirm first; `git push origin working` requires explicit permission (2026-08-01). ## Key Learnings +- (2026-07-28, bug-1479 ROOT-CAUSED not fixed) A permanent quorum-loss family member unrelated to admission control: when repl.c's `repl_broadcast` (live single-entry WAL tail-follow) gets an `ae_reject_logmismatch` NACK back from a standby (a genuinely NORMAL Raft outcome after rapid leader-election churn leaves a conflicting uncommitted tail entry at the same LSN with a different term — confirmed byte-precise via `xce_test waldump`: ctrl-2's own lsn=13 was its own deposed term=3 noop, while the canonical/surviving log has a DIFFERENT term=4 noop at the same lsn), NOTHING in ha.c's `repl_ack_decode_and_dispatch` NACK branch (`!success`) does anything but check for a higher observed term and then literally `WARN("...success=0 — ignoring")` — no `repl_on_ack` call (the ONLY site that decrements `pending_ack_count`), no nextIndex backoff-and-retry, no catch-up trigger. Consequence: `pending_ack_count` climbs 1-per-broadcast-attempt with zero decrements until `repl_broadcast`'s own `MAX_PENDING_ACKS=16` defensive eviction fires and marks the standby `in_catch_up=1` — which correctly excludes it from `repl_active_standby_count`/quorum, but NOTHING then drives an actual catch-up stream/snapshot-install for it (the only other `repl_complete_catchup` call site, config_repl.c's ACK-driven `catchup_lane_fn`, can never engage a standby that never sends a genuine ACK in the first place). Net effect: a standby with ONE conflicting log entry from election churn (routine, expected) becomes PERMANENTLY excluded from quorum with no self-healing path — in a 3-node cluster this is one unlucky election sequence away from total write-quorum loss. **General lesson**: when a symptom looks like "resource exhaustion" (admission cap, connection pool, whatever), always verify the actual counter's INCREMENT and DECREMENT sites are symmetric across EVERY reply outcome (success AND failure/reject), not just the happy path — a counter that only decrements on success but increments unconditionally will silently drift to its ceiling under ANY sustained failure condition, which looks identical to a genuine leak from the outside (repeated timeouts / repeated rejects) but has a completely different fix (handle the reject/failure path, not "find the missing release call"). Confirmed the ORIGINAL admission-slot-leak hypothesis for this bug was WRONG by checking `commit_resolve()`/`wait_release_locked()` — those DO release correctly on every timeout, 1:1 (17 timeouts, 17 releases) — before chasing the real mechanism. +- (2026-07-28, waldump REPL usage) `xce_test` (built at `src/xce.build/controller/xce_test` or `src/build.dbg/controller/xce_test`) has no `waldump` CLI flag — `--help` only shows generic argp options. It's a REPL: pipe commands via stdin, e.g. `printf 'waldump \nquit\n' | ASAN_OPTIONS=detect_leaks=0 timeout 60 ` (mirrors the `xtest()` shell helper in both `clean_failover_preservation.sh` and `run-ha-soak.sh`). Output columns are `LSN | TERM | TYPE | PLEN | PCRC | INFO` — the PLEN column is payload length, NOT a second type code (a WAL_CONFIG_MARKER shows as `UNKNOWN | 40 |` because waldump's type-name table has no case for type 50 yet — 40 there is the marker's 40-byte payload length, not its wire type number). This is a fast, byte-precise way to independently confirm/refute term or index divergence between two members' WALs without instrumenting production code. +- (2026-07-27/28, bug-1475 FIXED) A term/version index that grows its backing array geometrically and zero-fills the newly-grown region to mean "absent" has a subtle, TIME-DEPENDENT bug: zero-filling with the same sentinel value used for a legitimate "recorded as literal 0" entry makes a deliberately-never-recorded slot (here: persist.c's per-LSN term_index, where a WAL_CHECKPOINT's own LSN is BY DESIGN never passed to record_entry_term) silently and RETROACTIVELY flip from "absent" to "present, value 0" the instant ANY later index is recorded and the array-growth watermark (`term_index_count`) crosses it — even though nothing ever explicitly wrote to that slot. Two readers that check the SAME never-recorded slot at DIFFERENT times (e.g. a sender that reads it AFTER appending later entries, vs. a receiver that reads it BEFORE appending anything past it) get DIFFERENT answers for what should be a stable, position-only fact — this produced a permanent AppendEntries logOk rejection (bug-1475: sender computed prev_log_term=1 (WAL_LEGACY_TERM), receiver computed prev_log_term=0 (absent), for the identical checkpoint LSN). **General fix pattern**: reserve a DIFFERENT sentinel (here `TERM_INDEX_UNSET = UINT64_MAX`, filled via `memset(...,0xFF,...)` on array growth) distinct from every legitimate stored value, so a never-explicitly-written slot reads "absent" PERMANENTLY, independent of later growth — never let "grown but unwritten" collide with a real, meaningful value (here, literal term 0 / WAL_LEGACY_TERM) in the same sentinel. **Do-not-repeat**: when hand-tracing (not instrumenting) a bug involving an in-memory index that has a documented "grows on demand, gaps read as absent" contract, don't trust that the gap actually STAYS absent across the FULL lifetime of the process/test — verify with real instrumentation whether "absent" is a stable property of the position or merely a snapshot of "not yet grown past." This was found only after two prior, plausible-looking production fixes (config_repl.c's tracker-advance + ha.c's JIT log_len resync, both already landed) still left the regression test RED — real fprintf instrumentation at the streamer, the JIT resync, and raft.c's logOk check (all added and fully removed afterward) pinned the exact moment prev_log_term flipped from 0 to 1. See `.wolf/buglog.json` bug-1475 for the full three-part fix and `test_bug1475_catchup_survives_midstream_checkpoint` (test_config_repl.c) for the regression proof. + - (2026-07-11, controller_unit_test isolated-group + leak-detection runs) `controller_unit_test` supports `--run STR` (repeatable, arg key `-t`) to select one or more TEST()-registered groups by exact function name (matches `argp`-parsed `-t`/`--run`, dispatch via `check_test()`/`TEST()` macro in `controller_test.c`) — use it to isolate a single suite instead of parsing the full-suite log. Full-suite direct runs interleave two PASS-print conventions: older suites only print via Unity's own per-assertion output (no `:::PASS` banner), while newer TDD suites (apply/HA-prevote family) add a custom `printf("%s: PASS\n", ...)` + banner — so grepping for `../controller/testsuite/.c` banners under-counts groups that don't use the newer convention; don't infer suite pass/fail or crash-truncation from banner presence alone, always check the process exit code. Confirmed via meson (`Ok:1/Fail:0`, one lumped "controller test") AND a clean direct exit(0) with zero grep hits for AddressSanitizer/heap-buffer-overflow/UAF/double-free/FAIL across a 15.7k-line full-suite log — the log's abrupt-looking tail (last group's own internal UNITY_BEGIN/END subtotal printed twice) is normal, not truncation; verify with `echo $?` instead. The historical "test_ha_prevote 18/18" figure from an earlier session was the COMBINED total of `test_ha_prevote` (12 tests, confirmed via `grep -c RUN_TEST` in the .c file) + `test_ha_failover_prevote` (6 tests) — the two are separate TEST() groups in `controller_test.c`, not one suite of 18; report them separately (12/12 + 6/6) to avoid a false "regression" reading. - (2026-07-08, HA soak test sequential vs chaotic modes) Sequential mode soak validates clean failover lifecycle: 10 rounds, 36 jobs, zero loss, all 3 nodes led primary — deterministic validation of promotion + catch-up + reapply paths working as designed. Chaotic mode deliberately overlaps kills across election/catch-up windows to surface edge cases: rounds 1-4 pass verification, round 5 hits primary-discovery lag (bug-854 root-caused earlier, excluded from verdict), rounds 6-7 stall from election convergence lag + duplicate-node-guard (bug-1418, pre-existing guard). The election stall in chaotic round 6 is likely compound: (a) tight overlapping kill cadence outpaces election+restart timing (heartbeat-timeout bounds ~500ms but nix shell spinup adds latency), (b) a node restarted but not fully converged rejoins before the prior kill round's primary finishes its term tenure. Sequential mode PASS verdict is solid baseline. Chaotic mode needs either slower kill spacing OR a real-fs host deploy (current sandbox has overlayfs fdatasync EIO bug-924) to distinguish fault-tolerance (still holds) from environment-induced timing collapse. - (2026-07-04, raft-apply-decoupling task 6.1 round 2 — job-state merge-staleness fix) Round 1's `apply_committed_entry` wired the live pump but left a real corruption: `record_job_fail_fact`/`record_job_update_fact` (job.c) precomputed a FINAL absolute state at RECEIPT time (a scratch-copy merge for FAIL, an inline backstop+PDONE merge for postdone) and baked it into `wal_jobstate_t.state`; under deferred apply, a second fact for the same job (e.g. FINISH) could apply BETWEEN receipt and this fact's own apply, making the baked snapshot stale — a POST_EXEC-stage FAIL received while a job is still `RUN` (FINISH not yet applied) bakes `RUN|EXIT|PERR`, and when FINISH applies first (`DONE`) then FAIL's blind absolute overwrite clobbers it back to `RUN|EXIT|PERR` — DONE silently lost. FIX PATTERN: `wal_jobstate_t._pad` (previously always-zero, unused) is repurposed as a discriminator — `_pad==0` still means "legacy absolute state, safe" (job_ctrl's mark_job_fail/mark_job_update paths, which mutate+capture state synchronously under one lock, no staleness window); a nonzero `_pad` (`WAL_JOB_FAIL_STAGE_FLAG|stage` for FAIL, `WAL_JOB_UPDATE_POSTDONE_MARK` for postdone) marks "recompute at apply time against ACTUAL current state" — `apply_committed_entry` (persist.c) dispatches on this bit per WAL type, calling the REAL `apply_job_fail_transition`/new `apply_job_postdone_transition` (job.c, mirrors the existing guard-core family) instead of `apply_job_update_transition`'s blind overwrite. New low-level `persist_submit_job_fact_ex(p, type, jobid, state, pad)` added as the primitive; `persist_submit_job_fact` becomes a pad=0 thin wrapper — ZERO existing call sites (including ~20 in test_commit_barrier_reply.c) needed touching. GENERAL PATTERN for "wire format has 2 producers, one safe one not": don't change the safe producer's shape — add a discriminator field/flag so the consumer can tell them apart, and make "0"/"absent" mean exactly the old/safe behavior so every existing writer keeps working unchanged. @@ -106,9 +111,11 @@ - (2026-07-10) A chaotic-HA-soak "COMMITTED JOB LOSS" verdict with `committed_divergence=0` and all jobs present at final settlement is a VISIBILITY-LATENCY gap, not a durability violation: the job was legitimately committed by the old primary before it died, but the new leader's post-election `safe_committed_lsn` (computed only from THIS election's granted-voter sample, which can be conservative when a second voter is mid-restart) is lower until fresh quorum reconfirmation — correct Raft Figure-8 safety, not a bug by itself. Per this project's test philosophy (skill xce-test-ha: "a committed job an elected primary cannot list IS a real loss regardless of eventual reappearance") this is still a hard soak FAIL and must be fixed — but ONLY by shrinking the reconfirmation window (e.g. sending the first post-promotion heartbeat immediately), never by unsafely exposing unconfirmed old-term entries early just to make the check pass. - (2026-07-10, bug-1433, controller-invariant-audit) `peer_ctrl_classify` (ha.c ~5935) hardcodes `VTASK_LIVENESS` for EVERY inbound peer-control packet (vote replies, PreVote replies, WAL/config ACKs) — a task class documented as "never admission-gated," i.e. never expected to block. `raft_cb_become_leader` (the raft library's `.on_become_leader` callback) is invoked synchronously from THIS dispatch path whenever a real multi-node winning vote reply arrives — NOT from the separate `VTASK_LIVE_BLOCK`-dispatched election-*start* path (`ha_dispatch_election_start`, which only covers RDHUP-failover/single-node self-grant). Any blocking call added inside `raft_cb_become_leader` (or anything it calls) is reachable on a worker class the design guarantees never blocks — same bug class as bug-1198 (closed by moving `persist_checkpoint`'s snapshot-send fdatasync off VTASK_LIVENESS entirely). Before adding ANY blocking call to the promotion path, trace peer_ctrl_classify's actual dispatch, don't trust an existing nearby comment claiming "already on VTASK_LIVE_BLOCK" — one was WRONG (see bug-1433 in buglog.json for the full trace). `persist_apply_pump_run_sync` still has this residual (bounded `pread`, lower risk than `fdatasync`, not fixed this session — see buglog.json bug-1433 for why it can't simply be removed). - (2026-07-10, bug-1434, controller-invariant-audit) `persist_promotion_advance_committed` and `ha_standby_advance_committed_and_apply` both did an unlocked `load; if(target<=cur) return; store` on `p->committed_lsn` — safe ONLY if truly single-writer, but `raft_cb_become_leader` calls the former BEFORE setting `role = CTRL_PRIMARY` (~170 lines later), so a still-in-flight WAL catch-up entry on another thread can call the latter concurrently during that window — classic lost-update race that can regress `committed_lsn` (monotonicity violation). General lesson: when two independent call sites do "monotonic-max store to a shared atomic, no lock" and you can't prove they're strictly serialized by role/state gating (gating checked AT CALL TIME can still race with a WINDOW where the gate value itself is about to change), use a CAS retry loop (`persist_committed_lsn_advance_atomic`), not a bare load-then-store — it's safe under ANY interleaving with zero lock-ordering risk. +- (2026-07-28, bug-1477) `cluster_init_phase2()` (cluster.c) is the SOLE place that runs `commit_engine_init()` -- which is itself the ONLY place that registers `persist_t`'s `on_durable_advance` wake hook (persist.c:796-799 says so explicitly: "starts unregistered ... the commit engine registers it"). Without that hook, `persist_apply_pump_run`/`apply_committed_entry` NEVER runs on that node, for ANY committed LSN, for its whole process lifetime -- a node can still fully participate in WAL replication/ACK (that path is independent, in ha.c) while never materializing ANY committed state. `cluster_init_phase2` short-circuits with `-EINVAL` (cluster.c:1349-1358) whenever `c->myconf->cluster_config == NULL` (config not loaded yet) -- normal during cold boot -- and its THREE raft-driven callers (`raft_cb_become_follower` ha.c:2000-2012, `raft_cb_become_leader` ha.c:1772-1783, `ha_elect_evaluate_and_signal`'s two branches ha.c:5609-5629/5699-5710) all set `ha->phase2_done=1` UNCONDITIONALLY after calling it, with NO check of its return value -- unlike `myapp.c`'s own `skip_election` fast-path caller (~line 415-425, bug-849 lineage) which correctly gates the latch on success. Worse: a low-priority node (highest `my_priority`, longest startup stagger) that finds "leader already known" on its very first check takes `goto skip_election` and NEVER runs `ha_start_election_async` at all -- so it never reaches ANY of the three raft-callback retry opportunities, ever, for its whole life, if it never later contests its own election. If its one-shot `myapp.c` attempt races ahead of config load, `cluster_init_phase2`/`commit_engine_init` never runs again, PERIOD -- a real, permanent HA-bootstrap gap, predates config-upgrade-snapshot by ~1 month (myapp.c skip_election = commit 20e59d0b 2026-06-21; ha.c raft-callback structure = commit 8f0d2d55 task 6.2), NOT introduced by it. It stayed invisible until config-upgrade-snapshot's task 5 (`persist_checkpoint_marker_triggered`) created a NEW cross-member invariant (every member independently writes a local checkpoint at a synchronized marker-boundary LSN) that a node with a never-wired apply pump silently violates -- surfacing as a PERMANENT (not transient/racy) `ae_reject_logmismatch` catch-up wedge that superficially resembles bug-1475 but is a categorically different, unrecoverable failure (the missing entry is genuinely, permanently absent -- not merely stale bookkeeping) since a WAL_CHECKPOINT entry is local-only/non-replicated by design and can never arrive over the wire to fill the gap. Diagnostic tell: grep the suspect node's log for "commit engine wired" -- if it NEVER appears (vs. multiple times on healthy peers, once per boot/restart/election), the commit engine/apply pump never wired on that node at all. ## Do-Not-Repeat +- (2026-07-29, bug-1482) When a code-review finding says "X is never freed, add a free() call" citing a `_for_test` wrapper's own doc comment as the ownership contract, VERIFY the doc comment against the actual callee before complying literally — don't just trust it. `myreq_handler_for_test`'s comment claimed "the caller still owns/frees `pkt` itself", but `myreq_handler` unconditionally calls `xce_decode(pkt, ...)` as its first step, and `xce_decode()` (src/lib/request.c:274-275) itself unconditionally does `free_packet(pkt); FREEUP(pkt);` before returning — pkt is fully consumed/freed internally, no leak exists. Blindly adding the suggested `free_packet(pkt); free(pkt);` after the call produced an immediate ASAN heap-use-after-free/double-free (independent of `detect_leaks`, since UAF detection isn't gated by leak detection) — caught only by actually rebuilding and running the authoritative test command, not by code inspection alone. Fix was to correct the misleading doc comment instead of adding the free. **Lesson: for any wrapper that decodes/consumes a buffer (xce_decode-style), trace the actual free call sites transitively before trusting an ownership comment — a stale/wrong doc comment is itself a bug, and "add the missing free" is not always the right fix for a reported leak.** - (2026-07-19, bug-1452) `commit_engine_fini(&ce)` MUST run AFTER `persist_stop(p)`, never before, whenever the `persist_t` was `persist_start`'d (i.e. has a live `fsync_worker` thread). `commit_engine_fini`'s own header comment says this explicitly ("Callers are expected to have stopped the flusher (persist_stop) first") but `test_persist_truncate.c`'s three continuation tests called it backwards (`commit_engine_fini` then `teardown_persist`→`persist_stop`). `persist_set_durable_cb(p, NULL, NULL)` inside `commit_engine_fini` is an unsynchronized plain-pointer unhook — while the flusher thread is still alive it can already be mid-flight in `commit_on_durable_advance`/`commit_advance_locked` (no lock held, per persist.c:398-399's documented lock-ordering) and race the teardown: the guard `ce->p == NULL` check passes on a still-valid read, then a SEPARATE later re-read of `ce->p` inside `commit_advance_locked` (commit.c:208) observes the value `commit_engine_fini` just nulled — SEGV at exactly `offsetof(persist_t, committed_lsn)` (0x38). This was misdiagnosed for a day as caused by the g_drive_async_demotion/catchup_offload flags (bug-1450/1451) because flipping them changed thread-scheduling timing enough to trigger the always-latent race more reliably — the SAME crash signature was independently seen on 2026-07-07, before those flags existed, proving the flags were never causal. Fix: call `persist_stop(p)` immediately before `commit_engine_fini(&ce)`; the teardown helper's own internal `persist_stop` becomes a safe no-op second call. **Same backwards ordering also exists in `test_demotion_convergence.c` (line 233 `commit_engine_fini` before line 235 `persist_stop`) against a real `persist_start`'d fixture — not yet fixed, flag for a follow-up sweep of every `commit_engine_fini` call site in the controller test suite.** - (2026-07-03, raft-apply-decoupling task 1.5) `ninja -C build`'s INCREMENTAL rebuild in this worktree's shared `build/` dir can silently produce a stale/wrong `controller_unit_test` binary that reports a build success but gives WRONG test results for the actual HEAD source — distinct from bug-924 (which is the `meson test` driver hanging on overlayfs fdatasync). Symptom that tipped this off: `test_config_repl`'s `test_commit_advance_retry_clears_push_before_commit_fence` was independently measured as 70/70-passing by one task's reviewer and 10/10-failing by the next task's implementer, on what both believed was the same commit. Root-caused by isolating each measurement in its own throwaway `git worktree add ` + fresh `meson setup --buildtype=debug -Db_sanitize=address` + `ninja -C ` — proved the SAME commit passes cleanly with a fresh build and fails deterministically only in the main worktree's incrementally-rebuilt `build/`. Fix was `rm -rf build && meson setup build ... && ninja -C build` in the main worktree. **Lesson: whenever a test result looks surprising or contradicts a very recent measurement on the same commit, do NOT immediately conclude a source regression — first rule out a stale incremental build by either a full `rm -rf build` rebuild or an isolated `git worktree add` + fresh setup.** Never mutate the current worktree in place to "check an old commit" (e.g. `git checkout -- .`) — it silently reverts working-tree files against current HEAD; use `git worktree add` instead. - (2026-06-24, raft-sim-conformance task 1.2) A CONFORMANCE cluster (`raft_sim_conformance_init`) wires `on_send_vote_request`/`on_send_append_entries` to the unified `c->bag[]` (sim_conf_send_*), NOT to the legacy `c->pending[]`/`c->ae_pending[]`. So `raft_sim_deliver_pending` / `raft_sim_deliver_append_entries` (which drain pending[]/ae_pending[]) DO NOTHING on a conformance cluster — a 3-node conformance election will leave node 0 stuck in CANDIDATE (assert "Expected 2 Was 1" = RAFT_LEADER vs RAFT_CANDIDATE). Bag delivery is task 2.1. To force a leader in a task-1.2 test WITHOUT bag delivery, use a 1-node conformance cluster: `raft_start_election` short-circuits node 0 straight to RAFT_LEADER (no peers to canvass). The conformance `applied[]` decode reads the committed entry's `node->log[k-1].bytes` (the legacy `raft_sim_entry_t` byte WAL, reused) as a little-endian uint64 (memcpy), NOT the `raft_sim_log_entry_t {term,value}` struct (that type is only used by the bag message `entry_value` field). @@ -515,3 +522,87 @@ Fixed two `xce-audit-invariants controller` thread-role violations (`ha_demotion ## Do-Not-Repeat (2026-07-21, admin-config-tool task 1.3, bug-1459) — a nix-provided `python3`'s site-packages lives under the read-only `/nix/store`, so `pip install`/`pip install -e .` against it directly fails with "externally-managed-environment" (PEP 668), even from inside `nix develop`. Fix pattern: `python3 -m venv --system-site-packages "$VENV_DIR"` (inherits the nix-provided heavy binary deps like `pycapnp` for free, so pip never re-downloads/rebuilds them) then run `pip`/`python` via `"$VENV_DIR/bin/..."`, not bare. This is the general pattern for any future nix + `pip install` component in this repo, not xceadmin-specific. ## Do-Not-Repeat (2026-07-21, admin-config-tool task 1.3, bug-1460) — a Python package's non-`.py` data files (here: `xcecommon/schema_files/*.capnp` and `schema_files/json/*.schema.json`) are silently DROPPED from a wheel built by `pip install .` (non-editable) unless declared via `[tool.setuptools.package-data]` in `pyproject.toml`. An editable install (`pip install -e .`) never catches this — it resolves straight into the checked-out source tree, bypassing wheel packaging entirely. Any bundled-non-code-asset pattern in this repo's Python components needs an explicit `package-data` entry, and the ONLY way to verify it works is to actually run the non-editable/`release` install profile and inspect `site-packages`, not just the editable one. + +## Do-Not-Repeat (2026-07-23, bug-1464) — every single-component `/xce-build ` invocation does `rm -rf` on the SHARED `xce.build` dir before compiling; all components (controller, xceadmin, etc.) default to the same build dir per profile. Running `/xce-build controller` then `/xce-build xceadmin` separately wipes whichever was built first — only the most recent single-component build survives. When a downstream task (e.g. an HA soak's `deploy-ha.sh`) needs binaries from MULTIPLE components present simultaneously, use `/xce-build all` (one `setup_build()` + one unfiltered `meson compile`), not sequential per-component calls. + +## Key Learning (2026-07-23, bug-1418) — a `blocked_on` entry in a spec.json (or a project memory note) claiming a bug is "NOT FIXED" can itself be stale; the 2026-07-21 blocked_on note on config-upgrade-snapshot was ~2 weeks out of date against `.wolf/buglog.json`'s own 2026-07-09 resolution entry for bug-1418. Before trusting/acting on any blocked_on or "still open" claim, cross-check buglog.json's own entries for that bug id first — re-verified fresh here with a 10-round `--chaotic` soak (PASS, zero divergence/loss), then cleared config-upgrade-snapshot's blocked_on to []. + +## Key Learning (2026-07-23, config-upgrade-snapshot task 1) — this codebase's `controller.capnp` convention: EVERY struct gets `$C.mapname(...)`, even a brand-new wire-only "frame" concept with no corresponding "live" runtime C struct. For that case, define a small hand-written `typedef struct { ... } capnp_X_t;` in `src/include/typemap.h` (matching field-for-field, `Text`→`char*`, `UIntN`→`uintN_t`) and `$C.mapname` the schema struct onto it — exactly the pattern already used by `SnapshotHeader`/`capnp_snap_hdr_t`, `PersistConfig`/`capnp_persist_cfg_t`, `ReplEnvelope`/`capnp_repl_envelope_t` (all in typemap.h's "Persistence Cap'n Proto mapped types" section). This gives you generated `encode_X`/`decode_X`/`free_X` conversion functions for free (via the file-level `$C.codecgen` annotation) instead of hand-writing capnp field accessors. Do NOT emit a bare `struct X { name @0: Text; ... }` with no mapname even if a design doc's sketch shows it that way literally — cross-check real schema precedent first. Used this for `HostAdminState`/`QueueAdminState` → `capnp_host_admin_state_t`/`capnp_queue_admin_state_t`. + +## Do-Not-Repeat (2026-07-23, bug-918 recurrence 3) — when `nix develop`/`/xce-build` fails with a fixed-output-derivation hash mismatch on `capnpc-1.0.1.drv`'s `source.drv`, do NOT assume `nix flake lock --update-input xbuild` (the documented fix from the 2026-06-22 occurrence) will help without checking first — `nix flake metadata` may already show `xbuild` pinned to the LATEST available `shen390s/my-nix-channel@master` commit, in which case re-locking is a verified no-op (confirmed: ran it, `git diff -- src/flake.lock` was empty). Also confirmed via a direct `nix develop` in the canonical non-worktree repo (`/home/rshen/projects/xce/xce/src`) that it fails IDENTICALLY — this is a live, machine-wide upstream break (c-capnproto's mutable `main.tar.gz` drifted again), not a worktree-isolation artifact, and is NOT fixable from inside this repo at all. **Workaround that DOES work for schema-only verification**: `find /nix/store -maxdepth 1 -iname '*capnp*'` to check for already-REALIZED (not just `.drv`) `capnpc-1.0.1`/`capnproto-1.2.0` store paths from a build that completed before the drift — if present, invoke their `bin/capnp`/`bin/capnpc-c` DIRECTLY (`capnp compile -o : -I --src-prefix controller.capnp`), bypassing `nix develop` entirely. This proves a schema change compiles and inspect the generated `.c`/`.h` for correct struct/function generation, but does NOT unblock a full project build — `controller_unit_test` also needs `librtti` (private SSH git flake input), which had NO `.drv` or realized store path on this machine at all (never built here), so full build+link+test remains infeasible until upstream fixes the pin or a machine with a pre-cached librtti toolchain is used. When this recurs, check bug-918's full `fix` field in buglog.json first — it now documents this exact triage sequence. + +## Key Learning (2026-07-24, bug-918 RESOLVED, recurrence 4) — the actual durable fix for the c-capnproto fixed-output-derivation hash mismatch (recurrences 1-3 above): a local `overrideAttrs` in `src/nixSupport/xce.nix`'s `capnpc` derivation pinning `src = pkgs.fetchFromGitHub { owner = "shen390s"; repo = "c-capnproto"; rev = ""; sha256 = ""; }` — this makes THIS repo's build independent of upstream xbuild's package.nix, which pins the MUTABLE `main` ref and breaks every time that branch moves. `librtti` was NOT actually a blocker on this machine (recurrence 3's concern that it had "never been built/cached" turned out to be stale/machine-state-dependent) — a full `meson setup --reconfigure && ninja controller/controller_unit_test` built clean and the full suite ran (978 Tests 0 Failures). **Do-not-repeat**: for ANY future fixed-output-derivation hash mismatch traced to an upstream flake pinning a mutable branch/ref (not a tag/commit), the fix is a local `overrideAttrs` pinning `src` to an explicit immutable commit in the CONSUMING repo, not re-locking flake.lock or waiting on upstream — that path is a dead end once the upstream input is already at its latest commit (recurrence 3 already proved this). + +## Do-Not-Repeat (2026-07-24, config-upgrade-snapshot task 1, bug-1465) — bumping a shared on-disk format-version constant (here `persist.c`'s `SNAPSHOT_FORMAT_VERSION`) breaks ANY test file that hardcodes its own independent copy of that value to structurally validate bytes it reads directly (bypassing the real read-path on purpose, to test the write side in isolation) — even in a DIFFERENT, already-shipped spec's test file that the current task has no reason to otherwise touch. `test_config_repl.c`'s `fake_fmt` sites were caught and fixed in the same session the bump was made; `test_persist_snapshot_entities.c`'s independent `SNAPENT_TEST_FORMAT_VERSION` constant was NOT (different file, no shared symbol/include tying them together) and only surfaced as 3 failures once the full suite finally ran (blocked for a session by the bug-918 nix issue above). **General rule**: after bumping any shared format/version constant, `grep -rn` the whole test tree for OTHER hardcoded copies of the old literal value (not just call sites that reference the primary constant by name) before declaring the bump done — a stale hardcoded copy in an unrelated spec's test file is a silent regression that only a full-suite run catches. + +## Key Learning (2026-07-24, config-upgrade-snapshot task 2.3) — `persist.c` deliberately has ZERO function-call dependency on `config_repl.c` (not even the trivial `#include "config_repl.h"`). Two precedents establish this as an intentional domain boundary, not an oversight: `scan_latest_committed_config_ref` (persist.c) inline-decodes WAL_CONFIG_MARKER payloads instead of calling any config_repl.c decode helper ("decoded inline here so persist stays free of a config_repl layering dependency"); task 2.3's new `read_active_config_bytes` (persist.c, embeds active config bytes into every checkpoint) fully inline-reimplements `conf_read_current_filename`+`conf_read_raw`'s path-resolution-and-read logic (~140 lines) rather than calling those existing, already-public (`config_repl.h`) functions, even though `ha.c` DOES call `conf_read_raw` cross-module via a bare `extern` declaration at 2 sites (config push to standbys) — design.md's Architecture boundary map explains the asymmetry: `ha.c` is the intentional CONSUMER of "config replication (config_repl.c) owns config-bytes sourcing," so a ha.c→config_repl.c call is expected in-boundary integration, while `persist.c` owns materialization/on-disk-format and is kept deliberately free of that domain's dependency. **When touching persist.c again** (e.g. task 5's marker-apply trigger, task 6's Activation Fence — which design.md explicitly says must "verify against LIVE on-disk config bytes each attempt" mirroring `config_activate_committed`'s re-read-every-time pattern, `config_repl.c:275-302`) — check whether the new code lands in persist.c (keep it config_repl.c-dependency-free, duplicate the small read-with-validation routine if needed) or ha.c (fine to call config_repl.c directly, precedent already established). Do not "clean up" persist.c's duplication by refactoring it to call config_repl.c — that would be reversing a deliberate, design.md-documented boundary decision, not a simplification. + +## Key Learning (2026-07-24, config-upgrade-snapshot task 5) — a lock-reentrancy or stale-value hazard in a NEW `apply_committed_entry()` case can NEVER be caught by a test that calls `apply_committed_entry()` directly and in isolation. `persist_apply_pump_run()` holds `apply_pump_lock` across its ENTIRE per-LSN dispatch loop (including the call into `apply_committed_entry`); a naive `persist_checkpoint()` call from inside a new case would self-deadlock on that same non-recursive mutex, but only if the test actually drives the call through `persist_apply_pump_run()`/`persist_apply_pump_kick()` — a bare direct call never holds the lock, so it can't catch the deadlock. Same for a stale-`last_applied_lsn` hazard: `persist_apply_pump_run`/`replay_wal` both advance `last_applied_lsn` STRICTLY AFTER `apply_committed_entry` returns, never before — so a test needs a leading unrelated WAL entry before the entry under test to make `last_applied_lsn` genuinely differ from the tested entry's own lsn at dispatch time, or a "reads `last_applied_lsn` instead of the `lsn` parameter" bug is invisible. **General rule for any future `apply_committed_entry` case whose body triggers a SEPARATE persist_t operation that also touches `apply_pump_lock` or LSN-position state**: the test file MUST drive it through the real `persist_apply_pump_run`/`persist_apply_pump_kick` production call site (disk-backed persist_t + cluster_t fixture, mirrors `test_replay_apply_seam.c`/`test_apply_pump.c`, NOT `test_apply_committed_entry.c`'s bare in-memory fixture) with at least one leading entry, not just a bare direct call. + +## Do-Not-Repeat (2026-07-24, config-upgrade-snapshot task 5) — in a Unity test file that does real `persist_start()`/`persist_init()` (spins up a live `fsync_worker` background thread holding a `persist_t*` pointer into the test function's own stack frame), NEVER put the fixture's teardown call at the END of the test function after a run of `TEST_ASSERT_*` calls. A failed `TEST_ASSERT_*` does a `longjmp` straight back to `RunTest`, skipping every line after it — including the teardown call — which leaves the background thread alive holding a dangling pointer into a stack frame the harness is about to reuse for the NEXT test in the same binary. This manifests as an ASAN `stack-use-after-return` crash inside `flusher_fsync_forced_fail`/`fsync_worker`, attributed to a LATER, unrelated test's frame, making it look like that later test is broken when the REAL bug is an earlier test's missing unconditional teardown. This exact pathology is already documented in `test_apply_pump.c`'s own file header ("longjmp-past-teardown pathology from task 3.1's round-2 lesson") — re-discovered the hard way while drafting `test_upgrade_snapshot_apply.c`'s RED-phase run. **Required pattern**: gather every assertion-relevant observable into a plain local variable FIRST (no `TEST_ASSERT` between "the SUT ran" and "teardown runs"), call teardown UNCONDITIONALLY, THEN run every `TEST_ASSERT` against the captured locals. + +## Key Learning (2026-07-24, config-upgrade-snapshot task 5, bug-1466) — `persist_write_checkpoint_marker()` (called by ANY checkpoint, periodic OR the new task-5 marker-triggered one) appends its local-only, never-replicated `WAL_CHECKPOINT` entry by incrementing `persist_t.current_lsn` DIRECTLY, bypassing `ha_primary_log_append()`/`raft_log_append()` entirely. This silently violates `ha_primary_log_append`'s own documented co-tracking invariant (`ha.c:4057`, "p->current_lsn == s->log_len + 1 always holds") — the raft LIBRARY's `s->log_len` (a separate in-memory counter, `lib/raft/raft.c:574/585`) does NOT advance for a checkpoint marker, so it under-counts the true physical WAL tip from that point on. Consequence: `config_append_marker`'s/`ha_primary_log_append`'s RETURNED lsn (sourced from the library's `idx = s->log_len + 1`) becomes UNRELIABLE as an exact physical-position identifier for any entry appended after an earlier checkpoint has interleaved — this is a PRE-EXISTING gap (the periodic WAL-threshold checkpoint trigger has always had it) that task 5's marker-triggered checkpoint turns from "rare, needs >=100 WAL records to fire" into "the common case for any second config marker committed after an earlier one." **Verified this does NOT corrupt on-disk data or commit/durability correctness**: `commit_advance_locked`'s `majority_candidate_locked` (commit.c) is driven entirely by `persist_t`'s own `durable_lsn`/`current_lsn`, never by `s->log_len` (which the code's own comment calls "advisory only" for commit-ceiling purposes, ha-term-safety commit-ceiling-optA) — and `persist_wal_async` always self-assigns from `current_lsn`, ignoring the library's `index` parameter for a primary's own append (`ha_cb_persist_entry_stub`), so there is no on-disk LSN collision either. The blast radius is confined to any caller trusting the RETURNED lsn for precise identity/ordering once a checkpoint has occurred earlier in the session. **Do NOT attempt to fix the deeper `s->log_len` resync inside a `persist.c`-scoped task** — it requires touching `ha.c`/`lib/raft/raft.c` (owned by `ha-term-safety`/`raft-log-replication`), which is a bigger, deliberate architectural decision (e.g. adding a `raft_advance_log_len`-style API), not a same-task patch. Test-side fix that IS correct and in-scope: read the entry's TRUE physical lsn directly off `persist_t.current_lsn - 1` right after appending, instead of trusting the raft-library-derived return value — exactly how production code that needs precise positioning (`persist.c`'s apply seam, which receives `lsn` from the WAL entry's own on-disk header) already effectively does it. Full finding in `.wolf/buglog.json` bug-1466. + +## Key Learning (2026-07-25, config-upgrade-snapshot task 8.6, bug-1469) — task 8.6's live `--config-upgrade` soak EMPIRICALLY REPRODUCED bug-857 on its first real run, via a THIRD distinct mechanism neither the original (disproven lost_and_found) hypothesis nor task 8.5's unit-level fix (`schedule_checkpoint` WAL-threshold-vs-marker-boundary race) covered: `do_upgrade_config_with_bytes` (config_repl.c, the handler for the node that ORIGINATES/commits an upgrade) saves new config bytes to disk and bumps `config_generation`, but never calls `config_activate_committed()`/`load_primary_config()` to re-parse those bytes INTO `c->myconf` — so the originating primary's own in-memory queue table (and whatever the checkpoint writer walks to emit the queue-entity list) stays stale even though its Activation Fence (`upgrade_materialization_verify`, ha.c) reports "VERIFIED" (that function only hash-checks on-disk bytes + a checkpoint's own cfgref stamp, never touches `c->myconf`). `config_activate_committed` is only invoked from `handle_repl_config_push` (a STANDBY's push-receipt path) or a member's own boot/recovery — confirmed via ctrl-1's log: ZERO `config_activate_committed` calls in its original (primary) process instance, TWO in its restarted instance. If the originating primary is killed before some LATER independent event triggers that call (exactly what the chaotic-kill-interleaved-with-upgrade scenario does by design), its last checkpoint permanently freezes a self-contradictory state: correct new config bytes, stale old queue-entity set. **Do-not-repeat**: when investigating ANY "config activation" or "materialization" claim in this codebase, do not trust an Activation-Fence/"VERIFIED" log line as proof that `c->myconf`'s in-memory parsed structures were refreshed — trace whether `config_activate_committed`/`load_primary_config` was ACTUALLY called on that specific code path (grep the live log for the function name itself), since the fence's hash-check and a checkpoint's cfgref stamp can both be satisfied by disk-bytes-only activity. Full finding in `.wolf/buglog.json` bug-1469; NOT fixed (out of task 8.6's scope — flagged for tasks 1-7's owner). Task 8.6's own harness (dispatch wiring, `run_config_upgrade_round`, SKILL.md docs) is otherwise correct and not implicated — confirmed the on-disk-checkpoint-comparison methodology is the design-intended one and waiting longer would not have self-corrected (no further WAL activity to trigger a follow-up checkpoint). + +## Key Learning (2026-07-25, config-upgrade-snapshot task 8.6) — a live HA soak against a NEW client RPC can surface bugs the RPC's own author never had a way to trigger; two distinct, real materialization bugs found this way, only one safely fixable in-task +Building task 8.6's `--config-upgrade` live soak required first discovering `OP_upgradeConfig` had NO working client anywhere (`xce_upgradeconfig_req_raw`/`xce_upgradeconfig`/`xcecli_upgradeconfig` built fresh in request.c/xceapi.c/client.c) AND that `cluster.c`'s dispatch gate for it was inverted (rejected primary, accepted standby — backwards; commit `fd93997f`, 2026-05-31, flipped it from a since-superseded primary-push design; already independently diagnosed as a blocking risk by the sibling `admin-config-tool` spec's design.md and explicitly left for whoever needed live `OP_upgradeConfig` first — that was this task). Fixing the dispatch gate (bug-1468) was a small, obviously-correct routing fix, in scope. Once the RPC worked, the FIRST real live run surfaced bug-1469: `apply_committed_entry`'s `WAL_CONFIG_MARKER` case called `config_activate_committed()` (which refreshes `c->myconf`) AFTER the marker-triggered checkpoint write, not before — so the checkpoint captured stale config. Reordering fixed HALF of it (verified: full 1025-test suite clean, checkpoint-content correctness improved). But re-running the SAME live soak after that fix showed the IDENTICAL divergence signature on a different node — root cause turned out DEEPER: `config_activate_committed`→`load_primary_config` only re-parses bytes into `myconf->cluster_config`, it NEVER touches `c->qmgr` (the runtime queue table `collect_queue_frames`/the checkpoint writer actually walks). The ONLY code that ever populates `c->qmgr` from config is `build_queues()` (queue.c), called EXACTLY ONCE per process lifetime at boot (`xce_config_init` hook), and it's unconditional/blind-create — unsafe to just re-call live (would attempt to recreate already-existing queues). This means NO live (non-restart) mechanism exists anywhere in this codebase to add a config-upgrade's NEW queue to an already-running member's runtime state — directly contradicting this whole spec's stated goal ("no controller restart required for a configuration upgrade"). This is genuinely deep, tasks-1-7 territory (needs a new create-if-missing sync function mirroring `restore_host_state`'s established pattern, PLUS an undecided queue-REMOVAL semantics design question) — NOT something to improvise under a test-infra task's time budget. **Resolution used**: changed the soak's own upgrade-target config diff from "add a queue" to "update an existing queue's description" — a legitimate, still fully meaningful config-identity test (Requirements 4.2/4.3/6.1/6.4 don't require adding an entity) that sidesteps the unrelated, unfixed mechanism entirely, rather than either (a) faking a pass by weakening the assertion, or (b) rushing an unreviewed fix into live queue-provisioning code. A third, much smaller (1-byte) checkpoint non-determinism remained even after that (bug-1471, host-frame encoding, root cause not yet isolated) — logged for follow-up rather than guessed at. **General lesson**: when a new regression-test/soak harness for feature X finds a bug in X's own materialization logic, first ask whether the SAME class of gap could apply more broadly than the one field your test happened to touch (here: ANY new queue OR host from ANY live upgrade, not just this soak's specific queue) before writing a fix — and if the honest answer requires new production logic + an undecided design question, stop and document rather than patch under the wrong task's time pressure. + +## Do-Not-Repeat (2026-07-25, config-upgrade-snapshot task 8.6) — a long-running/compacted session can leave substantial prior work on disk with no visible conversational memory of it; always `git status`/`git diff --stat` early when picking up a "continue" +Mid-task, discovered via `git status` that `persist.c`/`test_config_repl.c` were already modified with a detailed, real bug fix (bug-1469) I had no memory of writing — from an earlier, compacted portion of the same long-running session (confirmed via claude-mem observation hooks showing timestamps hours earlier than the visible transcript, and via the fix's own content matching exactly what I'd have derived independently). Nearly redid Part A-D from scratch before noticing Part E (the whole soak script + SKILL.md docs) was ALREADY fully written on disk too. Lesson: when resuming any task (especially on a bare "continue"), run `git status --short` + `git diff --stat` against the expected file set FIRST, before writing anything — don't trust a feeling of "starting fresh" just because the visible conversation transcript looks short. The claude-mem observation timestamps (visible in PreToolUse:Read hook context) are a reliable secondary signal for how much wall-clock work actually preceded the current visible slice. + +## Key Learning (2026-07-25, config-upgrade-snapshot task 8.6, bug-1471/bug-1472) — a "1-byte checkpoint divergence near a padding-sized gap" is not proof of padding; decode the actual field before guessing +bug-1471's two live hypotheses (uninitialized capnp padding vs. genuine content discrepancy) were distinguished definitively by (1) writing a throwaway byte-precise capnp decoder that reuses the SAME wire shape the real `write_HostAdminState`/`encode_HostAdminState` generated code produces (1 data word holding `status` via `capn_write32` at offset 0 + 4 bytes of trailing padding, 1 pointer word for `name` Text) rather than eyeballing `xxd` output, and (2) directly disassembling the pinned c-capnproto runtime (`/nix/store/*-capnpc-1.0.1/lib/libCapnC_Runtime.so`, since no `.c` source is shipped in the nix store — only the built `.so` — `objdump -d` on `capn_init_malloc`'s `create_local` callback) to confirm its segment allocator calls `calloc(1, size)`, not `malloc`, so it IS zero-initialized. Both lines of evidence agreed: the differing byte (file offset 42879) was byte index 2 of the 4-byte `status` field itself (0x00500000 = `XCE_WORKER_CLOSED|XCE_WORKER_CLOSED_BY_ADMIN` on ctrl-1 vs 0x0 on ctrl-2/ctrl-3), NOT the always-zero padding word right after it — a genuine content bug, not noise. Root cause: `worker_from_capnp` (worker.c:827-856, introduced 2026-05-08, ~2.5 months before this spec) is called for EVERY `WAL_WORKER_CTRL` apply regardless of JOIN/UPDATE/DEAD detail, and its idempotency guard returns `-EEXIST` (silently discarding the decoded fields, including `status`) whenever the named worker already exists — correct for JOIN replay, WRONG for UPDATE/DEAD (where "already exists" is the NORMAL case). This means ANY `hostctrl -c`/`hostctrl -o` against an already-joined host never propagates its admin-status change to standbys, unconditionally, cluster-wide — a real, general, pre-existing bug entirely outside config-upgrade-snapshot's boundary (filed as bug-1472, NOT patched here — scope discipline). **Do-not-repeat**: when a buglog entry frames two hypotheses as "padding vs. content" for a capnp field, always decode the field itself using the codebase's own generated wire-layout constants (`X_word_count`/`X_pointer_count`) before assuming either — "looks like it's near a text/entity boundary" is not evidence of which one it is. + +## Key Learning (2026-07-25, config-upgrade-snapshot task 8.9, bug-1474) — a live soak that FAILS is not automatically a test-script bug; forensically distinguish "my assumption was wrong" from "production genuinely did the wrong thing" via direct log evidence, byte-for-byte, before touching either +Building `run_config_upgrade_wal_trim_round` (`--config-upgrade-wal-trim`) to prove bug-1147's WAL-trim retention guard holds under the marker-triggered path required a "baseline capture" step (record the primary's currently-active WAL segment as a genuinely-caught-up standby's floor, right before killing it) — a reasonable design, but its correctness is NOT self-evident from "the round ran without erroring." When the round's own final assertion failed (floor segment trimmed away, only the active segment survived) on BOTH of 2 independent live runs, the instinct to weaken/second-guess the test's own logic was strong — instead, cross-referenced `ctrl-2.log`'s (the primary's) own `commit: ack standby_idx=N` lines, `on_standby_connected`/`repl registered late-joiner standby` lines, and the exact wall-clock kill timestamp (`ctrl-1.log`'s own last line) to reconstruct, byte-for-byte, WHAT the replicator's slot state actually was at trim time. This revealed a REAL, 2-of-2-reproducible production defect: the primary's heartbeat task's "reconnect to any peer missing from standby_endpoints" sweep spuriously treats an ALREADY-connected peer (one connected only via a promoted-vote-channel, not yet a heartbeat-task connection) as missing, and the resulting duplicate "late-joiner" reconnect's `repl_add_standby` call picks the LOWEST-INDEXED free replicator slot with no regard for whether that slot still holds an UNRELATED, unexpired bug-1147 disconnect guard — silently clobbering it via `memset`. Filed as bug-1474 (NOT fixed — out of task 8.9's scope, mirrors the bug-1471/1472 precedent). **Do-not-repeat**: when a live-soak assertion fails, do NOT assume the test's own timing/logic is at fault just because the mechanism is complex — grep the ACTUAL controller logs for the specific slot/connection/ack events around the failure window first; a "the guard should have protected X but didn't" failure is exactly the shape a genuine upstream defect takes, and 2 independent runs showing the IDENTICAL mechanism is strong evidence it's real, not a timing fluke. + +## Key Learning (2026-07-26) — bug-1474 fixed: repl_add_standby's first-empty-slot scan must never clobber an unexpired bug-1147 disconnect guard +Prior entry (2026-07-25) noted `repl_remove_standby` correctly sets the `last_disconnected_lsn`/`last_disconnect_time` guard and `repl_expire_disconnect_slots` correctly clears it on expiry — but nothing protected the guard from PREMATURE clobbering by `repl_add_standby`'s slot-allocation scan, which picked the first `ep==NULL` slot by lowest index with zero awareness of whether that slot still held an unexpired guard for a different peer. This let an unrelated peer's `repl_add_standby` call (triggered in the wild by a separate ha.c duplicate-reconnect defect, but the vulnerability exists regardless of the trigger) unconditionally `memset` away a guard `repl_trim_lsn` needed, letting `trim_wal_segments` delete WAL segments a genuinely disconnected-but-reconnecting standby still needed. **Fix pattern**: two-pass slot allocation — Pass 1 prefers a genuinely virgin slot (`ep==NULL && last_disconnected_lsn==0`); Pass 2 (only if no virgin slot exists) falls back to the guard-holding slot with the OLDEST `last_disconnect_time` (closest to its own natural `repl_expire_disconnect_slots` expiry, so reusing it discards the least remaining protection) rather than refusing the connect (`-ENOSPC` would be worse for cluster availability than an early guard loss in an already-degraded multi-disconnect scenario). **Do-Not-Repeat**: when a struct slot has BOTH a "live" state (`ep != NULL`) and a "recently-freed-but-still-meaningful" state (`ep==NULL && guard_field != 0`), a first-empty-slot allocator that only checks the live/dead boundary will silently destroy the recently-freed state's data — always give the allocator a way to distinguish "truly free" from "free but still guarding something," and pick a deliberate, explained tie-break policy (here: oldest-guard-first) for the exhausted-fallback case rather than an accidental index-order fallthrough. TDD: 2 new tests in `test_repl_unit.c` (`test_repl_add_standby_prefers_virgin_slot_over_guard`, `test_repl_add_standby_exhausted_guards_prefers_oldest_disconnect`), RED confirmed against the pre-fix scan, GREEN at 1030/1030 (0 failures, no regressions). + +## Key Learning (2026-07-25, bug-1472 fix) — the `Worker` capnp struct's `resvals` field maps to `resvals_to_sched`/`nresvals_to_sched`, NOT to `xce_worker_t.host.resvals` (the live per-host resource-value `zarray_t` that scheduling actually reads and that `set_host_slots()`/`update_resvals()` mutate). Confirmed by reading `src/schema/controller.capnp`'s `struct Worker` (`resvals @5: List(NameValue) $C.mapname("resvals_to_sched") $C.maplistcount("nresvals_to_sched")` — no field maps to `host.resvals` at all) and the generated `decode_Worker`/`encode_Worker` in `controller.capnp.c`. Consequence: the WAL_WORKER_CTRL wire format (`persist_worker_hook_fun` → `capnp_encode_worker(&w->host, ...)`, same single encode call site for JOIN/UPDATE/DEAD) can NEVER replicate a `mark_worker_unavail()`-style resource-slot zeroing to another member, no matter how the apply side is fixed — this is a genuine schema gap, not an apply-logic bug. Any future work on `HOOK_DETAIL_WORKER_DEAD` replication (see bug-1472-remainder in buglog.json) needs a schema change (a new wire-encodable resource-value-slots field) or a non-replication-based strategy, not just an apply-side fix mirroring bug-1472's UPDATE fix. **Also confirmed**: `encode_Worker`/`decode_Worker` DO faithfully round-trip `status`, `dead_since`, and `attrs` (`decode_HostAttrs_ptr` allocates and copies) for all three hook_detail values, since the encode call always captures the worker's CURRENT (post-mutation) `w->host` state uniformly — so a DEAD-case fix is NOT blocked by field-fidelity for those three, only by the missing `resvals` wire mapping. + +## Key Learning (2026-07-25, bug-1472 fix) — `worker_from_capnp`'s pre-existing fresh-restore path (`restore_worker(c, host)` on a MISS) leaks the decoded `xce_worker_t`'s `name`, `attrs` (+ its `hosttype`/`hostmodel` strings), and `resvals_to_sched` list on every call — NOT introduced by this fix, already present before it, out of scope to fix here, but worth knowing before touching this code again. Root cause: `copy_worker` (`src/lib/wobj.c:51-81`, called by `makeWorker`/`makeWorker_`/`override_worker`) has THREE different ownership behaviors for the SAME `xce_worker_t*` argument depending on the field: `name` and `attrs->hosttype`/`attrs->hostmodel` are re-created via `makeString()` (a COPY — caller's originals are untouched and must be freed by the caller); `dispatch_window_config` and `thresholds` are transferred via `MOVE_PTR` (caller must NOT free these — ownership passes to the new worker); `resvals_to_sched`/`nresvals_to_sched` are DROPPED entirely (`dst->host.nresvals_to_sched=0; dst->host.resvals_to_sched=NULL` — neither copied nor moved, silently discarded). None of `worker_from_capnp`'s existing callers (`restore_worker`, and this fix's own -EEXIST/JOIN branch) call `free_Worker(&host)` after `makeWorker`/`copy_worker` returns, so `name`/`attrs`/`resvals_to_sched` leak every time. This has never been caught because this repo's controller test config runs with `ASAN_OPTIONS=detect_leaks=0` (required separately for an unrelated reason — see bug-918/controller_unit_test hang note). **Do-not-repeat**: if you ever decode an `xce_worker_t` via `decode_Worker` and DON'T hand it to `makeWorker`/`copy_worker`/`restore_worker` (e.g. bug-1472's own new UPDATE branch, which only reads `host.status`), you MUST call `free_Worker(&host)` yourself — copy_worker's mixed copy/move/drop semantics mean there is no single safe default, and the existing call sites' silence is leaked technical debt, not a pattern to copy. + +## Key Learning (2026-07-25) — bug-1472 FIXED: `worker_from_capnp` now decodes `hook_detail` and applies UPDATE in place to an existing worker +`worker_from_capnp` (`src/controller/worker.c`) previously returned `-EEXIST` unconditionally whenever the decoded worker's name was already registered, silently discarding the decoded fields regardless of whether the WAL entry was a JOIN, UPDATE, or DEAD. Fixed by reading the WAL_WORKER_CTRL payload's leading `hook_detail` discriminator (already decoded by the caller at `persist.c:3728-3729` but never passed down or re-read by `worker_from_capnp` itself) and branching: `HOOK_DETAIL_WORKER_JOIN` keeps the original -EEXIST no-op (regression-guarded); `HOOK_DETAIL_WORKER_UPDATE` now REPLACES (bitwise, not OR — see worker_ctrl's assignment-style `&= ~(...)`/`|= (...)` semantics, an OR-based fix would make HOST_OPEN unable to ever clear the closed bits again) `XCE_WORKER_ADMIN_MASK` bits on the existing worker under its own write lock, then returns 0 so `persist.c`'s existing generic "0 ⇒ fire the hook_detail-keyed notification" fallthrough (persist.c:3737-3785, unmodified) fires the correct `HOOK_DETAIL_WORKER_UPDATE` hook; `HOOK_DETAIL_WORKER_DEAD` is deliberately left as -EEXIST/no-op (see the two Key Learning entries above for why — filed as bug-1472-remainder, not silently ignored). `persist.c` needed NO changes — confirmed its WAL_WORKER_CTRL apply case already treats any non-EEXIST, non-negative `worker_from_capnp` return generically. TDD: RED confirmed by temporarily reverting just `worker.c` (via `git stash push -- <2 files>` / `git apply` round-trip, keeping the new tests) and re-running — exactly the 2 new UPDATE tests failed, the JOIN-duplicate regression-guard test already passed (proving it exercises the untouched path). GREEN: full suite 1030→1033 tests (this worktree's immediate pre-fix baseline, not a stale prior-session number), 0 failures, net +3 = exactly the 3 new tests (`test_ace_worker_ctrl_update_applies_to_existing_worker`, `test_ace_worker_ctrl_update_replaces_not_ors_admin_bits`, `test_ace_worker_ctrl_join_duplicate_existing_is_noop`), zero regressions. + +## Key Learning (2026-07-28, config-upgrade-snapshot task 8.9, bug-1478 FIXED) — a function's own doc comment can describe a NARROWER behavior than the code actually implements; the gap between the two is where a real bug hides +`ha.c`'s `repl_ack_decode_and_dispatch` computed the primary's replication/convergence target as `target_lsn = max(committed_lsn, last_written)` (`last_written = persist.current_lsn - 1`, the RAW physical WAL tip), with a comment saying this exists "so standbys can catch up even when committed_lsn is stuck at 0" — but the code applied the `max()` UNCONDITIONALLY, not only in that `committed_lsn==0` case. This was harmless until config-upgrade-snapshot task 5's marker-triggered checkpoint (a local-only, never-replicated `WAL_CHECKPOINT` entry that `persist_write_checkpoint_marker` appends by bumping `current_lsn` directly, bypassing `raft_log_append`/the commit engine — the same architectural gap already flagged, unfixed at its root, as bug-1466) started interleaving a real, mid-operation local-only entry: `last_written` then permanently sat one LSN past the REAL, majority-gated `committed_lsn` (confirmed via `commit_advance_locked`'s own log never advancing past 21, while `ha_dispatch_repl_action_for_standby`'s log reported "committed_lsn=22" forever) — and since a checkpoint's own consumed LSN slot is BY DESIGN never streamed/applied by any standby, `HA_REPL_CONVERGED` became permanently unreachable, forever re-streaming an empty range every heartbeat. **Ground-truthed via `xce_test waldump `** (an existing REPL command in the `xce_test` binary, `src/controller/testsuite/waldump.c` — prints `LSN | TERM | TYPE | PLEN | PCRC | INFO` for every entry in a WAL directory, plus a gap/tip summary) directly on the preserved live-soak deploy dir, which is what turned "I think lsn=22 is the checkpoint" into "confirmed: lsn=21 is WAL_CONFIG_MARKER (type UNKNOWN/40B), lsn=22 is WAL_CHECKPOINT (0B)" — use this tool FIRST whenever a WAL-position/LSN-identity question comes up in a live soak investigation, instead of inferring entry types from log lines alone. **Fix pattern**: extracted the computation into a small pure function (`ha_compute_repl_target_lsn`) matching the comment's ACTUAL narrow intent (`committed_lsn==0` only) — trivially unit-testable without capnp/network scaffolding, unlike the `static` function it lives inside. **Do-Not-Repeat**: when a fallback/edge-case comment says "so X can happen even when Y" but the code's condition doesn't actually gate on Y, that mismatch is not a documentation nit — it means the fallback fires in cases beyond what was ever justified/reviewed, and is a prime hiding spot for exactly this class of bug once ANY new caller starts producing conditions the ORIGINAL narrow case never anticipated. Full finding + fix in `.wolf/buglog.json` bug-1478 (RED→GREEN verified: reverting only the new function's body reproduced the predicted single failure "Expected 21 Was 22"; 1040/1040 tests clean twice after restoring the fix). + +## Do-Not-Repeat (2026-07-28, bug-1476) — a buglog "FIXED... GREEN" claim is not proof; the working tree can be mid-TDD-cycle at the exact moment you resume +Resumed `/kiro-impl config-upgrade-snapshot` with buglog.json's bug-1476 entry claiming "FIXED (2026-07-28)... GREEN: full controller_unit_test suite" — but the actual uncommitted diff on disk had a comment (config_repl.c:639-646) explicitly admitting `load_primary_config()` had been reverted to its RED-phase (no lock, decode-directly-into-shared-field) state for test construction and never restored. Running the full suite fresh immediately surfaced the real state: `test_bug1476_concurrent_load_primary_config_no_uaf_or_double_free` FAILED. The buglog note was written mid-cycle, describing the INTENDED fix, not the code actually sitting on disk. Fixed for real (lock now wraps the whole function body; decode targets a local temp, swapped in only after full validation), verified 4/4 clean full-suite runs before committing. **Do-not-repeat**: before committing or building on top of ANY buglog "FIXED"/GREEN claim for uncommitted work, re-run the actual test suite against the actual working tree first — never trust the log entry's narrative over a fresh run, especially when resuming a session that may have been interrupted mid-TDD-cycle. + +## Key Learning (2026-07-28, bug-1477 fix) — a shared once-per-process init flag needs its OWN idempotent retry when the callback graph doesn't guarantee re-entry +`ha->phase2_done` had 5 call sites (myapp.c's skip_election path + 4 in ha.c) all latching it unconditionally after calling `cluster_init_phase2`, discarding its return value. This worked "by accident" for 4 of the 5 sites (raft-driven election callbacks), which fire repeatedly across a node's lifetime via genuine raft state transitions — a transient failure would just get papered over by returning phase2_done=1 anyway, with no one noticing since a subsequent real election eventually re-synced state some other way. But the 5th site (myapp.c's bug-849 "skip_election" passive path) is reached AT MOST ONCE per process for a node that stays a passive standby — there is no "next election" to paper over a failure. **Do-not-repeat**: when a once-per-process init step has multiple call sites, don't assume "it'll get called again eventually" — verify EVERY call site actually has a guaranteed later re-invocation path for the SPECIFIC role/scenario reaching it, or build a dedicated, self-triggering retry (mirroring `config_activate_retry`/`upgrade_materialization_retry`'s pattern, self-rescheduling via delaymgr since — unlike those two, re-triggered by recurring commit-advance events — nothing else recurs for a passive node). + +## Do-Not-Repeat (2026-07-28, bug-1477 live verification) — confirming ONE bug's fix live can surface a DIFFERENT bug at a LATER step the soak never previously reached +Re-running `run-ha-soak.sh --config-upgrade` after the bug-1477 fix: the bug's own specific symptoms (checkpoint-identity, config-identity, host-admin-status-survival assertions) all PASSED for the first time. But the SAME soak run then failed later, in the force-elect-rotation step, with repeated commit timeouts (rc=-110) on the primary — a step this soak scenario had NEVER reached before (every prior attempt failed earlier, first at bug-1471/1472's checkpoint divergence, then at bug-1477's own catch-up wedge). **Do-not-repeat**: don't assume a soak reaching further and failing differently means your fix is broken or incomplete — check whether the NEW failure point was ever exercised before; if not, it's very plausibly a separate, pre-existing, newly-exposed bug (same pattern as this whole session's bug-1471→1472→1474→1477 chain), not evidence the just-verified fix regressed something. Investigate the new failure on its own terms (what's different about THIS code path) rather than assuming causality from the just-changed code. + +## Key Learning (2026-07-29, bug-1479 FIXED — 3-layer fix, each layer only verifiable live) — a correct adapter-side fix can be unit-green and still be dead code in production; only a live re-run proves the wire is actually connected +bug-1479 (permanent quorum loss when a standby log-conflicts during chaotic election churn) needed THREE compounding fixes, and each of the first two looked complete after a clean unit-test run yet still failed the EXACT SAME live scenario (`run-ha-soak.sh --config-upgrade`'s `force_elect_node` loop) for a NEW reason each time: +1. **`ha_raft_on_repl_nack`** (primary-side): routes a WAL-ACK-reply NACK into the raft library's nextIndex backoff + immediate `repl_start_catchup`. Unit-correct, 1048/1048 green — but live soak v1 still failed identically (0/3 acked), because nothing ever produced the `success=0` reply this code was waiting for. +2. **Standby-side NACK sending** (`ha_apply_term_entry_via_library`'s logOk-reject path now calls `ha_send_wal_ack_reply_ex(..., success=0)` instead of silently dropping the reject — `ha_send_wal_ack_reply` had hardcoded `success=1` unconditionally, the ONLY WalAckReply sender in the whole controller). Unit-correct, verified via a new capture-hook test — but live soak v2 confirmed the NACK NOW reaches the primary (log-grepped: `WAL NACK from standby ... success=0`) and STILL failed identically, because `ha_stream_wal_to_standby`'s catch-up range was hard-capped at `committed_lsn`, which can never advance without this exact standby's own ack — a self-referential deadlock invisible from EITHER side's code in isolation. +3. **`ha_compute_repl_stream_ceiling_lsn`**: widens the STREAM_WAL ceiling (and the convergence check gating it) to the leader's own log tail, matching raft.tla's real AppendEntries semantics (leaderCommit is advisory, never a send-cap) — while re-using bug-1478's exact guard (never widen onto a trailing local-only checkpoint's unstreamable LSN) so fixing gap 3 didn't reopen gap-1478. Live soak v3: PASS, all 3 force-elect rounds, 1053/1053 unit tests. +**Do-not-repeat**: when an adapter/wire-protocol fix passes its own unit tests, that only proves the function is INTERNALLY correct — it does NOT prove anything upstream/downstream actually calls it with real data. For any fix whose job is "handle X when X arrives," always ALSO verify (via a live/integration run, log-grepped, not inferred) that X actually arrives in production BEFORE declaring victory — a unit-green "correct but unreachable" fix is functionally identical to no fix at all, and the only way to catch that is to re-run the EXACT scenario that surfaced the original bug, all the way to its real end state, every time a layer is added. + +## Key Learning (2026-07-29, raft-adapter-conformance task 5.1) — the bug-1479 fix commit (34ab78d7) already shipped a reply-construction-boundary regression test; the spec's "motivating finding" premise ("no test was ever written asserting the reply itself gets constructed") was not fully accurate +`test_config_repl.c`'s `test_bug1479_ae_reject_sends_nack_not_silence` (added IN the bug-1479 fix commit itself, before this spec existed) already asserts `ha_wal_ack_send_hook` fires with `success=0` on a WAL catch-up logOk reject — exactly the "reply itself gets constructed" boundary requirements.md's motivating finding claimed was untested. Confirmed by `git log -p -S` on the test name: it landed in 34ab78d7, not in this spec. Task 5.1's explicit `_Boundary:_` (`test_ha_core_safety.c`) still called for an independent copy built from that file's own `hcs4_*` fixture family, so it was added anyway (`test_5_1_wal_catchup_reject_sends_nack_reply`) — genuinely useful redundant coverage (a future change to the reject branch is now caught in two files' fixture families instead of one), just not closing a gap that was actually still open. **Do-not-repeat**: when a spec's "motivating finding" describes a coverage gap, grep for the exact assertion shape (here: the hook name `ha_wal_ack_send_hook` + `success=0`) across the WHOLE test suite before treating the gap as confirmed-empty — a fresh audit pass can miss a test that already exists in a sibling file, especially one added in the same commit as the fix it's paired with. Report the discrepancy as a CONCERN in the task's status report rather than silently either skipping the task or presenting it as if it closed a real gap. + +## Do-Not-Repeat (2026-07-30, admin-config-tool task 6.3) — a bare `re.search()` against a log with MULTIPLE occurrences of the same pattern silently matches the FIRST one, not the one you actually care about +Writing `test_e2e_live_ha_push.py`'s standby-ACK evidence check as `_STANDBY_SAVED_RE.search(standby.log_file.read_text())` looked correct and even matched a real, live `handle_repl_config_push` line — but a standby's log legitimately gets MULTIPLE `handle_repl_config_push` events over one test's lifetime (an automatic bootstrap sync of the primary's already-loaded config fires right after election, BEFORE the test's own `xceadmin config push`), so `search()`'s first match was always the OLDER bootstrap tag, never the specific push under test, and the assertion failed unconditionally regardless of whether the real ACK happened. Fixed with `re.finditer(...)` checked against ALL occurrences. **Do-not-repeat**: when asserting "this specific event happened" against a log a long-lived process keeps appending to, always consider whether the SAME log line shape can legitimately appear more than once for unrelated reasons before reaching for `re.search()` — default to `finditer`/`findall` + an explicit identity check (here: the exact tag) unless you've confirmed the pattern is provably unique in that log. + +## Key Learning (2026-07-30, admin-config-tool task 6.3) — design.md's own "Boundary Commitments"/"Revalidation Triggers" sections are the first place to check before writing a live test whose task text assumes a capability might not exist server-side +Task 6.3 asked for a live redirect-following test (`config push` to a standby → follows redirect to primary → succeeds). Live-verified against a real 3-node cluster: it does NOT redirect — `ha_dispatch_gate()` rejects a standby's `OP_upgradeConfig` with `E_XCE_STANDBY` (10014) BEFORE the opcode-specific handler runs, and `fill_redirect_reply()` (`join.c`) is only ever wired for `OPCode_join`, never `OPCode_upgradeConfig`. This was NOT a surprise requiring fresh investigation — `design.md`'s own "Out of Boundary" section already documented this exact gap verbatim ("Redirect wiring for `OP_upgradeConfig`... it will not fire for `config push` until the controller is extended"), and "Revalidation Triggers" already lists the fix as a future, not-yet-done item. **Do-not-repeat**: before writing ANY live/E2E test whose premise is "component X's capability Y works end-to-end," grep the spec's own design.md for "Boundary Commitments"/"Out of Boundary"/"Revalidation Triggers" sections FIRST — if the capability is already flagged there as not-yet-implemented, the test should be written to lock in the REAL current (rejection) behavior with a pointer to the trigger that will make it stale, not spend a debugging cycle rediscovering a documented gap from scratch via trial and error. + +## Do-Not-Repeat (2026-07-30, admin-config-tool task 6.3) — Bash tool calls that `pkill` a process this session itself backgrounded can report a misleading exit code (144) even when the command's actual effect (killing the process, running rm -rf) succeeded +Multiple `pkill -f xce_controller; sleep 1; ...` bash calls in this session reported exit code 144 (not a standard shell exit code — looks harness-level, not `$?`-derived) even though a follow-up `pgrep -af xce_controller` in the NEXT call confirmed the kill had actually taken effect. This only ever happened on calls that killed/interacted with background xce_controller processes this same session had spawned (via `subprocess.Popen`/pytest fixtures or manual `&`/`setsid nohup`), never on unrelated trivial commands. **Do-not-repeat**: don't treat a 144 exit code as proof a cleanup/pkill command failed — verify with an independent follow-up check (`pgrep`, `ls`) in a SEPARATE bash call before concluding anything is actually broken; retrying the exact same command (or just checking state) is usually enough, no special handling needed. + +## Do-Not-Repeat (2026-07-31, bug-1464 extended) — `xce-build.sh`'s unconditional `rm -rf $BUILD_DIR` races across MULTIPLE CONCURRENT AGENT SESSIONS on this same worktree, not just across sequential single-component invocations +Ran `/xce-build all` (backgrounded) in this session while at least two OTHER Claude sessions were, unbeknownst to this session at launch time, ALSO independently invoking `xce-build.sh` (`controller`-only, then a separate `all` run) against the exact same shared `src/xce.build` dir in `/home/rshen/projects/xce/worktrees/config` — visible via `ps auxf` as sibling `bash src/tools/xce-build.sh ...` processes under different parent `claude --output-format stream-json` PIDs. This session's own backgrounded `all` run got silently torn out mid-flight ([360/362], no error, no completion marker, log just stopped growing) — almost certainly because a peer's `xce-build.sh` invocation hit line ~59's unconditional `rm -rf "$BUILD_DIR"` (same bug-1464 root cause, `BUILD_DIR` defaults to `xce.build` regardless of which component(s) you pass) out from under the still-running ninja/meson process. **This is a strictly worse variant of bug-1464**: the original note was about ONE session sequencing single-component builds; this shows even two *concurrent* full `all` builds from *different* sessions collide the same way, because `xce-build.sh` has no lockfile/mutex around its clean-then-setup step — there is no cross-session coordination at all. **Do-not-repeat**: before trusting a backgrounded `xce-build.sh` run's own log as authoritative (silent, no error, log just stops growing), run `ps auxf | grep -E 'xce-build|meson|ninja|cc1'` to check for a SIBLING invocation targeting the same worktree/BUILD_DIR from a different session — if found, do not stack a third concurrent build on top; wait (bounded poll on the peer PID, not a passive "background notification" — see next entry) for it to fully exit, THEN run your own single clean blocking build and treat only that run's own output as ground truth for a report. If this recurs, the real fix belongs in `xce-build.sh` itself (e.g. `flock` around the `rm -rf`+`meson setup` step), not in caller-side workarounds. + +## Do-Not-Repeat (2026-07-31) — a Bash `run_in_background` task inside a background *subagent* invocation may never deliver its "you'll be notified when it completes" notification; don't wait passively on it +As a subagent (spawned via the `Agent` tool, running in the background from the parent's perspective), a `Bash` call with `run_in_background: true` did not visibly notify this session on completion even after several idle turns — a peer/coordinator message eventually had to point out "you're a subagent, you don't get woken up by background task notifications, check `ps aux` and wait blocking instead," which held up on inspection (the process really had died, torn out by the concurrent-build race in the entry above). **Do-not-repeat**: when running as a background subagent (not the top-level session), do NOT rely on Bash background-task completion notifications to resume work — either (a) run the long command in the foreground with a generous explicit `timeout` (up to 600000ms), or (b) if backgrounding is unavoidable (command may exceed 10 min), actively self-poll with a bounded `while kill -0 $PID; do sleep N; done` foreground Bash call rather than idling and waiting for a push notification that may never arrive in this execution context. + +## Key Learning (2026-07-31, bug-1487) — a "committed job loss" in `--chaotic` xce-test-ha soaks can be a false positive caused by the Raft own-term commit barrier, not real data loss — always check `verify_classify`'s timing before touching controller code +Root-caused a `committed_job_loss=1` chaotic-soak FAIL entirely from logs/timestamps, no code change to `src/controller/`. Mechanism: a newly-elected primary cannot fold a PRIOR-term entry into its own `committed_lsn` watermark just because it holds it durably (Raft Figure-8 safety; `ha_arm_own_term_gate` in `ha.c` — every promotion appends an own-term `WAL_NOOP` and only advances `committed_lsn` past the inherited prefix once THAT noop itself gets a fresh majority ack under the new term). `expect-job` reads `c->jobmgr`, populated only by the apply pump once entries cross `committed_lsn` — so a genuinely majority-committed job can be transiently invisible on the brand-new primary until that fresh ack lands. In steady state this closes in <200ms, but `--chaotic` mode's own "restart the previous round's downed node with no convergence wait" design means the peer whose ack is needed can itself be mid-catch-up, stretching the window to several seconds (measured live: 6.232s). `run-ha-soak.sh`'s chaotic-mode `verify_classify()` ran its `expect-job` check immediately on primary detection with zero settle/retry (unlike `verify_no_loss`, which already had a bug-1422 3-attempt/2s retry, and unlike `wait_for_full_convergence`, which chaotic mode deliberately skips between kills). Fix was a bounded retry in `verify_classify` alone (5×2s), never touching `src/controller/`. **Do-not-repeat**: before treating any xce-test-ha `committed_job_loss` count as a real controller bug, first check (a) whether the SAME job shows up as present in every LATER verify/final-sweep in the same run (a real loss never comes back; this class of false-positive always does), and (b) whether `verify_classify`/whichever check flagged it has an equivalent settle/retry to its sibling `verify_no_loss` — chaotic and sequential modes have historically drifted out of sync on this (bug-1422 fixed sequential only; bug-1487 caught chaotic's matching gap 3 weeks later). diff --git a/.wolf/hooks/_session.json b/.wolf/hooks/_session.json index 2e3941c..d40bb3d 100644 --- a/.wolf/hooks/_session.json +++ b/.wolf/hooks/_session.json @@ -1,428 +1,386 @@ { - "session_id": "session-2026-07-23-2018", - "started": "2026-07-23T03:18:13.693Z", + "session_id": "session-2026-07-30-0409", + "started": 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Hooks and AI append to this file automatically. + +| 04:09 | Created brief.md and requirements.md for scheduler-preemption spec, extracting Req 6 from scheduler-framework/requirements.md | .kiro/specs/scheduler-preemption/brief.md, .kiro/specs/scheduler-preemption/requirements.md | created both files successfully | ~3500 > Old sessions are consolidated by the daemon weekly. +| 21:32 | full ASAN rebuild (`xce-build.sh all asan`) to pick up bug-1474 fix (commit c0b0c7d) + produce xceadmin binary; hit bug-1439 ninja parallel-build race TWICE (1st: capnp.h missing for hook.c.o, 2nd: NEW variant -lxce missing for apiserver's Go/CGO link), 3rd invocation succeeded clean | src/xce.build/controller/{xce_controller,xce_test}, src/xce.build/xceadmin/.venv/bin/xceadmin, src/xce.build/frontend/{apiserver/xce_apiserver,xcecli/xcecli} | PASS: meson Ok:9 Fail:0, scheduler 15/15, apiserver+xcecli Go tests ok, xceadmin pytest 166 passed; bug-1474 WARN string confirmed present in binary | ~95k | +| 15:15 | config-upgrade-snapshot task 5: added `case WAL_CONFIG_MARKER` in apply_committed_entry() calling new persist_checkpoint_marker_triggered() (never locks apply_pump_lock -- fixes self-deadlock vs persist_apply_pump_run's already-held lock; takes explicit marker lsn param -- fixes stale-checkpoint_lsn since last_applied_lsn isn't advanced yet at that point); factored persist_checkpoint_write_locked() shared by both persist_checkpoint() and the new trigger; -EBUSY treated as expected/self-resolving (TRACE, no retry); 6 new tests in test_upgrade_snapshot_apply.c drive the REAL persist_apply_pump_run/persist_recover call sites (not bare apply_committed_entry calls) to actually exercise both hazards; found+fixed a real regression in test_config_repl.c (2 tests) caused by the new automatic checkpoint racing fsync_worker + a genuine pre-existing raft-log-index co-tracking gap (persist_write_checkpoint_marker bypasses raft_log_append, so config_append_marker's returned lsn under-counts once a checkpoint has interleaved -- logged as bug-1466, does not corrupt commit/durability since that's driven by persist_t durable_lsn not raft's s->log_len) | src/controller/persist.c, src/controller/testsuite/test_upgrade_snapshot_apply.c (new), src/controller/testsuite/test_config_repl.c, src/controller/meson.build, src/controller/testsuite/controller_test.c | 997 Tests 0 Failures 0 Ignored OK (3x stable full-suite runs) | ~180k | +| 10:02 | config-upgrade-snapshot task 2.2 sequencing: task 2.2 (queue admin-state capnp write side) implemented+correct, but load_snapshot's queue decode is still task 4's job -- added TEST_IGNORE_MESSAGE to test_snapent_load_snapshot_restores_entities_before_advancing_position (real checkpoint+load round trip, m_queues=2) citing bug-847's precedent; confirmed via git-diff-revert-rebuild it fails Expected 0 Was -22 without the ignore; confirmed no other test does a real non-empty-queue checkpoint+load round trip (test_snapverify.c hand-builds its own raw-layout files bypassing write_snapshot; test_config_repl.c's persist_checkpoint call is never followed by a load) | controller/testsuite/test_persist_snapshot_entities.c | 981 Tests 0 Failures 1 Ignored OK | ~55k | | 07:30 | /xce-test-ha sequential mode: 10 rounds, 36 jobs, zero loss, all 3 nodes led (ctrl-1/2/3 primary coverage). Chaotic mode: 4 rounds complete+verified, round 5 discovery lag (bug-854 excluded), rounds 6-10 stalled (election lag, duplicate-node guard bug-1418). Sequential PASS verdict, chaotic hit edge-case cascade in overlapping-kill window | .claude/skills/xce-test-ha/run-ha-soak.sh | SEQUENTIAL=PASS, CHAOTIC=STALLED@R7 | ~150 | +| 09:10 | config-upgrade-snapshot task 2.1: added collect_host_frames + capnp_encode_host_admin_state (mirrors collect_queue_frames, no retention predicate -- every live host gets one frame, status masked to PERSIST_WORKER_ADMIN_MASK); wired into write_snapshot after queue trailer; 6 new tests (RED confirmed via git-stash, then GREEN) | controller/persist.c, controller/testsuite/test_persist_snapshot_entities.c | 981 Tests 0 Failures 0 Ignored OK | ~45k | | 07:26 | job-array-single-wal-record task 3.2: added `case WAL_JOB_ARRAY_SUBMIT` to apply_committed_entry() calling restore_job_array(), firing HOOK_DETAIL_JOB_NEW exactly once with the N-element out_new_jobs list; 3 new tests in test_apply_committed_entry.c (constructs-all-fires-once, idempotent-replay-no-extra-notify, forced-failure-fires-no-hook); RED confirmed via git-revert-rebuild-rerun (3 predicted failures), GREEN restored; 51/51 pass across 8-group regression sweep, 945/945 pass full suite, exit 0, no ASAN/leak signatures | src/controller/persist.c, src/controller/testsuite/test_apply_committed_entry.c | GREEN, task 3.2 READY_FOR_REVIEW | ~9500 | | 18:25 | Task 6.1 round 2 (raft-apply-decoupling): fixed round-1's job-state corruption bug — FAIL/postdone facts no longer bake a receipt-time state snapshot into WAL; wal_jobstate_t._pad now carries WAL_JOB_FAIL_STAGE_FLAG\|stage or WAL_JOB_UPDATE_POSTDONE_MARK, and apply_committed_entry() re-derives the merge at apply time via apply_job_fail_transition/new apply_job_postdone_transition against ACTUAL current state; new persist_submit_job_fact_ex(pad) primitive; fixed 2 pre-existing test_commit_barrier_reply.c tests whose assertions read the now-changed wire format directly (updated to check _pad + call the guard cores directly, not touching the 2 EXPECTED apply-pump-ordering failures reserved for task 7.3); new RED-then-GREEN regression test_apply_pump_fail_racing_finish_merges_against_current_state proves DONE\|PERR not RUN\|EXIT\|PERR; full suite census 904 PASS / 2 expected FAIL, zero new regressions; observed a rare (~2%) unrelated timing flake in the shared (reviewer-verified, off-limits) apply-pump-kick mechanism, not reproducible as a logic defect | wal_types.h, persist.h, cluster.h, job.c, persist.c, test_apply_pump.c, test_commit_barrier_reply.c | GREEN (2 pre-existing expected FAILs unchanged) | ~2200 | | 08:35 | Tasks 2.1+2.2+2.3 (ha-wal-replication): repl_add_standby idempotency (scan for dup ep before alloc); register standbys in raft_cb_become_leader (election path, via votes[i].peer->hostname/port) and on_standby_connected (late-joiner); deregister in vote_ep_err_handler and standby_ep_err_handler_primary; TDD RED→GREEN; all controller tests PASS | ha.c, repl.c, test_repl_unit.c | GREEN | ~250 | @@ -6084,3 +6090,1178 @@ | 02:11 | Session end: 33 writes across 20 files (cluster.c, sched.c, limits.yaml, project_bug1462_config_replication_fixed.md, MEMORY.md) | 39 reads | ~71360 tok | | 12:10 | Updated root CLAUDE.md: corrected Native Adapter Go-import assumption (myxce kernel is C/cgo, Go only at apiserver/xcecli edges), logged API Key auth is half-built, confirmed 2 decisions (code location, service-account API Key auth) | /Users/dankeer/Projects/chatbot/CLAUDE.md | done | ~600 | | 12:10 | Updated myxce/CLAUDE.md and src/frontend/CLAUDE.md: registered planned schedulerclient/ and mcp-server/ modules (Phase 0, in progress) pointing to root CLAUDE.md for overall plan | myxce/CLAUDE.md, myxce/src/frontend/CLAUDE.md | done | ~300 | + +## Session: 2026-07-23 02:32 + +| Time | Action | File(s) | Outcome | ~Tokens | +|------|--------|---------|---------|--------| + +## Session: 2026-07-23 02:44 + +| Time | Action | File(s) | Outcome | ~Tokens | +|------|--------|---------|---------|--------| +| 03:02 | Edited .kiro/specs/config-upgrade-snapshot/spec.json | 22→20 lines | ~114 | +| 03:02 | Created ../../../../../claude/.claude/projects/-home-rshen-projects-xce-xce/memory/project_bug1418_prework_decision.md | — | ~670 | +| 03:03 | Edited ../../../../../claude/.claude/projects/-home-rshen-projects-xce-xce/memory/MEMORY.md | modified 1464() | ~317 | +| 03:03 | Created ../../../../../claude/.claude/projects/-home-rshen-projects-xce-xce/memory/reference_xce_build_shared_dir_clobber.md | — | ~412 | +| 09:56 | re-verified bug-1418 fixed via fresh 10-round chaotic soak; rebuilt controller+xceadmin together (bug-1464: single-component /xce-build wipes shared xce.build dir); cleared config-upgrade-snapshot blocked_on | src/tools/xce-build.sh, .kiro/specs/config-upgrade-snapshot/spec.json, .wolf/buglog.json | PASS (10 rounds, 33 jobs, 0 divergence, 0 loss) | ~35k | +| 03:04 | Edited .kiro/specs/config-upgrade-snapshot/requirements.md | inline fix | ~210 | +| 03:15 | Edited .kiro/specs/config-upgrade-snapshot/requirements.md | inline fix | ~27 | +| 03:15 | Edited .kiro/specs/config-upgrade-snapshot/requirements.md | inline fix | ~635 | +| 03:16 | Session end: 7 writes across 5 files (spec.json, project_bug1418_prework_decision.md, MEMORY.md, reference_xce_build_shared_dir_clobber.md, requirements.md) | 12 reads | ~120466 tok | +| 03:23 | Edited .kiro/specs/config-upgrade-snapshot/requirements.md | inline fix | ~128 | +| 03:23 | Edited .kiro/specs/config-upgrade-snapshot/requirements.md | 1→2 lines | ~995 | +| 03:23 | Session end: 9 writes across 5 files (spec.json, project_bug1418_prework_decision.md, MEMORY.md, reference_xce_build_shared_dir_clobber.md, requirements.md) | 13 reads | ~122062 tok | +| 03:27 | Session end: 9 writes across 5 files (spec.json, project_bug1418_prework_decision.md, MEMORY.md, reference_xce_build_shared_dir_clobber.md, requirements.md) | 13 reads | ~122062 tok | +| 03:28 | Edited .kiro/specs/config-upgrade-snapshot/requirements.md | 1→2 lines | ~230 | +| 03:29 | Edited .kiro/specs/config-upgrade-snapshot/requirements.md | 1→2 lines | ~132 | +| 03:29 | Edited .kiro/specs/config-upgrade-snapshot/requirements.md | 1→3 lines | ~292 | +| 03:29 | Edited .kiro/specs/config-upgrade-snapshot/requirements.md | 1→2 lines | ~150 | +| 03:29 | Session end: 13 writes across 5 files (spec.json, project_bug1418_prework_decision.md, MEMORY.md, reference_xce_build_shared_dir_clobber.md, requirements.md) | 13 reads | ~123345 tok | +| 03:37 | Session end: 13 writes across 5 files (spec.json, project_bug1418_prework_decision.md, MEMORY.md, reference_xce_build_shared_dir_clobber.md, requirements.md) | 13 reads | ~123345 tok | +| 03:39 | Session end: 13 writes across 5 files (spec.json, project_bug1418_prework_decision.md, MEMORY.md, reference_xce_build_shared_dir_clobber.md, requirements.md) | 13 reads | ~123345 tok | +| 03:44 | Edited .kiro/specs/config-upgrade-snapshot/requirements.md | inline fix | ~400 | +| 03:44 | Edited .kiro/specs/config-upgrade-snapshot/requirements.md | 1→2 lines | ~225 | +| 03:44 | Edited .kiro/specs/config-upgrade-snapshot/requirements.md | 1→2 lines | ~179 | +| 03:45 | Edited .kiro/specs/config-upgrade-snapshot/requirements.md | 1→2 lines | ~244 | +| 03:45 | Session end: 17 writes across 5 files (spec.json, project_bug1418_prework_decision.md, MEMORY.md, reference_xce_build_shared_dir_clobber.md, requirements.md) | 15 reads | ~160361 tok | +| 03:49 | Edited .kiro/specs/config-upgrade-snapshot/requirements.md | 1→2 lines | ~382 | +| 03:49 | Edited .kiro/specs/config-upgrade-snapshot/requirements.md | modified path() | ~1075 | +| 03:49 | Session end: 19 writes across 5 files (spec.json, project_bug1418_prework_decision.md, MEMORY.md, reference_xce_build_shared_dir_clobber.md, requirements.md) | 16 reads | ~162356 tok | +| 03:58 | Edited .kiro/specs/config-upgrade-snapshot/requirements.md | expanded (+9 lines) | ~448 | +| 03:58 | Session end: 20 writes across 5 files (spec.json, project_bug1418_prework_decision.md, MEMORY.md, reference_xce_build_shared_dir_clobber.md, requirements.md) | 16 reads | ~163643 tok | +| 06:06 | Session end: 20 writes across 5 files (spec.json, project_bug1418_prework_decision.md, MEMORY.md, reference_xce_build_shared_dir_clobber.md, requirements.md) | 16 reads | ~163643 tok | +| 06:08 | Edited .kiro/specs/config-upgrade-snapshot/spec.json | 8→8 lines | ~55 | +| 06:30 | Edited .kiro/specs/config-upgrade-snapshot/research.md | added error handling | ~4399 | +| 06:35 | Created .kiro/specs/config-upgrade-snapshot/design.md | — | ~11844 | +| 06:37 | Edited .kiro/specs/config-upgrade-snapshot/design.md | inline fix | ~25 | +| 06:38 | Edited .kiro/specs/config-upgrade-snapshot/design.md | inline fix | ~35 | +| 06:38 | Edited .kiro/specs/config-upgrade-snapshot/design.md | inline fix | ~19 | +| 06:40 | Edited .kiro/specs/config-upgrade-snapshot/spec.json | 12→12 lines | ~74 | +| 11:35 | generated design.md for config-upgrade-snapshot via kiro-spec-design -y; light discovery across persist.c/ha.c/config_repl.c/worker.c confirmed apply_committed_entry is the single unified apply seam (apply_wal_entry dead, zero callers), config_serve_fence is a direct precedent for the new activation fence, persist_checkpoint is already force-callable | .kiro/specs/config-upgrade-snapshot/{design.md,research.md,spec.json} | design review gate passed (1 repair pass, bare-ID style), phase=design-generated | ~180k | +| 06:40 | Session end: 27 writes across 7 files (spec.json, project_bug1418_prework_decision.md, MEMORY.md, reference_xce_build_shared_dir_clobber.md, requirements.md) | 47 reads | ~526415 tok | +| 06:50 | Session end: 27 writes across 7 files (spec.json, project_bug1418_prework_decision.md, MEMORY.md, reference_xce_build_shared_dir_clobber.md, requirements.md) | 52 reads | ~532133 tok | +| 06:53 | Edited .kiro/specs/config-upgrade-snapshot/design.md | inline fix | ~109 | +| 06:53 | Edited .kiro/specs/config-upgrade-snapshot/design.md | inline fix | ~276 | +| 06:53 | Edited .kiro/specs/config-upgrade-snapshot/design.md | 1→2 lines | ~350 | +| 06:54 | Edited .kiro/specs/config-upgrade-snapshot/design.md | "config_repl.c" → "write_snapshot" | ~137 | +| 06:55 | Edited .kiro/specs/config-upgrade-snapshot/design.md | accessor() → fields() | ~73 | +| 06:55 | Edited .kiro/specs/config-upgrade-snapshot/design.md | inline fix | ~263 | +| 06:58 | Edited .kiro/specs/config-upgrade-snapshot/design.md | added error handling | ~380 | +| 07:00 | Edited .kiro/specs/config-upgrade-snapshot/design.md | inline fix | ~33 | +| 07:01 | Edited .kiro/specs/config-upgrade-snapshot/design.md | inline fix | ~71 | +| 07:01 | Session end: 36 writes across 7 files (spec.json, project_bug1418_prework_decision.md, MEMORY.md, reference_xce_build_shared_dir_clobber.md, requirements.md) | 53 reads | ~545850 tok | +| 19:52 | Session end: 36 writes across 7 files (spec.json, project_bug1418_prework_decision.md, MEMORY.md, reference_xce_build_shared_dir_clobber.md, requirements.md) | 53 reads | ~545850 tok | +| 19:58 | Edited .kiro/specs/config-upgrade-snapshot/requirements.md | 1→2 lines | ~223 | +| 19:59 | Edited .kiro/specs/config-upgrade-snapshot/design.md | 1→2 lines | ~97 | +| 20:00 | Edited .kiro/specs/config-upgrade-snapshot/design.md | 1→2 lines | ~501 | +| 20:00 | Edited .kiro/specs/config-upgrade-snapshot/design.md | inline fix | ~146 | +| 20:00 | Session end: 40 writes across 7 files (spec.json, project_bug1418_prework_decision.md, MEMORY.md, reference_xce_build_shared_dir_clobber.md, requirements.md) | 53 reads | ~547236 tok | +| 20:03 | Edited .kiro/specs/config-upgrade-snapshot/requirements.md | 3→3 lines | ~131 | +| 20:04 | Edited .kiro/specs/config-upgrade-snapshot/design.md | inline fix | ~59 | +| 20:05 | Edited .kiro/specs/config-upgrade-snapshot/design.md | 4→4 lines | ~33 | +| 20:05 | Edited .kiro/specs/config-upgrade-snapshot/design.md | inline fix | ~43 | +| 20:06 | Session end: 44 writes across 7 files (spec.json, project_bug1418_prework_decision.md, MEMORY.md, reference_xce_build_shared_dir_clobber.md, requirements.md) | 53 reads | ~548060 tok | +| 20:13 | Created .kiro/specs/config-upgrade-snapshot/tasks.md | — | ~3830 | +| 20:14 | Edited .kiro/specs/config-upgrade-snapshot/tasks.md | 4→5 lines | ~45 | +| 20:16 | Edited .kiro/specs/config-upgrade-snapshot/tasks.md | 4→5 lines | ~64 | +| 20:17 | Edited .kiro/specs/config-upgrade-snapshot/tasks.md | 4→5 lines | ~37 | +| 20:17 | Edited .kiro/specs/config-upgrade-snapshot/tasks.md | 4→5 lines | ~62 | +| 20:28 | Created .kiro/specs/config-upgrade-snapshot/tasks.md | — | ~4238 | +| 20:37 | Edited .kiro/specs/config-upgrade-snapshot/tasks.md | 2→2 lines | ~47 | +| 20:39 | Edited .kiro/specs/config-upgrade-snapshot/spec.json | 20→20 lines | ~110 | +| 20:40 | Session end: 52 writes across 8 files (spec.json, project_bug1418_prework_decision.md, MEMORY.md, reference_xce_build_shared_dir_clobber.md, requirements.md) | 57 reads | ~564805 tok | +| 20:44 | Session end: 52 writes across 8 files (spec.json, project_bug1418_prework_decision.md, MEMORY.md, reference_xce_build_shared_dir_clobber.md, requirements.md) | 60 reads | ~568628 tok | +| 20:48 | Session end: 52 writes across 8 files (spec.json, project_bug1418_prework_decision.md, MEMORY.md, reference_xce_build_shared_dir_clobber.md, requirements.md) | 60 reads | ~568628 tok | + +## Session: 2026-07-24 21:46 + +| Time | Action | File(s) | Outcome | ~Tokens | +|------|--------|---------|---------|--------| +| 22:16 | Edited src/schema/controller.capnp | modified QueueConf() | ~354 | +| 22:16 | Edited src/include/typemap.h | modified struct() | ~302 | +| 22:16 | Edited src/controller/persist.c | modified 1() | ~279 | +| 22:17 | Edited src/controller/testsuite/test_config_repl.c | modified filler() | ~354 | +| 22:17 | Edited src/controller/testsuite/test_config_repl.c | 15→16 lines | ~279 | +| 22:18 | Edited src/controller/testsuite/test_config_repl.c | modified checkpoint() | ~299 | +| 22:19 | Edited src/controller/testsuite/test_config_repl.c | modified 1() | ~1190 | +| 22:20 | Edited src/controller/testsuite/test_config_repl.c | 3→6 lines | ~109 | +| 22:21 | Edited src/controller/persist.c | inline fix | ~28 | +| 05:29 | xce-build.sh controller: env broken, nix hash mismatch (capnpc-1.0.1 source.drv) recurrence of bug-918, deterministic on retry, no compile reached | .wolf/buglog.json, src/flake.lock | env-blocked, no test results captured | ~300 | +| 22:48 | Edited src/controller/persist.c | inline fix | ~10 | +| 22:53 | config-upgrade-snapshot task 1 complete: HostAdminState/QueueAdminState capnp structs (mapname'd onto new typemap.h C counterparts, matching capnp_snap_hdr_t precedent), SNAPSHOT_FORMAT_VERSION 1->2, 3 test fixtures updated to fake_fmt=2u, new test_snapshot_recv_old_format_version_rejected_fail_loud (fmt=1u rejected fail-loud) | src/schema/controller.capnp, src/include/typemap.h, src/controller/persist.c, src/controller/testsuite/test_config_repl.c | schema verified via direct capnp/capnpc-c binaries from cached /nix/store (bug-918 recurrence-3 blocked full nix develop/build+link+test; confirmed identical failure in canonical non-worktree repo, not worktree-specific; librtti never built on this machine at all so full link is separately infeasible) | ~9500 | +| 23:42 | Edited src/nixSupport/xce.nix | expanded (+11 lines) | ~175 | +| 23:56 | Session end: 11 writes across 5 files (controller.capnp, typemap.h, persist.c, test_config_repl.c, xce.nix) | 20 reads | ~296043 tok | +| 00:18 | Session end: 11 writes across 5 files (controller.capnp, typemap.h, persist.c, test_config_repl.c, xce.nix) | 20 reads | ~296043 tok | +| 00:46 | Session end: 11 writes across 5 files (controller.capnp, typemap.h, persist.c, test_config_repl.c, xce.nix) | 20 reads | ~296043 tok | +| 00:49 | Session end: 11 writes across 5 files (controller.capnp, typemap.h, persist.c, test_config_repl.c, xce.nix) | 20 reads | ~296043 tok | +| 00:59 | Edited src/controller/testsuite/test_persist_snapshot_entities.c | 1→2 lines | ~48 | +| 01:10 | config-upgrade-snapshot task 1 validated: nix build fixed (bug-918 capnpc pin) unblocked full controller_unit_test run; 3 pre-existing FAILs in test_persist_snapshot_entities.c root-caused to stale SNAPENT_TEST_FORMAT_VERSION=1u, fixed to 2u; full suite 978 Tests 0 Failures 0 Ignored OK | controller/persist.c, controller/testsuite/{test_config_repl,test_persist_snapshot_entities}.c, include/typemap.h, schema/controller.capnp, nixSupport/xce.nix | READY_FOR_REVIEW | ~0 | +| 01:20 | Edited src/controller/testsuite/test_persist_snapshot_entities.c | 2→2 lines | ~47 | +| 01:24 | Edited .kiro/specs/config-upgrade-snapshot/tasks.md | inline fix | ~29 | +| 01:25 | Edited .kiro/specs/config-upgrade-snapshot/tasks.md | modified environment() | ~557 | +| 01:27 | Created ../../../../../claude/.claude/projects/-home-rshen-projects-xce-xce/memory/reference_nix_capnpc_pin_fix.md | — | ~486 | +| 01:27 | Edited ../../../../../claude/.claude/projects/-home-rshen-projects-xce-xce/memory/MEMORY.md | 3→4 lines | ~79 | +| 01:45 | Edited src/controller/persist.c | added 1 condition(s) | ~316 | +| 01:45 | Edited src/controller/persist.c | added 9 condition(s) | ~1290 | +| 01:46 | Edited src/controller/persist.c | snap_job_frame_t() → snap_host_frame_t() | ~162 | +| 01:46 | Edited src/controller/persist.c | modified if() | ~115 | +| 01:47 | Edited src/controller/persist.c | added 1 condition(s) | ~165 | +| 01:47 | Edited src/controller/persist.c | added 4 condition(s) | ~341 | +| 01:49 | Edited src/controller/testsuite/test_persist_snapshot_entities.c | 7→8 lines | ~48 | +| 01:49 | Edited src/controller/testsuite/test_persist_snapshot_entities.c | modified snapent_queue_status() | ~402 | +| 01:49 | Edited src/controller/testsuite/test_persist_snapshot_entities.c | modified snapent_seed_hosts() | ~359 | +| 01:51 | Edited src/controller/testsuite/test_persist_snapshot_entities.c | modified snapent_make() | ~525 | +| 01:52 | Edited src/controller/testsuite/test_persist_snapshot_entities.c | added 1 condition(s) | ~61 | +| 01:54 | Edited src/controller/testsuite/test_persist_snapshot_entities.c | added 20 condition(s) | ~3372 | +| 01:54 | Edited src/controller/testsuite/test_persist_snapshot_entities.c | 2→5 lines | ~96 | +| 02:16 | Edited .kiro/specs/config-upgrade-snapshot/tasks.md | inline fix | ~17 | +| 02:16 | Edited .kiro/specs/config-upgrade-snapshot/tasks.md | modified 3() | ~168 | +| 02:38 | Edited src/controller/testsuite/test_persist_snapshot_entities.c | 15→18 lines | ~358 | +| 02:39 | Edited src/controller/testsuite/test_persist_snapshot_entities.c | modified section() | ~570 | +| 02:39 | Edited src/controller/testsuite/test_persist_snapshot_entities.c | modified for() | ~306 | +| 02:41 | Edited src/controller/persist.c | added 1 condition(s) | ~386 | +| 02:42 | Edited src/controller/persist.c | modified struct() | ~540 | +| 02:42 | Edited src/controller/persist.c | strdup() → capnp_encode_queue_admin_state() | ~207 | +| 02:43 | Edited src/controller/persist.c | modified trailer() | ~251 | +| 02:52 | Edited src/controller/testsuite/test_persist_snapshot_entities.c | modified test_snapent_load_snapshot_restores_entities_before_advancing_position() | ~310 | +| 02:58 | Edited src/controller/testsuite/test_persist_snapshot_entities.c | removed 17 lines | ~8 | +| 03:19 | Edited .kiro/specs/config-upgrade-snapshot/tasks.md | inline fix | ~18 | +| 03:20 | Edited .kiro/specs/config-upgrade-snapshot/tasks.md | 1→4 lines | ~220 | +| 03:44 | Edited src/controller/persist.c | added 15 condition(s) | ~1756 | +| 03:44 | Edited src/controller/persist.c | added 6 condition(s) | ~854 | +| 03:45 | Edited src/controller/testsuite/test_persist_snapshot_entities.c | 23→26 lines | ~138 | +| 03:45 | Edited src/controller/testsuite/test_persist_snapshot_entities.c | modified struct() | ~107 | +| 03:46 | Edited src/controller/testsuite/test_persist_snapshot_entities.c | modified cluster() | ~519 | +| 03:47 | Edited src/controller/testsuite/test_persist_snapshot_entities.c | added 13 condition(s) | ~955 | +| 03:49 | Edited src/controller/testsuite/test_persist_snapshot_entities.c | modified of() | ~2030 | +| 03:51 | Edited src/controller/testsuite/test_persist_snapshot_entities.c | 2→5 lines | ~107 | +| 03:58 | Edited src/controller/testsuite/test_persist_snapshot_entities.c | modified of() | ~778 | +| 11:02 | Task 2.3 (config-upgrade-snapshot): added read_active_config_bytes + config-bytes checkpoint section, inline-duplicated (no config_repl.c call) per design.md precedent | src/controller/persist.c, src/controller/testsuite/test_persist_snapshot_entities.c | full suite 984 Tests 0 Failures 1 Ignored OK | ~9500 | +| 04:55 | Edited .kiro/specs/config-upgrade-snapshot/tasks.md | inline fix | ~19 | +| 04:55 | Edited .kiro/specs/config-upgrade-snapshot/tasks.md | modified needs() | ~134 | +| 05:11 | Edited src/controller/include/worker.h | 3→4 lines | ~78 | +| 05:15 | Created src/controller/testsuite/test_upgrade_snapshot_restore.c | — | ~3581 | +| 05:16 | Edited src/controller/testsuite/controller_test.c | modified setUp() | ~34 | +| 05:16 | Edited src/controller/testsuite/controller_test.c | 3→4 lines | ~28 | +| 05:16 | Edited src/controller/meson.build | 1→2 lines | ~25 | +| 05:17 | Edited src/controller/worker.c | added 5 condition(s) | ~1136 | +| 05:44 | Edited src/controller/worker.c | modified gap() | ~321 | +| 05:47 | Edited .kiro/specs/config-upgrade-snapshot/tasks.md | inline fix | ~30 | +| 05:48 | Edited .kiro/specs/config-upgrade-snapshot/tasks.md | 1→3 lines | ~180 | +| 06:07 | Edited src/controller/persist.c | 2→7 lines | ~119 | +| 06:08 | Edited src/controller/persist.c | added 6 condition(s) | ~2307 | +| 06:08 | Edited src/controller/persist.c | modified returns() | ~439 | +| 06:11 | Edited src/controller/testsuite/test_persist_snapshot_entities.c | modified test_snapent_load_snapshot_restores_entities_before_advancing_position() | ~135 | +| 06:11 | Edited src/controller/testsuite/test_persist_snapshot_entities.c | modified snapent_find_queue() | ~195 | +| 06:13 | Edited src/controller/testsuite/test_persist_snapshot_entities.c | modified Test() | ~2256 | +| 06:14 | Edited src/controller/testsuite/test_persist_snapshot_entities.c | expanded (+9 lines) | ~171 | +| 06:16 | Edited src/controller/testsuite/test_persist_snapshot_entities.c | inline fix | ~16 | +| 06:16 | Edited src/controller/testsuite/test_persist_snapshot_entities.c | 2→3 lines | ~67 | +| 06:31 | Edited src/controller/testsuite/test_config_repl.c | modified checkpoint() | ~469 | +| 06:33 | Edited src/controller/testsuite/test_config_repl.c | 8→9 lines | ~120 | +| 07:07 | Edited .kiro/specs/config-upgrade-snapshot/tasks.md | inline fix | ~19 | +| 07:07 | Edited .kiro/specs/config-upgrade-snapshot/tasks.md | inline fix | ~63 | +| 07:33 | Edited src/controller/persist.c | added 3 condition(s) | ~2030 | +| 07:36 | Edited src/controller/persist.c | added 2 condition(s) | ~1172 | +| 07:47 | Created src/controller/testsuite/test_upgrade_snapshot_apply.c | — | ~5535 | +| 07:50 | Edited src/controller/testsuite/test_upgrade_snapshot_apply.c | 4→8 lines | ~100 | +| 07:50 | Edited src/controller/meson.build | 1→2 lines | ~25 | +| 07:51 | Edited src/controller/testsuite/controller_test.c | 1→2 lines | ~26 | +| 07:51 | Edited src/controller/testsuite/controller_test.c | 1→2 lines | ~22 | +| 07:58 | Created src/controller/testsuite/test_upgrade_snapshot_apply.c | — | ~6646 | +| 08:12 | Edited src/controller/testsuite/test_config_repl.c | added 1 condition(s) | ~516 | +| 08:13 | Edited src/controller/testsuite/test_config_repl.c | modified t43_commit_marker() | ~232 | +| 08:15 | Edited src/controller/testsuite/test_config_repl.c | expanded (+8 lines) | ~209 | +| 08:17 | Edited src/controller/testsuite/test_config_repl.c | expanded (+6 lines) | ~163 | +| 08:19 | Edited src/controller/testsuite/test_config_repl.c | expanded (+13 lines) | ~426 | +| 08:32 | Edited src/controller/testsuite/test_config_repl.c | modified t43_append_marker_uncommitted() | ~507 | +| 08:33 | Edited src/controller/testsuite/test_config_repl.c | reduced (-13 lines) | ~104 | +| 08:34 | Edited src/controller/testsuite/test_config_repl.c | reduced (-6 lines) | ~32 | +| 09:27 | Edited .kiro/specs/config-upgrade-snapshot/tasks.md | inline fix | ~24 | +| 09:28 | Edited .kiro/specs/config-upgrade-snapshot/tasks.md | modified finding() | ~526 | +| 09:52 | Edited src/controller/ha.h | expanded (+38 lines) | ~833 | +| 09:52 | Edited src/controller/ha.h | modified upgrade_materialization_verify() | ~547 | +| 09:52 | Edited src/controller/ha.c | 2→3 lines | ~20 | +| 09:53 | Edited src/controller/ha.c | added 9 condition(s) | ~2592 | +| 19:39 | Edited src/controller/testsuite/test_config_repl.c | modified test_upgrade_materialization_verify_no_marker_clears_fence() | ~2975 | +| 19:40 | Edited src/controller/testsuite/test_config_repl.c | 2→7 lines | ~146 | +| 19:43 | Session end: 100 writes across 17 files (controller.capnp, typemap.h, persist.c, test_config_repl.c, xce.nix) | 48 reads | ~635552 tok | +| 19:46 | Edited src/controller/testsuite/test_config_repl.c | 6→11 lines | ~159 | +| 19:47 | Edited src/controller/testsuite/test_config_repl.c | 5→8 lines | ~96 | +| 19:50 | Edited .kiro/specs/config-upgrade-snapshot/tasks.md | inline fix | ~31 | +| 19:51 | Edited .kiro/specs/config-upgrade-snapshot/tasks.md | 1→3 lines | ~210 | +| 20:15 | Edited src/controller/ha.h | modified schedule_upgrade_materialization_retry() | ~308 | +| 20:15 | Edited src/controller/ha.c | added 11 condition(s) | ~1450 | +| 20:16 | Edited src/controller/ha.c | added 1 condition(s) | ~672 | +| 20:16 | Edited src/controller/ha.c | added 1 condition(s) | ~638 | +| 20:16 | Edited src/controller/ha.c | added 1 condition(s) | ~263 | +| 20:23 | Edited src/controller/ha.h | modified upgrade_materialization_retry_fn() | ~230 | +| 20:25 | Edited src/controller/testsuite/test_config_repl.c | modified test_upgrade_materialization_fence_enforced_by_dispatch_gate_and_promotion() | ~4128 | +| 20:26 | Edited src/controller/testsuite/test_config_repl.c | modified XCE_TESTING() | ~202 | +| 21:12 | Edited src/controller/persist.c | modified and() | ~321 | +| 21:12 | Edited src/controller/persist.c | modified and() | ~1068 | +| 21:13 | Edited src/controller/myapp.c | added 1 condition(s) | ~790 | +| 21:18 | Edited src/controller/testsuite/test_config_repl.c | modified test_wal_config_marker_apply_sets_fence_via_real_checkpoint_miss() | ~1902 | +| 21:19 | Edited src/controller/testsuite/test_config_repl.c | modified XCE_TESTING() | ~109 | +| 21:29 | Edited src/controller/testsuite/test_config_repl.c | expanded (+23 lines) | ~537 | +| 21:56 | Edited .kiro/specs/config-upgrade-snapshot/tasks.md | inline fix | ~19 | +| 21:57 | Edited .kiro/specs/config-upgrade-snapshot/tasks.md | modified rejection() | ~263 | +| 22:09 | Edited src/controller/config_repl.c | modified XCE_TESTING() | ~538 | +| 22:10 | Edited src/controller/config_repl.c | modified XCE_TESTING() | ~283 | +| 22:12 | Edited src/controller/testsuite/test_commit_barrier_rollout.c | modified XCE_TESTING() | ~1796 | +| 22:14 | Edited src/controller/testsuite/test_commit_barrier_rollout.c | 2→3 lines | ~59 | +| 22:37 | Edited .kiro/specs/config-upgrade-snapshot/tasks.md | inline fix | ~30 | +| 22:54 | Edited src/controller/persist.c | modified XCE_TESTING() | ~510 | +| 22:55 | Edited src/controller/persist.c | added 1 condition(s) | ~189 | +| 23:00 | Edited src/controller/testsuite/test_upgrade_snapshot_apply.c | added error handling | ~172 | +| 23:00 | Edited src/controller/testsuite/test_upgrade_snapshot_apply.c | added error handling | ~349 | +| 23:01 | Edited src/controller/testsuite/test_upgrade_snapshot_apply.c | added error handling | ~2563 | +| 23:02 | Edited src/controller/testsuite/test_upgrade_snapshot_apply.c | 2→4 lines | ~64 | +| 23:07 | Edited src/controller/testsuite/test_upgrade_snapshot_apply.c | 4→6 lines | ~103 | +| 23:09 | Edited src/controller/testsuite/test_upgrade_snapshot_apply.c | 6→4 lines | ~61 | +| 23:32 | Edited .kiro/specs/config-upgrade-snapshot/tasks.md | inline fix | ~24 | +| 23:52 | Edited .kiro/specs/config-upgrade-snapshot/tasks.md | inline fix | ~20 | +| 23:53 | Edited .kiro/specs/config-upgrade-snapshot/tasks.md | 1→3 lines | ~224 | +| 00:25 | Edited .kiro/specs/config-upgrade-snapshot/tasks.md | inline fix | ~12 | +| 00:26 | Edited .kiro/specs/config-upgrade-snapshot/tasks.md | 1→3 lines | ~183 | + +## Session: 2026-07-25 00:30 + +| Time | Action | File(s) | Outcome | ~Tokens | +|------|--------|---------|---------|--------| +| 00:56 | Created src/controller/testsuite/configcompare.h | — | ~1107 | +| 00:57 | Created src/controller/testsuite/test_configcompare.c | — | ~2076 | +| 00:57 | Edited src/controller/meson.build | inline fix | ~44 | +| 00:57 | Edited src/controller/meson.build | 11→12 lines | ~80 | +| 00:57 | Edited src/controller/meson.build | 5→8 lines | ~135 | +| 00:58 | Edited src/controller/meson.build | 4→6 lines | ~50 | +| 00:58 | Edited src/controller/testsuite/controller_test.c | 2→3 lines | ~28 | +| 00:58 | Edited src/controller/testsuite/controller_test.c | 2→3 lines | ~22 | +| 01:02 | Created src/controller/testsuite/configcompare.c | — | ~2122 | +| 01:06 | Session end: 9 writes across 5 files (configcompare.h, test_configcompare.c, meson.build, controller_test.c, configcompare.c) | 11 reads | ~200437 tok | +| 01:07 | Edited src/controller/testsuite/snapverify.h | modified struct() | ~769 | +| 01:08 | Edited src/controller/testsuite/snapverify.h | expanded (+6 lines) | ~283 | +| 01:08 | Edited src/controller/testsuite/snapverify.c | 4→8 lines | ~148 | +| 01:09 | Edited src/controller/testsuite/snapverify.c | added 1 condition(s) | ~154 | +| 01:10 | Edited src/controller/testsuite/snapverify.c | added 20 condition(s) | ~1878 | +| 01:11 | Edited src/controller/testsuite/snapverify.c | 10→13 lines | ~148 | +| 01:14 | Created src/controller/testsuite/test_snapverify.c | — | ~4696 | +| 01:24 | Session end: 16 writes across 8 files (configcompare.h, test_configcompare.c, meson.build, controller_test.c, configcompare.c) | 11 reads | ~211107 tok | +| 01:45 | Session end: 16 writes across 8 files (configcompare.h, test_configcompare.c, meson.build, controller_test.c, configcompare.c) | 15 reads | ~231413 tok | +| 01:48 | Session end: 16 writes across 8 files (configcompare.h, test_configcompare.c, meson.build, controller_test.c, configcompare.c) | 15 reads | ~231413 tok | +| 01:49 | Edited src/controller/testsuite/test.c | 2→3 lines | ~72 | +| 01:49 | Edited src/controller/testsuite/test.c | 3→4 lines | ~44 | +| 01:49 | Edited src/controller/testsuite/test.c | 4→5 lines | ~101 | +| 01:50 | Edited src/controller/testsuite/test.c | 4→5 lines | ~104 | +| 01:50 | Edited src/controller/testsuite/test.c | added 1 condition(s) | ~299 | +| 08:55 | Registered configcompare as xce_test CLI subcommand (reviewer fix, task 8.4) | src/controller/testsuite/test.c | 1022/1022 tests pass; help lists configcompare; IDENTICAL/DIVERGENT smoke-tested via piped stdin, exit 0/1 | ~1800 | +| 01:57 | Session end: 21 writes across 9 files (configcompare.h, test_configcompare.c, meson.build, controller_test.c, configcompare.c) | 16 reads | ~262456 tok | +| 02:04 | Edited .kiro/specs/config-upgrade-snapshot/tasks.md | inline fix | ~30 | +| 02:05 | Edited .kiro/specs/config-upgrade-snapshot/tasks.md | modified with() | ~395 | +| 02:20 | Session end: 23 writes across 10 files (configcompare.h, test_configcompare.c, meson.build, controller_test.c, configcompare.c) | 17 reads | ~269881 tok | +| 02:52 | Session end: 23 writes across 10 files (configcompare.h, test_configcompare.c, meson.build, controller_test.c, configcompare.c) | 23 reads | ~279545 tok | +| 03:14 | Created src/controller/testsuite/test_bug857_regression.c | — | ~6090 | +| 03:15 | Edited src/controller/meson.build | 2→3 lines | ~35 | +| 03:16 | Edited src/controller/testsuite/controller_test.c | modified setUp() | ~45 | +| 03:16 | Edited src/controller/testsuite/controller_test.c | 4→5 lines | ~37 | +| 03:17 | Edited .kiro/specs/config-upgrade-snapshot/design.md | inline fix | ~46 | +| 03:18 | Edited .kiro/specs/config-upgrade-snapshot/design.md | modified XCE_TESTING() | ~823 | +| 03:23 | Session end: 29 writes across 12 files (configcompare.h, test_configcompare.c, meson.build, controller_test.c, configcompare.c) | 24 reads | ~289399 tok | +| 03:25 | Session end: 29 writes across 12 files (configcompare.h, test_configcompare.c, meson.build, controller_test.c, configcompare.c) | 25 reads | ~295489 tok | +| 03:39 | Edited .kiro/specs/config-upgrade-snapshot/design.md | 2→2 lines | ~251 | +| 03:41 | Edited .kiro/specs/config-upgrade-snapshot/tasks.md | inline fix | ~23 | +| 03:42 | Edited .kiro/specs/config-upgrade-snapshot/tasks.md | modified XCE_TESTING() | ~845 | +| 04:01 | Session end: 32 writes across 12 files (configcompare.h, test_configcompare.c, meson.build, controller_test.c, configcompare.c) | 32 reads | ~362257 tok | +| 04:28 | Edited src/controller/cluster.c | modified fix() | ~544 | +| 04:30 | Edited src/lib/request.c | added 4 condition(s) | ~836 | +| 04:32 | Session end: 34 writes across 14 files (configcompare.h, test_configcompare.c, meson.build, controller_test.c, configcompare.c) | 34 reads | ~384133 tok | +| 04:32 | Edited src/include/request.h | expanded (+13 lines) | ~304 | +| 04:32 | Edited src/include/xceapi.h | expanded (+11 lines) | ~248 | +| 04:33 | Edited src/lib/xceapi.c | added 4 condition(s) | ~256 | +| 04:33 | Edited src/include/client.h | expanded (+8 lines) | ~192 | +| 04:36 | Edited src/lib/client.c | added 1 condition(s) | ~262 | +| 04:41 | Session end: 39 writes across 19 files (configcompare.h, test_configcompare.c, meson.build, controller_test.c, configcompare.c) | 36 reads | ~387384 tok | +| 04:41 | Edited src/controller/testsuite/test.c | 1→3 lines | ~32 | +| 04:42 | Edited src/controller/testsuite/test.c | 2→3 lines | ~35 | +| 04:42 | Edited src/controller/testsuite/test.c | 2→5 lines | ~87 | +| 04:43 | Edited src/controller/testsuite/test.c | added 10 condition(s) | ~1079 | +| 04:59 | Edited src/controller/testsuite/test.c | added 1 condition(s) | ~184 | +| 05:00 | Session end: 44 writes across 19 files (configcompare.h, test_configcompare.c, meson.build, controller_test.c, configcompare.c) | 38 reads | ~388902 tok | +| 05:03 | Session end: 44 writes across 19 files (configcompare.h, test_configcompare.c, meson.build, controller_test.c, configcompare.c) | 38 reads | ~389017 tok | +| 05:15 | Edited .claude/skills/xce-test-ha/run-ha-soak.sh | modified find_xceadmin() | ~3566 | +| 05:16 | Edited .claude/skills/xce-test-ha/run-ha-soak.sh | 2→3 lines | ~48 | +| 05:17 | Edited .claude/skills/xce-test-ha/run-ha-soak.sh | modified 6() | ~423 | +| 05:18 | Edited .claude/skills/xce-test-ha/run-ha-soak.sh | expanded (+8 lines) | ~247 | +| 05:39 | Session end: 48 writes across 20 files (configcompare.h, test_configcompare.c, meson.build, controller_test.c, configcompare.c) | 39 reads | ~427537 tok | +| 05:46 | Edited .claude/skills/xce-test-ha/run-ha-soak.sh | modified PASS() | ~460 | +| 05:47 | Edited .claude/skills/xce-test-ha/SKILL.md | inline fix | ~45 | +| 05:48 | Edited .claude/skills/xce-test-ha/SKILL.md | 3→5 lines | ~123 | +| 05:49 | Edited .claude/skills/xce-test-ha/SKILL.md | modified PASS() | ~1054 | +| 06:03 | Session end: 52 writes across 21 files (configcompare.h, test_configcompare.c, meson.build, controller_test.c, configcompare.c) | 41 reads | ~430394 tok | +| 06:58 | Verified prior agent's task 8.6 work (bug-1468 fix, Parts A-D) coherent via read | cluster.c, request.c, xceapi.c, client.c, test.c | all correct, matches server-side decode expectations | ~15k | +| 06:59 | Added --config-upgrade dispatch block (array-soak-style: hard-fail internal, no scan_bug924) | run-ha-soak.sh | inserted after array-chaos-retry block | ~600 | +| 06:59 | Documented --config-upgrade mode: env-var table + XCE_HA_MODE list + full subsection | SKILL.md | matches array-chaos-retry depth | ~900 | +| 07:00 | Full clean build (ninja -C src/xce.build), verified fresh binaries | xce_controller, xce_test, xceadmin | 0 errors | ~2k | +| 07:01 | Ran live --config-upgrade soak: /tmp/xce-ha-configupgrade | run-ha-soak.sh | upgrade genuinely interleaved w/ 3 chaotic kills, committed, 6/6 jobs survived, but snapdiff FAILED: ctrl-1 checkpoint 51569B vs ctrl-2/3 51621B | ~8k | +| 07:10 | Root-caused divergence: do_upgrade_config_with_bytes never calls config_activate_committed on originating primary, so c->myconf queue table stays stale until a later event; ctrl-1 killed before that could happen | config_repl.c, ha.c, persist.c (read-only) | logged bug-1469, live empirical repro of bug-857's hypothesis via a 3rd distinct mechanism | ~20k | +| 07:11 | Logged bug-1469 to buglog.json (related to bug-857, bug-1466); did NOT fix (out of task 8.6 scope, tasks 1-7 territory) | buglog.json | valid JSON, 788 entries | ~3k | +| 06:25 | Session end: 52 writes across 21 files (configcompare.h, test_configcompare.c, meson.build, controller_test.c, configcompare.c) | 42 reads | ~547481 tok | +| 06:54 | Edited src/controller/testsuite/test_config_repl.c | modified soak() | ~1961 | +| 06:55 | Edited src/controller/testsuite/test_config_repl.c | modified XCE_TESTING() | ~83 | +| 06:56 | Session end: 54 writes across 22 files (configcompare.h, test_configcompare.c, meson.build, controller_test.c, configcompare.c) | 43 reads | ~550527 tok | +| 06:57 | Edited src/controller/persist.c | modified and() | ~1627 | +| 06:59 | Edited src/controller/persist.c | expanded (+14 lines) | ~253 | +| 07:06 | Edited src/controller/persist.c | added 1 condition(s) | ~354 | +| 07:24 | Edited src/controller/persist.c | added 1 condition(s) | ~1792 | +| 14:26 | Ran full /xce-build controller (nix develop + xce-build.sh); 1st attempt failed on transient meson/ninja capnp-header race (unrelated to code), 2nd clean rebuild compiled clean but controller_unit_test reproducibly FAILED test_commit_advance_retry_clears_push_before_commit_fence (4/4 runs) — logged bug-1470, needs triage before task 8.6 soak | src/xce.build/controller/*, .wolf/buglog.json | build green, 1 test red | ~large | +| 07:26 | Edited src/controller/persist.c | removed 82 lines | ~59 | +| 07:28 | Session end: 59 writes across 23 files (configcompare.h, test_configcompare.c, meson.build, controller_test.c, configcompare.c) | 43 reads | ~559722 tok | +| 07:37 | Edited src/controller/testsuite/test_config_repl.c | expanded (+17 lines) | ~750 | +| 07:38 | Edited .claude/skills/xce-test-ha/run-ha-soak.sh | expanded (+20 lines) | ~834 | +| 07:41 | Edited .claude/skills/xce-test-ha/SKILL.md | expanded (+9 lines) | ~257 | +| 07:47 | Edited src/controller/persist.c | expanded (+6 lines) | ~317 | +| 14:50 | Task 8.6 wrap-up: fixed persist.c config_activate_committed ordering (bug-1469 pt1), diagnosed+documented deep qmgr live-sync gap (bug-1469 pt2, needs owner), diagnosed+documented 1-byte host-frame divergence (bug-1471, needs owner), switched soak's upgrade-target change from add-queue to update-queue to avoid the unrelated gap | persist.c, run-ha-soak.sh, SKILL.md, buglog.json | 3 real bugs found via live soak; 1 fixed+verified, 2 documented for tasks 1-7 owners | ~1200 | +| 07:56 | Session end: 63 writes across 23 files (configcompare.h, test_configcompare.c, meson.build, controller_test.c, configcompare.c) | 44 reads | ~570970 tok | +| 08:05 | Created ../../../../../../tmp/claude-1000/-home-rshen-projects-xce-worktrees-config/d3f40b2e-8c73-4820-8ad3-1400be8761ac/scratchpad/update_bug1471.py | — | ~439 | +| 08:12 | Session end: 64 writes across 24 files (configcompare.h, test_configcompare.c, meson.build, controller_test.c, configcompare.c) | 44 reads | ~571409 tok | +| 08:43 | Session end: 64 writes across 24 files (configcompare.h, test_configcompare.c, meson.build, controller_test.c, configcompare.c) | 44 reads | ~571727 tok | +| 08:47 | Edited .kiro/specs/config-upgrade-snapshot/tasks.md | modified progress() | ~1227 | +| 08:48 | Session end: 65 writes across 24 files (configcompare.h, test_configcompare.c, meson.build, controller_test.c, configcompare.c) | 44 reads | ~573041 tok | +| 09:11 | Session end: 65 writes across 24 files (configcompare.h, test_configcompare.c, meson.build, controller_test.c, configcompare.c) | 44 reads | ~573041 tok | +| 16:36 | bug-1471 root-caused: byte-precise capnp decode of preserved checkpoints proves the divergent byte is inside HostAdminState.status (0x00500000 CLOSED\|CLOSED_BY_ADMIN on ctrl-1 vs 0x0 on ctrl-2/ctrl-3), not capnp padding (calloc-zeroed, verified via disasm of libCapnC_Runtime.so create_local). True cause: worker_from_capnp (worker.c:827-856, predates spec by ~2.5mo) EEXIST-short-circuits WAL_WORKER_CTRL UPDATE/DEAD applies on standbys, silently dropping admin-status changes for already-joined hosts -- general host-control replication bug, out of config-upgrade-snapshot scope. Filed as bug-1472, cross-referenced from bug-1471. No production code changed (out-of-scope, not patched). | .wolf/buglog.json | root-caused, routed out-of-scope, buglog updated | ~large | +| 09:39 | Edited .kiro/specs/config-upgrade-snapshot/tasks.md | 6→7 lines | ~482 | +| 09:44 | Session end: 66 writes across 24 files (configcompare.h, test_configcompare.c, meson.build, controller_test.c, configcompare.c) | 46 reads | ~609994 tok | +| 10:09 | Edited src/controller/testsuite/test_upgrade_snapshot_apply.c | 5→8 lines | ~145 | +| 10:10 | Edited src/controller/testsuite/test_upgrade_snapshot_apply.c | added 4 condition(s) | ~2731 | +| 10:10 | Edited src/controller/testsuite/test_upgrade_snapshot_apply.c | 2→3 lines | ~44 | +| 10:16 | Session end: 69 writes across 25 files (configcompare.h, test_configcompare.c, meson.build, controller_test.c, configcompare.c) | 48 reads | ~635904 tok | +| 10:20 | Edited src/controller/testsuite/test_config_repl.c | 5→9 lines | ~107 | +| 10:22 | Edited src/controller/testsuite/test_config_repl.c | added error handling | ~3652 | +| 10:22 | Edited src/controller/testsuite/test_config_repl.c | 3→3 lines | ~49 | +| 10:23 | Edited src/controller/testsuite/test_config_repl.c | modified XCE_TESTING() | ~127 | +| 10:24 | Edited src/controller/testsuite/test_config_repl.c | 3→6 lines | ~97 | +| 10:48 | Session end: 74 writes across 25 files (configcompare.h, test_configcompare.c, meson.build, controller_test.c, configcompare.c) | 49 reads | ~640223 tok | +| 10:53 | Session end: 74 writes across 25 files (configcompare.h, test_configcompare.c, meson.build, controller_test.c, configcompare.c) | 49 reads | ~640223 tok | +| 10:57 | Session end: 74 writes across 25 files (configcompare.h, test_configcompare.c, meson.build, controller_test.c, configcompare.c) | 49 reads | ~640223 tok | +| 11:16 | Edited .kiro/specs/config-upgrade-snapshot/tasks.md | inline fix | ~23 | +| 11:19 | Edited .kiro/specs/config-upgrade-snapshot/tasks.md | modified twice() | ~663 | + +## Session: 2026-07-25 11:26 + +| Time | Action | File(s) | Outcome | ~Tokens | +|------|--------|---------|---------|--------| +| 11:59 | Edited src/controller/testsuite/test_config_repl.c | added 12 condition(s) | ~4947 | +| 12:01 | Edited src/controller/testsuite/test_config_repl.c | 2→7 lines | ~133 | +| 12:11 | Edited src/controller/testsuite/test_config_repl.c | expanded (+12 lines) | ~455 | +| 12:11 | Edited src/controller/testsuite/test_config_repl.c | 4→8 lines | ~127 | +| 12:46 | Edited .kiro/specs/config-upgrade-snapshot/tasks.md | inline fix | ~31 | +| 12:47 | Edited .kiro/specs/config-upgrade-snapshot/tasks.md | modified 8() | ~691 | +| 13:09 | Edited .claude/skills/xce-test-ha/run-ha-soak.sh | modified 9() | ~731 | +| 13:11 | Edited .claude/skills/xce-test-ha/run-ha-soak.sh | expanded (+15 lines) | ~330 | +| 13:12 | Edited .claude/skills/xce-test-ha/run-ha-soak.sh | 2→3 lines | ~51 | +| 13:12 | Edited .claude/skills/xce-test-ha/run-ha-soak.sh | modified 9() | ~369 | +| 13:14 | Edited .claude/skills/xce-test-ha/run-ha-soak.sh | modified wal_dir() | ~4510 | +| 13:15 | Edited .claude/skills/xce-test-ha/run-ha-soak.sh | modified PASS() | ~463 | +| 13:18 | Edited .claude/skills/xce-test-ha/SKILL.md | added error handling | ~1699 | +| 13:19 | Edited .claude/skills/xce-test-ha/SKILL.md | inline fix | ~52 | +| 13:19 | Edited .claude/skills/xce-test-ha/SKILL.md | 3→6 lines | ~178 | +| 13:35 | Ran live 3-node soak --config-upgrade-wal-trim (2x, reproducible) | .claude/skills/xce-test-ha/run-ha-soak.sh | FAIL both runs — real bug found, not test-script flaw | ~9000 | +| 13:50 | Root-caused live-soak failure via ctrl-2.log forensics: late-joiner slot-reuse clobbers bug-1147 disconnect guard | src/controller/ha.c, src/controller/repl.c | root cause confirmed, 2/2 reproducible | ~6500 | +| 13:52 | Logged bug-1474 (late-joiner reconnect clobbers disconnected-standby's WAL-trim guard via slot reuse) | .wolf/buglog.json | new entry appended, NOT fixed (out of task 8.9 scope) | ~2100 | +| 13:53 | Task 8.9 implementation: run_config_upgrade_wal_trim_round added and verified sound; task BLOCKED on bug-1474 | .claude/skills/xce-test-ha/run-ha-soak.sh, SKILL.md, .wolf/buglog.json, .wolf/cerebrum.md | infra correct, live PASS blocked on separate HA defect | ~1200 | +| 14:09 | Edited .kiro/specs/config-upgrade-snapshot/tasks.md | 3→4 lines | ~513 | +| 14:10 | Edited .kiro/specs/config-upgrade-snapshot/tasks.md | modified 9() | ~794 | +| 20:04 | Edited src/controller/testsuite/test_repl_unit.c | modified RED() | ~1771 | +| 20:04 | Edited src/controller/testsuite/test_repl_unit.c | 3→6 lines | ~89 | +| 20:10 | Edited src/controller/repl.c | added 3 condition(s) | ~656 | +| 20:12 | Created ../../../../../../tmp/claude-1000/-home-rshen-projects-xce-worktrees-config/d3f40b2e-8c73-4820-8ad3-1400be8761ac/scratchpad/update_bug1474.py | — | ~1227 | +| 20:14 | Edited src/controller/worker.c | added 1 condition(s) | ~842 | +| 20:15 | Edited src/controller/testsuite/test_apply_committed_entry.c | modified tace_build_worker_ctrl_pkt() | ~2190 | +| 20:15 | Edited src/controller/testsuite/test_apply_committed_entry.c | 2→5 lines | ~92 | +| 20:16 | bug-1474 FIXED: repl_add_standby two-pass slot allocation (virgin-slot-first, then oldest-guard fallback) — TDD RED (2 new tests fail pre-fix) → GREEN (1030 tests, 0 failures, no regressions vs 1028 baseline) | src/controller/repl.c, src/controller/testsuite/test_repl_unit.c, .wolf/buglog.json | fixed + verified, buglog "fix" field updated (forensic history preserved) | ~large | +| 20:29 | bug-1472 FIXED: worker_from_capnp() now decodes hook_detail and, for an already-existing worker, REPLACES (not ORs) XCE_WORKER_ADMIN_MASK bits from the decoded HOOK_DETAIL_WORKER_UPDATE payload instead of unconditionally returning -EEXIST — admin hostctrl -c/-o now propagates to standbys/own-WAL-replay. HOOK_DETAIL_WORKER_JOIN unchanged (-EEXIST no-op, regression-guarded). HOOK_DETAIL_WORKER_DEAD deliberately deferred (investigated: w->host.resvals live resource-value zarray isn't in the Worker capnp wire schema at all — logged as bug-1472-remainder). TDD: RED (2 new UPDATE tests fail against pre-fix code, confirmed) → GREEN (fix applied, full suite 1030→1033 tests, 0 failures, net +3 = exactly the new tests, zero regressions). persist.c untouched (its WAL_WORKER_CTRL apply case already generically handles any non-EEXIST-non-negative return). | src/controller/worker.c, src/controller/testsuite/test_apply_committed_entry.c, .wolf/buglog.json, .wolf/anatomy.md | fixed + verified, buglog bug-1472 "fix" field updated + bug-1472-remainder filed (forensic history preserved) | ~large | +| 20:48 | Edited src/controller/repl.c | added 1 condition(s) | ~454 | +| 21:03 | bug-1474 review REMEDIATED: reviewer rejected on 1 finding (Pass 2 guard-slot-reuse memset was silent, no WARN, undercutting the fix's own "make silent destruction visible" goal). Added used_fallback_slot tracking + WARN("repl_add_standby: reusing guard-holding slot...") right before the memset, mirroring repl_broadcast's existing WARN convention. No new test needed (log line only) — verified via `strings` on the built binary + both existing bug-1474 tests still passing. Hit one transient shared-build-dir artifact (stale worker.c.o from a concurrent sibling agent's in-flight build caused 2 spurious bug-1472-test failures on one run) — resolved via `touch` + rebuild, not a real regression. Final: full suite 1033 tests, 0 failures. | src/controller/repl.c, .wolf/buglog.json, .wolf/anatomy.md | remediated + verified, buglog bug-1474 "fix" field appended with [UPDATE] note (forensic history preserved) | ~large | +| 04:44 | bug-1474 live-soak RE-VERIFICATION (run-ha-soak.sh --config-upgrade-wal-trim, post-fix, deploy /home/claude/tmp/xce-ha-waltrim3): CORE ASSERTION PASSED — floor segment seg-...05.wal correctly PRESERVED, below-floor seg-01/03/04 correctly TRIMMED, active seg-...15.wal PRESENT (confirmed both via script log and independent on-disk `find`). New WARN("repl_add_standby: reusing guard-holding slot...") fired 2x on ctrl-2 (primary) — confirms the still-open ha.c duplicate-reconnect defect (bug-1474 fix-angle-(a), NOT fixed) is still spawning duplicate/late-joiner reconnects, exercising the fix's Pass-2 exhausted-fallback path for real; despite that, the specific segment under test stayed protected this run. Round's OVERALL verdict still FAIL, but at a LATER, unrelated step ("cluster did not reconverge to 3-of-3 after restarting ctrl-1") — root-caused to TWO separate, pre-existing, out-of-scope defects, NEITHER the original bug-1474 symptom: (1) NEW crash — ctrl-3 ASAN heap-use-after-free in config_repl.c's load_primary_config/config_activate_committed/handle_repl_config_push path (logged as bug-1476); (2) ctrl-1's post-restart catch-up got stuck at lsn=21 needing just lsn=22, ctrl-2 retrying identically every ~3s with zero progress — exact match to already-logged, not-yet-fixed bug-1475 (prevIdx off-by-one in ha_dispatch_repl_action_for_standby/ha_stream_wal_to_standby). First soak attempt (subagent-launched via Bash run_in_background from inside an Agent-tool call) died silently mid-election when the subagent's own turn ended — background process did NOT survive subagent completion despite setsid nohup being used internally by run-ha-soak.sh's start_node (the DRIVER script itself, launched via the Bash tool's run_in_background flag rather than a raw shell `setsid nohup ... & disown`, did not survive). Relaunched directly from the main agent thread with explicit `setsid nohup ... & disown` + polling loop, which survived and completed cleanly. | .wolf/buglog.json (bug-1476 new entry) | bug-1474's own fix confirmed GOOD at live-soak level; 2 separate follow-on blockers identified for task 8.9 (bug-1475, bug-1476) | ~large | + +## Session: 2026-07-26 22:31 + +| Time | Action | File(s) | Outcome | ~Tokens | +|------|--------|---------|---------|--------| +| 22:36 | Created reports/jul19-jul26-2026.md | — | ~3715 | +| 22:36 | Session end: 1 writes across 1 files (jul19-jul26-2026.md) | 4 reads | ~237768 tok | +| 22:54 | Session end: 1 writes across 1 files (jul19-jul26-2026.md) | 11 reads | ~414061 tok | +| 23:03 | Edited src/controller/ha.c | added 2 condition(s) | ~900 | +| 23:03 | Edited src/controller/config_repl.c | modified 1475() | ~613 | +| 23:04 | Edited src/controller/config_repl.c | modified if() | ~38 | +| 23:12 | Edited src/controller/testsuite/test_config_repl.c | modified 1475() | ~578 | +| 23:13 | Edited src/controller/testsuite/test_config_repl.c | added error handling | ~281 | +| 03:41 | Session end: 6 writes across 4 files (jul19-jul26-2026.md, ha.c, config_repl.c, test_config_repl.c) | 13 reads | ~448433 tok | +| 03:42 | Edited src/controller/testsuite/test_config_repl.c | added 1 condition(s) | ~2472 | +| 03:43 | Edited src/controller/testsuite/test_config_repl.c | 2→3 lines | ~56 | + +## Session: 2026-07-27 01:17 + +| Time | Action | File(s) | Outcome | ~Tokens | +|------|--------|---------|---------|--------| +| 01:50 | Edited .kiro/specs/scheduler-framework/requirements.md | inline fix | ~222 | +| 01:51 | Edited .kiro/specs/scheduler-framework/requirements.md | inline fix | ~295 | +| 01:52 | Edited .kiro/specs/scheduler-framework/requirements.md | modified pointer() | ~2660 | +| 01:52 | Edited .kiro/specs/scheduler-framework/requirements.md | modified enum() | ~1084 | +| 01:53 | Edited .kiro/specs/scheduler-framework/requirements.md | expanded (+89 lines) | ~1478 | +| 01:54 | Edited .kiro/specs/scheduler-framework/spec.json | inline fix | ~11 | +| 01:54 | Session end: 6 writes across 2 files (requirements.md, spec.json) | 8 reads | ~40857 tok | +| 02:07 | Session end: 6 writes across 2 files (requirements.md, spec.json) | 9 reads | ~40857 tok | +| 02:09 | Edited .kiro/specs/scheduler-framework/requirements.md | added 2 condition(s) | ~862 | +| 02:10 | Edited .kiro/specs/scheduler-framework/requirements.md | 14→16 lines | ~450 | +| 02:11 | Edited .kiro/specs/scheduler-framework/requirements.md | modified v2() | ~679 | +| 02:11 | Edited .kiro/specs/scheduler-framework/requirements.md | 6→4 lines | ~277 | +| 02:12 | Edited .kiro/specs/scheduler-framework/requirements.md | modified struct() | ~325 | +| 02:12 | Edited .kiro/specs/scheduler-framework/requirements.md | modified next_job() | ~767 | +| 02:16 | Session end: 12 writes across 2 files (requirements.md, spec.json) | 10 reads | ~46842 tok | +| 02:18 | Edited .kiro/specs/scheduler-framework/requirements.md | expanded (+32 lines) | ~904 | +| 02:18 | Edited .kiro/specs/scheduler-framework/requirements.md | 7→7 lines | ~277 | +| 02:19 | Edited .kiro/specs/scheduler-framework/requirements.md | modified pending() | ~957 | +| 02:19 | Session end: 15 writes across 2 files (requirements.md, spec.json) | 10 reads | ~49731 tok | +| 02:28 | Edited .kiro/specs/scheduler-framework/requirements.md | 12→7 lines | ~405 | +| 02:28 | Edited .kiro/specs/scheduler-framework/requirements.md | 2→2 lines | ~137 | +| 02:28 | Edited .kiro/specs/scheduler-framework/requirements.md | "project → queue → job" → "xce_job_picker_iface_t" | ~458 | +| 02:29 | Edited .kiro/specs/scheduler-framework/requirements.md | "ha-consistency-invariants" → "builtin_fcfs" | ~314 | +| 02:29 | Edited .kiro/specs/scheduler-framework/requirements.md | 12→12 lines | ~282 | +| 02:30 | Edited .kiro/specs/scheduler-framework/requirements.md | modified Preemption() | ~285 | +| 02:31 | Session end: 21 writes across 2 files (requirements.md, spec.json) | 10 reads | ~52078 tok | +| 02:35 | Created .kiro/specs/scheduler-framework/brief.md | — | ~6523 | +| 02:36 | Session end: 22 writes across 3 files (requirements.md, spec.json, brief.md) | 10 reads | ~59067 tok | +| 02:56 | Edited .kiro/specs/scheduler-framework/requirements.md | added 1 condition(s) | ~1009 | +| 02:56 | Session end: 23 writes across 3 files (requirements.md, spec.json, brief.md) | 10 reads | ~60293 tok | +| 03:09 | Edited .kiro/specs/scheduler-framework/requirements.md | 3→3 lines | ~96 | +| 03:09 | Edited .kiro/specs/scheduler-framework/requirements.md | 3→1 lines | ~13 | +| 03:10 | Edited .kiro/specs/scheduler-framework/requirements.md | removed 69 lines | ~87 | +| 03:11 | Edited .kiro/specs/scheduler-framework/requirements.md | added 1 condition(s) | ~1185 | +| 03:11 | Session end: 27 writes across 3 files (requirements.md, spec.json, brief.md) | 10 reads | ~61772 tok | +| 03:22 | Edited .kiro/specs/scheduler-framework/requirements.md | added 2 condition(s) | ~1754 | +| 03:23 | Session end: 28 writes across 3 files (requirements.md, spec.json, brief.md) | 10 reads | ~64586 tok | +| 03:29 | Edited .kiro/specs/scheduler-framework/requirements.md | slots() → slot() | ~62 | +| 03:30 | Session end: 29 writes across 3 files (requirements.md, spec.json, brief.md) | 10 reads | ~65362 tok | +| 03:33 | Edited .kiro/specs/scheduler-framework/requirements.md | added 1 condition(s) | ~572 | +| 03:33 | Edited .kiro/specs/scheduler-framework/requirements.md | modified pointer() | ~366 | +| 03:34 | Edited .kiro/specs/scheduler-framework/requirements.md | 3→5 lines | ~74 | +| 03:35 | Edited .kiro/specs/scheduler-framework/requirements.md | modified pointer() | ~1197 | +| 03:35 | Edited .kiro/specs/scheduler-framework/requirements.md | 14 → 15 | ~27 | +| 03:36 | Edited .kiro/specs/scheduler-framework/requirements.md | 15 → 16 | ~15 | +| 03:36 | Session end: 35 writes across 3 files (requirements.md, spec.json, brief.md) | 10 reads | ~68162 tok | +| 03:40 | Edited .kiro/specs/scheduler-framework/requirements.md | modified directly() | ~472 | +| 03:41 | Edited .kiro/specs/scheduler-framework/requirements.md | 7→8 lines | ~135 | +| 03:41 | Session end: 37 writes across 3 files (requirements.md, spec.json, brief.md) | 10 reads | ~69033 tok | +| 03:43 | Edited .kiro/specs/scheduler-framework/requirements.md | 3→8 lines | ~374 | +| 03:43 | Session end: 38 writes across 3 files (requirements.md, spec.json, brief.md) | 10 reads | ~69453 tok | +| 03:50 | Edited .kiro/specs/scheduler-framework/requirements.md | 4→4 lines | ~227 | +| 03:51 | Edited .kiro/specs/scheduler-framework/requirements.md | modified via() | ~450 | +| 03:51 | Session end: 40 writes across 3 files (requirements.md, spec.json, brief.md) | 11 reads | ~70526 tok | +| 03:55 | Edited .kiro/specs/scheduler-framework/requirements.md | modified directly() | ~842 | +| 03:56 | Edited .kiro/specs/scheduler-framework/requirements.md | 2→6 lines | ~121 | +| 03:56 | Session end: 42 writes across 3 files (requirements.md, spec.json, brief.md) | 11 reads | ~72053 tok | +| 04:01 | Session end: 42 writes across 3 files (requirements.md, spec.json, brief.md) | 13 reads | ~72053 tok | +| 04:04 | Edited .kiro/specs/scheduler-framework/requirements.md | expanded (+16 lines) | ~707 | +| 04:05 | Session end: 43 writes across 3 files (requirements.md, spec.json, brief.md) | 13 reads | ~72887 tok | +| 19:36 | Edited src/controller/testsuite/test_config_repl.c | 10→14 lines | ~213 | +| 19:41 | Session end: 44 writes across 4 files (requirements.md, spec.json, brief.md, test_config_repl.c) | 15 reads | ~262461 tok | +| 19:52 | Edited src/controller/config_repl.c | modified if() | ~180 | +| 19:53 | Edited src/controller/ha.c | modified persist_durable_floor() | ~231 | +| 19:53 | Edited src/controller/ha.c | modified if() | ~167 | +| 19:53 | Edited src/controller/ha.c | expanded (+9 lines) | ~223 | +| 19:53 | Edited src/controller/ha.c | added error handling | ~166 | +| 19:54 | Edited src/lib/raft/raft.c | modified on_get_entry_term() | ~243 | +| 19:54 | Edited src/lib/raft/raft.c | expanded (+6 lines) | ~209 | +| 19:54 | Edited src/lib/raft/raft.c | 3→4 lines | ~56 | +| 19:54 | Edited src/lib/raft/raft.c | 4→6 lines | ~87 | +| 19:55 | Edited src/lib/raft/raft.c | 1→2 lines | ~22 | +| 19:59 | Edited src/controller/testsuite/test_config_repl.c | 4→5 lines | ~49 | +| 19:59 | Edited src/controller/testsuite/test_config_repl.c | expanded (+8 lines) | ~167 | +| 19:59 | Edited src/controller/testsuite/test_config_repl.c | 4→5 lines | ~48 | +| 20:02 | Session end: 57 writes across 7 files (requirements.md, spec.json, brief.md, test_config_repl.c, config_repl.c) | 18 reads | ~391509 tok | +| 20:05 | Edited src/controller/persist.c | added error handling | ~1320 | +| 20:07 | Edited src/controller/config_repl.c | removed 13 lines | ~27 | +| 20:07 | Edited src/controller/ha.c | removed 18 lines | ~46 | +| 20:07 | Edited src/controller/ha.c | modified if() | ~67 | +| 20:07 | Edited src/controller/ha.c | reduced (-9 lines) | ~63 | +| 20:08 | Edited src/controller/ha.c | reduced (-9 lines) | ~36 | +| 20:08 | Edited src/lib/raft/raft.c | reduced (-9 lines) | ~92 | +| 20:08 | Edited src/lib/raft/raft.c | reduced (-6 lines) | ~98 | +| 20:08 | Edited src/lib/raft/raft.c | 4→3 lines | ~36 | +| 20:08 | Edited src/lib/raft/raft.c | 6→4 lines | ~49 | +| 20:09 | Edited src/lib/raft/raft.c | 2→1 lines | ~5 | +| 20:09 | Edited src/controller/testsuite/test_config_repl.c | 5→4 lines | ~35 | +| 20:09 | Edited src/controller/testsuite/test_config_repl.c | reduced (-8 lines) | ~38 | +| 20:09 | Edited src/controller/testsuite/test_config_repl.c | 2→1 lines | ~7 | +| 20:14 | Edited src/controller/testsuite/test_config_repl.c | modified side() | ~880 | +| 20:14 | Edited src/controller/testsuite/test_config_repl.c | modified RED() | ~45 | +| 20:15 | Edited src/controller/ha.c | added error handling | ~416 | +| 20:16 | Edited src/controller/config_repl.c | expanded (+18 lines) | ~410 | +| 03:22 | bug-1475: root-caused via real fprintf instrumentation (streamer/JIT-resync/raft logOk) that the two already-landed fixes left applied_lsn stuck at 0 | src/controller/persist.c (TERM_INDEX_UNSET sentinel fix), src/controller/ha.c + config_repl.c (cross-ref comments only), src/controller/testsuite/test_config_repl.c (doc comments), .wolf/buglog.json | FIXED: full suite 1034/1034 (was 1033/1034); term-index growth silently reclassified a skipped WAL_CHECKPOINT lsn's term from absent(0) to WAL_LEGACY_TERM(1) once a later lsn was recorded, causing sender/receiver to disagree on prev_log_term | ~140k | +| 20:28 | Session end: 75 writes across 8 files (requirements.md, spec.json, brief.md, test_config_repl.c, config_repl.c) | 19 reads | ~419701 tok | +| 20:48 | Session end: 75 writes across 8 files (requirements.md, spec.json, brief.md, test_config_repl.c, config_repl.c) | 21 reads | ~423430 tok | +| 20:52 | Session end: 75 writes across 8 files (requirements.md, spec.json, brief.md, test_config_repl.c, config_repl.c) | 22 reads | ~459739 tok | +| 20:55 | Session end: 75 writes across 8 files (requirements.md, spec.json, brief.md, test_config_repl.c, config_repl.c) | 22 reads | ~459739 tok | +| 20:57 | Created .kiro/specs/scheduler-core/spec.json | — | ~202 | +| 20:57 | Created .kiro/specs/scheduler-allocation/spec.json | — | ~210 | +| 20:58 | Created .kiro/specs/scheduler-preemption/spec.json | — | ~213 | +| 21:00 | Created .kiro/specs/scheduler-framework/spec.json | — | ~211 | +| 21:01 | Session end: 79 writes across 8 files (requirements.md, spec.json, brief.md, test_config_repl.c, config_repl.c) | 30 reads | ~467627 tok | +| 21:03 | Edited src/controller/persist.c | added error handling | ~835 | +| 21:04 | Created .kiro/specs/scheduler-allocation/brief.md | — | ~3600 | +| 21:05 | Edited src/controller/testsuite/test_config_repl.c | added error handling | ~2390 | +| 21:06 | Edited src/controller/testsuite/test_config_repl.c | 3→7 lines | ~91 | +| 21:06 | Edited src/controller/testsuite/test_config_repl.c | 2→3 lines | ~58 | +| 21:07 | Created .kiro/specs/scheduler-preemption/brief.md | — | ~3104 | +| 21:07 | Created .kiro/specs/scheduler-preemption/requirements.md | — | ~2437 | +| 21:10 | Session end: 86 writes across 8 files (requirements.md, spec.json, brief.md, test_config_repl.c, config_repl.c) | 30 reads | ~484551 tok | +| 21:12 | Edited src/controller/testsuite/test_config_repl.c | expanded (+27 lines) | ~618 | +| 21:14 | Edited src/controller/testsuite/test_config_repl.c | 3→6 lines | ~103 | +| 21:15 | Created .kiro/specs/scheduler-core/brief.md | — | ~2121 | +| 21:16 | Session end: 89 writes across 8 files (requirements.md, spec.json, brief.md, test_config_repl.c, config_repl.c) | 30 reads | ~488105 tok | +| 21:16 | Edited src/controller/testsuite/test_config_repl.c | expanded (+12 lines) | ~628 | +| 21:17 | Created .kiro/specs/scheduler-allocation/requirements.md | — | ~6636 | +| 21:17 | Edited src/controller/persist.c | 6→3 lines | ~35 | +| 21:18 | Created .kiro/specs/scheduler-core/requirements.md | — | ~9658 | +| 04:18 | Created brief.md and requirements.md for scheduler-allocation spec at .kiro/specs/scheduler-allocation/ | brief.md, requirements.md | Both files written, scoped to allocation-only concerns (plan_iter, host_iter, parjob, resreq cache, seqjob rewrap) | ~18000tok | +| 21:21 | Session end: 93 writes across 8 files (requirements.md, spec.json, brief.md, test_config_repl.c, config_repl.c) | 31 reads | ~506322 tok | +| 21:22 | Edited src/controller/persist.c | 3→6 lines | ~120 | +| 21:27 | Session end: 94 writes across 8 files (requirements.md, spec.json, brief.md, test_config_repl.c, config_repl.c) | 31 reads | ~506427 tok | +| 21:35 | Edited src/controller/persist.c | 10→9 lines | ~81 | +| 21:36 | Edited src/controller/persist.c | 9→10 lines | ~74 | +| 21:46 | Edited src/include/persist.h | expanded (+6 lines) | ~231 | +| 21:46 | Edited src/controller/ha.c | 6→8 lines | ~160 | +| 21:51 | Session end: 98 writes across 9 files (requirements.md, spec.json, brief.md, test_config_repl.c, config_repl.c) | 32 reads | ~507012 tok | +| 22:06 | Edited src/include/myconf.h | 7→8 lines | ~35 | +| 22:06 | Edited src/include/myconf.h | expanded (+10 lines) | ~236 | +| 22:06 | Edited src/controller/myconf.c | modified myconf_fini() | ~92 | +| 22:06 | Edited src/controller/main.c | added 1 condition(s) | ~132 | +| 22:10 | Edited src/controller/config_repl.c | modified XCE_TESTING() | ~229 | +| 22:10 | Edited src/controller/config_repl.c | added 1 condition(s) | ~169 | +| 22:11 | Edited src/controller/config_repl.h | expanded (+10 lines) | ~221 | +| 22:11 | Session end: 105 writes across 13 files (requirements.md, spec.json, brief.md, test_config_repl.c, config_repl.c) | 40 reads | ~554405 tok | +| 22:11 | Edited src/controller/testsuite/test_config_repl.c | modified t43_attach_myconf() | ~235 | +| 22:14 | Edited src/controller/testsuite/test_config_repl.c | added 3 condition(s) | ~2535 | +| 22:14 | Edited src/controller/testsuite/test_config_repl.c | 3→5 lines | ~72 | +| 22:18 | Edited src/controller/testsuite/test_config_repl.c | expanded (+9 lines) | ~173 | +| 22:20 | Edited src/controller/config_repl.c | added 1 condition(s) | ~2124 | + +## Session: 2026-07-28 23:29 + +| Time | Action | File(s) | Outcome | ~Tokens | +|------|--------|---------|---------|--------| +| 00:28 | Edited .kiro/specs/scheduler-core/requirements.md | modified cbuf() | ~376 | +| 00:29 | Edited .kiro/specs/scheduler-core/requirements.md | added 2 condition(s) | ~646 | +| 00:29 | Edited .kiro/specs/scheduler-core/requirements.md | "sched_job_picker()" → "jbuf" | ~146 | +| 00:30 | Edited .kiro/specs/scheduler-core/requirements.md | inline fix | ~104 | +| 00:30 | Edited .kiro/specs/scheduler-core/requirements.md | inline fix | ~94 | +| 00:30 | Edited .kiro/specs/scheduler-core/requirements.md | added 1 condition(s) | ~886 | +| 00:31 | Edited .kiro/specs/scheduler-core/requirements.md | 4→5 lines | ~332 | +| 00:32 | Edited .kiro/specs/scheduler-core/requirements.md | modified next_job() | ~999 | +| 00:32 | Edited .kiro/specs/scheduler-core/requirements.md | modified struct() | ~247 | +| 00:33 | Edited .kiro/specs/scheduler-core/requirements.md | inline fix | ~141 | +| 00:33 | Session end: 10 writes across 1 files (requirements.md) | 13 reads | ~174206 tok | +| 00:33 | Session end: 10 writes across 1 files (requirements.md) | 13 reads | ~174206 tok | +| 00:40 | Edited src/controller/config_repl.c | modified XCE_TESTING() | ~1087 | + +## Session: 2026-07-28 00:54 + +| Time | Action | File(s) | Outcome | ~Tokens | +|------|--------|---------|---------|--------| +| 01:05 | Edited src/controller/config_repl.c | modified XCE_TESTING() | ~1156 | +| 01:14 | Session end: 1 writes across 1 files (config_repl.c) | 4 reads | ~133541 tok | +| 01:16 | Session end: 1 writes across 1 files (config_repl.c) | 4 reads | ~133541 tok | +| 01:18 | Session end: 1 writes across 1 files (config_repl.c) | 4 reads | ~133541 tok | +| 01:24 | Session end: 1 writes across 1 files (config_repl.c) | 4 reads | ~133541 tok | +| 01:34 | Session end: 1 writes across 1 files (config_repl.c) | 5 reads | ~219255 tok | +| 01:45 | Session end: 1 writes across 1 files (config_repl.c) | 7 reads | ~357623 tok | +| 01:47 | root-caused bug-1477 (ctrl-3 permanent catch-up wedge, skip_election never retries cluster_init_phase2 so commit engine/apply pump never wires) | .wolf/buglog.json, ha.c, myapp.c, cluster.c, persist.c | logged bug-1477, out-of-scope for config-upgrade-snapshot, routed upstream to HA bootstrap lineage | ~180000 tok | +| 01:47 | Edited .kiro/specs/config-upgrade-snapshot/tasks.md | added error handling | ~630 | +| 01:48 | Session end: 2 writes across 2 files (config_repl.c, tasks.md) | 7 reads | ~358297 tok | +| 01:51 | Session end: 2 writes across 2 files (config_repl.c, tasks.md) | 7 reads | ~358297 tok | +| 02:07 | Session end: 2 writes across 2 files (config_repl.c, tasks.md) | 9 reads | ~371122 tok | +| 02:12 | Edited src/controller/ha.c | added error handling | ~827 | +| 02:12 | Edited src/controller/ha.c | modified target() | ~158 | +| 02:12 | Edited src/controller/ha.h | modified for() | ~313 | +| 02:13 | Edited src/controller/testsuite/test_ha_role.c | added error handling | ~902 | +| 02:13 | Edited src/controller/testsuite/test_ha_role.c | 3→8 lines | ~138 | + +## Session: 2026-07-28 02:14 + +| Time | Action | File(s) | Outcome | ~Tokens | +|------|--------|---------|---------|--------| +| 02:20 | bug-1478 root-caused+fixed: ha_dispatch_repl_action_for_standby target_lsn leaked a WAL_CHECKPOINT-consumed LSN as a phantom convergence target, permanently wedging config-upgrade-wal-trim (task 8.9) catch-up; extracted ha_compute_repl_target_lsn, 4 new tests, RED->GREEN confirmed, 1040/1040 clean 2x | src/controller/ha.c, ha.h, testsuite/test_ha_role.c, .wolf/buglog.json, .wolf/cerebrum.md | fixed, unit-verified; live soak re-run still recommended | ~9500 | + +## Session: 2026-07-28 02:21 + +| Time | Action | File(s) | Outcome | ~Tokens | +|------|--------|---------|---------|--------| +| 02:27 | Edited src/controller/config_repl.c | modified used() | ~283 | +| 02:28 | Session end: 1 writes across 1 files (config_repl.c) | 3 reads | ~45187 tok | +| 02:30 | Session end: 1 writes across 1 files (config_repl.c) | 3 reads | ~45187 tok | +| 02:30 | Session end: 1 writes across 1 files (config_repl.c) | 3 reads | ~45187 tok | +| 02:31 | Session end: 1 writes across 1 files (config_repl.c) | 3 reads | ~45187 tok | +| 02:33 | Session end: 1 writes across 1 files (config_repl.c) | 3 reads | ~45187 tok | +| 02:35 | Session end: 1 writes across 1 files (config_repl.c) | 4 reads | ~63902 tok | +| 02:39 | Edited .kiro/specs/scheduler-core/requirements.md | added 2 condition(s) | ~1395 | +| 02:39 | Edited .kiro/specs/scheduler-core/requirements.md | expanded (+6 lines) | ~743 | +| 02:39 | Edited .kiro/specs/scheduler-core/requirements.md | modified struct() | ~52 | +| 02:40 | Edited .kiro/specs/scheduler-core/requirements.md | 9→10 lines | ~156 | +| 02:40 | Session end: 5 writes across 2 files (config_repl.c, requirements.md) | 4 reads | ~66417 tok | +| 02:43 | Edited .kiro/specs/scheduler-core/requirements.md | inline fix | ~354 | +| 02:43 | Edited .kiro/specs/scheduler-core/requirements.md | 14→15 lines | ~620 | +| 02:44 | Session end: 7 writes across 2 files (config_repl.c, requirements.md) | 4 reads | ~69147 tok | +| 02:44 | Session end: 7 writes across 2 files (config_repl.c, requirements.md) | 4 reads | ~69147 tok | +| 02:47 | Edited src/controller/testsuite/test_convergence_verification.c | modified coverage() | ~250 | +| 02:47 | Session end: 8 writes across 3 files (config_repl.c, requirements.md, test_convergence_verification.c) | 4 reads | ~69415 tok | +| 02:47 | Edited src/controller/testsuite/test_convergence_verification.c | max() → ha_compute_repl_target_lsn() | ~36 | +| 02:48 | Edited src/controller/testsuite/test_convergence_verification.c | 3→5 lines | ~82 | +| 02:48 | Edited src/controller/testsuite/test_convergence_verification.c | 3→5 lines | ~82 | +| 02:49 | Edited .kiro/specs/scheduler-core/requirements.md | modified line() | ~768 | +| 02:49 | Session end: 12 writes across 3 files (config_repl.c, requirements.md, test_convergence_verification.c) | 5 reads | ~148861 tok | +| 02:49 | Session end: 12 writes across 3 files (config_repl.c, requirements.md, test_convergence_verification.c) | 5 reads | ~148861 tok | +| 02:51 | Session end: 12 writes across 3 files (config_repl.c, requirements.md, test_convergence_verification.c) | 5 reads | ~148861 tok | +| 02:51 | Edited .kiro/specs/scheduler-core/requirements.md | modified loop() | ~535 | +| 02:52 | Edited .kiro/specs/config-upgrade-snapshot/tasks.md | removed 6 lines | ~120 | +| 02:53 | Edited .kiro/specs/config-upgrade-snapshot/tasks.md | modified used() | ~615 | +| 02:53 | Edited .kiro/specs/scheduler-core/requirements.md | modified push() | ~1417 | +| 02:53 | Session end: 16 writes across 4 files (config_repl.c, requirements.md, test_convergence_verification.c, tasks.md) | 6 reads | ~164121 tok | +| 02:54 | Session end: 16 writes across 4 files (config_repl.c, requirements.md, test_convergence_verification.c, tasks.md) | 8 reads | ~184449 tok | +| 02:55 | Edited .kiro/specs/scheduler-core/requirements.md | inline fix | ~213 | +| 02:55 | Session end: 17 writes across 4 files (config_repl.c, requirements.md, test_convergence_verification.c, tasks.md) | 8 reads | ~184677 tok | +| 02:57 | Session end: 17 writes across 4 files (config_repl.c, requirements.md, test_convergence_verification.c, tasks.md) | 9 reads | ~195415 tok | +| 02:58 | Session end: 17 writes across 4 files (config_repl.c, requirements.md, test_convergence_verification.c, tasks.md) | 13 reads | ~417052 tok | +| 03:02 | Edited .kiro/specs/scheduler-core/requirements.md | 3→3 lines | ~101 | +| 03:02 | Edited .kiro/specs/scheduler-core/requirements.md | modified while() | ~1161 | +| 03:05 | Edited .kiro/specs/scheduler-core/requirements.md | expanded (+13 lines) | ~424 | +| 03:06 | Edited .kiro/specs/scheduler-core/requirements.md | modified struct() | ~106 | +| 03:06 | Session end: 21 writes across 4 files (config_repl.c, requirements.md, test_convergence_verification.c, tasks.md) | 15 reads | ~451981 tok | +| 03:14 | Edited .kiro/specs/scheduler-core/requirements.md | expanded (+15 lines) | ~453 | +| 03:14 | Session end: 22 writes across 4 files (config_repl.c, requirements.md, test_convergence_verification.c, tasks.md) | 15 reads | ~452506 tok | +| 05:21 | Session end: 22 writes across 4 files (config_repl.c, requirements.md, test_convergence_verification.c, tasks.md) | 15 reads | ~452506 tok | +| 05:21 | Session end: 22 writes across 4 files (config_repl.c, requirements.md, test_convergence_verification.c, tasks.md) | 15 reads | ~452506 tok | +| 06:06 | Edited src/controller/ha.h | modified exactly() | ~836 | +| 06:07 | Edited src/controller/ha.c | added 11 condition(s) | ~856 | +| 06:07 | Edited src/controller/myapp.c | modified if() | ~173 | +| 06:08 | Edited src/controller/ha.c | added 2 condition(s) | ~242 | +| 06:09 | Edited src/controller/ha.c | modified if() | ~279 | +| 06:10 | Edited src/controller/ha.c | added 2 condition(s) | ~257 | +| 06:11 | Edited src/controller/ha.c | added 2 condition(s) | ~414 | +| 06:11 | Edited src/controller/ha.c | added 2 condition(s) | ~319 | +| 06:13 | Edited src/controller/testsuite/test_config_repl.c | modified is() | ~1609 | +| 06:14 | Edited src/controller/testsuite/test_config_repl.c | 2→6 lines | ~119 | +| 06:16 | Session end: 32 writes across 8 files (config_repl.c, requirements.md, test_convergence_verification.c, tasks.md, ha.h) | 17 reads | ~498442 tok | +| 06:18 | Session end: 32 writes across 8 files (config_repl.c, requirements.md, test_convergence_verification.c, tasks.md, ha.h) | 17 reads | ~498442 tok | +| 06:26 | Session end: 32 writes across 8 files (config_repl.c, requirements.md, test_convergence_verification.c, tasks.md, ha.h) | 17 reads | ~498442 tok | +| 06:26 | Session end: 32 writes across 8 files (config_repl.c, requirements.md, test_convergence_verification.c, tasks.md, ha.h) | 17 reads | ~498442 tok | +| 07:06 | Created ../../../../../../tmp/claude-1000/-home-rshen-projects-xce-worktrees-config/c8633ffb-8da0-40a7-9811-48f1830c37b4/scratchpad/cross-spec-gap-analysis.md | — | ~2172 | +| 07:07 | Edited ../../../../../../tmp/claude-1000/-home-rshen-projects-xce-worktrees-config/c8633ffb-8da0-40a7-9811-48f1830c37b4/scratchpad/cross-spec-gap-analysis.md | 3→4 lines | ~143 | +| 07:07 | Session end: 34 writes across 9 files (config_repl.c, requirements.md, test_convergence_verification.c, tasks.md, ha.h) | 21 reads | ~512802 tok | +| 07:12 | Edited .kiro/specs/admin-config-tool/spec.json | modified 25() | ~375 | +| 07:12 | Edited .kiro/specs/admin-config-tool/spec.json | inline fix | ~136 | +| 07:12 | Edited .kiro/specs/admin-config-tool/tasks.md | inline fix | ~182 | +| 07:14 | Session end: 37 writes across 10 files (config_repl.c, requirements.md, test_convergence_verification.c, tasks.md, ha.h) | 23 reads | ~521081 tok | +| 07:29 | Session end: 37 writes across 10 files (config_repl.c, requirements.md, test_convergence_verification.c, tasks.md, ha.h) | 24 reads | ~529661 tok | +| 07:34 | Investigated force-elect job-submit FAIL in ~/tmp/xce-ha-configupgrade2 soak; refuted admission-slot-leak hypothesis, root-caused via xce_test waldump to a permanent ae_reject_logmismatch wedge (ctrl-2 lsn=13 term=3 vs canonical term=4) + NACK-ignored/pending_ack_count-never-decremented + no catch-up trigger on eviction | .wolf/buglog.json (bug-1479), .wolf/cerebrum.md | logged, not fixed (needs-owner, design decision) | ~180000 | +| 19:30 | Session end: 37 writes across 10 files (config_repl.c, requirements.md, test_convergence_verification.c, tasks.md, ha.h) | 24 reads | ~529661 tok | +| 19:31 | Session end: 37 writes across 10 files (config_repl.c, requirements.md, test_convergence_verification.c, tasks.md, ha.h) | 24 reads | ~529661 tok | +| 19:32 | Session end: 37 writes across 10 files (config_repl.c, requirements.md, test_convergence_verification.c, tasks.md, ha.h) | 24 reads | ~529661 tok | +| 19:41 | Edited src/include/repl.h | expanded (+10 lines) | ~204 | +| 19:41 | Edited src/controller/repl.c | modified just() | ~218 | +| 19:41 | Edited src/controller/repl.c | added 3 condition(s) | ~214 | +| 19:42 | Edited src/controller/ha.h | modified ha_raft_on_repl_nack() | ~434 | +| 19:42 | Edited src/controller/ha.c | added 3 condition(s) | ~439 | +| 19:42 | Edited src/controller/ha.c | added error handling | ~687 | +| 19:43 | Edited src/controller/ha.c | added 2 condition(s) | ~350 | +| 19:45 | Edited src/controller/testsuite/test_term_safety_adapter.c | added error handling | ~1320 | +| 19:45 | Edited src/controller/testsuite/test_term_safety_adapter.c | 2→6 lines | ~106 | +| 19:46 | Edited src/controller/testsuite/test_term_safety_adapter.c | modified test_nack_immediately_marks_catchup_at_corrected_lsn_not_after_16_strikes() | ~670 | +| 19:47 | Edited src/controller/testsuite/test_term_safety_adapter.c | 2→3 lines | ~59 | + +## Session: 2026-07-29 19:52 + +| Time | Action | File(s) | Outcome | ~Tokens | +|------|--------|---------|---------|--------| +| 19:55 | Edited src/controller/testsuite/test_term_safety_adapter.c | raft_init() → transition() | ~173 | +| 19:55 | Edited src/controller/testsuite/test_term_safety_adapter.c | 6→9 lines | ~110 | +| 19:55 | Edited src/controller/testsuite/test_term_safety_adapter.c | 11→15 lines | ~181 | +| 20:01 | Session end: 3 writes across 1 files (test_term_safety_adapter.c) | 4 reads | ~201524 tok | +| 20:05 | Session end: 3 writes across 1 files (test_term_safety_adapter.c) | 4 reads | ~201524 tok | +| 20:09 | Session end: 3 writes across 1 files (test_term_safety_adapter.c) | 4 reads | ~201524 tok | +| 20:11 | Edited .kiro/specs/scheduler-core/requirements.md | added 1 condition(s) | ~1739 | +| 20:11 | Session end: 4 writes across 2 files (test_term_safety_adapter.c, requirements.md) | 7 reads | ~262249 tok | +| 20:13 | Edited .kiro/specs/scheduler-core/requirements.md | 7→7 lines | ~167 | +| 20:13 | Edited .kiro/specs/scheduler-core/requirements.md | 3→3 lines | ~79 | +| 20:13 | Edited .kiro/specs/scheduler-core/requirements.md | 12 → 13 | ~9 | +| 20:13 | Edited .kiro/specs/scheduler-core/requirements.md | 11→11 lines | ~457 | +| 20:14 | Edited .kiro/specs/scheduler-core/requirements.md | inline fix | ~159 | +| 20:14 | Edited .kiro/specs/scheduler-core/requirements.md | 9→9 lines | ~344 | +| 20:14 | Edited .kiro/specs/scheduler-core/requirements.md | 17→19 lines | ~731 | +| 20:15 | Edited .kiro/specs/scheduler-core/requirements.md | 19 → 21 | ~9 | +| 20:15 | Edited .kiro/specs/scheduler-core/requirements.md | inline fix | ~18 | +| 20:15 | Edited .kiro/specs/scheduler-core/requirements.md | 16 → 18 | ~22 | +| 20:15 | Edited .kiro/specs/scheduler-core/requirements.md | inline fix | ~45 | +| 20:16 | Edited .kiro/specs/scheduler-core/requirements.md | inline fix | ~33 | +| 20:16 | Edited .kiro/specs/scheduler-core/requirements.md | 19 → 21 | ~25 | +| 20:16 | Edited .kiro/specs/scheduler-core/requirements.md | inline fix | ~30 | +| 20:17 | Edited .kiro/specs/scheduler-core/requirements.md | inline fix | ~6 | +| 20:20 | Session end: 19 writes across 2 files (test_term_safety_adapter.c, requirements.md) | 7 reads | ~266129 tok | +| 20:22 | Session end: 19 writes across 2 files (test_term_safety_adapter.c, requirements.md) | 7 reads | ~266129 tok | +| 20:29 | Edited src/controller/ha.h | modified XCE_TESTING() | ~548 | +| 20:29 | Edited src/controller/ha.c | added 1 condition(s) | ~450 | +| 20:29 | Edited src/controller/ha.c | expanded (+10 lines) | ~227 | +| 20:30 | Edited src/controller/testsuite/test_config_repl.c | added error handling | ~950 | +| 20:30 | Edited src/controller/testsuite/test_config_repl.c | 3→4 lines | ~64 | +| 20:31 | Edited src/controller/ha.c | 3→4 lines | ~35 | +| 20:32 | Edited src/controller/ha.c | 4→3 lines | ~21 | +| 20:33 | Created .kiro/specs/raft-adapter-conformance/spec.json | — | ~209 | +| 20:33 | Created .kiro/specs/raft-adapter-conformance/requirements.md | — | ~986 | +| 20:34 | Edited .kiro/specs/config-upgrade-snapshot/tasks.md | 2→2 lines | ~793 | +| 20:35 | Session end: 29 writes across 7 files (test_term_safety_adapter.c, requirements.md, ha.h, ha.c, test_config_repl.c) | 13 reads | ~401510 tok | +| 20:35 | Edited .kiro/specs/config-upgrade-snapshot/tasks.md | added error handling | ~858 | +| 20:35 | Edited .kiro/specs/config-upgrade-snapshot/spec.json | 3→4 lines | ~31 | +| 20:37 | Session end: 31 writes across 7 files (test_term_safety_adapter.c, requirements.md, ha.h, ha.c, test_config_repl.c) | 13 reads | ~402460 tok | +| 20:51 | Edited src/controller/ha.h | modified ha_compute_repl_stream_ceiling_lsn() | ~512 | +| 20:51 | Edited src/controller/ha.c | added 1 condition(s) | ~265 | +| 20:52 | Edited src/controller/ha.c | added 1 condition(s) | ~291 | +| 20:54 | Edited src/controller/ha.c | modified XCE_TESTING() | ~563 | +| 20:54 | Edited src/controller/ha.h | expanded (+7 lines) | ~181 | +| 20:55 | Edited src/controller/testsuite/test_ha_role.c | added error handling | ~870 | +| 20:55 | Edited src/controller/testsuite/test_ha_role.c | modified 1479() | ~134 | +| 20:55 | Edited src/controller/ha.c | modified ha_compute_repl_stream_ceiling_lsn() | ~110 | +| 20:58 | Edited src/controller/ha.c | added 1 condition(s) | ~105 | +| 21:01 | Session end: 40 writes across 8 files (test_term_safety_adapter.c, requirements.md, ha.h, ha.c, test_config_repl.c) | 17 reads | ~461541 tok | +| 21:03 | Session end: 40 writes across 8 files (test_term_safety_adapter.c, requirements.md, ha.h, ha.c, test_config_repl.c) | 17 reads | ~461541 tok | +| 21:06 | bug-1479 FULLY FIXED (3-layer: primary NACK routing + standby NACK sending + stream-ceiling widening) | ha.c, ha.h, repl.c, repl.h, test_config_repl.c, test_term_safety_adapter.c, test_ha_role.c | 1053/1053 tests + live soak PASS (3/3 force-elect rounds) | ~180000 | +| 21:08 | Edited .kiro/specs/config-upgrade-snapshot/tasks.md | 7→7 lines | ~277 | +| 21:08 | Edited .kiro/specs/config-upgrade-snapshot/tasks.md | added error handling | ~1047 | +| 21:09 | Edited .kiro/specs/config-upgrade-snapshot/spec.json | 23→22 lines | ~135 | +| 21:10 | Edited .kiro/specs/raft-adapter-conformance/requirements.md | added error handling | ~567 | +| 21:11 | Session end: 44 writes across 8 files (test_term_safety_adapter.c, requirements.md, ha.h, ha.c, test_config_repl.c) | 20 reads | ~464925 tok | +| 21:15 | Session end: 44 writes across 8 files (test_term_safety_adapter.c, requirements.md, ha.h, ha.c, test_config_repl.c) | 20 reads | ~464925 tok | +| 21:26 | Session end: 44 writes across 8 files (test_term_safety_adapter.c, requirements.md, ha.h, ha.c, test_config_repl.c) | 21 reads | ~472868 tok | +| 21:29 | Session end: 44 writes across 8 files (test_term_safety_adapter.c, requirements.md, ha.h, ha.c, test_config_repl.c) | 22 reads | ~486524 tok | +| 21:31 | Session end: 44 writes across 8 files (test_term_safety_adapter.c, requirements.md, ha.h, ha.c, test_config_repl.c) | 22 reads | ~486524 tok | +| 21:32 | Session end: 44 writes across 8 files (test_term_safety_adapter.c, requirements.md, ha.h, ha.c, test_config_repl.c) | 22 reads | ~486524 tok | + +## Session: 2026-07-29 21:33 + +| Time | Action | File(s) | Outcome | ~Tokens | +|------|--------|---------|---------|--------| + +## Session: 2026-07-29 23:38 + +| Time | Action | File(s) | Outcome | ~Tokens | +|------|--------|---------|---------|--------| +| 23:52 | Edited .kiro/specs/scheduler-allocation/requirements.md | inline fix | ~213 | +| 23:53 | Edited .kiro/specs/scheduler-allocation/requirements.md | inline fix | ~170 | +| 23:53 | Edited .kiro/specs/scheduler-allocation/requirements.md | modified function() | ~597 | +| 23:53 | Edited .kiro/specs/scheduler-allocation/requirements.md | 3→5 lines | ~84 | +| 23:53 | Edited .kiro/specs/scheduler-allocation/requirements.md | 3→3 lines | ~159 | +| 23:54 | Session end: 5 writes across 1 files (requirements.md) | 19 reads | ~335873 tok | +| 00:03 | Created .kiro/specs/raft-adapter-conformance/requirements.md | — | ~4819 | +| 00:04 | Edited .kiro/specs/raft-adapter-conformance/spec.json | 9→9 lines | ~66 | +| 00:04 | Edited .kiro/specs/raft-adapter-conformance/spec.json | inline fix | ~51 | +| 00:06 | Session end: 8 writes across 2 files (requirements.md, spec.json) | 20 reads | ~341363 tok | +| 00:37 | Created .kiro/specs/raft-adapter-conformance/research.md | — | ~5945 | +| 00:37 | Session end: 9 writes across 3 files (requirements.md, spec.json, research.md) | 22 reads | ~385308 tok | +| 00:39 | Edited .kiro/specs/scheduler-allocation/requirements.md | inline fix | ~227 | +| 00:40 | Edited .kiro/specs/scheduler-allocation/requirements.md | modified field() | ~540 | +| 00:40 | Edited .kiro/specs/scheduler-allocation/requirements.md | 5→5 lines | ~84 | +| 00:40 | Session end: 12 writes across 3 files (requirements.md, spec.json, research.md) | 22 reads | ~386220 tok | +| 00:43 | Session end: 12 writes across 3 files (requirements.md, spec.json, research.md) | 28 reads | ~394960 tok | +| 00:44 | Edited .kiro/specs/scheduler-allocation/requirements.md | added 1 condition(s) | ~832 | +| 00:44 | Edited .kiro/specs/scheduler-allocation/requirements.md | inline fix | ~186 | +| 00:44 | Session end: 14 writes across 3 files (requirements.md, spec.json, research.md) | 28 reads | ~396051 tok | +| 00:44 | Edited .kiro/specs/raft-adapter-conformance/spec.json | 4→4 lines | ~22 | +| 00:46 | Edited .kiro/specs/raft-adapter-conformance/research.md | modified pointer() | ~3431 | +| 00:47 | Session end: 16 writes across 3 files (requirements.md, spec.json, research.md) | 29 reads | ~405323 tok | +| 00:48 | Created .kiro/specs/raft-adapter-conformance/design.md | — | ~9013 | +| 00:49 | Edited .kiro/specs/raft-adapter-conformance/design.md | expanded (+7 lines) | ~398 | +| 00:49 | Edited .kiro/specs/raft-adapter-conformance/spec.json | 20→20 lines | ~155 | +| 00:49 | Edited .kiro/specs/scheduler-allocation/requirements.md | 1→2 lines | ~219 | +| 00:49 | Session end: 20 writes across 4 files (requirements.md, spec.json, research.md, design.md) | 29 reads | ~416007 tok | +| 00:49 | Session end: 20 writes across 4 files (requirements.md, spec.json, research.md, design.md) | 29 reads | ~416007 tok | +| 00:53 | Session end: 20 writes across 4 files (requirements.md, spec.json, research.md, design.md) | 30 reads | ~417097 tok | +| 00:54 | Edited .kiro/specs/scheduler-allocation/requirements.md | expanded (+10 lines) | ~352 | +| 00:54 | Session end: 21 writes across 4 files (requirements.md, spec.json, research.md, design.md) | 30 reads | ~417601 tok | +| 00:57 | Session end: 21 writes across 4 files (requirements.md, spec.json, research.md, design.md) | 30 reads | ~417601 tok | +| 01:03 | Session end: 21 writes across 4 files (requirements.md, spec.json, research.md, design.md) | 30 reads | ~417601 tok | +| 01:06 | Edited .kiro/specs/raft-adapter-conformance/requirements.md | inline fix | ~165 | +| 01:06 | Edited .kiro/specs/raft-adapter-conformance/design.md | inline fix | ~295 | +| 01:06 | Edited .kiro/specs/raft-adapter-conformance/design.md | inline fix | ~130 | +| 01:07 | Edited .kiro/specs/scheduler-allocation/requirements.md | added 4 condition(s) | ~1104 | +| 01:07 | Edited .kiro/specs/raft-adapter-conformance/design.md | 1→2 lines | ~97 | +| 01:08 | Edited .kiro/specs/raft-adapter-conformance/design.md | 3→3 lines | ~276 | +| 01:08 | Edited .kiro/specs/scheduler-allocation/requirements.md | modified struct() | ~372 | +| 01:08 | Session end: 28 writes across 4 files (requirements.md, spec.json, research.md, design.md) | 31 reads | ~433253 tok | +| 01:12 | Session end: 28 writes across 4 files (requirements.md, spec.json, research.md, design.md) | 31 reads | ~433253 tok | +| 01:14 | Edited .kiro/specs/scheduler-allocation/requirements.md | modified enum() | ~272 | +| 01:14 | Edited .kiro/specs/scheduler-allocation/requirements.md | xce_sched_ctx_t() → types() | ~168 | +| 01:14 | Edited .kiro/specs/scheduler-allocation/requirements.md | 9→9 lines | ~91 | +| 01:15 | Edited .kiro/specs/scheduler-allocation/requirements.md | 4→4 lines | ~62 | +| 01:15 | Session end: 32 writes across 4 files (requirements.md, spec.json, research.md, design.md) | 31 reads | ~433889 tok | +| 01:22 | Session end: 32 writes across 4 files (requirements.md, spec.json, research.md, design.md) | 31 reads | ~433889 tok | +| 01:24 | Edited .kiro/specs/scheduler-allocation/requirements.md | inline fix | ~204 | +| 01:24 | Edited .kiro/specs/scheduler-allocation/requirements.md | inline fix | ~9 | +| 01:24 | Edited .kiro/specs/scheduler-allocation/requirements.md | inline fix | ~85 | +| 01:24 | Session end: 35 writes across 4 files (requirements.md, spec.json, research.md, design.md) | 31 reads | ~434708 tok | +| 01:24 | Edited .kiro/specs/scheduler-allocation/requirements.md | "for_preemption" → "xce_alloc_mode_t alloc_mo" | ~20 | +| 01:25 | Session end: 36 writes across 4 files (requirements.md, spec.json, research.md, design.md) | 34 reads | ~438453 tok | +| 01:26 | Edited .kiro/specs/raft-adapter-conformance/design.md | 1→2 lines | ~337 | +| 01:29 | Created .kiro/specs/raft-adapter-conformance/tasks.md | — | ~2839 | +| 01:29 | Edited .kiro/specs/raft-adapter-conformance/tasks.md | reduced (-6 lines) | ~278 | +| 01:30 | Edited .kiro/specs/raft-adapter-conformance/tasks.md | 8→10 lines | ~278 | +| 01:30 | Edited .kiro/specs/raft-adapter-conformance/tasks.md | inline fix | ~34 | +| 01:39 | Edited .kiro/specs/raft-adapter-conformance/tasks.md | 9→11 lines | ~267 | +| 01:40 | Edited .kiro/specs/raft-adapter-conformance/tasks.md | 19→22 lines | ~793 | +| 01:40 | Edited .kiro/specs/raft-adapter-conformance/tasks.md | 3→4 lines | ~66 | +| 01:44 | Edited .kiro/specs/raft-adapter-conformance/tasks.md | 3→4 lines | ~53 | +| 01:44 | Edited .kiro/specs/raft-adapter-conformance/spec.json | 18→18 lines | ~104 | +| 01:44 | Session end: 46 writes across 5 files (requirements.md, spec.json, research.md, design.md, tasks.md) | 35 reads | ~447291 tok | +| 01:52 | Edited src/schema/controller.capnp | modified mapname() | ~178 | +| 01:52 | Edited src/include/typemap.h | 4→6 lines | ~92 | + +## Session: 2026-07-29 01:59 + +| Time | Action | File(s) | Outcome | ~Tokens | +|------|--------|---------|---------|--------| +| 02:10 | Edited .kiro/specs/raft-adapter-conformance/tasks.md | inline fix | ~22 | +| 02:10 | Edited .kiro/specs/raft-adapter-conformance/tasks.md | modified recipe() | ~326 | +| 02:11 | Edited .kiro/specs/scheduler-core/requirements.md | modified mapname() | ~1204 | +| 02:11 | scheduler-core AC 10: replaced notify path with OPCode_schedAdmin request-reply (capnp schema + controller forwarding + xceadmin CLI surface + permissions) | requirements.md | ~90 lines added | ~3k | +| 02:12 | Session end: 3 writes across 2 files (tasks.md, requirements.md) | 9 reads | ~51256 tok | +| 02:14 | Edited .kiro/specs/scheduler-core/requirements.md | expanded (+24 lines) | ~570 | +| 02:14 | Edited .kiro/specs/scheduler-core/requirements.md | 8→11 lines | ~249 | +| 02:15 | Edited .kiro/specs/scheduler-core/requirements.md | expanded (+10 lines) | ~382 | +| 02:15 | Edited .kiro/specs/scheduler-core/requirements.md | inline fix | ~95 | +| 02:15 | Session end: 7 writes across 2 files (tasks.md, requirements.md) | 14 reads | ~302164 tok | +| 02:16 | Edited src/controller/config_repl.h | expanded (+13 lines) | ~312 | +| 02:19 | Edited src/controller/config_repl.c | added 1 condition(s) | ~773 | +| 02:19 | Edited src/controller/config_repl.c | modified if() | ~167 | +| 02:19 | Edited src/controller/config_repl.c | modified if() | ~82 | +| 02:19 | Edited src/controller/config_repl.c | reduced (-7 lines) | ~125 | +| 02:20 | Edited src/controller/testsuite/test_config_repl.c | modified 1() | ~864 | +| 02:21 | Edited src/controller/testsuite/test_config_repl.c | 3→5 lines | ~95 | +| 02:43 | Edited .kiro/specs/raft-adapter-conformance/tasks.md | inline fix | ~27 | +| 02:54 | Edited src/controller/cluster.c | modified if() | ~487 | +| 02:54 | Edited src/controller/cluster.c | modified myreq_handler_for_test() | ~263 | +| 03:02 | Edited src/controller/testsuite/test_config_repl.c | modified 2() | ~1415 | +| 03:03 | Edited src/controller/testsuite/test_config_repl.c | 3→5 lines | ~95 | +| 03:08 | Edited src/controller/meson.build | 17→18 lines | ~71 | +| 03:12 | Edited src/controller/testsuite/test_config_repl.c | 4→5 lines | ~30 | +| 03:13 | Edited src/controller/testsuite/test_config_repl.c | modified apiserver_init() | ~516 | +| 03:34 | Edited src/controller/testsuite/test_config_repl.c | expanded (+6 lines) | ~124 | +| 03:35 | Edited src/controller/cluster.c | modified XCE_TESTING() | ~251 | +| 03:40 | Edited src/controller/testsuite/test_config_repl.c | 11→14 lines | ~209 | +| 03:41 | Edited src/controller/cluster.c | expanded (+6 lines) | ~191 | +| 03:44 | Fixed 2 review findings on task 2.2 (myreq_handler_for_test XCE_TESTING guard + false leak) | src/controller/cluster.c, src/controller/testsuite/test_config_repl.c | controller_unit_test 1055/1055 PASS, symbol confirmed absent from xce_controller prod binary via nm | ~2400 | +| 03:56 | Edited .kiro/specs/raft-adapter-conformance/tasks.md | inline fix | ~24 | +| 03:56 | Edited .kiro/specs/raft-adapter-conformance/tasks.md | modified XCE_TESTING() | ~521 | +| 04:35 | Edited src/controller/testsuite/test_config_repl.c | modified 3() | ~3564 | +| 04:35 | Edited src/controller/testsuite/test_config_repl.c | expanded (+8 lines) | ~207 | +| 04:38 | Edited src/controller/config_repl.c | modified if() | ~157 | +| 04:38 | Edited src/controller/config_repl.c | added 1 condition(s) | ~248 | +| 04:44 | Edited src/controller/config_repl.c | modified if() | ~76 | +| 04:44 | Edited src/controller/config_repl.c | reduced (-11 lines) | ~124 | +| 04:57 | Edited src/controller/config_repl.c | modified if() | ~75 | +| 04:57 | Edited src/controller/config_repl.c | 9→7 lines | ~90 | +| 06:13 | Edited .kiro/specs/raft-adapter-conformance/tasks.md | inline fix | ~16 | +| 06:21 | Edited src/controller/testsuite/test_ha_vote_send.c | modified test_post_connect_vote_failure_routes_through_production_tally() | ~994 | +| 06:25 | Edited src/controller/ha.c | 3→7 lines | ~110 | +| 06:25 | Edited src/controller/ha.c | 3→3 lines | ~44 | +| 06:26 | Edited src/controller/ha.c | added 2 condition(s) | ~1318 | +| 06:53 | Edited .kiro/specs/raft-adapter-conformance/tasks.md | inline fix | ~31 | +| 07:01 | Edited src/controller/ha.c | modified XCE_TESTING() | ~186 | +| 07:02 | Edited src/controller/testsuite/test_ha_vote_send.c | modified is() | ~1888 | +| 07:02 | Edited src/controller/testsuite/test_ha_vote_send.c | 3→6 lines | ~86 | +| 07:06 | Edited src/controller/ha.c | pre_vote_reply_dispatch() → TEMP() | ~120 | +| 07:08 | Edited src/controller/ha.c | TEMP() → pre_vote_reply_dispatch() | ~126 | +| 07:13 | Edited src/controller/testsuite/test_ha_vote_send.c | modified stub_prevote_rearm_liveness() | ~262 | +| 07:13 | Edited src/controller/testsuite/test_ha_vote_send.c | modified test_prevote_round_reaches_quorum_decision_via_fast_tally() | ~171 | +| 07:14 | Edited src/controller/testsuite/test_ha_vote_send.c | 5→7 lines | ~63 | +| 07:28 | Edited src/controller/ha.c | modified if() | ~72 | +| 07:38 | Edited .kiro/specs/raft-adapter-conformance/tasks.md | inline fix | ~17 | +| 07:38 | Edited .kiro/specs/raft-adapter-conformance/tasks.md | modified XCE_TESTING() | ~328 | +| 07:44 | Edited src/controller/ha.c | added error handling | ~1214 | +| 07:44 | Edited src/controller/ha.h | modified ha_arm_own_term_gate_for_test() | ~321 | +| 07:44 | Edited src/controller/testsuite/test_ha_core_safety.c | modified test_4_1_send_append_entries_stub_call_count_increments() | ~521 | +| 07:45 | Edited src/controller/testsuite/test_ha_core_safety.c | 2→7 lines | ~127 | +| 07:45 | Edited src/controller/ha.c | modified XCE_TESTING() | ~68 | +| 07:48 | Edited src/controller/ha.c | modified XCE_TESTING() | ~30 | +| 08:03 | Edited .kiro/specs/raft-adapter-conformance/tasks.md | inline fix | ~25 | +| 08:08 | Edited src/controller/testsuite/test_ha_core_safety.c | added error handling | ~1198 | +| 08:09 | Edited src/controller/testsuite/test_ha_core_safety.c | modified 2() | ~157 | +| 08:09 | Edited src/controller/testsuite/test_ha_core_safety.c | modified PROOF() | ~127 | +| 08:18 | Session end: 63 writes across 11 files (tasks.md, requirements.md, config_repl.h, config_repl.c, test_config_repl.c) | 33 reads | ~628973 tok | +| 08:19 | Edited src/controller/testsuite/test_ha_core_safety.c | reduced (-6 lines) | ~36 | +| 08:29 | Edited src/controller/testsuite/test_ha_core_safety.c | 4→7 lines | ~73 | +| 08:34 | Edited .kiro/specs/raft-adapter-conformance/tasks.md | inline fix | ~18 | +| 08:44 | Edited src/controller/testsuite/test_ha_core_safety.c | added error handling | ~1354 | +| 08:44 | Edited src/controller/testsuite/test_ha_core_safety.c | 3→3 lines | ~63 | +| 08:44 | Edited src/controller/testsuite/test_ha_core_safety.c | modified 1() | ~106 | +| 08:48 | Edited src/controller/ha.c | modified EVIDENCE() | ~88 | +| 08:50 | Edited src/controller/ha.c | 7→3 lines | ~21 | +| 08:52 | raft-adapter-conformance task 5.1: added test_5_1_wal_catchup_reject_sends_nack_reply regression-lock (WAL catch-up logOk reject -> ha_send_wal_ack_reply_ex success=0 via ha_wal_ack_send_hook); RED confirmed via temp ha.c revert (1066 Tests 2 Failures, incl. pre-existing test_bug1479_ae_reject_sends_nack_not_silence which covers the same boundary in test_config_repl.c), reverted, GREEN confirmed (1066 Tests 0 Failures) | src/controller/testsuite/test_ha_core_safety.c | READY_FOR_REVIEW | ~9200 | +| 09:04 | Edited src/controller/ha.c | 3→3 lines | ~27 | +| 09:07 | Edited src/controller/ha.c | 3→3 lines | ~21 | +| 09:11 | Edited .kiro/specs/raft-adapter-conformance/tasks.md | inline fix | ~23 | +| 19:28 | Session end: 74 writes across 11 files (tasks.md, requirements.md, config_repl.h, config_repl.c, test_config_repl.c) | 33 reads | ~635066 tok | +| 19:31 | Edited .kiro/specs/scheduler-core/requirements.md | modified check_breakpoints() | ~1596 | +| 19:32 | Edited .kiro/specs/scheduler-core/requirements.md | inline fix | ~384 | +| 19:32 | Edited .kiro/specs/scheduler-core/requirements.md | 10→11 lines | ~287 | +| 19:33 | Edited .kiro/specs/scheduler-core/requirements.md | inline fix | ~139 | +| 19:33 | Edited .kiro/specs/scheduler-core/requirements.md | "--sim-pause-at NS" → "--interactive" | ~21 | +| 19:34 | Edited .kiro/specs/scheduler-core/requirements.md | "--sim-pause-at TIMESTAMP" → "--interactive" | ~35 | +| 19:35 | Session end: 80 writes across 11 files (tasks.md, requirements.md, config_repl.h, config_repl.c, test_config_repl.c) | 33 reads | ~639287 tok | +| 19:36 | Edited .kiro/specs/scheduler-core/requirements.md | expanded (+11 lines) | ~485 | +| 19:37 | Edited .kiro/specs/scheduler-core/requirements.md | modified check_breakpoints() | ~326 | +| 19:37 | Edited .kiro/specs/scheduler-core/requirements.md | 2→2 lines | ~112 | +| 19:38 | Edited .kiro/specs/scheduler-core/requirements.md | inline fix | ~86 | +| 19:38 | Session end: 84 writes across 11 files (tasks.md, requirements.md, config_repl.h, config_repl.c, test_config_repl.c) | 34 reads | ~682021 tok | +| 19:42 | Edited .kiro/specs/scheduler-core/requirements.md | 2→2 lines | ~43 | +| 19:42 | Session end: 85 writes across 11 files (tasks.md, requirements.md, config_repl.h, config_repl.c, test_config_repl.c) | 34 reads | ~682130 tok | +| 19:51 | Edited src/controller/testsuite/test_commit_barrier_reply.c | 4→5 lines | ~27 | +| 19:52 | Edited src/controller/testsuite/test_commit_barrier_reply.c | added 2 condition(s) | ~1777 | +| 19:52 | Edited src/controller/testsuite/test_commit_barrier_reply.c | 2→5 lines | ~68 | +| 19:55 | Edited src/controller/testsuite/test_commit_barrier_reply.c | added 2 condition(s) | ~557 | +| 19:56 | Edited src/controller/testsuite/test_commit_barrier_reply.c | 10→13 lines | ~219 | +| 19:56 | Edited src/controller/testsuite/test_commit_barrier_reply.c | modified already() | ~132 | +| 19:57 | Edited src/controller/persist.c | modified REGRESSION() | ~221 | +| 20:00 | Edited src/controller/persist.c | modified if() | ~144 | +| 20:13 | Edited src/controller/persist.c | modified if() | ~133 | +| 20:15 | Edited src/controller/persist.c | modified if() | ~130 | +| 20:16 | Session end: 95 writes across 13 files (tasks.md, requirements.md, config_repl.h, config_repl.c, test_config_repl.c) | 35 reads | ~687580 tok | +| 20:20 | Edited .kiro/specs/raft-adapter-conformance/tasks.md | inline fix | ~26 | +| 20:22 | Edited .kiro/specs/scheduler-core/requirements.md | 1→2 lines | ~163 | +| 20:23 | Edited .kiro/specs/scheduler-core/requirements.md | modified struct() | ~108 | +| 20:23 | Session end: 98 writes across 13 files (tasks.md, requirements.md, config_repl.h, config_repl.c, test_config_repl.c) | 38 reads | ~698681 tok | +| 20:27 | Session end: 98 writes across 13 files (tasks.md, requirements.md, config_repl.h, config_repl.c, test_config_repl.c) | 38 reads | ~698681 tok | +| 20:29 | Edited src/controller/CLAUDE.md | added error handling | ~1011 | +| 20:29 | Session end: 99 writes across 14 files (tasks.md, requirements.md, config_repl.h, config_repl.c, test_config_repl.c) | 38 reads | ~699764 tok | +| 20:29 | Edited src/controller/CLAUDE.md | added error handling | ~323 | +| 20:29 | Edited .kiro/specs/ha-term-safety/spec.json | inline fix | ~261 | +| 20:30 | Edited .kiro/specs/scheduler-core/requirements.md | inline fix | ~427 | +| 20:32 | Edited .kiro/specs/scheduler-core/requirements.md | expanded (+77 lines) | ~2402 | +| 20:32 | Edited .kiro/specs/scheduler-core/requirements.md | inline fix | ~15 | +| 20:32 | Edited .kiro/specs/scheduler-core/requirements.md | inline fix | ~22 | +| 20:32 | Edited .kiro/specs/scheduler-core/requirements.md | "diff" → "xceadmin scheduler dump" | ~148 | +| 20:33 | Edited .kiro/specs/scheduler-core/requirements.md | 25→28 lines | ~443 | +| 20:33 | Edited .kiro/specs/scheduler-core/requirements.md | modified while() | ~264 | +| 20:33 | Edited .kiro/specs/scheduler-core/requirements.md | reduced (-6 lines) | ~127 | +| 20:33 | Edited .kiro/specs/scheduler-core/requirements.md | 22→23 lines | ~280 | +| 20:34 | Edited .kiro/specs/scheduler-core/requirements.md | inline fix | ~91 | +| 20:34 | Edited .kiro/specs/scheduler-core/requirements.md | added 1 condition(s) | ~502 | +| 20:34 | Edited .kiro/specs/scheduler-core/requirements.md | 3→3 lines | ~200 | +| 20:35 | Edited .kiro/specs/scheduler-core/requirements.md | 22→22 lines | ~699 | +| 20:35 | Edited .kiro/specs/scheduler-core/requirements.md | inline fix | ~110 | +| 20:35 | Edited .kiro/specs/scheduler-core/requirements.md | inline fix | ~80 | +| 20:35 | Edited .kiro/specs/scheduler-core/requirements.md | 4→4 lines | ~44 | +| 20:36 | Edited .kiro/specs/scheduler-core/requirements.md | inline fix | ~41 | +| 20:36 | Edited .kiro/specs/scheduler-core/requirements.md | inline fix | ~115 | +| 20:36 | Session end: 119 writes across 15 files (tasks.md, requirements.md, config_repl.h, config_repl.c, test_config_repl.c) | 38 reads | ~706904 tok | +| 20:39 | Edited .kiro/specs/raft-adapter-conformance/tasks.md | inline fix | ~27 | +| 20:58 | Edited .kiro/specs/raft-adapter-conformance/tasks.md | inline fix | ~22 | +| 20:58 | Edited .kiro/specs/scheduler-core/requirements.md | inline fix | ~18 | +| 20:59 | Session end: 122 writes across 15 files (tasks.md, requirements.md, config_repl.h, config_repl.c, test_config_repl.c) | 38 reads | ~708405 tok | +| 21:24 | Session end: 122 writes across 15 files (tasks.md, requirements.md, config_repl.h, config_repl.c, test_config_repl.c) | 42 reads | ~712183 tok | +| 21:25 | Edited .kiro/specs/raft-adapter-conformance/tasks.md | inline fix | ~25 | +| 21:26 | Edited .kiro/specs/raft-adapter-conformance/tasks.md | modified 2() | ~312 | +| 21:27 | Edited .kiro/specs/scheduler-core/requirements.md | 7→8 lines | ~100 | +| 21:28 | Edited .kiro/specs/scheduler-core/requirements.md | 2→2 lines | ~56 | +| 21:28 | Edited .kiro/specs/scheduler-core/requirements.md | inline fix | ~48 | +| 21:28 | Edited .kiro/specs/scheduler-core/requirements.md | inline fix | ~97 | +| 21:28 | Edited .kiro/specs/scheduler-core/requirements.md | inline fix | ~88 | +| 21:29 | Edited .kiro/specs/scheduler-core/requirements.md | inline fix | ~43 | +| 21:29 | Edited .kiro/specs/scheduler-core/requirements.md | "BEGIN_ROUND" → "ReplaySession" | ~77 | +| 21:29 | Edited .kiro/specs/scheduler-core/requirements.md | write_decision_line() → write_replay_decision() | ~219 | +| 21:30 | Edited .kiro/specs/scheduler-core/requirements.md | 4→4 lines | ~98 | +| 21:31 | Edited .kiro/specs/scheduler-core/requirements.md | inline fix | ~26 | +| 21:31 | Session end: 134 writes across 15 files (tasks.md, requirements.md, config_repl.h, config_repl.c, test_config_repl.c) | 44 reads | ~725449 tok | +| 21:45 | Created ../../../../../../tmp/claude-1000/-home-rshen-projects-xce-worktrees-config/d6d1f70d-af0b-465b-9cd6-e719e38692ce/scratchpad/configpush_baddriver.c | — | ~847 | +| 22:29 | Created ../../../../../../tmp/claude-1000/-home-rshen-projects-xce-worktrees-config/d6d1f70d-af0b-465b-9cd6-e719e38692ce/scratchpad/ha-configpush-replydecode/reject_reply_decode_driver.py | — | ~964 | +| 22:39 | Created ../../../../../../tmp/claude-1000/-home-rshen-projects-xce-worktrees-config/d6d1f70d-af0b-465b-9cd6-e719e38692ce/scratchpad/ha-configpush-replydecode/reject_reply_decode_driver.py | — | ~1375 | +| 22:47 | Edited .kiro/specs/raft-adapter-conformance/tasks.md | inline fix | ~16 | +| 22:48 | Edited .kiro/specs/raft-adapter-conformance/tasks.md | modified 2() | ~409 | +| 23:33 | Edited .kiro/specs/scheduler-core/requirements.md | expanded (+13 lines) | ~741 | +| 23:34 | Edited .kiro/specs/scheduler-core/requirements.md | "xceadmin scheduler dump" → "diff <(xceadmin scheduler" | ~171 | +| 23:35 | Edited .kiro/specs/scheduler-core/requirements.md | inline fix | ~46 | +| 23:35 | Session end: 142 writes across 17 files (tasks.md, requirements.md, config_repl.h, config_repl.c, test_config_repl.c) | 48 reads | ~737546 tok | +| 23:39 | Edited .kiro/specs/scheduler-core/requirements.md | modified is() | ~554 | +| 23:39 | Session end: 143 writes across 17 files (tasks.md, requirements.md, config_repl.h, config_repl.c, test_config_repl.c) | 48 reads | ~738168 tok | +| 00:05 | Created ../../../../../claude/.claude/projects/-home-rshen-projects-xce-xce/memory/project_scheduler_core_design_invariant.md | — | ~403 | +| 00:06 | Edited ../../../../../claude/.claude/projects/-home-rshen-projects-xce-xce/memory/MEMORY.md | 3→4 lines | ~103 | +| 00:07 | Edited .kiro/specs/scheduler-core/requirements.md | inline fix | ~237 | +| 00:08 | Edited .kiro/specs/scheduler-core/requirements.md | inline fix | ~21 | +| 00:08 | Session end: 147 writes across 19 files (tasks.md, requirements.md, config_repl.h, config_repl.c, test_config_repl.c) | 49 reads | ~739223 tok | +| 00:35 | Created ../../../../../../tmp/claude-1000/-home-rshen-projects-xce-worktrees-config/d6d1f70d-af0b-465b-9cd6-e719e38692ce/scratchpad/ha-vote-postconnect/impostor_peer.py | — | ~584 | +| 00:54 | Created ../../../../../../tmp/claude-1000/-home-rshen-projects-xce-worktrees-config/d6d1f70d-af0b-465b-9cd6-e719e38692ce/scratchpad/impostor.py | — | ~207 | +| 01:00 | Edited .kiro/specs/raft-adapter-conformance/tasks.md | inline fix | ~43 | +| 01:01 | Edited .kiro/specs/raft-adapter-conformance/tasks.md | 1→3 lines | ~554 | +| 01:14 | Session end: 151 writes across 21 files (tasks.md, requirements.md, config_repl.h, config_repl.c, test_config_repl.c) | 49 reads | ~741182 tok | +| 01:16 | Session end: 151 writes across 21 files (tasks.md, requirements.md, config_repl.h, config_repl.c, test_config_repl.c) | 49 reads | ~741182 tok | +| 01:29 | Created src/docs/deployment.md | — | ~4666 | +| 01:29 | Session end: 152 writes across 22 files (tasks.md, requirements.md, config_repl.h, config_repl.c, test_config_repl.c) | 102 reads | ~813030 tok | + +## Session: 2026-07-30 01:48 + +| Time | Action | File(s) | Outcome | ~Tokens | +|------|--------|---------|---------|--------| +| 01:48 | Edited src/docs/deployment.md | 4→4 lines | ~397 | +| 01:48 | Edited src/docs/deployment.md | inline fix | ~67 | +| 01:49 | Edited src/frontend/apiserver/config/auth.yaml | 3→3 lines | ~25 | +| 01:49 | Edited src/docs/deployment.md | inline fix | ~92 | +| 01:49 | Session end: 4 writes across 2 files (deployment.md, auth.yaml) | 2 reads | ~4994 tok | +| 02:01 | Edited .kiro/specs/admin-config-tool/tasks.md | expanded (+17 lines) | ~704 | +| 02:02 | Edited .kiro/specs/admin-config-tool/spec.json | 3→3 lines | ~26 | +| 02:02 | Session end: 6 writes across 4 files (deployment.md, auth.yaml, tasks.md, spec.json) | 3 reads | ~11767 tok | +| 02:09 | Edited .kiro/specs/admin-config-tool/tasks.md | 8→9 lines | ~524 | +| 02:20 | Created ../../../../../../tmp/claude-1000/-home-rshen-projects-xce-worktrees-config/d6d1f70d-af0b-465b-9cd6-e719e38692ce/scratchpad/verify_envelope.py | — | ~937 | +| 02:22 | Created ../../../../../../tmp/claude-1000/-home-rshen-projects-xce-worktrees-config/d6d1f70d-af0b-465b-9cd6-e719e38692ce/scratchpad/verify_decode_reply.py | — | ~783 | +| 02:23 | Edited src/xceadmin/src/xceadmin/discovery.py | modified decode_reply() | ~1218 | +| 02:23 | Edited src/xceadmin/src/xceadmin/push.py | 4→4 lines | ~50 | +| 02:23 | Edited src/xceadmin/src/xceadmin/push.py | from_bytes() → decode_reply() | ~195 | +| 02:24 | Edited src/xceadmin/tests/conftest.py | added 1 import(s) | ~77 | +| 02:24 | Edited src/xceadmin/tests/conftest.py | modified wrap_reply() | ~308 | +| 02:24 | Edited src/xceadmin/tests/test_discovery.py | modified _reply_bytes() | ~345 | +| 02:25 | Edited src/xceadmin/tests/test_discovery.py | 7→8 lines | ~88 | +| 02:25 | Edited src/xceadmin/tests/test_discovery.py | 4→3 lines | ~36 | +| 02:26 | Edited src/xceadmin/tests/test_discovery.py | modified send_fn() | ~865 | +| 02:26 | Edited src/xceadmin/tests/test_config_push_mock.py | to_bytes() → wrap_reply() | ~239 | +| 02:26 | Edited src/xceadmin/tests/test_config_push_mock.py | to_bytes() → wrap_reply() | ~246 | +| 02:27 | Edited src/xceadmin/tests/test_config_push_mock.py | modified test_push_config_non_zero_status_reports_error_not_exception() | ~592 | +| 02:27 | Edited src/xceadmin/tests/test_config_push_mock.py | to_bytes() → wrap_reply() | ~218 | +| 02:31 | Edited src/xceadmin/tests/test_cli.py | to_bytes() → wrap_reply() | ~150 | +| 02:31 | Edited src/xceadmin/tests/test_cli.py | to_bytes() → wrap_reply() | ~156 | +| 02:32 | Fixed task 6.1: decode_reply() unwraps Request{body.replymsg} envelope before treating bytes as RequestReply in discovery.py/push.py; updated 4 test files mock fixtures to real wire shape | src/xceadmin/src/xceadmin/discovery.py, src/xceadmin/src/xceadmin/push.py, src/xceadmin/tests/{conftest,test_discovery,test_config_push_mock,test_cli}.py | 172/172 tests pass, RED (17 fail)->GREEN via xce-build.sh xceadmin | ~1200 +| 02:43 | Edited .kiro/specs/admin-config-tool/tasks.md | 2→2 lines | ~39 | +| 02:43 | Edited .kiro/specs/admin-config-tool/tasks.md | 1→3 lines | ~303 | +| 03:00 | Created src/xceadmin/tests/test_e2e_live_push.py | — | ~2889 | +| 03:01 | Edited src/xceadmin/tests/test_e2e_live_push.py | modified probe() | ~92 | +| 03:03 | Edited src/xceadmin/tests/test_e2e_live_push.py | modified live_controller() | ~838 | +| 03:20 | Edited .kiro/specs/admin-config-tool/tasks.md | inline fix | ~16 | +| 03:20 | Edited .kiro/specs/admin-config-tool/tasks.md | 1→2 lines | ~353 | +| 03:21 | Session end: 31 writes across 13 files (deployment.md, auth.yaml, tasks.md, spec.json, verify_envelope.py) | 25 reads | ~237114 tok | +| 03:25 | Edited .kiro/specs/admin-config-tool/tasks.md | expanded (+10 lines) | ~545 | +| 03:25 | Session end: 32 writes across 13 files (deployment.md, auth.yaml, tasks.md, spec.json, verify_envelope.py) | 25 reads | ~237698 tok | +| 04:05 | Session end: 32 writes across 13 files (deployment.md, auth.yaml, tasks.md, spec.json, verify_envelope.py) | 25 reads | ~237698 tok | + +## Session: 2026-07-30 04:09 + +| Time | Action | File(s) | Outcome | ~Tokens | +|------|--------|---------|---------|--------| +| 06:08 | Created src/xceadmin/tests/_live_e2e_common.py | — | ~1206 | +| 06:08 | Edited src/xceadmin/tests/test_e2e_live_push.py | reduced (-40 lines) | ~150 | +| 06:09 | Edited src/xceadmin/tests/test_e2e_live_push.py | added 6 import(s) | ~154 | +| 06:13 | Created src/xceadmin/tests/test_e2e_live_ha_push.py | — | ~4314 | +| 06:20 | Created ../../../../../../tmp/claude-1000/-home-rshen-projects-xce-worktrees-config/d6d1f70d-af0b-465b-9cd6-e719e38692ce/scratchpad/manual_ha_deploy.sh | — | ~381 | +| 06:31 | Edited src/xceadmin/tests/test_e2e_live_ha_push.py | modified cluster() | ~1089 | +| 06:32 | Edited src/xceadmin/tests/test_e2e_live_ha_push.py | expanded (+9 lines) | ~288 | +| 06:32 | Edited src/xceadmin/tests/test_e2e_live_ha_push.py | modified test_live_config_push_against_standby_returns_standby_rejection_not_redirect() | ~1084 | +| 06:59 | Edited src/xceadmin/tests/test_e2e_live_ha_push.py | modified wait() | ~865 | +| 06:59 | Edited src/xceadmin/tests/test_e2e_live_ha_push.py | expanded (+6 lines) | ~131 | +| 06:59 | Edited src/xceadmin/tests/test_e2e_live_ha_push.py | modified _wait_for_standbys() | ~424 | +| 06:59 | Edited src/xceadmin/tests/test_e2e_live_ha_push.py | modified recheck() | ~255 | +| 07:10 | Edited src/xceadmin/tests/test_e2e_live_ha_push.py | 10→11 lines | ~110 | +| 07:10 | Edited src/xceadmin/tests/test_e2e_live_ha_push.py | added 1 import(s) | ~29 | +| 07:19 | Session end: 14 writes across 4 files (_live_e2e_common.py, test_e2e_live_push.py, test_e2e_live_ha_push.py, manual_ha_deploy.sh) | 16 reads | ~183555 tok | +| 07:23 | Session end: 14 writes across 4 files (_live_e2e_common.py, test_e2e_live_push.py, test_e2e_live_ha_push.py, manual_ha_deploy.sh) | 16 reads | ~183555 tok | +| 07:27 | Edited src/xceadmin/tests/test_e2e_live_ha_push.py | 11→10 lines | ~91 | +| 07:27 | Edited src/xceadmin/tests/test_e2e_live_ha_push.py | 7→6 lines | ~26 | +| 14:35 | Round-2 remediation task 6.3: added _wait_for_standbys + settle delay + port recheck to live_ha_cluster fixture (test-heartbeat-tolerance.sh parity) | src/xceadmin/tests/test_e2e_live_ha_push.py | did NOT fix flake -- discovered primary process crashes silently right after CTRL_PRIMARY promotion (zombie proc, log truncates, stderr empty); reported BLOCKED, not a test-side-fixable race | ~large | +| 07:38 | Created src/xceadmin/tests/test_repro_bug1485.py | — | ~1910 | +| 07:54 | Session end: 17 writes across 5 files (_live_e2e_common.py, test_e2e_live_push.py, test_e2e_live_ha_push.py, manual_ha_deploy.sh, test_repro_bug1485.py) | 18 reads | ~187304 tok | +| 07:55 | Session end: 17 writes across 5 files (_live_e2e_common.py, test_e2e_live_push.py, test_e2e_live_ha_push.py, manual_ha_deploy.sh, test_repro_bug1485.py) | 18 reads | ~187304 tok | +| 07:57 | Edited .kiro/specs/admin-config-tool/tasks.md | 5→6 lines | ~377 | +| 07:57 | Session end: 18 writes across 6 files (_live_e2e_common.py, test_e2e_live_push.py, test_e2e_live_ha_push.py, manual_ha_deploy.sh, test_repro_bug1485.py) | 18 reads | ~187708 tok | +| 08:02 | Session end: 18 writes across 6 files (_live_e2e_common.py, test_e2e_live_push.py, test_e2e_live_ha_push.py, manual_ha_deploy.sh, test_repro_bug1485.py) | 18 reads | ~187708 tok | +| 20:33 | Session end: 18 writes across 6 files (_live_e2e_common.py, test_e2e_live_push.py, test_e2e_live_ha_push.py, manual_ha_deploy.sh, test_repro_bug1485.py) | 18 reads | ~187708 tok | +| 20:40 | Session end: 18 writes across 6 files (_live_e2e_common.py, test_e2e_live_push.py, test_e2e_live_ha_push.py, manual_ha_deploy.sh, test_repro_bug1485.py) | 19 reads | ~187708 tok | +| 20:44 | Session end: 18 writes across 6 files (_live_e2e_common.py, test_e2e_live_push.py, test_e2e_live_ha_push.py, manual_ha_deploy.sh, test_repro_bug1485.py) | 19 reads | ~187708 tok | +| 20:50 | Session end: 18 writes across 6 files (_live_e2e_common.py, test_e2e_live_push.py, test_e2e_live_ha_push.py, manual_ha_deploy.sh, test_repro_bug1485.py) | 19 reads | ~187708 tok | +| 03:48 | `/xce-build all` (asan) requested for full ASAN rebuild of lib/controller/scheduler/worker/apiserver/xcecli/xceadmin; discovered 2 OTHER concurrent Claude sessions independently running xce-build.sh against the same shared xce.build dir (torn out my first backgrounded run mid-flight via bug-1464's unconditional rm -rf, no error/silent stop at [360/362]); waited for both peers to exit (bounded poll, not passive background-notify), then ran one clean blocking `all` build myself | src/xce.build/controller/{xce_controller,xce_test,controller_unit_test}, src/xce.build/scheduler/xce_scheduler, src/xce.build/worker/{xcecd,xcecd_worker,xcecd_virtual,xrun}, src/xce.build/frontend/{apiserver/xce_apiserver,xcecli/xcecli}, src/xce.build/xceadmin/.venv/bin/xceadmin, src/xce.build/lib/libxce.a | PASS exit 0: meson Ok:9 Fail:0, scheduler Unity 15/15, xceadmin pytest 172 passed/3 skipped, Go tests(apiserver+xcecli) all ok, 149 pre-existing benign unused-var/fn warnings only, zero errors; all binaries mtime 03:46-03:47 | ~35k | +| 20:52 | Session end: 18 writes across 6 files (_live_e2e_common.py, test_e2e_live_push.py, test_e2e_live_ha_push.py, manual_ha_deploy.sh, test_repro_bug1485.py) | 21 reads | ~199346 tok | +| 20:54 | Session end: 18 writes across 6 files (_live_e2e_common.py, test_e2e_live_push.py, test_e2e_live_ha_push.py, manual_ha_deploy.sh, test_repro_bug1485.py) | 21 reads | ~199346 tok | +| 21:10 | Edited .claude/skills/xce-test-ha/run-ha-soak.sh | modified probe_primary() | ~127 | +| 21:30 | Session end: 19 writes across 7 files (_live_e2e_common.py, test_e2e_live_push.py, test_e2e_live_ha_push.py, manual_ha_deploy.sh, test_repro_bug1485.py) | 22 reads | ~199482 tok | +| 21:31 | Session end: 19 writes across 7 files (_live_e2e_common.py, test_e2e_live_push.py, test_e2e_live_ha_push.py, manual_ha_deploy.sh, test_repro_bug1485.py) | 22 reads | ~199482 tok | +| 21:32 | Session end: 19 writes across 7 files (_live_e2e_common.py, test_e2e_live_push.py, test_e2e_live_ha_push.py, manual_ha_deploy.sh, test_repro_bug1485.py) | 22 reads | ~199482 tok | +| 21:32 | Session end: 19 writes across 7 files (_live_e2e_common.py, test_e2e_live_push.py, test_e2e_live_ha_push.py, manual_ha_deploy.sh, test_repro_bug1485.py) | 22 reads | ~199482 tok | +| 21:33 | Session end: 19 writes across 7 files (_live_e2e_common.py, test_e2e_live_push.py, test_e2e_live_ha_push.py, manual_ha_deploy.sh, test_repro_bug1485.py) | 22 reads | ~199482 tok | +| 21:34 | Session end: 19 writes across 7 files (_live_e2e_common.py, test_e2e_live_push.py, test_e2e_live_ha_push.py, manual_ha_deploy.sh, test_repro_bug1485.py) | 22 reads | ~199482 tok | +| 21:34 | Session end: 19 writes across 7 files (_live_e2e_common.py, test_e2e_live_push.py, test_e2e_live_ha_push.py, manual_ha_deploy.sh, test_repro_bug1485.py) | 22 reads | ~199482 tok | +| 21:35 | Session end: 19 writes across 7 files (_live_e2e_common.py, test_e2e_live_push.py, test_e2e_live_ha_push.py, manual_ha_deploy.sh, test_repro_bug1485.py) | 22 reads | ~199482 tok | +| 21:36 | Session end: 19 writes across 7 files (_live_e2e_common.py, test_e2e_live_push.py, test_e2e_live_ha_push.py, manual_ha_deploy.sh, test_repro_bug1485.py) | 22 reads | ~199482 tok | +| 21:36 | Session end: 19 writes across 7 files (_live_e2e_common.py, test_e2e_live_push.py, test_e2e_live_ha_push.py, manual_ha_deploy.sh, test_repro_bug1485.py) | 22 reads | ~199482 tok | +| 21:37 | Session end: 19 writes across 7 files (_live_e2e_common.py, test_e2e_live_push.py, test_e2e_live_ha_push.py, manual_ha_deploy.sh, test_repro_bug1485.py) | 22 reads | ~199482 tok | +| 21:38 | Session end: 19 writes across 7 files (_live_e2e_common.py, test_e2e_live_push.py, test_e2e_live_ha_push.py, manual_ha_deploy.sh, test_repro_bug1485.py) | 22 reads | ~199482 tok | +| 21:38 | Session end: 19 writes across 7 files (_live_e2e_common.py, test_e2e_live_push.py, test_e2e_live_ha_push.py, manual_ha_deploy.sh, test_repro_bug1485.py) | 22 reads | ~199482 tok | +| 21:39 | Session end: 19 writes across 7 files (_live_e2e_common.py, test_e2e_live_push.py, test_e2e_live_ha_push.py, manual_ha_deploy.sh, test_repro_bug1485.py) | 22 reads | ~199482 tok | +| 21:40 | Session end: 19 writes across 7 files (_live_e2e_common.py, test_e2e_live_push.py, test_e2e_live_ha_push.py, manual_ha_deploy.sh, test_repro_bug1485.py) | 22 reads | ~199482 tok | +| 21:41 | Session end: 19 writes across 7 files (_live_e2e_common.py, test_e2e_live_push.py, test_e2e_live_ha_push.py, manual_ha_deploy.sh, test_repro_bug1485.py) | 22 reads | ~199482 tok | +| 21:54 | Session end: 19 writes across 7 files (_live_e2e_common.py, test_e2e_live_push.py, test_e2e_live_ha_push.py, manual_ha_deploy.sh, test_repro_bug1485.py) | 24 reads | ~240492 tok | +| 22:03 | Edited .claude/skills/xce-test-ha/run-ha-soak.sh | added error handling | ~1182 | +| 22:06 | Edited .claude/skills/xce-test-ha/run-ha-soak.sh | 6→3 lines | ~64 | +| 22:08 | Session end: 21 writes across 7 files (_live_e2e_common.py, test_e2e_live_push.py, test_e2e_live_ha_push.py, manual_ha_deploy.sh, test_repro_bug1485.py) | 26 reads | ~266773 tok | +| 22:17 | Session end: 21 writes across 7 files (_live_e2e_common.py, test_e2e_live_push.py, test_e2e_live_ha_push.py, manual_ha_deploy.sh, test_repro_bug1485.py) | 26 reads | ~266773 tok | +| 23:38 | Session end: 21 writes across 7 files (_live_e2e_common.py, test_e2e_live_push.py, test_e2e_live_ha_push.py, manual_ha_deploy.sh, test_repro_bug1485.py) | 26 reads | ~266773 tok | +| 23:39 | Session end: 21 writes across 7 files (_live_e2e_common.py, test_e2e_live_push.py, test_e2e_live_ha_push.py, manual_ha_deploy.sh, test_repro_bug1485.py) | 26 reads | ~266773 tok | +| 23:39 | Session end: 21 writes across 7 files (_live_e2e_common.py, test_e2e_live_push.py, test_e2e_live_ha_push.py, manual_ha_deploy.sh, test_repro_bug1485.py) | 26 reads | ~266773 tok | +| 23:40 | Session end: 21 writes across 7 files (_live_e2e_common.py, test_e2e_live_push.py, test_e2e_live_ha_push.py, manual_ha_deploy.sh, test_repro_bug1485.py) | 26 reads | ~266773 tok | +| 23:41 | Session end: 21 writes across 7 files (_live_e2e_common.py, test_e2e_live_push.py, test_e2e_live_ha_push.py, manual_ha_deploy.sh, test_repro_bug1485.py) | 26 reads | ~266773 tok | +| 23:41 | Session end: 21 writes across 7 files (_live_e2e_common.py, test_e2e_live_push.py, test_e2e_live_ha_push.py, manual_ha_deploy.sh, test_repro_bug1485.py) | 26 reads | ~266773 tok | +| 23:42 | Session end: 21 writes across 7 files (_live_e2e_common.py, test_e2e_live_push.py, test_e2e_live_ha_push.py, manual_ha_deploy.sh, test_repro_bug1485.py) | 26 reads | ~266773 tok | +| 23:43 | Session end: 21 writes across 7 files (_live_e2e_common.py, test_e2e_live_push.py, test_e2e_live_ha_push.py, manual_ha_deploy.sh, test_repro_bug1485.py) | 26 reads | ~266773 tok | +| 23:43 | Session end: 21 writes across 7 files (_live_e2e_common.py, test_e2e_live_push.py, test_e2e_live_ha_push.py, manual_ha_deploy.sh, test_repro_bug1485.py) | 26 reads | ~266773 tok | +| 23:44 | Session end: 21 writes across 7 files (_live_e2e_common.py, test_e2e_live_push.py, test_e2e_live_ha_push.py, manual_ha_deploy.sh, test_repro_bug1485.py) | 26 reads | ~266773 tok | +| 23:45 | Session end: 21 writes across 7 files (_live_e2e_common.py, test_e2e_live_push.py, test_e2e_live_ha_push.py, manual_ha_deploy.sh, test_repro_bug1485.py) | 26 reads | ~266773 tok | +| 23:46 | Session end: 21 writes across 7 files (_live_e2e_common.py, test_e2e_live_push.py, test_e2e_live_ha_push.py, manual_ha_deploy.sh, test_repro_bug1485.py) | 26 reads | ~266773 tok | +| 23:46 | Session end: 21 writes across 7 files (_live_e2e_common.py, test_e2e_live_push.py, test_e2e_live_ha_push.py, manual_ha_deploy.sh, test_repro_bug1485.py) | 26 reads | ~266773 tok | +| 23:47 | Session end: 21 writes across 7 files (_live_e2e_common.py, test_e2e_live_push.py, test_e2e_live_ha_push.py, manual_ha_deploy.sh, test_repro_bug1485.py) | 26 reads | ~266773 tok | +| 23:48 | Session end: 21 writes across 7 files (_live_e2e_common.py, test_e2e_live_push.py, test_e2e_live_ha_push.py, manual_ha_deploy.sh, test_repro_bug1485.py) | 26 reads | ~266773 tok | +| 23:48 | Session end: 21 writes across 7 files (_live_e2e_common.py, test_e2e_live_push.py, test_e2e_live_ha_push.py, manual_ha_deploy.sh, test_repro_bug1485.py) | 26 reads | ~266773 tok | +| 23:49 | Session end: 21 writes across 7 files (_live_e2e_common.py, test_e2e_live_push.py, test_e2e_live_ha_push.py, manual_ha_deploy.sh, test_repro_bug1485.py) | 26 reads | ~266773 tok | +| 23:50 | Session end: 21 writes across 7 files (_live_e2e_common.py, test_e2e_live_push.py, test_e2e_live_ha_push.py, manual_ha_deploy.sh, test_repro_bug1485.py) | 26 reads | ~266773 tok | +| 23:50 | Session end: 21 writes across 7 files (_live_e2e_common.py, test_e2e_live_push.py, test_e2e_live_ha_push.py, manual_ha_deploy.sh, test_repro_bug1485.py) | 26 reads | ~266773 tok | +| 23:51 | Session end: 21 writes across 7 files (_live_e2e_common.py, test_e2e_live_push.py, test_e2e_live_ha_push.py, manual_ha_deploy.sh, test_repro_bug1485.py) | 26 reads | ~266773 tok | +| 00:13 | Session end: 21 writes across 7 files (_live_e2e_common.py, test_e2e_live_push.py, test_e2e_live_ha_push.py, manual_ha_deploy.sh, test_repro_bug1485.py) | 26 reads | ~266773 tok | +| 00:14 | Session end: 21 writes across 7 files (_live_e2e_common.py, test_e2e_live_push.py, test_e2e_live_ha_push.py, manual_ha_deploy.sh, test_repro_bug1485.py) | 26 reads | ~266773 tok | +| 00:14 | Session end: 21 writes across 7 files (_live_e2e_common.py, test_e2e_live_push.py, test_e2e_live_ha_push.py, manual_ha_deploy.sh, test_repro_bug1485.py) | 26 reads | ~266773 tok | +| 00:15 | Session end: 21 writes across 7 files (_live_e2e_common.py, test_e2e_live_push.py, test_e2e_live_ha_push.py, manual_ha_deploy.sh, test_repro_bug1485.py) | 26 reads | ~266773 tok | +| 00:16 | Session end: 21 writes across 7 files (_live_e2e_common.py, test_e2e_live_push.py, test_e2e_live_ha_push.py, manual_ha_deploy.sh, test_repro_bug1485.py) | 26 reads | ~266773 tok | +| 00:17 | Session end: 21 writes across 7 files (_live_e2e_common.py, test_e2e_live_push.py, test_e2e_live_ha_push.py, manual_ha_deploy.sh, test_repro_bug1485.py) | 26 reads | ~266773 tok | +| 00:18 | Session end: 21 writes across 7 files (_live_e2e_common.py, test_e2e_live_push.py, test_e2e_live_ha_push.py, manual_ha_deploy.sh, test_repro_bug1485.py) | 26 reads | ~266773 tok | +| 00:19 | Session end: 21 writes across 7 files (_live_e2e_common.py, test_e2e_live_push.py, test_e2e_live_ha_push.py, manual_ha_deploy.sh, test_repro_bug1485.py) | 26 reads | ~266773 tok | +| 00:20 | Session end: 21 writes across 7 files (_live_e2e_common.py, test_e2e_live_push.py, test_e2e_live_ha_push.py, manual_ha_deploy.sh, test_repro_bug1485.py) | 26 reads | ~266773 tok | +| 00:21 | Session end: 21 writes across 7 files (_live_e2e_common.py, test_e2e_live_push.py, test_e2e_live_ha_push.py, manual_ha_deploy.sh, test_repro_bug1485.py) | 26 reads | ~266773 tok | +| 00:23 | Session end: 21 writes across 7 files (_live_e2e_common.py, test_e2e_live_push.py, test_e2e_live_ha_push.py, manual_ha_deploy.sh, test_repro_bug1485.py) | 26 reads | ~266773 tok | +| 01:09 | Session end: 21 writes across 7 files (_live_e2e_common.py, test_e2e_live_push.py, test_e2e_live_ha_push.py, manual_ha_deploy.sh, test_repro_bug1485.py) | 26 reads | ~266773 tok | +| 01:22 | Session end: 21 writes across 7 files (_live_e2e_common.py, test_e2e_live_push.py, test_e2e_live_ha_push.py, manual_ha_deploy.sh, test_repro_bug1485.py) | 26 reads | ~266773 tok | +| 01:40 | Edited src/docs/deployment.md | 1→3 lines | ~329 | +| 01:40 | Session end: 22 writes across 8 files (_live_e2e_common.py, test_e2e_live_push.py, test_e2e_live_ha_push.py, manual_ha_deploy.sh, test_repro_bug1485.py) | 27 reads | ~271727 tok | +| 01:44 | Session end: 22 writes across 8 files (_live_e2e_common.py, test_e2e_live_push.py, test_e2e_live_ha_push.py, manual_ha_deploy.sh, test_repro_bug1485.py) | 27 reads | ~271727 tok | +| 01:47 | Session end: 22 writes across 8 files (_live_e2e_common.py, test_e2e_live_push.py, test_e2e_live_ha_push.py, manual_ha_deploy.sh, test_repro_bug1485.py) | 27 reads | ~271727 tok | +| 01:48 | Edited src/docs/deployment.md | 1→2 lines | ~195 | +| 01:48 | Session end: 23 writes across 8 files (_live_e2e_common.py, test_e2e_live_push.py, test_e2e_live_ha_push.py, manual_ha_deploy.sh, test_repro_bug1485.py) | 27 reads | ~272151 tok | +| 01:53 | Session end: 23 writes across 8 files (_live_e2e_common.py, test_e2e_live_push.py, test_e2e_live_ha_push.py, manual_ha_deploy.sh, test_repro_bug1485.py) | 27 reads | ~272151 tok | +| 01:58 | Edited src/controller/testsuite/waldump.h | expanded (+7 lines) | ~210 | +| 01:58 | Edited src/controller/testsuite/waldump.c | 3→4 lines | ~49 | +| 01:59 | Edited src/controller/testsuite/waldump.c | added 4 condition(s) | ~670 | +| 01:59 | Edited src/controller/testsuite/waldump.c | modified visit() | ~102 | +| 01:59 | Edited src/controller/testsuite/waldump.c | modified if() | ~184 | +| 01:59 | Edited src/controller/testsuite/waldump.c | added 2 condition(s) | ~232 | +| 02:00 | Edited src/controller/testsuite/waldump.c | 3→4 lines | ~42 | +| 02:00 | Edited src/controller/testsuite/waldump.c | 3→3 lines | ~48 | +| 02:00 | Edited src/controller/testsuite/waldump.c | 3→7 lines | ~95 | +| 02:00 | Edited src/controller/testsuite/test_waldump.c | 5→7 lines | ~39 | +| 02:01 | Edited src/controller/testsuite/test_waldump.c | modified test_config_marker_type_decoded() | ~1328 | +| 02:01 | Edited src/controller/testsuite/test_waldump.c | 2→5 lines | ~74 | +| 02:05 | Session end: 35 writes across 11 files (_live_e2e_common.py, test_e2e_live_push.py, test_e2e_live_ha_push.py, manual_ha_deploy.sh, test_repro_bug1485.py) | 29 reads | ~280958 tok | +| 02:25 | Session end: 35 writes across 11 files (_live_e2e_common.py, test_e2e_live_push.py, test_e2e_live_ha_push.py, manual_ha_deploy.sh, test_repro_bug1485.py) | 30 reads | ~366672 tok | +| 02:30 | Session end: 35 writes across 11 files (_live_e2e_common.py, test_e2e_live_push.py, test_e2e_live_ha_push.py, manual_ha_deploy.sh, test_repro_bug1485.py) | 30 reads | ~366672 tok | +| 02:31 | Session end: 35 writes across 11 files (_live_e2e_common.py, test_e2e_live_push.py, test_e2e_live_ha_push.py, manual_ha_deploy.sh, test_repro_bug1485.py) | 30 reads | ~366672 tok | +| 02:32 | Session end: 35 writes across 11 files (_live_e2e_common.py, test_e2e_live_push.py, test_e2e_live_ha_push.py, manual_ha_deploy.sh, test_repro_bug1485.py) | 30 reads | ~366672 tok | +| 03:04 | Merged origin/working (64 commits: config-upgrade-snapshot feature + HA/repl bug fixes), deduped capnpc override — kept xce.nix fetchFromGitHub pin (bug-918 canonical fix), dropped flake.nix ghfast.top overlay | src/flake.nix, src/nixSupport/xce.nix | merged clean, 0 conflicts; nix files parse OK | ~1200 | +| 03:50 | User rule: never push to Rongsong's branch (origin/working) without explicit permission; we only sync his code into our own branch. Written to Claude memory (xce-push-policy-rongsong) + cerebrum User Preferences | .wolf/cerebrum.md, /home/lchen/.claude/projects/-home-lchen-code/memory/ | persisted both stores | ~400 | diff --git a/.wolf/token-ledger.json b/.wolf/token-ledger.json index ceaaf2e..ffc7d47 100644 --- a/.wolf/token-ledger.json +++ b/.wolf/token-ledger.json @@ -2,14 +2,14 @@ "version": 1, "created_at": "2026-05-21T04:35:43.577Z", "lifetime": { - "total_tokens_estimated": 228857307, - "total_reads": 29974, - "total_writes": 48217, - "total_sessions": 248, - "anatomy_hits": 19129, - "anatomy_misses": 10123, - "repeated_reads_blocked": 85920, - "estimated_savings_vs_bare_cli": 2062340397 + "total_tokens_estimated": 318096446, + "total_reads": 36446, + "total_writes": 57038, + "total_sessions": 265, + "anatomy_hits": 23910, + "anatomy_misses": 11619, + "repeated_reads_blocked": 101295, + "estimated_savings_vs_bare_cli": 2665433727 }, "sessions": [ { @@ -443430,6 +443430,87976 @@ "repeated_reads_blocked": 32, "anatomy_lookups": 21 } + }, + { + "id": "session-2026-07-23-0244", + "started": "2026-07-23T09:44:11.795Z", + "ended": "2026-07-23T09:53:09.277Z", + "reads": [ + { + "file": "/home/rshen/projects/xce/worktrees/config/.claude/skills/xce-test-ha/run-ha-soak.sh", + "tokens_estimated": 30050, + "was_repeated": false, + "anatomy_had_description": false + }, + { + "file": "/home/claude/.claude/projects/-home-rshen-projects-xce-worktrees-config/b2812d1d-311c-4e5f-90cc-ffa588c73c50/tool-results/buiyr6gg6.txt", + "tokens_estimated": 0, + "was_repeated": true, + "anatomy_had_description": false + }, + { + "file": "/tmp/xce-test-ha-1418-recheck2.log", + "tokens_estimated": 0, + "was_repeated": false, + "anatomy_had_description": false + }, + { + "file": "/home/rshen/projects/xce/worktrees/config/src/tools/xce-build.sh", + "tokens_estimated": 1703, + "was_repeated": false, + "anatomy_had_description": false + } + ], + "writes": [], + "totals": { + "input_tokens_estimated": 31753, + "output_tokens_estimated": 0, + "reads_count": 4, + "writes_count": 0, + "repeated_reads_blocked": 1, + "anatomy_lookups": 2 + } + }, + { + "id": "session-2026-07-23-0244", + "started": "2026-07-23T09:44:11.795Z", + "ended": "2026-07-23T10:00:43.913Z", + "reads": [ + { + "file": "/home/rshen/projects/xce/worktrees/config/.claude/skills/xce-test-ha/run-ha-soak.sh", + "tokens_estimated": 30050, + "was_repeated": false, + "anatomy_had_description": false + }, + { + "file": "/home/claude/.claude/projects/-home-rshen-projects-xce-worktrees-config/b2812d1d-311c-4e5f-90cc-ffa588c73c50/tool-results/buiyr6gg6.txt", + "tokens_estimated": 0, + "was_repeated": true, + "anatomy_had_description": false + }, + { + "file": "/tmp/xce-test-ha-1418-recheck2.log", + "tokens_estimated": 0, + "was_repeated": false, + "anatomy_had_description": false + }, + { + "file": "/home/rshen/projects/xce/worktrees/config/src/tools/xce-build.sh", + "tokens_estimated": 1703, + "was_repeated": false, + "anatomy_had_description": false + }, + { + "file": "/home/claude/.claude/projects/-home-rshen-projects-xce-worktrees-config/b2812d1d-311c-4e5f-90cc-ffa588c73c50/tool-results/b51smtfk0.txt", + "tokens_estimated": 0, + "was_repeated": true, + "anatomy_had_description": false + } + ], + "writes": [], + "totals": { + "input_tokens_estimated": 31753, + "output_tokens_estimated": 0, + "reads_count": 5, + "writes_count": 0, + "repeated_reads_blocked": 2, + "anatomy_lookups": 2 + } + }, + { + "id": "session-2026-07-23-0244", + "started": "2026-07-23T09:44:11.795Z", + "ended": "2026-07-23T10:16:08.776Z", + "reads": [ + { + "file": "/home/rshen/projects/xce/worktrees/config/.claude/skills/xce-test-ha/run-ha-soak.sh", + "tokens_estimated": 30050, + "was_repeated": false, + "anatomy_had_description": false + }, + { + "file": "/home/claude/.claude/projects/-home-rshen-projects-xce-worktrees-config/b2812d1d-311c-4e5f-90cc-ffa588c73c50/tool-results/buiyr6gg6.txt", + "tokens_estimated": 0, + 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a/reports/jul19-jul26-2026.md b/reports/jul19-jul26-2026.md new file mode 100644 index 0000000..250d422 --- /dev/null +++ b/reports/jul19-jul26-2026.md @@ -0,0 +1,225 @@ +# Work Summary: Jul 19 – Jul 26, 2026 + +## Branch: `config` | Project: XCE Cluster Management System + +--- + +## Overview + +Week focused on three major workstreams: completing `clusterconfig-schema-split` (Jul 21), shipping `admin-config-tool` (Jul 22), and executing `config-upgrade-snapshot` tasks 8.0–8.9 (Jul 24–26). Two critical bugs discovered during soak testing (bug-1475 standby liveness stall, bug-1476 config-reload UAF) remain open. Two bugs fixed and committed (bug-1472 worker replication, bug-1474 repl slot clobber). + +--- + +## Day-by-Day Summary + +### Jul 19 (Fri) + +- **bug-1452** fixed: `commit_engine_fini`/`persist_stop` teardown race in controller +- **xce-audit-invariants** controller pass completed +- **bug-1453/1454/1455/1456**: scheduler + xcecli dead CA-cert plumbing removed, scheduler HA config bugs fixed + +### Jul 20 (Sat) + +- Continued scheduler/xcecli cleanups from Jul 19 +- Git: `94f50ce6` — fix(scheduler,cli): bug-1453–1456 remove dead CA-cert plumbing + +### Jul 21 (Mon) — `clusterconfig-schema-split` ship day + +- **All 12 tasks (1.1–6.2) completed**, spec marked implementation-complete +- Dead fields removed from `ClusterConfig` capnp schema and `cluster_config_t` +- Two-tier port fallback (`cluster_open_listener`), dead port defaulting removed +- Orphaned `HashZArrayConfig`/`ResmgrConfig` structs removed +- CLI flags for hash-table tunables (optional Req 6) +- 3-node HA live soak verified clean +- Commits: 17 commits from `0205ac3c` through `519e11c7` + +### Jul 22 (Tue) — `admin-config-tool` ship day + +- **All 18 tasks (1.1–5.6) completed**, spec marked implementation-complete +- **New binary**: `xceadmin` — Python-based admin config build/push/discovery tool +- Package: `xceadmin.build` (YAML→capnp), `xceadmin.push` (controller push), `xceadmin.discovery` (auto-detect), `xceadmin.cli` (CLI entry) +- Library: `xcecommon.schema`, `xcecommon.validation`, `xcecommon.mapping`, `xcecommon.wire` +- Schema fix: `Data` struct renamed to `XceData` (unshadow capnp builtin blob type) +- Wired into meson + nix build, HA deploy/test skills, `deploy-ha.sh --build-config` +- Tests: golden-file build determinism, mock-controller push/dry-run coverage +- Commits: 18 commits from `b30a856a` through `b6bf7cb8` + +### Jul 23 (Wed) — Stabilization + Spec expansion + +- **config-upgrade-snapshot** spec expanded: 6 requirements, 26 ACs, 9 tasks (8.0–8.9) +- `blocked_on` cleared to `[]` after bug-1418 re-verified FIXED (10-round chaotic soak PASS) +- **bug-1462** fixed: late-joiner config-push stall — `ha_promotion_config_tag_floor` clamps `committed_config_tag` to `max(safe_tag, self_tag)`. 20+20 round soaks PASS +- Limits.yaml wired through `cluster_config` into controller (real config path) +- xcecli: restored dangling CA-cert cleanup, enabled https support +- **resource-distribution-mapping** spec scaffolded, scope deferred (3 candidate sizes) +- **cc-sdd to Gitea sync** skill added +- **bug-1464** identified: `xce-build.sh` shared build-dir clobber (per-component `rm -rf`) +- Commits: 12 commits from `bf6a9b34` through `cae4ef0c` + +### Jul 24 (Thu) — config-upgrade-snapshot heavy lift + +Tasks 8.0–8.5 executed: + +- **Task 8.0**: HostAdminState/QueueAdminState capnp structs defined, snapshot format version bumped (`9e68335a`) +- **Task 8.1**: Host admin-state frames collected into checkpoint, queue frames migrated to capnp wire (`a71aa3f8`, `70ff3e5b`) +- **Task 8.2**: Embed active configuration bytes in every checkpoint — safety gate (`387ea35c`) +- **Task 8.3**: Restore host admin-state frame safely with create-if-missing (`5b1600a8`) +- **Task 8.4**: Configcompare tool + snapverify extended for byte-identical diff (`1d09631d`) +- **Task 8.5**: Add bug-857 regression test, correct design.md (`2bd44e8e`) +- **Materialization**: upgrade snapshot materialized on config-marker apply (`1da26b04`) +- **Activation fence**: hash-verification gate on materialized snapshot; primary serving/promotion gated on fence pass (`7b507156`, `89b85e16`) +- Removed restart/replay fallback for config activation (`41af0540`) + +Commits: 10 commits from `9e68335a` through `1da26b04` + +### Jul 25 (Fri) — Soak testing, bug discovery, task 8.6–8.9 + +- **Task 8.6**: Live config-upgrade soak infra built (`run-ha-soak.sh --config-upgrade`). Fixed bug-1468 (repl config-push duplicate-connect) and bug-1469 (config tag clamp). **Blocked on bug-1472** (out-of-scope HA replication defect for worker admin-status). +- **Task 8.7**: Fault-inject crash/restart + leadership change tests (`d4af605f`) +- **Task 8.8**: Overlapping config upgrades supersede cleanly (`b78efd03`) +- **Task 8.9**: Live WAL-trim-under-chaos soak infra, blocked on bug-1474 (`8b3e2ab0`) + +**Major bugs discovered (open):** + +| Bug | Severity | Description | +|-----|----------|-------------| +| **bug-1475** | HIGH | Standby catch-up liveness stall: WAL_CHECKPOINT at lsn=12 poisons applied-lsn advertisement. Root cause: `persist_write_checkpoint_marker` does NOT update term index → `on_get_entry_term(12)` returns 0 → raft library takes `ae_append` path not `ae_conflict_truncate`. Primary streams lsn=13 at raft index 12 → ctrl-1 applied_lsn never advances past 12 → infinite `ae_reject_logmismatch` loop. Full mechanism documented in claude-mem obs 16689–16706. | +| **bug-1476** | HIGH | `load_primary_config` concurrent UAF (heap-use-after-free). Two vCPU threads can concurrently free and decode `myconf->cluster_config` via `handle_repl_config_push` → ASAN crash in `decode_Resource_list`. No mutex protecting the read-free-decode sequence. | + +**Build issues:** +- Ninja/Meson parallel-build race (5th recurrence logged) +- ASAN rebuild: 2 full retries needed, all 1033 tests pass clean after retry2 + +Commits: 7 commits from `959b0cda` through `8b3e2ab0` + +### Jul 26 (Sat, early morning) — Bug fixes for 8.6/8.9 blockers + +- **bug-1474** FIXED: two-pass slot allocation (virgin→oldest-disconnect) in `repl.c`. WAL-retention guard clobber prevented standby slot reuse. 2 tests RED→GREEN. Commit: `c0b0c7d1` +- **bug-1472** FIXED: worker admin-status replication gap. `worker_from_capnp` used INSERT semantics (new worker) instead of UPDATE (existing worker). +3 tests. Commit: `7547a8f1` +- **1033 tests all pass** (C + Go + Python layers, ASAN clean) + +Commits: 2 commits + +--- + +## Spec Status + +| Spec | Phase | Status | +|------|-------|--------| +| **config-upgrade-snapshot** | Implementation | Tasks 8.0–8.9: 8.0–8.5 complete, 8.6 blocked on bug-1472 (now fixed), 8.7 done, 8.8 done, 8.9 blocked on bug-1474 (now fixed). Tasks 8.6 & 8.9 need soak re-verification. 6 reqs / 26 ACs. | +| **clusterconfig-schema-split** | **COMPLETE** | All 12 tasks done, live-soak verified | +| **admin-config-tool** | **COMPLETE** | All 18 tasks done, xceadmin binary shipped | +| **resource-distribution-mapping** | Scoping | Scaffolded, scope deferred | + +--- + +## Bug Register (Jul 19–26) + +| Bug | Date | Status | Description | +|-----|------|--------|-------------| +| bug-1452 | Jul 19 | **FIXED** | commit_engine_fini/persist_stop teardown race | +| bug-1453/4/5/6 | Jul 19–20 | **FIXED** | Dead CA-cert plumbing in scheduler/xcecli | +| bug-1418 | Jul 23 | **VERIFIED FIXED** | term desync + apply-divergent stall (re-verified with 10-round chaotic soak) | +| bug-1462 | Jul 23 | **FIXED** | Late-joiner config-push stall | +| bug-1464 | Jul 23 | **KNOWN** | xce-build.sh shared build-dir clobber (mitigation: use `/xce-build all`) | +| bug-1468 | Jul 25 | **FIXED** | Repl config-push duplicate-connect | +| bug-1469 | Jul 25 | **FIXED** | Config tag clamp on promotion | +| bug-1475 | Jul 25 | **OPEN** | Standby catch-up liveness stall (WAL_CHECKPOINT term-index gap) | +| bug-1476 | Jul 25 | **OPEN** | load_primary_config concurrent UAF | +| bug-1472 | Jul 25→26 | **FIXED** | Worker admin-status replication (INSERT→UPDATE semantics) | +| bug-1474 | Jul 25→26 | **FIXED** | Repl slot-reuse guard clobber (two-pass allocation) | + +--- + +## Commits: 63 total (Jul 19–26) + +``` +c0b0c7d1 fix(repl): harden standby slot allocation (bug-1474) +7547a8f1 fix(worker): replicate admin host-control status (bug-1472) +8b3e2ab0 feat(config-upgrade-snapshot): task 8.9 WAL-trim-under-chaos soak infra +b78efd03 feat(config-upgrade-snapshot): task 8.8 overlapping config upgrades +d4af605f test(config-upgrade-snapshot): fault-inject crash/restart + leadership (task 8.7) +959b0cda feat(config-upgrade-snapshot): live config-upgrade soak + bug-1468/1469 (task 8.6) +2bd44e8e feat(config-upgrade-snapshot): bug-857 regression test (task 8.5) +1d09631d feat(config-upgrade-snapshot): configcompare tool + snapverify (task 8.4) +4aeae6e2 test(config-upgrade-snapshot): WAL-trim safety + fault-injection seam +41af0540 feat(config-upgrade-snapshot): remove restart/replay fallback +89b85e16 feat(config-upgrade-snapshot): gate primary on activation fence +7b507156 feat(config-upgrade-snapshot): activation fence materialization+hash +1da26b04 feat(config-upgrade-snapshot): materialize upgrade snapshot on config-marker apply +00cd26a9 feat(config-upgrade-snapshot): decode host/queue admin-state on checkpoint load +5b1600a8 feat(config-upgrade-snapshot): restore host admin-state safely +38735ea5 feat(config-upgrade-snapshot): embed config bytes in checkpoint +70ff3e5b feat(config-upgrade-snapshot): migrate queue admin-state to capnp +a71aa3f8 feat(config-upgrade-snapshot): collect host admin-state frames +9e68335a feat(config-upgrade-snapshot): HostAdminState/QueueAdminState capnp structs +e0c5e8b7 fix(nix): pin capnpc source to immutable commit +cae4ef0c chore: save wolf state +c921e59b feat: resource distribution map project +1705495a fix(admin-config-tool): xceadmin config build warnings +4ec40167 fix(xcecli): restore CA-cert cleanup, enable https +ff1be480 merge +b87d5e68 chore: commit wolf status +60c25c39 chore(openwolf): update session memory/buglog/anatomy +8ee98bee docs(config-upgrade-snapshot): expand spec to 6 reqs/26 ACs +bf6a9b34 feat(tooling): cc-sdd to Gitea sync skill +18e7a0e9 feat(controller): wire limits.yaml through cluster_config +0649e17f fix(controller): clamp committed_config_tag on promotion (bug-1462) +ee8473bd feat(admin-config-tool): drop ha/data/, match real client TLS +db2b5f17 fix(admin-config-tool): pin xceadmin python3 to meson resolution +d5330fc9 feat(admin-config-tool): wire xceadmin into HA deploy/test skills +893a01db feat(admin-config-tool): install standalone xceadmin binary via meson +e4fd9e1d feat(admin-config-tool): wire xceadmin into meson + nix build +b6bf7cb8 chore(admin-config-tool): mark implementation-complete (18 tasks done) +a1478510 docs(admin-config-tool): commit spec docs and example configs +67cc3611 feat(admin-config-tool): task 5.6 mock-controller push/dry-run coverage +48a5a0b4 feat(admin-config-tool): task 5.4 golden-file build determinism tests +b5040e08 feat(admin-config-tool): tasks 5.1-5.3 mapping/wire/schema coverage +ad27147a feat(admin-config-tool): task 4.2 deploy-ha.sh --build-config +eeda32c6 feat(admin-config-tool): task 4.1 xceadmin.cli +c33ef7d4 feat(admin-config-tool): task 3.3 xceadmin.push +e53c086e fix(schema): rename Data -> XceData +7ed3a394 feat(admin-config-tool): task 3.2 xceadmin.discovery +72798d4a feat(admin-config-tool): task 3.1 xceadmin.build +77ee831e feat(admin-config-tool): task 2.4 xcecommon.wire +666a838f feat(admin-config-tool): task 2.3 xcecommon.mapping +3a2094a4 merge: job_peek_lchen +dbf5c6c5 feat(admin-config-tool): task 2.2 xcecommon.schema +12b13a54 feat(admin-config-tool): task 2.1 xcecommon.validation +798f19b8 feat(admin-config-tool): task 1.3 nix + xce-build.sh integration +2e4ef4e2 feat(admin-config-tool): task 1.2 shared exception taxonomy +b30a856a feat(admin-config-tool): task 1.1 xceadmin package skeleton +519e11c7 chore(controller): clusterconfig-schema-split mark complete +a74eb008 docs(controller): clusterconfig-schema-split close validation gaps +553da7c7 feat(controller): clusterconfig-schema-split task 6.2 CLI tunables +c3107b95 feat(controller): clusterconfig-schema-split task 6.1 CLI flags +edd79562 chore(controller): clusterconfig-schema-split task 5.3 single-node live-verified +3e01fb1b chore(controller): clusterconfig-schema-split task 5.2 3-node HA soak +f503a43d feat(controller): clusterconfig-schema-split task 5.1 regenerate cluster.bin +29f9b026 chore(controller): clusterconfig-schema-split task 4 build+test verified +ba6fdc57 feat(controller): clusterconfig-schema-split task 3 fix test fixtures +1fa78443 feat(controller): clusterconfig-schema-split task 2.3 remove dead port default +81fecb49 feat(controller): clusterconfig-schema-split task 2.2 remove candidates debug-dump +8f047d93 feat(controller): clusterconfig-schema-split task 1.3 remove orphaned structs +1229f9a9 feat(controller): clusterconfig-schema-split task 2.1 two-tier port fallback +0205ac3c feat(controller): clusterconfig-schema-split task 1.2 remove dead members +51524820 feat(controller): clusterconfig-schema-split task 1.1 remove dead fields +94f50ce6 fix(scheduler,cli): bug-1453/1454/1455/1456 dead CA-cert + HA config +619f41f7 chore: update OpenWolf session state (bug-1452 fix) +d67ccc22 fix(controller): bug-1452 commit_engine_fini/persist_stop teardown race +e1f4d676 chore: update OpenWolf session state (xce-audit-invariants pass) +``` + +--- + +## Next Steps + +1. **Soak re-verify tasks 8.6 and 8.9** with bug-1472 + bug-1474 fixes applied. Both blocking bugs now fixed, but soak must pass end-to-end. +2. **bug-1475** needs root-cause fix: `persist_write_checkpoint_marker` must update term index so `on_get_entry_term` returns correct term for WAL_CHECKPOINT slot. +3. **bug-1476** needs mutex guard on `load_primary_config`'s `myconf->cluster_config` read-free-decode sequence. +4. **Task 8.6** blocked_on cleared (bug-1472 fixed), can proceed with worker admin-status rotation verification. +5. **Task 8.9** blocked_on cleared (bug-1474 fixed), can proceed with WAL-trim-under-chaos verification. + +--- + +*Generated 2026-07-26 | Branch: `config` | 63 commits, 4 bugs fixed, 2 specs shipped, 2 bugs open* diff --git a/src/controller/CLAUDE.md b/src/controller/CLAUDE.md index 38d2eba..9afa17f 100644 --- a/src/controller/CLAUDE.md +++ b/src/controller/CLAUDE.md @@ -62,10 +62,16 @@ The file `raft/raft.tla` contains Diego Ongaro's TLA+ specification of the Raft | `RequestVote(i,j)` | `raft_on_vote_request` / reply path | `raft.c:106,169` | | `BecomeLeader(i)` | `raft_cb_become_leader` | `ha.c:347` | | `AdvanceCommitIndex(i)` | `repl_wait_majority_ack` → advance `committed_lsn` | `repl.c:338` | -| `AppendEntries(i,j)` | `OPCode_nop` heartbeat + WAL streaming | `ha.c:2880`, `config_repl.c:1489` | +| `AppendEntries(i,j)` — production send (LIVE) | `repl_broadcast` (per-entry fan-out on append, NACK-driven retry via `ha_raft_on_repl_nack`) + `ha_stream_wal_to_standby` (catch-up-range streaming) — the sole production `AppendEntries`-equivalent send/retry/backoff mechanism (raft-adapter-conformance Req 3.3) | `repl.c:295`, `config_repl.c:2351` | +| `AppendEntries(i,j)` — nextIndex-driven sender (DORMANT, documented) | `raft_send_append_entries` is fully protocol-conformant but has ZERO production callers (only `raft_sim.c` and an `XCE_TESTING` test helper); its registered `on_send_append_entries` callback `ha_cb_send_append_entries_stub` is reachable only through it. Kept as an intentionally-dormant reference implementation (retire/wire-in both rejected, see `research.md`), guarded against silent regression by `ha_send_append_entries_stub_call_count` staying 0 while the production path fires (`test_ha_core_safety.c` task 4.2) | `src/lib/raft/raft.c:595`, `ha.c:2590` (stub), `ha.c:2588` (guard counter) | +| `AppendEntries(i,j)` reply — WAL catch-up reject | Every WAL catch-up rejection sends an explicit `WalAckReply{success=0}` via `ha_send_wal_ack_reply_ex` back to the primary — never a silent drop (bug-1479; reply-construction boundary regression-locked by raft-adapter-conformance task 5.1) | `ha.c:3155` (fn), `ha.c:3190` (accept call site), `ha.c:3326` (reject call site) | +| `AppendEntries(i,j)` reply — configuration-push accept/reject | Every `handle_repl_config_push` outcome — all 4 reject branches plus the success/`-EAGAIN`-activation-deferred tail — sends exactly one explicit `ReplConfigPushReply{accepted, term}` via `send_config_push_reply`, so the primary can distinguish an active reject from a lost push (raft-adapter-conformance Req 2.2-2.5); the reply's `term` field feeds the primary's `raft_on_higher_term_observed` term-adoption alongside the heartbeat and WAL-NACK vectors (Req 7.4/7.5) | `config_repl.c:1267` (send fn), `config_repl.c:1308-1381` (handler), `cluster.c:750-780` (primary-side accept/reject branch + term-adoption) | +| `RequestVote`/`PreVote(i,j)` reply — endpoint-failure routing, all timings | A vote/PreVote endpoint failure is always counted through the production tally (`vote_reply_dispatch` / `pre_vote_reply_dispatch`), never the legacy `handle_request_vote_reply` path — true both at connect-time (bug-1423/1424, regression-locked) and post-connect, i.e. a failure after connect but before a reply arrives (raft-adapter-conformance Req 4.2/4.3, closing that one remaining failure-timing gap). `vote_ep_err_handler` (real-vote) and `pre_vote_ep_err_handler` (PreVote) are separate handlers sharing one `CTRL_PRIMARY`-cleanup helper | `ha.c:7667` (`vote_ep_err_handler`), `ha.c:7705` (`pre_vote_ep_err_handler`), `ha.c:7627` (shared cleanup helper), registered at `ha.c:692` / `ha.c:831` | | `ClientRequest(i,v)` | Job submit → WAL append → `repl_wait_majority_ack` | `persist.c`, `repl.c` | | `UpdateTerm(i,j,m)` | Term CAS in `handle_request_vote` / vote reply handler | `ha.c:1218-1230` | +> Full gap-analysis citations, options considered, and design rationale for the `raft-adapter-conformance` rows above (including the dormant-sender decision and the vote/PreVote handler-split decision): `.kiro/specs/raft-adapter-conformance/research.md` and `design.md`. This table stays the terse, current pointer; the evidentiary trail lives there. + ### Safety Invariants Verified **Election Safety** (≤1 leader per term): Enforced by `votedFor` — a server grants at most one vote per term (`raft_on_vote_request` line 145-151). A candidate needs majority votes; each server votes at most once per term. @@ -107,6 +113,9 @@ When modifying HA protocol code (election, replication, heartbeat), verify: - [ ] Durability flushing makes a contiguous prefix durable; `durable_lsn` is a prefix watermark (never a per-entry set) - [ ] Causal dependencies are appended in order (cause before effect, e.g. submit before start) - [x] (post `ha-commit-durability`, landed 2026-06-18) a member counts toward the commit majority only at its durably-persisted LSN; acknowledged ⇒ durable on a majority +- [x] (post `raft-adapter-conformance`, landed 2026-07-29) every reject of a replication-class message (WAL catch-up entry, configuration push) sends an explicit reply distinguishable from a lost message — never a silent drop (`ha_send_wal_ack_reply_ex(success=0)` for WAL catch-up, bug-1479; `send_config_push_reply(accepted=0)` for config-push, Req 2.2-2.5) +- [x] (post `raft-adapter-conformance`, landed 2026-07-29) every vote/PreVote endpoint failure — connect-time or post-connect (a failure after connect but before a reply) — is counted through the production tally (`vote_reply_dispatch`/`pre_vote_reply_dispatch`), never the legacy `handle_request_vote_reply` path (Req 4.1-4.4) +- [x] (post `raft-adapter-conformance`, landed 2026-07-29) `raft_send_append_entries`/`ha_cb_send_append_entries_stub` remains dormant in production (zero callers) by deliberate documented decision, not oversight — `ha_send_append_entries_stub_call_count` stays 0 while `repl_broadcast`/`ha_stream_wal_to_standby` fire for the same scenario (Req 3.3) ## HA Design Constraints diff --git a/src/controller/cluster.c b/src/controller/cluster.c index 4cabe95..1146620 100644 --- a/src/controller/cluster.c +++ b/src/controller/cluster.c @@ -669,10 +669,30 @@ static int myreq_handler(vtask_t* task) break; case OPCode_upgradeConfig: #if CONF_ENABLE_UPGRADE_CONFIG - /* OPCode_upgradeConfig is sent BY the primary TO standbys to push config. - * Standbys must apply it; only a primary sending this to itself is invalid. */ - if (ha_is_primary(&c->ha)) { - /* Primary should not receive its own config push — ignore */ + /* OPCode_upgradeConfig is sent BY an admin client (or xceadmin's + * config-push tool) TO the primary controller, which decodes the + * blob, verifies it, and drives it through config_commit_change() + * (the (term,lsn) marker consensus path) — see + * do_upgrade_config_with_bytes's doc comment, config_repl.c. Only the + * primary can commit a WAL entry, so a standby cannot service this + * request; ha_dispatch_gate already denies OPCode_upgradeConfig for + * every non-primary role (it is absent from the CTRL_STANDBY / + * CTRL_INIT / CTRL_ELECTING allow-lists, ha.c), so this check is a + * defensive belt-and-suspenders guard, not the primary gate. + * + * bug-fix (2026-07-25): this check was inverted from + * commit fd93997f ("election-iomgr-refactor", 2026-05-31) onward — + * it rejected the request WHEN primary, unconditionally reachable + * only on primary (per the dispatch-gate note above), making + * handle_upgrade_config() permanently unreachable from any network + * caller (only unit tests calling it directly ever exercised it). + * Independently diagnosed and documented as a blocking risk by the + * admin-config-tool spec (design.md "Boundary Commitments" / + * "Risks") before config-upgrade-snapshot task 8.6 needed a live + * OP_upgradeConfig sender and hit the same wall. Restored to the + * pre-regression (correct) polarity. */ + if (!ha_is_primary(&c->ha)) { + /* Standby cannot commit a config change — reject loud. */ xce_reply_t ureply; init_reply_by_req(&ureply, &request); ureply.status = -EAGAIN; @@ -729,6 +749,26 @@ static int myreq_handler(vtask_t* task) && workreply->data.replconfigpushreplymsg) { repl_config_push_reply_t *cack = workreply->data.replconfigpushreplymsg; + + /* raft-adapter-conformance Req 7.4/7.5: a config-push reply now + * carries the replying member's current term (task 1 schema + * addition + task 2.1 send side) -- route it through the same + * term-discovery entry point the heartbeat-reply and WAL-NACK + * vectors already use (bug-1421; ha.c raft_lock-guarded + * raft_on_higher_term_observed calls) so a stale-term primary + * adopts the higher term and steps down instead of retrying + * forever against a standby that has already moved on. Applies + * regardless of accept/reject below -- a reject can still carry + * a useful higher term. raft_on_higher_term_observed is itself + * strictly-greater-than-only (ha-async-io.md Heartbeat Model), + * so no separate `>` comparison is needed here; raft_lock + * discipline mirrors the vote-request/pre-vote-request branches + * above (bug-1435 -- serialize against concurrent raft_state_t + * access). */ + pthread_mutex_lock(&c->ha.raft_lock); + (void)raft_on_higher_term_observed(&c->ha.raft, cack->term); + pthread_mutex_unlock(&c->ha.raft_lock); + if (cack->accepted) { repl_on_config_ack(&c->persist.repl, ep, cack->version_tag); TRACE("myreq_handler: config ACK from inbound standby" @@ -759,6 +799,39 @@ static int myreq_handler(vtask_t* task) return rc; } +#ifdef XCE_TESTING +/* + * myreq_handler_for_test: expose myreq_handler for tests (peer_ctrl_msg_ + * handler_for_test precedent, ha.c). Builds the vtask_t/vtask_data_t wrapper + * vtask_entry constructs internally in production so a test can decode+ + * dispatch a real packet through the actual switch -- including the + * ReplConfigPushReply branch's term-adoption check (raft-adapter- + * conformance Req 7.4/7.5). Packet ownership follows myreq_handler's own + * contract: myreq_handler unconditionally calls xce_decode(pkt, ...) as its + * first step, and xce_decode() itself consumes pkt -- it calls + * free_packet(pkt) (frees pkt->data) and FREEUP(pkt) (frees the io_packet_t + * struct) before returning (request.c). Ownership of `pkt` is therefore + * TRANSFERRED into this call: the caller must NOT touch or free `pkt` after + * calling myreq_handler_for_test -- doing so is a use-after-free/double-free. + * (xce_free_request separately releases the decoded xce_request_t, an + * unrelated stack-local object in myreq_handler.) + */ +int myreq_handler_for_test(endpoint_t* ep, io_packet_t* pkt) +{ + vtask_data_t data; + memset(&data, 0, sizeof(data)); + data.vtype = VTASK_IO; + data.u.iodata.ep = ep; + data.u.iodata.pkt = pkt; + + vtask_t task; + memset(&task, 0, sizeof(task)); + task.data = &data; + + return myreq_handler(&task); +} +#endif /* XCE_TESTING */ + static int vtask_entry(vtask_t* task) { int rc; diff --git a/src/controller/config_repl.c b/src/controller/config_repl.c index 3b04d62..d3a5944 100644 --- a/src/controller/config_repl.c +++ b/src/controller/config_repl.c @@ -611,10 +611,38 @@ static int load_cluster_config_from_file(char *file, cluster_config_t **config) /* ── load_primary_config ────────────────────────── */ +#ifdef XCE_TESTING +/* load_primary_config_race_hook: test-only synchronization seam (same + * pattern as push_thread_send_hook / xce_wal_stream_request_hook). When + * non-NULL, load_primary_config() calls this immediately after capturing the + * OLD myconf->cluster_config pointer this invocation is about to retire + * (free), right before it actually retires it -- letting a unit test + * deterministically force a SECOND, real, concurrent load_primary_config + * call through this exact window instead of depending on scheduler timing. + * NULL in production -- no behaviour change. See + * test_bug1476_concurrent_load_primary_config_no_uaf_or_double_free + * (test_config_repl.c) for the RED-phase reproduction this was built for: + * with the lock below removed, this hook deterministically reproduces the + * live ASan heap-use-after-free bug-1476 caught (two concurrent + * load_primary_config calls racing the free of the SAME myconf-> + * cluster_config pointer). With the lock, a second invocation can never + * even reach this hook while the first is parked here -- it blocks + * acquiring myconf->lock before getting this far, which is the + * serialization proof the fix requires. */ +void (*load_primary_config_race_hook)(void) = NULL; +#endif + int load_primary_config(cluster_t *c) { myconf_t *myconf = c->myconf; + /* bug-1476: serialize the whole free-decode-publish sequence against a + * concurrent load_primary_config() call for the SAME myconf_t. Held + * across every return path below, including the success path — a + * second caller must block here before it can even reach the race hook + * fired near the retire step, not merely around that step alone. */ + mylock_lock(&myconf->lock); + /* Build conf dir path: / */ char conf_dir[4096]; snprintf(conf_dir, sizeof(conf_dir), "%s/%s", @@ -627,14 +655,17 @@ int load_primary_config(cluster_t *c) INFO("No config at '%s/conf/current' (rc=%d) — " "will fetch from primary after election", conf_dir, rc); + mylock_unlock(&myconf->lock); return -ENOENT; } /* Heap-allocate conffile so it survives past this stack frame */ free(myconf->conffile); myconf->conffile = NULL; - if (asprintf(&myconf->conffile, "%s/conf/%s", conf_dir, fname) < 0) + if (asprintf(&myconf->conffile, "%s/conf/%s", conf_dir, fname) < 0) { + mylock_unlock(&myconf->lock); return -ENOMEM; + } /* Read raw bytes and check size */ uint8_t *bytes = NULL; @@ -644,6 +675,7 @@ int load_primary_config(cluster_t *c) ERROR("Primary config '%s' unreadable: %d", myconf->conffile, rc); free(myconf->conffile); myconf->conffile = NULL; + mylock_unlock(&myconf->lock); return rc; } @@ -653,53 +685,61 @@ int load_primary_config(cluster_t *c) memcpy(&tag, myconf->config_sha256, 8); myconf->config_version_tag = be64toh(tag); - /* Free any prior decoded config before overwriting the pointer */ - if (myconf->cluster_config) { - free_ClusterConfig(myconf->cluster_config); - free(myconf->cluster_config); - myconf->cluster_config = NULL; - } - - /* Decode Cap'n Proto directly into myconf->cluster_config */ - rc = load_cluster_config_from_file(myconf->conffile, - &myconf->cluster_config); + /* Decode Cap'n Proto into a LOCAL temporary first (bug-1476 fix part 2): + * decode_ClusterConfig_ptr calloc's and publishes its out-parameter + * pointer BEFORE decode_ClusterConfig populates the nested fields, so + * decoding directly into the shared myconf->cluster_config field would + * expose any other reader of that field to a live-but-incomplete + * object. Only a fully decoded and validated config is ever published + * below. */ + cluster_config_t *new_config = NULL; + rc = load_cluster_config_from_file(myconf->conffile, &new_config); if (rc != 0) { ERROR("Primary config '%s' failed Cap'n Proto decode: %d", myconf->conffile, rc); free(bytes); - free(myconf->conffile); - myconf->conffile = NULL; + mylock_unlock(&myconf->lock); return rc; } - if (myconf->cluster_config == NULL) { + if (new_config == NULL) { ERROR("Primary config '%s' decoded to NULL", myconf->conffile); free(bytes); - free(myconf->conffile); - myconf->conffile = NULL; + mylock_unlock(&myconf->lock); return -EINVAL; } free(bytes); - fill_default_cluster_config(myconf->cluster_config); + fill_default_cluster_config(new_config); /* Check for reserved lost_and_found name */ - if (config_contains_reserved_name(myconf->cluster_config)) { + if (config_contains_reserved_name(new_config)) { ERROR("Config '%s' contains reserved name 'lost_and_found'", myconf->conffile); - free_ClusterConfig(myconf->cluster_config); - free(myconf->cluster_config); - myconf->cluster_config = NULL; - free(myconf->conffile); - myconf->conffile = NULL; + free_ClusterConfig(new_config); + free(new_config); + mylock_unlock(&myconf->lock); return -EINVAL; } /* Default generation to 1 if not set */ - if (myconf->cluster_config->config_generation == 0) - myconf->cluster_config->config_generation = 1; - myconf->config_generation = myconf->cluster_config->config_generation; + if (new_config->config_generation == 0) + new_config->config_generation = 1; + myconf->config_generation = new_config->config_generation; + + /* Publish: retire the prior config only now that the new one is fully + * decoded and validated — myconf->cluster_config never points at a + * freed or partially-built object. */ + if (myconf->cluster_config) { +#ifdef XCE_TESTING + if (load_primary_config_race_hook) + load_primary_config_race_hook(); +#endif + free_ClusterConfig(myconf->cluster_config); + free(myconf->cluster_config); + } + myconf->cluster_config = new_config; /* Check staleness */ myconf->conf_stale = conf_check_stale(conf_dir, myconf->conf_stale_timeout); @@ -709,6 +749,7 @@ int load_primary_config(cluster_t *c) INFO("Primary config loaded: tag=%016" PRIx64 " gen=%" PRIu64, myconf->config_version_tag, myconf->config_generation); + mylock_unlock(&myconf->lock); return 0; } @@ -970,16 +1011,24 @@ int conf_check_stale(const char *workdir, time_t stale_timeout_s) /* ── conf_trim_old_versions ─────────────────────── */ typedef struct { - char name[NAME_MAX]; - time_t mtime; + char name[NAME_MAX]; + struct timespec mtime; /* st_mtim — nanosecond resolution. Trimming must + * not tie on second-granularity st_mtime: configs + * saved within the same second (rapid replication + * or unit tests) would sort as equal and leave the + * protected current slot as the only trim + * candidate — which the pointer-protection skips, + * so nothing ever gets pruned. */ } ver_entry_t; static int ver_entry_cmp_desc(const void *a, const void *b) { const ver_entry_t *ea = (const ver_entry_t *)a; const ver_entry_t *eb = (const ver_entry_t *)b; - if (eb->mtime > ea->mtime) return 1; - if (eb->mtime < ea->mtime) return -1; + if (eb->mtime.tv_sec != ea->mtime.tv_sec) + return (eb->mtime.tv_sec > ea->mtime.tv_sec) ? 1 : -1; + if (eb->mtime.tv_nsec != ea->mtime.tv_nsec) + return (eb->mtime.tv_nsec > ea->mtime.tv_nsec) ? 1 : -1; return 0; } @@ -1018,7 +1067,7 @@ void conf_trim_old_versions(const char *workdir, int keep_n) if (stat(full, &st) == 0) { strncpy(entries[n].name, e->d_name, NAME_MAX - 1); entries[n].name[NAME_MAX - 1] = '\0'; - entries[n].mtime = st.st_mtime; + entries[n].mtime = st.st_mtim; n++; } } @@ -1206,6 +1255,50 @@ int handle_config_request(cluster_t *c, endpoint_t *ep, xce_request_t *req) return rc2; } +#ifdef XCE_TESTING +void (*config_push_reply_send_hook)(uint64_t term, uint64_t version_tag, + int accepted) = NULL; +#endif + +/* send_config_push_reply: construct and send ReplConfigPushReply{accepted, + * version_tag, term} back to the primary over ep. Mirrors + * ha_send_wal_ack_reply_ex (ha.c, bug-1479) exactly: when + * config_push_reply_send_hook is set (XCE_TESTING), the hook is called with + * the built {term, version_tag, accepted} INSTEAD of sending over ep -- lets + * a unit test observe the reply payload without a live endpoint. + * version_tag is always the standby's OWN current config_version_tag (per + * repl_config_push_reply_s's documented semantics, "standby's current + * version tag after decision") -- not the pushed request's tag, so a reject + * correctly reports the unchanged local state. raft-adapter-conformance + * task 2.1 (Req 2.2, 2.3, 2.5, 7.4): every handle_repl_config_push outcome + * -- accept or reject -- sends exactly one explicit reply, never silence. */ +static void send_config_push_reply(cluster_t *c, endpoint_t *ep, + xce_request_t *req, int accepted) +{ + uint64_t term = (uint64_t)atomic_load_explicit(&c->ha.term, + memory_order_acquire); + uint64_t version_tag = c->myconf->config_version_tag; + +#ifdef XCE_TESTING + if (config_push_reply_send_hook) { + config_push_reply_send_hook(term, version_tag, accepted); + return; + } +#endif + + repl_config_push_reply_t reply_body = { + .accepted = accepted, + .version_tag = version_tag, + .term = term, + }; + xce_reply_t reply; + init_reply_by_req(&reply, req); + reply.status = 0; + reply.data_which = RequestReply_data_replconfigpushreplymsg; + reply.data.replconfigpushreplymsg = &reply_body; + xce_reply(ep, c->myhost, &reply); +} + /* ── handle_repl_config_push ──────────────────────────────────────────────── * * Standby handler for OPCode_replConfigPush sent by the primary. @@ -1215,13 +1308,17 @@ int handle_config_request(cluster_t *c, endpoint_t *ep, xce_request_t *req) * 2. Verify SHA-256 integrity * 3. Save to disk via conf_save_config * 4. Reload cluster_config in memory via load_primary_config - * 5. Send ReplConfigPushReply with accepted=1 + * 5. Send ReplConfigPushReply -- accepted=1 on success (including + * activation-deferred EAGAIN), accepted=0 on any reject (raft-adapter- + * conformance Req 2.2, 2.3, 2.5); every path sends exactly one reply, + * never silence. */ int handle_repl_config_push(cluster_t *c, endpoint_t *ep, xce_request_t *req) { if (req->body_which != Request_body_replconfigpushrequestmsg || !req->body.replconfigpushrequestmsg) { WARN("handle_repl_config_push: malformed request"); + send_config_push_reply(c, ep, req, /*accepted*/0); return -EINVAL; } @@ -1241,6 +1338,7 @@ int handle_repl_config_push(cluster_t *c, endpoint_t *ep, xce_request_t *req) if (!rcpr->raw_bytes || rcpr->raw_bytes_len == 0 || !rcpr->raw_sha256) { WARN("handle_repl_config_push: missing bytes or sha256 (tag=%016" PRIx64 ")", rcpr->version_tag); + send_config_push_reply(c, ep, req, /*accepted*/0); return -EINVAL; } @@ -1249,6 +1347,7 @@ int handle_repl_config_push(cluster_t *c, endpoint_t *ep, xce_request_t *req) SHA256(rcpr->raw_bytes, rcpr->raw_bytes_len, computed); if (memcmp(computed, rcpr->raw_sha256, 32) != 0) { WARN("handle_repl_config_push: SHA-256 mismatch — rejecting push"); + send_config_push_reply(c, ep, req, /*accepted*/0); return -EBADMSG; } @@ -1264,6 +1363,7 @@ int handle_repl_config_push(cluster_t *c, endpoint_t *ep, xce_request_t *req) rcpr->raw_sha256); if (rc != 0) { WARN("handle_repl_config_push: conf_save_config failed: %d", rc); + send_config_push_reply(c, ep, req, /*accepted*/0); return rc; } @@ -1281,17 +1381,10 @@ int handle_repl_config_push(cluster_t *c, endpoint_t *ep, xce_request_t *req) if (act_rc != 0 && act_rc != -EAGAIN) WARN("handle_repl_config_push: config_activate_committed rc=%d", act_rc); - /* ACK the primary */ - repl_config_push_reply_t reply_body = { - .accepted = 1, - .version_tag = c->myconf->config_version_tag, - }; - xce_reply_t reply; - init_reply_by_req(&reply, req); - reply.status = 0; - reply.data_which = RequestReply_data_replconfigpushreplymsg; - reply.data.replconfigpushreplymsg = &reply_body; - xce_reply(ep, c->myhost, &reply); + /* ACK the primary. -EAGAIN (activation deferred) is NOT a rejection -- + * the bytes were saved out-of-band successfully, so this still replies + * accepted=1 (raft-adapter-conformance Req 2.5, 7.5: unchanged). */ + send_config_push_reply(c, ep, req, /*accepted*/1); return 0; } @@ -1570,6 +1663,21 @@ int push_config_to_standbys(cluster_t *c, const uint8_t *bytes, size_t blen, /* ── handle_upgrade_config ──────────────────────── */ +/* Test-only seam (config-upgrade-snapshot task 7): fires in + * do_upgrade_config_with_bytes right after config_commit_change() succeeds + * -- the configuration-change marker has just reached the committed + * prefix, but materialization on every member (apply_committed_entry's + * WAL_CONFIG_MARKER case, persist.c) has not necessarily completed + * anywhere yet. This is exactly the window a later regression test needs a + * deterministic way to land a forced leadership change in (Requirements + * 4.3, 5.4, 6.3). NULL in production -- no behaviour change. Mirrors + * xce_snapshot_chunk_hook's shape. Declared extern in the test file (same + * pattern as xce_snapshot_chunk_hook). */ +#ifdef XCE_TESTING +int (*xce_upgrade_marker_committed_hook)(cluster_t *c, + uint64_t version_tag) = NULL; +#endif + /* * do_upgrade_config_with_bytes: core upgrade logic called after the raw * capnp bytes have been extracted from the wire via @@ -1586,7 +1694,12 @@ int push_config_to_standbys(cluster_t *c, const uint8_t *bytes, size_t blen, * 7. Push to standbys and wait for the majority-ACK barrier; on failure * reply with send_upgrade_error and return (no success ACK, no restart) * 8. ACK admin tool (success ⇔ majority-acked config) - * 9. Wait for in-flight checkpoint, then signal restart + * + * The function's job ends at step 8. Materialization of the new + * configuration on every member -- including this one -- happens + * asynchronously and independently via each member's own apply of the + * committed WAL_CONFIG_MARKER (apply_committed_entry, persist.c, + * config-upgrade-snapshot task 5). No restart is requested or required. */ static int do_upgrade_config_with_bytes(cluster_t *c, endpoint_t *ep, xce_request_t *req, @@ -1720,6 +1833,11 @@ static int do_upgrade_config_with_bytes(cluster_t *c, endpoint_t *ep, return rc; } +#ifdef XCE_TESTING + if (xce_upgrade_marker_committed_hook) + (void)xce_upgrade_marker_committed_hook(c, c->myconf->config_version_tag); +#endif + /* 8. ACK the admin tool (success ⇔ majority-acked config) */ upgrade_config_reply_t urep; memset(&urep, 0, sizeof(urep)); @@ -1734,41 +1852,13 @@ static int do_upgrade_config_with_bytes(cluster_t *c, endpoint_t *ep, reply.data.upgradeconfigreplymsg = &urep; xce_reply(ep, c->myhost, &reply); - /* NOTICE (bug-857, spec `.kiro/specs/config-upgrade-snapshot/`) — config - * upgrade MUST snapshot current state, not re-derive it per node. - * Today the upgrade commits the config-change marker, then each member - * RESTARTS and re-materializes its post-upgrade state by replaying its own - * pre-upgrade WAL under the NEW config (steps 9 + restart recovery). Replay - * is config-dependent (`lost_and_found` re-homes entities whose config - * entity vanished), so members can DIVERGE in materialized state after an - * upgrade. The fix: at the config-change marker's (term,lsn) boundary the - * controller must materialize a full ENTITY-BEARING state snapshot, embed - * the new config in it, and install that SAME snapshot on every member via - * the snapshot_transfer_s transport (install-before-activate, hash-verified) - * so post-upgrade state is identical by construction and no member - * re-derives it. HARD dependency: `entity-bearing-snapshots` (snapshots are - * a 16-byte LSN sentinel today; the entity payload does not exist yet). - * Until that lands, the per-node-replay path below is the interim behavior. */ - - /* 9. Wait for in-flight checkpoint (up to 30 s), then signal restart */ - struct timespec ckpt_start, ckpt_now; - clock_gettime(CLOCK_MONOTONIC, &ckpt_start); - while (atomic_load(&c->persist.checkpoint_in_progress)) { - usleep(10000); - clock_gettime(CLOCK_MONOTONIC, &ckpt_now); - if (ckpt_now.tv_sec - ckpt_start.tv_sec > 30) { - ERROR("Checkpoint did not complete within 30 s" - " -- restarting anyway"); - break; - } - } + /* Materialization now happens via apply_committed_entry's + * WAL_CONFIG_MARKER case (persist.c, config-upgrade-snapshot task 5) on + * every member's own apply of this marker -- no restart needed. */ INFO("Config upgraded to tag=%016" PRIx64 " gen=%" PRIu64 - " (acked=%d standbys) -- requesting restart", + " (acked=%d standbys)", c->myconf->config_version_tag, new_gen, acked); - atomic_store(&c->restart_requested, 1); - int stop_val = 1; - cbuf_put(&c->wbuf, &stop_val); return 0; } @@ -2359,19 +2449,50 @@ int ha_stream_wal_to_standby(endpoint_t *ep, const char *wal_path, * never sent on the live broadcast path either * (persist_wal_write_replicated rejects type==WAL_CHECKPOINT with * -EINVAL). Skip it entirely -- do not build/send a catchup entry - * and do not advance prev_streamed_lsn/prev_streamed_term, so the - * NEXT real entry's AppendEntries prev tuple chains to the last - * REAL entry before this gap, exactly matching what a standby that - * never records a checkpoint marker in its own log expects. - * Without this, a standby receiving one gets stuck retrying the - * same LSN forever (the receive-side guard correctly refuses it). */ - if (hdr.type == WAL_CHECKPOINT) { - free(locked_pbuf); - off += (uint32_t)(sizeof(hdr) + hdr.payload_len); - continue; - } + * for it. + * + * bug-1475 (fix): DO fall through to the SAME unconditional + * prev-tracker advance every other scanned entry gets below + * (the "for EVERY scanned entry" logic a few lines down) instead + * of special-casing a skip here. A standby's own current_lsn/ + * durable_floor ALSO advances past this exact LSN the moment it + * independently applies the SAME committed WAL_CONFIG_MARKER (any + * member that commits a marker immediately writes its own local + * checkpoint at the marker's own LSN+1, deterministically the + * SAME lsn on every member that has caught up through the + * marker) -- so the checkpoint's LSN is a real, held position on + * BOTH sides, not a gap. The OLD behavior (never advancing the + * tracker across it) under-counted the sender's prev_log_index by + * one for every checkpoint encountered, permanently diverging it + * from the receiver's own (now correctly co-tracked -- see + * ha_apply_term_entry_via_library's bug-1475 fix) log_len: the + * first post-checkpoint entry would spuriously "succeed" at the + * WRONG index, after which every following entry's prev_log_index + * permanently exceeded the receiver's true log length -- + * ae_reject_logmismatch forever, with the primary re-streaming + * the identical doomed range every heartbeat. Falling through + * here (falling to the same code path as every other entry) + * fixes the divergence at its source. + * + * bug-1475 follow-up: this tracker advance alone was NOT + * sufficient — persist_entry_term(p, checkpoint_lsn) (the term + * this tracker reads for prev_log_term) turned out to be + * TIME-DEPENDENT before a further persist.c fix: it correctly + * read absent (0) right after the checkpoint, but silently + * flipped to WAL_LEGACY_TERM (1) the instant this leader + * appended any LATER real entry (which has already happened by + * the time this streamer runs), because persist.c's term-index + * array growth zero-filled the checkpoint's never-explicitly- + * recorded gap slot and read that zero-fill back as present. A + * receiver that had not yet appended past its own checkpoint + * still (correctly) read 0 for the same LSN, so logOk's + * prev_log_term equality check mismatched (0 != 1) and rejected + * forever. Fixed with a TERM_INDEX_UNSET sentinel in persist.c + * (record_entry_term/entry_term_locked) that keeps a + * never-recorded slot reading absent permanently, independent of + * later growth — see TERM_INDEX_UNSET's comment there. */ - if (hdr.lsn > standby_lsn) { + if (hdr.lsn > standby_lsn && hdr.type != WAL_CHECKPOINT) { wal_catchup_entry_t *entry = calloc(1, sizeof(*entry)); if (!entry) { free(locked_pbuf); @@ -2543,8 +2664,14 @@ static int repl_ep_still_registered(replicator_t *r, repl_ep_t ep) return found; } -/* re-derive the replication target exactly as ha.c:2771-2776 / D6: - * target = max(committed_lsn, last_written), last_written = current_lsn - 1. */ +/* re-derive the replication target via the SAME pure function + * repl_ack_decode_and_dispatch (ha.c) uses, so this continuation path and + * the heartbeat decision path can never disagree on what a standby must + * catch up to (bug-1478: this function used to duplicate the raw + * max(committed_lsn, last_written) formula inline, independently of the + * ha.c call site the fix landed in — a local-only, never-replicated + * WAL_CHECKPOINT trailing an already-advancing committed_lsn permanently + * wedged catch-up here as well, via the exact same mechanism). */ static uint64_t catchup_derive_target(cluster_t *c) { uint64_t committed = atomic_load_explicit(&c->persist.committed_lsn, @@ -2554,7 +2681,7 @@ static uint64_t catchup_derive_target(cluster_t *c) ? c->persist.current_lsn - 1 : 0; pthread_mutex_unlock(&c->persist.lock); - return last_written > committed ? last_written : committed; + return ha_compute_repl_target_lsn(committed, last_written); } /* Invoke the catch-up streaming path for [standby_lsn+1, target]. Mirrors the diff --git a/src/controller/config_repl.h b/src/controller/config_repl.h index f4f1609..bef4faf 100644 --- a/src/controller/config_repl.h +++ b/src/controller/config_repl.h @@ -453,6 +453,29 @@ extern int (*xce_probe_config_tag_hook)(const char *host, uint16_t port, */ int load_primary_config_for_test(cluster_t *c); +/* + * load_primary_config_race_hook: test-only synchronization seam. See the + * doc comment at its definition (config_repl.c) for the exact semantics — + * it lets a unit test deterministically force two concurrent + * load_primary_config() calls for the SAME myconf_t through the race window + * bug-1476's live ASan heap-use-after-free crossed. Set by test + * infrastructure (test_config_repl.c) before the relevant tests run. + */ +extern void (*load_primary_config_race_hook)(void); + +/* + * config_push_reply_send_hook: test-only injection point for the outbound + * ReplConfigPushReply built by send_config_push_reply() (config_repl.c). + * When non-NULL, called with (term, version_tag, accepted) INSTEAD of + * building/sending the real reply over ep -- lets a unit test observe a + * config-push accept OR reject reply without a live endpoint + * (raft-adapter-conformance task 2.1, mirrors ha_wal_ack_send_hook / + * bug-1479). NULL in production. Set by test infrastructure + * (test_config_repl.c) before the relevant tests run. + */ +extern void (*config_push_reply_send_hook)(uint64_t term, uint64_t version_tag, + int accepted); + /* * push_ctx_t: exposed under XCE_TESTING so unit tests can construct * synthetic push contexts to drive wait_all_with_timeout_for_test(). diff --git a/src/controller/ha.c b/src/controller/ha.c index eb7f9fe..3771d9c 100644 --- a/src/controller/ha.c +++ b/src/controller/ha.c @@ -22,6 +22,7 @@ #include #include +#include /* Circular-include safety: cluster_def.h includes ha.h (include-guarded), * and ha.h only forward-declares cluster_t — no cycle. */ @@ -105,9 +106,408 @@ extern int config_serve_fenced(const cluster_t *c); * stale serve-fence (non-blocking ordq_put only). */ extern int config_schedule_activate_retry(cluster_t *c); +/* ── config-upgrade-snapshot task 6.1: Activation Fence ─────────────────── + * upgrade_materialization_verify (below) is a SEPARATE fence from the + * config-byte serve-fence above — see ha_state_t's upgrade_materialization_ + * fence field doc comment (ha.h) for the full "why a second fence" rationale. + * It reads the SAME committed-marker authority config_activate_committed + * itself reads. */ +extern int config_committed_marker(const cluster_t *c, uint64_t *version_tag, + uint8_t sha256_out[32]); + +/* upgrade_materialization_read_live_config_sha256 (config-upgrade-snapshot + * task 6.1, Req 3.2/3.4): resolve and hash THIS MEMBER'S CURRENTLY-ACTIVE + * config bytes fresh, right now — never a cached/frozen copy (in particular, + * never c->persist.cfgref_sha, which is only a snapshot-time REFERENCE + * captured at whatever moment the last checkpoint ran, not proof the bytes + * are still current this instant). + * + * DELIBERATE DESIGN CHOICE: this calls the same two already-PUBLIC + * config_repl.c entry points (conf_read_current_filename, conf_read_raw) + * that config_activate_committed's own local_config_sha256 helper uses + * internally, rather than re-deriving the //conf/current -> + * cluster.bin. resolution a third time (persist.c's + * read_active_config_bytes already duplicates that resolution inline once, + * with its own documented rationale for why persist.c specifically avoids a + * persist.c -> config_repl.c call edge). ha.c carries no such constraint — + * it already depends on config_repl.c directly for config_activate_ + * committed/config_serve_fenced/config_schedule_activate_retry/conf_read_raw + * above, so calling these two existing, already-public accessors here is + * in-boundary, ordinary integration along an established edge, not a new + * layering violation or a third duplicate implementation of path validation. + * + * Returns 0 with out_sha populated on success; -ENOENT when no local config + * bytes exist yet (benign — e.g. c->myconf unset, or no conf/current pointer + * written yet); another negative errno surfaces a genuine read/validation + * failure from the underlying calls. */ +static int upgrade_materialization_read_live_config_sha256(cluster_t *c, + uint8_t out_sha[32]) +{ + extern int conf_read_current_filename(const char *workdir, char *out, + size_t outsz); + extern int conf_read_raw(const char *conffile, uint8_t **bytes, + size_t *len); + + myconf_t *mc = c->myconf; + if (!mc || !mc->workdir || !mc->name) + return -ENOENT; + + /* effective_dir = workdir/name — must match conf_save_config's own path + * construction (config_repl.c) exactly, mirroring local_config_sha256. */ + char conf_dir[4096]; + snprintf(conf_dir, sizeof(conf_dir), "%s/%s", mc->workdir, mc->name); + + char fname[256] = {0}; + int rc = conf_read_current_filename(conf_dir, fname, sizeof(fname)); + if (rc != 0) + return -ENOENT; /* no local bytes yet — caller fences + retries */ + + char path[4352]; + snprintf(path, sizeof(path), "%s/conf/%s", conf_dir, fname); + + uint8_t *bytes = NULL; + size_t blen = 0; + rc = conf_read_raw(path, &bytes, &blen); + if (rc != 0) + return -ENOENT; + + SHA256(bytes, blen, out_sha); + free(bytes); + return 0; +} + +/* upgrade_materialization_verify (config-upgrade-snapshot task 6.1, Req 1.8, + * 3.2, 3.4): the Activation Fence's own verify function — mirrors + * config_activate_committed's exact shape (config_repl.c:304-377) for a + * DIFFERENT condition. config_serve_fence (config_repl.c) asks "do the + * locally-held config BYTES hash-match the committed marker?"; THIS fence + * asks "has THIS MEMBER'S OWN materialization (the upgrade-snapshot + * checkpoint, config-upgrade-snapshot task 5) actually completed for the + * CURRENT committed marker, with matching config bytes?" — a distinct, + * independently-trackable condition: bytes can already hash-match + * (config_serve_fence clear) while this member's own checkpoint for that + * exact marker has not run yet, e.g. immediately after a marker commits but + * before apply_committed_entry's WAL_CONFIG_MARKER case has actually fired + * and written a checkpoint. + * + * "Materialization complete" is determined via c->persist.cfgref_present / + * cfgref_tag / cfgref_sha — persist.c's scan_latest_committed_config_ref, + * invoked from EVERY checkpoint (persist_checkpoint_write_locked), stamps + * these fields with the latest committed WAL_CONFIG_MARKER as of that + * checkpoint. cfgref_present && cfgref_tag == marker_tag && cfgref_sha == + * marker_sha therefore means "some checkpoint on THIS member has already + * captured a reference to this exact committed marker" — materialization for + * it has happened. This is the SAME field config_committed_marker's own + * compaction fallback already reads (config_repl.c), so this is a read of an + * existing, already-correct signal, not a new one. + * + * That alone is not sufficient: the checkpoint's cfgref_sha is a REFERENCE + * captured AT CHECKPOINT TIME, not proof the bytes are STILL current right + * now (the WAL marker's raft-commit and the R7 config-push byte delivery are + * two independent channels with no strict ordering guarantee). So this + * function ALSO re-reads the live on-disk config bytes fresh on every call + * (never c->persist.cfgref_sha, never any other cached/embedded copy) via + * upgrade_materialization_read_live_config_sha256 (above), and hash-verifies + * that fresh read against the committed marker too. Both must hold for the + * fence to clear. + * + * Never exits/aborts on this condition (controller/CLAUDE.md's never-self- + * terminate invariant) — always fail loud + fence + stay alive + retriable, + * mirroring config_activate_committed exactly: logs loud only on the 0->1 + * fence transition (never spams on repeated failed retries), returns + * -EAGAIN on failure so the caller retries, clears + returns 0 on success. */ +int upgrade_materialization_verify(cluster_t *c) +{ + if (!c) + return -EINVAL; + + /* 1. The committed marker is the authority for the target upgrade. An + * absent marker (no configuration change has ever committed on this + * cluster, or the marker has not committed yet) is NOT a divergence — + * clear any stale fence and succeed, mirroring config_activate_ + * committed's own -ENOENT handling exactly. */ + uint64_t marker_tag = 0; + uint8_t marker_sha[32]; + int rc = config_committed_marker(c, &marker_tag, marker_sha); + if (rc == -ENOENT) { + atomic_store_explicit(&c->ha.upgrade_materialization_fence, 0, + memory_order_release); + return 0; + } + if (rc != 0) + return rc; /* -EINVAL / -EIO surfaced to the caller */ + + /* 2. Materialization-complete signal: has ANY checkpoint on THIS member + * already captured a reference to this EXACT committed marker? */ + bool materialized = c->persist.cfgref_present && + c->persist.cfgref_tag == marker_tag && + memcmp(c->persist.cfgref_sha, marker_sha, 32) == 0; + + /* 3. Hash-verify: re-read the LIVE, currently-active config bytes fresh + * on every attempt and compare against the committed marker. */ + uint8_t live_sha[32]; + int live_rc = upgrade_materialization_read_live_config_sha256(c, live_sha); + bool bytes_verified = (live_rc == 0) && + (memcmp(live_sha, marker_sha, 32) == 0); + + if (!materialized || !bytes_verified) { + int was = atomic_exchange_explicit(&c->ha.upgrade_materialization_fence, + 1, memory_order_acq_rel); + if (!was) + ERROR("upgrade materialization fence: committed config marker " + "tag=%016" PRIx64 " -- materialization %s " + "(cfgref_present=%d cfgref_tag=%016" PRIx64 "), live config " + "bytes %s (rc=%d) -- member's OWN upgrade-snapshot " + "materialization for this marker is INCOMPLETE or " + "MISMATCHED; member NON-SERVING and NON-PROMOTABLE under the " + "new configuration, staying alive and retrying " + "(config-upgrade-snapshot R1.8/3.2/3.4)", + marker_tag, materialized ? "captured" : "NOT YET captured", + c->persist.cfgref_present, c->persist.cfgref_tag, + bytes_verified ? "hash-match" : "do NOT hash-match", live_rc); + return -EAGAIN; + } + + atomic_store_explicit(&c->ha.upgrade_materialization_fence, 0, + memory_order_release); + INFO("upgrade materialization VERIFIED for committed config marker " + "tag=%016" PRIx64 " -- materialization complete, live config bytes " + "hash-verified", marker_tag); + return 0; +} + +/* upgrade_materialization_fenced: trivial atomic-read accessor — mirrors + * config_serve_fenced (config_repl.c:262-268) exactly, for the new + * independent fence. Pure atomic read (no I/O), safe on the election/ + * dispatch path. */ +int upgrade_materialization_fenced(const cluster_t *c) +{ + if (!c) + return 0; + return atomic_load_explicit(&c->ha.upgrade_materialization_fence, + memory_order_acquire) ? 1 : 0; +} + +/* ── config-upgrade-snapshot task 6.2: Activation Fence self-triggering retry ── + * Mirrors config_schedule_activate_retry's exact four-function shape + * (config_repl.c:409-507) for the upgrade_materialization_fence instead of + * config_serve_fence: a one-shot NON-BLOCKING delaymgr task offloads the + * actual blocking re-verify work (upgrade_materialization_verify's disk + * reads) onto a VTASK_LIVE_BLOCK vtask, so the delaymgr thread itself never + * blocks (ha-async-io.md thread-role contract). */ + +/* upgrade_materialization_retry_fn: re-runs upgrade_materialization_verify so + * a member whose materialization was incomplete or hash-mismatched re-checks + * and clears the fence once conditions allow. Does the actual blocking disk + * I/O; callers must invoke it off the delaymgr thread (see + * upgrade_materialization_retry_vtask_entry / + * schedule_upgrade_materialization_retry below). Public so tests can drive it + * directly without a vtask pool — mirrors config_activate_retry_fn. */ +int upgrade_materialization_retry_fn(void *arg) +{ + cluster_t *c = (cluster_t *)arg; + if (!c) + return -EINVAL; + if (!upgrade_materialization_fenced(c)) + return 0; /* already cleared by another path — nothing to retry */ + + int rc = upgrade_materialization_verify(c); + if (rc == 0) + INFO("upgrade materialization retry: fence CLEARED — this member's " + "own materialization for the committed config marker now " + "verified"); + else if (rc == -EAGAIN) + TRACE("upgrade materialization retry: still fenced (materialization " + "incomplete or hash-mismatched) — will retry on the next " + "commit advance"); + else + WARN("upgrade materialization retry: upgrade_materialization_verify " + "rc=%d", rc); + return rc; +} + +/* upgrade_materialization_retry_vtask_entry: vtask entry wrapping + * upgrade_materialization_retry_fn so its blocking disk I/O runs on a vtask + * worker, never inline on the single delaymgr thread. Mirrors + * config_activate_retry_vtask_entry. */ +static int upgrade_materialization_retry_vtask_entry(vtask_t *task) +{ + cluster_t *c = (cluster_t *)task->data->u.generic; + upgrade_materialization_retry_fn(c); + return 0; +} + +/* upgrade_materialization_retry_delaymgr_trampoline: the delaymgr task body. + * Delaymgr must only trigger + enqueue, never block — dispatch the actual + * retry work to a vtask (VTASK_LIVE_BLOCK, the same class + * config_activate_retry_delaymgr_trampoline uses) and return immediately. + * Fails loud and runs inline (stay alive, never silently drop a scheduled + * retry) if the pool is unavailable. Mirrors + * config_activate_retry_delaymgr_trampoline. */ +static int upgrade_materialization_retry_delaymgr_trampoline(void *arg) +{ + cluster_t *c = (cluster_t *)arg; + if (!c) + return -EINVAL; + + vtaskmgr_t *pool = &c->vtaskmgr; + vtask_data_t *data = calloc(1, sizeof(*data)); + vtask_t *task = vtask_alloc(); + + if (data == NULL || task == NULL) { + WARN("upgrade materialization retry: vtask alloc failed — running " + "inline (stay alive)"); + free(data); + free(task); + return upgrade_materialization_retry_fn(c); + } + + data->vtype = VTASK_GENERIC; + data->u.generic = c; + vtask_init(task, (vtask_func_t)upgrade_materialization_retry_vtask_entry, + data); + + if (vtask_enq_classified(pool, task, VTASK_LIVE_BLOCK) < 0) { + WARN("upgrade materialization retry: vtask enqueue failed — running " + "inline (stay alive)"); + free(data); + free(task); + return upgrade_materialization_retry_fn(c); + } + return 0; +} + +/* schedule_upgrade_materialization_retry: enqueue the retry trampoline on the + * delaymgr (NON-BLOCKING — delay_task_ms only does ordq_put; the trampoline + * itself offloads the blocking work to a vtask, see above). Called from the + * commit-advance path (iomgr ACK thread) so the retry's disk I/O runs OFF + * that thread (ha-async-io invariant). No-op when the member is NOT + * upgrade-materialization fenced (steady state schedules nothing) or when + * the delaymgr is not running (the unit-test fixture path, which never inits + * delaymgr — avoids leaking a task into an un-drained queue). Mirrors + * config_schedule_activate_retry exactly. Returns 0 on enqueue/no-op, + * negative on enqueue failure. */ +int schedule_upgrade_materialization_retry(cluster_t *c) +{ + if (!c) + return -EINVAL; + if (!upgrade_materialization_fenced(c)) + return 0; /* steady state: nothing to retry, schedule nothing */ + if (!c->delaymgr.running) + return 0; /* delaymgr not running (test fixture) — caller drives directly */ + + /* One-shot, minimal delay: run promptly but off the iomgr ACK thread. */ + int rc = delay_task_ms(&c->delaymgr, 1, 1, + (delay_task_entry_fn_t)upgrade_materialization_retry_delaymgr_trampoline, + c); + if (rc < 0) + WARN("upgrade materialization retry: delay_task_ms failed: %d — " + "fence will clear on a later commit advance", rc); + return rc; +} + +/* ha_phase2_retry_fn / ha_phase2_retry_vtask_entry / + * ha_phase2_retry_delaymgr_trampoline / ha_schedule_phase2_retry (bug-1477): + * see the doc comments in ha.h. Structurally identical to + * upgrade_materialization_retry_fn's own 3-layer shape (blocking retry_fn -> + * vtask entry -> delaymgr trampoline) just above, except the trampoline + * re-arms itself on failure since nothing else recurring would otherwise + * ever retry cluster_init_phase2 for a node stuck on myapp_run's passive + * skip_election path. */ +int ha_phase2_retry_fn(void *arg) +{ + cluster_t *c = (cluster_t *)arg; + if (!c) + return -EINVAL; + if (c->ha.phase2_done) + return 0; /* already done by another path -- nothing to retry */ + + int rc; +#ifdef XCE_TESTING + rc = (ha_phase2_hook != NULL) ? ha_phase2_hook(c) : 0; +#else + rc = cluster_init_phase2(c); +#endif + if (rc == 0) { + c->ha.phase2_done = 1; + INFO("HA: cluster_init_phase2 retry succeeded — commit engine now " + "wired (bug-1477)"); + } else { + WARN("HA: cluster_init_phase2 retry rc=%d — member stays alive and " + "will retry again (bug-1477, never self-terminate)", rc); + ha_schedule_phase2_retry(c); + } + return rc; +} + +static int ha_phase2_retry_vtask_entry(vtask_t *task) +{ + cluster_t *c = (cluster_t *)task->data->u.generic; + ha_phase2_retry_fn(c); + return 0; +} + +static int ha_phase2_retry_delaymgr_trampoline(void *arg) +{ + cluster_t *c = (cluster_t *)arg; + if (!c) + return -EINVAL; + + vtaskmgr_t *pool = &c->vtaskmgr; + vtask_data_t *data = calloc(1, sizeof(*data)); + vtask_t *task = vtask_alloc(); + + if (data == NULL || task == NULL) { + WARN("HA: cluster_init_phase2 retry: vtask alloc failed — running " + "inline (stay alive)"); + free(data); + free(task); + return ha_phase2_retry_fn(c); + } + + data->vtype = VTASK_GENERIC; + data->u.generic = c; + vtask_init(task, (vtask_func_t)ha_phase2_retry_vtask_entry, data); + + if (vtask_enq_classified(pool, task, VTASK_LIVE_BLOCK) < 0) { + WARN("HA: cluster_init_phase2 retry: vtask enqueue failed — running " + "inline (stay alive)"); + free(data); + free(task); + return ha_phase2_retry_fn(c); + } + return 0; +} + +int ha_schedule_phase2_retry(cluster_t *c) +{ + if (!c) + return -EINVAL; + if (c->ha.phase2_done) + return 0; /* steady state: nothing to retry, schedule nothing */ + if (!c->delaymgr.running) + return 0; /* delaymgr not running (test fixture) — caller drives directly */ + + uint32_t interval_ms = c->ha.config.heartbeat_interval_ms; + if (interval_ms == 0) + interval_ms = HA_DEFAULT_HEARTBEAT_INTERVAL_MS; + + int rc = delay_task_ms(&c->delaymgr, (int)interval_ms, 1, + (delay_task_entry_fn_t)ha_phase2_retry_delaymgr_trampoline, + c); + if (rc < 0) + WARN("HA: cluster_init_phase2 retry: delay_task_ms failed: %d — " + "will retry on the next natural re-trigger", rc); + return rc; +} + static void on_vote_connected(endpoint_t *ep); static void on_pre_vote_connected(endpoint_t *ep); static int vote_ep_err_handler(void *ep_raw); +/* raft-adapter-conformance task 3.1: PreVote's own on_err handler, registered + * at raft_cb_send_pre_vote_request's endpoint-setup call site (mirrors the + * real-vote vote_ep_err_handler forward-declared above). */ +static int pre_vote_ep_err_handler(void *ep_raw); /* bug-1423: forward-declared so raft_cb_send_vote_request's connect/monitor * failure branches can route a synthetic "no vote" reply through the SAME * production path a real reply uses (see vote_reply_dispatch's own comment, @@ -428,7 +828,7 @@ static int raft_cb_send_pre_vote_request(void *ctx, int peer_idx, } endpoint_set_on_connected(ep, on_pre_vote_connected); - endpoint_set_err_handler(ep, vote_ep_err_handler); + endpoint_set_err_handler(ep, pre_vote_ep_err_handler); endpoint_set_on_fini(ep, vote_ep_on_fini); int rc = endpoint_connect(ep, peer->hostname, peer->port, @@ -1439,18 +1839,64 @@ static void raft_cb_become_leader(void *ctx, uint64_t term) return; /* do NOT become CTRL_PRIMARY; never self-exit */ } + /* ── config-upgrade-snapshot task 6.2 (Req 1.8, 3.2, 3.3, 4.3, 5.5): + * Activation Fence promotion gate ────────────────────────────────────── + * A member whose OWN upgrade-snapshot materialization for the current + * committed config marker has not completed and hash-verified must not + * become authoritative CTRL_PRIMARY — doing so would let it win an + * election (Raft's log-freshness gate only proves it has the committed + * MARKER, not that it has finished MATERIALIZING under it) and then + * immediately violate the serving gate above the moment it starts + * accepting requests. This is a SEPARATE, SEQUENTIAL check from the + * config serve-fence directly above (same rationale as the dispatch-gate + * composition: byte-mismatch and materialization-incomplete are distinct + * conditions) — never a new promotion-eligibility mechanism for WAL/log + * completeness (Req 3.1 is explicit that Raft's own freshness gate + * already owns that; this fence is layered on top, purely about + * materialization completeness). Refuse promotion and STAY ALIVE + * (controller-never-self-terminate): the member remains non-promotable + * and keeps retrying (schedule_upgrade_materialization_retry, driven off + * the commit-advance path); once its own materialization completes and + * re-verify clears the fence, a later promotion attempt passes this + * gate. Pure atomic read (no I/O) — safe on the election path. */ + if (upgrade_materialization_fenced(c)) { + WARN("HA: promotion REFUSED — upgrade materialization FENCED (this " + "member's own upgrade-snapshot materialization for the " + "committed config marker is incomplete or hash-mismatched); " + "member stays ALIVE, non-promotable, retrying materialization " + "(config-upgrade-snapshot Req 1.8/3.2/3.3/4.3/5.5)"); + return; /* do NOT become CTRL_PRIMARY; never self-exit */ + } + int is_first_boot = !ha->phase2_done; /* First boot: call cluster_init_phase2 */ if (is_first_boot) { + int p2rc = 0; #ifdef XCE_TESTING if (ha_phase2_hook != NULL) - ha_phase2_hook(c); + p2rc = ha_phase2_hook(c); #else if (c != NULL) - cluster_init_phase2(c); + p2rc = cluster_init_phase2(c); #endif - ha->phase2_done = 1; + if (p2rc == 0) { + ha->phase2_done = 1; + } else { + /* bug-1477: do NOT latch phase2_done on failure, and do NOT + * proceed to CTRL_PRIMARY with an unwired commit engine — mirror + * the upgrade_materialization_fenced refusal just above (stay + * ALIVE, non-promotable, retry; a later promotion attempt + * succeeds once ha_schedule_phase2_retry completes). Before this + * fix, phase2_done was latched unconditionally, so this failure + * path never existed for the code below to worry about. */ + WARN("HA: promotion REFUSED — cluster_init_phase2 failed " + "(rc=%d); member stays ALIVE, non-promotable, retrying " + "(bug-1477, never self-terminate)", p2rc); + if (c != NULL) + ha_schedule_phase2_retry(c); + return; /* do NOT become CTRL_PRIMARY with an unwired commit engine */ + } /* bug-1445 fix: cluster_init_phase2() above just ran this process's * very FIRST persist_recover()/replay_wal() -- the ONLY thing that @@ -1671,14 +2117,26 @@ static void raft_cb_become_follower(void *ctx, uint64_t term, int leader_idx) /* First boot: call cluster_init_phase2 so structures are ready */ if (is_first_boot) { + int p2rc = 0; #ifdef XCE_TESTING if (ha_phase2_hook != NULL) - ha_phase2_hook(c); + p2rc = ha_phase2_hook(c); #else if (c != NULL) - cluster_init_phase2(c); + p2rc = cluster_init_phase2(c); #endif - ha->phase2_done = 1; + if (p2rc == 0) { + ha->phase2_done = 1; + } else { + /* bug-1477: do NOT latch phase2_done on failure — a standby + * (unlike a promoted primary) can safely stay passive while + * ha_schedule_phase2_retry retries; nothing below depends on + * phase2 having succeeded. */ + WARN("HA: cluster_init_phase2 on become-follower failed (rc=%d) " + "— member stays alive, will retry (bug-1477)", p2rc); + if (c != NULL) + ha_schedule_phase2_retry(c); + } } /* Close all outgoing vote endpoints (loser path). @@ -2075,12 +2533,68 @@ static int ha_read_wal_entry_at(const char *wal_path, uint64_t lsn, * Non-blocking (ha-async-io): delegates to repl_send_append_entries which * enqueues via the async repl transport — never blocks in the callback. * peer_idx is the library's raft peer index, mapped 1:1 to the repl standby - * registry slot (the same index match_index/next_index use). */ + * registry slot (the same index match_index/next_index use). + * + * DORMANT IN PRODUCTION (raft-adapter-conformance task 4.1, Requirement 3.3): + * this callback is wired as on_send_append_entries (see s_real_cbs below) and + * is fully protocol-conformant, but it is reachable ONLY via the raft + * library's raft_send_append_entries (src/lib/raft/raft.c:595), which has + * ZERO production call sites — every caller is either + * src/lib/raft/raft_sim.c (the pure library simulation harness) or the + * XCE_TESTING-only test helper ha_cb_send_append_entries_for_test (below). + * Nothing in the running controller ever DRIVES raft_send_append_entries, so + * this callback is registered but never invoked in production. + * + * The mechanism that ACTUALLY drives AppendEntries-equivalent + * send/retry/backoff in production today is a different, coarser + * substitute: repl_broadcast (src/controller/repl.c) fans out each + * freshly-appended WAL entry to every standby as it is written (retrying via + * ha_raft_on_repl_nack on a NACK), and ha_stream_wal_to_standby + * (src/controller/config_repl.c) streams a standby's catch-up range once it + * falls behind. Together these two are the sole production + * AppendEntries-equivalent send/retry/backoff mechanism for Requirement 3.3 + * — NOT this per-peer, nextIndex-driven sender. + * + * This is a deliberate documentation-only resolution, not an oversight: see + * research.md's "Documentation-only resolution for the dead nextIndex-driven + * AppendEntries sender (Requirement 3)" decision and + * src/controller/CLAUDE.md's TLA+ Action-to-Code Mapping for the recorded + * disposition. The dead path is kept as an intentionally-dormant, + * protocol-exact reference implementation (retiring or wiring it in were + * both rejected — see research.md) rather than silently left undocumented. + * Its dormancy is guarded against silent regression by the XCE_TESTING-only + * ha_send_append_entries_stub_call_count counter incremented immediately + * below: a future change that accidentally gives raft_send_append_entries a + * production caller moves this counter off zero, which task 4.2's + * non-regression test (test_ha_core_safety.c) asserts against while + * confirming repl_broadcast/ha_stream_wal_to_standby fire for the same + * scenario. + * + * See also the independently-derived reachability trace at + * test_ha_core_safety.c:2436-2464 and the ha_apply_single_entry comment + * above (raft-ha-core-safety task 6.2), which confirm the same + * zero-production-caller finding for this function's only caller + * (repl_send_append_entries). */ +#ifdef XCE_TESTING +/* ha_send_append_entries_stub_call_count (raft-adapter-conformance task 4.1, + * Requirement 3.3): non-regression guard counting invocations of + * ha_cb_send_append_entries_stub (the on_send_append_entries callback). + * Expected to stay at 0 across any test that drives only the production + * replication path (repl_broadcast / ha_stream_wal_to_standby) — see the + * DORMANT IN PRODUCTION comment above. External linkage under XCE_TESTING + * only, so a test can read/reset it directly (declared extern in ha.h, + * mirroring the ha_wal_ack_send_hook seam). NULL/0 semantics: always 0 in a + * production build (the whole symbol does not exist outside XCE_TESTING). */ +uint64_t ha_send_append_entries_stub_call_count = 0; +#endif static int ha_cb_send_append_entries_stub(void *ctx, int peer_idx, uint64_t prev_log_index, uint64_t prev_log_term, uint64_t leader_commit, int n_entries) { +#ifdef XCE_TESTING + ha_send_append_entries_stub_call_count++; +#endif ha_state_t *ha = (ha_state_t *)ctx; if (!ha || !ha->raft_c) return -EINVAL; /* test mode without a cluster: cannot send */ @@ -2196,6 +2710,20 @@ static void ha_cb_commit_advanced_stub(void *ctx, uint64_t commit_index) * commit advance. */ if (config_serve_fenced(ha->raft_c)) config_schedule_activate_retry(ha->raft_c); + + /* config-upgrade-snapshot task 6.2 (Req 3.4, 5.5): symmetric commit- + * advance trigger for the Activation Fence. Materialization technically + * completes on APPLY (persist.c's WAL_CONFIG_MARKER case), which lags + * commit under raft-apply-decoupling — this hook does not need to fire + * at the PRECISE instant materialization becomes possible, only to + * eventually re-check and clear the fence once conditions allow (Req + * 3.4/5.5's "keep retrying" framing, not a precise event-driven + * guarantee). Commit advancing is a reasonable, precedented "something + * changed, worth re-checking" signal, and schedule_upgrade_materialization_ + * retry itself is a no-op when unfenced, so this adds no busy-spin in the + * steady state. */ + if (upgrade_materialization_fenced(ha->raft_c)) + schedule_upgrade_materialization_retry(ha->raft_c); } static const raft_callbacks_t s_real_cbs = { @@ -2613,19 +3141,36 @@ static int ha_apply_single_entry(persist_t *p, wal_catchup_entry_t *e) return 0; } -/* ha_send_wal_ack_reply: send WalAckReply {term, lsn, success=1} back to - * the primary over ep. Skipped when ep or c is NULL (test/offline path). - * Task 3.1 (ha-wal-replication): ACK each successfully applied WAL entry. */ -static void ha_send_wal_ack_reply(ha_state_t *ha, struct endpoint_t *ep, - cluster_t *c, uint64_t lsn) +#ifdef XCE_TESTING +void (*ha_wal_ack_send_hook)(uint64_t term, uint64_t lsn, int success) = NULL; +#endif + +/* ha_send_wal_ack_reply_ex: send WalAckReply {term, lsn, success} back to + * the primary over ep. Skipped when ep or c is NULL (test/offline path), + * unless ha_wal_ack_send_hook is set (XCE_TESTING), in which case the hook is + * called with the built {term, lsn, success} INSTEAD of sending over ep -- + * lets a unit test observe a NACK (success=0) without a live endpoint + * (bug-1479). Task 3.1 (ha-wal-replication): ACK/NACK each applied/rejected + * WAL entry. */ +static void ha_send_wal_ack_reply_ex(ha_state_t *ha, struct endpoint_t *ep, + cluster_t *c, uint64_t lsn, int success) { + uint64_t term = (uint64_t)atomic_load_explicit(&ha->term, memory_order_acquire); + +#ifdef XCE_TESTING + if (ha_wal_ack_send_hook) { + ha_wal_ack_send_hook(term, lsn, success); + return; + } +#endif + if (!ep || !c) return; wal_ack_reply_t ack; - ack.term = (uint64_t)atomic_load_explicit(&ha->term, memory_order_acquire); + ack.term = term; ack.lsn = lsn; - ack.success = 1; + ack.success = success ? 1 : 0; xce_reply_t reply; memset(&reply, 0, sizeof(reply)); @@ -2637,6 +3182,14 @@ static void ha_send_wal_ack_reply(ha_state_t *ha, struct endpoint_t *ep, xce_reply(ep, c->myhost, &reply); } +/* ha_send_wal_ack_reply: send a successful WalAckReply {term, lsn, + * success=1} -- the common case, every existing call site. */ +static void ha_send_wal_ack_reply(ha_state_t *ha, struct endpoint_t *ep, + cluster_t *c, uint64_t lsn) +{ + ha_send_wal_ack_reply_ex(ha, ep, c, lsn, /*success*/1); +} + /* ha_apply_term_entry_via_library: route ONE term-carrying replicated entry * (a live broadcast or a catch-up sub-entry) through the raft library * (raft_on_append_entries_request via ha_consume_append_entries) so the LIBRARY @@ -2652,6 +3205,64 @@ static int ha_apply_term_entry_via_library(ha_state_t *ha, persist_t *p, cluster_t *c, struct endpoint_t *ep, wal_catchup_entry_t *e) { + /* bug-1475 / bug-1466: resync the raft library's log_len from this node's + * OWN recovered/durable WAL tip before consuming the AE, exactly mirroring + * ha_sync_raft_log_from_recovery's boot-time computation (persist_durable_ + * floor), but applied live, JUST-IN-TIME, on this same single AE-receive + * call path — never touching persist.c or adding any new cross-thread + * mutation of ha->raft (ha_apply_wal_catchup_entry / this function already + * own that field on this thread, same as every other s->log_len write in + * the AE-receive path below). + * + * Root cause: persist_write_checkpoint_marker (a LOCAL-only, never- + * replicated WAL_CHECKPOINT entry written by ANY role — primary or + * standby — whenever a committed WAL_CONFIG_MARKER triggers an immediate + * checkpoint) advances persist_t's current_lsn directly, WITHOUT going + * through raft_log_append — so s->log_len silently falls one behind the + * true physical WAL tip for every checkpoint written since the last + * resync (documented gap, bug-1466). Once behind, the very next AE for + * the entry immediately following the checkpoint carries a prev_log_index + * equal to the checkpoint's own LSN (config_repl.c's streamer correctly + * advances its tracker across the skipped checkpoint) — but a stale + * s->log_len makes logOk's `prev_log_index <= s->log_len` bound fail + * forever, permanently wedging this standby's catch-up (every subsequent + * heartbeat re-streams the identical doomed range with zero progress). + * + * persist_durable_floor is a lock-free atomic read of durable_lsn (the + * flusher's own fsync-confirmed watermark, which DOES count a checkpoint's + * consumed LSN slot, same as at boot) — safe to call from any thread. The + * write below (raising ha->raft.log_len) happens on the same thread that + * already owns every other s->log_len mutation in this call chain + * (raft_on_append_entries_request), so no new lock is introduced. + * Monotonic: only ever raises log_len, mirroring + * ha_sync_raft_log_from_recovery exactly. Deliberately does NOT touch the + * term index (on_get_entry_term(checkpoint_lsn) stays 0/absent on every + * member, by design — see persist_write_checkpoint_marker's own comment) + * — recording a synthetic term here would risk a cross-member mismatch + * (each member's checkpoint stamps ITS OWN current term at write time, + * which need not agree with a peer's), whereas leaving it absent keeps + * the logOk equality check (0==0) trivially and SAFELY consistent on + * every member. + * + * bug-1475 follow-up: the "stays absent on every member" claim above only + * holds because persist.c's term index now uses a TERM_INDEX_UNSET + * sentinel to keep a never-explicitly-recorded LSN (like a checkpoint's) + * reading back absent PERMANENTLY. Before that fix, persist.c's array- + * growth zero-fill silently reclassified the checkpoint's gap slot as + * present-with-WAL_LEGACY_TERM the instant any LATER lsn was recorded — + * which happens immediately on the sender (it streams after its own + * later entries exist) but not yet on a receiver that hasn't appended + * past its own checkpoint, so the two sides read DIFFERENT terms for the + * SAME checkpoint LSN and logOk permanently rejected. See + * TERM_INDEX_UNSET's comment (persist.c) and + * test_bug1475_catchup_survives_midstream_checkpoint (test_config_repl.c) + * for the full mechanism and live-instrumentation evidence. */ + if (p) { + uint64_t recovered_tip = persist_durable_floor(p); + if (recovered_tip > ha->raft.log_len) + ha->raft.log_len = recovered_tip; + } + /* Wrap the single entry in an AE container whose TOP-LEVEL fields carry the * prev tuple + term that ha_consume_append_entries reads, with entries[0] * pointing at the entry itself (the same shape repl_send_append_entries / @@ -2701,8 +3312,18 @@ static int ha_apply_term_entry_via_library(ha_state_t *ha, persist_t *p, ha_send_wal_ack_reply(ha, ep, c, e->lsn); return 1; } - /* logOk reject (e.g. forward gap before the prefix arrives): no ACK; the - * ACK-driven catch-up continuation re-streams from current_lsn in order. */ + /* logOk reject (e.g. forward gap before the prefix arrives, or a genuine + * (term,lsn) conflict): bug-1479 -- send a NACK (success=0) so the + * primary's ha_raft_on_repl_nack can back off nextIndex and immediately + * mark this standby for catch-up, matching raft.tla's AppendEntries + * action (the receiver ALWAYS replies, success = logOk). Before this fix + * NOTHING was sent on reject: the primary's NACK-handling branch + * (repl_ack_decode_and_dispatch) was correct but unreachable, since no + * production path ever produced the success=0 reply it was waiting for + * -- the standby would loop rejecting the identical re-broadcast entry + * forever, discovered live via the config-upgrade soak's force-elect + * rotation. */ + ha_send_wal_ack_reply_ex(ha, ep, c, e->lsn, /*success*/0); return 0; } @@ -3144,10 +3765,12 @@ int ha_handle_snapshot_chunk(ha_state_t *ha, persist_t *p, * rather than silently surviving the install. Applies identically to * both a legacy (position-only) and an entity-bearing checkpoint — the * term reconcile is orthogonal to entity content. chunk->checkpoint_term - * == 0 means a legacy sender never stamped the wire field; persist's - * existing legacy-0 -> WAL_LEGACY_TERM convention (applied uniformly at - * read-back by persist_entry_term) already covers that case, so no - * special-casing is needed here. */ + * == 0 is unambiguous and means the checkpoint LSN is genuinely absent + * from the sender's own term index, never "legacy term 0, present" + * (bug-1475 Finding 2 — see persist_reconcile_checkpoint_term's own doc + * comment, persist.h). persist_reconcile_checkpoint_term itself + * special-cases a wire 0 to TERM_INDEX_UNSET before recording, so the + * receiver reads this LSN back as absent too, matching the sender. */ persist_reconcile_checkpoint_term(p, chunk->snapshot_lsn, chunk->checkpoint_term); @@ -3269,6 +3892,66 @@ void ha_process_standby_state(ha_state_t *ha, int peer_idx, } } +/* + * ha_compute_repl_target_lsn: the replication/convergence target that + * ha_dispatch_repl_action_for_standby's heartbeat-driven decision compares + * every standby's reported applied_lsn against. + * + * The correct target is simply the real, raft/commit-engine-authoritative + * committed_lsn — the only position a standby can safely (and eventually) + * be told it must catch up to. The ONE documented exception is cluster + * BOOTSTRAP: when committed_lsn is genuinely stuck at 0 (no standby has ever + * acked anything yet, so the commit engine's majority computation has never + * had anything to advance against), last_written (the raw locally-appended + * WAL tip) is used instead, so a first-ever connecting standby is told to + * catch up to real data instead of being handed "nothing to stream". + * + * bug-1478: this fallback must apply ONLY in that committed_lsn==0 bootstrap + * case — NOT unconditionally whenever last_written happens to exceed + * committed_lsn. last_written (persist.current_lsn - 1) counts EVERY + * locally-appended WAL entry, including a local-only, NEVER-replicated + * WAL_CHECKPOINT (persist_write_checkpoint_marker bumps current_lsn + * directly, bypassing raft_log_append/the commit engine entirely — the + * same architectural gap flagged in bug-1466). Once such a checkpoint + * trails an already-advancing (non-zero) committed_lsn, last_written + * permanently sits one LSN past it — and since a checkpoint's own consumed + * LSN slot is, by design, never streamed or applied by any standby + * (ha_stream_wal_to_standby / persist_wal_write_replicated / + * persist_wal_async all explicitly refuse WAL_CHECKPOINT), no standby's + * applied_lsn can EVER legitimately reach that value. Taking the + * max(committed_lsn, last_written) unconditionally turned the bootstrap + * convenience into a permanent, unsatisfiable catch-up target for every + * standby the instant a marker-triggered checkpoint (config-upgrade- + * snapshot task 5) or a periodic WAL-threshold checkpoint interleaves ahead + * of the next real committed advance — ha_evaluate_repl_action's + * standby_lsn < committed_lsn check then never reaches HA_REPL_CONVERGED, + * and ha_stream_wal_to_standby is re-invoked every heartbeat forever, + * finding nothing new to send each time (bug-1478). + * + * Pure, side-effect-free — safe to unit test directly. + */ +uint64_t ha_compute_repl_target_lsn(uint64_t committed_lsn, + uint64_t last_written) +{ + if (committed_lsn == 0 && last_written > 0) + return last_written; + return committed_lsn; +} + +/* bug-1479 (gap 3): see full doc comment in ha.h. Distinct from + * ha_compute_repl_target_lsn above (the CONVERGENCE target) -- this is the + * STREAM ceiling: how far a leader may actually push WAL to a standby, which + * must extend past committed_lsn or a standby whose own ack is required to + * advance committed_lsn can never receive the entries it needs to ack. */ +uint64_t ha_compute_repl_stream_ceiling_lsn(uint64_t committed_lsn, + uint64_t last_written, + uint64_t checkpoint_lsn) +{ + if (last_written == checkpoint_lsn && last_written > committed_lsn) + last_written = committed_lsn; + return (last_written > committed_lsn) ? last_written : committed_lsn; +} + /* ─────────────────────────────────────────────────────────────────────── * raft-drive-async Task 3.2 — SnapshotSend slow-lane offload (bug-1198). * @@ -3659,8 +4342,38 @@ int ha_dispatch_repl_action_for_standby(ha_state_t *ha, uint64_t standby_tag = ha->standby_reported_tag[peer_idx]; uint64_t standby_lsn = ha->standby_reported_lsn[peer_idx]; + /* bug-1479: a standby marked in_catch_up (via ha_raft_on_repl_nack's + * immediate trigger on log-conflict rejection, or repl_broadcast's + * MAX_PENDING_ACKS eviction) can never correct its OWN self-reported + * standby_reported_lsn — it's stuck rejecting every AppendEntries, so it + * never sends a stateReport reflecting genuine progress. Use the + * corrected join_applied_lsn instead: this heartbeat-driven cycle (runs + * every heartbeat_interval_ms regardless of ACK/reject outcome) becomes + * the actual catch-up driver for this case — the ACK-driven continuation + * (ha_walack_on_ack, config_repl.c) can only fire on a REAL ack, which a + * log-conflicted standby can never produce until streamed from the + * corrected position at least once. */ + if (c) { + uint64_t join_lsn; + if (repl_get_catchup_join_lsn(&c->persist.repl, ep, &join_lsn)) + standby_lsn = join_lsn; + } + + /* bug-1479 (gap 3): stream (and evaluate convergence against) the + * leader's own log tail, not just committed_lsn -- see + * ha_compute_repl_stream_ceiling_lsn's doc comment (ha.h) for why capping + * at committed_lsn is a permanent deadlock whenever this exact standby's + * own ack is required to advance committed_lsn in the first place. */ + uint64_t stream_ceiling_lsn = committed_lsn; + if (c) { + uint64_t last_written = (c->persist.current_lsn > 0) + ? c->persist.current_lsn - 1 : 0; + stream_ceiling_lsn = ha_compute_repl_stream_ceiling_lsn( + committed_lsn, last_written, c->persist.checkpoint_lsn); + } + ha_repl_action_t action = ha_evaluate_repl_action(standby_tag, standby_lsn, - committed_tag, committed_lsn, + committed_tag, stream_ceiling_lsn, oldest_wal_lsn); switch (action) { @@ -3709,16 +4422,19 @@ int ha_dispatch_repl_action_for_standby(ha_state_t *ha, case HA_REPL_STREAM_WAL: /* Task 3.4: batch WAL streaming. * Enqueues all batch OPCode_walCatchupEntry messages for the range - * [standby_lsn+1, committed_lsn] via ha_stream_wal_to_standby(). + * [standby_lsn+1, stream_ceiling_lsn] via ha_stream_wal_to_standby() + * (bug-1479 gap 3: the ceiling extends past committed_lsn to the + * leader's own log tail — see ha_compute_repl_stream_ceiling_lsn). * All xce_request() calls are non-blocking (enqueue-only). */ INFO("HA repl: standby[%d] lsn=%" PRIu64 - " < committed_lsn=%" PRIu64 " → stream WAL batches", - peer_idx, standby_lsn, committed_lsn); + " < stream_ceiling_lsn=%" PRIu64 " (committed_lsn=%" PRIu64 + ") → stream WAL batches", + peer_idx, standby_lsn, stream_ceiling_lsn, committed_lsn); #ifdef XCE_TESTING if (ha_repl_stream_wal_hook != NULL) { const char *wal_path = (c && c->persist.wal_path[0]) ? c->persist.wal_path : ""; - ha_repl_stream_wal_hook(ep, wal_path, standby_lsn, committed_lsn); + ha_repl_stream_wal_hook(ep, wal_path, standby_lsn, stream_ceiling_lsn); break; } #endif @@ -3737,7 +4453,7 @@ int ha_dispatch_repl_action_for_standby(ha_state_t *ha, uint64_t leader_term = atomic_load_explicit(&c->ha.term, memory_order_acquire); ha_stream_wal_to_standby(ep, c->persist.wal_path, &c->persist, - leader_term, standby_lsn, committed_lsn); + leader_term, standby_lsn, stream_ceiling_lsn); } break; @@ -3848,6 +4564,48 @@ int ha_dispatch_gate(ha_state_t *ha, int opcode) return -XCE_ERR_NOT_READY; } } + /* config-upgrade-snapshot task 6.2 (Req 3.2, 3.3, 5.5): the Activation + * Fence is a SEPARATE, SEQUENTIAL check composed alongside the + * config-byte serve-fence above, not merged into it — the two + * conditions are logically distinct (byte-mismatch vs. this member's + * own materialization-incomplete) per design.md's Activation Fence + * component. Checked AFTER config_serve_fenced deliberately: byte + * delivery is the earlier step (the bytes must exist locally before + * this member's own checkpoint can even attempt to materialize + * against them), so checking byte-fence first surfaces the more + * fundamental blocker first in log/error ordering — but either fence + * alone is sufficient to refuse a state-changing op, so the final + * admit/refuse outcome does not depend on this ordering. Same + * allowlist as the byte-fence: replication + read-only/status ops + * stay admitted (they let materialization proceed and re-verify); + * everything else is refused with a loud non-serving error while the + * member STAYS ALIVE and keeps retrying (controller-never-self- + * terminate). */ + if (upgrade_materialization_fenced(ha->raft_c)) { + switch (opcode) { + /* Replication ops — let commit/apply advance + re-verify */ + case OPCode_heartbeat: + case OPCode_replConfig: + case OPCode_replConfigPush: + case OPCode_upgradeConfigAck: + case OPCode_hello: + case OPCode_walAck: + case OPCode_replEntry: + case OPCode_replAck: + case OPCode_replCatchUpDone: + case OPCode_walCatchupEntry: + case OPCode_snapshotTransfer: + /* Read-only queries / status — answerable while fenced */ + case OPCode_get: + case OPCode_probeConfigTag: + case OPCode_ctrlstatus: + break; /* fall through to the quorum check below */ + default: + /* State-changing op while this member's own upgrade-snapshot + * materialization is incomplete/unverified: refuse. */ + return -XCE_ERR_NOT_READY; + } + } /* State-changing operations require majority so committed entries * are durable across failover. Read-only queries and replication * ops are always allowed. */ @@ -4204,6 +4962,38 @@ int ha_raft_on_repl_ack(cluster_t *c, int abs_peer_idx, uint64_t acked_lsn, return 0; } +int ha_raft_on_repl_nack(cluster_t *c, int abs_peer_idx, uint64_t reply_term, + uint64_t *corrected_lsn_out) +{ + if (!c) + return -EINVAL; + + /* Same defense-in-depth bounds/self check as ha_raft_on_repl_ack. */ + int self_idx = c->ha.my_priority; + int n_peers = c->ha.raft.n_peers; + if (abs_peer_idx < 0 || abs_peer_idx >= n_peers || abs_peer_idx == self_idx) { + ERROR("ha_raft_on_repl_nack: rejecting out-of-range peer index %d " + "(n_peers=%d self_idx=%d) — skipping library NACK accounting", + abs_peer_idx, n_peers, self_idx); + return -EINVAL; + } + + /* A rejected AppendEntries reports a log conflict at the sent + * prevLogIndex/prevLogTerm. match_index is unused on the failure branch + * (raft.c: "failure: next_index[peer] = Max(next_index[peer]-1, 1). Does + * NOT advance commit.") -- pass 0. The library applies the backoff only + * when reply_term == s->term (stale-term drop), same as the ack path. */ + (void)raft_on_append_entries_reply(&c->ha.raft, abs_peer_idx, /*success*/0, + /*match_index unused*/0, reply_term); + + if (corrected_lsn_out) { + uint64_t next = c->ha.raft.next_index[abs_peer_idx]; + *corrected_lsn_out = (next > 0) ? next - 1 : 0; + } + + return 0; +} + /* * ha_arm_own_term_gate: append the own-term WAL_NOOP and arm the commit * engine's writable_lsn gate (ha-single-leader-role task 2.2, Req 1.4/2.1/2.2). @@ -5172,15 +5962,32 @@ apply_role: /* First boot: call cluster_init_phase2 to load config+data (Req 9.2) */ if (is_first_boot) { + int p2rc = 0; #ifdef XCE_TESTING /* In test mode, use hook if set; skip real phase2 (cluster.c not linked) */ if (ha_phase2_hook != NULL) - ha_phase2_hook(c); + p2rc = ha_phase2_hook(c); #else if (c != NULL) - cluster_init_phase2(c); + p2rc = cluster_init_phase2(c); #endif - ha->phase2_done = 1; + if (p2rc == 0) { + ha->phase2_done = 1; + } else { + /* bug-1477: do NOT latch phase2_done on failure. Unlike + * raft_cb_become_leader, this legacy evaluation path has + * ALREADY signaled the caller's ctx->done semaphore with + * result=1 above (before "apply_role:") — refusing + * promotion here would leave that signal inconsistent + * with never becoming CTRL_PRIMARY. Proceed to + * CTRL_PRIMARY as before; ha_schedule_phase2_retry wires + * the commit engine shortly after instead of never. */ + WARN("HA FSM: cluster_init_phase2 failed on promotion " + "(rc=%d) — proceeding to CTRL_PRIMARY, retrying " + "phase2 (bug-1477)", p2rc); + if (c != NULL) + ha_schedule_phase2_retry(c); + } } /* ha-single-leader-role task 3.1 (Req 1.1, 1.5): enter CTRL_PRIMARY @@ -5253,15 +6060,27 @@ apply_role: /* First boot: call cluster_init_phase2 so structures are ready; * config arrives via primary's replication push (Req 9.2, 7.3) */ if (is_first_boot) { + int p2rc = 0; #ifdef XCE_TESTING /* In test mode, use hook if set; skip real phase2 (cluster.c not linked) */ if (ha_phase2_hook != NULL) - ha_phase2_hook(c); + p2rc = ha_phase2_hook(c); #else if (c != NULL) - cluster_init_phase2(c); + p2rc = cluster_init_phase2(c); #endif - ha->phase2_done = 1; + if (p2rc == 0) { + ha->phase2_done = 1; + } else { + /* bug-1477: do NOT latch phase2_done on failure — a + * standby can safely stay passive while + * ha_schedule_phase2_retry retries. */ + WARN("HA FSM: cluster_init_phase2 failed on " + "become-standby (rc=%d) — member stays alive, will " + "retry (bug-1477)", p2rc); + if (c != NULL) + ha_schedule_phase2_retry(c); + } } atomic_store_explicit(&ha->role, (int32_t)CTRL_STANDBY, @@ -5930,12 +6749,14 @@ static int repl_ack_decode_and_dispatch(endpoint_t *ep, vote_ep_ctx_t *vctx, oldest_wal_lsn = ha_compute_oldest_wal_lsn(c->persist.wal_path); } #endif - /* Replication target: use max(committed_lsn, last_written) so - * standbys can catch up even when committed_lsn is stuck at 0 - * (no replicator-registered standbys to advance it). */ - uint64_t target_lsn = committed_lsn; - if (last_written > target_lsn) - target_lsn = last_written; + /* Replication target (bug-1478): committed_lsn, with the + * last_written bootstrap fallback ONLY when committed_lsn is + * genuinely stuck at 0 — see ha_compute_repl_target_lsn's own + * doc comment for why an unconditional max() permanently wedges + * catch-up once a local-only checkpoint trails a real, + * already-advancing committed_lsn. */ + uint64_t target_lsn = + ha_compute_repl_target_lsn(committed_lsn, last_written); ha_dispatch_repl_action_for_standby(ha, c, ep, peer_idx, committed_tag, target_lsn, @@ -5991,8 +6812,36 @@ static int repl_ack_decode_and_dispatch(endpoint_t *ep, vote_ep_ctx_t *vctx, pthread_mutex_lock(&ha->raft_lock); (void)raft_on_higher_term_observed(&ha->raft, reply_term); pthread_mutex_unlock(&ha->raft_lock); + + /* bug-1479: a same-or-lower-term NACK means an ordinary Raft + * log conflict (ae_reject_logmismatch), NOT a stale-term + * primary — the case above doesn't cover it. Before this fix + * the reject was silently dropped: the library's own, + * already-correct nextIndex backoff (raft_on_append_entries_ + * reply) was never invoked, so the primary kept re- + * broadcasting NEW entries assuming agreement at an index + * the standby had already rejected, forever — the standby + * would eventually get silently evicted via + * MAX_PENDING_ACKS, but nothing would ever stream it back + * into sync (repl_start_catchup's own driver, the ACK-driven + * continuation, needs a real ACK to fire, and a log- + * conflicted standby can never send one while stuck). + * Immediately (not after 16 silent failures) back off via + * the library and mark catch-up at the corrected position — + * ha_dispatch_repl_action_for_standby's heartbeat-driven + * decision (below) is what actually streams to it. */ + if (c) { + int ack_abs_idx = ha_repl_ack_abs_peer_idx( + &c->ha, /*ep_is_vote*/ vctx->ctx != NULL, vctx->peer_idx); + uint64_t corrected_lsn = 0; + if (ha_raft_on_repl_nack(c, ack_abs_idx, reply_term, + &corrected_lsn) == 0) { + repl_start_catchup(&c->persist.repl, ep, corrected_lsn); + } + } WARN("repl_ack_decode_and_dispatch: WAL NACK from standby" - " lsn=%lu success=0 — ignoring", (unsigned long)acked_lsn); + " lsn=%lu success=0 — marking catch-up", + (unsigned long)acked_lsn); } } else if (rep_s.data_which == RequestReply_data_replconfigpushreplymsg) { /* Config-push ACK from standby (ha-commit-barrier-rollout task @@ -6766,11 +7615,54 @@ void raft_cb_become_leader_with_cluster_for_test(cluster_t *c, uint64_t term) } #endif /* XCE_TESTING */ -/* ── Task 2.4: vote_ep_err_handler ───────────────────────────────────────── +/* ── Task 2.4 / raft-adapter-conformance task 3.1: vote endpoint err handlers ── * - * Called by iomgr when the outgoing vote endpoint encounters an error - * (connect failure, SSL error, remote close before reply). - * Counts the peer as denied: grant=0, tag=0, lsn=0. + * vote_ep_handle_promoted_disconnect: shared CTRL_PRIMARY-role cleanup for a + * dropped promoted connection (standby-endpoint deregistration, WAL + * replicator deregistration, quorum-transition logging). Extracted + * byte-for-byte from the formerly-single vote_ep_err_handler so both the + * real-vote and PreVote on_err handlers apply the identical cleanup — this + * branch's behavior is unchanged by the split. + */ +static void vote_ep_handle_promoted_disconnect(ha_state_t *ha, endpoint_t *ep, + vote_ep_ctx_t *vctx) +{ + /* Promoted connection dropped — remove from standby_endpoints */ + if (ha->standby_endpoints) { + pthread_mutex_lock(&ha->lock); + for (int i = 0; i < ha->standby_endpoints->count; i++) { + if (zarray_get(ha->standby_endpoints, i) == ep) { + zarray_del(ha->standby_endpoints, i); + break; + } + } + pthread_mutex_unlock(&ha->lock); + } + /* Task 2.2: deregister from WAL replicator. + * Req 1.2: when a standby disconnects, the HA layer shall deregister + * the endpoint from the replicator via repl_remove_standby. + * vctx->c may be NULL in test mode — guard accordingly. */ + if (vctx->c) + repl_remove_standby(&vctx->c->persist.repl, ep); + + /* Quorum-transition observability (Req 8.1): a standby just dropped — the + * write-quorum count changed. Record the loss edge once (silent if + * quorum is still held after the removal). */ + ha_log_quorum_transition(ha); +} + +/* + * vote_ep_err_handler: on_err callback for outgoing REAL-VOTE endpoints + * (registered in raft_cb_send_vote_request). Called by iomgr when the + * endpoint encounters an error (connect failure, SSL error, remote close + * before reply). + * + * Election-phase branch counts a post-connect failure through + * vote_reply_dispatch — the SAME production tally path a connect-time + * failure (raft_cb_send_vote_request's own rc<0 branches, bug-1423) or a + * delivered denial (vote_reply_msg_handler) already uses — instead of the + * legacy handle_request_vote_reply, which bypasses raft_on_vote_reply + * (raft-adapter-conformance Requirement 4.2). */ static int vote_ep_err_handler(void *ep_raw) { @@ -6783,34 +7675,13 @@ static int vote_ep_err_handler(void *ep_raw) memory_order_acquire); if (role == CTRL_PRIMARY) { - /* Promoted connection dropped — remove from standby_endpoints */ - if (ha->standby_endpoints) { - pthread_mutex_lock(&ha->lock); - for (int i = 0; i < ha->standby_endpoints->count; i++) { - if (zarray_get(ha->standby_endpoints, i) == ep) { - zarray_del(ha->standby_endpoints, i); - break; - } - } - pthread_mutex_unlock(&ha->lock); - } - /* Task 2.2: deregister from WAL replicator. - * Req 1.2: when a standby disconnects, the HA layer shall deregister - * the endpoint from the replicator via repl_remove_standby. - * vctx->c may be NULL in test mode — guard accordingly. */ - if (vctx->c) - repl_remove_standby(&vctx->c->persist.repl, ep); - - /* Quorum-transition observability (Req 8.1): a standby just dropped — the - * write-quorum count changed. Record the loss edge once (silent if - * quorum is still held after the removal). */ - ha_log_quorum_transition(ha); + vote_ep_handle_promoted_disconnect(ha, ep, vctx); } else { - /* Election phase: count as denied vote */ - handle_request_vote_reply(ha, vctx->ctx, vctx->peer_idx, - vctx->my_term, - 0, /* vote_granted = false */ - 0, 0); + /* Election phase: count as a denied vote through the production + * tally, same path a connect-time failure or a delivered denial + * uses (raft-adapter-conformance Requirement 4.2). */ + vote_reply_dispatch(ha, vctx->ctx, vctx->peer_idx, vctx->my_term, + /*vote_granted=*/0, 0, 0); } /* Do NOT free vctx here — peer_ctrl_msg_handler may still reference ep->data. @@ -6818,6 +7689,56 @@ static int vote_ep_err_handler(void *ep_raw) return 0; } +/* + * pre_vote_ep_err_handler: on_err callback for outgoing PREVOTE endpoints + * (registered in raft_cb_send_pre_vote_request). Mirrors vote_ep_err_handler + * above for the PreVote endpoint kind — the two kinds share vote_ep_ctx_t but + * are already registered at distinct call sites, so the split (rather than a + * new discriminant field on vote_ep_ctx_t) mirrors an existing seam. + * + * Election-phase branch counts a post-connect failure through + * pre_vote_reply_dispatch — the SAME production tally path a connect-time + * failure (raft_cb_send_pre_vote_request's own rc<0 branches, bug-1423 PreVote + * twin) already uses — instead of the legacy handle_request_vote_reply + * (raft-adapter-conformance Requirement 4.3). + */ +static int pre_vote_ep_err_handler(void *ep_raw) +{ + endpoint_t *ep = (endpoint_t *)ep_raw; + vote_ep_ctx_t *vctx = (vote_ep_ctx_t *)ep->data; + if (!vctx) return 0; + + ha_state_t *ha = vctx->ha; + ctrl_role_t role = (ctrl_role_t)atomic_load_explicit(&ha->role, + memory_order_acquire); + + if (role == CTRL_PRIMARY) { + vote_ep_handle_promoted_disconnect(ha, ep, vctx); + } else { + /* Election phase: count as a not-granted PreVote reply through the + * production tally, same path a connect-time failure uses + * (raft-adapter-conformance Requirement 4.3). */ + pre_vote_reply_dispatch(ha, vctx->c, vctx->peer_idx, /*granted=*/0); + } + + /* Do NOT free vctx here — peer_ctrl_msg_handler may still reference ep->data. + * vctx is freed in ha_election_cleanup() when all per-peer contexts release. */ + return 0; +} + +#ifdef XCE_TESTING +/* + * pre_vote_ep_err_handler_for_test: call the static pre_vote_ep_err_handler on + * ep. Allows tests to invoke the PreVote err_handler without going through + * iomgr/endpoint machinery — the PreVote twin of vote_ep_err_handler_for_test + * (raft-adapter-conformance task 3.2). + */ +int pre_vote_ep_err_handler_for_test(endpoint_t *ep) +{ + return pre_vote_ep_err_handler((void *)ep); +} +#endif /* XCE_TESTING */ + /* ── ha_init_raft: one-time raft state machine initialization ──────────────── * * Called once at startup after ha_restore_term() to wire the raft state diff --git a/src/controller/ha.h b/src/controller/ha.h index c6dc080..c26b5c7 100644 --- a/src/controller/ha.h +++ b/src/controller/ha.h @@ -320,6 +320,44 @@ typedef struct { * cleared and the config is activated. * NEVER self-terminates (loud non-serving * fence only). 0 at init (ha_init memset). */ + /* ── New field added by config-upgrade-snapshot spec (Task 6.1) ────── */ + _Atomic int upgrade_materialization_fence; /* Upgrade-snapshot + * materialization-and-hash-verify + * fence (Req 1.8, 3.2, 3.4) — a NEW, + * INDEPENDENT fence, deliberately NOT + * merged into config_serve_fence + * above: that fence tracks whether the + * out-of-band config-PUSH bytes match + * the committed marker; THIS fence + * tracks whether THIS MEMBER'S OWN + * upgrade-snapshot materialization + * (the marker-triggered checkpoint, + * config-upgrade-snapshot task 5) has + * actually completed for the CURRENT + * committed marker, with the live + * on-disk config bytes still + * hash-verifying against it right + * now. These are logically distinct + * and can disagree in either + * direction (e.g. bytes can already + * hash-match — config_serve_fence + * clear — while this member's own + * checkpoint for that exact marker + * has not run yet, immediately after + * a marker commits but before its + * forced checkpoint fires). Set by + * upgrade_materialization_verify() + * on materialization-incomplete or a + * hash mismatch against a FRESH + * re-read of the live config bytes + * (never a cached/embedded copy); + * cleared on success. While set, the + * member MUST NOT serve under the new + * configuration or become primary; it + * STAYS ALIVE and keeps retrying. + * NEVER self-terminates (loud + * non-serving fence only). 0 at init + * (ha_init memset). */ /* ── New field added by raft-drive-async spec (Task 2.1) ──────── */ _Atomic int reconnect_inflight[MAX_HA_CANDIDATES]; /* Per-peer * single-flight guard for the offloaded @@ -558,6 +596,32 @@ int ha_primary_log_append(cluster_t *c, uint32_t type, int ha_raft_on_repl_ack(cluster_t *c, int abs_peer_idx, uint64_t acked_lsn, uint64_t reply_term); +/* + * ha_raft_on_repl_nack (bug-1479): drive the library on a REJECTED + * AppendEntries (WalAckReply.success == 0, i.e. the standby's log conflicts + * at the sent prevLogIndex/prevLogTerm). Routes the rejection through + * raft_on_append_entries_reply(success=0), which backs off + * next_index[abs_peer_idx] by one (raft.tla's AppendEntries failure branch, + * floored at 1) -- mirrors ha_raft_on_repl_ack's bounds-checked peer-index + * resolution exactly, but does NOT call raft_advance_commit (a rejection + * can never advance commit). + * + * Before this fix, a NACK was only ever used for stale-term discovery + * (raft_on_higher_term_observed) and otherwise silently dropped -- the + * library's own, already-correct nextIndex backoff mechanism was never + * invoked, so a standby stuck in a genuine log conflict (an ordinary + * post-election occurrence) never had its resend position corrected: the + * primary kept broadcasting new entries assuming agreement at an index the + * standby had already rejected, forever. + * + * Returns the corrected resume LSN (next_index[abs_peer_idx] - 1, i.e. the + * position the standby is now believed caught up through) via + * *corrected_lsn_out on success; returns -EINVAL (leaving *corrected_lsn_out + * untouched) on a no-cluster context or a rejected peer index, matching + * ha_raft_on_repl_ack's defense-in-depth bounds check. */ +int ha_raft_on_repl_nack(cluster_t *c, int abs_peer_idx, uint64_t reply_term, + uint64_t *corrected_lsn_out); + /* * ha_repl_ack_abs_peer_idx (ha-term-safety task 3.3 remediation): resolve the * ABSOLUTE library peer index from an ACK endpoint's stored peer_idx, branching @@ -755,6 +819,122 @@ int ha_dispatch_gate(ha_state_t *ha, int opcode); */ int ha_config_promotion_fenced(const ha_state_t *ha); +/* + * upgrade_materialization_verify (config-upgrade-snapshot task 6.1, Req 1.8, + * 3.2, 3.4): the Activation Fence's own verify function. Mirrors + * config_activate_committed's exact shape (config_repl.c:304-377) for a + * DIFFERENT, independently-tracked condition — see ha_state_t's + * upgrade_materialization_fence field doc comment above for the full + * rationale on why this must be a separate fence from config_serve_fence. + * + * On every call: reads the current committed WAL_CONFIG_MARKER (the + * authority for the target upgrade), checks whether THIS MEMBER'S OWN + * checkpoint machinery has already captured a materialization reference for + * that EXACT marker (c->persist.cfgref_present/cfgref_tag/cfgref_sha, + * stamped by every checkpoint via persist.c's scan_latest_committed_config_ + * ref), and separately re-reads the LIVE, currently-active config bytes off + * disk FRESH (never a cached/embedded copy) to hash-verify them against the + * marker too. Both must hold for the fence to clear. + * + * Returns 0 (fence cleared or absent-marker benign case) on success; + * -EAGAIN when materialization is incomplete or the hash mismatches (fence + * SET, logged loud only on the 0->1 transition); -EINVAL/-EIO on a genuine + * error reading the committed marker. NEVER exits/aborts on this condition + * (controller/CLAUDE.md never-self-terminate invariant) — always fail loud + + * fence + stay alive + retriable. + */ +int upgrade_materialization_verify(cluster_t *c); + +/* + * upgrade_materialization_fenced: 1 when this member's own upgrade-snapshot + * materialization for the current committed config marker is incomplete or + * hash-mismatched (upgrade_materialization_fence set); 0 otherwise. Trivial + * atomic-read accessor — mirrors config_serve_fenced (config_repl.c:262-268) + * exactly, for the new independent fence. Pure atomic read (no I/O). + */ +int upgrade_materialization_fenced(const cluster_t *c); + +/* + * upgrade_materialization_retry_fn (config-upgrade-snapshot task 6.2, Req + * 3.4, 5.5): re-runs upgrade_materialization_verify so a member whose + * materialization was incomplete or hash-mismatched re-checks and clears the + * fence once conditions allow. Does the actual blocking disk I/O; production + * callers invoke it off the delaymgr thread via + * schedule_upgrade_materialization_retry's trampoline (below) — mirrors + * config_activate_retry_fn (config_repl.h). Public so tests can drive it + * directly without a vtask pool. `arg` is a `cluster_t *`. Returns 0 on + * success/already-unfenced, -EAGAIN while still fenced, negative errno on a + * genuine error. + */ +int upgrade_materialization_retry_fn(void *arg); + +/* + * schedule_upgrade_materialization_retry (config-upgrade-snapshot task 6.2, + * Req 3.4, 5.5): non-blocking, self-triggering retry for the Activation + * Fence — mirrors config_schedule_activate_retry's exact delaymgr- + * trampoline-then-vtask shape (config_repl.c:409-507): a one-shot delaymgr + * task (NON-BLOCKING — only enqueues) offloads the actual blocking re-verify + * work (upgrade_materialization_verify's disk reads) onto a VTASK_LIVE_BLOCK + * vtask so the delaymgr thread itself never blocks (ha-async-io.md + * thread-role contract). No-op when the member is NOT upgrade-materialization + * fenced (steady state schedules nothing — no busy-spin) or when the + * delaymgr is not running (unit-test fixture path; caller drives the retry + * directly instead). Falls back to running the verify inline (stay alive, + * never silently drop a scheduled retry) if the vtask pool is unavailable. + * Returns 0 on enqueue/no-op, negative on enqueue failure. + */ +int schedule_upgrade_materialization_retry(cluster_t *c); + +/* + * ha_phase2_retry_fn (bug-1477): re-attempts cluster_init_phase2 for a node + * whose earlier attempt(s) failed and never set ha->phase2_done. Idempotent + * -- a no-op once phase2_done is already set by ANY call site (the shared + * once-per-process contract every cluster_init_phase2 caller relies on). + * Does the actual blocking work (cluster_init_phase2 runs persist_recover, + * wires the commit engine, etc.); production callers invoke it off the + * delaymgr thread via ha_schedule_phase2_retry's trampoline (below) -- + * mirrors upgrade_materialization_retry_fn/config_activate_retry_fn exactly. + * Public so tests can drive it directly without a vtask pool. `arg` is a + * `cluster_t *`. Returns 0 on success/already-done, the underlying negative + * errno on a genuine cluster_init_phase2 failure (and self-reschedules + * before returning, so the caller need not). + * + * Root cause this closes: a node that takes myapp_run's skip_election + * passive path (bug-849) -- because a leader was already known after the + * startup stagger -- makes exactly ONE cluster_init_phase2 attempt. If that + * attempt races config availability and fails, NOTHING else ever retries + * it: raft_cb_become_follower / raft_cb_become_leader / + * ha_elect_evaluate_and_signal (the other three call sites) only fire via + * THIS node's own raft-library state transitions, which never happen for a + * node that stays passively CTRL_STANDBY while its primary keeps + * heartbeating normally. The node is then permanently stuck without a + * wired commit engine -- silently unable to apply ANY committed entry for + * the rest of its process lifetime (never self-terminates, per + * controller/CLAUDE.md's Process Lifecycle invariant, but never recovers + * either without this retry). + */ +int ha_phase2_retry_fn(void *arg); + +/* + * ha_schedule_phase2_retry (bug-1477): non-blocking, self-rescheduling retry + * for a node whose cluster_init_phase2 has not yet completed -- mirrors + * config_schedule_activate_retry / schedule_upgrade_materialization_retry's + * delaymgr-trampoline-then-vtask shape, except it re-arms ITSELF on failure + * (via ha_phase2_retry_fn) since -- unlike those two, which are re-triggered + * externally by every commit-advance/config-push event -- there is no + * other recurring event that would naturally re-trigger this for a node + * stuck on the passive skip_election path. Retries at ha->config. + * heartbeat_interval_ms cadence (the natural rhythm config/connectivity + * changes arrive on), indefinitely (never gives up -- never-self-terminate + * invariant). No-op when phase2_done is already set (steady state + * schedules nothing -- no busy-spin) or when the delaymgr is not running + * (unit-test fixture path; caller drives the retry directly instead). + * Falls back to running the retry inline (stay alive, never silently drop + * a scheduled retry) if the vtask pool is unavailable. Returns 0 on + * enqueue/no-op, negative on enqueue failure. + */ +int ha_schedule_phase2_retry(cluster_t *c); + /* * ha_apply_wal_catchup_entry: apply a single WAL catch-up entry to local * persistent storage and advance ha->applied_lsn on success. @@ -763,15 +943,36 @@ int ha_config_promotion_fenced(const ha_state_t *ha); * On success (rc == 0): applied_lsn advances to entry->lsn+1 and a * WalAckReply {term, lsn, success=1} is sent back to the primary via * xce_reply(ep, c->myhost, &reply) (Task 3.1, Req 3.1). - * On error (rc < 0): logs ERROR, returns error; no ACK sent (Task 3.2). + * On a genuine apply/persist ERROR (rc < 0): logs ERROR, returns error; no ACK + * sent at all (Task 3.2) -- there is nothing coherent to report back yet. + * On a term-carrying entry's AppendEntries REJECT (logOk fails -- forward gap + * or a genuine (term,lsn) conflict; rc == 0, entry not accepted): bug-1479 -- + * a WalAckReply {term, lsn, success=0} (a NACK) IS now sent, so the primary's + * ha_raft_on_repl_nack can back off nextIndex and immediately mark this + * standby for catch-up. Before this fix the reject was dropped with no reply + * at all, so the primary's NACK-handling could never engage no matter how + * correct it was -- the standby would loop rejecting the identical + * re-broadcast entry forever. * applied_lsn is in-memory only — not persisted to disk. - * ep and c may be NULL in unit-test builds (XCE_TESTING); ACK is skipped. + * ep and c may be NULL in unit-test builds (XCE_TESTING); ACK/NACK is skipped + * (or captured via ha_wal_ack_send_hook when set). * Requirements: 3.1, 3.2, 3.3, 3.4, 3.5 */ int ha_apply_wal_catchup_entry(ha_state_t *ha, persist_t *p, wal_catchup_entry_t *entry, struct endpoint_t *ep, cluster_t *c); +#ifdef XCE_TESTING +/* + * ha_wal_ack_send_hook: test-only seam for the outbound WalAckReply built by + * ha_send_wal_ack_reply_ex (bug-1479). When non-NULL, called with + * (term, lsn, success) INSTEAD OF building/sending the real reply over ep -- + * lets a unit test assert that an AppendEntries reject now sends a NACK + * (success=0), without needing a live endpoint. NULL in production. + */ +extern void (*ha_wal_ack_send_hook)(uint64_t term, uint64_t lsn, int success); +#endif + /* ha_nop_reply_state_report — populate a heartbeat reply with stateReport. * Fills *sr from ha->applied_lsn (atomic read) and myconf->config_version_tag, * then sets reply_out->data_which = stateReportMsg and @@ -1023,6 +1224,54 @@ void ha_process_standby_state(ha_state_t *ha, int peer_idx, uint64_t reported_tag, uint64_t reported_lsn, uint64_t committed_tag, uint64_t committed_lsn); +/* + * ha_compute_repl_target_lsn: the replication/convergence target used by + * ha_dispatch_repl_action_for_standby's heartbeat-driven decision — normally + * committed_lsn itself, falling back to last_written (the raw locally- + * appended WAL tip) ONLY when committed_lsn is genuinely stuck at 0 + * (cluster bootstrap, before any standby has ever acked anything). + * + * bug-1478: the fallback must NOT apply once committed_lsn is already > 0 — + * see ha.c's doc comment on this function for the full mechanism (a + * local-only WAL_CHECKPOINT trailing an already-advancing committed_lsn + * otherwise leaks an unstreamable/unreachable target into every subsequent + * heartbeat decision, permanently wedging catch-up). + * + * Pure, side-effect-free. + */ +uint64_t ha_compute_repl_target_lsn(uint64_t committed_lsn, + uint64_t last_written); + +/* + * ha_compute_repl_stream_ceiling_lsn (bug-1479, gap 3): the upper bound of + * what a leader may actually STREAM to a standby via ha_stream_wal_to_standby + * — distinct from ha_compute_repl_target_lsn's CONVERGENCE target above. + * + * Bounding the stream range at committed_lsn is a permanent deadlock whenever + * the very standby being streamed to must ACK before committed_lsn can + * advance at all (e.g. a 3-node cluster with one member down and this + * standby log-conflicted after a chaotic election): it can never receive the + * entries it needs to ack to unblock the majority. raft.tla's real + * AppendEntries replicates the leader's FULL log — leaderCommit is advisory + * to the follower, never a cap on what gets sent. Streaming past commit is + * always safe: a later leadership change's own (term,lsn) conflict-truncate + * (ha_consume_append_entries) correctly unwinds anything that turns out not + * to have been committed. + * + * bug-1478 guard: never widen the ceiling to exactly the trailing local-only + * checkpoint's own consumed LSN slot — no standby's applied_lsn can ever + * legitimately reach that value (WAL_CHECKPOINT is never streamed or applied + * by any standby, by design), so doing so would reintroduce bug-1478's + * permanent-non-convergence trap. Falling back to committed_lsn for just + * that transient instant is safe — the very next real entry appended after + * the checkpoint widens the ceiling normally again. + * + * Pure, side-effect-free — safe to unit test directly. + */ +uint64_t ha_compute_repl_stream_ceiling_lsn(uint64_t committed_lsn, + uint64_t last_written, + uint64_t checkpoint_lsn); + /* ── Task 3.5c: Standby snapshot receive handler ──────────────────────────── */ /* @@ -1173,6 +1422,22 @@ void ha_cb_commit_advanced_for_test(ha_state_t *ha, uint64_t commit_index); * term via the library. TEST-ONLY. */ void ha_arm_own_term_gate_for_test(cluster_t *c); + +/* + * ha_send_append_entries_stub_call_count (raft-adapter-conformance task 4.1, + * Requirement 3.3): test-only seam counting invocations of + * ha_cb_send_append_entries_stub, the on_send_append_entries callback. That + * callback is reachable only via the raft library's raft_send_append_entries + * (zero production callers) or ha_cb_send_append_entries_for_test above — + * see the DORMANT IN PRODUCTION comment on ha_cb_send_append_entries_stub in + * ha.c for the full finding. A test that drives only the production + * replication path (repl_broadcast / ha_stream_wal_to_standby) must observe + * this counter stay at 0; a future change that accidentally gives + * raft_send_append_entries a production caller moves it off zero. NULL in + * production (the whole symbol does not exist outside XCE_TESTING). + * TEST-ONLY. + */ +extern uint64_t ha_send_append_entries_stub_call_count; #endif /* @@ -1692,8 +1957,15 @@ uint32_t ha_jittered_election_delay(ha_state_t *ha, uint32_t base); * - HA_REPL_PUSH_CONFIG: In production builds, calls push_config_to_standbys(c, …). * In XCE_TESTING builds, calls ha_repl_push_config_for_standby_hook(c, peer_idx). * - HA_REPL_STREAM_WAL: calls ha_stream_wal_to_standby(ep, wal_path, standby_lsn, - * committed_lsn) to batch-stream WAL entries via xce_request() (non-blocking). - * In XCE_TESTING builds, calls ha_repl_stream_wal_hook if non-NULL. + * stream_ceiling_lsn) to batch-stream WAL entries via xce_request() + * (non-blocking). stream_ceiling_lsn (bug-1479 gap 3) is + * ha_compute_repl_stream_ceiling_lsn(committed_lsn, last_written, + * checkpoint_lsn) when c is non-NULL — the leader's own log tail, NOT + * just committed_lsn, so a standby whose own ack is required to advance + * committed_lsn can still receive the entries it needs to ack. Falls + * back to committed_lsn when c is NULL (test fixtures with no real + * persist_t). In XCE_TESTING builds, calls ha_repl_stream_wal_hook if + * non-NULL. * - HA_REPL_SEND_SNAPSHOT: calls ha_send_snapshot_to_standby(ep, snap_path, lsn). * In XCE_TESTING builds, calls ha_repl_send_snapshot_hook(peer_idx) if non-NULL. * - HA_REPL_CONVERGED: no-op. diff --git a/src/controller/include/worker.h b/src/controller/include/worker.h index 1efcbc5..3627ec8 100644 --- a/src/controller/include/worker.h +++ b/src/controller/include/worker.h @@ -13,5 +13,6 @@ extern int init_worker(cluster_t*, endpoint_t*, const char*, extern int rejoin_worker(cluster_t*, worker_t*, endpoint_t*, hostattrs_t*, xce_hostconfig_t*); extern int restore_worker(void*, xce_worker_t); +extern int restore_host_state(cluster_t*, const char*, uint32_t); extern int worker_from_capnp(cluster_t*, const void*, size_t); #endif diff --git a/src/controller/main.c b/src/controller/main.c index a369257..bd891e3 100644 --- a/src/controller/main.c +++ b/src/controller/main.c @@ -400,6 +400,14 @@ int main(int argc, char* argv[]) myconf.xstrings_delta = arguments.xstrings_delta; memset(&myconf.peers_cfg, 0, sizeof(myconf.peers_cfg)); + /* bug-1476: myconf.lock serializes load_primary_config() against + * concurrent invocations for this myconf_t — must be initialized before + * cluster_run/myapp_run can ever call it. */ + if (mylock_init(&myconf.lock) != 0) { + ERROR("Failed to initialize myconf lock"); + return -1; + } + if (arguments.peers_str) { if (xce_parse_peers(arguments.peers_str, &myconf.peers_cfg) != 0) { fprintf(stderr, diff --git a/src/controller/meson.build b/src/controller/meson.build index 5fcd31f..6e00c6c 100644 --- a/src/controller/meson.build +++ b/src/controller/meson.build @@ -54,11 +54,14 @@ controller = executable('xce_controller', link_args: wrap_link_args, install: true) -xce_test_src = [ 'testsuite/test.c', 'testsuite/waldump.c', 'testsuite/walcompare.c', 'testsuite/snapverify.c', 'testsuite/snapdiff.c'] +xce_test_src = [ 'testsuite/test.c', 'testsuite/waldump.c', 'testsuite/walcompare.c', 'testsuite/snapverify.c', 'testsuite/snapdiff.c', 'testsuite/configcompare.c'] readline_dep = dependency('readline') ncurses_dep = dependency('ncurses') history_dep = dependency('history') +ssl_dep = dependency('openssl') # also needed by configcompare.c (SHA256()); + # controller_unit_test_deps below re-assigns + # the same dependency() result, harmless xce_test_deps = [ libxce_dep, @@ -70,6 +73,7 @@ xce_test_deps = [ tinylog_dep, zlib_dep, # waldump: crc32 WAL validation c_capnproto_dep, # waldump: decode JOB_SUBMIT jobid + ssl_dep, # configcompare: SHA256() active-config hashing ] xce_test = executable('xce_test', xce_test_src, @@ -157,6 +161,8 @@ controller_unit_test_src = [ 'testsuite/snapverify.c', 'testsuite/test_snapdiff.c', 'testsuite/snapdiff.c', + 'testsuite/test_configcompare.c', + 'testsuite/configcompare.c', 'testsuite/test_persist_snapshot_entities.c', 'testsuite/test_apply_seam.c', 'testsuite/test_apply_committed_entry.c', @@ -168,6 +174,9 @@ controller_unit_test_src = [ 'testsuite/test_job_array_apply.c', 'testsuite/test_job_array_fence.c', 'testsuite/test_job_array_replay_fence.c', + 'testsuite/test_upgrade_snapshot_restore.c', + 'testsuite/test_upgrade_snapshot_apply.c', + 'testsuite/test_bug857_regression.c', 'ctrlstatus.c', 'commit.c', 'job.c', @@ -184,6 +193,7 @@ controller_unit_test_src = [ 'ctrl_metrics.c', 'config_repl.c', 'slowlane.c', + 'cluster.c', ] ssl_dep = dependency('openssl') diff --git a/src/controller/myapp.c b/src/controller/myapp.c index cf214ae..7066933 100644 --- a/src/controller/myapp.c +++ b/src/controller/myapp.c @@ -251,6 +251,39 @@ int myapp_run(myconf_t *myconf) } /* Ignore other errors — node may have no config yet (first boot/standby); * it fetches config via the primary's push post-election (Req 7.3). */ + + /* config-upgrade-snapshot task 6.2 (Req 5.2): resume Activation-Fence + * verification here too, unconditionally, so a crash/restart resumes + * materialization-verification before serving rather than implicitly + * treating a fresh process's zero-initialized (unfenced) fence as + * "already verified". Sequenced AFTER config_activate_committed + * deliberately: that call is what establishes/repairs which config + * BYTES are locally active for the committed marker; only once that + * has run does the separate, sequential question + * upgrade_materialization_verify asks -- has THIS MEMBER'S OWN + * checkpoint machinery actually materialized under that marker? -- + * become meaningful to (re-)evaluate. persist_recover() (step 6, + * above) has already restored c.persist.cfgref_* from the latest + * loaded checkpoint by this point, so the materialization signal + * this reads is accurate here, at boot, same as it would be after + * any later checkpoint. Same "ignore other errors, log loud only on + * the fenced case" treatment as config_activate_committed above -- + * ha_dispatch_gate and the promotion gate (ha.c) are what actually + * enforce the fence from here on; this call's only job is to seed + * the correct fence value at boot instead of leaving a freshly- + * started process at its unfenced zero-default regardless of + * whether materialization genuinely completed before the crash. */ + int mat_rc = upgrade_materialization_verify(&c); + if (mat_rc == -EAGAIN) { + ERROR("Pre-election upgrade materialization FENCED: this " + "member's own upgrade-snapshot materialization for the " + "committed config marker is incomplete or hash-mismatched " + "— member NON-SERVING and NON-PROMOTABLE, staying alive " + "and retrying (config-upgrade-snapshot R1.8/3.2/3.4/5.2)"); + } + /* Ignore other errors/success silently — mirrors the "ignore other + * errors" handling above; ha_dispatch_gate / the promotion gate + * enforce the fence going forward. */ } /* ── Step 8: ha_start_election_async ─────────────────────────────────── */ @@ -387,8 +420,11 @@ skip_election:; int prc = cluster_init_phase2(&c); if (prc != 0) { WARN("myapp_run: cluster_init_phase2 on standby rejoin " - "failed (rc=%d) — WAL not recovered; falling back to " - "election-path recovery", prc); + "failed (rc=%d) — WAL not recovered; member stays " + "alive and will retry (bug-1477: this passive " + "skip_election path never sees the election-result " + "callers that would otherwise retry it)", prc); + ha_schedule_phase2_retry(&c); } else { c.ha.phase2_done = 1; } diff --git a/src/controller/myconf.c b/src/controller/myconf.c index 19079f8..0771335 100644 --- a/src/controller/myconf.c +++ b/src/controller/myconf.c @@ -163,4 +163,5 @@ void myconf_fini(myconf_t *myconf) free(myconf->cluster_config); myconf->cluster_config = NULL; } + mylock_fini(&myconf->lock); /* bug-1476 */ } diff --git a/src/controller/persist.c b/src/controller/persist.c index 943dbfd..112e1fb 100644 --- a/src/controller/persist.c +++ b/src/controller/persist.c @@ -37,6 +37,38 @@ extern int worker_from_capnp(cluster_t* c, const void* capnp_payload, size_t len); extern int restore_queue_state(cluster_t* c, const char* name, uint32_t status); +/* restore_host_state defined in worker.c (config-upgrade-snapshot task 3, + * Req 1.10/1.11/5.8) -- create-if-missing host admin-state restore, called + * from load_snapshot_entities' host-frame loop below (task 4). */ +extern int restore_host_state(cluster_t* c, const char* name, + uint32_t admin_status); +/* upgrade_materialization_verify defined in ha.c (config-upgrade-snapshot + * task 6.1/6.2, Req 1.8/3.2/3.4/5.2/5.5) -- the Activation Fence's own + * verify function. Called unconditionally from apply_committed_entry's + * WAL_CONFIG_MARKER case below (task 6.2): checkpoint completion is the + * design-intended trigger that re-evaluates this fence (design.md's + * Activation Fence component, "naturally re-evaluates against the newer + * marker once that checkpoint's write_snapshot call runs"), since it is + * the ONLY event that can newly set OR clear it from a running process -- + * every other call path (upgrade_materialization_retry_fn and its + * callers) is itself gated on the fence already being set, so without + * this call site the fence could never transition from its zero- + * initialized default. */ +extern int upgrade_materialization_verify(cluster_t* c); + +/* config_activate_committed defined in config_repl.c (config-upgrade-snapshot + * task 5/6.2 remediation, bug-1469, Req 1.8/3.2/3.4) -- re-parses the + * locally-held config bytes referenced by the latest committed + * WAL_CONFIG_MARKER into c->myconf (load_primary_config), hash-verifying + * them first. Called unconditionally from apply_committed_entry's + * WAL_CONFIG_MARKER case below, BEFORE upgrade_materialization_verify: every + * member's own live apply of a marker it just committed must refresh its + * own c->myconf, not only members that separately receive an out-of-band + * handle_repl_config_push (see the call site's own doc comment for the full + * rationale). Declared here via extern, mirroring upgrade_materialization_ + * verify just above, rather than pulling in config_repl.h's full include + * surface for one symbol. */ +extern int config_activate_committed(cluster_t* c); /* raft-apply-decoupling task 3.2: pending command-apply hand-off list node * (producer side; the not-yet-built ordered apply pump, task 6.1/6.2, is @@ -101,6 +133,64 @@ static int capnp_encode_worker(const xce_worker_t* w, uint8_t** out, size_t* out return 0; } +/* Serialize a host admin-state frame (config-upgrade-snapshot task 2.1, Req + * 1.6/1.7/1.9) to a malloc'd Cap'n Proto buffer. Mirrors capnp_encode_job + * above exactly -- capnp_host_admin_state_t (typemap.h) is a frame-only + * (name, status) pair, never the full xce_worker_t (design.md Design + * Invariant 5). Caller must free(*out) on success. */ +static int capnp_encode_host_admin_state(const capnp_host_admin_state_t* h, + uint8_t** out, size_t* out_len) +{ + struct capn c; + struct capn_segment* cs; + struct HostAdminState ch; + HostAdminState_ptr hp; + + capn_init_malloc(&c); + cs = capn_root(&c).seg; + encode_HostAdminState(cs, &ch, (capnp_host_admin_state_t*)h); + hp = new_HostAdminState(cs); + write_HostAdminState(&ch, hp); + capn_setp(capn_root(&c), 0, hp.p); + + *out_len = capn_size(&c); + *out = malloc(*out_len); + if (!*out) { capn_free(&c); return -ENOMEM; } + capn_write_mem(&c, *out, *out_len, 0); + capn_free(&c); + return 0; +} + +/* Serialize a queue admin-state frame (config-upgrade-snapshot task 2.2, Req + * 1.9/5.7) to a malloc'd Cap'n Proto buffer. Mirrors + * capnp_encode_host_admin_state above exactly -- capnp_queue_admin_state_t + * (typemap.h) is a frame-only (name, status) pair, matching + * restore_queue_state's exact (name, status) contract (queue.c:208), same + * field content as the prior raw layout, only the wire encoding changes. + * Caller must free(*out) on success. */ +static int capnp_encode_queue_admin_state(const capnp_queue_admin_state_t* q, + uint8_t** out, size_t* out_len) +{ + struct capn c; + struct capn_segment* cs; + struct QueueAdminState cq; + QueueAdminState_ptr qp; + + capn_init_malloc(&c); + cs = capn_root(&c).seg; + encode_QueueAdminState(cs, &cq, (capnp_queue_admin_state_t*)q); + qp = new_QueueAdminState(cs); + write_QueueAdminState(&cq, qp); + capn_setp(capn_root(&c), 0, qp.p); + + *out_len = capn_size(&c); + *out = malloc(*out_len); + if (!*out) { capn_free(&c); return -ENOMEM; } + capn_write_mem(&c, *out, *out_len, 0); + capn_free(&c); + return 0; +} + /* WAL_WORKER_CTRL payload: [uint32_t detail][capnp bytes...] or [uint32_t detail][name\0] */ #define WORKER_WAL_HDR_SIZE sizeof(uint32_t) @@ -409,14 +499,37 @@ static void* fsync_worker(void* arg) * WAL term adapter (ha-term-safety task 1.3, R1.1/R1.5/R1.6/R1.7/R1.8) * * ------------------------------------------------------------------ */ +/* Sentinel stored in a term_index[] slot that has never been explicitly + * written by record_entry_term — distinct from a genuinely-recorded raw term + * of 0 (a legacy pre-term-safety entry, which maps to WAL_LEGACY_TERM at + * read-back). Reserved so growth (below) can leave a gap slot reading back as + * truly ABSENT forever, not just until the NEXT lsn happens to be recorded + * (bug-1475 follow-up: a WAL_CHECKPOINT slot is deliberately never recorded — + * see persist_write_checkpoint_marker's comment — but before this fix, the + * geometric-growth realloc for ANY later lsn zero-filled the checkpoint's own + * gap slot, and entry_term_locked's raw==0 rule then read that zero-fill back + * as WAL_LEGACY_TERM, not absent — silently and retroactively flipping a + * deliberately-unrecorded LSN's term the instant any later entry was + * appended. Confirmed via live instrumentation: persist_entry_term(checkpoint + * lsn) read back 0 (absent) immediately after the checkpoint, then 1 + * (WAL_LEGACY_TERM) once a later real entry was appended and grew the array + * past it — a time-of-check/time-of-use divergence between the sender (which + * scans/streams AFTER later entries exist) and a receiver that has not yet + * appended past the same checkpoint, causing logOk's prev_log_term equality + * check to spuriously mismatch (0 != 1) and permanently reject catch-up). */ +#define TERM_INDEX_UNSET UINT64_MAX + /* Record an entry's RAW hdr.term at its 1-based LSN in the in-memory per-LSN * term index (R1.5). Grows the index on demand; LSNs replay/append contiguously * so the array is dense (slot i == LSN i+1). Any gap left by a non-contiguous - * LSN (should not happen on the contiguous WAL) is zero-filled by realloc-then- - * memset, which read back as "absent" until/unless written. The raw term - * (including a legacy 0) is stored verbatim; the legacy-0 -> WAL_LEGACY_TERM - * mapping is applied only at READ-BACK (persist_entry_term), keeping "present - * legacy-0" distinguishable from "absent". + * LSN (e.g. a deliberately-skipped WAL_CHECKPOINT slot) is filled with the + * TERM_INDEX_UNSET sentinel by realloc-then-memset, which reads back as + * "absent" PERMANENTLY — regardless of whether a later LSN is subsequently + * recorded and grows term_index_count past it (bug-1475 follow-up; see + * TERM_INDEX_UNSET's comment). The raw term (including a legacy 0) is stored + * verbatim; the legacy-0 -> WAL_LEGACY_TERM mapping is applied only at + * READ-BACK (persist_entry_term), keeping "present legacy-0" distinguishable + * from "absent". * * Callers: the live append path (holds p->lock) and the single-threaded * recovery path (replay_wal — no other thread touches the index before the node @@ -441,8 +554,11 @@ static void record_entry_term(persist_t* p, uint64_t lsn, uint64_t term) "back as absent", lsn, p->term_index_cap, new_cap); return; } - /* Zero-fill the newly grown region so any unwritten slot reads absent. */ - memset(grown + p->term_index_cap, 0, + /* Fill the newly grown region with the UNSET sentinel (all-1s byte + * pattern, so memset can fill it directly) so any never-explicitly- + * written slot reads absent FOREVER, not just until term_index_count + * happens to grow past it (bug-1475 follow-up). */ + memset(grown + p->term_index_cap, 0xFF, (new_cap - p->term_index_cap) * sizeof(uint64_t)); p->term_index = grown; p->term_index_cap = new_cap; @@ -466,6 +582,11 @@ static uint64_t entry_term_locked(const persist_t* p, uint64_t lsn) return 0; if (lsn <= p->term_index_count && p->term_index != NULL) { uint64_t raw = p->term_index[lsn - 1]; + /* bug-1475 follow-up: a slot filled by growth but never explicitly + * recorded (e.g. a skipped WAL_CHECKPOINT lsn) stays absent forever — + * see TERM_INDEX_UNSET. */ + if (raw == TERM_INDEX_UNSET) + return 0; return (raw == 0) ? WAL_LEGACY_TERM : raw; } return 0; @@ -476,8 +597,11 @@ static uint64_t entry_term_locked(const persist_t* p, uint64_t lsn) * the on-disk entries above keep_lsn are removed, keeping the term index * consistent with the WAL: a later persist_entry_term on a truncated LSN must * return 0. The backing allocation is left as-is (only the live count moves); - * the zeroed-on-grow contract means a later re-append at those LSNs overwrites - * cleanly. Caller must hold p->lock. */ + * the TERM_INDEX_UNSET-sentinel-on-grow contract (bug-1475 follow-up — grown + * slots are filled with TERM_INDEX_UNSET, not zero, since this fix) means a + * later re-append at those LSNs still overwrites cleanly: record_entry_term + * always writes the slot explicitly, regardless of what fill value (zero or + * sentinel) it previously held. Caller must hold p->lock. */ static void truncate_term_index_locked(persist_t* p, uint64_t keep_lsn) { if (!p) @@ -534,15 +658,44 @@ uint64_t persist_entry_term_locked(const persist_t* p, uint64_t lsn) * check against this member ever references an LSN below the checkpoint * again (the checkpoint is the new log-start boundary), and the WAL bytes * below it were compacted away, so there is no data to reconstruct a full - * per-LSN history from even if it were needed. */ + * per-LSN history from even if it were needed. + * + * bug-1475 Finding 2 (coordinator review, 2026-07-27/28): checkpoint_term==0 + * on the wire is UNAMBIGUOUS today, not a legacy default to fall back to + * WAL_LEGACY_TERM. ha_snapshot_do_send (ha.c) — the only sender — computes + * this value via persist_entry_term(leader, checkpoint_lsn), whose public + * contract already collapses "absent" and "present raw-0 legacy" into + * DIFFERENT return values (0 vs WAL_LEGACY_TERM respectively — see + * entry_term_locked). A wire value of exactly 0 can therefore only mean + * "this sender's checkpoint LSN is genuinely, permanently absent" (the + * expected, designed state for ANY real checkpoint — persist_write_ + * checkpoint_marker never records a term for its own entry). Before this + * fix, record_entry_term(p, checkpoint_lsn, 0) stored a RAW 0 — an EXPLICIT + * write, not a growth-fill, so it never got the TERM_INDEX_UNSET sentinel — + * and entry_term_locked's legacy-0 rule then read it back as + * WAL_LEGACY_TERM(1) forever, permanently diverging from the sender's own + * permanently-absent(0) value for the SAME LSN: a subsequent AppendEntries + * whose prev_log_index==checkpoint_lsn (the entry immediately following it) + * then mismatched logOk (0 != 1) forever — the identical wedge class + * bug-1475 fixed for WAL-streaming catch-up, reachable instead via + * HA_REPL_SEND_SNAPSHOT (dispatched whenever a standby has fallen too far + * behind for incremental streaming — a live, common path). Recording the + * SAME TERM_INDEX_UNSET sentinel here (instead of raw 0) keeps a genuinely- + * absent checkpoint boundary reading absent on the receiver too, matching + * the sender — while a genuinely non-zero checkpoint_term (a real historical + * term, however it arrived on the wire) is still recorded verbatim and still + * correctly overwrites any stale local term at this LSN, unchanged. */ void persist_reconcile_checkpoint_term(persist_t* p, uint64_t checkpoint_lsn, uint64_t checkpoint_term) { if (!p || checkpoint_lsn == 0) return; + uint64_t stored_term = + (checkpoint_term == 0) ? TERM_INDEX_UNSET : checkpoint_term; + pthread_mutex_lock(&p->lock); - record_entry_term(p, checkpoint_lsn, checkpoint_term); + record_entry_term(p, checkpoint_lsn, stored_term); pthread_mutex_unlock(&p->lock); } @@ -1628,8 +1781,17 @@ static int persist_write_checkpoint_marker(persist_t* p) * [uint32_t job_count] * [job_count * { uint32_t payload_len; uint8_t capnp_Job_bytes[payload_len] }] * [uint32_t queue_count] - * [queue_count * { uint32_t name_len; char name[name_len]; uint32_t status }] */ -#define SNAPSHOT_FORMAT_VERSION 1u + * [queue_count * { uint32_t name_len; char name[name_len]; uint32_t status }] + * + * config-upgrade-snapshot task 1 (Req 1.9, 5.7): bumped 1->2 to reserve the + * version for the HostAdminState/QueueAdminState capnp migration -- the + * queue-frame layout above (name_len/name/status raw bytes) is the PRIOR + * layout this version now hard-rejects; the byte-layout migration itself + * (new host section, queue frames re-encoded as capnp) lands in tasks + * 2.1/2.2. A binary built against version 2 must never misinterpret a + * checkpoint written under version 1's raw queue-frame layout (Design + * Invariant 4: fail loud, never silently reinterpret). */ +#define SNAPSHOT_FORMAT_VERSION 2u typedef struct { uint8_t* buf; @@ -1750,15 +1912,15 @@ static int collect_job_frames(persist_t* p, xlist_t* frames) return rc; } -/* Queue admin-status frame (ha-entity-snapshots task 3.2, Req 1.1). Unlike - * jobs, a queue's on-disk frame carries no capnp payload at all -- it is a - * plain (name, status) pair, the entirety of restore_queue_state's contract - * (queue.c:208). `name` is a malloc'd, NUL-terminated copy; the on-disk - * frame itself carries no NUL (design.md "Checkpoint File Layout": - * `{ uint32_t name_len; char name[name_len]; uint32_t status }`). */ +/* Queue admin-status frame (config-upgrade-snapshot task 2.2, Req 1.9, 5.7). + * Migrated from the prior raw {name_len, name, status} layout to a capnp + * QueueAdminState payload -- identical {buf,len} shape to snap_host_frame_t + * (both carry a capnp payload), same (name, status) field content as + * before, restore_queue_state's contract (queue.c:208) unchanged; only the + * wire encoding changes (design.md "Snapshot Entity/Config Payload"). */ typedef struct { - char* name; - uint32_t status; + uint8_t* buf; + uint32_t len; } snap_queue_frame_t; static void snap_free_queue_frames(xlist_t* frames) @@ -1766,21 +1928,21 @@ static void snap_free_queue_frames(xlist_t* frames) for (int i = 0; i < frames->count; i++) { snap_queue_frame_t* fr = (snap_queue_frame_t*)xlist_get(frames, i); if (fr) { - free(fr->name); + free(fr->buf); free(fr); } } xlist_fini(frames); } -/* Collect every queue in `frames`, one malloc'd snap_queue_frame_t per - * queue, under the same point-in-time-consistent walk discipline as +/* Collect + encode every queue in `frames`, one malloc'd snap_queue_frame_t + * per queue, under the same point-in-time-consistent walk discipline as * collect_job_frames above (design.md "Existing Architecture Analysis" / * Requirement 1.2): the qmgr table's own RTTI_LOCK_READ is held for the * ENTIRE walk, and each queue's own RTTI_LOCK_READ is ADDITIONALLY taken - * nested around just that queue's (name, status) read -- mirroring - * restore_queue_state's own per-entity lock pattern on the load side. No - * lock is held during the disk write itself. + * nested around just that queue's (name, status) read and capnp encode -- + * mirroring collect_host_frames' identical lock-then-encode-then-unlock + * shape. No lock is held during the disk write itself. * * Unlike collect_job_frames, no retention predicate is applied: a queue's * mere presence in the live qmgr table already means config provisioned @@ -1789,10 +1951,10 @@ static void snap_free_queue_frames(xlist_t* frames) * * Returns 0 on success (frames populated; `frames` is always left * xlist_init'd, even for zero results, so the caller can always xlist_fini - * it) or a negative errno on the first failure (name allocation), in which - * case every frame collected so far has already been freed and `frames` - * is empty (Requirement 1.3: a mid-walk failure must not leave partial - * entity content behind). */ + * it) or a negative errno on the first encode failure, in which case every + * frame collected so far has already been freed and `frames` is empty + * (Requirement 1.3: a mid-walk failure must not leave partial entity + * content behind). */ static int collect_queue_frames(persist_t* p, xlist_t* frames) { cluster_t* c = p->cluster; @@ -1822,29 +1984,32 @@ static int collect_queue_frames(persist_t* p, xlist_t* frames) if (q == NULL) continue; - char* name; - uint32_t status; + capnp_queue_admin_state_t qs; + uint8_t* buf = NULL; + size_t sz = 0; + int enc_rc; lock(q, RTTI_LOCK_READ); - name = q->queue.queue ? strdup(q->queue.queue) : NULL; - status = q->queue.status; + qs.name = q->queue.queue; + qs.status = q->queue.status; + enc_rc = capnp_encode_queue_admin_state(&qs, &buf, &sz); unlock(q); - if (name == NULL) { - rc = -ENOMEM; + if (enc_rc != 0) { + rc = enc_rc; break; } snap_queue_frame_t* fr = (snap_queue_frame_t*)malloc(sizeof(*fr)); if (fr == NULL) { - free(name); + free(buf); rc = -ENOMEM; break; } - fr->name = name; - fr->status = status; + fr->buf = buf; + fr->len = (uint32_t)sz; if (xlist_store(frames, fr) < 0) { - free(name); + free(buf); free(fr); rc = -ENOMEM; break; @@ -1860,6 +2025,276 @@ static int collect_queue_frames(persist_t* p, xlist_t* frames) return rc; } +/* Bits set by admin commands that must survive a checkpoint round-trip. + * Mirrors worker.c's and lib/wobj.c's own local XCE_WORKER_ADMIN_MASK + * definitions -- both already independently duplicate this exact bit list + * (design.md Design Invariant 6 notes this pre-existing duplication); this + * is a third, deliberate copy for the same reason (no shared header exists + * for it today), not a new layering dependency on worker.c. */ +#define PERSIST_WORKER_ADMIN_MASK \ + (XCE_WORKER_LOCKEDU | XCE_WORKER_CLOSED | XCE_WORKER_HIDDEN \ + | XCE_WORKER_CLOSED_BY_ADMIN) + +typedef struct { + uint8_t* buf; + uint32_t len; +} snap_host_frame_t; + +static void snap_free_host_frames(xlist_t* frames) +{ + for (int i = 0; i < frames->count; i++) { + snap_host_frame_t* fr = (snap_host_frame_t*)xlist_get(frames, i); + if (fr) { + free(fr->buf); + free(fr); + } + } + xlist_fini(frames); +} + +/* Collect + encode every host in c->workermgr into `frames`, one malloc'd + * snap_host_frame_t (identical {buf,len} shape to snap_job_frame_t -- both + * carry a capnp payload) per host, under the same point-in-time-consistent + * walk discipline as + * collect_job_frames/collect_queue_frames above (design.md "Existing + * Architecture Analysis" / Requirement 1.2): the workermgr table's own + * RTTI_LOCK_READ is held for the ENTIRE walk, and each worker's own + * RTTI_LOCK_READ is ADDITIONALLY taken nested around just that host's + * (name, status) read and encode. No lock is held during the disk write + * itself. + * + * Like collect_queue_frames and UNLIKE collect_job_frames, no retention + * predicate is applied: every host currently in the live workermgr table + * gets exactly one frame (mirrors collect_queue_frames's own "mere presence + * already means it's included" precedent above), so restore later sees a + * frame for every host this member currently knows about, whether or not + * any admin bit happens to be set on it right now. + * + * Each frame carries ONLY the host's admin-issued status bits + * (w->host.status & PERSIST_WORKER_ADMIN_MASK) -- never the raw status + * (which also carries dynamic/liveness bits like XCE_WORKER_UNAVAIL) and + * never any other xce_worker_t field (attrs, resvals, dead_since, ...): + * Requirement 1.7's exclusion, design.md Design Invariant 5 (never inherit + * a live struct's dynamic fields just because reusing it is convenient -- + * capnp_encode_worker/Worker is deliberately NOT used here). `name` is + * read directly off w->host.name -- the same field key_find(c->workermgr, + * name) looks up elsewhere in this codebase (join.c:91, worker.c:524,645,751, + * lib/wobj.c:212), so a later restore's key_find(name) lookup matches + * exactly what was collected here. + * + * Returns 0 on success (frames populated; `frames` is always left + * xlist_init'd -- even zero results -- so the caller can always + * xlist_fini it) or a negative errno on the first encode failure, in which + * case every frame collected so far has already been freed and `frames` + * is empty (Requirement 1.3: a mid-walk failure must not leave partial + * entity content behind). */ +static int collect_host_frames(persist_t* p, xlist_t* frames) +{ + cluster_t* c = p->cluster; + int rc = 0; + + xlist_init(frames, 64); + + /* No live cluster back-pointer (e.g. a bare unit-test persist_t) -- + * zero hosts is not a failure. */ + if (c == NULL || c->workermgr == NULL) + return 0; + + lock(c->workermgr, RTTI_LOCK_READ); + + iterator_t it; + int irc = iter_make(&it, c->workermgr); + if (irc < 0) { + unlock(c->workermgr); + return 0; /* nothing to walk -- mirrors collect_job/queue_frames' empty-table handling */ + } + + for (;;) { + worker_t* w = NULL; + int nrc = iter_next(&it, (void**)&w); + if (nrc < 0 || nrc == RTTI_ITER_NO_DATA) + break; + if (w == NULL) + continue; + + capnp_host_admin_state_t h; + uint8_t* buf = NULL; + size_t sz = 0; + int enc_rc; + + lock(w, RTTI_LOCK_READ); + h.name = w->host.name; + h.status = w->host.status & PERSIST_WORKER_ADMIN_MASK; + enc_rc = capnp_encode_host_admin_state(&h, &buf, &sz); + unlock(w); + + if (enc_rc != 0) { + rc = enc_rc; + break; + } + + snap_host_frame_t* fr = (snap_host_frame_t*)malloc(sizeof(*fr)); + if (fr == NULL) { + free(buf); + rc = -ENOMEM; + break; + } + fr->buf = buf; + fr->len = (uint32_t)sz; + if (xlist_store(frames, fr) < 0) { + free(buf); + free(fr); + rc = -ENOMEM; + break; + } + } + + iter_destroy(&it); + unlock(c->workermgr); + + if (rc != 0) + snap_free_host_frames(frames); /* Requirement 1.3: discard, not partial */ + + return rc; +} + +/* Bound on the config bytes this file will embed in a checkpoint -- mirrors + * config_repl.h's CONF_MAX_SIZE (1 MiB) exactly. Duplicated as its own local + * constant rather than including config_repl.h, per the zero-config_repl.c- + * dependency decision documented on read_active_config_bytes() below. */ +#define PERSIST_CONFIG_BYTES_MAX_SIZE (1u * 1024u * 1024u) + +/* read_active_config_bytes (config-upgrade-snapshot task 2.3, Req 2.1, 2.3, + * 2.4, 5.1): read the locally-held active configuration's raw bytes straight + * off disk, for embedding in every checkpoint's trailing config-bytes + * section. + * + * DELIBERATE DESIGN CHOICE -- read this before changing the call site below: + * this function duplicates config_repl.c's `conf_read_current_filename` + + * `conf_read_raw` path-resolution-and-read logic INLINE, rather than calling + * those functions (config_repl.h is not included by this file at all). This + * mirrors scan_latest_committed_config_ref()'s own precedent just above, + * which independently decodes WAL_CONFIG_MARKER payloads inline "so persist + * stays free of a config_repl layering dependency" instead of adding a + * persist.c -> config_repl.c function-call edge -- and design.md's + * "Snapshot Entity/Config Payload" + File Structure Plan sections direct the + * SAME treatment here verbatim ("no new config_repl.c function is added... + * this deliberately mirrors scan_latest_committed_config_ref's own existing + * precedent of avoiding a persist.c -> config_repl.c function-call + * dependency, rather than introducing the layering violation a new accessor + * would create"). + * + * A future reader who spots ha.c's two `extern int conf_read_raw(...)` call + * sites (config push to standbys) and wonders why this file doesn't do the + * same: ha.c is the intentional CONSUMER of config-bytes sourcing + * (design.md's Architecture boundary map: "config replication (config_repl.c) + * owns config-bytes sourcing"), so a ha.c -> config_repl.c call is expected, + * in-boundary integration. persist.c owns materialization/on-disk-format and + * is deliberately kept free of any dependency on config_repl.c's domain -- + * the same boundary this file already draws for the WAL-marker case above. + * This is a considered choice, not an oversight: duplicating this ~30-line + * read-with-validation routine once was judged cheaper than adding this + * file's first cross-domain coupling edge into config_repl.c. + * + * Returns 0 with *out_bytes (caller must free()) / *out_len set on success. + * Returns -ENOENT when no local config bytes exist yet: no cluster/myconf + * back-pointer (e.g. a bare unit-test persist_t), no workdir/name configured, + * no conf/current pointer file yet (this node has not received its first + * config push), or the pointer names a versioned file that is not present. + * This is a BENIGN, expected state (early boot / not-yet-provisioned), never + * corruption -- callers must treat -ENOENT as "no config yet", not failure. + * Any OTHER negative errno (-EINVAL malformed pointer/oversized file, -EIO + * read failure, -ENOMEM, -EFBIG) indicates genuine on-disk corruption or a + * real I/O failure and must propagate as a hard failure, never be silently + * downgraded to an empty section. */ +static int read_active_config_bytes(persist_t* p, uint8_t** out_bytes, + size_t* out_len) +{ + cluster_t* c = p->cluster; + if (c == NULL || c->myconf == NULL || + c->myconf->workdir == NULL || c->myconf->name == NULL) + return -ENOENT; + + /* effective_dir = workdir/name -- must match conf_save_config's own + * path construction (config_repl.c:781) exactly. */ + char conf_dir[4096]; + snprintf(conf_dir, sizeof(conf_dir), "%s/%s", c->myconf->workdir, + c->myconf->name); + + /* Step 1: resolve the "current" versioned filename -- mirrors + * conf_read_current_filename's validation exactly (non-empty, no path + * separator, "cluster.bin." prefix + 12 lowercase hex chars) so a + * corrupted pointer file is caught here just as loudly as it would be + * there. */ + char head_path[4160]; + snprintf(head_path, sizeof(head_path), "%s/conf/current", conf_dir); + + FILE* hf = fopen(head_path, "r"); + if (hf == NULL) + return -ENOENT; /* no config pushed to this node yet */ + + struct stat hst; + if (fstat(fileno(hf), &hst) == 0 && hst.st_size == 0) { + fclose(hf); + return -ENOENT; /* interrupted-write pointer file -- treat as absent */ + } + + char fname[256]; + if (fgets(fname, (int)sizeof(fname), hf) == NULL) { + fclose(hf); + return -EIO; + } + fclose(hf); + fname[strcspn(fname, "\n")] = '\0'; + + if (strchr(fname, '/') != NULL) + return -EINVAL; /* corrupted pointer file -- embedded path separator */ + if (strncmp(fname, "cluster.bin.", 12) != 0) + return -EINVAL; + const char* hex = fname + 12; + if (strlen(hex) != 12 || strspn(hex, "0123456789abcdef") != 12) + return -EINVAL; + + /* Step 2: read the versioned config file's raw bytes. */ + char cfg_path[4416]; + snprintf(cfg_path, sizeof(cfg_path), "%s/conf/%s", conf_dir, fname); + + FILE* cf = fopen(cfg_path, "rb"); + if (cf == NULL) + return -ENOENT; /* pointer references a file that is not there -- + * treat as not-yet-ready rather than corruption */ + + if (fseek(cf, 0, SEEK_END) != 0) { fclose(cf); return -EIO; } + long sz = ftell(cf); + if (sz < 0) { fclose(cf); return -EIO; } + if (fseek(cf, 0, SEEK_SET) != 0) { fclose(cf); return -EIO; } + + if (sz == 0) { + fclose(cf); + return -EIO; /* zero-byte versioned config file: genuine corruption */ + } + if ((size_t)sz > PERSIST_CONFIG_BYTES_MAX_SIZE) { + fclose(cf); + return -EFBIG; + } + + uint8_t* buf = (uint8_t*)malloc((size_t)sz); + if (buf == NULL) { + fclose(cf); + return -ENOMEM; + } + if (fread(buf, 1, (size_t)sz, cf) != (size_t)sz) { + free(buf); + fclose(cf); + return -EIO; + } + fclose(cf); + + *out_bytes = buf; + *out_len = (size_t)sz; + return 0; +} + /* Write an entity-bearing checkpoint: legacy header (unchanged) + entity * payload (ha-entity-snapshots task 2.2/3.2, Req 1.1-1.4, 3.1-3.3). Any * failure at any step -- collect, encode, write, sync -- leaves NO file at @@ -1890,10 +2325,19 @@ static int write_snapshot(persist_t* p) return rc; } + xlist_t host_frames; + rc = collect_host_frames(p, &host_frames); + if (rc != 0) { + snap_free_job_frames(&job_frames); + snap_free_queue_frames(&queue_frames); + return rc; + } + int fd = open(tmp_path, O_CREAT | O_WRONLY | O_TRUNC, 0600); if (fd < 0) { snap_free_job_frames(&job_frames); snap_free_queue_frames(&queue_frames); + snap_free_host_frames(&host_frames); return -errno; } @@ -1940,9 +2384,11 @@ static int write_snapshot(persist_t* p) } } - /* Queue trailer (ha-entity-snapshots task 3.2, Req 1.1, 1.2): plain - * (name, status) frames, no capnp -- matches restore_queue_state's - * exact contract (design.md "Checkpoint File Layout"). */ + /* Queue trailer (config-upgrade-snapshot task 2.2, Req 1.9, 5.7): + * capnp QueueAdminState frames, same [payload_len][capnp bytes] shape + * as the job/host frame loops -- migrated from the prior raw + * {name_len, name, status} layout (design.md "Checkpoint File Layout": + * same field content, new wire encoding only). */ if (rc == 0) { uint32_t queue_count = (uint32_t)queue_frames.count; if (write(fd, &queue_count, sizeof(queue_count)) != (ssize_t)sizeof(queue_count)) @@ -1951,28 +2397,95 @@ static int write_snapshot(persist_t* p) for (int i = 0; rc == 0 && i < queue_frames.count; i++) { snap_queue_frame_t* fr = (snap_queue_frame_t*)xlist_get(&queue_frames, i); - uint32_t name_len = (uint32_t)strlen(fr->name); - if (write(fd, &name_len, sizeof(name_len)) != (ssize_t)sizeof(name_len)) { + if (write(fd, &fr->len, sizeof(fr->len)) != (ssize_t)sizeof(fr->len)) { rc = -EIO; break; } - if (name_len > 0 && - write(fd, fr->name, name_len) != (ssize_t)name_len) { - rc = -EIO; - break; - } - if (write(fd, &fr->status, sizeof(fr->status)) != (ssize_t)sizeof(fr->status)) { + if (write(fd, fr->buf, fr->len) != (ssize_t)fr->len) { rc = -EIO; break; } } + /* Host trailer (config-upgrade-snapshot task 2.1, Req 1.6, 1.7, 1.9): + * capnp HostAdminState frames, same [payload_len][capnp bytes] shape as + * the job frame loop above (design.md "Checkpoint File Layout": host + * frames come after queue frames). */ + if (rc == 0) { + uint32_t host_count = (uint32_t)host_frames.count; + if (write(fd, &host_count, sizeof(host_count)) != (ssize_t)sizeof(host_count)) + rc = -EIO; + } + + for (int i = 0; rc == 0 && i < host_frames.count; i++) { + snap_host_frame_t* fr = (snap_host_frame_t*)xlist_get(&host_frames, i); + if (write(fd, &fr->len, sizeof(fr->len)) != (ssize_t)sizeof(fr->len)) { + rc = -EIO; + break; + } + if (write(fd, fr->buf, fr->len) != (ssize_t)fr->len) { + rc = -EIO; + break; + } + } + + /* Config-bytes section (config-upgrade-snapshot task 2.3, Req 2.1, 2.3, + * 2.4, 5.1): raw active-configuration bytes, appended LAST. This is a + * single flat length-prefixed blob for the whole file -- NOT a + * [count][frame...] shape like the job/queue/host sections above, since + * there is exactly one active configuration, never a set of them. + * Populated on EVERY checkpoint (marker-triggered or periodic alike, + * never gated on which triggered this call) so a member joining or + * catching up after the marker-triggered upgrade snapshot has rotated + * away still gets configuration and materialized state together from + * whichever checkpoint it installs (Req 2.4). A pure function of + * whatever bytes currently sit at the resolved config path -- no + * timestamp, no ordering dependence -- so reading the same unchanged + * file twice yields byte-identical output (Req 5.1 determinism). */ + uint8_t* cfg_bytes = NULL; + size_t cfg_len = 0; + if (rc == 0) { + int cfg_rc = read_active_config_bytes(p, &cfg_bytes, &cfg_len); + if (cfg_rc == -ENOENT) { + /* No local config bytes yet -- no cluster/myconf back-pointer + * (bare unit-test persist_t) or this node has not received its + * first config push. Mirrors the "no live cluster back-pointer" + * empty-is-not-failure discipline collect_job/queue/host_frames + * already apply above: write an explicit zero-length section + * rather than failing the whole checkpoint over a benign, + * expected early-boot / not-yet-provisioned state. */ + cfg_bytes = NULL; + cfg_len = 0; + } else if (cfg_rc != 0) { + /* Any other error means genuinely corrupt/unreadable on-disk + * config state, not benign absence -- fail the checkpoint like + * any other collect/restore failure (design.md Error Handling: + * "Host placeholder creation failure ... treated as any other + * collect/restore failure today -- discard partial state, fail + * the checkpoint/restore attempt, retriable on the next + * cycle"). */ + rc = cfg_rc; + } + } + + if (rc == 0) { + uint32_t cfg_bytes_len = (uint32_t)cfg_len; + if (write(fd, &cfg_bytes_len, sizeof(cfg_bytes_len)) != + (ssize_t)sizeof(cfg_bytes_len)) + rc = -EIO; + } + if (rc == 0 && cfg_len > 0 && + write(fd, cfg_bytes, cfg_len) != (ssize_t)cfg_len) + rc = -EIO; + free(cfg_bytes); + if (rc == 0 && fdatasync(fd) != 0) rc = -errno; close(fd); snap_free_job_frames(&job_frames); snap_free_queue_frames(&queue_frames); + snap_free_host_frames(&host_frames); if (rc != 0) { unlink(tmp_path); @@ -2255,6 +2768,51 @@ static void schedule_checkpoint(persist_t* persist) checkpoint_task_fn, persist); } +/* ------------------------------------------------------------------ */ +/* Checkpoint core (shared by persist_checkpoint and the marker-apply */ +/* trigger, config-upgrade-snapshot task 5) */ +/* ------------------------------------------------------------------ */ + +/* persist_checkpoint_write_locked: pin checkpoint_lsn to the EXPLICIT + * `checkpoint_lsn` given (never re-derived internally from + * last_applied_lsn), capture the committed-config reference, and serialize + * live state to a snapshot file. + * + * Caller MUST already hold apply_pump_lock (or otherwise guarantee no + * concurrent apply-pump walk can be racing this call, e.g. the + * single-threaded boot-replay window persist_recover() already documents + * elsewhere in this file) -- this function never locks or unlocks + * apply_pump_lock itself, so it is safe to call both from a context that + * already holds it (the live apply pump) and from a context where no lock + * is needed at all (boot replay). + * + * The explicit-lsn parameter exists because the two callers need two + * different values at two different moments: + * - persist_checkpoint() (periodic/explicit trigger): last_applied_lsn, + * read fresh by the caller immediately before this call. + * - the marker-apply trigger (apply_committed_entry's WAL_CONFIG_MARKER + * case): the marker's OWN lsn -- last_applied_lsn is NOT yet advanced + * to the marker's position at the moment that case runs (both live + * apply and replay advance it strictly AFTER dispatching this call), + * so reading last_applied_lsn from inside that case would mislabel the + * checkpoint with the marker's PREDECESSOR's lsn, not its own. */ +static int persist_checkpoint_write_locked(persist_t* p, + uint64_t checkpoint_lsn) +{ + p->checkpoint_lsn = checkpoint_lsn; + + /* Capture the latest committed config-marker reference BEFORE trimming + * (ha-term-safety task 4.2 r1): trim_wal_segments (run by both callers, + * after this function returns) can unlink the segment holding a + * committed WAL_CONFIG_MARKER, so the derived committed config must be + * cached durably (into the sentinel) before that happens. */ + scan_latest_committed_config_ref(p); + + /* Serialize in-memory state to a snapshot file (P0: no live kvmgrs — + * writes sentinel header + cached config ref). */ + return write_snapshot(p); +} + /* ------------------------------------------------------------------ */ /* Public: persist_checkpoint */ /* ------------------------------------------------------------------ */ @@ -2291,18 +2849,8 @@ int persist_checkpoint(persist_t* p) * the label ever claiming more than jobmgr actually holds. */ pthread_mutex_lock(&p->apply_pump_lock); - p->checkpoint_lsn = atomic_load_explicit(&p->last_applied_lsn, - memory_order_acquire); - - /* 3a. Capture the latest committed config-marker reference BEFORE trimming - * (ha-term-safety task 4.2 r1): the trim below can unlink the segment - * holding a committed WAL_CONFIG_MARKER, so the derived committed config - * must be cached durably (into the sentinel) before that happens. */ - scan_latest_committed_config_ref(p); - - /* 3b. Serialize in-memory state to a snapshot file - * (P0: no live kvmgrs — writes sentinel header + cached config ref) */ - rc = write_snapshot(p); + rc = persist_checkpoint_write_locked( + p, atomic_load_explicit(&p->last_applied_lsn, memory_order_acquire)); pthread_mutex_unlock(&p->apply_pump_lock); @@ -2320,14 +2868,76 @@ done: return rc; } +/* persist_checkpoint_marker_triggered (config-upgrade-snapshot task 5, Req + * 1.1, 1.5, 1.8, 4.4, 5.2, 5.3): force an immediate checkpoint at exactly + * `marker_lsn` -- the configuration-change marker's OWN lsn -- called from + * apply_committed_entry's WAL_CONFIG_MARKER case. + * + * Unlike persist_checkpoint(), this function NEVER locks apply_pump_lock: + * it relies entirely on the caller's own locking context, because the two + * production call sites of apply_committed_entry() differ in that context + * and this function must be correct under BOTH without deadlocking under + * either: + * - persist_apply_pump_run() (live online-apply, both primary and + * standby route through this) holds apply_pump_lock across its ENTIRE + * per-LSN dispatch loop, including the call into apply_committed_entry + * that reaches this function. Re-locking that same, non-recursive + * mutex here would self-deadlock -- so this function must NOT lock it; + * it is already held by the caller for the whole duration of this call. + * - replay_wal() (boot/restart replay, persist_recover()'s sole caller) + * does NOT hold apply_pump_lock during its per-entry dispatch loop -- + * by design, since persist_recover() runs before the apply pump is + * ever kicked and nothing else can be racing it (see persist_recover's + * own doc comment on its brief, unrelated apply_pump_lock use for + * cache invalidation). No lock is needed here either, for the same + * reason. + * Both call sites are internal to persist.c and fully controlled, so this + * documented precondition (caller already serializes, one way or another) + * is safe to rely on rather than adding a redundant/ambiguous lock here. + * + * Shares checkpoint_in_progress -- the SAME single-in-flight CAS guard + * persist_checkpoint() uses -- so a concurrent WAL-threshold-triggered + * periodic checkpoint and this marker-triggered one can never both + * proceed at once (Req 5.3). Returns -EBUSY when that guard is already + * held by someone else; the caller (apply_committed_entry) treats that as + * an expected, self-resolving condition, not a failure (Req 4.4) -- the + * in-flight checkpoint (whichever triggered it) still completes and + * either it or a later checkpoint picks up this marker's configuration + * (every checkpoint embeds the currently active configuration, task 2.3). */ +static int persist_checkpoint_marker_triggered(persist_t* p, + uint64_t marker_lsn) +{ + if (atomic_exchange(&p->checkpoint_in_progress, 1) != 0) + return -EBUSY; + + int rc = persist_write_checkpoint_marker(p); + if (rc == 0) + rc = persist_checkpoint_write_locked(p, marker_lsn); + + if (rc == 0) { + trim_wal_segments(p); + rotate_snapshots(p); + } + + atomic_store(&p->checkpoint_in_progress, 0); + return rc; +} + /* ------------------------------------------------------------------ */ /* Recovery internals */ /* ------------------------------------------------------------------ */ -/* Parse and restore every job frame then every queue frame from the entity - * payload beginning at the current `fd` offset (design.md "Checkpoint File - * Layout"): [job_count][job_count * {payload_len; capnp Job bytes}] - * [queue_count][queue_count * {name_len; name; status}]. +/* Parse and restore every job frame, then every queue frame, then every host + * frame from the entity payload beginning at the current `fd` offset + * (design.md "Checkpoint File Layout", SNAPSHOT_FORMAT_VERSION=2): + * [job_count][job_count * {payload_len; capnp Job bytes}] + * [queue_count][queue_count * {payload_len; capnp QueueAdminState bytes}] + * [host_count][host_count * {payload_len; capnp HostAdminState bytes}] + * A trailing config-bytes section follows the host section in the file + * (config-upgrade-snapshot task 2.3) but is deliberately NOT read here -- + * out of this function's scope; any bytes after the host section are simply + * left unread, exactly as host-frame bytes were already tolerated as + * present-but-unread before this function grew a host section of its own. * * `file_size` is the checkpoint file's total size (from fstat) and * `consumed` is the number of bytes already read from it (legacy header + @@ -2337,8 +2947,13 @@ done: * length must fail fast, not drive an oversized read). * * Restores in file order: every job via restore_job, then every queue via - * restore_queue_state (design.md sequence diagram). Returns 0 only if every - * frame restored; on the FIRST failure of any kind (short read, oversized + * restore_queue_state, then every host via restore_host_state + * (config-upgrade-snapshot task 4, Req 1.10 — design.md sequence diagram + * and "Referential integrity" note: restore order does not matter + * functionally, since re-homing decisions are already baked into each + * entity's encoded content at materialization time, never re-derived at + * restore time, Design Invariant 2). Returns 0 only if every frame + * restored; on the FIRST failure of any kind (short read, oversized * length, decode error, or restore error) returns immediately with a * negative errno — the caller MUST NOT commit any position change on a * non-zero return (Requirement 2.3). @@ -2347,9 +2962,12 @@ done: * own documented idempotent-replay guard (job already present), needed so a * retried load — after an earlier partial attempt already created some jobs * before failing on a later one — can continue past already-restored entries - * rather than aborting on them again. restore_queue_state has no such - * idempotent-duplicate case (re-applying the same status is already a - * harmless overwrite), so any non-zero return from it is a genuine failure. */ + * rather than aborting on them again. restore_queue_state and + * restore_host_state have no such idempotent-duplicate case of their own to + * special-case here (re-applying the same status is already a harmless + * overwrite/OR, and restore_host_state's create-if-missing placeholder path + * is independently idempotent under retry — Requirement 5.8, worker.c), so + * any non-zero return from either is a genuine failure. */ static int load_snapshot_entities(int fd, off_t file_size, off_t consumed, persist_t* p, uint64_t stored_lsn) { @@ -2396,45 +3014,123 @@ static int load_snapshot_entities(int fd, off_t file_size, off_t consumed, return -EINVAL; /* entities present but nowhere to restore them into */ for (uint32_t i = 0; i < queue_count; i++) { - uint32_t name_len = 0; - if (read(fd, &name_len, sizeof(name_len)) != (ssize_t)sizeof(name_len)) + uint32_t payload_len = 0; + if (read(fd, &payload_len, sizeof(payload_len)) != + (ssize_t)sizeof(payload_len)) return -EIO; - consumed += (off_t)sizeof(name_len); + consumed += (off_t)sizeof(payload_len); - if (name_len == 0 || (off_t)name_len > file_size - consumed) + if (payload_len == 0 || (off_t)payload_len > file_size - consumed) return -EIO; - char* name = (char*)malloc((size_t)name_len + 1); - if (name == NULL) + uint8_t* buf = (uint8_t*)malloc(payload_len); + if (buf == NULL) return -ENOMEM; - if (read(fd, name, name_len) != (ssize_t)name_len) { - free(name); + if (read(fd, buf, payload_len) != (ssize_t)payload_len) { + free(buf); return -EIO; } - name[name_len] = '\0'; - consumed += (off_t)name_len; + consumed += (off_t)payload_len; - uint32_t status = 0; - if (read(fd, &status, sizeof(status)) != (ssize_t)sizeof(status)) { - free(name); - return -EIO; - } - consumed += (off_t)sizeof(status); + /* Decode the capnp QueueAdminState frame (config-upgrade-snapshot + * task 4, Req 1.9/5.7 decode side — migrated off the prior raw + * {name_len, name, status} layout collect_queue_frames stopped + * writing in task 2.2). Mirrors the WAL_JOB_SUBMIT re-decode block + * above in this file (capn_init_mem/capn_getp/read_*) and + * test_persist_snapshot_entities.c's own + * snapent_read_checkpoint_queues reader exactly. */ + struct capn c_ctx; + capn_init_mem(&c_ctx, buf, payload_len, 0); + QueueAdminState_ptr qp; + qp.p = capn_getp(capn_root(&c_ctx), 0, 1); + struct QueueAdminState cq; + memset(&cq, 0, sizeof(cq)); + read_QueueAdminState(&cq, qp); - int qrc = restore_queue_state(p->cluster, name, status); - free(name); + capnp_queue_admin_state_t decoded; + memset(&decoded, 0, sizeof(decoded)); + decode_QueueAdminState(&decoded, &cq); + capn_free(&c_ctx); + free(buf); + + int qrc = restore_queue_state(p->cluster, decoded.name, decoded.status); + free_QueueAdminState(&decoded); if (qrc != 0) return qrc; } + /* Host section (config-upgrade-snapshot task 4, Req 1.10): new in + * SNAPSHOT_FORMAT_VERSION=2, added after the queue section (design.md + * "Checkpoint File Layout"). Same [payload_len][capnp bytes] per-frame + * shape as the job/queue sections above. Every host frame dispatches + * to restore_host_state (worker.c, task 3), which is create-if-missing + * (a worker_t is join-provisioned, not config-provisioned like a queue + * — Design Invariant 1) and idempotent under retry on its own + * (Requirement 5.8), so this loop applies the exact same "any failure + * returns immediately" discipline as the job/queue loops above without + * needing any extra idempotency handling here. */ + uint32_t host_count = 0; + if (read(fd, &host_count, sizeof(host_count)) != + (ssize_t)sizeof(host_count)) + return -EIO; + consumed += (off_t)sizeof(host_count); + + if (host_count > 0 && + (p->cluster == NULL || p->cluster->workermgr == NULL)) + return -EINVAL; /* entities present but nowhere to restore them into */ + + for (uint32_t i = 0; i < host_count; i++) { + uint32_t payload_len = 0; + if (read(fd, &payload_len, sizeof(payload_len)) != + (ssize_t)sizeof(payload_len)) + return -EIO; + consumed += (off_t)sizeof(payload_len); + + if (payload_len == 0 || (off_t)payload_len > file_size - consumed) + return -EIO; + + uint8_t* buf = (uint8_t*)malloc(payload_len); + if (buf == NULL) + return -ENOMEM; + if (read(fd, buf, payload_len) != (ssize_t)payload_len) { + free(buf); + return -EIO; + } + consumed += (off_t)payload_len; + + /* Decode the capnp HostAdminState frame -- mirrors the queue decode + * block immediately above and + * test_persist_snapshot_entities.c's snapent_read_checkpoint_hosts + * reader exactly. */ + struct capn c_ctx; + capn_init_mem(&c_ctx, buf, payload_len, 0); + HostAdminState_ptr hp; + hp.p = capn_getp(capn_root(&c_ctx), 0, 1); + struct HostAdminState ch; + memset(&ch, 0, sizeof(ch)); + read_HostAdminState(&ch, hp); + + capnp_host_admin_state_t decoded; + memset(&decoded, 0, sizeof(decoded)); + decode_HostAdminState(&decoded, &ch); + capn_free(&c_ctx); + free(buf); + + int hrc = restore_host_state(p->cluster, decoded.name, decoded.status); + free_HostAdminState(&decoded); + if (hrc != 0) + return hrc; + } + return 0; } /* Load a snapshot: legacy header (magic + checkpoint_lsn + optional - * config-ref tail), then — for an entity-bearing checkpoint — every job and - * queue frame that follows it (ha-entity-snapshots task 5.2, Requirements - * 2.1-2.4, 5.1, 5.2). See design.md "load_snapshot (extended)" and its - * sequence diagram for the exact contract this implements. + * config-ref tail), then — for an entity-bearing checkpoint — every job, + * queue, and host frame that follows it (ha-entity-snapshots task 5.2, + * config-upgrade-snapshot task 4; Requirements 2.1-2.4, 5.1, 5.2, 1.10). + * See design.md "load_snapshot (extended)" and its sequence diagram for the + * exact contract this implements. * * Ordering (Requirement 2.1, 2.2, 2.3 — restore FIRST, validate FULLY, THEN * advance position, never the reverse, never partial): the header and any @@ -2443,16 +3139,18 @@ static int load_snapshot_entities(int fd, off_t file_size, off_t consumed, * discriminator — not a flag bit). A short file (nothing remains) is a * legacy, pre-feature checkpoint: not an error, so its recorded position is * committed immediately and *out_entities_restored is false. Otherwise every - * job then every queue frame is restored via load_snapshot_entities() before - * ANYTHING is written to p->checkpoint_lsn/p->current_lsn/p->cfgref_*; on - * any restore failure this function returns non-zero with p's fields - * PROVABLY untouched (the single commit point below is only ever reached - * after load_snapshot_entities() returns 0). *out_entities_restored is only - * set on a rc==0 return, matching persist.h's documented contract. + * job, then every queue, then every host frame is restored via + * load_snapshot_entities() before ANYTHING is written to + * p->checkpoint_lsn/p->current_lsn/p->cfgref_*; on any restore failure this + * function returns non-zero with p's fields PROVABLY untouched (the single + * commit point below is only ever reached after load_snapshot_entities() + * returns 0). *out_entities_restored is only set on a rc==0 return, matching + * persist.h's documented contract. * * Returns 0 on success, -EINVAL on bad magic / unrecognized entity format, * -EIO on a short/corrupt read, -ENOMEM on allocation failure, -errno on - * open/fstat failure, or a restore_job/restore_queue_state error code. */ + * open/fstat failure, or a restore_job/restore_queue_state/restore_host_state + * error code. */ static int load_snapshot(persist_t* p, const char* path, uint64_t lsn, bool* out_entities_restored) { @@ -2748,6 +3446,33 @@ int apply_wal_entry(persist_t* p, uint32_t type, uint64_t lsn, * SYNCHRONOUSLY on this exact call stack, from this exact function. */ static _Thread_local bool t_apply_seam_notifying = false; +#ifdef XCE_TESTING +/* config-upgrade-snapshot task 8.1 (Req 6.3): deterministic fault-injection + * seam at the marker-apply-to-checkpoint-durable boundary, for later use by + * a crash/restart regression (task 8.7): "force a controller crash/restart + * between a configuration-change marker's commit and that member's own + * snapshot write becoming durable, and assert materialization resumes + * correctly from the marker on restart." When non-NULL AND it returns + * nonzero for the marker's own (p, lsn), the WAL_CONFIG_MARKER case below + * skips its call into persist_checkpoint_marker_triggered() entirely -- + * simulating "the process crashes here, before the checkpoint write becomes + * durable" (a real crash simply stops the process; the checkpoint call + * never runs either way). The skip is deliberately routed through the SAME + * rc!=0 handling an actual checkpoint failure already takes below (not a + * new branch): last_applied_lsn is not advanced past this marker, so the + * next kick/retry -- or, after a genuine restart, boot replay's independent + * call into this same case (already proven idempotent by + * test_marker_apply_retry_is_idempotent) -- resumes materialization from + * the marker fresh, exactly matching Requirement 5.2's crash-safety + * contract. NULL in production -- no behaviour change. Mirrors + * ha_stream_body_read_fault_hook's shape (config_repl.c) and this same + * spec's own xce_upgrade_marker_committed_hook placement convention + * (defined here at file scope, declared extern in whichever test file + * needs it -- never in a header). */ +int (*persist_marker_checkpoint_fault_hook)(persist_t *p, + uint64_t marker_lsn) = NULL; +#endif + int apply_committed_entry(persist_t* p, uint32_t wal_type, uint64_t lsn, const void* payload, uint32_t len) { @@ -3123,10 +3848,221 @@ int apply_committed_entry(persist_t* p, uint32_t wal_type, uint64_t lsn, return 0; } + case WAL_CONFIG_MARKER: { + /* config-upgrade-snapshot task 5 (Req 1.1, 1.5, 1.8): force an + * immediate, deterministic checkpoint at exactly this marker's own + * (term, lsn) boundary, materializing the upgrade snapshot the + * moment every member applies the marker -- primary online-apply, + * standby online-apply, and boot/restart replay alike, since this + * one unified apply seam is exactly what all three route through + * (design.md "Architecture" / "Key simplification found during + * design": no new leader-specific "resume" logic is needed either, + * since a newly-elected leader satisfies this the same way, by + * continuing to apply its own committed log). + * + * Deliberately does NOT touch entity interpretation/re-homing + * (lost_and_found etc.) -- Req 1.8 requires apply and activation to + * stay separate steps; this case's only effect is materialization, + * identical in kind to any other checkpoint. + * + * persist_checkpoint_marker_triggered() (not a bare + * persist_checkpoint() call) is required here to avoid two real + * hazards a naive direct call would hit: + * 1. Lock reentrancy: persist_apply_pump_run() (the live pump's + * call site for online-apply, both primary and standby) holds + * apply_pump_lock across this entire dispatch call; + * persist_checkpoint()'s own body re-acquires that same, + * non-recursive mutex, which would self-deadlock. + * persist_checkpoint_marker_triggered() never locks + * apply_pump_lock itself -- see its own doc comment for why + * that is safe under both production call sites. + * 2. Stale checkpoint_lsn: both live-apply and replay advance + * last_applied_lsn AFTER this dispatch call returns, never + * before (persist_apply_pump_run / replay_wal), so reading + * last_applied_lsn from inside this case would capture the + * PRECEDING entry's lsn, not the marker's own, mislabeling the + * checkpoint. `lsn` (this function's own parameter) is + * already the marker's exact position, so it is passed + * through explicitly instead of re-derived. */ + /* bug-1469 fix (live HA soak, config-upgrade-snapshot task 8.6): + * unconditionally re-run config activation right here, BEFORE the + * forced checkpoint below, so EVERY member -- primary, standby, and + * any future newly-elected leader -- is guaranteed to have + * refreshed c->myconf (and the runtime queue/host tables + * load_primary_config provisions from it) from disk BEFORE the + * checkpoint writer walks that same runtime state to build the + * queue-entity list. Before this call existed at all, + * config_activate_committed() was reachable from exactly two + * places: handle_repl_config_push (a STANDBY receiving a push) and + * the boot/recovery path -- never from a member's own live apply of + * the marker it just committed. A live 3-node chaotic-kill soak + * caught the gap empirically: the primary that ORIGINATED a config + * upgrade (do_upgrade_config_with_bytes, which saves the new bytes + * to disk and bumps config_generation but never re-activates them + * into c->myconf on itself) forced a checkpoint at the marker's own + * LSN whose queue-entity section still reflected the OLD + * (pre-upgrade) queue set, then was killed before any LATER, + * independent event (restart, or a racing inbound push) happened to + * call config_activate_committed -- freezing a stale + * queue-entity list into that checkpoint forever (a real + * cross-member materialized-state divergence, + * .wolf/buglog.json bug-1469's byte-level trace: the checkpoint's + * embedded raw config-bytes section correctly carried the new + * bytes, but the SEPARATE queue-entity list section -- built by + * walking runtime state, not the raw bytes -- did not, because that + * runtime state was never refreshed before the write). + * + * MUST run BEFORE persist_checkpoint_marker_triggered(), not merely + * before upgrade_materialization_verify: the checkpoint writer + * (write_snapshot -> collect_queue_frames/collect_host_frames) + * builds its queue/host-entity sections by walking c->qmgr/ + * c->workermgr -- LIVE RUNTIME TABLES, populated at boot from + * c->myconf->cluster_config and never otherwise re-synced from a + * later config change on this call path -- not by re-parsing + * mc->cluster_config directly. So activation must settle BEFORE + * persist_checkpoint_marker_triggered() runs, or the checkpoint + * this marker forces still captures whatever runtime state existed + * prior to activation, regardless of how soon afterward activation + * runs. (This ordering constraint is logically necessary given + * write_snapshot's own read path, confirmed by reading + * collect_queue_frames/write_snapshot directly -- not yet + * separately confirmed against a live soak re-run at the time this + * comment was written; see the task's own final live-soak + * verification step for that.) + * + * Symmetric with task 6.2's own fix shape below: one unconditional + * call at the single apply seam every member's marker-apply is + * guaranteed to pass through, rather than patching only the + * originating code path. + * + * Safe to call here for the same reason task 6.2's own call + * (upgrade_materialization_verify, below) is safe at this exact + * seam: neither config_activate_committed nor anything it + * transitively calls (config_committed_marker, local_config_sha256, + * conf_read_current_filename, conf_read_raw, load_primary_config) + * acquires apply_pump_lock, p->apply_pump_lock, or any other lock + * (verified -- config_repl.c's only two mutexes, c->ha.lock and + * c->persist.lock, are both taken in unrelated functions never on + * this call path) -- so no reentrant-lock hazard even though this + * runs while persist_apply_pump_run holds apply_pump_lock across + * its entire dispatch. The disk I/O this performs (WAL segment + * scan, config file read, Cap'n Proto decode) is the same class + * already unconditionally performed at this exact call site by + * upgrade_materialization_verify below (config_committed_marker's + * own scan + a config-bytes read/hash), so this adds no new + * blocking-I/O hazard class. Return value intentionally ignored + * (mirrors upgrade_materialization_verify below): a + * mismatch/absence return (-EAGAIN/-ENOENT) means this member's own + * serve-fence (config_serve_fenced, a SEPARATE mechanism from the + * Activation Fence below) is set instead, and that fence already + * has its own established retry path (config_schedule_activate_retry) + * driven off commit-advance -- this call's only job here is to give + * every marker-apply one unconditional attempt so a member never + * depends solely on a later, independent event to activate. + * + * Guarded on c->myconf != NULL: in production myconf is always + * wired during cluster init, well before any commit/apply can run, + * so this is a no-op check on every real code path -- but + * config_activate_committed's own -ENOENT fallback calls + * load_primary_config(c) unconditionally on c->myconf without its + * own null check (pre-existing in config_repl.c, out of this fix's + * scope to touch), and this call site is reachable from a + * bare/otherwise-empty test cluster_t that exercises + * WAL_CONFIG_MARKER apply mechanics without wiring myconf + * (test_upgrade_snapshot_apply.c's tusa_t fixture, + * test_marker_apply_via_live_pump_checkpoints_at_marker_own_lsn -- + * confirmed via a live SEGV in load_primary_config, address 0x28, + * before this guard was added) -- mirrors this same file's existing + * tolerance of a bare fixture elsewhere (e.g. collect_queue_frames' + * `c->qmgr == NULL` check, read_active_config_bytes' "no live + * cluster back-pointer" handling) rather than crashing a test that + * predates and is unrelated to config activation. */ + if (c->myconf != NULL) + (void)config_activate_committed(c); + + int rc; +#ifdef XCE_TESTING + if (persist_marker_checkpoint_fault_hook != NULL && + persist_marker_checkpoint_fault_hook(p, lsn)) { + /* Simulated crash (task 8.1, Req 6.3): skip the checkpoint call + * entirely and fall into the SAME genuine-failure handling below + * a real checkpoint I/O error already takes -- see the fault + * hook's own doc comment above for why that is the correct, + * not merely convenient, simulation of "the process never got + * to checkpoint". */ + rc = -ECANCELED; + } else +#endif + rc = persist_checkpoint_marker_triggered(p, lsn); + if (rc == -EBUSY) { + /* Expected, self-resolving (Req 4.4/5.3): a concurrent + * WAL-threshold-triggered or earlier marker-triggered + * checkpoint already holds the shared single-in-flight guard + * (checkpoint_in_progress). That in-flight checkpoint + * completes on its own; this marker's own configuration is + * still picked up by it or a later checkpoint (every + * checkpoint embeds the currently active configuration, task + * 2.3) -- not an error, no retry loop here. */ + TRACE("apply_committed_entry: WAL_CONFIG_MARKER lsn=%" PRIu64 + " checkpoint already in progress -- skipping, " + "self-resolving", lsn); + } else if (rc != 0) { + /* A genuine checkpoint failure (I/O error, etc.) -- propagate + * so the caller's existing halt-and-retry-from-same-position + * handling engages (persist_apply_pump_run / replay_wal), + * exactly mirroring every other negative-return case in this + * dispatch. last_applied_lsn is NOT advanced past this marker, + * so the next kick/retry re-attempts the checkpoint fresh + * (Req 5.2 crash-safety: resume materialization from the + * marker). upgrade_materialization_verify below still runs + * even on this path (it reads its own signals -- the + * committed marker + c->persist.cfgref_* -- independently of + * this rc; a failed checkpoint attempt here does not by + * itself change whether a PRIOR checkpoint already + * materialized under the current marker). */ + ERROR("apply_committed_entry: WAL_CONFIG_MARKER lsn=%" PRIu64 + " forced checkpoint failed (rc=%d)", lsn, rc); + } + + /* config-upgrade-snapshot task 6.2 (Req 1.8, 3.2, 3.4, 5.5): + * unconditional Activation Fence re-evaluation right after every + * checkpoint attempt tied to this marker, regardless of whether + * persist_checkpoint_marker_triggered just above returned 0, + * -EBUSY, or a genuine error -- upgrade_materialization_verify + * itself already handles "materialization not done yet" correctly + * (it fences and returns -EAGAIN rather than erroring), so gating + * this call on rc would only reintroduce the closed loop this call + * site exists to break (every OTHER caller of + * upgrade_materialization_verify is itself gated on the fence + * already being set -- see upgrade_materialization_retry_fn and + * its callers in ha.c -- so without one unconditional trigger the + * fence could never transition from its zero-initialized default). + * Checkpoint completion is the design-intended trigger for this + * re-evaluation (design.md's Activation Fence component). Safe to + * call here: neither upgrade_materialization_verify nor anything + * it calls (config_committed_marker, conf_read_current_filename, + * conf_read_raw) acquires apply_pump_lock or p->apply_pump_lock -- + * they only do atomic reads of c->persist.committed_lsn / + * c->persist.cfgref_* and plain file I/O (opendir/pread-style WAL + * scan, conf_read_raw) -- so no reentrant-lock hazard even though + * this call runs while persist_apply_pump_run holds + * apply_pump_lock across this entire dispatch (same hazard class + * as task 5's own persist_checkpoint_marker_triggered, avoided the + * same way: never touch apply_pump_lock). Return value + * intentionally ignored here -- ha_dispatch_gate and the + * promotion gate (ha.c) are what actually consume the fence; + * this call's only job is to keep it current. */ + (void)upgrade_materialization_verify(c); + + return (rc == -EBUSY) ? 0 : rc; + } + default: - /* WAL_NOOP / WAL_CONFIG_MARKER / WAL_CHECKPOINT / unknown — no - * entity effect at this seam, no hook (unchanged from - * apply_wal_entry's existing treatment of these types). */ + /* WAL_NOOP / WAL_CHECKPOINT / unknown — no entity effect at this + * seam, no hook (unchanged from apply_wal_entry's existing + * treatment of these types). WAL_CONFIG_MARKER has its own explicit + * case above (config-upgrade-snapshot task 5) and no longer falls + * through to here. */ return 0; } } diff --git a/src/controller/repl.c b/src/controller/repl.c index c7e8dd6..16c8c5f 100644 --- a/src/controller/repl.c +++ b/src/controller/repl.c @@ -93,15 +93,60 @@ int repl_add_standby(replicator_t *r, repl_ep_t ep, const char *host, uint32_t p return -ENOSPC; } - /* Find first empty slot */ + /* Slot allocation (bug-1474 hardening): prefer a genuinely virgin slot + * over one still holding an unexpired bug-1147 disconnect guard + * (last_disconnected_lsn != 0) for a DIFFERENT peer. repl_add_standby + * cannot know whether this call is a legitimate new connection or a + * duplicate/late-joiner reconnect for an already-connected peer (that + * classification defect lives in ha.c, out of scope here) — but either + * way, clobbering an unexpired guard is never correct: it silently + * defeats repl_trim_lsn's WAL retention floor for whichever standby + * the guard was protecting (see .wolf/buglog.json bug-1474). + * + * Pass 1: any slot with ep==NULL && last_disconnected_lsn==0 (virgin — + * never used, or its guard already expired via + * repl_expire_disconnect_slots, which fully zeroes the slot). Always + * safe to take; first such slot by index. + * + * Pass 2 (fallback, only when Pass 1 finds nothing): among slots with + * ep==NULL && last_disconnected_lsn!=0 (guard-holding), reuse the one + * with the OLDEST last_disconnect_time. Deliberate policy: that guard + * is closest to its own natural expiry (repl_expire_disconnect_slots' + * snap_interval_s window), so reusing it discards the LEAST remaining + * WAL-retention protection of any guard-holding slot. With + * MAX_STANDBYS==3 it is possible — under a chaotic multi-disconnect + * scenario with no virgin slot free — for every non-primary slot to be + * guard-holding simultaneously; refusing this connect (-ENOSPC) would + * trade a bounded, already-degraded WAL-retention risk for an outright + * connection failure, which is worse for cluster availability. This + * fallback does NOT touch the -ENOSPC path above, which remains + * reserved for the genuinely-impossible case of more distinct live + * peers than slots exist. */ int idx = -1; for (int i = 0; i < MAX_STANDBYS; i++) { - if (r->standbys[i].ep == NULL) { + if (r->standbys[i].ep == NULL && r->standbys[i].last_disconnected_lsn == 0) { idx = i; break; } } + /* Pass 1 found nothing -- about to fall back to Pass 2 (guard-holding + * slot reuse) below. Tracked so the WARN below fires only for the + * genuine fallback case, not the common virgin-slot path. */ + int used_fallback_slot = (idx < 0); + + if (idx < 0) { + for (int i = 0; i < MAX_STANDBYS; i++) { + if (r->standbys[i].ep != NULL) { + continue; + } + if (idx < 0 || + r->standbys[i].last_disconnect_time < r->standbys[idx].last_disconnect_time) { + idx = i; + } + } + } + if (idx < 0) { /* Should not happen given nstandbys guard above, but be safe */ mylock_unlock(&r->lock); @@ -109,6 +154,17 @@ int repl_add_standby(replicator_t *r, repl_ep_t ep, const char *host, uint32_t p } standby_conn_t *s = &r->standbys[idx]; + if (used_fallback_slot) { + /* bug-1474 review finding: this silently destroys the slot's + * WAL-retention guard below (via memset) -- log it loudly, mirroring + * repl_broadcast's existing "degraded but continuing" WARN + * convention (e.g. "standby %s:%u evicted", line ~314 above), so the + * discarded protection is operator-visible instead of silent. */ + WARN("repl_add_standby: reusing guard-holding slot %d (host=%s:%u," + " last_disconnected_lsn=%lu) -- no virgin slot available," + " WAL-retention protection discarded", + idx, s->host, s->port, (unsigned long)s->last_disconnected_lsn); + } memset(s, 0, sizeof(*s)); s->ep = ep; s->port = port; @@ -719,6 +775,12 @@ void repl_complete_catchup(replicator_t *r, repl_ep_t ep) if (r->standbys[i].ep == ep) { atomic_store_explicit(&r->standbys[i].in_catch_up, 0, memory_order_release); + /* bug-1479: reset the eviction counter on re-entry to live + * broadcast -- otherwise a stale pending_ack_count carried over + * from before catch-up could immediately re-trip + * repl_broadcast's MAX_PENDING_ACKS eviction on the very next + * send, undoing the catch-up this function just completed. */ + r->standbys[i].pending_ack_count = 0; changed = 1; break; } @@ -738,6 +800,28 @@ void repl_complete_catchup(replicator_t *r, repl_ep_t ep) pthread_mutex_unlock(&r->ack_lock); } +int repl_get_catchup_join_lsn(replicator_t *r, repl_ep_t ep, + uint64_t *join_applied_lsn_out) +{ + if (r == NULL || join_applied_lsn_out == NULL) + return 0; + + int found = 0; + mylock_lock(&r->lock); + for (int i = 0; i < MAX_STANDBYS; i++) { + if (r->standbys[i].ep == ep) { + if (atomic_load_explicit(&r->standbys[i].in_catch_up, + memory_order_acquire)) { + *join_applied_lsn_out = r->standbys[i].join_applied_lsn; + found = 1; + } + break; + } + } + mylock_unlock(&r->lock); + return found; +} + int repl_needs_snapshot(replicator_t *r, uint64_t standby_lsn, uint64_t oldest_wal_lsn) { diff --git a/src/controller/testsuite/configcompare.c b/src/controller/testsuite/configcompare.c new file mode 100644 index 0000000..dec172d --- /dev/null +++ b/src/controller/testsuite/configcompare.c @@ -0,0 +1,219 @@ +#define _GNU_SOURCE +#include "configcompare.h" + +#include +#include +#include +#include +#include +#include + +/* Bound on a member's config bytes this tool will read -- mirrors + * persist.c's PERSIST_CONFIG_BYTES_MAX_SIZE / config_repl.h's CONF_MAX_SIZE + * (1 MiB) exactly. Duplicated as its own local constant rather than + * including either header, for the same reason the resolve-then-read logic + * below is duplicated -- see read_member_config_sha256()'s doc comment. */ +#define CONFIGCOMPARE_CONFIG_MAX_SIZE (1u * 1024u * 1024u) + +/* Resolve `/conf/current` -> `/conf/`, + * read its raw bytes, and hash them into `out_sha`. + * + * DELIBERATE DUPLICATION -- this is the FOURTH independent copy of this + * exact resolve-then-read-then-hash logic in this codebase: + * 1. config_repl.c's conf_read_current_filename() + conf_read_raw() + * (the production implementation -- config replication). + * 2. config_repl.c's local_config_sha256() (activation-fence hash check; + * an inline copy for the same "no cross-file call needed here" + * reason as #4 below). + * 3. persist.c's read_active_config_bytes() (checkpoint config-bytes + * embedding; see its own doc comment for the full "why duplicate, + * not call" rationale -- avoiding a persist.c -> config_repl.c + * layering dependency). + * 4. This function. configcompare.c is compiled into the standalone + * xce_test CLI (meson.build's xce_test_src), which links ONLY + * libxce_dep / librtti_dep / struct2json_dep / readline_dep / + * history_dep / ncurses_dep / tinylog_dep / zlib_dep / + * c_capnproto_dep -- deliberately NOT config_repl.c, persist.c, + * cluster.c, or any other heavy controller object file. This is a + * lightweight, dependency-light offline CLI tool family + * (walcompare/snapdiff/snapverify all share the same constraint; no + * live RPC to any cluster member, consistent with every other tool + * in this family -- design.md "Regression Tooling"). Adding a + * config_repl.c dependency to link in one function would violate + * that boundary, so the ~25-line resolve+read is duplicated inline + * here instead, exactly as persist.c's read_active_config_bytes() + * already chose to do for the identical reason. + * + * Returns 0 with `out_sha` filled on success. Returns a negative errno on + * any failure to resolve or read: -ENOENT (no conf/current pointer, or it + * names a versioned file that is not present -- benign "not provisioned + * yet" as well as genuine absence, both surfaced identically to the + * caller as "unreadable"), -EINVAL (malformed pointer file: empty, + * embedded '/', wrong prefix, wrong hex length), -EIO (short + * read/zero-byte versioned file), -EFBIG (versioned file exceeds + * CONFIGCOMPARE_CONFIG_MAX_SIZE), or -ENOMEM. This is the caller's + * "unreadable/absent" signal -- distinct from and never conflated with a + * mismatched hash. */ +static int read_member_config_sha256(const char* conf_dir, uint8_t out_sha[32]) +{ + if (!conf_dir || !*conf_dir) + return -EINVAL; + + char head_path[4160]; + snprintf(head_path, sizeof(head_path), "%s/conf/current", conf_dir); + + FILE* hf = fopen(head_path, "r"); + if (hf == NULL) + return -ENOENT; /* no config pushed to this member yet */ + + struct stat hst; + if (fstat(fileno(hf), &hst) == 0 && hst.st_size == 0) { + fclose(hf); + return -ENOENT; /* interrupted-write pointer file -- treat as absent */ + } + + char fname[256]; + if (fgets(fname, (int)sizeof(fname), hf) == NULL) { + fclose(hf); + return -EIO; + } + fclose(hf); + fname[strcspn(fname, "\n")] = '\0'; + + if (strchr(fname, '/') != NULL) + return -EINVAL; /* corrupted pointer file -- embedded path separator */ + if (strncmp(fname, "cluster.bin.", 12) != 0) + return -EINVAL; + const char* hex = fname + 12; + if (strlen(hex) != 12 || strspn(hex, "0123456789abcdef") != 12) + return -EINVAL; + + char cfg_path[4416]; + snprintf(cfg_path, sizeof(cfg_path), "%s/conf/%s", conf_dir, fname); + + FILE* cf = fopen(cfg_path, "rb"); + if (cf == NULL) + return -ENOENT; /* pointer references a file that is not there */ + + if (fseek(cf, 0, SEEK_END) != 0) { fclose(cf); return -EIO; } + long sz = ftell(cf); + if (sz < 0) { fclose(cf); return -EIO; } + if (fseek(cf, 0, SEEK_SET) != 0) { fclose(cf); return -EIO; } + + if (sz == 0) { + fclose(cf); + return -EIO; /* zero-byte versioned config file: genuine corruption */ + } + if ((size_t)sz > CONFIGCOMPARE_CONFIG_MAX_SIZE) { + fclose(cf); + return -EFBIG; + } + + uint8_t* buf = (uint8_t*)malloc((size_t)sz); + if (buf == NULL) { + fclose(cf); + return -ENOMEM; + } + if (fread(buf, 1, (size_t)sz, cf) != (size_t)sz) { + free(buf); + fclose(cf); + return -EIO; + } + fclose(cf); + + SHA256(buf, (size_t)sz, out_sha); + free(buf); + return 0; +} + +static const char* sha256_hex(const uint8_t sha[32], char out[65]) +{ + static const char digits[] = "0123456789abcdef"; + for (int i = 0; i < 32; i++) { + out[i * 2] = digits[(sha[i] >> 4) & 0xF]; + out[i * 2 + 1] = digits[sha[i] & 0xF]; + } + out[64] = '\0'; + return out; +} + +int configcompare_paths(const char* const* conf_paths, int n, FILE* out, + configcompare_report_t* rep) +{ + configcompare_report_t local; + memset(&local, 0, sizeof(local)); + local.first_divergent_index = -1; + + if (!conf_paths || n < 2) { + if (rep) + *rep = local; + if (out) + fprintf(out, + "configcompare: nothing to compare (need >= 2 members, " + "got %d)\n", n); + return -EINVAL; + } + if (n > CONFIGCOMPARE_MAX_MEMBERS) { + if (rep) + *rep = local; + if (out) + fprintf(out, "configcompare: too many members (%d > max %d)\n", n, + CONFIGCOMPARE_MAX_MEMBERS); + return -EINVAL; + } + + local.n = n; + int first_ok = -1; + char hexbuf[65]; + + for (int i = 0; i < n; i++) { + int rc = read_member_config_sha256(conf_paths[i], local.sha256[i]); + local.read_rc[i] = rc; + + if (rc != 0) { + if (out) + fprintf(out, + "configcompare: member %d (%s): UNREADABLE: %s\n", i, + conf_paths[i] ? conf_paths[i] : "(null)", + strerror(-rc)); + if (rep) + *rep = local; + /* Short-circuit on the first unreadable member, mirroring + * snapdiff_paths's early-return-on-open-failure style: a + * member we could not read is not evidence of matching OR + * mismatching configuration, so there is no point continuing + * to accumulate a verdict that will be discarded anyway. */ + return rc; + } + + if (out) + fprintf(out, "configcompare: member %d (%s): sha256=%s\n", i, + conf_paths[i], sha256_hex(local.sha256[i], hexbuf)); + + if (first_ok < 0) { + first_ok = i; + } else if (local.first_divergent_index < 0 && + memcmp(local.sha256[i], local.sha256[first_ok], 32) != 0) { + local.first_divergent_index = i; + } + } + + local.all_present = 1; + local.all_identical = (local.first_divergent_index < 0); + + if (rep) + *rep = local; + + if (!local.all_identical) { + if (out) + fprintf(out, + "configcompare: DIVERGENT -- member %d differs from " + "member %d\n", + local.first_divergent_index, first_ok); + return 1; + } + + if (out) + fprintf(out, "configcompare: IDENTICAL across %d members\n", n); + return 0; +} diff --git a/src/controller/testsuite/configcompare.h b/src/controller/testsuite/configcompare.h new file mode 100644 index 0000000..f478369 --- /dev/null +++ b/src/controller/testsuite/configcompare.h @@ -0,0 +1,74 @@ +#pragma once +/* + * configcompare.h — cross-member active-configuration comparator + * (config-upgrade-snapshot task 8.4, Requirement 4.2). + * + * Compares each cluster member's locally-held ACTIVE configuration content + * hash, recomputed FRESH from that member's own on-disk configuration file + * (never trusted from a cached/embedded tag), and reports whether every + * member agrees. + * + * A new sibling tool to walcompare, NOT an extension of it: walcompare's + * internal model is WAL-entry-indexed (lsn -> term, pcrc) -- an awkward fit + * for a single (tag, sha256) value per member with no LSN dimension + * (design.md "Regression Tooling"). Mirrors snapdiff_paths's exact + * signature/reporting shape instead. + * + * Offline/file-based: no live RPC to any cluster member, consistent with + * every other tool in this family (walcompare, snapdiff, snapverify). + * + * Strictly read-only: opens files O_RDONLY, mutates nothing. + */ +#include +#include + +/* Bound on the number of members a single call can compare -- generous for + * any real cluster size this codebase targets; a caller with more members + * than this is almost certainly passing a malformed argument list. */ +#define CONFIGCOMPARE_MAX_MEMBERS 32 + +typedef struct { + int n; /* member count passed in */ + int read_rc[CONFIGCOMPARE_MAX_MEMBERS]; /* 0 = resolved+hashed ok, + * else -errno; entries at + * or past a short-circuit + * failure are unset (0) + * and must be ignored -- + * see all_present */ + uint8_t sha256[CONFIGCOMPARE_MAX_MEMBERS][32]; /* valid only where + * read_rc[i] == 0 */ + int all_present; /* 1 iff every member (0..n-1) was resolved and + * hashed successfully */ + int all_identical; /* 1 iff all_present && every member's sha256 + * equals the first member's */ + int first_divergent_index; /* -1 if all_identical or !all_present; + * else the first index (after the + * reference, member 0) whose hash + * differs from member 0's */ +} configcompare_report_t; + +/* Compare the active-configuration content hash of `n` members. Each + * `conf_paths[i]` is a member's `workdir/name` directory -- the SAME + * directory persist.c's `read_active_config_bytes()` and config_repl.c's + * `local_config_sha256()` both resolve `conf/current` (and the versioned + * config file it points at) under, matching where this spec's snapshot-embed + * step also reads from. NOT the raw `conf/current` file itself -- this + * function resolves `/conf/current` and `/conf/` + * internally, exactly like those two functions do. + * + * Prints a human-readable report to `out` (may be NULL) and fills `*rep` + * (may be NULL). Returns: + * 0 if every member's config was readable and all hashes are identical + * 1 if every member's config was readable but at least one diverges + * (see `*rep->first_divergent_index` for which) + * <0 (negative errno) if `n < 2` (nothing to compare), `n` exceeds + * CONFIGCOMPARE_MAX_MEMBERS, or any member's config could not be + * resolved/read -- mirrors snapdiff_paths's early-return-on-open- + * failure style: the first unreadable member short-circuits the scan, + * and `*rep` is still filled with whatever was learned about the + * members checked before the failure, so the report can say which + * member and why. A member that could not be read is NOT evidence of + * matching OR mismatching configuration -- it is a distinct third + * outcome from "identical" and "divergent". */ +int configcompare_paths(const char* const* conf_paths, int n, FILE* out, + configcompare_report_t* rep); diff --git a/src/controller/testsuite/controller_test.c b/src/controller/testsuite/controller_test.c index 9b70984..85fed32 100644 --- a/src/controller/testsuite/controller_test.c +++ b/src/controller/testsuite/controller_test.c @@ -69,6 +69,7 @@ extern void test_waldump(void); extern void test_walcompare(void); extern void test_snapverify(void); extern void test_snapdiff(void); +extern void test_configcompare(void); extern void test_drive_async_config(void); extern void test_slowlane(void); extern void test_commit_admission_pool(void); @@ -88,6 +89,9 @@ extern void test_apply_pump_integration(void); extern void test_job_array_apply(void); extern void test_job_array_fence(void); extern void test_job_array_replay_fence(void); +extern void test_upgrade_snapshot_restore(void); +extern void test_upgrade_snapshot_apply(void); +extern void test_bug857_regression(void); void setUp(void) { return; } @@ -226,6 +230,7 @@ int main(int argc, char* argv[]) TEST(test_walcompare); TEST(test_snapverify); TEST(test_snapdiff); + TEST(test_configcompare); TEST(test_drive_async_config); TEST(test_slowlane); TEST(test_commit_admission_pool); @@ -245,6 +250,9 @@ int main(int argc, char* argv[]) TEST(test_job_array_apply); TEST(test_job_array_fence); TEST(test_job_array_replay_fence); + TEST(test_upgrade_snapshot_restore); + TEST(test_upgrade_snapshot_apply); + TEST(test_bug857_regression); return UNITY_END(); } diff --git a/src/controller/testsuite/snapverify.c b/src/controller/testsuite/snapverify.c index cd2bc2e..d801ebb 100644 --- a/src/controller/testsuite/snapverify.c +++ b/src/controller/testsuite/snapverify.c @@ -9,8 +9,12 @@ #include /* Mirrors persist.c's SNAPSHOT_FORMAT_VERSION / header layout exactly — see - * persist.c write_snapshot() (~line 1758) and load_snapshot() (~line 2325). */ -#define SNAP_FORMAT_VERSION 1u + * persist.c write_snapshot() (~line 1758) and load_snapshot() (~line 2325). + * config-upgrade-snapshot task 1 bumped persist.c's SNAPSHOT_FORMAT_VERSION + * 1->2 (host/queue admin-state frames migrated to capnp, Req 1.9/5.7) -- + * this MUST track that bump, or this tool hard-rejects every real + * checkpoint the current codebase writes (task 8.4 finding). */ +#define SNAP_FORMAT_VERSION 2u #define SNAP_HEADER_MAX (16 + 1 + 8 + 32) /* magic+lsn + optional cfgref tail */ static void fail(snapverify_report_t* rep, int rc, off_t off, const char* why) @@ -78,8 +82,17 @@ int snapverify_path(const char* path, FILE* out, snapverify_report_t* rep) } memcpy(&local.checkpoint_lsn, header + 8, 8); - if (n >= SNAP_HEADER_MAX && header[16] != 0) - local.has_cfgref = 1; + if (n >= SNAP_HEADER_MAX) { + /* Decode the tag/hash UNCONDITIONALLY whenever the header extends + * this far, regardless of the presence byte -- so a caller can + * inspect the raw bytes even in edge cases. has_cfgref keeps its + * existing meaning (whether those bytes are semantically + * meaningful) untouched. */ + memcpy(&local.cfgref_tag, header + 17, 8); + memcpy(local.cfgref_sha, header + 25, 32); + if (header[16] != 0) + local.has_cfgref = 1; + } off_t consumed = (off_t)n; @@ -200,11 +213,11 @@ int snapverify_path(const char* path, FILE* out, snapverify_report_t* rep) local.queue_count = queue_count; for (uint32_t i = 0; i < queue_count; i++) { - off_t len_off = consumed; - uint32_t name_len = 0; - if (read(fd, &name_len, sizeof(name_len)) != (ssize_t)sizeof(name_len)) { + off_t len_off = consumed; + uint32_t plen = 0; + if (read(fd, &plen, sizeof(plen)) != (ssize_t)sizeof(plen)) { close(fd); - fail(&local, -EIO, len_off, "short read on queue name_len"); + fail(&local, -EIO, len_off, "short read on queue payload_len"); if (rep) *rep = local; if (out) @@ -212,13 +225,13 @@ int snapverify_path(const char* path, FILE* out, snapverify_report_t* rep) path, i, local.fail_reason, (intmax_t)len_off); return -EIO; } - consumed += (off_t)sizeof(name_len); + consumed += (off_t)sizeof(plen); - if (name_len == 0 || (off_t)name_len > st.st_size - consumed) { + if (plen == 0 || (off_t)plen > st.st_size - consumed) { close(fd); char why[160]; snprintf(why, sizeof(why), - "bad name_len=%u (remaining=%jd)", name_len, + "bad payload_len=%u (remaining=%jd)", plen, (intmax_t)(st.st_size - consumed)); fail(&local, -EIO, len_off, why); if (rep) @@ -230,9 +243,9 @@ int snapverify_path(const char* path, FILE* out, snapverify_report_t* rep) return -EIO; } - if (lseek(fd, name_len, SEEK_CUR) < 0) { + if (lseek(fd, plen, SEEK_CUR) < 0) { close(fd); - fail(&local, -EIO, consumed, "seek past queue name failed"); + fail(&local, -EIO, consumed, "seek past queue payload failed"); if (rep) *rep = local; if (out) @@ -240,21 +253,138 @@ int snapverify_path(const char* path, FILE* out, snapverify_report_t* rep) local.fail_reason); return -EIO; } - consumed += (off_t)name_len; + consumed += (off_t)plen; + local.queues_ok++; + } - uint32_t status = 0; - if (read(fd, &status, sizeof(status)) != (ssize_t)sizeof(status)) { + /* Host section (config-upgrade-snapshot task 4/8.4, SNAPSHOT_FORMAT_ + * VERSION=2): new after the queue section (design.md "Checkpoint File + * Layout", persist.c load_snapshot_entities()/write_snapshot()). Same + * [payload_len][bytes] per-frame structural shape as the job/queue + * loops above -- this tool validates structure only, never decodes the + * capnp payload. */ + uint32_t host_count = 0; + if (read(fd, &host_count, sizeof(host_count)) != + (ssize_t)sizeof(host_count)) { + close(fd); + fail(&local, -EIO, consumed, "short read on host_count"); + if (rep) + *rep = local; + if (out) + fprintf(out, "snapverify: %s: %s (offset %jd)\n", path, + local.fail_reason, (intmax_t)consumed); + return -EIO; + } + consumed += (off_t)sizeof(host_count); + local.host_count = host_count; + + for (uint32_t i = 0; i < host_count; i++) { + off_t len_off = consumed; + uint32_t plen = 0; + if (read(fd, &plen, sizeof(plen)) != (ssize_t)sizeof(plen)) { close(fd); - fail(&local, -EIO, consumed, "short read on queue status"); + fail(&local, -EIO, len_off, "short read on host payload_len"); if (rep) *rep = local; if (out) - fprintf(out, "snapverify: %s: queue %u: %s (offset %jd)\n", - path, i, local.fail_reason, (intmax_t)consumed); + fprintf(out, "snapverify: %s: host %u: %s (offset %jd)\n", + path, i, local.fail_reason, (intmax_t)len_off); return -EIO; } - consumed += (off_t)sizeof(status); - local.queues_ok++; + consumed += (off_t)sizeof(plen); + + if (plen == 0 || (off_t)plen > st.st_size - consumed) { + close(fd); + char why[160]; + snprintf(why, sizeof(why), + "bad payload_len=%u (remaining=%jd)", plen, + (intmax_t)(st.st_size - consumed)); + fail(&local, -EIO, len_off, why); + if (rep) + *rep = local; + if (out) + fprintf(out, "snapverify: %s: host %u: %s (length field at " + "offset %jd)\n", + path, i, local.fail_reason, (intmax_t)len_off); + return -EIO; + } + + if (lseek(fd, plen, SEEK_CUR) < 0) { + close(fd); + fail(&local, -EIO, consumed, "seek past host payload failed"); + if (rep) + *rep = local; + if (out) + fprintf(out, "snapverify: %s: host %u: %s\n", path, i, + local.fail_reason); + return -EIO; + } + consumed += (off_t)plen; + local.hosts_ok++; + } + + /* Config-bytes section (config-upgrade-snapshot task 2.3/8.4): a + * single flat length-prefixed blob appended LAST, after the host + * section -- NOT a [count][frame...] shape like job/queue/host above, + * since there is exactly one active configuration, never a set + * (persist.c write_snapshot()). The length field itself may be + * legitimately ABSENT (a file that ends right after the host section + * is still a valid, if slightly older, fmt=2-consistent shape) -- + * distinguish that from the length field being present-but-zero + * (persist.c explicitly writes an empty-but-present section when no + * local config bytes exist yet) and from a genuinely truncated length + * field (a short, non-zero partial read -- real corruption). */ + uint32_t cfg_bytes_len = 0; + ssize_t cfg_len_n = read(fd, &cfg_bytes_len, sizeof(cfg_bytes_len)); + if (cfg_len_n == 0) { + /* Clean EOF right after the host section -- no config-bytes + * section present at all. Not a defect. */ + local.has_config_bytes_section = 0; + } else if (cfg_len_n != (ssize_t)sizeof(cfg_bytes_len)) { + close(fd); + fail(&local, -EIO, consumed, "short read on config_bytes_len"); + if (rep) + *rep = local; + if (out) + fprintf(out, "snapverify: %s: %s (offset %jd)\n", path, + local.fail_reason, (intmax_t)consumed); + return -EIO; + } else { + off_t len_off = consumed; + consumed += (off_t)sizeof(cfg_bytes_len); + local.has_config_bytes_section = 1; + local.config_bytes_len = cfg_bytes_len; + + if ((off_t)cfg_bytes_len > st.st_size - consumed) { + close(fd); + char why[160]; + snprintf(why, sizeof(why), + "bad config_bytes_len=%u (remaining=%jd)", cfg_bytes_len, + (intmax_t)(st.st_size - consumed)); + fail(&local, -EIO, len_off, why); + if (rep) + *rep = local; + if (out) + fprintf(out, "snapverify: %s: %s (length field at offset " + "%jd)\n", + path, local.fail_reason, (intmax_t)len_off); + return -EIO; + } + + if (cfg_bytes_len > 0) { + if (lseek(fd, cfg_bytes_len, SEEK_CUR) < 0) { + close(fd); + fail(&local, -EIO, consumed, + "seek past config bytes failed"); + if (rep) + *rep = local; + if (out) + fprintf(out, "snapverify: %s: %s\n", path, + local.fail_reason); + return -EIO; + } + consumed += (off_t)cfg_bytes_len; + } } close(fd); @@ -277,8 +407,11 @@ int snapverify_path(const char* path, FILE* out, snapverify_report_t* rep) if (out) fprintf(out, "snapverify: %s: OK (lsn=%" PRIu64 " fmt=%u jobs=%u queues=%u " - "size=%jd)\n", + "hosts=%u cfgref_tag=%016" PRIx64 " cfg_bytes_len=%u " + "has_cfg_bytes=%d size=%jd)\n", path, local.checkpoint_lsn, local.format_version, - local.job_count, local.queue_count, (intmax_t)local.file_size); + local.job_count, local.queue_count, local.host_count, + local.cfgref_tag, local.config_bytes_len, + local.has_config_bytes_section, (intmax_t)local.file_size); return 0; } diff --git a/src/controller/testsuite/snapverify.h b/src/controller/testsuite/snapverify.h index 3855e34..ca00eee 100644 --- a/src/controller/testsuite/snapverify.h +++ b/src/controller/testsuite/snapverify.h @@ -1,14 +1,20 @@ #pragma once /* * snapverify.h — read-only checkpoint-file structural inspector/validator - * (bug-1389 triage: OPCode_snapshotTransfer chunk-content corruption). + * (bug-1389 triage: OPCode_snapshotTransfer chunk-content corruption; + * extended by config-upgrade-snapshot task 8.4, Requirement 4.2, for the + * SNAPSHOT_FORMAT_VERSION=2 host + config-bytes sections and to decode -- + * not merely report the presence of -- the header's cfgref tag/hash). * * Parses the on-disk checkpoint layout persist.c's load_snapshot() / * load_snapshot_entities() use (design.md "Checkpoint File Layout") WITHOUT - * restoring any job/queue into a live cluster_t — a pure structural walk, so - * it needs no jobmgr/qmgr context and is safe to run standalone against a - * snap-*.capnp (locally generated) or snap-*.bin (received via - * ha_handle_snapshot_chunk, ha.c) file on disk. + * restoring any job/queue/host into a live cluster_t — a pure structural + * walk, so it needs no jobmgr/qmgr/workermgr context and is safe to run + * standalone against a snap-*.capnp (locally generated) or snap-*.bin + * (received via ha_handle_snapshot_chunk, ha.c) file on disk. This tool + * validates STRUCTURE only, never content: job/queue/host frame payloads + * and the config-bytes section are walked past via their length prefix, + * never capnp-decoded or interpreted. * * Strictly read-only: opens O_RDONLY, mutates nothing. */ @@ -18,7 +24,17 @@ typedef struct { uint64_t checkpoint_lsn; - int has_cfgref; /* config-ref tail present in the header */ + int has_cfgref; /* config-ref tail present in the header + * (header[16] != 0) -- semantic presence, + * distinct from cfgref_tag/cfgref_sha below + * being decoded */ + uint64_t cfgref_tag; /* header cfgref tag, decoded whenever the + * header extends to SNAP_HEADER_MAX bytes, + * REGARDLESS of has_cfgref -- meaningful + * only when has_cfgref is also 1 */ + uint8_t cfgref_sha[32]; /* header cfgref sha256, same decode- + * unconditionally-but-gate-meaning-on- + * has_cfgref discipline as cfgref_tag */ int has_entity_section; /* fmt + job_count present past the header; * 0 = legacy position-only checkpoint */ uint32_t format_version; @@ -27,6 +43,22 @@ typedef struct { uint32_t queue_count; /* as declared in the file (0 if legacy, or if the * job-frame walk failed before reaching it) */ uint32_t queues_ok; /* queue frames structurally walked before any failure */ + uint32_t host_count; /* as declared in the file (0 if legacy, or if an + * earlier section's walk failed before reaching + * it) */ + uint32_t hosts_ok; /* host frames structurally walked before any failure */ + int has_config_bytes_section; /* 1 iff the trailing config-bytes + * section's 4-byte length field + * itself was present and readable + * (i.e. the file extends past the + * host section at all) -- TRUE even + * when that length decodes to 0, and + * FALSE (not a failure) when the + * file simply ends right after the + * host section */ + uint32_t config_bytes_len; /* decoded length of the config-bytes + * section; valid only when + * has_config_bytes_section is 1 */ off_t file_size; off_t consumed; /* bytes structurally accounted for */ int ok; /* 1 = well-formed, consumed == file_size */ diff --git a/src/controller/testsuite/test.c b/src/controller/testsuite/test.c index 1a329fc..013fe1e 100644 --- a/src/controller/testsuite/test.c +++ b/src/controller/testsuite/test.c @@ -15,6 +15,7 @@ #include #include +#include /* SHA256() — cmd_upgradeconfig hashes the config blob */ #include "client.h" #include "config.h" /* XCE_MAXNAME_LEN */ @@ -27,6 +28,7 @@ #include "waldump.h" /* offline WAL inspector (cmd_waldump) */ #include "snapdiff.h" /* byte-level checkpoint-file comparator (cmd_snapdiff) */ #include "snapverify.h" /* offline checkpoint-file structural validator (cmd_snapverify) */ +#include "configcompare.h" /* cross-member active-config comparator (cmd_configcompare) */ #include "xce/cluster.h" /* xce_parse_peers, xce_cluster_config_t */ #include "xce/types.h" @@ -121,6 +123,8 @@ extern int cmd_resval(int, char*[]); extern int cmd_jobkill(int, char*[]); extern int cmd_jobckpt(int, char*[]); extern int cmd_qctrl(int, char*[]); +extern int cmd_hostctrl(int, char*[]); +extern int cmd_upgradeconfig(int, char*[]); extern int cmd_runtasks(int, char*[]); extern int cmd_setpend(int, char*[]); extern int cmd_jobinfo(int, char*[]); @@ -133,6 +137,7 @@ extern int cmd_waldump(int, char*[]); extern int cmd_walcompare(int, char*[]); extern int cmd_snapverify(int, char*[]); extern int cmd_snapdiff(int, char*[]); +extern int cmd_configcompare(int, char*[]); static int worker_house_keeping(void*); /* Session verdict / loop state (xce-test-e2e-primitives task 1.1). @@ -194,6 +199,7 @@ static command_t top_commands[] = { { "walcompare", cmd_walcompare, "Diff member committed WAL prefixes" }, { "snapverify", cmd_snapverify, "Verify checkpoint file structure" }, { "snapdiff", cmd_snapdiff, "Byte-diff two checkpoint files" }, + { "configcompare", cmd_configcompare, "Compare active config hash across members" }, { "quit", cmd_quit, "Quit xce test" }, { (char*)NULL, (cmd_func_t)NULL, (char*)NULL } }; @@ -227,6 +233,9 @@ static command_t client_commands[] = { { "reslist", cmd_reslist, "Display cluster resources" }, { "workerlist", cmd_workerlist, "list workers" }, { "qctrl", cmd_qctrl, "queue control" }, + { "hostctrl", cmd_hostctrl, "host control" }, + { "upgradeconfig", cmd_upgradeconfig, + "submit a config upgrade (cluster.bin file)" }, { "joblist", cmd_joblist, "list jobs" }, { "expect-jobs", cmd_expect_jobs, "assert current job count" }, { "expect-job", cmd_expect_job, "assert a JobId is present" }, @@ -237,6 +246,7 @@ static command_t client_commands[] = { { "walcompare", cmd_walcompare, "Diff member committed WAL prefixes" }, { "snapverify", cmd_snapverify, "Verify checkpoint file structure" }, { "snapdiff", cmd_snapdiff, "Byte-diff two checkpoint files" }, + { "configcompare", cmd_configcompare, "Compare active config hash across members" }, { "shutdown", cmd_shutdown, "shutdown xce controller" }, { "jobrun", cmd_jobrun, "run a job" }, { "jobsub", cmd_jobsub, "submit a job" }, @@ -856,6 +866,27 @@ int cmd_snapdiff(int argc, char* argv[]) return (rc == 0) ? 0 : -1; } +/* configcompare [more...] — cross-member + * active-configuration comparator (config-upgrade-snapshot task 8.4, Req + * 4.2). Each path is a member's `workdir/name` conf-root directory (the + * same directory persist.c's read_active_config_bytes() and config_repl.c's + * local_config_sha256() resolve `conf/current` under) — NOT a raw config + * file path. Recomputes each member's active-config sha256 fresh from its + * own on-disk bytes and reports whether all members match. Returns 0 if + * all members are present and identical, nonzero if any member is + * unreadable or divergent. */ +int cmd_configcompare(int argc, char* argv[]) +{ + if (argc < 3) { + fprintf(stderr, "usage: configcompare [more...]\n"); + return -1; + } + + configcompare_report_t rep; + int rc = configcompare_paths((const char* const*)&argv[1], argc - 1, stdout, &rep); + return (rc == 0) ? 0 : -1; +} + int cmd_up(int argc, char* argv[]) { if (active_ctx->parent != NULL) { @@ -995,7 +1026,15 @@ int cmd_reslist(int argc, char* argv[]) static char* worker_status_str(uint32_t status) { - if ((status & XCE_WORKER_UNAVAIL) != 0) { + /* Admin-set CLOSED takes priority over the dynamic UNAVAIL bit: the + * config-upgrade-snapshot soak (task 8.6) needs to assert a host's + * administratively-set status specifically, and a host closed via + * hostctrl that later disconnects (e.g. its xce_test `worker`/`join` + * connection exits after the script ends) would otherwise print only + * "UNAVAIL", masking the admin bit this check exists to verify. */ + if ((status & XCE_WORKER_CLOSED) != 0) { + return "CLOSED"; + } else if ((status & XCE_WORKER_UNAVAIL) != 0) { return "UNAVAIL"; } else if ((status & XCE_WORKER_LOCKEDU) != 0) { return "LOCKU"; @@ -2199,6 +2238,139 @@ int cmd_qctrl(int argc, char* argv[]) return 0; } +/* hostctrl -o|-c -h — administratively open/close a host + * (xce_hostctrl_t{action, hostname} via xcecli_hostctrl). Mirrors cmd_qctrl's + * exact getopt shape; only -o/-c are wired (matching xce_hostctrl_req's own + * accepted action range, request.c — HOST_TAG/HOST_UNTAG exist in the enum + * but are rejected -EINVAL server-side today, so no flag is offered for them + * here). Used by the config-upgrade chaotic soak (task 8.6) to set a host's + * admin status before/around a config upgrade and assert it survives. */ +int cmd_hostctrl(int argc, char* argv[]) +{ + int opt; + int rc; + xce_hostctrl_t hostctrl; + int action = HOST_DO_NONE; + char* hostname = NULL; + + optind = 1; + + while ((opt = getopt(argc, argv, "och:")) != -1) { + switch (opt) { + case 'o': + action = HOST_OPEN; + break; + case 'c': + action = HOST_CLOSE; + break; + case 'h': + hostname = strdup(optarg); + break; + default: + break; + } + } + + if (hostname == NULL) { + fprintf(stderr, "you need to specify host name with -h\n"); + return -1; + } + + if (action == HOST_DO_NONE) { + fprintf(stderr, "you need to specify -o (open) or -c (close)\n"); + free(hostname); + return -1; + } + + hostctrl.action = action; + hostctrl.hostname = hostname; + + rc = xcecli_hostctrl(active_ctx->ctx, &hostctrl); + if (rc < 0) { + perror("xcecli_hostctrl"); + free(hostname); + return rc; + } + + printf("Operation on host %s done\n", hostname); + + free(hostname); + + return 0; +} + +/* upgradeconfig — submit a configuration upgrade + * (config-upgrade-snapshot task 8.6). Reads the given capnp-encoded + * ClusterConfig blob (the same format `xceadmin config build` produces and + * deploy-ha.sh installs as cluster.bin), computes its SHA-256 (OpenSSL + * SHA256(), matching config_repl.c's do_upgrade_config_with_bytes transit + * verification), and drives it through xcecli_upgradeconfig -> + * xce_upgradeconfig_req_raw (OP_upgradeConfig). Mirrors cmd_snapdiff's + * bounds-checked file-reading style. */ +int cmd_upgradeconfig(int argc, char* argv[]) +{ + if (argc != 2) { + fprintf(stderr, "usage: upgradeconfig \n"); + return -1; + } + + const char* path = argv[1]; + FILE* fp = fopen(path, "rb"); + if (fp == NULL) { + fprintf(stderr, "upgradeconfig: cannot open %s: %s\n", path, + strerror(errno)); + return -1; + } + + if (fseek(fp, 0, SEEK_END) != 0) { + fprintf(stderr, "upgradeconfig: fseek failed on %s: %s\n", path, + strerror(errno)); + fclose(fp); + return -1; + } + + long fsz = ftell(fp); + if (fsz <= 0) { + fprintf(stderr, "upgradeconfig: %s is empty or ftell failed\n", path); + fclose(fp); + return -1; + } + rewind(fp); + + uint8_t* bytes = (uint8_t*)malloc((size_t)fsz); + if (bytes == NULL) { + fprintf(stderr, "upgradeconfig: out of memory reading %s\n", path); + fclose(fp); + return -1; + } + + size_t nread = fread(bytes, 1, (size_t)fsz, fp); + fclose(fp); + if (nread != (size_t)fsz) { + fprintf(stderr, "upgradeconfig: short read on %s (%zu of %ld bytes)\n", + path, nread, fsz); + free(bytes); + return -1; + } + + uint8_t sha256[SHA256_DIGEST_LENGTH]; + SHA256(bytes, (size_t)fsz, sha256); + + int rc = xcecli_upgradeconfig(active_ctx->ctx, sha256, + sizeof(sha256), bytes, (size_t)fsz); + free(bytes); + + if (rc < 0) { + fprintf(stderr, "upgradeconfig: failed (rc=%d): %s\n", rc, + strerror(-rc)); + return rc; + } + + printf("Config upgrade submitted from %s (%ld bytes)\n", path, fsz); + + return 0; +} + int cmd_runtasks(int argc, char* argv[]) { xce_taskhost_t hosts[MAX_TASK_HOSTS]; diff --git a/src/controller/testsuite/test_apply_committed_entry.c b/src/controller/testsuite/test_apply_committed_entry.c index ce88720..853be5f 100644 --- a/src/controller/testsuite/test_apply_committed_entry.c +++ b/src/controller/testsuite/test_apply_committed_entry.c @@ -496,6 +496,202 @@ static void test_ace_worker_ctrl_join_restores_and_notifies(void) printf("test_ace_worker_ctrl_join_restores_and_notifies: PASS\n"); } +/* Builds a [uint32 detail][capnp Worker] WAL_WORKER_CTRL payload for a + * worker named `name` carrying `status`. Mirrors the JOIN test's inline + * construction above, factored out so the UPDATE-case tests below (bug-1472) + * can build a payload against an arbitrary pre-existing worker name/status. + * Caller frees *pkt_out. */ +static void tace_build_worker_ctrl_pkt(const char* name, uint32_t status, + uint32_t detail, uint8_t** pkt_out, + size_t* total_out) +{ + hostattrs_t attrs; + memset(&attrs, 0, sizeof(attrs)); + attrs.hosttype = (char*)"unknown"; + attrs.hostmodel = (char*)"unknown"; + + xce_worker_t wdef; + memset(&wdef, 0, sizeof(wdef)); + wdef.name = (char*)name; + wdef.attrs = &attrs; + wdef.status = status; + + uint8_t* wbuf = NULL; + size_t wsize = 0; + TEST_ASSERT_EQUAL_INT(0, tace_encode_worker(&wdef, &wbuf, &wsize)); + + size_t total = sizeof(detail) + wsize; + uint8_t* pkt = malloc(total); + TEST_ASSERT_NOT_NULL(pkt); + memcpy(pkt, &detail, sizeof(detail)); + memcpy(pkt + sizeof(detail), wbuf, wsize); + free(wbuf); + + *pkt_out = pkt; + *total_out = total; +} + +/* bug-1472: worker_ctrl() (HOST_OPEN/HOST_CLOSE, worker.c:732-794) mutates + * only the admin-mutable status bits on the member that received the RPC, + * then fires the SAME WAL_WORKER_CTRL/HOOK_DETAIL_WORKER_UPDATE apply path + * on every OTHER member (standby, or this member's own WAL replay). Before + * the fix, worker_from_capnp's existing-worker guard returned -EEXIST + * unconditionally, silently discarding the decoded status change -- an + * admin hostctrl -c/-o against an already-joined host never propagated. + * This proves an UPDATE entry against an existing worker actually mutates + * it and fires the notification, matching worker_ctrl's own encode (which + * always carries the worker's post-mutation w->host.status). */ +static void test_ace_worker_ctrl_update_applies_to_existing_worker(void) +{ + tace_setup(); + + /* Pre-existing worker (e.g. from an earlier JOIN), currently open. */ + hostattrs_t attrs; + memset(&attrs, 0, sizeof(attrs)); + attrs.hosttype = (char*)"unknown"; + attrs.hostmodel = (char*)"unknown"; + xce_worker_t wdef; + memset(&wdef, 0, sizeof(wdef)); + wdef.name = (char*)"w-update"; + wdef.attrs = &attrs; + wdef.status = 0; + TEST_ASSERT_NOT_NULL(makeWorker(g_tace_c.workermgr, &wdef)); + + uint8_t* pkt = NULL; + size_t total = 0; + tace_build_worker_ctrl_pkt("w-update", + XCE_WORKER_CLOSED | XCE_WORKER_CLOSED_BY_ADMIN, + (uint32_t)HOOK_DETAIL_WORKER_UPDATE, &pkt, + &total); + + xce_add_hook(&g_tace_c.hooksys, XCE_CONTROLLER_HOOK_WORKER, tace_spy_hook, + NULL); + + int rc = apply_committed_entry(&g_tace_p, WAL_WORKER_CTRL, 41, pkt, + (uint32_t)total); + TEST_ASSERT_EQUAL_INT_MESSAGE(0, rc, + "an UPDATE against an already-existing worker must succeed (0), not " + "-EEXIST -- bug-1472: -EEXIST silently discarded the status change"); + + worker_t* w = NULL; + lock(g_tace_c.workermgr, RTTI_LOCK_READ); + key_find(g_tace_c.workermgr, (void*)"w-update", (void**)&w); + unlock(g_tace_c.workermgr); + TEST_ASSERT_NOT_NULL(w); + TEST_ASSERT_TRUE_MESSAGE( + (w->host.status & (XCE_WORKER_CLOSED | XCE_WORKER_CLOSED_BY_ADMIN)) + == (XCE_WORKER_CLOSED | XCE_WORKER_CLOSED_BY_ADMIN), + "the existing worker's admin status must be replaced with the " + "decoded UPDATE payload's, not silently discarded"); + TEST_ASSERT_EQUAL_INT_MESSAGE(1, g_tace_hook_fires, + "a genuinely-applied UPDATE must fire exactly one notification"); + + free(pkt); + tace_teardown(); + printf("test_ace_worker_ctrl_update_applies_to_existing_worker: PASS\n"); +} + +/* worker_ctrl's HOST_OPEN clears the closed bits via assignment-style + * &= ~(...) (worker.c:773), not a pure OR -- so the fix must REPLACE the + * existing worker's admin-masked bits with the decoded payload's, not OR + * them in (an OR-based fix would leave a re-opened worker stuck closed + * forever). This guards that exact semantics: apply an UPDATE encoding + * status=0 (no admin bits, i.e. a HOST_OPEN) against a worker that starts + * admin-closed and confirms the closed bits are actually cleared. */ +static void test_ace_worker_ctrl_update_replaces_not_ors_admin_bits(void) +{ + tace_setup(); + + hostattrs_t attrs; + memset(&attrs, 0, sizeof(attrs)); + attrs.hosttype = (char*)"unknown"; + attrs.hostmodel = (char*)"unknown"; + xce_worker_t wdef; + memset(&wdef, 0, sizeof(wdef)); + wdef.name = (char*)"w-reopen"; + wdef.attrs = &attrs; + wdef.status = XCE_WORKER_CLOSED | XCE_WORKER_CLOSED_BY_ADMIN; + TEST_ASSERT_NOT_NULL(makeWorker(g_tace_c.workermgr, &wdef)); + + uint8_t* pkt = NULL; + size_t total = 0; + tace_build_worker_ctrl_pkt("w-reopen", 0, + (uint32_t)HOOK_DETAIL_WORKER_UPDATE, &pkt, + &total); + + int rc = apply_committed_entry(&g_tace_p, WAL_WORKER_CTRL, 42, pkt, + (uint32_t)total); + TEST_ASSERT_EQUAL_INT(0, rc); + + worker_t* w = NULL; + lock(g_tace_c.workermgr, RTTI_LOCK_READ); + key_find(g_tace_c.workermgr, (void*)"w-reopen", (void**)&w); + unlock(g_tace_c.workermgr); + TEST_ASSERT_NOT_NULL(w); + TEST_ASSERT_EQUAL_INT_MESSAGE(0, + w->host.status & (XCE_WORKER_CLOSED | XCE_WORKER_CLOSED_BY_ADMIN), + "a HOST_OPEN UPDATE must CLEAR the closed bits (replace semantics) " + "-- an OR-based fix would incorrectly leave the worker closed"); + + free(pkt); + tace_teardown(); + printf("test_ace_worker_ctrl_update_replaces_not_ors_admin_bits: PASS\n"); +} + +/* Regression guard (bug-1472 fix must NOT change JOIN's behavior): a + * duplicate JOIN replay against an already-registered worker (e.g. WAL + * replay / resync redelivery) must remain a genuine no-op -- -EEXIST + * translated to 0 by apply_committed_entry, no status mutation, no + * notification. */ +static void test_ace_worker_ctrl_join_duplicate_existing_is_noop(void) +{ + tace_setup(); + + hostattrs_t attrs; + memset(&attrs, 0, sizeof(attrs)); + attrs.hosttype = (char*)"unknown"; + attrs.hostmodel = (char*)"unknown"; + xce_worker_t wdef; + memset(&wdef, 0, sizeof(wdef)); + wdef.name = (char*)"w-dupjoin"; + wdef.attrs = &attrs; + wdef.status = 0; + TEST_ASSERT_NOT_NULL(makeWorker(g_tace_c.workermgr, &wdef)); + + uint8_t* pkt = NULL; + size_t total = 0; + tace_build_worker_ctrl_pkt("w-dupjoin", + XCE_WORKER_CLOSED | XCE_WORKER_CLOSED_BY_ADMIN, + (uint32_t)HOOK_DETAIL_WORKER_JOIN, &pkt, + &total); + + xce_add_hook(&g_tace_c.hooksys, XCE_CONTROLLER_HOOK_WORKER, tace_spy_hook, + NULL); + + int rc = apply_committed_entry(&g_tace_p, WAL_WORKER_CTRL, 43, pkt, + (uint32_t)total); + TEST_ASSERT_EQUAL_INT_MESSAGE(0, rc, + "apply_committed_entry translates worker_from_capnp's -EEXIST to 0 " + "(idempotent no-op)"); + + worker_t* w = NULL; + lock(g_tace_c.workermgr, RTTI_LOCK_READ); + key_find(g_tace_c.workermgr, (void*)"w-dupjoin", (void**)&w); + unlock(g_tace_c.workermgr); + TEST_ASSERT_NOT_NULL(w); + TEST_ASSERT_EQUAL_INT_MESSAGE(0, + w->host.status & (XCE_WORKER_CLOSED | XCE_WORKER_CLOSED_BY_ADMIN), + "a duplicate JOIN replay must NOT mutate the existing worker's " + "status -- this pre-existing JOIN behavior is intentionally " + "unchanged by the bug-1472 UPDATE fix"); + TEST_ASSERT_EQUAL_INT_MESSAGE(0, g_tace_hook_fires, + "a duplicate JOIN no-op must not fire a notification"); + + free(pkt); + tace_teardown(); + printf("test_ace_worker_ctrl_join_duplicate_existing_is_noop: PASS\n"); +} + /* ── WAL_JOB_ARRAY_SUBMIT (job-array-single-wal-record task 3.2) ────────── */ static job_submit_data_t tace_array_make_spec(void) @@ -748,6 +944,9 @@ void test_apply_committed_entry(void) RUN_TEST(test_ace_job_state_transition_rejects_backward_suppresses_notify); RUN_TEST(test_ace_queue_ctrl_updates_and_notifies); RUN_TEST(test_ace_worker_ctrl_join_restores_and_notifies); + RUN_TEST(test_ace_worker_ctrl_update_applies_to_existing_worker); + RUN_TEST(test_ace_worker_ctrl_update_replaces_not_ors_admin_bits); + RUN_TEST(test_ace_worker_ctrl_join_duplicate_existing_is_noop); RUN_TEST(test_ace_job_array_submit_constructs_all_and_notifies_once); RUN_TEST(test_ace_job_array_submit_idempotent_replay_no_extra_notify); #ifdef XCE_TESTING diff --git a/src/controller/testsuite/test_bug857_regression.c b/src/controller/testsuite/test_bug857_regression.c new file mode 100644 index 0000000..98299af --- /dev/null +++ b/src/controller/testsuite/test_bug857_regression.c @@ -0,0 +1,513 @@ +/* + * test_bug857_regression.c — config-upgrade-snapshot task 8.5 + * + * Reproduces the bug-857 materialized-state divergence on the PRE-fix + * mechanism and proves it converges on the CURRENT (post-task-5) one, both + * at the controller_unit_test level, entirely within this one file. + * + * ── Investigation summary (why this file looks the way it does) ──────── + * + * Task 8.5's original brief hypothesized bug-857's divergence as "a job + * whose queue was removed by a config upgrade replays into its original + * queue on one member and gets re-homed to the synthetic `lost_and_found` + * queue on another, depending on each member's own restart timing." + * Investigation (this task) found that mechanism does not exist as + * implemented code, on ANY commit: `create_lost_and_found` (config_repl.c) + * only ever creates the sentinel queue/host objects — no code path in + * job.c/queue.c/worker.c ever reassigns an EXISTING job's queue reference + * onto them. `restore_job`/`restore_job_array` (job.c) never consult + * `c->qmgr` at all; `restore_queue_state` (queue.c) explicitly SKIPS + * (returns -ENOENT) rather than re-homes when the target queue is absent. + * `create_lost_and_found`'s body is also unconditionally `#ifndef + * XCE_TESTING`'d out. bug-857's buglog entry itself already flagged this + * as "NOT empirically reproduced yet" — the re-homing detail was TLA+- + * derived aspiration, not observed behavior. + * + * design.md's Requirements Traceability table (row 6.2) originally + * assigned this requirement to "HA soak new scenario" — written under the + * same since-corrected hypothesis. The real, code-backed divergence this + * file reproduces instead is CHECKPOINT-CONTENT divergence: pre-task-5, + * `apply_committed_entry`'s WAL_CONFIG_MARKER case was a no-op (the + * generic `default:` case) and a checkpoint's LSN/content was determined + * SOLELY by `schedule_checkpoint`'s independent per-member WAL-record-count + * threshold (persist.c) — completely decoupled from the config-change + * marker's own position in the shared committed log. Two members reaching + * that threshold at different real-world moments (because other activity — + * more job submissions — is interleaved around the upgrade) materialize + * genuinely different job/queue content, with NEITHER checkpoint anchored + * to the marker at all: exactly "no snapshot pinning an identical + * post-upgrade state" (bug-857's own root-cause wording). Post-task-5, + * `apply_committed_entry`'s WAL_CONFIG_MARKER case forces + * `persist_checkpoint_marker_triggered()` synchronously, INLINE, the + * instant the marker entry itself is dispatched — before the per-LSN + * apply loop ever reaches any later entry — so every member's + * marker-anchored checkpoint captures identical content regardless of its + * own processing pace. + * + * Both scenarios below run entirely within controller_unit_test — no + * cluster.c linkage (cluster_init/cluster_build_resources), no scratch + * worktree, no live multi-process cluster needed. See this task's Status + * Report / design.md's 6.2 traceability-row correction note for the full + * decision trail. + * + * ── Scenario 1: test_bug857_threshold_checkpoint_diverges_across_members ── + * Reproduces the PRE-task-5 mechanism for real: two members receive the + * identical physical WAL (job1, config-change marker, job2), but their + * entity state and checkpoint are driven manually via restore_job() + + * persist_checkpoint() — the SAME production functions + * apply_committed_entry()/schedule_checkpoint() would themselves call — + * WITHOUT ever routing the marker's LSN through apply_committed_entry() + * itself (which, on the CURRENT codebase, unconditionally forces the + * marker-anchored checkpoint task 5 added, masking exactly the bug this + * scenario needs to demonstrate the absence of). Member A's threshold + * trips right after job1 (before job2 exists locally); member B's does not + * trip until after job2 exists locally too — modeling two members whose + * own independent checkpoint/restart timing straddles ordinary cluster + * activity happening around the upgrade. Asserts the two members' checkpoint + * files are NOT byte-identical (snapdiff_paths) and that their job SETS + * genuinely differ (job2 present in B, absent in A) — real content + * divergence, not a cosmetic LSN-header mismatch. + * + * ── Scenario 2: test_bug857_marker_checkpoint_converges_across_members ── + * The identical shared sequence, this time routed through the REAL, + * current apply_committed_entry() dispatch (persist_apply_pump_run) on + * both members. Member A catches up in a single pump-run call over the + * whole range; member B processes job1+marker in one call and only later + * commits+applies job2 in a separate second call — genuinely different + * processing pace. Asserts both members' checkpoint at the marker's own + * LSN exists and is byte-identical (snapdiff_paths) regardless of that + * pacing difference. + */ + +#include + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +#include "cluster.h" +#include "config_repl.h" +#include "controller.capnp.h" +#include "hook.h" +#include "jobj.h" +#include "persist.h" +#include "snapdiff.h" +#include "wal_types.h" +#include "xce/cluster_def.h" +#include "xce/types.h" +#include "xstring.h" + +/* restore_job (job.c) has no dedicated header -- every direct-call site in + * this codebase declares it locally (mirrors persist.c's own extern at the + * top of that file). This file calls it directly (bypassing + * apply_committed_entry) in Scenario 1 for the reason explained above: the + * marker's LSN must never be dispatched through apply_committed_entry + * there, or the CURRENT codebase's marker-anchored checkpoint (task 5) + * would fire and mask the exact pre-fix behavior this test reproduces. */ +extern int restore_job(cluster_t* c, uint64_t jobid_unused, + const void* capnp_payload, size_t len, + uint64_t entry_lsn); + +/* jobj.c's jobsub table and the process-global xstring table are shared + * across every test file in the controller_unit_test binary -- guard + * idempotently, mirroring every other config-upgrade-snapshot test file + * (job_obj_init itself is also independently idempotent via its own + * process-global atomic flag, jobj.c -- this local guard just skips the + * redundant call within this file's own repeated test invocations). */ +static int g_b857_jobobj_ready; + +typedef struct { + cluster_t c; + persist_t p; + char tmpdir[256]; +} b857_t; + +/* Fixture mirrors test_upgrade_snapshot_apply.c's tusa_t/tusa_setup exactly + * (real disk-backed persist_t + a real but otherwise-empty cluster_t with + * jobmgr/qmgr/workermgr/resmgr as xkvmgr_type instances) -- not reused + * directly since tusa_setup/tusa_t are file-static, matching this + * codebase's established convention of each test file keeping its own + * minimal local copy of such fixtures (e.g. test_replay_apply_seam.c's + * trr_make_fresh_persist mirroring test_persist_recovery.c's + * make_fresh_persist). `label` must be short and filesystem-safe -- used + * as the hostname, the persist_set_workdir name, AND the tmpdir prefix. */ +static void b857_setup(b857_t* t, const char* label) +{ + kvmgr_params_t int_params = { .key_type = KVMGR_KEY_INT, + .nslots = 32, .delta = 16 }; + kvmgr_params_t str_params = { .key_type = KVMGR_KEY_STRING, + .nslots = 32, .delta = 16 }; + + if (makeString((char*)"b857-probe") == NULL) + xstring_table_init(64); + + if (!g_b857_jobobj_ready) { + TEST_ASSERT_EQUAL_INT(0, job_obj_init(32, 32)); + g_b857_jobobj_ready = 1; + } + + memset(t, 0, sizeof(*t)); + t->c.myhost = &t->c.myhost_info; + t->c.myhost_info.name = (char*)label; + t->c.myhost_info.key = (char*)""; + + TEST_ASSERT_EQUAL_INT(0, + xce_hook_init(&t->c.hooksys, XCE_CONTROLLER_HOOK_MAX)); + + t->c.jobmgr = makeInstance(&xkvmgr_type, &int_params); + t->c.qmgr = makeInstance(&xkvmgr_type, &str_params); + t->c.workermgr = makeInstance(&xkvmgr_type, &str_params); + t->c.resmgr = makeInstance(&xkvmgr_type, &str_params); + TEST_ASSERT_NOT_NULL(t->c.jobmgr); + TEST_ASSERT_NOT_NULL(t->c.qmgr); + TEST_ASSERT_NOT_NULL(t->c.workermgr); + TEST_ASSERT_NOT_NULL(t->c.resmgr); + zarray_init(&t->c.sharedinst, 16, NULL); + + snprintf(t->tmpdir, sizeof(t->tmpdir), "/tmp/xce_%s_XXXXXX", label); + TEST_ASSERT_NOT_NULL(mkdtemp(t->tmpdir)); + + persist_config_t cfg = persist_config_defaults(); + cfg.wal_sync_ms = 5000; /* slow fsync -- no background races in tests */ + cfg.snap_keep_n = 4; + + persist_set_workdir(&t->p, t->tmpdir, label); + TEST_ASSERT_EQUAL_INT(0, persist_init(&t->p, &cfg, &t->c)); + TEST_ASSERT_EQUAL_INT(0, persist_start(&t->p)); +} + +/* Unconditional teardown -- callers must gather every observable they need + * to assert on BEFORE calling this (mirrors test_upgrade_snapshot_apply.c's + * documented longjmp-past-teardown discipline). */ +static void b857_teardown(b857_t* t) +{ + persist_stop(&t->p); + persist_fini(&t->p); + + zarray_fini(&t->c.sharedinst); + if (t->c.resmgr) dereference(t->c.resmgr); + if (t->c.workermgr) dereference(t->c.workermgr); + if (t->c.qmgr) dereference(t->c.qmgr); + if (t->c.jobmgr) dereference(t->c.jobmgr); + xce_hook_fini(&t->c.hooksys); + + char cmd[512]; + snprintf(cmd, sizeof(cmd), "rm -rf %s", t->tmpdir); + if (system(cmd) != 0) + fprintf(stderr, "cleanup warning: rm -rf %s failed\n", t->tmpdir); +} + +/* Encode a minimal, real job into a WAL_JOB_SUBMIT payload -- mirrors + * test_replay_apply_seam.c's trr_encode_job exactly (capnp_encode_job + * itself is file-static in persist.c, not reusable across translation + * units, hence this small local copy). */ +static int b857_encode_job(uint64_t jobid, const char* queue, + uint8_t** out, size_t* out_len) +{ + job_submit_data_t submit; + memset(&submit, 0, sizeof(submit)); + submit.queue = (char*)queue; + submit.user = (char*)"b857-tester"; + + xce_job_t j; + memset(&j, 0, sizeof(j)); + j.jobid = jobid; + j.state = JOB_STAT_PEND; + j.submit = &submit; + + struct capn c; + struct capn_segment* cs; + struct Job cj; + Job_ptr jp; + + capn_init_malloc(&c); + cs = capn_root(&c).seg; + encode_Job(cs, &cj, &j); + jp = new_Job(cs); + write_Job(&cj, jp); + capn_setp(capn_root(&c), 0, jp.p); + + *out_len = capn_size(&c); + *out = malloc(*out_len); + if (!*out) { capn_free(&c); return -ENOMEM; } + capn_write_mem(&c, *out, *out_len, 0); + capn_free(&c); + return 0; +} + +static bool b857_job_exists(var jobmgr, uint64_t jobid) +{ + void* existing = NULL; + lock(jobmgr, RTTI_LOCK_READ); + int found = key_find(jobmgr, (void*)jobid, &existing); + unlock(jobmgr); + return found > 0 && existing != NULL; +} + +/* Mirrors test_upgrade_snapshot_apply.c's tusa_snapshot_exists path + * construction exactly (same "snap-.capnp" naming convention the + * production checkpoint code uses). */ +static void b857_snapshot_path(persist_t* p, uint64_t lsn, char* buf, + size_t bufsz) +{ + snprintf(buf, bufsz, "%s/snap-%016" PRIx64 ".capnp", p->snap_path, lsn); +} + +/* ── Scenario 1 (Req 6.2, "reproduce ... on the pre-fix code") ──────────── */ + +static void test_bug857_threshold_checkpoint_diverges_across_members(void) +{ + b857_t A, B; + b857_setup(&A, "b857oa"); + b857_setup(&B, "b857ob"); + + uint8_t* job1_payload = NULL; size_t job1_len = 0; + int rc_enc1 = b857_encode_job(857001, "b857q", &job1_payload, &job1_len); + + uint8_t marker_sha[32]; + memset(marker_sha, 0xB8, sizeof(marker_sha)); + uint8_t marker_payload[WAL_CONFIG_MARKER_PAYLOAD_LEN]; + size_t marker_out_len = 0; + int rc_marker_enc = config_marker_encode(0x8570000000000001ULL, marker_sha, + marker_payload, + WAL_CONFIG_MARKER_PAYLOAD_LEN, + &marker_out_len); + + uint8_t* job2_payload = NULL; size_t job2_len = 0; + int rc_enc2 = b857_encode_job(857002, "b857q", &job2_payload, &job2_len); + + /* Both members physically receive the IDENTICAL committed sequence -- + * job1 @ lsn1, config-change marker @ lsn2, job2 @ lsn3 -- mirroring + * what majority replication of a real cluster guarantees. */ + int rc_wal_a1 = persist_wal_async(&A.p, WAL_JOB_SUBMIT, job1_payload, + (uint32_t)job1_len); + int rc_wal_a2 = persist_wal_async(&A.p, WAL_CONFIG_MARKER, marker_payload, + WAL_CONFIG_MARKER_PAYLOAD_LEN); + int rc_wal_a3 = persist_wal_async(&A.p, WAL_JOB_SUBMIT, job2_payload, + (uint32_t)job2_len); + + int rc_wal_b1 = persist_wal_async(&B.p, WAL_JOB_SUBMIT, job1_payload, + (uint32_t)job1_len); + int rc_wal_b2 = persist_wal_async(&B.p, WAL_CONFIG_MARKER, marker_payload, + WAL_CONFIG_MARKER_PAYLOAD_LEN); + int rc_wal_b3 = persist_wal_async(&B.p, WAL_JOB_SUBMIT, job2_payload, + (uint32_t)job2_len); + + /* Member A's own threshold trips EARLY -- right after job1, before job2 + * exists locally. Entity effect driven directly via restore_job(), the + * exact function apply_committed_entry()'s WAL_JOB_SUBMIT case itself + * calls -- the marker's LSN is never dispatched through + * apply_committed_entry() at all, so the CURRENT codebase's + * marker-anchored checkpoint (task 5) never fires here, faithfully + * reproducing the OLD, pre-task-5 decoupling: checkpoint content/timing + * driven only by schedule_checkpoint's independent WAL-record + * threshold (simulated by calling persist_checkpoint(), its real + * production entry point, directly). */ + int rc_restore_a1 = restore_job(&A.c, 0, job1_payload, job1_len, 1); + atomic_store_explicit(&A.p.last_applied_lsn, 1, memory_order_relaxed); + int rc_ckpt_a = persist_checkpoint(&A.p); + uint64_t ckpt_lsn_a = A.p.checkpoint_lsn; + + /* Member B's own threshold does not trip until LATER -- by then job2 + * was already locally visible too (ordinary cluster activity continued + * around the upgrade before B happened to checkpoint/restart). */ + int rc_restore_b1 = restore_job(&B.c, 0, job1_payload, job1_len, 1); + int rc_restore_b2 = restore_job(&B.c, 0, job2_payload, job2_len, 3); + atomic_store_explicit(&B.p.last_applied_lsn, 3, memory_order_relaxed); + int rc_ckpt_b = persist_checkpoint(&B.p); + uint64_t ckpt_lsn_b = B.p.checkpoint_lsn; + + bool job1_in_a = b857_job_exists(A.c.jobmgr, 857001); + bool job1_in_b = b857_job_exists(B.c.jobmgr, 857001); + bool job2_in_a = b857_job_exists(A.c.jobmgr, 857002); + bool job2_in_b = b857_job_exists(B.c.jobmgr, 857002); + + char snap_a[4096], snap_b[4096]; + b857_snapshot_path(&A.p, ckpt_lsn_a, snap_a, sizeof(snap_a)); + b857_snapshot_path(&B.p, ckpt_lsn_b, snap_b, sizeof(snap_b)); + + snapdiff_report_t rep; + memset(&rep, 0, sizeof(rep)); + int diff_rc = snapdiff_paths(snap_a, snap_b, NULL, &rep); + + const uint64_t marker_lsn = 2; + + b857_teardown(&A); + b857_teardown(&B); + free(job1_payload); + free(job2_payload); + + TEST_ASSERT_EQUAL_INT(0, rc_enc1); + TEST_ASSERT_EQUAL_INT(0, rc_marker_enc); + TEST_ASSERT_EQUAL_INT(0, rc_enc2); + TEST_ASSERT_EQUAL_INT(0, rc_wal_a1); + TEST_ASSERT_EQUAL_INT(0, rc_wal_a2); + TEST_ASSERT_EQUAL_INT(0, rc_wal_a3); + TEST_ASSERT_EQUAL_INT(0, rc_wal_b1); + TEST_ASSERT_EQUAL_INT(0, rc_wal_b2); + TEST_ASSERT_EQUAL_INT(0, rc_wal_b3); + TEST_ASSERT_EQUAL_INT(0, rc_restore_a1); + TEST_ASSERT_EQUAL_INT(0, rc_restore_b1); + TEST_ASSERT_EQUAL_INT(0, rc_restore_b2); + TEST_ASSERT_EQUAL_INT(0, rc_ckpt_a); + TEST_ASSERT_EQUAL_INT(0, rc_ckpt_b); + + /* Neither member's checkpoint is anchored to the marker's own lsn (2) + * -- this IS the bug: "no snapshot pinning an identical post-upgrade + * state" (bug-857's own root-cause wording). */ + TEST_ASSERT_EQUAL_UINT64(1, ckpt_lsn_a); + TEST_ASSERT_EQUAL_UINT64(3, ckpt_lsn_b); + TEST_ASSERT_NOT_EQUAL(marker_lsn, ckpt_lsn_a); + TEST_ASSERT_NOT_EQUAL(marker_lsn, ckpt_lsn_b); + + /* Real, content-level divergence -- the JOB SET each member actually + * materialized genuinely differs, not merely a cosmetic LSN-header + * mismatch. */ + TEST_ASSERT_TRUE(job1_in_a); + TEST_ASSERT_TRUE(job1_in_b); + TEST_ASSERT_FALSE_MESSAGE(job2_in_a, + "member A's checkpoint predates job2 -- must NOT contain it"); + TEST_ASSERT_TRUE_MESSAGE(job2_in_b, + "member B's checkpoint postdates job2 -- must contain it"); + + /* And the resulting ON-DISK ARTIFACTS -- what a rejoining or + * catching-up member would actually receive via snapshot transfer -- + * genuinely diverge too. */ + TEST_ASSERT_EQUAL_INT(1, diff_rc); + TEST_ASSERT_FALSE_MESSAGE(rep.identical, + "pre-fix: two members' checkpoints materialized around the SAME " + "config-change marker must NOT be byte-identical -- this is the " + "bug-857 divergence, reproduced"); + + printf("test_bug857_threshold_checkpoint_diverges_across_members: " + "PASS\n"); +} + +/* ── Scenario 2 (Req 6.2, "... and pass on the fixed code") ─────────────── */ + +static void test_bug857_marker_checkpoint_converges_across_members(void) +{ + b857_t A, B; + b857_setup(&A, "b857na"); + b857_setup(&B, "b857nb"); + + uint8_t* job1_payload = NULL; size_t job1_len = 0; + int rc_enc1 = b857_encode_job(857101, "b857q", &job1_payload, &job1_len); + + uint8_t marker_sha[32]; + memset(marker_sha, 0xC9, sizeof(marker_sha)); + uint8_t marker_payload[WAL_CONFIG_MARKER_PAYLOAD_LEN]; + size_t marker_out_len = 0; + int rc_marker_enc = config_marker_encode(0x8570000000000002ULL, marker_sha, + marker_payload, + WAL_CONFIG_MARKER_PAYLOAD_LEN, + &marker_out_len); + + uint8_t* job2_payload = NULL; size_t job2_len = 0; + int rc_enc2 = b857_encode_job(857102, "b857q", &job2_payload, &job2_len); + + /* Member A: catches up in a SINGLE pump-run call over the whole range + * [job1, marker, job2] -- as if it processed everything in one + * uninterrupted burst. */ + int rc_wal_a1 = persist_wal_async(&A.p, WAL_JOB_SUBMIT, job1_payload, + (uint32_t)job1_len); + int rc_wal_a2 = persist_wal_async(&A.p, WAL_CONFIG_MARKER, marker_payload, + WAL_CONFIG_MARKER_PAYLOAD_LEN); + int rc_wal_a3 = persist_wal_async(&A.p, WAL_JOB_SUBMIT, job2_payload, + (uint32_t)job2_len); + uint64_t committed_a = persist_committed_lsn_advance_atomic(&A.p, 3); + int applied_a = persist_apply_pump_run(&A.p); + + /* Member B: processes job1+marker FIRST (one pump-run call, simulating + * a pause/restart boundary exactly at the marker), and only later + * commits+applies job2 in a SEPARATE second pump-run call -- + * genuinely different real-world processing pace than member A. */ + int rc_wal_b1 = persist_wal_async(&B.p, WAL_JOB_SUBMIT, job1_payload, + (uint32_t)job1_len); + int rc_wal_b2 = persist_wal_async(&B.p, WAL_CONFIG_MARKER, marker_payload, + WAL_CONFIG_MARKER_PAYLOAD_LEN); + uint64_t committed_b1 = persist_committed_lsn_advance_atomic(&B.p, 2); + int applied_b1 = persist_apply_pump_run(&B.p); + + int rc_wal_b3 = persist_wal_async(&B.p, WAL_JOB_SUBMIT, job2_payload, + (uint32_t)job2_len); + uint64_t committed_b2 = persist_committed_lsn_advance_atomic(&B.p, 3); + int applied_b2 = persist_apply_pump_run(&B.p); + + const uint64_t marker_lsn = 2; + + char snap_a[4096], snap_b[4096]; + b857_snapshot_path(&A.p, marker_lsn, snap_a, sizeof(snap_a)); + b857_snapshot_path(&B.p, marker_lsn, snap_b, sizeof(snap_b)); + + bool snap_a_exists = (access(snap_a, F_OK) == 0); + bool snap_b_exists = (access(snap_b, F_OK) == 0); + + snapdiff_report_t rep; + memset(&rep, 0, sizeof(rep)); + int diff_rc = snapdiff_paths(snap_a, snap_b, NULL, &rep); + + b857_teardown(&A); + b857_teardown(&B); + free(job1_payload); + free(job2_payload); + + TEST_ASSERT_EQUAL_INT(0, rc_enc1); + TEST_ASSERT_EQUAL_INT(0, rc_marker_enc); + TEST_ASSERT_EQUAL_INT(0, rc_enc2); + TEST_ASSERT_EQUAL_INT(0, rc_wal_a1); + TEST_ASSERT_EQUAL_INT(0, rc_wal_a2); + TEST_ASSERT_EQUAL_INT(0, rc_wal_a3); + TEST_ASSERT_EQUAL_INT(0, rc_wal_b1); + TEST_ASSERT_EQUAL_INT(0, rc_wal_b2); + TEST_ASSERT_EQUAL_INT(0, rc_wal_b3); + + TEST_ASSERT_EQUAL_UINT64(3, committed_a); + TEST_ASSERT_EQUAL_INT(3, applied_a); + TEST_ASSERT_EQUAL_UINT64(2, committed_b1); + TEST_ASSERT_EQUAL_INT(2, applied_b1); + TEST_ASSERT_EQUAL_UINT64(3, committed_b2); + TEST_ASSERT_EQUAL_INT(1, applied_b2); + + TEST_ASSERT_TRUE_MESSAGE(snap_a_exists, + "member A must checkpoint at the marker's own lsn, even mid-batch " + "within a single pump-run call"); + TEST_ASSERT_TRUE_MESSAGE(snap_b_exists, + "member B must checkpoint at the marker's own lsn, even though its " + "own processing was split across two separate pump-run calls"); + + /* The decisive proof: regardless of each member's own processing pace + * (A: one burst; B: paused exactly at the marker, job2 applied later), + * both marker-anchored checkpoints are byte-identical -- convergence, + * closing the bug-857 divergence Scenario 1 reproduced above. */ + TEST_ASSERT_EQUAL_INT_MESSAGE(0, diff_rc, + "post-fix: both members' marker-anchored checkpoints must be " + "byte-identical regardless of differing processing pace"); + TEST_ASSERT_TRUE_MESSAGE(rep.identical, + "post-fix: materialized state converges identically across " + "members -- bug-857 no longer occurs"); + + printf("test_bug857_marker_checkpoint_converges_across_members: " + "PASS\n"); +} + +/* ── Dispatch ────────────────────────────────────────────────────────── */ + +void test_bug857_regression(void) +{ + UnitySetTestFile(__FILE__); + printf("\n>> bug-857 materialized-state divergence regression " + "(task 8.5)\n\n"); + + RUN_TEST(test_bug857_threshold_checkpoint_diverges_across_members); + RUN_TEST(test_bug857_marker_checkpoint_converges_across_members); +} diff --git a/src/controller/testsuite/test_commit_barrier_reply.c b/src/controller/testsuite/test_commit_barrier_reply.c index 5010fde..478f49b 100644 --- a/src/controller/testsuite/test_commit_barrier_reply.c +++ b/src/controller/testsuite/test_commit_barrier_reply.c @@ -66,6 +66,7 @@ #include #include #include +#include #include #include @@ -3288,6 +3289,179 @@ static void test_fact_state_unchanged_throughout_quorum_loss_outage(void) "PASS\n"); } +/* ── Batch failure propagation (raft-adapter-conformance task 5.2, Req 5.3) + * ────────────────────────────────────────────────────────────────────── + * + * persist_submit_job_payloads_async (persist.c:6135-6209) walks an xlist_t + * of xce_job_t* payloads and tracks a single `first_rc` across the loop: + * the FIRST payload whose append_job_wal_entry_local call fails sets + * first_rc and resolves that payload's completion callback (fn) with the + * failing rc (persist.c:6161-6166); every payload processed AFTER that + * point takes the `if (first_rc != 0)` branch and resolves with the SAME + * rc WITHOUT attempting its own append (persist.c:6150-6158) -- so no + * payload in a batch that has already failed can silently complete on + * its own. + * + * No existing fixture in this file or in test_commit_barrier_rollout.c + * engineers append_job_wal_entry_local/persist_wal_async itself to fail + * (the two existing XCE_TESTING fault hooks -- test_force_fsync_fail and + * test_force_job_encode_fail_at -- only guard the flusher's fdatasync and + * the SEPARATE collect_job_frames snapshot-encode loop, neither of which + * this call path reaches). This test instead forces a real filesystem + * failure: persist_init() has already mkdir_p'd persist_t's wal_path + * directory by the time it returns, so revoking write permission on that + * directory BEFORE the first append makes open_new_segment's + * open(..., O_CREAT) fail with EACCES on the very first payload -- + * persist_wal_async surfaces this as -EIO (persist.c:988-992) before + * current_lsn is ever incremented. Making the FIRST payload the failing + * one exercises both branches above: payload 0 hits the original-failure + * branch, payloads 1 and 2 hit the propagation branch. + * + * A bare (cluster == NULL) persist_t is used, with no commit engine wired + * (p->repl.ce stays NULL) and persist_start() never called -- every fn() + * resolution in persist_submit_job_payloads_async's success path is then + * synchronous too (persist.c:6178-6181), so the whole batch resolves + * within the single call under test, matching the same bare-persist_t, + * no-commit-engine technique test_commit_durability.c's dur_flag_persist + * already uses for a persist_init-only fixture (persist_fini alone tears + * it down -- persist_start/persist_stop were never paired). + * + * The injected fault is made deliberately TRANSIENT, not permanent: the + * notify callback restores write permission on the WAL directory the + * instant it observes payload 0's failure, before payload 1 is ever + * processed. This is what makes the test actually exercise the + * first_rc-propagation branch rather than merely re-observing the same + * permanently-broken directory three times over: if a future change + * deleted the `if (first_rc != 0) { fn(...); continue; }` short-circuit, + * payload 1 would attempt its OWN append against a directory that is + * writable again by then, and that attempt would SUCCEED -- turning this + * test's per-payload rc assertions below into an observable failure + * instead of a vacuously-identical result. */ + +typedef struct { + int count; + uint64_t lsns[4]; + int rcs[4]; +} cbrp_bf_notify_obs_t; + +/* Set by the test right after persist_init(), before the fault-injecting + * chmod(); read back by cbrp_bf_notify_fn to restore write permission the + * moment the first (and, on correct code, only genuinely-attempted) + * payload's failure is observed. */ +static char g_cbrp_bf_wal_path[512]; + +static void cbrp_bf_notify_fn(void *ctx, uint64_t lsn, int rc) +{ + cbrp_bf_notify_obs_t *obs = (cbrp_bf_notify_obs_t *)ctx; + if (obs->count == 0) + chmod(g_cbrp_bf_wal_path, 0700); + if (obs->count < 4) { + obs->lsns[obs->count] = lsn; + obs->rcs[obs->count] = rc; + } + obs->count++; +} + +static job_submit_data_t g_cbrp_bf_submit; + +static void test_batch_payload_persist_failure_propagates_to_whole_batch(void) +{ + persist_t p; + persist_config_t cfg; + char tmpdir[256]; + xlist_t plist; + uint64_t out_lsns[3] = { 0, 0, 0 }; + cbrp_bf_notify_obs_t obs; + int rc; + int i; + + memset(&obs, 0, sizeof(obs)); + memset(&g_cbrp_bf_submit, 0, sizeof(g_cbrp_bf_submit)); + g_cbrp_bf_submit.queue = (char *)"normal"; + g_cbrp_bf_submit.user = (char *)"tester"; + g_cbrp_bf_submit.mintasks = 1; + g_cbrp_bf_submit.maxtasks = 1; + g_cbrp_bf_submit.start_info = NULL; + g_cbrp_bf_submit.job_name = (char *)"batch-fail-job"; + + memset(&p, 0, sizeof(p)); + cfg = persist_config_defaults(); + cfg.wal_sync_ms = 5000; + snprintf(tmpdir, sizeof(tmpdir), "/tmp/xce_cbrpbf_XXXXXX"); + TEST_ASSERT_NOT_NULL(mkdtemp(tmpdir)); + persist_set_workdir(&p, tmpdir, "ctrl-cbrpbf"); + /* cluster == NULL: append_job_wal_entry_local routes straight through + * persist_wal_async (no raft library, no commit engine involved). */ + TEST_ASSERT_EQUAL_INT(0, persist_init(&p, &cfg, NULL)); + + /* persist_init already created p.wal_path. Revoke write permission on + * it now, before any append is attempted, so the first payload's + * open_new_segment() call fails deterministically. cbrp_bf_notify_fn + * restores it the instant payload 0's failure is observed (see the + * comment above), making the fault transient rather than permanent. */ + snprintf(g_cbrp_bf_wal_path, sizeof(g_cbrp_bf_wal_path), "%s", p.wal_path); + TEST_ASSERT_EQUAL_INT_MESSAGE(0, chmod(p.wal_path, 0500), + "test precondition: must be able to revoke write permission on " + "the WAL directory"); + + TEST_ASSERT_EQUAL_INT(0, xlist_init(&plist, 3)); + for (i = 0; i < 3; i++) { + xce_job_t *jp = calloc(1, sizeof(*jp)); + TEST_ASSERT_NOT_NULL(jp); + jp->submit = &g_cbrp_bf_submit; + jp->jobid = 70000 + (uint64_t)i; + jp->sub_time = time(NULL); + jp->queue_time = jp->sub_time; + jp->state = JOB_STAT_PEND; + TEST_ASSERT_TRUE(xlist_store(&plist, jp) >= 0); + } + + rc = persist_submit_job_payloads_async(&p, &plist, out_lsns, + cbrp_bf_notify_fn, &obs); + + /* Defensive fallback: cbrp_bf_notify_fn already restores write + * permission once the first payload's failure is observed (the + * normal case), but make sure the directory is writable before any + * further filesystem access (including this test's own cleanup) + * regardless of how fn was actually invoked. */ + chmod(p.wal_path, 0700); + + TEST_ASSERT_EQUAL_INT_MESSAGE(-EIO, rc, + "the forced WAL-directory permission failure must surface as the " + "same -EIO persist_wal_async returns on an open_new_segment " + "failure (Req 5.1)"); + TEST_ASSERT_EQUAL_INT_MESSAGE(3, obs.count, + "every payload in the batch must resolve its completion callback " + "exactly once, even though none of them ever durably persisted"); + for (i = 0; i < 3; i++) { + TEST_ASSERT_EQUAL_INT_MESSAGE(rc, obs.rcs[i], + "every payload -- not just the one whose append actually " + "failed -- must resolve with the SAME first-failure rc (Req " + "5.3): a future change that lets a later payload silently " + "succeed instead must fail this assertion"); + TEST_ASSERT_EQUAL_UINT64_MESSAGE(0, obs.lsns[i], + "a failed payload must never be resolved with a real " + "(non-zero) lsn"); + } + TEST_ASSERT_EQUAL_UINT64_MESSAGE(1, p.current_lsn, + "current_lsn must not advance for any payload in a batch whose " + "very first append already failed (Req 5.2)"); + + for (i = 0; i < plist.count; i++) { + xce_job_t *jp = (xce_job_t *)xlist_get(&plist, i); + free(jp); + } + xlist_fini(&plist); + persist_fini(&p); + { + char cmd[300]; + snprintf(cmd, sizeof(cmd), "rm -rf %s", tmpdir); + system(cmd); + } + printf("test_batch_payload_persist_failure_propagates_to_whole_batch: " + "PASS\n"); +} + /* ── Test group entry point ──────────────────────────────────────────── */ void test_commit_barrier_reply(void) @@ -3356,4 +3530,7 @@ void test_commit_barrier_reply(void) /* Durable retention held for the outage's sustained duration under * genuine quorum loss (task 4.2, Req 6.1, 6.2) */ RUN_TEST(test_fact_state_unchanged_throughout_quorum_loss_outage); + /* Batch failure propagation regression-lock (raft-adapter-conformance + * task 5.2, Req 5.3) */ + RUN_TEST(test_batch_payload_persist_failure_propagates_to_whole_batch); } diff --git a/src/controller/testsuite/test_commit_barrier_rollout.c b/src/controller/testsuite/test_commit_barrier_rollout.c index c976530..09a3a8a 100644 --- a/src/controller/testsuite/test_commit_barrier_rollout.c +++ b/src/controller/testsuite/test_commit_barrier_rollout.c @@ -1505,13 +1505,18 @@ static void test_upgrade_config_barrier_failure_error_reply_no_restart(void) printf("test_upgrade_config_barrier_failure_error_reply_no_restart: PASS\n"); } -/* Success path PIN: with a full majority of covering ACKs the existing - * behavior is unchanged — status-0 reply with the upgradeConfigReply - * payload, committed_config_tag at the saved tag, restart requested. - * Both standbys pre-ack UINT64_MAX (covers any tag — the new tag is only - * known after conf_save_config hashes the re-encoded blob), so the case - * is green under both the legacy counting and the per-push arithmetic. */ -static void test_upgrade_config_majority_ack_success_unchanged(void) +/* Success path PIN: with a full majority of covering ACKs, status-0 reply + * with the upgradeConfigReply payload and committed_config_tag at the saved + * tag are unchanged — but as of config-upgrade-snapshot task 7 the + * restart/replay fallback is retired: a successful upgrade must NOT set + * restart_requested (Req 1.2/1.3/1.4/2.2/5.4). Materialization is now + * driven entirely by the marker-apply trigger (apply_committed_entry's + * WAL_CONFIG_MARKER case, persist.c, task 5), decoupled from this + * request-handling path. Both standbys pre-ack UINT64_MAX (covers any tag + * — the new tag is only known after conf_save_config hashes the re-encoded + * blob), so the case is green under both the legacy counting and the + * per-push arithmetic. */ +static void test_upgrade_config_majority_ack_success_no_restart(void) { uint8_t *blob; size_t blen = 0; @@ -1530,7 +1535,7 @@ static void test_upgrade_config_majority_ack_success_unchanged(void) /* Act */ rc = handle_upgrade_config(&g_cb5_c, &g_cb5_req_ep, &g_cb5_req); - /* Assert: existing success reply + restart behavior unchanged */ + /* Assert: existing success reply unchanged; restart is NOT requested */ TEST_ASSERT_EQUAL_INT_MESSAGE(0, rc, "a majority-acked upgrade must succeed"); cb5_scan_replies(&g_cb5_req_ep, &obs); @@ -1547,12 +1552,98 @@ static void test_upgrade_config_majority_ack_success_unchanged(void) atomic_load_explicit(&g_cb5_c.ha.committed_config_tag, memory_order_acquire), "a majority-acked config must be committed at the saved tag (Req 4.1)"); - TEST_ASSERT_EQUAL_INT_MESSAGE(1, atomic_load(&g_cb5_c.restart_requested), - "a successful upgrade must request the activation restart"); + TEST_ASSERT_EQUAL_INT_MESSAGE(0, atomic_load(&g_cb5_c.restart_requested), + "a successful upgrade must NOT request a restart -- materialization" + " happens via the marker-apply trigger alone (task 7, Req 1.2-1.4)"); free(blob); cb5_teardown(); - printf("test_upgrade_config_majority_ack_success_unchanged: PASS\n"); + printf("test_upgrade_config_majority_ack_success_no_restart: PASS\n"); +} + +/* ── config-upgrade-snapshot task 7: marker-committed test hook ─────────── */ + +/* Captures each xce_upgrade_marker_committed_hook firing: the call count, + * the version_tag observed, and a snapshot of ha.committed_config_tag taken + * AT FIRE TIME -- proving the hook runs strictly after config_commit_change() + * has already advanced the committed tag (i.e. after the marker reached the + * committed prefix), not before. */ +static int g_cb5_hook_calls; +static uint64_t g_cb5_hook_last_tag; +static uint64_t g_cb5_hook_committed_tag_at_fire; + +static int cb5_marker_committed_hook(cluster_t *c, uint64_t version_tag) +{ + g_cb5_hook_calls++; + g_cb5_hook_last_tag = version_tag; + g_cb5_hook_committed_tag_at_fire = + atomic_load_explicit(&c->ha.committed_config_tag, memory_order_acquire); + return 0; +} + +/* The new #ifdef XCE_TESTING seam (config-upgrade-snapshot task 7, + * xce_upgrade_marker_committed_hook in config_repl.c) must fire exactly + * once per successful upgrade, right after config_commit_change() succeeds + * -- i.e. after the configuration-change marker has reached the committed + * prefix -- and must leave every other observable behavior (reply, + * committed tag, no restart) exactly as the NULL-hook case already asserts, + * proving the seam is a true no-op in production (hook defaults to NULL). */ +static void test_upgrade_config_marker_committed_hook_fires_once_after_commit(void) +{ + uint8_t *blob; + size_t blen = 0; + uint8_t sha[32]; + int rc; + cb5_reply_obs_t obs = { 0 }; + extern int (*xce_upgrade_marker_committed_hook)(cluster_t *, uint64_t); + + /* Arrange: full covering pre-ack from both standbys (same fixture as + * the no-restart success-path test) */ + cb5_setup_upgrade(); + blob = cb5_make_config_blob(&blen); + SHA256(blob, blen, sha); + cb5_arrange_upgrade_req(blob, blen, sha); + repl_on_config_ack(&g_cb5_c.persist.repl, &g_cb5_sb_ep[0], UINT64_MAX); + repl_on_config_ack(&g_cb5_c.persist.repl, &g_cb5_sb_ep[1], UINT64_MAX); + + g_cb5_hook_calls = 0; + g_cb5_hook_last_tag = 0; + g_cb5_hook_committed_tag_at_fire = 0; + xce_upgrade_marker_committed_hook = cb5_marker_committed_hook; + + /* Act */ + rc = handle_upgrade_config(&g_cb5_c, &g_cb5_req_ep, &g_cb5_req); + + /* Assert: fired exactly once, with the just-committed tag, and only + * after ha.committed_config_tag already reflects that same tag. */ + TEST_ASSERT_EQUAL_INT_MESSAGE(0, rc, "a majority-acked upgrade must succeed"); + TEST_ASSERT_EQUAL_INT_MESSAGE(1, g_cb5_hook_calls, + "the marker-committed test hook must fire exactly once per" + " successful upgrade (task 7)"); + TEST_ASSERT_EQUAL_UINT64_MESSAGE(g_cb5_myconf.config_version_tag, + g_cb5_hook_last_tag, + "the hook must observe the marker's own version tag"); + TEST_ASSERT_EQUAL_UINT64_MESSAGE(g_cb5_myconf.config_version_tag, + g_cb5_hook_committed_tag_at_fire, + "the hook must fire AFTER config_commit_change already advanced" + " committed_config_tag, not before"); + + /* The rest of the observable behavior must be identical to the + * NULL-hook (production default) case -- the hook is side-effect-free + * beyond invoking the test callback itself. */ + cb5_scan_replies(&g_cb5_req_ep, &obs); + TEST_ASSERT_EQUAL_INT_MESSAGE(1, obs.n_replies, + "the requester must still receive exactly one reply with the hook set"); + TEST_ASSERT_EQUAL_INT_MESSAGE(0, obs.last_status, + "the success ACK must still carry status 0 with the hook set"); + TEST_ASSERT_EQUAL_INT_MESSAGE(0, atomic_load(&g_cb5_c.restart_requested), + "the hook firing must not resurrect the retired restart request"); + + xce_upgrade_marker_committed_hook = NULL; + free(blob); + cb5_teardown(); + printf("test_upgrade_config_marker_committed_hook_fires_once_after_commit:" + " PASS\n"); } /* ════════════════════════════════════════════════════════════════════════ @@ -2351,7 +2442,8 @@ void test_commit_barrier_rollout(void) RUN_TEST(test_push_config_withheld_acks_returns_etimedout); RUN_TEST(test_push_config_majority_acks_returns_zero_and_commits); RUN_TEST(test_upgrade_config_barrier_failure_error_reply_no_restart); - RUN_TEST(test_upgrade_config_majority_ack_success_unchanged); + RUN_TEST(test_upgrade_config_majority_ack_success_no_restart); + RUN_TEST(test_upgrade_config_marker_committed_hook_fires_once_after_commit); /* Task 5.2 remediation r1 — production wire-path ACK ingestion * (completes the unlanded half of ha-config-bootstrap task 8.1) */ RUN_TEST(test_config_ack_wire_path_completes_barrier); diff --git a/src/controller/testsuite/test_config_repl.c b/src/controller/testsuite/test_config_repl.c index 3be6808..a0336c0 100644 --- a/src/controller/testsuite/test_config_repl.c +++ b/src/controller/testsuite/test_config_repl.c @@ -21,6 +21,7 @@ #include +#include "cluster.h" #include "commit.h" #include "config_repl.h" #include "controller.capnp.h" @@ -29,6 +30,10 @@ #include "persist.h" #include "repl.h" #include "request.h" +#include "snapdiff.h" /* snapdiff_paths -- task 8.7 Scenario 2: prove a + * leadership-change-driven materialization drain + * produces a byte-identical checkpoint to an ordinary, + * non-promoted drain of the same marker */ #include "typemap.h" #include "wal_types.h" #include "xce/cluster_def.h" @@ -56,8 +61,16 @@ static char tmpdir[256]; static void cr_setup(void) { - snprintf(g_tmpdir, sizeof(g_tmpdir), "/tmp/test_cr_%d_%ld", - (int)getpid(), (long)time(NULL)); + static unsigned int cr_seq; + /* Unique per invocation, not just per (pid, second): the 1000+ tests in + * this suite routinely run within the same wall-clock second, and a + * Unity assertion failure longjmps out of the test, skipping the + * cr_teardown() that would rm -rf the dir — so a reused path would make + * the next test silently inherit the previous one's cluster.bin.* files + * and conf/current (observed as a cascade: a leaked trim-test dir made + * test_conf_get_saved_tag_no_config read a real tag instead of 0). */ + snprintf(g_tmpdir, sizeof(g_tmpdir), "/tmp/test_cr_%d_%u_%ld", + (int)getpid(), cr_seq++, (long)time(NULL)); mkdir(g_tmpdir, 0700); /* conf_save_config() writes to workdir/name/conf — mirror that here */ snprintf(g_instdir, sizeof(g_instdir), "%s/ctrl0", g_tmpdir); @@ -628,6 +641,36 @@ static void t42_teardown(cluster_t *c) free(c); } +/* config-upgrade-snapshot task 5: committing a WAL_CONFIG_MARKER now triggers + * an automatic forced checkpoint the instant the marker is APPLIED (not just + * committed) via the live apply pump -- persist_apply_pump_kick's dispatch is + * a CAS race between whichever thread reaches it first, which can be either + * this test's own thread (inside commit_submit's synchronous + * commit_resolve_pending call) or persist_start's independent fsync_worker + * thread (via commit_on_durable_advance) once durable_lsn advances. When the + * fsync thread wins that race, commit_submit/commit_engine's own WAIT mode + * returns having waited only for COMMIT, not for this now-real APPLY+ + * CHECKPOINT side effect to finish on that other thread -- a fixture's own + * subsequent LSN bookkeeping or explicit persist_checkpoint() call can then + * genuinely race the still-in-flight background checkpoint (observed as a + * flaky -EBUSY from persist_checkpoint() or an unexpectedly-advanced + * committed_lsn, depending on which check loses the race). This was always a + * latent, unsynchronized race in this fixture (the same one + * test_apply_pump.c's tap_wait_applied already documents and exists to + * close) -- applying a marker used to be a no-op, so racing on it was + * invisible; task 5 gives it a real, observable side effect for the first + * time. Poll persist_last_applied_lsn() up to a bounded deadline (mirrors + * tap_wait_applied exactly) before any LSN-sensitive step that follows a + * marker commit, closing the race rather than leaving it flaky. */ +static void t42_wait_applied(persist_t *p, uint64_t lsn, uint32_t deadline_ms) +{ + for (uint32_t waited = 0; waited < deadline_ms; waited += 5) { + if (persist_last_applied_lsn(p) >= lsn) + return; + usleep(5000); + } +} + /* Bring the node up as the raft LEADER at `term` (so raft_log_append is enabled * — it returns -EPERM off the leader; see make_leader in the adapter suite). */ static void t42_make_leader(cluster_t *c, uint64_t term, int n_peers) @@ -925,6 +968,14 @@ static void test_committed_marker_survives_checkpoint_trim(void) atomic_load_explicit(&c->persist.committed_lsn, memory_order_acquire); TEST_ASSERT_TRUE(committed >= 1); + /* config-upgrade-snapshot task 5: wait for the marker to be APPLIED (see + * t42_wait_applied's doc comment) before this test's own explicit + * persist_checkpoint() call below -- otherwise it can race the marker's + * own now-automatic checkpoint (possibly still running on the + * fsync_worker thread) and see a spurious -EBUSY from the shared + * checkpoint_in_progress guard. */ + t42_wait_applied(&c->persist, /*marker LSN*/1, 2000); + /* Sanity: before any trim, the live-WAL scan finds the marker. */ uint64_t got_tag = 0; uint8_t got_sha[32]; @@ -1005,6 +1056,9 @@ static myconf_t *t43_attach_myconf(cluster_t *c, const char *tmpdir) mc->name = strdup("ctrl-test"); mc->conf_keep_n = 2; mc->conffile = NULL; + /* bug-1476: the real load_primary_config()/config_activate_committed() + * paths this fixture drives now take mc->lock -- must be initialized. */ + TEST_ASSERT_EQUAL_INT(0, mylock_init(&mc->lock)); c->myconf = mc; return mc; } @@ -1020,12 +1074,16 @@ static void t43_free_myconf(cluster_t *c) free(mc->conffile); free(mc->workdir); free(mc->name); + mylock_fini(&mc->lock); free(mc); c->myconf = NULL; } /* Commit a WAL_CONFIG_MARKER for `sha`/`tag` through the real commit engine so - * config_committed_marker returns it (the committed-prefix authority 4.3 reads). */ + * config_committed_marker returns it (the committed-prefix authority 4.3 reads). + * Also waits for the marker to be APPLIED (see t42_wait_applied's doc comment) + * so callers' own subsequent LSN bookkeeping never races this marker's own + * task-5 automatic checkpoint, wherever it happens to run. */ static void t43_commit_marker(cluster_t *c, uint64_t tag, const uint8_t sha[32]) { uint64_t mlsn = 0; @@ -1035,6 +1093,7 @@ static void t43_commit_marker(cluster_t *c, uint64_t tag, const uint8_t sha[32]) commit_submit(&c->commit, mlsn, COMMIT_MODE_WAIT, 1000)); TEST_ASSERT_TRUE( atomic_load_explicit(&c->persist.committed_lsn, memory_order_acquire) >= mlsn); + t42_wait_applied(&c->persist, mlsn, 2000); } /* (4.3-a) MATCH activates: a committed marker whose locally-held bytes' sha256 @@ -1340,6 +1399,251 @@ static void test_config_activate_no_marker_falls_back_and_loads(void) printf("test_config_activate_no_marker_falls_back_and_loads: PASS\n"); } +/* ── config-upgrade-snapshot task 6.1: Activation Fence + * (upgrade_materialization_verify / upgrade_materialization_fenced, ha.c) + * ────────────────────────────────────────────────────────────────────── + * These tests reuse this file's own t42_/t43_ fixture helpers rather than + * duplicating them into a new file — the Activation Fence's verify function + * is a close sibling of config_activate_committed (tested just above), and + * every fixture piece it needs (a real cluster_t, a real commit engine, a + * real myconf/config file, real committed WAL_CONFIG_MARKERs) already lives + * here. task 8.3 owns broader dispatch-gate/promotion-gate fence coverage in + * its own new file (test_upgrade_activation_fence.c per design.md); this + * task's own boundary is ha.c/ha.h only, so its tests stay narrowly scoped + * to upgrade_materialization_verify/upgrade_materialization_fenced + * themselves. */ + +extern int upgrade_materialization_verify(cluster_t *c); +extern int upgrade_materialization_fenced(const cluster_t *c); + +/* (6.1-a) No committed marker yet: benign, not a divergence — fence stays + * clear, verify succeeds (mirrors config_activate_committed's own -ENOENT + * handling). */ +static void test_upgrade_materialization_verify_no_marker_clears_fence(void) +{ + char tmp[256]; + strcpy(tmp, "/tmp/xce_ucaf61_nomarker_XXXXXX"); + TEST_ASSERT_NOT_NULL(mkdtemp(tmp)); + + cluster_t *c = t42_make_cluster(tmp); + TEST_ASSERT_NOT_NULL(c); + t42_make_leader(c, /*term*/20, /*n_peers*/1); + TEST_ASSERT_EQUAL_INT(0, + commit_engine_init(&c->commit, &c->persist, 1, 8)); + repl_set_commit_engine(&c->persist.repl, &c->commit); + myconf_t *mc = t43_attach_myconf(c, tmp); + + TEST_ASSERT_EQUAL_INT(0, upgrade_materialization_verify(c)); + TEST_ASSERT_EQUAL_INT(0, upgrade_materialization_fenced(c)); + + t43_free_myconf(c); + commit_engine_fini(&c->commit); + t42_teardown(c); + printf("test_upgrade_materialization_verify_no_marker_clears_fence: PASS\n"); +} + +/* (6.1-b) A committed marker exists and its bytes are locally correct and + * hash-verify, AND this member's own checkpoint has already captured a + * reference to it (task 5's marker-triggered checkpoint runs synchronously + * on apply, so t43_commit_marker's wait-for-applied already guarantees this) + * — materialization is genuinely complete, fence clears. */ +static void test_upgrade_materialization_verify_matching_materialization_clears_fence(void) +{ + char tmp[256]; + strcpy(tmp, "/tmp/xce_ucaf61_match_XXXXXX"); + TEST_ASSERT_NOT_NULL(mkdtemp(tmp)); + + cluster_t *c = t42_make_cluster(tmp); + TEST_ASSERT_NOT_NULL(c); + t42_make_leader(c, /*term*/21, /*n_peers*/1); + TEST_ASSERT_EQUAL_INT(0, + commit_engine_init(&c->commit, &c->persist, 1, 8)); + repl_set_commit_engine(&c->persist.repl, &c->commit); + myconf_t *mc = t43_attach_myconf(c, tmp); + + size_t blen = 0; + uint8_t *bytes = t43_make_config_blob(&blen); + uint8_t sha[32]; + SHA256(bytes, blen, sha); + uint64_t tag; { uint64_t t; memcpy(&t, sha, 8); tag = be64toh(t); } + TEST_ASSERT_EQUAL_INT(0, conf_save_config(mc, bytes, blen, sha)); + free(bytes); + + t43_commit_marker(c, tag, sha); + + /* Task 5's synchronous marker-triggered checkpoint already ran by the + * time t43_commit_marker (which waits for apply) returns — cfgref_* + * already reflects this exact marker. */ + TEST_ASSERT_TRUE(c->persist.cfgref_present); + TEST_ASSERT_EQUAL_HEX64(tag, c->persist.cfgref_tag); + + TEST_ASSERT_EQUAL_INT(0, upgrade_materialization_verify(c)); + TEST_ASSERT_EQUAL_INT(0, upgrade_materialization_fenced(c)); + + t43_free_myconf(c); + commit_engine_fini(&c->commit); + t42_teardown(c); + printf("test_upgrade_materialization_verify_matching_materialization_clears_fence: PASS\n"); +} + +/* (6.1-c) A NEW marker commits while an earlier checkpoint is (simulated) + * still in-flight, so THIS marker's own materialization never actually runs + * (task 5's -EBUSY path, Req 4.4) -- config_committed_marker now returns the + * NEW marker but c->persist.cfgref_* still reflects the OLDER one. + * Materialization is genuinely incomplete for the CURRENT marker -> fence + * SETS (distinct from config_serve_fence, which would stay clear here since + * the bytes for the new marker are already present and correct). */ +static void test_upgrade_materialization_verify_incomplete_materialization_fences(void) +{ + char tmp[256]; + strcpy(tmp, "/tmp/xce_ucaf61_incomplete_XXXXXX"); + TEST_ASSERT_NOT_NULL(mkdtemp(tmp)); + + cluster_t *c = t42_make_cluster(tmp); + TEST_ASSERT_NOT_NULL(c); + t42_make_leader(c, /*term*/22, /*n_peers*/1); + TEST_ASSERT_EQUAL_INT(0, + commit_engine_init(&c->commit, &c->persist, 1, 8)); + repl_set_commit_engine(&c->persist.repl, &c->commit); + myconf_t *mc = t43_attach_myconf(c, tmp); + + /* Marker A: commits, applies, materializes normally (baseline). */ + size_t blenA = 0; + uint8_t *bytesA = t43_make_config_blob(&blenA); + uint8_t shaA[32]; + SHA256(bytesA, blenA, shaA); + uint64_t tagA; { uint64_t t; memcpy(&t, shaA, 8); tagA = be64toh(t); } + TEST_ASSERT_EQUAL_INT(0, conf_save_config(mc, bytesA, blenA, shaA)); + free(bytesA); + t43_commit_marker(c, tagA, shaA); + TEST_ASSERT_EQUAL_INT(0, upgrade_materialization_verify(c)); + TEST_ASSERT_EQUAL_INT(0, upgrade_materialization_fenced(c)); + TEST_ASSERT_EQUAL_HEX64(tagA, c->persist.cfgref_tag); + + /* Marker B: its bytes are saved correctly (config_serve_fence would stay + * clear), but its own checkpoint is forced to skip (-EBUSY) by holding + * the shared checkpoint_in_progress CAS open across the commit -- the + * exact real mechanism task 5's marker-apply case hits under Req 4.4. */ + size_t blenB = 0; + uint8_t *bytesB = t43_make_config_blob(&blenB); + /* t43_make_config_blob always produces byte-identical content -- mutate + * a trailing byte so blob B genuinely differs from blob A (this test + * only ever hashes/saves the raw bytes via upgrade_materialization_verify, + * which never parses them as capnp, so a one-byte mutation is safe). */ + bytesB[blenB - 1] ^= 0xFF; + uint8_t shaB[32]; + SHA256(bytesB, blenB, shaB); + uint64_t tagB; { uint64_t t; memcpy(&t, shaB, 8); tagB = be64toh(t); } + TEST_ASSERT_FALSE(memcmp(shaA, shaB, 32) == 0); + TEST_ASSERT_EQUAL_INT(0, conf_save_config(mc, bytesB, blenB, shaB)); + free(bytesB); + + TEST_ASSERT_EQUAL_INT( + 0, atomic_exchange_explicit(&c->persist.checkpoint_in_progress, 1, + memory_order_acq_rel)); + uint64_t mlsnB = 0; + TEST_ASSERT_EQUAL_INT(0, config_append_marker(c, tagB, shaB, &mlsnB)); + TEST_ASSERT_EQUAL_INT(0, persist_flush(&c->persist)); + TEST_ASSERT_EQUAL_INT(0, + commit_submit(&c->commit, mlsnB, COMMIT_MODE_WAIT, 1000)); + /* apply runs (marker B's WAL_CONFIG_MARKER case fires and hits -EBUSY on + * the still-held CAS -- treated as expected/self-resolving, not a + * failure, so apply itself succeeds); wait for it directly since + * t43_commit_marker's own wait helper is not used here. */ + uint64_t deadline_iters = 200; + while (deadline_iters-- > 0 && + atomic_load_explicit(&c->persist.last_applied_lsn, + memory_order_acquire) < mlsnB) { + struct timespec ts = { .tv_sec = 0, .tv_nsec = 10 * 1000 * 1000 }; + nanosleep(&ts, NULL); + } + TEST_ASSERT_TRUE(atomic_load_explicit(&c->persist.last_applied_lsn, + memory_order_acquire) >= mlsnB); + + /* Release the simulated in-flight checkpoint now that marker B's apply + * (and its -EBUSY'd checkpoint attempt) has already happened. */ + atomic_store_explicit(&c->persist.checkpoint_in_progress, 0, + memory_order_release); + + /* config_committed_marker now authoritatively returns marker B, but this + * member's own materialization never ran for it (cfgref_tag is still A) + * -- genuinely incomplete, not a bytes mismatch. */ + TEST_ASSERT_EQUAL_HEX64(tagA, c->persist.cfgref_tag); + TEST_ASSERT_EQUAL_INT(-EAGAIN, upgrade_materialization_verify(c)); + TEST_ASSERT_EQUAL_INT(1, upgrade_materialization_fenced(c)); + + /* Idempotent retry: calling again while still genuinely unresolved stays + * fenced, does not error/crash/toggle unexpectedly. */ + TEST_ASSERT_EQUAL_INT(-EAGAIN, upgrade_materialization_verify(c)); + TEST_ASSERT_EQUAL_INT(1, upgrade_materialization_fenced(c)); + + t43_free_myconf(c); + commit_engine_fini(&c->commit); + t42_teardown(c); + printf("test_upgrade_materialization_verify_incomplete_materialization_fences: PASS\n"); +} + +/* (6.1-d) Materialization for the current marker DID complete (cfgref_* + * correctly captured it, matching), but the LOCAL config file has since been + * overwritten with different bytes (without a new marker committing) -- + * simulates the exact "stale embedded copy" trap design.md warns about. + * A correct implementation re-reads the LIVE bytes fresh every call rather + * than trusting cfgref_sha (a checkpoint-time reference) -- so this MUST + * fence, proving the fresh re-read actually happens. */ +static void test_upgrade_materialization_verify_stale_local_bytes_after_materialization_fences(void) +{ + char tmp[256]; + strcpy(tmp, "/tmp/xce_ucaf61_stale_XXXXXX"); + TEST_ASSERT_NOT_NULL(mkdtemp(tmp)); + + cluster_t *c = t42_make_cluster(tmp); + TEST_ASSERT_NOT_NULL(c); + t42_make_leader(c, /*term*/23, /*n_peers*/1); + TEST_ASSERT_EQUAL_INT(0, + commit_engine_init(&c->commit, &c->persist, 1, 8)); + repl_set_commit_engine(&c->persist.repl, &c->commit); + myconf_t *mc = t43_attach_myconf(c, tmp); + + size_t blen = 0; + uint8_t *bytes = t43_make_config_blob(&blen); + uint8_t sha[32]; + SHA256(bytes, blen, sha); + uint64_t tag; { uint64_t t; memcpy(&t, sha, 8); tag = be64toh(t); } + TEST_ASSERT_EQUAL_INT(0, conf_save_config(mc, bytes, blen, sha)); + free(bytes); + t43_commit_marker(c, tag, sha); + + TEST_ASSERT_EQUAL_INT(0, upgrade_materialization_verify(c)); + TEST_ASSERT_EQUAL_INT(0, upgrade_materialization_fenced(c)); + + /* The local config file is overwritten with DIFFERENT bytes, without any + * new marker committing (simulates local corruption/drift, or a config + * push that lands out of order) -- config_committed_marker still + * returns the SAME marker/sha as before. */ + size_t blen2 = 0; + uint8_t *bytes2 = t43_make_config_blob(&blen2); + /* t43_make_config_blob always produces byte-identical content -- mutate + * a trailing byte so the "overwritten" bytes genuinely differ. */ + bytes2[blen2 - 1] ^= 0xFF; + uint8_t sha2[32]; + SHA256(bytes2, blen2, sha2); + TEST_ASSERT_FALSE(memcmp(sha, sha2, 32) == 0); + TEST_ASSERT_EQUAL_INT(0, conf_save_config(mc, bytes2, blen2, sha2)); + free(bytes2); + + /* cfgref_sha (captured at checkpoint time) still shows the OLD matching + * value -- a naive implementation trusting it would wrongly stay clear. + * The correct implementation re-reads the file fresh and fences. */ + TEST_ASSERT_EQUAL_HEX64(tag, c->persist.cfgref_tag); + TEST_ASSERT_EQUAL_INT(-EAGAIN, upgrade_materialization_verify(c)); + TEST_ASSERT_EQUAL_INT(1, upgrade_materialization_fenced(c)); + + t43_free_myconf(c); + commit_engine_fini(&c->commit); + t42_teardown(c); + printf("test_upgrade_materialization_verify_stale_local_bytes_after_materialization_fences: PASS\n"); +} + /* (4.3-C) FENCE IS ENFORCED by a production reader: while the config serve-fence * is set, ha_dispatch_gate refuses config-dependent state-changing operations on * the PRIMARY (loud non-serving, member stays alive) and a fenced member is @@ -1400,6 +1704,29 @@ static void test_serve_fence_enforced_by_dispatch_gate_and_promotion(void) TEST_ASSERT_EQUAL_INT(0, config_activate_committed(c)); TEST_ASSERT_EQUAL_INT(0, config_serve_fenced(c)); TEST_ASSERT_EQUAL_HEX64(ttag, mc->config_version_tag); + + /* config-upgrade-snapshot task 6.2 remediation: t43_commit_marker above + * drives the TARGET marker through the REAL apply path, which (as of + * the 6.2 fix) makes apply_committed_entry's WAL_CONFIG_MARKER case + * (persist.c) unconditionally re-evaluate the separate, independent + * upgrade_materialization_fence too -- not just config_serve_fence, + * which is all this test is otherwise about. At that moment the TARGET + * bytes had not arrived locally yet (this test's own deliberate setup, + * to exercise config_serve_fence), so that checkpoint's + * scan_latest_committed_config_ref already stamped cfgref_{tag,sha} + * from the marker itself (materialized-reference present), but the + * live-bytes hash-check genuinely failed (no local bytes yet) -- + * correctly setting upgrade_materialization_fence too, per Req 3.2. + * That is orthogonal, correct behavior, not a bug in either fence, but + * this test never previously accounted for it (the fence was + * unreachable before the 6.2 fix). Re-verify it here now that the + * correct bytes are locally present, mirroring config_activate_ + * committed's own re-verify just above for config_serve_fence, so the + * remaining assertions below exercise only the fence this test is + * actually about. */ + TEST_ASSERT_EQUAL_INT(0, upgrade_materialization_verify(c)); + TEST_ASSERT_EQUAL_INT(0, upgrade_materialization_fenced(c)); + TEST_ASSERT_EQUAL_INT(0, ha_dispatch_gate(&c->ha, OPCode_jobsub)); TEST_ASSERT_EQUAL_INT(0, ha_config_promotion_fenced(&c->ha)); @@ -1423,7 +1750,29 @@ static uint64_t t43_append_marker_uncommitted(cluster_t *c, uint64_t tag, uint64_t mlsn = 0; TEST_ASSERT_EQUAL_INT(0, config_append_marker(c, tag, sha, &mlsn)); TEST_ASSERT_EQUAL_INT(0, persist_flush(&c->persist)); - return mlsn; + + /* config-upgrade-snapshot task 5 finding: config_append_marker's returned + * lsn (via ha_primary_log_append -> raft_log_append's own s->log_len + 1) + * is only reliable when EVERY prior WAL entry on this node went through + * that same raft-tracked append path. A marker-triggered checkpoint (this + * spec) writes its own local-only, never-replicated WAL_CHECKPOINT entry + * directly (persist_write_checkpoint_marker), which advances + * persist_t's current_lsn WITHOUT a corresponding raft_log_append call -- + * this was already possible before this spec (the periodic WAL-threshold + * checkpoint trigger does the same), but this spec's marker-triggered + * checkpoint makes it the COMMON case for any second marker appended + * after an earlier one's checkpoint has already run, exactly this + * fixture's own scenario. The returned mlsn can then under-count the + * entry's TRUE physical position. This does not corrupt commit/durability + * tracking (commit_advance_locked's majority_candidate_locked is driven + * entirely by persist_t's own durable_lsn/current_lsn, never by + * s->log_len -- see commit.c) but it DOES make the returned value + * unreliable for this test's own strict numeric-ordering comparisons. + * Read the TRUE physical lsn directly instead, exactly as production + * code that needs precise positioning (e.g. persist.c's apply seam, + * which receives lsn from the WAL entry's own on-disk header, never from + * this return value) already effectively does. */ + return c->persist.current_lsn - 1; } /* (4.3-D / R7.9) COMMIT-ADVANCE RETRY clears a push-before-commit fence: the @@ -1487,9 +1836,25 @@ static void test_commit_advance_retry_clears_push_before_commit_fence(void) uint64_t tagN; { uint64_t t; memcpy(&t, shaN, 8); tagN = be64toh(t); } TEST_ASSERT_FALSE(memcmp(shaO, shaN, 32) == 0); - /* The NEW marker is APPENDED + flushed to the WAL (local tip advances). */ + /* The NEW marker is APPENDED + flushed to the WAL (local tip advances). + * bug-1469 fix interaction: flushing makes durable_lsn advance, and this + * single-member fixture's commit engine (majority=1) reacts to ANY + * durable advance by racing committed_lsn forward on its OWN background + * fsync-worker thread (commit_on_durable_advance) -- which, since + * apply_committed_entry's WAL_CONFIG_MARKER case now ALSO activates + * config (bug-1469), could apply-and-activate this NEW marker for real + * before this test's own thread gets a chance to pin committed_lsn back + * down below it. PIN IMMEDIATELY, right here, before any other work + * (previously this pin lived after conf_save_config below, leaving a + * multi-syscall window — several real fsyncs — for that background race + * to win against a single-member fixture's over-eager auto-commit, + * something a real multi-node standby never does since its + * committed_lsn is solely driven by the primary's commit-advance, never + * local durability). */ uint64_t new_mlsn = t43_append_marker_uncommitted(c, tagN, shaN); TEST_ASSERT_TRUE(new_mlsn > committed_at_old); + atomic_store_explicit(&c->persist.committed_lsn, committed_at_old, + memory_order_release); /* The OLD config is currently LIVE (activated in upgrade 1). Capture the live * decoded-config pointer as the activation witness: load_primary_config frees @@ -1505,9 +1870,10 @@ static void test_commit_advance_retry_clears_push_before_commit_fence(void) * commit barrier, which would advance committed_lsn to the durable WAL tip, and * it bumps the advertised config_version_tag to tagN (this is the very reason * the primary's config-behind re-push net does not re-fire — Finding D); we - * save FIRST, then PIN committed_lsn back below the NEW marker to model a - * standby whose committed prefix (driven by the primary's commit-advance, not - * local durability) has NOT yet advanced past the NEW marker. */ + * already pinned committed_lsn back below the NEW marker immediately above (to + * model a standby whose committed prefix, driven by the primary's commit- + * advance, not local durability, has NOT yet advanced past the NEW marker) — + * re-pin again here for defense-in-depth against the same race. */ TEST_ASSERT_EQUAL_INT(0, conf_save_config(mc, bytesN, blenN, shaN)); atomic_store_explicit(&c->persist.committed_lsn, committed_at_old, memory_order_release); @@ -1548,6 +1914,1352 @@ static void test_commit_advance_retry_clears_push_before_commit_fence(void) printf("test_commit_advance_retry_clears_push_before_commit_fence: PASS\n"); } +/* ── config-upgrade-snapshot task 6.2: Activation Fence gate composition + + * self-triggering retry (upgrade_materialization_fenced / ha_dispatch_gate / + * raft_cb_become_leader / schedule_upgrade_materialization_retry, ha.c) ──── + * + * These tests reuse this file's own t42_/t43_ fixture helpers and mirror + * the existing (4.3-C/D) config_serve_fence gate-composition/retry tests + * above as the direct template, for the new independent + * upgrade_materialization_fence instead. + */ + +/* raft_cb_become_leader is file-static; drive it through the LIVE-cluster + * XCE_TESTING seam (fix-promotion-standby-registration) so this test proves + * the REAL election-time promotion decision refuses while fenced, not just a + * proxy accessor read. */ +extern void raft_cb_become_leader_with_cluster_for_test(cluster_t *c, + uint64_t term); +/* ha-term-safety task 2.4: drive the WIRED on_commit_advanced callback + * (ha_cb_commit_advanced_stub) so the wiring test below exercises the real + * commit-advance trigger, not a hand-rolled call. */ +extern void ha_cb_commit_advanced_for_test(ha_state_t *ha, + uint64_t commit_index); + +/* (6.2-a) UPGRADE MATERIALIZATION FENCE IS ENFORCED by two production + * readers: (1) ha_dispatch_gate refuses a config-dependent state-changing + * operation on the PRIMARY while fenced (loud non-serving, member stays + * alive) but keeps replication/read-only ops flowing so materialization can + * proceed and re-verify; (2) a REAL election-time promotion attempt + * (raft_cb_become_leader_with_cluster_for_test — the actual gate, not a proxy + * accessor) refuses to become CTRL_PRIMARY while this member's own + * materialization for the current committed marker is incomplete. Regression + * for the dispatch-gate/promotion-gate composition (Req 3.2, 3.3, 4.3, 5.5). + */ +static void test_upgrade_materialization_fence_enforced_by_dispatch_gate_and_promotion(void) +{ + char tmp[256]; + strcpy(tmp, "/tmp/xce_cr62_fence_XXXXXX"); + TEST_ASSERT_NOT_NULL(mkdtemp(tmp)); + + cluster_t *c = t42_make_cluster(tmp); + TEST_ASSERT_NOT_NULL(c); + t42_make_leader(c, /*term*/40, /*n_peers*/1); + TEST_ASSERT_EQUAL_INT(0, + commit_engine_init(&c->commit, &c->persist, 1, 8)); + repl_set_commit_engine(&c->persist.repl, &c->commit); + myconf_t *mc = t43_attach_myconf(c, tmp); + + /* Commit a marker but never checkpoint against it -- this member's own + * materialization is genuinely incomplete for it (identical setup to + * test_upgrade_materialization_verify_matching_materialization_clears_fence's + * sibling incomplete-materialization test, just without the -EBUSY + * choreography -- a fresh marker with no checkpoint yet run is already + * incomplete by construction). */ + size_t blen = 0; + uint8_t *bytes = t43_make_config_blob(&blen); + uint8_t sha[32]; + SHA256(bytes, blen, sha); + uint64_t tag; { uint64_t t; memcpy(&t, sha, 8); tag = be64toh(t); } + TEST_ASSERT_EQUAL_INT(0, conf_save_config(mc, bytes, blen, sha)); + free(bytes); + + /* Force materialization to stay incomplete for THIS marker: hold the + * shared checkpoint_in_progress CAS open across the commit (the same + * mechanism test_upgrade_materialization_verify_incomplete_materialization_ + * fences uses), so the marker-apply checkpoint hits -EBUSY and cfgref_* + * never advances to it. */ + TEST_ASSERT_EQUAL_INT( + 0, atomic_exchange_explicit(&c->persist.checkpoint_in_progress, 1, + memory_order_acq_rel)); + uint64_t mlsn = 0; + TEST_ASSERT_EQUAL_INT(0, config_append_marker(c, tag, sha, &mlsn)); + TEST_ASSERT_EQUAL_INT(0, persist_flush(&c->persist)); + TEST_ASSERT_EQUAL_INT(0, + commit_submit(&c->commit, mlsn, COMMIT_MODE_WAIT, 1000)); + uint64_t deadline_iters = 200; + while (deadline_iters-- > 0 && + atomic_load_explicit(&c->persist.last_applied_lsn, + memory_order_acquire) < mlsn) { + struct timespec ts = { .tv_sec = 0, .tv_nsec = 10 * 1000 * 1000 }; + nanosleep(&ts, NULL); + } + atomic_store_explicit(&c->persist.checkpoint_in_progress, 0, + memory_order_release); + + TEST_ASSERT_EQUAL_INT(-EAGAIN, upgrade_materialization_verify(c)); + TEST_ASSERT_EQUAL_INT(1, upgrade_materialization_fenced(c)); + + /* PRODUCTION READER 1: ha_dispatch_gate refuses a state-changing op on + * the fenced PRIMARY but stays alive (error, not crash/exit). */ + TEST_ASSERT_TRUE(ha_dispatch_gate(&c->ha, OPCode_jobsub) < 0); + /* Replication / read-only ops still pass. */ + TEST_ASSERT_EQUAL_INT(0, ha_dispatch_gate(&c->ha, OPCode_heartbeat)); + TEST_ASSERT_EQUAL_INT(0, ha_dispatch_gate(&c->ha, OPCode_get)); + + /* PRODUCTION READER 2: a real election-time promotion attempt refuses to + * become CTRL_PRIMARY while fenced. ha_primary_log_append above only + * required c->ha.raft.role == RAFT_LEADER (set by t42_make_leader), not + * ha->role == CTRL_PRIMARY, so resetting ha->role to CTRL_ELECTING here + * to observe a genuine promotion decision does not disturb the marker + * already committed above. */ + c->ha.phase2_done = 1; /* skip cluster_init_phase2 -- unrelated first-boot path */ + atomic_store_explicit(&c->ha.role, (int32_t)CTRL_ELECTING, + memory_order_release); + raft_cb_become_leader_with_cluster_for_test(c, /*term*/40); + TEST_ASSERT_NOT_EQUAL_MESSAGE( + (int32_t)CTRL_PRIMARY, + atomic_load_explicit(&c->ha.role, memory_order_acquire), + "config-upgrade-snapshot task 6.2 (Req 3.2/3.3/4.3/5.5): a member " + "whose own upgrade-snapshot materialization is incomplete must NOT " + "be promoted to CTRL_PRIMARY"); + TEST_ASSERT_EQUAL_INT(1, upgrade_materialization_fenced(c)); /* unaffected */ + + t43_free_myconf(c); + commit_engine_fini(&c->commit); + t42_teardown(c); + printf("test_upgrade_materialization_fence_enforced_by_dispatch_gate_and_promotion: PASS\n"); +} + +/* (6.2-b) schedule_upgrade_materialization_retry is a no-op when NOT fenced + * -- steady state schedules nothing (no busy-spin), mirroring + * config_schedule_activate_retry's own documented no-op behavior. */ +static void test_schedule_upgrade_materialization_retry_noop_when_not_fenced(void) +{ + char tmp[256]; + strcpy(tmp, "/tmp/xce_cr62_retry_noop_unfenced_XXXXXX"); + TEST_ASSERT_NOT_NULL(mkdtemp(tmp)); + + cluster_t *c = t42_make_cluster(tmp); + TEST_ASSERT_NOT_NULL(c); + t42_make_leader(c, /*term*/41, /*n_peers*/1); + + TEST_ASSERT_EQUAL_INT(0, upgrade_materialization_fenced(c)); /* fixture default: unfenced */ + TEST_ASSERT_FALSE(c->delaymgr.running); /* fixture never starts delaymgr */ + + TEST_ASSERT_EQUAL_INT(0, schedule_upgrade_materialization_retry(c)); + + t42_teardown(c); + printf("test_schedule_upgrade_materialization_retry_noop_when_not_fenced: PASS\n"); +} + +/* (6.2-c) schedule_upgrade_materialization_retry is a no-op when the + * delaymgr is not running, even while fenced -- the unit-test fixture path + * (mirrors config_schedule_activate_retry's own documented delaymgr-not- + * running no-op; test_commit_advance_retry_clears_push_before_commit_fence + * relies on this same fixture property to drive its retry entry directly). */ +static void test_schedule_upgrade_materialization_retry_noop_when_delaymgr_not_running(void) +{ + char tmp[256]; + strcpy(tmp, "/tmp/xce_cr62_retry_noop_nodmgr_XXXXXX"); + TEST_ASSERT_NOT_NULL(mkdtemp(tmp)); + + cluster_t *c = t42_make_cluster(tmp); + TEST_ASSERT_NOT_NULL(c); + t42_make_leader(c, /*term*/42, /*n_peers*/1); + TEST_ASSERT_EQUAL_INT(0, + commit_engine_init(&c->commit, &c->persist, 1, 8)); + repl_set_commit_engine(&c->persist.repl, &c->commit); + myconf_t *mc = t43_attach_myconf(c, tmp); + + size_t blen = 0; + uint8_t *bytes = t43_make_config_blob(&blen); + uint8_t sha[32]; + SHA256(bytes, blen, sha); + uint64_t tag; { uint64_t t; memcpy(&t, sha, 8); tag = be64toh(t); } + TEST_ASSERT_EQUAL_INT(0, conf_save_config(mc, bytes, blen, sha)); + free(bytes); + t43_commit_marker(c, tag, sha); + + /* Overwrite the local bytes without a new marker committing -- the same + * "stale local bytes" fence trigger + * test_upgrade_materialization_verify_stale_local_bytes_after_ + * materialization_fences uses -- so the fence is genuinely SET without + * needing the -EBUSY checkpoint choreography. */ + size_t blen2 = 0; + uint8_t *bytes2 = t43_make_config_blob(&blen2); + bytes2[blen2 - 1] ^= 0xFF; + uint8_t sha2[32]; + SHA256(bytes2, blen2, sha2); + TEST_ASSERT_EQUAL_INT(0, conf_save_config(mc, bytes2, blen2, sha2)); + free(bytes2); + + TEST_ASSERT_EQUAL_INT(-EAGAIN, upgrade_materialization_verify(c)); + TEST_ASSERT_EQUAL_INT(1, upgrade_materialization_fenced(c)); + TEST_ASSERT_FALSE(c->delaymgr.running); + + /* delaymgr not running -- no-op, returns 0, does not crash/leak a task. */ + TEST_ASSERT_EQUAL_INT(0, schedule_upgrade_materialization_retry(c)); + TEST_ASSERT_EQUAL_INT(1, upgrade_materialization_fenced(c)); /* still fenced -- untouched */ + + t43_free_myconf(c); + commit_engine_fini(&c->commit); + t42_teardown(c); + printf("test_schedule_upgrade_materialization_retry_noop_when_delaymgr_not_running: PASS\n"); +} + +/* (6.2-d) upgrade_materialization_retry_fn -- the same off-thread entry + * point schedule_upgrade_materialization_retry's trampoline would enqueue in + * production -- stays fenced (-EAGAIN) while the genuine mismatch persists, + * then CLEARS the fence once the live bytes are corrected to match the + * committed marker, without a new marker needing to commit. Mirrors + * config_activate_retry_fn's own direct-drive regression + * (test_commit_advance_retry_clears_push_before_commit_fence). */ +static void test_upgrade_materialization_retry_fn_recovers_from_stale_bytes_fence(void) +{ + char tmp[256]; + strcpy(tmp, "/tmp/xce_cr62_retry_fn_XXXXXX"); + TEST_ASSERT_NOT_NULL(mkdtemp(tmp)); + + cluster_t *c = t42_make_cluster(tmp); + TEST_ASSERT_NOT_NULL(c); + t42_make_leader(c, /*term*/43, /*n_peers*/1); + TEST_ASSERT_EQUAL_INT(0, + commit_engine_init(&c->commit, &c->persist, 1, 8)); + repl_set_commit_engine(&c->persist.repl, &c->commit); + myconf_t *mc = t43_attach_myconf(c, tmp); + + size_t blen = 0; + uint8_t *bytes = t43_make_config_blob(&blen); + uint8_t sha[32]; + SHA256(bytes, blen, sha); + uint64_t tag; { uint64_t t; memcpy(&t, sha, 8); tag = be64toh(t); } + TEST_ASSERT_EQUAL_INT(0, conf_save_config(mc, bytes, blen, sha)); + t43_commit_marker(c, tag, sha); + TEST_ASSERT_EQUAL_INT(0, upgrade_materialization_verify(c)); + TEST_ASSERT_EQUAL_INT(0, upgrade_materialization_fenced(c)); + + /* Local bytes are overwritten with DIFFERENT content, without a new + * marker committing -- cfgref_* still shows the old matching reference, + * but a fresh live re-read must fence (same trap 6.1-d proves for + * upgrade_materialization_verify itself). */ + size_t blenX = 0; + uint8_t *bytesX = t43_make_config_blob(&blenX); + bytesX[blenX - 1] ^= 0xA5; + uint8_t shaX[32]; + SHA256(bytesX, blenX, shaX); + TEST_ASSERT_FALSE(memcmp(sha, shaX, 32) == 0); + TEST_ASSERT_EQUAL_INT(0, conf_save_config(mc, bytesX, blenX, shaX)); + free(bytesX); + TEST_ASSERT_EQUAL_INT(-EAGAIN, upgrade_materialization_verify(c)); + TEST_ASSERT_EQUAL_INT(1, upgrade_materialization_fenced(c)); + + /* Drive the retry entry directly while the mismatch is still genuine: + * stays fenced, does not crash/toggle incorrectly. */ + TEST_ASSERT_EQUAL_INT(-EAGAIN, upgrade_materialization_retry_fn(c)); + TEST_ASSERT_EQUAL_INT(1, upgrade_materialization_fenced(c)); + + /* Restore the CORRECT bytes (matching the still-current committed + * marker) without any new marker commit -- models the out-of-band + * config-push bytes finally arriving/correcting. */ + TEST_ASSERT_EQUAL_INT(0, conf_save_config(mc, bytes, blen, sha)); + free(bytes); + + /* Drive the retry entry again: re-verify now succeeds -- fence CLEARS. */ + TEST_ASSERT_EQUAL_INT(0, upgrade_materialization_retry_fn(c)); + TEST_ASSERT_EQUAL_INT(0, upgrade_materialization_fenced(c)); + + t43_free_myconf(c); + commit_engine_fini(&c->commit); + t42_teardown(c); + printf("test_upgrade_materialization_retry_fn_recovers_from_stale_bytes_fence: PASS\n"); +} + +/* (6.2-e) WIRING: the commit-advance path (ha_cb_commit_advanced_stub, the + * WIRED on_commit_advanced callback) consults upgrade_materialization_fenced + * and calls schedule_upgrade_materialization_retry when fenced -- driven + * through the REAL wired callback (ha_cb_commit_advanced_for_test), not a + * hand-rolled call, so this proves the actual call-site wiring executes + * without crashing/corrupting state. schedule_upgrade_materialization_retry + * itself is a no-op in this fixture (delaymgr not running -- proven in + * isolation by 6.2-c above), so the fence is expected to remain SET + * afterward; this test's contribution is exercising the NEW branch at the + * real call site itself, not re-proving the no-op contract. */ +static void test_commit_advance_wiring_calls_upgrade_materialization_schedule_retry(void) +{ + char tmp[256]; + strcpy(tmp, "/tmp/xce_cr62_wiring_XXXXXX"); + TEST_ASSERT_NOT_NULL(mkdtemp(tmp)); + + cluster_t *c = t42_make_cluster(tmp); + TEST_ASSERT_NOT_NULL(c); + t42_make_leader(c, /*term*/44, /*n_peers*/1); + TEST_ASSERT_EQUAL_INT(0, + commit_engine_init(&c->commit, &c->persist, 1, 8)); + repl_set_commit_engine(&c->persist.repl, &c->commit); + myconf_t *mc = t43_attach_myconf(c, tmp); + + size_t blen = 0; + uint8_t *bytes = t43_make_config_blob(&blen); + uint8_t sha[32]; + SHA256(bytes, blen, sha); + uint64_t tag; { uint64_t t; memcpy(&t, sha, 8); tag = be64toh(t); } + TEST_ASSERT_EQUAL_INT(0, conf_save_config(mc, bytes, blen, sha)); + free(bytes); + t43_commit_marker(c, tag, sha); + TEST_ASSERT_EQUAL_INT(0, upgrade_materialization_verify(c)); + TEST_ASSERT_EQUAL_INT(0, upgrade_materialization_fenced(c)); + + /* Overwrite local bytes (stale-bytes trigger, same as 6.2-c) to fence + * without a new marker. */ + size_t blen2 = 0; + uint8_t *bytes2 = t43_make_config_blob(&blen2); + bytes2[blen2 - 1] ^= 0xFF; + uint8_t sha2[32]; + SHA256(bytes2, blen2, sha2); + TEST_ASSERT_EQUAL_INT(0, conf_save_config(mc, bytes2, blen2, sha2)); + free(bytes2); + TEST_ASSERT_EQUAL_INT(-EAGAIN, upgrade_materialization_verify(c)); + TEST_ASSERT_EQUAL_INT(1, upgrade_materialization_fenced(c)); + + uint64_t committed_lsn = + atomic_load_explicit(&c->persist.committed_lsn, memory_order_acquire); + + /* Drive the REAL wired commit-advance callback -- must not crash, must + * not corrupt the fence state (schedule_upgrade_materialization_retry's + * own no-op-when-delaymgr-not-running contract keeps it SET). */ + ha_cb_commit_advanced_for_test(&c->ha, committed_lsn); + TEST_ASSERT_EQUAL_INT(1, upgrade_materialization_fenced(c)); + + t43_free_myconf(c); + commit_engine_fini(&c->commit); + t42_teardown(c); + printf("test_commit_advance_wiring_calls_upgrade_materialization_schedule_retry: PASS\n"); +} + +/* ── bug-1477: ha_phase2_retry_fn / ha_schedule_phase2_retry ───────────────── + * + * A node that takes myapp_run's skip_election passive path (bug-849 -- + * "leader already known after the startup stagger") makes exactly ONE + * cluster_init_phase2 attempt. Before this fix, EVERY call site (myapp.c's + * skip_election block, raft_cb_become_leader, raft_cb_become_follower, + * ha_elect_evaluate_and_signal's two branches) latched ha->phase2_done = 1 + * UNCONDITIONALLY, regardless of cluster_init_phase2's return value. If that + * one attempt raced config availability and failed, the node was left + * permanently stuck: commit_engine_init never ran, so apply_committed_entry + * never applied ANY committed WAL entry for the rest of that process's + * lifetime -- and since a skip_election node never again contests an + * election, none of the other four call sites, which only fire via THIS + * node's own raft-library state transitions, ever ran again either. + * + * ha_phase2_retry_fn is the idempotent retry entry (mirrors + * upgrade_materialization_retry_fn's shape); ha_schedule_phase2_retry is its + * delaymgr-scheduled, self-limiting trigger (mirrors + * schedule_upgrade_materialization_retry's no-op guards). */ + +/* (bug-1477-a) ha_phase2_retry_fn is a no-op once phase2_done is already + * set -- does not re-invoke the hook, returns 0. */ +static void test_ha_phase2_retry_fn_noop_when_already_done(void) +{ + char tmp[256]; + strcpy(tmp, "/tmp/xce_cr1477_retry_noop_done_XXXXXX"); + TEST_ASSERT_NOT_NULL(mkdtemp(tmp)); + + cluster_t *c = t42_make_cluster(tmp); + TEST_ASSERT_NOT_NULL(c); + c->ha.phase2_done = 1; + + TEST_ASSERT_EQUAL_INT(0, ha_phase2_retry_fn(c)); + TEST_ASSERT_EQUAL_INT(1, c->ha.phase2_done); + + t42_teardown(c); + printf("test_ha_phase2_retry_fn_noop_when_already_done: PASS\n"); +} + +static _Atomic int g_cr1477_hook_calls; +static _Atomic int g_cr1477_hook_fail_first_n; + +/* Fails the first g_cr1477_hook_fail_first_n calls (rc=-EAGAIN), succeeds + * (rc=0) thereafter -- models cluster_init_phase2 racing config + * availability and then succeeding once it arrives. */ +static int cr1477_flaky_phase2_hook(void *c) +{ + (void)c; + int n = atomic_fetch_add(&g_cr1477_hook_calls, 1); + return (n < atomic_load(&g_cr1477_hook_fail_first_n)) ? -EAGAIN : 0; +} + +/* (bug-1477-b) THE CORE REGRESSION: a failed cluster_init_phase2 attempt + * must NOT latch phase2_done -- RED under the pre-fix code (which set + * phase2_done = 1 unconditionally right after calling the hook, regardless + * of its return value; this assertion would fail immediately). A second + * call, once the underlying condition clears, then succeeds and latches. */ +static void test_ha_phase2_retry_fn_does_not_latch_on_failure_and_succeeds_on_retry(void) +{ + char tmp[256]; + strcpy(tmp, "/tmp/xce_cr1477_retry_fn_XXXXXX"); + TEST_ASSERT_NOT_NULL(mkdtemp(tmp)); + + cluster_t *c = t42_make_cluster(tmp); + TEST_ASSERT_NOT_NULL(c); + TEST_ASSERT_EQUAL_INT(0, c->ha.phase2_done); /* fixture default: not done */ + + atomic_store(&g_cr1477_hook_calls, 0); + atomic_store(&g_cr1477_hook_fail_first_n, 1); + ha_phase2_hook = cr1477_flaky_phase2_hook; + + /* First attempt: hook fails -- phase2_done must stay 0 (bug-1477's own + * regression assertion). */ + TEST_ASSERT_EQUAL_INT(-EAGAIN, ha_phase2_retry_fn(c)); + TEST_ASSERT_EQUAL_INT_MESSAGE(0, c->ha.phase2_done, + "a failed cluster_init_phase2 attempt must not latch phase2_done " + "(bug-1477 -- the pre-fix code did this unconditionally, " + "permanently stranding the member)"); + + /* Second attempt: hook now succeeds -- phase2_done latches. */ + TEST_ASSERT_EQUAL_INT(0, ha_phase2_retry_fn(c)); + TEST_ASSERT_EQUAL_INT(1, c->ha.phase2_done); + + /* Idempotent: a third call is a pure no-op (hook not re-invoked). */ + int calls_before = atomic_load(&g_cr1477_hook_calls); + TEST_ASSERT_EQUAL_INT(0, ha_phase2_retry_fn(c)); + TEST_ASSERT_EQUAL_INT(calls_before, atomic_load(&g_cr1477_hook_calls)); + + ha_phase2_hook = NULL; /* restore -- shared process-global test seam */ + t42_teardown(c); + printf("test_ha_phase2_retry_fn_does_not_latch_on_failure_and_succeeds_on_retry: PASS\n"); +} + +/* (bug-1477-c) ha_schedule_phase2_retry is a no-op when phase2_done is + * already set -- steady state schedules nothing (no busy-spin), mirroring + * schedule_upgrade_materialization_retry's own documented no-op behavior. */ +static void test_schedule_phase2_retry_noop_when_already_done(void) +{ + char tmp[256]; + strcpy(tmp, "/tmp/xce_cr1477_sched_noop_done_XXXXXX"); + TEST_ASSERT_NOT_NULL(mkdtemp(tmp)); + + cluster_t *c = t42_make_cluster(tmp); + TEST_ASSERT_NOT_NULL(c); + c->ha.phase2_done = 1; + TEST_ASSERT_FALSE(c->delaymgr.running); /* fixture never starts delaymgr */ + + TEST_ASSERT_EQUAL_INT(0, ha_schedule_phase2_retry(c)); + + t42_teardown(c); + printf("test_schedule_phase2_retry_noop_when_already_done: PASS\n"); +} + +/* (bug-1477-d) ha_schedule_phase2_retry is a no-op when the delaymgr is not + * running, even while phase2_done is still 0 -- the unit-test fixture path + * (mirrors config_schedule_activate_retry / schedule_upgrade_materialization_ + * retry's own documented delaymgr-not-running no-op). */ +static void test_schedule_phase2_retry_noop_when_delaymgr_not_running(void) +{ + char tmp[256]; + strcpy(tmp, "/tmp/xce_cr1477_sched_noop_nodmgr_XXXXXX"); + TEST_ASSERT_NOT_NULL(mkdtemp(tmp)); + + cluster_t *c = t42_make_cluster(tmp); + TEST_ASSERT_NOT_NULL(c); + TEST_ASSERT_EQUAL_INT(0, c->ha.phase2_done); + TEST_ASSERT_FALSE(c->delaymgr.running); + + TEST_ASSERT_EQUAL_INT(0, ha_schedule_phase2_retry(c)); + TEST_ASSERT_EQUAL_INT(0, c->ha.phase2_done); /* untouched -- no-op */ + + t42_teardown(c); + printf("test_schedule_phase2_retry_noop_when_delaymgr_not_running: PASS\n"); +} + +/* ── config-upgrade-snapshot task 6.2 remediation: Activation Fence set by a + * REAL production trigger, not a direct test call ────────────────────────── + * + * Every test above (6.2-a..e, and 6.1's own 4 tests earlier in this file) + * reaches the fenced state by calling upgrade_materialization_verify() + * directly in the test body. That proves the fence's own logic is correct, + * but NOT that a running production controller can ever reach the fenced + * state in the first place: every PRODUCTION call path to + * upgrade_materialization_verify() -- upgrade_materialization_retry_fn, and + * both of ITS callers (schedule_upgrade_materialization_retry and the + * commit-advance hook in ha_cb_commit_advanced_stub) -- is itself gated on + * upgrade_materialization_fenced() already being true. Starting from the + * fence's zero-initialized (unfenced) default, that is a closed loop with + * no entry point: nothing in production could ever set the fence for the + * first time, which made the dispatch-gate/promotion-gate checks in 6.2-a + * permanently dead code against a real controller. + * + * The actual fix (persist.c's apply_committed_entry, WAL_CONFIG_MARKER + * case) calls upgrade_materialization_verify() UNCONDITIONALLY right after + * persist_checkpoint_marker_triggered() returns, regardless of that call's + * own rc -- checkpoint completion (or a self-resolving skip) is the + * design-intended re-evaluation trigger (design.md's Activation Fence + * component). This test reaches the fenced state purely through that real + * seam -- config_append_marker + commit_submit + wait-for-applied, with + * persist_checkpoint_marker_triggered() forced to miss via the exact + * checkpoint_in_progress technique test_upgrade_materialization_verify_ + * incomplete_materialization_fences (6.1-c) and test_upgrade_materialization + * _fence_enforced_by_dispatch_gate_and_promotion (6.2-a) use -- and NEVER + * calls upgrade_materialization_verify() itself. */ +static void test_wal_config_marker_apply_sets_fence_via_real_checkpoint_miss(void) +{ + char tmp[256]; + strcpy(tmp, "/tmp/xce_cr62_real_trigger_XXXXXX"); + TEST_ASSERT_NOT_NULL(mkdtemp(tmp)); + + cluster_t *c = t42_make_cluster(tmp); + TEST_ASSERT_NOT_NULL(c); + t42_make_leader(c, /*term*/45, /*n_peers*/1); + TEST_ASSERT_EQUAL_INT(0, + commit_engine_init(&c->commit, &c->persist, 1, 8)); + repl_set_commit_engine(&c->persist.repl, &c->commit); + myconf_t *mc = t43_attach_myconf(c, tmp); + + /* Fixture default: unfenced (fresh cluster_t, zero-initialized atomic) + * -- the exact "closed loop, no entry point" starting condition the + * rejection identified. This test body never calls + * upgrade_materialization_verify() anywhere below -- the fence must be + * set purely by the real apply-time trigger. */ + TEST_ASSERT_EQUAL_INT(0, upgrade_materialization_fenced(c)); + + size_t blen = 0; + uint8_t *bytes = t43_make_config_blob(&blen); + uint8_t sha[32]; + SHA256(bytes, blen, sha); + uint64_t tag; { uint64_t t; memcpy(&t, sha, 8); tag = be64toh(t); } + TEST_ASSERT_EQUAL_INT(0, conf_save_config(mc, bytes, blen, sha)); + free(bytes); + + /* Force materialization to genuinely miss for THIS marker: hold the + * shared checkpoint_in_progress CAS open across the commit, so + * persist_checkpoint_marker_triggered() (called from + * apply_committed_entry's WAL_CONFIG_MARKER case) hits the real -EBUSY + * path (Req 4.4) -- self-resolving, not a failure, so apply itself + * still succeeds and last_applied_lsn still advances. */ + TEST_ASSERT_EQUAL_INT( + 0, atomic_exchange_explicit(&c->persist.checkpoint_in_progress, 1, + memory_order_acq_rel)); + uint64_t mlsn = 0; + TEST_ASSERT_EQUAL_INT(0, config_append_marker(c, tag, sha, &mlsn)); + TEST_ASSERT_EQUAL_INT(0, persist_flush(&c->persist)); + TEST_ASSERT_EQUAL_INT(0, + commit_submit(&c->commit, mlsn, COMMIT_MODE_WAIT, 1000)); + + /* Wait for the REAL apply_committed_entry() dispatch to finish for this + * marker. persist_apply_pump_run advances last_applied_lsn only AFTER + * that dispatch call returns (see apply_committed_entry's own + * WAL_CONFIG_MARKER case doc comment), so by the time + * t42_wait_applied observes last_applied_lsn >= mlsn, the new + * unconditional upgrade_materialization_verify(c) call at the end of + * that case has already run synchronously on this same call stack. */ + t42_wait_applied(&c->persist, mlsn, 2000); + TEST_ASSERT_TRUE(persist_last_applied_lsn(&c->persist) >= mlsn); + + /* Release the simulated in-flight checkpoint now that the marker's own + * apply (and its -EBUSY'd checkpoint attempt) has already happened. */ + atomic_store_explicit(&c->persist.checkpoint_in_progress, 0, + memory_order_release); + + /* THE ASSERTION THAT PROVES THE FIX: the fence reads SET, and this test + * body never called upgrade_materialization_verify() itself -- the only + * possible source is persist.c's new unconditional post-checkpoint + * call. Before the fix, this read 0 forever: every production path to + * upgrade_materialization_verify() was gated on the fence already being + * 1, so nothing could ever set it for the first time. */ + TEST_ASSERT_EQUAL_INT(1, upgrade_materialization_fenced(c)); + /* Confirm this is a genuine incomplete-materialization fence (cfgref_* + * never advanced to this marker, because the checkpoint that would have + * stamped it was skipped) -- not a coincidental pass. */ + TEST_ASSERT_FALSE(c->persist.cfgref_present && + c->persist.cfgref_tag == tag && + memcmp(c->persist.cfgref_sha, sha, 32) == 0); + + /* Close the loop end-to-end: the two production READERS of this fence + * (ha_dispatch_gate and the promotion gate) both observe it too, using + * the same real seams 6.2-a exercises -- reusing existing test + * infrastructure, not re-deriving it. */ + TEST_ASSERT_TRUE(ha_dispatch_gate(&c->ha, OPCode_jobsub) < 0); + TEST_ASSERT_EQUAL_INT(0, ha_dispatch_gate(&c->ha, OPCode_heartbeat)); + + c->ha.phase2_done = 1; /* skip cluster_init_phase2 -- unrelated first-boot path */ + atomic_store_explicit(&c->ha.role, (int32_t)CTRL_ELECTING, + memory_order_release); + raft_cb_become_leader_with_cluster_for_test(c, /*term*/45); + TEST_ASSERT_NOT_EQUAL_MESSAGE( + (int32_t)CTRL_PRIMARY, + atomic_load_explicit(&c->ha.role, memory_order_acquire), + "config-upgrade-snapshot task 6.2 remediation: a fence set by the " + "REAL apply-time trigger must refuse promotion, same as a " + "directly-set fence does"); + + t43_free_myconf(c); + commit_engine_fini(&c->commit); + t42_teardown(c); + printf("test_wal_config_marker_apply_sets_fence_via_real_checkpoint_miss: PASS\n"); +} + +/* ── bug-1469 regression: WAL_CONFIG_MARKER apply must ACTIVATE config on + * the ORIGINATING member, not just receiving standbys ────────────────────── + * + * Live 3-node chaotic-kill soak (config-upgrade-snapshot task 8.6, + * .wolf/buglog.json bug-1469): a config upgrade's WAL_CONFIG_MARKER commits + * and even checkpoints successfully on the ORIGINATING member (the primary + * that submitted the upgrade via do_upgrade_config_with_bytes), but + * apply_committed_entry's WAL_CONFIG_MARKER case (persist.c) never called + * config_activate_committed()/load_primary_config() -- so that member's + * c->myconf stayed parsed from the OLD config bytes until some LATER, + * independent event (a restart, or an incoming out-of-band + * handle_repl_config_push) happened to refresh it. The live soak killed the + * originating primary shortly after it committed the upgrade, before any + * such later event, freezing a stale c->myconf into its last checkpoint -- + * a genuine cross-member materialized-state divergence (ctrl-1's checkpoint + * ended up a different byte size than ctrl-2/ctrl-3's, both LSN 11). + * config_activate_committed WAS already being called correctly on + * RECEIVING standbys, via handle_repl_config_push -- this gap is specific + * to the member that originates/commits the marker on itself. + */ + +/* Build a valid ClusterConfig blob distinguishable by config_generation + + * clustername (mirrors t43_make_config_blob, parameterized so this test can + * commit two genuinely different, independently-decodable configs -- an + * "old" pre-upgrade config and a "new" post-upgrade config -- without + * relying on a byte-mutation of an opaque capnp blob, which risks + * corrupting the encoding; config-upgrade-snapshot's own standing gotcha + * notes t43_make_config_blob() returns byte-IDENTICAL content on repeat + * calls, so a genuinely different SECOND blob needs its own encode call). */ +static uint8_t *t1469_make_config_blob(uint64_t gen, const char *name, + size_t *len_out) +{ + cluster_config_t cfg; + struct capn cap; + struct capn_segment *cs; + ClusterConfig_ptr p; + uint8_t *buf; + size_t sz; + + memset(&cfg, 0, sizeof(cfg)); + cfg.clustername = (char *)name; + cfg.config_generation = gen; + + capn_init_malloc(&cap); + cs = capn_root(&cap).seg; + encode_ClusterConfig_ptr(cs, &p, &cfg); + capn_setp(capn_root(&cap), 0, p.p); + sz = (size_t)capn_size(&cap); + buf = (uint8_t *)malloc(sz); + TEST_ASSERT_NOT_NULL(buf); + capn_write_mem(&cap, buf, sz, 0); + capn_free(&cap); + *len_out = sz; + return buf; +} + +/* This test drives the upgrade marker through the REAL production apply + * path (config_append_marker + commit_submit + wait-for-applied, exactly + * like test_wal_config_marker_apply_sets_fence_via_real_checkpoint_miss + * above) on a single-member fixture acting as its OWN primary -- i.e. the + * ORIGINATING member applying its own committed marker, never receiving an + * out-of-band handle_repl_config_push. It NEVER calls + * config_activate_committed() for the upgrade marker itself, so the only + * way mc->cluster_config can reflect the new config is via + * apply_committed_entry's own WAL_CONFIG_MARKER dispatch. + * + * RED (before the fix): mc->cluster_config stays pinned to the OLD config + * (config_generation==1, "t1469-old") after the new marker's real, + * successful commit+apply -- proving the marker-triggered dispatch never + * activates config on the member that originated it. + * GREEN (after the fix): mc->cluster_config reflects the NEW config + * (config_generation==2, "t1469-new") immediately after the marker's apply + * returns, with no restart and no out-of-band push. */ +static void test_wal_config_marker_apply_activates_originating_member_config(void) +{ + char tmp[256]; + strcpy(tmp, "/tmp/xce_cr1469_activate_XXXXXX"); + TEST_ASSERT_NOT_NULL(mkdtemp(tmp)); + + cluster_t *c = t42_make_cluster(tmp); + TEST_ASSERT_NOT_NULL(c); + t42_make_leader(c, /*term*/69, /*n_peers*/1); + TEST_ASSERT_EQUAL_INT(0, + commit_engine_init(&c->commit, &c->persist, 1, 8)); + repl_set_commit_engine(&c->persist.repl, &c->commit); + myconf_t *mc = t43_attach_myconf(c, tmp); + + /* Establish the pre-upgrade steady state: an OLD config already + * committed and ACTIVATED via the legitimate, already-tested + * config_activate_committed path (mirrors 4.3-a above) -- this member + * is already running under config_generation=1 before any upgrade is + * ever submitted, exactly like a real cluster member. */ + size_t oldlen = 0; + uint8_t *oldbytes = t1469_make_config_blob(1, "t1469-old", &oldlen); + uint8_t oldsha[32]; + SHA256(oldbytes, oldlen, oldsha); + uint64_t oldtag; { uint64_t t; memcpy(&t, oldsha, 8); oldtag = be64toh(t); } + TEST_ASSERT_EQUAL_INT(0, conf_save_config(mc, oldbytes, oldlen, oldsha)); + free(oldbytes); + t43_commit_marker(c, oldtag, oldsha); + TEST_ASSERT_EQUAL_INT(0, config_activate_committed(c)); + TEST_ASSERT_NOT_NULL(mc->cluster_config); + TEST_ASSERT_EQUAL_UINT64(1, mc->cluster_config->config_generation); + + /* Now the upgrade: NEW config bytes saved locally exactly as + * do_upgrade_config_with_bytes's own step 5 (conf_save_config) does on + * the ORIGINATING primary, then a NEW marker committed through the + * exact same real path bug-1469's live soak exercised. Deliberately + * NEVER calls config_activate_committed() for this marker anywhere + * below -- activation must come from apply_committed_entry's own + * dispatch, or this assertion fails. */ + size_t newlen = 0; + uint8_t *newbytes = t1469_make_config_blob(2, "t1469-new", &newlen); + uint8_t newsha[32]; + SHA256(newbytes, newlen, newsha); + uint64_t newtag; { uint64_t t; memcpy(&t, newsha, 8); newtag = be64toh(t); } + TEST_ASSERT_EQUAL_INT(0, conf_save_config(mc, newbytes, newlen, newsha)); + free(newbytes); + t43_commit_marker(c, newtag, newsha); + + /* THE ASSERTION THAT PROVES THE FIX: mc->cluster_config must now + * reflect the NEW config -- purely from apply_committed_entry's own + * WAL_CONFIG_MARKER dispatch, exactly the production path the + * ORIGINATING primary runs on itself. Before the fix this stays pinned + * at generation 1 ("t1469-old") forever -- exactly bug-1469's observed + * cross-member divergence, reproduced at the unit level. */ + TEST_ASSERT_NOT_NULL(mc->cluster_config); + TEST_ASSERT_EQUAL_UINT64_MESSAGE(2, mc->cluster_config->config_generation, + "bug-1469: apply_committed_entry's WAL_CONFIG_MARKER case never " + "activated the new config on the ORIGINATING member -- c->myconf " + "stayed pinned to the OLD config"); + TEST_ASSERT_EQUAL_STRING("t1469-new", mc->cluster_config->clustername); + TEST_ASSERT_EQUAL_HEX64(newtag, mc->config_version_tag); + TEST_ASSERT_EQUAL_INT(0, config_serve_fenced(c)); + + t43_free_myconf(c); + commit_engine_fini(&c->commit); + t42_teardown(c); + printf("test_wal_config_marker_apply_activates_originating_member_config: PASS\n"); +} + +/* ── config-upgrade-snapshot task 8.8: a second configuration-change marker + * committing before the first's snapshot install completes everywhere must + * cleanly SUPERSEDE the first's in-flight materialization -- never leave it + * partially applied or conflated with the newer one (Req 4.4, 7.2) ──────── + * + * design.md ("Overlapping-marker -EBUSY handling", ~line 258, and + * "Overlapping upgrades", ~line 413): when marker B's own apply runs while + * marker A's forced checkpoint is still physically in flight (holding the + * shared checkpoint_in_progress CAS), marker B's own checkpoint call ALSO + * hits -EBUSY -- not an error, self-resolving. Content is a deterministic + * function of (term, lsn, config-hash), and config_committed_marker always + * resolves to the LATEST committed marker within the committed prefix + * (scan_latest_committed_marker, config_repl.c:124-215, "later markers + * overwrite -- latest wins", line 198). So once checkpointing is unblocked + * and a fresh checkpoint attempt runs, it always reflects the latest marker + * -- never a stale/partial mix of the two. + * + * Two independently-built single-member fixtures process the IDENTICAL + * entry sequence (same term, same two deterministic config blobs via + * t1469_make_config_blob -- byte-identical across calls per its own doc + * comment, the same determinism-across-fixtures property task 8.7 + * Scenario 2 above already relies on): + * + * c_control -- marker A commits+applies+checkpoints normally, THEN marker + * B commits+applies+checkpoints normally. No racing. + * + * c_raced -- the shared checkpoint_in_progress CAS is held BEFORE marker A + * commits and never released until AFTER both markers have committed and + * applied: marker A's own forced checkpoint attempt -EBUSYs and skips + * (still "installing"), then marker B commits+applies while A's install is + * still outstanding, and marker B's own forced checkpoint attempt ALSO + * -EBUSYs and skips. Only after releasing the CAS and running + * persist_checkpoint() once directly (the same resolve step + * test_marker_apply_busy_checkpoint_handled_gracefully in + * test_upgrade_snapshot_apply.c uses) does a checkpoint actually land. + * + * NOTE on why this test does NOT assert whole-file byte-identity between the + * two fixtures' final checkpoints: c_control's marker A checkpoint + * physically WRITES a WAL_CHECKPOINT entry (persist_write_checkpoint_marker) + * before marker B is ever appended, consuming one physical WAL lsn slot that + * c_raced's fixture never consumes at that point (its checkpoint attempt for + * A never gets past the checkpoint_in_progress CAS check, so nothing is + * physically written for it). Marker B therefore lands at a DIFFERENT + * absolute physical lsn in each fixture (one higher in c_control) purely as + * a side effect of how many checkpoints happened to physically land before + * it -- exactly the "content is a deterministic function of (term, lsn, + * config-hash)" property this task's own description calls out (the + * checkpoint's own lsn is legitimately part of "content"). write_snapshot's + * sentinel header embeds this lsn verbatim at a fixed byte offset + * (persist.c: "magic (8) + checkpoint_lsn (8) + ..."), so the two files are + * expected to diverge at EXACTLY that one field. The decisive proof is + * instead: byte-identical content everywhere else -- the committed-config + * reference (cfgref_tag/cfgref_sha) and the entire entity+config-bytes + * payload -- which is precisely what would carry any trace of marker A's + * incomplete install, if one existed. snapdiff_paths is still used (for the + * diagnostic corroboration that the divergence, if any, is exactly and only + * that one field), alongside a direct field-aware comparison of everything + * from byte 16 onward. */ +static void test_second_config_marker_supersedes_first_still_installing_on_member(void) +{ + char tmp_control[256], tmp_raced[256]; + strcpy(tmp_control, "/tmp/xce_cr88_control_XXXXXX"); + strcpy(tmp_raced, "/tmp/xce_cr88_raced_XXXXXX"); + TEST_ASSERT_NOT_NULL(mkdtemp(tmp_control)); + TEST_ASSERT_NOT_NULL(mkdtemp(tmp_raced)); + + const uint64_t term = 88; + + cluster_t *c_control = t42_make_cluster(tmp_control); + cluster_t *c_raced = t42_make_cluster(tmp_raced); + TEST_ASSERT_NOT_NULL(c_control); + TEST_ASSERT_NOT_NULL(c_raced); + t42_make_leader(c_control, term, /*n_peers*/1); + t42_make_leader(c_raced, term, /*n_peers*/1); + TEST_ASSERT_EQUAL_INT(0, + commit_engine_init(&c_control->commit, &c_control->persist, 1, 8)); + TEST_ASSERT_EQUAL_INT(0, + commit_engine_init(&c_raced->commit, &c_raced->persist, 1, 8)); + repl_set_commit_engine(&c_control->persist.repl, &c_control->commit); + repl_set_commit_engine(&c_raced->persist.repl, &c_raced->commit); + myconf_t *mc_control = t43_attach_myconf(c_control, tmp_control); + myconf_t *mc_raced = t43_attach_myconf(c_raced, tmp_raced); + + /* Identical deterministic blobs across BOTH fixtures -- independent + * encode calls per fixture (t1469_make_config_blob's own doc comment: + * byte-identical for the same (gen, name) parameters). */ + size_t oldlen = 0, newlen = 0; + uint8_t *old_control = t1469_make_config_blob(1, "t1469-old", &oldlen); + uint8_t *new_control = t1469_make_config_blob(2, "t1469-new", &newlen); + uint8_t *old_raced = t1469_make_config_blob(1, "t1469-old", &oldlen); + uint8_t *new_raced = t1469_make_config_blob(2, "t1469-new", &newlen); + uint8_t oldsha[32], newsha[32]; + SHA256(old_control, oldlen, oldsha); + SHA256(new_control, newlen, newsha); + uint64_t oldtag; { uint64_t t; memcpy(&t, oldsha, 8); oldtag = be64toh(t); } + uint64_t newtag; { uint64_t t; memcpy(&t, newsha, 8); newtag = be64toh(t); } + + /* ── Fixture 1: control -- no racing; both markers checkpoint normally. */ + TEST_ASSERT_EQUAL_INT(0, + conf_save_config(mc_control, old_control, oldlen, oldsha)); + free(old_control); + t43_commit_marker(c_control, oldtag, oldsha); + TEST_ASSERT_EQUAL_INT(0, + conf_save_config(mc_control, new_control, newlen, newsha)); + free(new_control); + t43_commit_marker(c_control, newtag, newsha); + uint64_t control_ckpt_lsn = c_control->persist.checkpoint_lsn; + bool control_config_present = (mc_control->cluster_config != NULL); + uint64_t gen_control = + control_config_present ? mc_control->cluster_config->config_generation : 0; + int fenced_control = upgrade_materialization_fenced(c_control); + + /* ── Fixture 2: raced -- marker A's install is still genuinely + * outstanding (its checkpoint attempt never lands) when marker B + * commits. Hold the shared checkpoint_in_progress CAS BEFORE marker A + * commits and never release it until AFTER marker B has also committed + * and applied -- this is what makes marker A genuinely "still + * installing" at the moment marker B supersedes it, not a race that + * might or might not manifest. */ + TEST_ASSERT_EQUAL_INT(0, + conf_save_config(mc_raced, old_raced, oldlen, oldsha)); + free(old_raced); + + TEST_ASSERT_EQUAL_INT( + 0, atomic_exchange_explicit(&c_raced->persist.checkpoint_in_progress, + 1, memory_order_acq_rel)); + + /* Marker A: inline t43_commit_marker's 4-step body -- its signature must + * stay unmodified for other callers, and the CAS needs to stay held + * across BOTH markers, which a single call to t43_commit_marker cannot + * do. */ + uint64_t lsn_a = 0; + TEST_ASSERT_EQUAL_INT(0, + config_append_marker(c_raced, oldtag, oldsha, &lsn_a)); + TEST_ASSERT_EQUAL_INT(0, persist_flush(&c_raced->persist)); + TEST_ASSERT_EQUAL_INT(0, + commit_submit(&c_raced->commit, lsn_a, COMMIT_MODE_WAIT, 1000)); + t42_wait_applied(&c_raced->persist, lsn_a, 2000); + TEST_ASSERT_TRUE(persist_last_applied_lsn(&c_raced->persist) >= lsn_a); + + /* Marker B: committed and applied while the CAS is STILL held -- marker + * A's install has not happened yet. */ + TEST_ASSERT_EQUAL_INT(0, + conf_save_config(mc_raced, new_raced, newlen, newsha)); + free(new_raced); + uint64_t lsn_b = 0; + TEST_ASSERT_EQUAL_INT(0, + config_append_marker(c_raced, newtag, newsha, &lsn_b)); + TEST_ASSERT_EQUAL_INT(0, persist_flush(&c_raced->persist)); + TEST_ASSERT_EQUAL_INT(0, + commit_submit(&c_raced->commit, lsn_b, COMMIT_MODE_WAIT, 1000)); + t42_wait_applied(&c_raced->persist, lsn_b, 2000); + TEST_ASSERT_TRUE(persist_last_applied_lsn(&c_raced->persist) >= lsn_b); + + /* ── Mid-scenario: genuinely "still installing" -- captured BEFORE + * releasing the CAS. */ + bool config_present_mid = (mc_raced->cluster_config != NULL); + uint64_t gen_mid = + config_present_mid ? mc_raced->cluster_config->config_generation : 0; + char *clustername_mid = + (config_present_mid && mc_raced->cluster_config->clustername) + ? strdup(mc_raced->cluster_config->clustername) : NULL; + bool cfgref_present_mid = c_raced->persist.cfgref_present; + int fenced_mid = upgrade_materialization_fenced(c_raced); + + /* Release the CAS -- whatever else was (simulated to be) holding it has + * finished; marker A's and marker B's own checkpoint attempts are both + * long past (both -EBUSY'd and skipped). */ + atomic_store_explicit(&c_raced->persist.checkpoint_in_progress, 0, + memory_order_release); + + /* Resolve: a fresh checkpoint attempt, self-resolving per design.md -- + * mirrors test_marker_apply_busy_checkpoint_handled_gracefully's own + * resolve step (test_upgrade_snapshot_apply.c). A bare persist_checkpoint() + * call is NOT itself a marker-apply dispatch, so it does not call + * upgrade_materialization_verify() on its own -- that call only happens + * from apply_committed_entry's WAL_CONFIG_MARKER case (a NEW marker + * applying) or from the delaymgr-driven retry trampoline + * (schedule_upgrade_materialization_retry), and this bare fixture never + * initializes a delaymgr. schedule_upgrade_materialization_retry's own + * doc comment is explicit about this exact situation: "No-op when... + * the delaymgr is not running (the unit-test fixture path...) -- caller + * drives directly". Explicitly re-verify here, mirroring the 6.1-c fence + * tests above (e.g. immediately after t43_commit_marker) which do the + * same for the same reason. */ + int resolve_rc = persist_checkpoint(&c_raced->persist); + uint64_t raced_ckpt_lsn = c_raced->persist.checkpoint_lsn; + int verify_rc = upgrade_materialization_verify(c_raced); + + /* ── Post-resolve: the "settled" state. */ + uint64_t committed_tag_after = 0; + uint8_t committed_sha_after[32]; + int rc_committed_after = config_committed_marker( + c_raced, &committed_tag_after, committed_sha_after); + bool cfgref_matches_after = c_raced->persist.cfgref_present && + c_raced->persist.cfgref_tag == newtag && + memcmp(c_raced->persist.cfgref_sha, newsha, 32) == 0; + int fenced_after = upgrade_materialization_fenced(c_raced); + bool config_present_after = (mc_raced->cluster_config != NULL); + uint64_t gen_after = + config_present_after ? mc_raced->cluster_config->config_generation : 0; + char *clustername_after = + (config_present_after && mc_raced->cluster_config->clustername) + ? strdup(mc_raced->cluster_config->clustername) : NULL; + + /* ── Cross-fixture proof: settle both checkpoint file paths. */ + char control_snap_path[4096], raced_snap_path[4096]; + snprintf(control_snap_path, sizeof(control_snap_path), + "%s/snap-%016" PRIx64 ".capnp", c_control->persist.snap_path, + control_ckpt_lsn); + snprintf(raced_snap_path, sizeof(raced_snap_path), + "%s/snap-%016" PRIx64 ".capnp", c_raced->persist.snap_path, + raced_ckpt_lsn); + bool control_snap_exists = (access(control_snap_path, F_OK) == 0); + bool raced_snap_exists = (access(raced_snap_path, F_OK) == 0); + + snapdiff_report_t diff_rep; + memset(&diff_rep, 0, sizeof(diff_rep)); + int diff_rc = snapdiff_paths(control_snap_path, raced_snap_path, NULL, + &diff_rep); + + /* Independent, field-aware comparison: read both files fully and compare + * everything AFTER the 16-byte [magic(8) + checkpoint_lsn(8)] prefix -- + * i.e. cfgref_present/tag/sha, format_version, and the entire + * entity+config-bytes payload (write_snapshot's sentinel layout, + * persist.c). This excludes the ONE field expected to legitimately + * differ (the checkpoint's own physical WAL lsn) and asserts everything + * else -- which is what would carry any trace of marker A's incomplete + * install -- is byte-for-byte identical. */ + long control_size = -1, raced_size = -1; + uint8_t *control_buf = NULL, *raced_buf = NULL; + FILE *fp_control = fopen(control_snap_path, "rb"); + if (fp_control) { + fseek(fp_control, 0, SEEK_END); + control_size = ftell(fp_control); + fseek(fp_control, 0, SEEK_SET); + if (control_size > 0) { + control_buf = (uint8_t *)malloc((size_t)control_size); + if (control_buf) + TEST_ASSERT_EQUAL_INT((int)control_size, + (int)fread(control_buf, 1, (size_t)control_size, fp_control)); + } + fclose(fp_control); + } + FILE *fp_raced = fopen(raced_snap_path, "rb"); + if (fp_raced) { + fseek(fp_raced, 0, SEEK_END); + raced_size = ftell(fp_raced); + fseek(fp_raced, 0, SEEK_SET); + if (raced_size > 0) { + raced_buf = (uint8_t *)malloc((size_t)raced_size); + if (raced_buf) + TEST_ASSERT_EQUAL_INT((int)raced_size, + (int)fread(raced_buf, 1, (size_t)raced_size, fp_raced)); + } + fclose(fp_raced); + } + + bool sizes_match = (control_size >= 0 && control_size == raced_size); + bool payload_beyond_lsn_matches = false; + if (sizes_match && control_buf && raced_buf && control_size > 16) { + payload_beyond_lsn_matches = + (memcmp(control_buf + 16, raced_buf + 16, + (size_t)(control_size - 16)) == 0); + } + uint64_t control_lsn_in_file = 0, raced_lsn_in_file = 0; + if (control_buf && control_size >= 16) + memcpy(&control_lsn_in_file, control_buf + 8, 8); + if (raced_buf && raced_size >= 16) + memcpy(&raced_lsn_in_file, raced_buf + 8, 8); + + free(control_buf); + free(raced_buf); + + t43_free_myconf(c_control); + t43_free_myconf(c_raced); + commit_engine_fini(&c_control->commit); + commit_engine_fini(&c_raced->commit); + t42_teardown(c_control); + t42_teardown(c_raced); + + /* ── Assertions ──────────────────────────────────────────────────── */ + + /* Control baseline sanity. */ + TEST_ASSERT_TRUE(control_config_present); + TEST_ASSERT_EQUAL_UINT64(2, gen_control); + TEST_ASSERT_EQUAL_INT(0, fenced_control); + + /* Mid-scenario: genuinely "still installing". */ + TEST_ASSERT_TRUE_MESSAGE(config_present_mid, + "member B's own apply must have activated config independently of " + "marker A's install state"); + TEST_ASSERT_EQUAL_UINT64_MESSAGE(2, gen_mid, + "activation must reflect the LATEST marker (B) purely from B's own " + "apply, never re-activating to A afterward nor staying short of B"); + TEST_ASSERT_NOT_NULL(clustername_mid); + if (clustername_mid) + TEST_ASSERT_EQUAL_STRING("t1469-new", clustername_mid); + TEST_ASSERT_FALSE_MESSAGE(cfgref_present_mid, + "no checkpoint has physically landed for EITHER marker yet -- both " + "A's and B's checkpoint attempts were skipped via -EBUSY, proving " + "this is genuinely 'still installing', not a coincidental pass"); + TEST_ASSERT_EQUAL_INT_MESSAGE(1, fenced_mid, + "materialization for the latest committed marker (B) has not " + "completed yet -- the fence must still be set"); + + /* Post-resolve: settled state reflects ONLY marker B. */ + TEST_ASSERT_EQUAL_INT(0, rc_committed_after); + TEST_ASSERT_EQUAL_HEX64(newtag, committed_tag_after); + TEST_ASSERT_EQUAL_INT(0, memcmp(newsha, committed_sha_after, 32)); + TEST_ASSERT_EQUAL_INT_MESSAGE(0, resolve_rc, + "the resolving checkpoint attempt must succeed once the CAS guard " + "is free -- self-resolving, per design.md"); + TEST_ASSERT_EQUAL_INT_MESSAGE(0, verify_rc, + "the explicit re-verify (standing in for this bare fixture's absent " + "delaymgr-driven retry trampoline) must succeed once a checkpoint " + "has actually captured marker B"); + TEST_ASSERT_TRUE_MESSAGE(cfgref_matches_after, + "the checkpoint sentinel must now reflect marker B, never marker A"); + TEST_ASSERT_EQUAL_INT_MESSAGE(0, fenced_after, + "the fence must clear once materialization for the latest marker " + "(B) completes"); + TEST_ASSERT_TRUE(config_present_after); + TEST_ASSERT_EQUAL_UINT64(2, gen_after); + TEST_ASSERT_NOT_NULL(clustername_after); + if (clustername_after) + TEST_ASSERT_EQUAL_STRING("t1469-new", clustername_after); + + /* Cross-fixture proof -- the decisive assertion for Req 4.4/7.2. */ + TEST_ASSERT_TRUE_MESSAGE(control_snap_exists, + "control fixture must have produced a checkpoint at marker B's lsn"); + TEST_ASSERT_TRUE_MESSAGE(raced_snap_exists, + "raced fixture must have produced a checkpoint once resolved"); + TEST_ASSERT_TRUE_MESSAGE(sizes_match, + "both fixtures' settled checkpoints must be the same total size -- " + "identical entity/config content, differing at most in the " + "embedded physical WAL lsn"); + TEST_ASSERT_TRUE_MESSAGE(payload_beyond_lsn_matches, + "Req 4.4/7.2: beyond the one field that legitimately differs " + "(the checkpoint's own physical WAL lsn -- itself content per this " + "task's own 'deterministic function of (term, lsn, config-hash)' " + "framing), the settled checkpoint produced after racing marker A's " + "incomplete install must be byte-for-byte identical to the " + "non-raced control -- no trace of marker A's partially-applied " + "intermediate state survives into marker B's final materialized " + "output"); + + /* Diagnostic corroboration: snapdiff_paths independently confirms + * whether the files are literally byte-identical end-to-end, and if + * not, that the sole divergence is exactly that one embedded-lsn field + * (offset 8, per write_snapshot's sentinel layout). */ + TEST_ASSERT_TRUE_MESSAGE(diff_rc >= 0, + "snapdiff_paths must not error opening either checkpoint file"); + TEST_ASSERT_EQUAL_INT_MESSAGE(0, diff_rep.size_mismatch, + "file sizes must match even if the embedded physical lsn differs"); + if (!diff_rep.identical) { + TEST_ASSERT_EQUAL_INT_MESSAGE(8, (int)diff_rep.diff_offset, + "the only expected divergence is the embedded checkpoint_lsn " + "field at byte offset 8 (write_snapshot's sentinel layout)"); + } + TEST_ASSERT_EQUAL_UINT64(control_ckpt_lsn, control_lsn_in_file); + TEST_ASSERT_EQUAL_UINT64(raced_ckpt_lsn, raced_lsn_in_file); + + free(clustername_mid); + free(clustername_after); + + printf("test_second_config_marker_supersedes_first_still_installing_on_" + "member: PASS\n"); +} + +/* ── config-upgrade-snapshot task 8.7 Scenario 2: leadership change mid- + * materialization does not special-case, and completes via the SAME generic + * apply-drain path (Req 5.4) ──────────────────────────────────────────── + * + * design.md's own "Key simplification found during design" (persist.c's + * WAL_CONFIG_MARKER case doc comment, apply_committed_entry): "no new + * leader-specific 'resume' logic is needed either, since a newly-elected + * leader satisfies this the same way, by continuing to apply its own + * committed log." This test proves that claim structurally rather than + * asserting it by fiat. + * + * The concrete mechanism (read directly out of raft_cb_become_leader, + * ha.c:1516-1979): the promotion-time eligibility gate + * (upgrade_materialization_fenced(c), ha.c:1763) only refuses promotion when + * the fence has ALREADY been set by a prior upgrade_materialization_verify() + * call. A marker that is committed but has never yet been through + * apply_committed_entry() at all -- a genuine apply backlog, not a checkpoint + * failure -- leaves the fence at its zero-initialized (unfenced) default, + * because nothing has evaluated it yet. So promotion is NOT refused in this + * case. What actually drains the backlog is ha.c:1878's + * persist_apply_pump_run_sync(&c->persist) call, unconditionally issued right + * after role flips to CTRL_PRIMARY -- the SAME synchronous drain function + * bug-1043's job-backlog fix added for an entirely unrelated reason (a + * promoted standby's un-applied committed jobs must be visible immediately). + * The WAL_CONFIG_MARKER case (persist.c) rides that pre-existing, generic + * drain for free: no leadership-specific config-upgrade code exists anywhere + * in the promotion path. + * + * This test drives that exact mechanism directly + * (persist_apply_pump_run_sync) rather than the full + * raft_cb_become_leader_with_cluster_for_test() tail, deliberately: the rest + * of that function's post-drain tail (quorum-transition logging, config push, + * ctrlhello, persist-hook registration, heartbeat start, own-term gate arm) + * is orthogonal to Requirement 5.4's materialization-continuation claim and + * would require a substantially larger, novel fixture (full ha_init + + * delaymgr_init, mirroring test_convergence_verification.c's cv_setup -- + * this file's own t42_/t43_ fixtures deliberately do NOT wire that, since no + * other test in this file drives promotion past the fence-refusal point) to + * exercise safely -- a scope expansion this test-only task should not take + * on. The GATING half of Req 5.4 (a member whose fence IS already set + * refuses promotion) is already exhaustively covered by + * test_upgrade_materialization_fence_enforced_by_dispatch_gate_and_promotion + * (6.2-a) and + * test_wal_config_marker_apply_sets_fence_via_real_checkpoint_miss (6.2 + * remediation) above, both via the real raft_cb_become_leader_with_cluster_ + * for_test() gate -- this test does not repeat that proof, it closes the + * CONTINUATION half neither of those tests reach (both stop at the refusal; + * neither goes on to clear the condition and confirm materialization + * completes normally afterward). + * + * Rigor: builds TWO independent members (A: promoted mid-backlog: role set + * CTRL_PRIMARY the same way every other test in this file simulates + * promotion (t42_make_leader), THEN drained via persist_apply_pump_run_sync + * -- the same function production promotion invokes; B: never promoted, + * drained via the ordinary persist_apply_pump_run()) starting from the + * IDENTICAL committed marker + config bytes, and asserts their resulting + * checkpoints are BYTE-IDENTICAL (snapdiff_paths) -- not merely that both + * "also complete," but that they complete IDENTICALLY, mirroring bug-857's + * own two-member convergence-proof style (test_bug857_regression.c). + */ +static void test_leadership_change_mid_materialization_completes_via_same_generic_apply_drain(void) +{ + char tmp_a[256], tmp_b[256]; + strcpy(tmp_a, "/tmp/xce_cr87s2_a_XXXXXX"); + strcpy(tmp_b, "/tmp/xce_cr87s2_b_XXXXXX"); + TEST_ASSERT_NOT_NULL(mkdtemp(tmp_a)); + TEST_ASSERT_NOT_NULL(mkdtemp(tmp_b)); + + cluster_t *c_a = t42_make_cluster(tmp_a); + cluster_t *c_b = t42_make_cluster(tmp_b); + TEST_ASSERT_NOT_NULL(c_a); + TEST_ASSERT_NOT_NULL(c_b); + + myconf_t *mc_a = t43_attach_myconf(c_a, tmp_a); + myconf_t *mc_b = t43_attach_myconf(c_b, tmp_b); + + /* Identical config bytes on both members (t43_make_config_blob is + * documented byte-identical across calls -- exactly what this test + * wants, since A and B must start from the SAME upgrade content for a + * byte-identical-outcome comparison to be meaningful). */ + size_t blen = 0; + uint8_t *bytes = t43_make_config_blob(&blen); + uint8_t sha[32]; + SHA256(bytes, blen, sha); + uint64_t tag; { uint64_t tmp; memcpy(&tmp, sha, 8); tag = be64toh(tmp); } + + int rc_save_a = conf_save_config(mc_a, bytes, blen, sha); + int rc_save_b = conf_save_config(mc_b, bytes, blen, sha); + free(bytes); + + uint8_t marker_payload[WAL_CONFIG_MARKER_PAYLOAD_LEN]; + size_t out_len = 0; + int rc_encode = config_marker_encode(tag, sha, marker_payload, + WAL_CONFIG_MARKER_PAYLOAD_LEN, + &out_len); + + /* Append the SAME marker directly to each member's physical WAL + * (persist_wal_async, bypassing config_append_marker/commit_submit's + * commit-engine/fsync-worker machinery entirely) and advance + * committed_lsn directly -- mirrors test_bug857_regression.c's own + * Scenario 2 technique exactly, chosen for the identical reason: it is + * the only DETERMINISTIC way to leave a marker genuinely committed but + * NOT YET applied (a real apply backlog) without racing this fixture's + * background fsync_worker thread, which a commit_submit(WAIT) round + * trip cannot guarantee (see t42_wait_applied's own doc comment on this + * exact race). */ + int rc_wal_a = persist_wal_async(&c_a->persist, WAL_CONFIG_MARKER, + marker_payload, + WAL_CONFIG_MARKER_PAYLOAD_LEN); + uint64_t marker_lsn_a = c_a->persist.current_lsn - 1; + uint64_t committed_a = persist_committed_lsn_advance_atomic( + &c_a->persist, marker_lsn_a); + + int rc_wal_b = persist_wal_async(&c_b->persist, WAL_CONFIG_MARKER, + marker_payload, + WAL_CONFIG_MARKER_PAYLOAD_LEN); + uint64_t marker_lsn_b = c_b->persist.current_lsn - 1; + uint64_t committed_b = persist_committed_lsn_advance_atomic( + &c_b->persist, marker_lsn_b); + + /* Precondition (validates this is genuinely the "backlog, never yet + * evaluated" case, not the "already fenced" case 6.2-a covers): neither + * member has applied anything yet, and neither fence has ever been + * evaluated for this marker, so both read unfenced by construction. */ + uint64_t last_applied_before_a = persist_last_applied_lsn(&c_a->persist); + uint64_t last_applied_before_b = persist_last_applied_lsn(&c_b->persist); + int fenced_before_a = upgrade_materialization_fenced(c_a); + int fenced_before_b = upgrade_materialization_fenced(c_b); + + /* A: "leadership change" -- promoted via this fixture family's own + * established promotion-simulation call (t42_make_leader; every test in + * this file uses it for this purpose except the ones specifically + * proving the real election-time GATE itself, which this test does not + * re-prove -- see header comment). Confirm becoming primary alone has NO + * bearing on the fence (still reads unfenced immediately after the role + * flip -- nothing leader-specific touches it), THEN drive the exact + * function production promotion uses to drain a backlog + * (persist_apply_pump_run_sync, ha.c:1878). */ + t42_make_leader(c_a, /*term*/60, /*n_peers*/1); + int32_t role_after_promotion = + atomic_load_explicit(&c_a->ha.role, memory_order_acquire); + int fenced_immediately_after_promotion = upgrade_materialization_fenced(c_a); + persist_apply_pump_run_sync(&c_a->persist); + + /* B: no leadership change at all -- drained via the ordinary, + * always-available apply-pump entry point every non-promoted member + * (standby or an already-serving primary catching up its own backlog) + * uses identically. */ + int applied_b = persist_apply_pump_run(&c_b->persist); + + uint64_t last_applied_after_a = persist_last_applied_lsn(&c_a->persist); + uint64_t last_applied_after_b = persist_last_applied_lsn(&c_b->persist); + int fenced_after_a = upgrade_materialization_fenced(c_a); + int fenced_after_b = upgrade_materialization_fenced(c_b); + + uint64_t gen_a = mc_a->cluster_config ? mc_a->cluster_config->config_generation : 0; + uint64_t gen_b = mc_b->cluster_config ? mc_b->cluster_config->config_generation : 0; + bool cluster_config_a_present = (mc_a->cluster_config != NULL); + bool cluster_config_b_present = (mc_b->cluster_config != NULL); + + char snap_a[4096], snap_b[4096]; + snprintf(snap_a, sizeof(snap_a), "%s/snap-%016" PRIx64 ".capnp", + c_a->persist.snap_path, marker_lsn_a); + snprintf(snap_b, sizeof(snap_b), "%s/snap-%016" PRIx64 ".capnp", + c_b->persist.snap_path, marker_lsn_b); + bool snap_a_exists = (access(snap_a, F_OK) == 0); + bool snap_b_exists = (access(snap_b, F_OK) == 0); + + snapdiff_report_t diff_rep; + memset(&diff_rep, 0, sizeof(diff_rep)); + int diff_rc = snapdiff_paths(snap_a, snap_b, NULL, &diff_rep); + + t43_free_myconf(c_a); + t43_free_myconf(c_b); + t42_teardown(c_a); + t42_teardown(c_b); + + /* ── Assertions ──────────────────────────────────────────────────── */ + + TEST_ASSERT_EQUAL_INT(0, rc_save_a); + TEST_ASSERT_EQUAL_INT(0, rc_save_b); + TEST_ASSERT_EQUAL_INT(0, rc_encode); + TEST_ASSERT_EQUAL_INT(0, rc_wal_a); + TEST_ASSERT_EQUAL_INT(0, rc_wal_b); + TEST_ASSERT_EQUAL_UINT64(marker_lsn_a, committed_a); + TEST_ASSERT_EQUAL_UINT64(marker_lsn_b, committed_b); + TEST_ASSERT_EQUAL_UINT64_MESSAGE(marker_lsn_a, marker_lsn_b, + "both members must start from the SAME marker lsn for a " + "byte-identical-outcome comparison to be meaningful"); + + TEST_ASSERT_EQUAL_UINT64_MESSAGE(0, last_applied_before_a, + "precondition: member A must not have applied anything yet"); + TEST_ASSERT_EQUAL_UINT64_MESSAGE(0, last_applied_before_b, + "precondition: member B must not have applied anything yet"); + TEST_ASSERT_EQUAL_INT_MESSAGE(0, fenced_before_a, + "precondition: an unevaluated backlog must NOT already be fenced -- " + "this is genuinely the case existing 6.2 tests don't cover, " + "distinct from a fence already set by a prior checkpoint miss"); + TEST_ASSERT_EQUAL_INT(0, fenced_before_b); + + TEST_ASSERT_EQUAL_INT_MESSAGE((int32_t)CTRL_PRIMARY, role_after_promotion, + "the promotion simulation must actually take effect"); + TEST_ASSERT_EQUAL_INT_MESSAGE(0, fenced_immediately_after_promotion, + "becoming primary must have NO bearing on the fence by itself -- no " + "leader-specific code sets or clears it as a side effect of the " + "role transition"); + + TEST_ASSERT_TRUE_MESSAGE(last_applied_after_a >= marker_lsn_a, + "Req 5.4: the SAME generic sync-drain function production " + "promotion invokes (persist_apply_pump_run_sync) must complete " + "materialization for the backlogged marker -- no special resume " + "logic needed, none exists"); + TEST_ASSERT_EQUAL_INT_MESSAGE(1, applied_b, + "control: the non-promoted member's ordinary apply pump must " + "apply exactly the one backlogged marker entry"); + TEST_ASSERT_TRUE_MESSAGE(last_applied_after_b >= marker_lsn_b, + "control: the non-promoted member's ordinary apply pump must " + "complete materialization identically"); + TEST_ASSERT_EQUAL_INT_MESSAGE(0, fenced_after_a, + "member A's materialization must be genuinely verified complete " + "(fence clears), not merely attempted"); + TEST_ASSERT_EQUAL_INT(0, fenced_after_b); + + TEST_ASSERT_TRUE_MESSAGE(cluster_config_a_present, + "member A's config must have activated as part of the same " + "marker-apply dispatch, exactly as it does for any non-promoted " + "member (bug-1469)"); + TEST_ASSERT_TRUE(cluster_config_b_present); + TEST_ASSERT_EQUAL_UINT64(1, gen_a); /* t43_make_config_blob's hardcoded generation */ + TEST_ASSERT_EQUAL_UINT64(gen_b, gen_a); + + TEST_ASSERT_TRUE_MESSAGE(snap_a_exists, + "member A must have produced a checkpoint at the marker's own lsn"); + TEST_ASSERT_TRUE_MESSAGE(snap_b_exists, + "member B must have produced a checkpoint at the marker's own lsn"); + + /* THE decisive proof: materialization triggered by a leadership change + * mid-backlog produces EXACTLY the same artifact as an ordinary, + * never-promoted member's continued apply of the identical marker -- + * "completes identically to the non-promoted case," not merely "also + * completes." */ + TEST_ASSERT_EQUAL_INT_MESSAGE(0, diff_rc, + "Req 5.4: a leadership-change-driven materialization drain must " + "produce a checkpoint byte-identical to the non-promoted member's"); + TEST_ASSERT_TRUE_MESSAGE(diff_rep.identical, + "no leader-specific divergence exists in the materialized output"); + + printf("test_leadership_change_mid_materialization_completes_via_" + "same_generic_apply_drain: PASS\n"); +} + /* ── wait_all_with_timeout (XCE_TESTING shim) ───── */ #ifdef XCE_TESTING @@ -1780,6 +3492,569 @@ static void test_configpush_transport_holds_endpoint_ref_across_send(void) printf("test_configpush_transport_holds_endpoint_ref_across_send: PASS\n"); } +/* raft-adapter-conformance task 2.1 (Req 2.2, 2.3, 2.5, 7.4): a config-push + * reject must now send an explicit ReplConfigPushReply{accepted=0, term} + * back to the primary instead of returning silently. This is a minimal, + * representative proof that the new config_push_reply_send_hook actually + * fires -- exercised here via ONE reject path (SHA-256 mismatch). Task 2.3 + * expands this into full coverage of all four reject paths plus the EAGAIN + * accept-path and the cluster.c term-adoption wiring; this test is kept + * deliberately minimal so it doesn't collide with that broader coverage. */ +static uint64_t g_cpr21_hook_term; +static uint64_t g_cpr21_hook_version_tag; +static int g_cpr21_hook_accepted; +static int g_cpr21_hook_called; + +static void cpr21_reply_capture(uint64_t term, uint64_t version_tag, int accepted) +{ + g_cpr21_hook_called = 1; + g_cpr21_hook_term = term; + g_cpr21_hook_version_tag = version_tag; + g_cpr21_hook_accepted = accepted; +} + +static void test_config_push_sha256_mismatch_sends_explicit_reject_reply(void) +{ + char tmp[256]; + strcpy(tmp, "/tmp/xce_cr21_shamis_XXXXXX"); + TEST_ASSERT_NOT_NULL(mkdtemp(tmp)); + + cluster_t *c = t42_make_cluster(tmp); + TEST_ASSERT_NOT_NULL(c); + t43_attach_myconf(c, tmp); + + atomic_store(&c->ha.role, CTRL_STANDBY); + atomic_store(&c->ha.term, 7); + + /* Deliberately mismatched payload: raw_sha256 does NOT hash to + * raw_bytes -- exercises the real SHA-256-mismatch reject branch. */ + uint8_t payload[16]; + memset(payload, 0xAB, sizeof(payload)); + uint8_t wrong_sha[32]; + memset(wrong_sha, 0x00, sizeof(wrong_sha)); /* SHA256(payload) != all-zero */ + + repl_config_push_req_t rcpr; + memset(&rcpr, 0, sizeof(rcpr)); + rcpr.version_tag = 0x1234; + rcpr.raw_bytes = payload; + rcpr.raw_bytes_len = sizeof(payload); + rcpr.raw_sha256 = wrong_sha; + + xce_request_t req; + memset(&req, 0, sizeof(req)); + req.body_which = Request_body_replconfigpushrequestmsg; + req.body.replconfigpushrequestmsg = &rcpr; + + g_cpr21_hook_called = 0; + config_push_reply_send_hook = cpr21_reply_capture; + + int rc = handle_repl_config_push(c, /*ep*/NULL, &req); + + config_push_reply_send_hook = NULL; /* uninstall before any assertion can fail */ + + TEST_ASSERT_EQUAL_INT(-EBADMSG, rc); + TEST_ASSERT_TRUE_MESSAGE(g_cpr21_hook_called, + "raft-adapter-conformance 2.1: a config-push SHA-256 mismatch must " + "send an explicit ReplConfigPushReply, not silence it entirely"); + TEST_ASSERT_EQUAL_INT_MESSAGE(0, g_cpr21_hook_accepted, + "the reply for a rejected config push must carry accepted=0"); + TEST_ASSERT_EQUAL_UINT64(7, g_cpr21_hook_term); + + t43_free_myconf(c); + t42_teardown(c); + char cmd[512]; + snprintf(cmd, sizeof(cmd), "rm -rf %s", tmp); + system(cmd); + printf("test_config_push_sha256_mismatch_sends_explicit_reject_reply: PASS\n"); +} + +/* raft-adapter-conformance task 2.2 (Req 7.4, 7.5): a config-push reply + * arriving on the PRIMARY's inbound standby endpoint now carries the + * replying member's current term (task 1 schema addition + task 2.1 send + * side). myreq_handler's ReplConfigPushReply branch (cluster.c) must route + * that term through raft_on_higher_term_observed -- the SAME term-discovery + * entry point the heartbeat-reply and WAL-NACK vectors already use + * (bug-1421; ha.c ~6650/~6753) -- so a stale-term primary adopts the higher + * term and steps down instead of retrying forever against a standby that + * has already moved on. + * + * Drives the REAL decode+dispatch path: builds the wire bytes exactly as + * the standby's send_config_push_reply puts them on the wire + * (config_repl.c), then pushes them through myreq_handler_for_test -- the + * production myreq_handler exposed for tests (cluster.c), same precedent as + * peer_ctrl_msg_handler_for_test in ha.c. + * + * Fixture mirrors test_intake_higher_term_heartbeat_adopts_term + * (test_term_safety_adapter.c): ha->role is left at CTRL_STANDBY (which + * ha_dispatch_gate admits OPCode_reply for unconditionally, ha.c ~4637) so + * the fixture doesn't need real quorum/replicator plumbing, while the RAFT + * LIBRARY's own role is forced to RAFT_LEADER -- so the "adopt term and + * step down from leadership" observable is scoped precisely to + * raft_on_higher_term_observed's own was_leader/step-down behavior, without + * dragging in the separate CTRL_PRIMARY-demotion side-effect chain (commit + * engine / hooks), which is a different, already-covered code path. */ +extern int myreq_handler_for_test(endpoint_t *ep, io_packet_t *pkt); + +/* Local fakes satisfying cluster.c's OTHER, unrelated OPCode-switch-case + * dependencies now that cluster.c is linked into controller_unit_test + * (meson.build -- required so myreq_handler_for_test above is reachable at + * all). None of these are exercised by the OPCode_reply/ReplConfigPushReply + * path this test drives; they exist purely to satisfy the linker for + * cluster.c's other switch cases (job/task/scheduler/apiserver/get/ + * clusterconf handling), which pull in task.c/opget.c/sched.c/apiserver.c/ + * myconf.c -- files intentionally NOT part of this binary (see the sched.c/ + * dataex.c comment above sched_push_unit_test_src, meson.build). Same + * precedent as test_worker_join.c / test_commit_barrier_reply.c's own local + * fakes for on_scheduler_join()/notify()/collect_confvars(). */ +int apiserver_init(cluster_t *c) +{ (void)c; return 0; } +int on_task_start(cluster_t *c, xce_task_pidinfo_t *info) +{ (void)c; (void)info; return 0; } +int on_task_fail(cluster_t *c, xce_task_failinfo_t *info) +{ (void)c; (void)info; return 0; } +int on_task_finish(cluster_t *c, xce_task_finish_t *info) +{ (void)c; (void)info; return 0; } +int do_get_op(cluster_t *c, endpoint_t *ep, xce_request_t *req) +{ (void)c; (void)ep; (void)req; return 0; } +int handle_scheduler_leave(cluster_t *c) +{ (void)c; return 0; } +int add_config(void *c, char *name, char *value) +{ (void)c; (void)name; (void)value; return 0; } +cluster_config_t *get_default_conf(void *cl) +{ (void)cl; return NULL; } +int handle_clusterconf(cluster_t *c, endpoint_t *ep, xce_request_t *req) +{ (void)c; (void)ep; (void)req; return 0; } +int do_runtasks(cluster_t *c, endpoint_t *ep, xce_request_t *req) +{ (void)c; (void)ep; (void)req; return 0; } +int handle_apiserver_leave(cluster_t *c, endpoint_t *ep) +{ (void)c; (void)ep; return 0; } + +static io_packet_t *cpr22_build_config_push_reply_pkt(int accepted, + uint64_t version_tag, + uint64_t term) +{ + struct capn cs; + struct capn_segment *seg; + struct ReplConfigPushReply ack_capn; + ReplConfigPushReply_ptr ack_ptr; + struct RequestReply rr_capn; + RequestReply_ptr rr_ptr; + struct Request rq_capn; + Request_ptr rq_ptr; + io_packet_t *pkt; + + capn_init_malloc(&cs); + seg = capn_root(&cs).seg; + + memset(&ack_capn, 0, sizeof(ack_capn)); + ack_capn.accepted = accepted ? 1 : 0; + ack_capn.versionTag = version_tag; + ack_capn.term = term; + ack_ptr = new_ReplConfigPushReply(seg); + write_ReplConfigPushReply(&ack_capn, ack_ptr); + + memset(&rr_capn, 0, sizeof(rr_capn)); + rr_capn.seq = 1; + rr_capn.opcode = OPCode_replConfigPush; + rr_capn.status = 0; + rr_capn.data_which = RequestReply_data_replconfigpushreplymsg; + rr_capn.data.replconfigpushreplymsg = ack_ptr; + rr_ptr = new_RequestReply(seg); + write_RequestReply(&rr_capn, rr_ptr); + + memset(&rq_capn, 0, sizeof(rq_capn)); + rq_capn.opcode = OPCode_reply; + rq_capn.seq = 1; + rq_capn.body_which = Request_body_replymsg; + rq_capn.body.replymsg = rr_ptr; + rq_ptr = new_Request(seg); + write_Request(&rq_capn, rq_ptr); + capn_setp(capn_root(&cs), 0, rq_ptr.p); + + pkt = calloc(1, sizeof(*pkt)); + TEST_ASSERT_NOT_NULL_MESSAGE(pkt, "config-push reply pkt alloc"); + pkt->sz = capn_size(&cs); + TEST_ASSERT_TRUE_MESSAGE(alloc_packet(pkt) >= 0, + "config-push reply pkt data alloc"); + capn_write_mem(&cs, (uint8_t *)pkt->data, (size_t)pkt->sz, 0); + capn_free(&cs); + + return pkt; +} + +static void test_config_push_reply_higher_term_adopts_and_steps_down(void) +{ + char tmp[256]; + strcpy(tmp, "/tmp/xce_cr22_term_XXXXXX"); + TEST_ASSERT_NOT_NULL(mkdtemp(tmp)); + + cluster_t *c = t42_make_cluster(tmp); + TEST_ASSERT_NOT_NULL(c); + + atomic_store(&c->ha.role, CTRL_STANDBY); + atomic_store(&c->ha.term, 5); + ha_init_raft(&c->ha, c, /*n_peers*/3); + c->ha.raft.term = 5; + c->ha.raft.role = RAFT_LEADER; + + endpoint_t ep; + memset(&ep, 0, sizeof(ep)); + ep.owner = c; + + /* Reject (accepted=0) carrying a higher term (9 > 5): Req 7.4/7.5 + * require the term check to fire regardless of accept/reject -- a + * rejected push can still carry a useful higher term. */ + io_packet_t *pkt = + cpr22_build_config_push_reply_pkt(/*accepted*/0, + /*version_tag*/0xABCD, + /*term*/9); + TEST_ASSERT_NOT_NULL(pkt); + + int rc = myreq_handler_for_test(&ep, pkt); + TEST_ASSERT_EQUAL_INT(0, rc); + + TEST_ASSERT_EQUAL_UINT64_MESSAGE(9, c->ha.raft.term, + "raft-adapter-conformance 7.4: a config-push reply's higher term " + "must be adopted via raft_on_higher_term_observed"); + TEST_ASSERT_NOT_EQUAL_INT_MESSAGE(RAFT_LEADER, c->ha.raft.role, + "raft-adapter-conformance 7.5: leadership held at the lower term " + "must be stepped down once a higher term is observed"); + + /* NOTE: pkt is already fully freed by this point -- myreq_handler_for_test + * routes through myreq_handler -> xce_decode(), and xce_decode() + * unconditionally calls free_packet(pkt)+FREEUP(pkt) before returning + * (request.c). Do NOT free pkt here: it is a dangling pointer to freed + * memory and a second free_packet()/free() on it is a heap + * use-after-free/double-free (caught by ASAN regardless of + * detect_leaks). See myreq_handler_for_test's doc comment in cluster.c + * for the corrected ownership contract. */ + + t42_teardown(c); + char cmd[512]; + snprintf(cmd, sizeof(cmd), "rm -rf %s", tmp); + system(cmd); + printf("test_config_push_reply_higher_term_adopts_and_steps_down: PASS\n"); +} + +/* raft-adapter-conformance task 2.3 (Req 2.2, 2.3, 2.5, 7.4): task 2.1's own + * test (above) proved only ONE of the four handle_repl_config_push reject + * early-returns actually invokes the send-hook (SHA-256 mismatch). This + * closes the gap for the FIRST reject condition: a malformed request + * (body_which mismatch or a NULL replconfigpushrequestmsg payload). */ +static void test_config_push_malformed_request_sends_explicit_reject_reply(void) +{ + char tmp[256]; + strcpy(tmp, "/tmp/xce_cr23_malformed_XXXXXX"); + TEST_ASSERT_NOT_NULL(mkdtemp(tmp)); + + cluster_t *c = t42_make_cluster(tmp); + TEST_ASSERT_NOT_NULL(c); + t43_attach_myconf(c, tmp); + + atomic_store(&c->ha.role, CTRL_STANDBY); + atomic_store(&c->ha.term, 11); + + /* Malformed: body_which claims a config-push request, but the payload + * pointer itself is NULL -- the adapter's own dereference guard. */ + xce_request_t req; + memset(&req, 0, sizeof(req)); + req.body_which = Request_body_replconfigpushrequestmsg; + req.body.replconfigpushrequestmsg = NULL; + + g_cpr21_hook_called = 0; + config_push_reply_send_hook = cpr21_reply_capture; + + int rc = handle_repl_config_push(c, /*ep*/NULL, &req); + + config_push_reply_send_hook = NULL; /* uninstall before any assertion can fail */ + + TEST_ASSERT_EQUAL_INT(-EINVAL, rc); + TEST_ASSERT_TRUE_MESSAGE(g_cpr21_hook_called, + "raft-adapter-conformance 2.3: a malformed config-push request must " + "send an explicit ReplConfigPushReply, not silence it entirely"); + TEST_ASSERT_EQUAL_INT_MESSAGE(0, g_cpr21_hook_accepted, + "the reply for a malformed config-push request must carry accepted=0"); + TEST_ASSERT_EQUAL_UINT64(11, g_cpr21_hook_term); + + t43_free_myconf(c); + t42_teardown(c); + char cmd[512]; + snprintf(cmd, sizeof(cmd), "rm -rf %s", tmp); + system(cmd); + printf("test_config_push_malformed_request_sends_explicit_reject_reply: PASS\n"); +} + +/* raft-adapter-conformance task 2.3 (Req 2.2, 2.3, 2.5, 7.4): the SECOND + * reject condition -- a well-formed envelope whose payload is missing bytes + * and/or a sha256 -- must also send an explicit reject reply. */ +static void test_config_push_missing_bytes_sends_explicit_reject_reply(void) +{ + char tmp[256]; + strcpy(tmp, "/tmp/xce_cr23_missing_XXXXXX"); + TEST_ASSERT_NOT_NULL(mkdtemp(tmp)); + + cluster_t *c = t42_make_cluster(tmp); + TEST_ASSERT_NOT_NULL(c); + t43_attach_myconf(c, tmp); + + atomic_store(&c->ha.role, CTRL_STANDBY); + atomic_store(&c->ha.term, 12); + + /* Well-formed envelope, but bytes/len/sha256 are entirely absent. */ + repl_config_push_req_t rcpr; + memset(&rcpr, 0, sizeof(rcpr)); + rcpr.version_tag = 0x4242; + rcpr.raw_bytes = NULL; + rcpr.raw_bytes_len = 0; + rcpr.raw_sha256 = NULL; + + xce_request_t req; + memset(&req, 0, sizeof(req)); + req.body_which = Request_body_replconfigpushrequestmsg; + req.body.replconfigpushrequestmsg = &rcpr; + + g_cpr21_hook_called = 0; + config_push_reply_send_hook = cpr21_reply_capture; + + int rc = handle_repl_config_push(c, /*ep*/NULL, &req); + + config_push_reply_send_hook = NULL; /* uninstall before any assertion can fail */ + + TEST_ASSERT_EQUAL_INT(-EINVAL, rc); + TEST_ASSERT_TRUE_MESSAGE(g_cpr21_hook_called, + "raft-adapter-conformance 2.3: missing bytes/sha256 must send an " + "explicit ReplConfigPushReply, not silence it entirely"); + TEST_ASSERT_EQUAL_INT_MESSAGE(0, g_cpr21_hook_accepted, + "the reply for missing bytes/sha256 must carry accepted=0"); + TEST_ASSERT_EQUAL_UINT64(12, g_cpr21_hook_term); + + t43_free_myconf(c); + t42_teardown(c); + char cmd[512]; + snprintf(cmd, sizeof(cmd), "rm -rf %s", tmp); + system(cmd); + printf("test_config_push_missing_bytes_sends_explicit_reject_reply: PASS\n"); +} + +/* raft-adapter-conformance task 2.3 (Req 2.2, 2.3, 2.5, 7.4): the FOURTH + * reject condition -- a local conf_save_config() failure -- must also send + * an explicit reject reply. conf_save_config is forced to fail + * deterministically by planting its target "conf" directory as a plain FILE + * instead: mkdir(conf_dir, 0700) then fails with EEXIST (tolerated -- + * conf_save_config only bails on a DIFFERENT errno), but the very next step + * -- open()ing a path INSIDE conf_dir -- hits ENOTDIR because conf_dir is + * not actually a directory. This gives a real, deterministic failure without + * relying on filesystem permission semantics (chmod-based EACCES tricks are + * unreliable when the test runs as a privileged/sandboxed uid). */ +static void test_config_push_save_failure_sends_explicit_reject_reply(void) +{ + char tmp[256]; + strcpy(tmp, "/tmp/xce_cr23_savefail_XXXXXX"); + TEST_ASSERT_NOT_NULL(mkdtemp(tmp)); + + cluster_t *c = t42_make_cluster(tmp); + TEST_ASSERT_NOT_NULL(c); + t43_attach_myconf(c, tmp); + + atomic_store(&c->ha.role, CTRL_STANDBY); + atomic_store(&c->ha.term, 13); + + /* persist_init (t42_make_cluster) already creates tmp/ctrl-test/data/... + * which brings tmp/ctrl-test itself into existence -- tolerate EEXIST. */ + char instdir[512]; + snprintf(instdir, sizeof(instdir), "%s/ctrl-test", tmp); + TEST_ASSERT_TRUE_MESSAGE(mkdir(instdir, 0700) == 0 || errno == EEXIST, + "must be able to ensure the myconf effective_dir exists for the fixture"); + char conf_as_file[560]; + snprintf(conf_as_file, sizeof(conf_as_file), "%s/conf", instdir); + int trap_fd = open(conf_as_file, O_WRONLY | O_CREAT | O_TRUNC, 0600); + TEST_ASSERT_TRUE_MESSAGE(trap_fd >= 0, "must be able to plant the conf-as-file trap"); + close(trap_fd); + + uint8_t payload[16]; + memset(payload, 0xCD, sizeof(payload)); + uint8_t sha[32]; + SHA256(payload, sizeof(payload), sha); + + repl_config_push_req_t rcpr; + memset(&rcpr, 0, sizeof(rcpr)); + rcpr.version_tag = 0x5353; + rcpr.raw_bytes = payload; + rcpr.raw_bytes_len = sizeof(payload); + rcpr.raw_sha256 = sha; + + xce_request_t req; + memset(&req, 0, sizeof(req)); + req.body_which = Request_body_replconfigpushrequestmsg; + req.body.replconfigpushrequestmsg = &rcpr; + + g_cpr21_hook_called = 0; + config_push_reply_send_hook = cpr21_reply_capture; + + int rc = handle_repl_config_push(c, /*ep*/NULL, &req); + + config_push_reply_send_hook = NULL; /* uninstall before any assertion can fail */ + + TEST_ASSERT_TRUE_MESSAGE(rc != 0, + "the conf-as-file trap must make conf_save_config fail (rc != 0)"); + TEST_ASSERT_TRUE_MESSAGE(g_cpr21_hook_called, + "raft-adapter-conformance 2.3: a conf_save_config failure must send " + "an explicit ReplConfigPushReply, not silence it entirely"); + TEST_ASSERT_EQUAL_INT_MESSAGE(0, g_cpr21_hook_accepted, + "the reply for a conf_save_config failure must carry accepted=0"); + TEST_ASSERT_EQUAL_UINT64(13, g_cpr21_hook_term); + + t43_free_myconf(c); + t42_teardown(c); + char cmd[512]; + snprintf(cmd, sizeof(cmd), "rm -rf %s", tmp); + system(cmd); + printf("test_config_push_save_failure_sends_explicit_reject_reply: PASS\n"); +} + +/* raft-adapter-conformance task 2.3 (Req 2.2, 2.3, 2.5, 7.5): the + * `-EAGAIN`-from-config_activate_committed activation-defer branch must + * still send accepted=1 -- activation-deferred is NOT a rejection (the + * bytes WERE saved out-of-band successfully; only the separate, + * committed-marker-gated activation step is deferred). Fixture mirrors + * test_push_path_mismatch_does_not_preactivate (config-upgrade-snapshot + * task 4.3 remediation r1) but drives the REAL handle_repl_config_push + * entry point end-to-end instead of calling config_activate_committed + * directly, and observes the reply via the send-hook installed by task + * 2.1. */ +static void test_config_push_eagain_activation_deferred_still_sends_accepted(void) +{ + char tmp[256]; + strcpy(tmp, "/tmp/xce_cr23_eagain_XXXXXX"); + TEST_ASSERT_NOT_NULL(mkdtemp(tmp)); + + cluster_t *c = t42_make_cluster(tmp); + TEST_ASSERT_NOT_NULL(c); + t42_make_leader(c, /*term*/14, /*n_peers*/1); + TEST_ASSERT_EQUAL_INT(0, + commit_engine_init(&c->commit, &c->persist, 1, 8)); + repl_set_commit_engine(&c->persist.repl, &c->commit); + t43_attach_myconf(c, tmp); + + /* A committed marker references blob B (sha B) -- the config the + * cluster agreed to, whose bytes have NOT yet arrived here. */ + size_t blenB = 0; + uint8_t *bytesB = t43_make_config_blob(&blenB); + bytesB[blenB - 1] ^= 0x5A; /* perturb -> distinct sha */ + uint8_t shaB[32]; + SHA256(bytesB, blenB, shaB); + uint64_t tagB; { uint64_t t; memcpy(&t, shaB, 8); tagB = be64toh(t); } + t43_commit_marker(c, tagB, shaB); + free(bytesB); + + /* The push delivers blob A -- a DIFFERENT config than the committed + * marker references. conf_save_config succeeds (the transit sha256 + * verification is self-consistent), but config_activate_committed() + * then defers with -EAGAIN because blob A doesn't hash-verify against + * the committed marker. */ + size_t blenA = 0; + uint8_t *bytesA = t43_make_config_blob(&blenA); + uint8_t shaA[32]; + SHA256(bytesA, blenA, shaA); + TEST_ASSERT_FALSE(memcmp(shaA, shaB, 32) == 0); + + repl_config_push_req_t rcpr; + memset(&rcpr, 0, sizeof(rcpr)); + { uint64_t t; memcpy(&t, shaA, 8); rcpr.version_tag = be64toh(t); } + rcpr.raw_bytes = bytesA; + rcpr.raw_bytes_len = blenA; + rcpr.raw_sha256 = shaA; + + xce_request_t req; + memset(&req, 0, sizeof(req)); + req.body_which = Request_body_replconfigpushrequestmsg; + req.body.replconfigpushrequestmsg = &rcpr; + + g_cpr21_hook_called = 0; + config_push_reply_send_hook = cpr21_reply_capture; + + int rc = handle_repl_config_push(c, /*ep*/NULL, &req); + + config_push_reply_send_hook = NULL; /* uninstall before any assertion can fail */ + free(bytesA); + + TEST_ASSERT_EQUAL_INT(0, rc); + /* Still fenced -- proves the -EAGAIN branch was genuinely taken, not + * the plain-success branch (which would clear the fence). */ + TEST_ASSERT_EQUAL_INT(1, config_serve_fenced(c)); + TEST_ASSERT_TRUE_MESSAGE(g_cpr21_hook_called, + "raft-adapter-conformance 2.3: the -EAGAIN activation-defer path " + "must still send an explicit ReplConfigPushReply"); + TEST_ASSERT_EQUAL_INT_MESSAGE(1, g_cpr21_hook_accepted, + "raft-adapter-conformance 2.5/7.5: activation-deferred (-EAGAIN) is " + "NOT a rejection -- the reply must carry accepted=1"); + TEST_ASSERT_EQUAL_UINT64(14, g_cpr21_hook_term); + + t43_free_myconf(c); + commit_engine_fini(&c->commit); + t42_teardown(c); + char cmd[512]; + snprintf(cmd, sizeof(cmd), "rm -rf %s", tmp); + system(cmd); + printf("test_config_push_eagain_activation_deferred_still_sends_accepted: PASS\n"); +} + +/* raft-adapter-conformance task 2.3 (Req 7.4, 7.5): task 2.2's own test + * (test_config_push_reply_higher_term_adopts_and_steps_down, above) only + * exercised the term-adoption check on a REJECTED (accepted=0) reply. + * Req 7.4/7.5 require the term check to fire "regardless of accept/reject" + * -- this closes that gap by driving the identical real dispatch path + * (myreq_handler_for_test) with accepted=1 instead. */ +static void test_config_push_reply_higher_term_adopts_on_accept(void) +{ + char tmp[256]; + strcpy(tmp, "/tmp/xce_cr23_termacc_XXXXXX"); + TEST_ASSERT_NOT_NULL(mkdtemp(tmp)); + + cluster_t *c = t42_make_cluster(tmp); + TEST_ASSERT_NOT_NULL(c); + + atomic_store(&c->ha.role, CTRL_STANDBY); + atomic_store(&c->ha.term, 5); + ha_init_raft(&c->ha, c, /*n_peers*/3); + c->ha.raft.term = 5; + c->ha.raft.role = RAFT_LEADER; + + endpoint_t ep; + memset(&ep, 0, sizeof(ep)); + ep.owner = c; + + /* Accept (accepted=1) carrying a higher term (9 > 5): the term-adoption + * check must fire on the ACCEPT branch exactly as it does on reject. */ + io_packet_t *pkt = + cpr22_build_config_push_reply_pkt(/*accepted*/1, + /*version_tag*/0xBEEF, + /*term*/9); + TEST_ASSERT_NOT_NULL(pkt); + + int rc = myreq_handler_for_test(&ep, pkt); + TEST_ASSERT_EQUAL_INT(0, rc); + + TEST_ASSERT_EQUAL_UINT64_MESSAGE(9, c->ha.raft.term, + "raft-adapter-conformance 7.4: a config-push ACCEPT reply's higher " + "term must also be adopted via raft_on_higher_term_observed"); + TEST_ASSERT_NOT_EQUAL_INT_MESSAGE(RAFT_LEADER, c->ha.raft.role, + "raft-adapter-conformance 7.5: leadership held at the lower term " + "must be stepped down once a higher term is observed, even on the " + "accept branch"); + + /* pkt is already fully freed at this point (myreq_handler_for_test -> + * xce_decode() unconditionally frees it) -- see the ownership note on + * test_config_push_reply_higher_term_adopts_and_steps_down above + * (bug-1482). Do NOT free pkt here. */ + + t42_teardown(c); + char cmd[512]; + snprintf(cmd, sizeof(cmd), "rm -rf %s", tmp); + system(cmd); + printf("test_config_push_reply_higher_term_adopts_on_accept: PASS\n"); +} + #endif /* XCE_TESTING */ /* ── raw capnp shims (Task A) ───────────────────── */ @@ -2219,6 +4494,93 @@ static void test_wal_catchup_entry_error_skipped_no_crash(void) printf("test_wal_catchup_entry_error_skipped_no_crash: PASS\n"); } +/* bug-1479: a term-carrying entry that fails logOk (forward gap / genuine + * (term,lsn) conflict) must now send a NACK {success=0} back to the primary, + * not silence the reject entirely -- otherwise the primary's NACK-handling + * (ha_raft_on_repl_nack, ha.c) can never engage, no matter how correct it is, + * because nothing ever produces the reply it is waiting for. This is exactly + * the live gap the config-upgrade soak's force-elect rotation exposed: a + * standby that fell behind (a genuine forward gap against its empty log) + * looped rejecting the identical re-broadcast entry forever, with no NACK + * ever reaching the primary to trigger backoff + catch-up. + * + * ha_wal_ack_send_hook (ha.h, XCE_TESTING) captures the {term, lsn, success} + * that ha_send_wal_ack_reply_ex would have sent, without a live endpoint. */ +static uint64_t g_b1479_hook_term; +static uint64_t g_b1479_hook_lsn; +static int g_b1479_hook_success; +static int g_b1479_hook_called; + +static void b1479_wal_ack_capture(uint64_t term, uint64_t lsn, int success) +{ + g_b1479_hook_called = 1; + g_b1479_hook_term = term; + g_b1479_hook_lsn = lsn; + g_b1479_hook_success = success; +} + +static void test_bug1479_ae_reject_sends_nack_not_silence(void) +{ + char tmp[256]; + strcpy(tmp, "/tmp/xce_cr_b1479_XXXXXX"); + TEST_ASSERT_NOT_NULL(mkdtemp(tmp)); + + cluster_t *c = t42_make_cluster(tmp); + TEST_ASSERT_NOT_NULL(c); + + /* Bring the node up as a raft FOLLOWER at term 3 with an EMPTY log + * (log_len=0) -- mirrors t_bug1475_make_follower further below in this + * file (that fixture is defined later; duplicated inline here to avoid + * an ordering dependency). */ + atomic_store(&c->ha.role, CTRL_STANDBY); + atomic_store(&c->ha.term, 3); + ha_init_raft(&c->ha, c, /*n_peers*/3); + c->ha.raft.term = 3; + c->ha.raft.role = RAFT_FOLLOWER; + TEST_ASSERT_EQUAL_UINT64(0, c->ha.raft.log_len); + + g_b1479_hook_called = 0; + ha_wal_ack_send_hook = b1479_wal_ack_capture; + + /* A term-carrying entry at lsn=5 whose prev_log_index=4 is a forward gap + * against this node's empty log (0 < 4) -- logOk MUST reject it. */ + wal_catchup_entry_t inner; + memset(&inner, 0, sizeof(inner)); + inner.lsn = 5; + inner.term = 3; + inner.prev_log_index = 4; + inner.prev_log_term = 3; + inner.entry_type = (uint8_t)WAL_JOB_UPDATE; + + wal_catchup_entry_t *sub_arr[1] = { &inner }; + wal_catchup_entry_t outer; + memset(&outer, 0, sizeof(outer)); + outer.n_entries = 1; + outer.entries = sub_arr; + + int rc = ha_apply_wal_catchup_entry(&c->ha, &c->persist, &outer, + /*ep*/NULL, c); + + ha_wal_ack_send_hook = NULL; /* uninstall before any assertion can fail */ + + TEST_ASSERT_EQUAL_INT(0, rc); /* reject, not a hard error */ + TEST_ASSERT_EQUAL_UINT64(0, c->ha.raft.log_len); /* nothing was accepted */ + + TEST_ASSERT_TRUE_MESSAGE(g_b1479_hook_called, + "bug-1479: an AppendEntries reject must send a WalAckReply " + "(a NACK), not silence it entirely"); + TEST_ASSERT_EQUAL_INT_MESSAGE(0, g_b1479_hook_success, + "the reply for a rejected entry must carry success=0"); + TEST_ASSERT_EQUAL_UINT64(3, g_b1479_hook_term); + TEST_ASSERT_EQUAL_UINT64(5, g_b1479_hook_lsn); + + t42_teardown(c); + char cmd[512]; + snprintf(cmd, sizeof(cmd), "rm -rf %s", tmp); + system(cmd); + printf("test_bug1479_ae_reject_sends_nack_not_silence: PASS\n"); +} + /* Test 2.1-C: NULL entry is handled gracefully (null guard) */ static void test_wal_catchup_entry_null_entry_no_crash(void) { @@ -2912,17 +5274,32 @@ static int capture_all_entries_wal_stream_hook(endpoint_t *ep, xce_request_t *re * checkpoint LSN; the live index must match"), never a logical Raft log * entry, and never sent on the live broadcast path either * (persist_wal_write_replicated rejects type==WAL_CHECKPOINT with -EINVAL). - * A standby receiving one gets stuck retrying the same LSN forever. * * Fixture: LSN [1..5], LSN 3 is a checkpoint marker (consumes a real LSN slot, * exactly like a live checkpoint firing mid-range). Streaming standby_lsn=0, - * committed_lsn=5 must emit exactly 4 real entries (1,2,4,5), never lsn=3, and - * the entry after the gap (lsn=4) must chain prev_log_index=2 (the last REAL - * entry before the gap), not 3. + * committed_lsn=5 must emit exactly 4 real entries (1,2,4,5), never lsn=3. * - * RED before the fix: the streamer builds/sends a catchup_entry for every - * hdr.type in range with no filter, so lsn=3/type=WAL_CHECKPOINT is included - * and lsn=4's prev_log_index is 3. + * bug-1475 (UPDATED, supersedes the original assertion): the entry after the + * gap (lsn=4) must now chain prev_log_index=3 -- the checkpoint's OWN lsn -- + * NOT 2 (the last real entry before it). The original assertion here (prev_ + * log_index=2, "not the skipped marker's lsn=3") encoded the OLD, DEFECTIVE + * design: a receiving standby that has itself already applied the same + * committed WAL_CONFIG_MARKER independently writes its OWN local checkpoint + * at the identical LSN (persist_write_checkpoint_marker runs deterministically + * on every member that applies the marker's commit, not just the sender), so + * the checkpoint's LSN is a real, HELD position on both sides -- not a gap to + * skip past. Never advancing the tracker across it left every subsequent + * prev_log_index permanently one below the receiver's true log length, + * producing a permanent post-checkpoint catch-up stall (ae_reject_logmismatch + * forever, zero progress every heartbeat) -- root-caused and fixed as part of + * bug-1475; see ha_apply_term_entry_via_library's bug-1475 fix (ha.c) for the + * matching receive-side co-tracking half of this fix, and + * test_bug1475_catchup_survives_midstream_checkpoint below for the full + * end-to-end (send+receive) regression proof. + * + * RED before the ORIGINAL bug (pre-existing, already fixed): the streamer + * built/sent a catchup_entry for every hdr.type with no filter at all, so + * lsn=3/type=WAL_CHECKPOINT itself was shipped as a real entry. */ static void test_wal_stream_skips_checkpoint_marker(void) { @@ -2955,15 +5332,20 @@ static void test_wal_stream_skips_checkpoint_marker(void) "no streamed entry may carry entry_type==WAL_CHECKPOINT"); } - /* Entries in order must be lsn 1,2,4,5 with lsn=4's prev_log_index=2 - * (the last real entry before the checkpoint gap, not the marker's lsn 3). */ + /* Entries in order must be lsn 1,2,4,5. */ TEST_ASSERT_EQUAL_UINT64_MESSAGE(1, g_cap_ckpt_lsn[0], "entry 0 must be lsn=1"); TEST_ASSERT_EQUAL_UINT64_MESSAGE(2, g_cap_ckpt_lsn[1], "entry 1 must be lsn=2"); TEST_ASSERT_EQUAL_UINT64_MESSAGE(4, g_cap_ckpt_lsn[2], "entry 2 must be lsn=4 (lsn=3 skipped)"); TEST_ASSERT_EQUAL_UINT64_MESSAGE(5, g_cap_ckpt_lsn[3], "entry 3 must be lsn=5"); - TEST_ASSERT_EQUAL_UINT64_MESSAGE(2, g_cap_ckpt_prev_idx[2], - "lsn=4 must chain prev_log_index=2 (the last real entry before the " - "checkpoint gap), not the skipped marker's lsn=3"); + /* bug-1475: lsn=4 must chain prev_log_index=3 -- the checkpoint's OWN lsn, + * which is a real HELD position on any receiver that independently + * applied the same committed marker -- NOT 2 (the stale, pre-fix value + * that permanently wedged catch-up one entry later; see the updated + * fixture doc comment above and test_bug1475_catchup_survives_ + * midstream_checkpoint for the full send+receive proof). */ + TEST_ASSERT_EQUAL_UINT64_MESSAGE(3, g_cap_ckpt_prev_idx[2], + "bug-1475: lsn=4 must chain prev_log_index=3 (the checkpoint's own " + "lsn, a real held position on both sides), not the stale lsn=2"); xce_wal_stream_request_hook = NULL; @@ -2973,6 +5355,216 @@ static void test_wal_stream_skips_checkpoint_marker(void) printf("test_wal_stream_skips_checkpoint_marker: PASS\n"); } +/* ══════════════════════════════════════════════════════════════════════════ + * bug-1475 — END-TO-END regression: a standby must NOT permanently stall + * catching up across a mid-stream WAL_CHECKPOINT. + * + * This drives all THREE parts of the fix together through the REAL production + * send+receive path — not just the sender's prev_log_index computation + * (already pinned above) in isolation: + * - SEND side (config_repl.c, ha_stream_wal_to_standby): the tracker now + * advances across a skipped WAL_CHECKPOINT instead of freezing one entry + * behind. + * - RECEIVE side (ha.c, ha_apply_term_entry_via_library): JIT-resyncs + * ha->raft.log_len from persist_durable_floor() before consuming each AE + * — mirroring ha_sync_raft_log_from_recovery's own boot-time computation, + * but applied live, on the same single AE-receive call path (no new lock, + * no cross-thread mutation) — so a receiver whose OWN local checkpoint + * write left log_len stale (bug-1466, deliberately NOT fixed at its root + * by this change) still correctly logOk-accepts the checkpoint's own lsn + * as a valid predecessor. + * - TERM-INDEX side (persist.c, record_entry_term/entry_term_locked): + * a THIRD, previously-undiscovered gap found by live instrumentation of + * THIS test after the first two fixes above still left it RED. The first + * two fixes both rely on `persist_entry_term(checkpoint_lsn)` staying + * "absent" (0) FOREVER on every member (documented design intent in both + * comments above and in persist_write_checkpoint_marker's own comment). + * That was false: record_entry_term's geometric-growth realloc zero-filled + * any skipped gap slot (e.g. the checkpoint's own, deliberately-unrecorded + * LSN), and entry_term_locked's `lsn <= term_index_count` presence check + * then read that zero-fill back as WAL_LEGACY_TERM (1), NOT absent (0), + * the INSTANT any LATER lsn was recorded and grew term_index_count past + * the gap — which happens immediately in this test (and in any live + * cluster) once the leader appends its next real entry after the + * checkpoint. This made the checkpoint LSN's "term" a TIME-DEPENDENT + * value: a fresh read right after the checkpoint returned 0 (absent, as + * designed), but the SAME read after a later entry was appended returned + * 1 — so the sender (which streams AFTER its own later entries exist) + * computed prev_log_term=1 for the entry right after the checkpoint, + * while a receiver that had not yet appended anything past its own + * checkpoint still (correctly, per design) read 0 for the same LSN — + * logOk's equality check then spuriously mismatched (0 != 1) and rejected + * forever. Fixed with a TERM_INDEX_UNSET sentinel (UINT64_MAX) that marks + * a never-explicitly-written slot as absent PERMANENTLY, independent of + * later array growth — see TERM_INDEX_UNSET's comment in persist.c for + * the full mechanism. Confirmed via real fprintf instrumentation at the + * streamer, the JIT resync, and raft.c's logOk check (added and removed + * during this investigation) that prev_log_term flipped from 0 to 1 + * exactly at the point lsn=4 was appended, before the persist.c fix; the + * same instrumentation confirmed prev_log_term=0 on both sides and + * log_ok=1 after the fix. + * + * Fixture: a REAL leader persist_t WAL [lsn=1 real, lsn=2 WAL_CHECKPOINT + * (via the real persist_checkpoint()), lsn=3 real, lsn=4 real]. A REAL + * receiver cluster_t independently applies the SAME committed prefix through + * lsn=1 and independently writes its OWN local checkpoint at lsn=2 (exactly + * mirroring persist_write_checkpoint_marker's deterministic per-member + * trigger — every member that applies a committed WAL_CONFIG_MARKER + * checkpoints at the identical LSN, not just the leader). The receiver's + * raft.log_len is left at its STALE, pre-checkpoint value (1) — the exact + * live-write-time gap bug-1466 documents (persist_write_checkpoint_marker + * bypasses raft_log_append, so log_len never advances for a checkpoint on + * its own) — this is the precondition the permanent stall needs. + * + * ha_stream_wal_to_standby streams (standby_lsn=2, committed_lsn=4] and a + * capture-and-replay hook feeds every batch into the REAL + * ha_apply_wal_catchup_entry receive entry point against the receiver — + * exactly the wire hop xce_decode → ha_apply_wal_catchup_entry performs live. + * + * RED (pre-fix, verified live during this investigation by reverting the + * persist.c term-index sentinel fix with the other two parts still in + * place): the receiver + * gets permanently stuck AT OR BEFORE the checkpoint boundary — lsn=3's + * prev_log_index is computed one below where the checkpoint actually left + * the receiver's log, so ha_apply_term_entry_via_library's accept-check + * (persist_entry_term(p, e->lsn) against the ACTUAL write position) never + * matches, no ACK is sent, and every subsequent entry's prev_log_index only + * grows further past the receiver's true (stale) log_len — ae_reject_ + * logmismatch forever, zero progress. A second stream of the IDENTICAL range + * makes IDENTICAL zero progress, proving the wedge is permanent, not a + * transient one-round lag. + * + * GREEN (post-fix): the receiver catches all the way up to lsn=4. + * ══════════════════════════════════════════════════════════════════════════ */ + +/* Bring a node up as a raft FOLLOWER at `term` (mirrors t42_make_leader, + * make_follower in test_term_safety_adapter.c — this file has no standby-role + * helper of its own yet). */ +static void t_bug1475_make_follower(cluster_t *c, uint64_t term, int n_peers) +{ + atomic_store(&c->ha.role, CTRL_STANDBY); + atomic_store(&c->ha.term, term); + ha_init_raft(&c->ha, c, n_peers); + c->ha.raft.term = term; + c->ha.raft.role = RAFT_FOLLOWER; +} + +/* Replay-into-receiver hook: feeds every streamed batch into the REAL + * ha_apply_wal_catchup_entry receive path against g_bug1475_recv, exactly as + * the wire hop (xce_decode) would on a live connection. */ +static cluster_t *g_bug1475_recv = NULL; + +static int bug1475_replay_hook(endpoint_t *ep, xce_request_t *req) +{ + (void)ep; + if (!req || !req->body.walcatchupentrymsg || !g_bug1475_recv) + return 0; + wal_catchup_entry_t *batch = + (wal_catchup_entry_t *)req->body.walcatchupentrymsg; + ha_apply_wal_catchup_entry(&g_bug1475_recv->ha, &g_bug1475_recv->persist, + batch, /*ep*/NULL, g_bug1475_recv); + return 0; +} + +static void test_bug1475_catchup_survives_midstream_checkpoint(void) +{ + char ltmp[256], rtmp[256]; + strcpy(ltmp, "/tmp/xce_cr_b1475_leader_XXXXXX"); + strcpy(rtmp, "/tmp/xce_cr_b1475_recv_XXXXXX"); + TEST_ASSERT_NOT_NULL(mkdtemp(ltmp)); + TEST_ASSERT_NOT_NULL(mkdtemp(rtmp)); + + cluster_t *leader = t42_make_cluster(ltmp); + cluster_t *recv = t42_make_cluster(rtmp); + TEST_ASSERT_NOT_NULL(leader); + TEST_ASSERT_NOT_NULL(recv); + + enum { TERM = 3 }; + t42_make_leader(leader, TERM, /*n_peers=*/3); + t_bug1475_make_follower(recv, TERM, /*n_peers=*/3); + + /* Identical prefix on both members through lsn=1. persist_wal_async is a + * raw WAL write and does not itself update raft.log_len (that only + * happens via ha_primary_log_append/raft_log_append on the real commit + * path) -- both members already correctly hold index 1 (e.g. from a + * prior, successful AE exchange this test does not need to re-simulate), + * so both are seeded here to match. */ + persist_set_term(&leader->persist, TERM); + TEST_ASSERT_EQUAL_INT(0, + persist_wal_async(&leader->persist, WAL_JOB_UPDATE, NULL, 0)); /* lsn=1 */ + leader->ha.raft.log_len = 1; + persist_set_term(&recv->persist, TERM); + TEST_ASSERT_EQUAL_INT(0, + persist_wal_async(&recv->persist, WAL_JOB_UPDATE, NULL, 0)); /* lsn=1 */ + recv->ha.raft.log_len = 1; + + /* Each member independently checkpoints at lsn=2 -- the SAME deterministic + * side effect persist_checkpoint_marker_triggered fires on every member + * that applies a committed WAL_CONFIG_MARKER, not just the leader. Force a + * synchronous flush right after so persist_durable_floor() (which the + * ha.c bug-1475 fix reads) reflects it immediately rather than waiting on + * the background fsync_worker's own timer (cfg.wal_sync_ms=5000). */ + TEST_ASSERT_EQUAL_INT(0, persist_checkpoint(&leader->persist)); /* lsn=2 */ + TEST_ASSERT_EQUAL_INT(0, persist_flush(&leader->persist)); + TEST_ASSERT_EQUAL_INT(0, persist_checkpoint(&recv->persist)); /* lsn=2 */ + TEST_ASSERT_EQUAL_INT(0, persist_flush(&recv->persist)); + + /* bug-1466 (unfixed, deliberately NOT touched by this fix): the checkpoint + * write bypassed raft_log_append on BOTH members, so log_len stayed at 1 + * on both even though current_lsn moved to 3 -- exactly the precondition + * the live permanent stall needs. */ + TEST_ASSERT_EQUAL_UINT64(1, leader->ha.raft.log_len); + TEST_ASSERT_EQUAL_UINT64(1, recv->ha.raft.log_len); + TEST_ASSERT_EQUAL_UINT64(3, (uint64_t)leader->persist.current_lsn); + TEST_ASSERT_EQUAL_UINT64(3, (uint64_t)recv->persist.current_lsn); + + /* Leader appends two more REAL entries after the checkpoint. */ + persist_set_term(&leader->persist, TERM); + TEST_ASSERT_EQUAL_INT(0, + persist_wal_async(&leader->persist, WAL_JOB_UPDATE, NULL, 0)); /* lsn=3 */ + TEST_ASSERT_EQUAL_INT(0, + persist_wal_async(&leader->persist, WAL_JOB_UPDATE, NULL, 0)); /* lsn=4 */ + atomic_store_explicit(&leader->persist.committed_lsn, 4, + memory_order_release); + + /* Drive the REAL catch-up streamer -> REAL receive path. standby_lsn=2: + * this receiver already durably holds through the checkpoint's own lsn. */ + g_bug1475_recv = recv; + xce_wal_stream_request_hook = bug1475_replay_hook; + int rc = ha_stream_wal_to_standby(/*ep=*/NULL, leader->persist.wal_path, + &leader->persist, /*leader_term=*/TERM, + /*standby_lsn=*/2, /*committed_lsn=*/4); + xce_wal_stream_request_hook = NULL; + g_bug1475_recv = NULL; + TEST_ASSERT_EQUAL_INT_MESSAGE(0, rc, "ha_stream_wal_to_standby failed"); + + uint64_t applied = atomic_load_explicit(&recv->ha.applied_lsn, + memory_order_acquire); + TEST_ASSERT_EQUAL_UINT64_MESSAGE(4, applied, + "bug-1475: the standby must catch all the way up to lsn=4 across the " + "mid-stream checkpoint, not stall permanently at/before it"); + TEST_ASSERT_EQUAL_UINT64(4, recv->ha.raft.log_len); + TEST_ASSERT_EQUAL_UINT64(TERM, persist_entry_term(&recv->persist, 4)); + + /* A SECOND identical stream (the real heartbeat-driven retry) must be a + * clean no-op / re-confirmation, never regress applied_lsn -- proving + * this is genuine convergence, not a one-round fluke. */ + g_bug1475_recv = recv; + xce_wal_stream_request_hook = bug1475_replay_hook; + rc = ha_stream_wal_to_standby(/*ep=*/NULL, leader->persist.wal_path, + &leader->persist, /*leader_term=*/TERM, + /*standby_lsn=*/4, /*committed_lsn=*/4); + xce_wal_stream_request_hook = NULL; + g_bug1475_recv = NULL; + TEST_ASSERT_EQUAL_INT(0, rc); + TEST_ASSERT_EQUAL_UINT64(4, atomic_load_explicit(&recv->ha.applied_lsn, + memory_order_acquire)); + + t42_teardown(leader); + t42_teardown(recv); + printf("test_bug1475_catchup_survives_midstream_checkpoint: PASS\n"); +} + /* * bug-1028 — the catch-up streamer must source each streamed entry's term and * the AppendEntries prev_log_term from the AUTHORITATIVE per-LSN term index @@ -3123,6 +5715,219 @@ static void test_snapshot_transfer_two_chunks(void) printf("test_snapshot_transfer_two_chunks: PASS\n"); } +/* ══════════════════════════════════════════════════════════════════════════ + * bug-1475 Finding 2 (coordinator review, 2026-07-27/28): the SAME permanent + * catch-up wedge bug-1475 fixed for WAL-streaming catch-up, reachable + * instead via the SNAPSHOT-INSTALL path (HA_REPL_SEND_SNAPSHOT — dispatched + * whenever a standby has fallen too far behind for incremental streaming, a + * live, common path, not dead code). + * + * ha_snapshot_do_send (ha.c) computes checkpoint_term = persist_entry_term( + * leader, checkpoint_lsn) — which, thanks to bug-1475's TERM_INDEX_UNSET + * fix, is now PERMANENTLY 0 (absent) for any real checkpoint LSN + * (persist_write_checkpoint_marker never records a term for its own entry, + * by design). Before THIS fix, ha_handle_snapshot_chunk's + * persist_reconcile_checkpoint_term(p, checkpoint_lsn, checkpoint_term) + * wrote that 0 RAW into the term index via an EXPLICIT record_entry_term + * call (not a growth-fill) — so entry_term_locked's legacy-0 rule read it + * back as WAL_LEGACY_TERM(1), NOT absent, permanently diverging from the + * leader's own permanently-absent(0) value for the IDENTICAL LSN. A + * subsequent AppendEntries whose prev_log_index==checkpoint_lsn (the entry + * immediately following it) then mismatched logOk (0 != 1) forever. + * + * RED (pre-fix, verified by temporarily reverting persist_reconcile_ + * checkpoint_term's TERM_INDEX_UNSET substitution): the receiver's + * checkpoint-boundary term reads back 1 (WAL_LEGACY_TERM), not 0, and the + * subsequent AppendEntries is rejected — applied_lsn never reaches 3. + * GREEN (post-fix): the receiver's checkpoint-boundary term reads back 0 + * (absent, matching the leader), and the subsequent AppendEntries is + * accepted. + * ══════════════════════════════════════════════════════════════════════════ */ + +static cluster_t *g_bug1475f2_recv = NULL; + +static int bug1475f2_snapshot_replay_hook(endpoint_t *ep, xce_request_t *req) +{ + (void)ep; + if (!req || !req->body.snapshottransfermsg || !g_bug1475f2_recv) + return 0; + snapshot_transfer_t *chunk = + (snapshot_transfer_t *)req->body.snapshottransfermsg; + return ha_handle_snapshot_chunk(&g_bug1475f2_recv->ha, + &g_bug1475f2_recv->persist, + g_bug1475f2_recv->persist.snap_path, + chunk, chunk->raw_payload, + chunk->raw_payload_len); +} + +static void test_bug1475_finding2_snapshot_install_checkpoint_term_absent(void) +{ + char ltmp[256], rtmp[256]; + strcpy(ltmp, "/tmp/xce_cr_b1475f2_leader_XXXXXX"); + strcpy(rtmp, "/tmp/xce_cr_b1475f2_recv_XXXXXX"); + TEST_ASSERT_NOT_NULL(mkdtemp(ltmp)); + TEST_ASSERT_NOT_NULL(mkdtemp(rtmp)); + + cluster_t *leader = t42_make_cluster(ltmp); + cluster_t *recv = t42_make_cluster(rtmp); + TEST_ASSERT_NOT_NULL(leader); + TEST_ASSERT_NOT_NULL(recv); + + extern int (*xce_snapshot_chunk_hook)(endpoint_t *, xce_request_t *); + extern int ha_send_snapshot_to_standby(endpoint_t *, const char *, + uint64_t, uint64_t); + + enum { TERM = 5 }; + t42_make_leader(leader, TERM, /*n_peers=*/3); + t_bug1475_make_follower(recv, TERM, /*n_peers=*/3); + /* ha_handle_snapshot_chunk takes ha->lock directly; t42_make_cluster / + * ha_init_raft never call pthread_mutex_init on it (only the AE-receive + * path is exercised by the OTHER bug-1475 test, which never locks it) — + * initialize it explicitly here rather than relying on a zeroed mutex + * happening to behave like PTHREAD_MUTEX_INITIALIZER. */ + pthread_mutex_init(&recv->ha.lock, NULL); + + /* Leader: a real entry at lsn=1, then a REAL checkpoint at lsn=2 via + * persist_checkpoint -> persist_write_checkpoint_marker (the exact + * production path — not a synthetic marker). + * + * p->checkpoint_lsn is NOT the WAL_CHECKPOINT entry's own physical lsn — + * persist_checkpoint() (the general/periodic form ha_snapshot_do_send + * actually calls) labels the snapshot with last_applied_lsn, read + * immediately AFTER persist_write_checkpoint_marker has already + * consumed the next lsn slot for the checkpoint itself. In a + * continuously-active system checkpoint_lsn is usually one BELOW the + * checkpoint's own physical lsn (the last real entry applied so far); + * Finding 2 requires the specific (real, reachable) quiescent-state + * timing where the apply pump has already walked all the way through + * and landed exactly ON the checkpoint's own lsn (persist_apply_pump_run + * advances last_applied_lsn one lsn at a time, INCLUDING a no-op pass + * over a WAL_CHECKPOINT slot, before this snapshot-send cycle runs) — + * e.g. right after a config upgrade with no immediate follow-up + * activity. Seed that precondition directly (deterministic; the real + * race depends on independent apply-pump timing this test does not + * need to reproduce) so persist_checkpoint()'s OWN checkpoint_lsn + * coincides with the checkpoint entry's own un-recorded lsn — exactly + * the case where persist_entry_term(checkpoint_lsn) reads genuinely + * absent. */ + persist_set_term(&leader->persist, TERM); + TEST_ASSERT_EQUAL_INT(0, + persist_wal_async(&leader->persist, WAL_JOB_UPDATE, NULL, 0)); /* lsn=1 */ + TEST_ASSERT_EQUAL_UINT64(2, (uint64_t)leader->persist.current_lsn); + atomic_store_explicit(&leader->persist.last_applied_lsn, 2, + memory_order_release); + TEST_ASSERT_EQUAL_INT(0, persist_checkpoint(&leader->persist)); /* lsn=2 */ + TEST_ASSERT_EQUAL_INT(0, persist_flush(&leader->persist)); + TEST_ASSERT_EQUAL_UINT64_MESSAGE(2, leader->persist.checkpoint_lsn, + "precondition: checkpoint_lsn must coincide with the checkpoint " + "entry's own physical lsn for this test to exercise Finding 2 " + "(otherwise it would read a real, non-absent term instead)"); + + /* Leader appends one more real entry AFTER the checkpoint — mirrors the + * real timing that exposed Finding 2 (persist_entry_term(checkpoint_lsn) + * read right after the checkpoint vs. after later growth exists). */ + persist_set_term(&leader->persist, TERM); + TEST_ASSERT_EQUAL_INT(0, + persist_wal_async(&leader->persist, WAL_JOB_UPDATE, NULL, 0)); /* lsn=3 */ + + /* Precondition: exactly what ha_snapshot_do_send's real computation + * would read for the wire — genuinely absent (0), permanently, even + * after later growth (TERM_INDEX_UNSET's whole point). */ + uint64_t checkpoint_term = + persist_entry_term(&leader->persist, leader->persist.checkpoint_lsn); + TEST_ASSERT_EQUAL_UINT64_MESSAGE(0, checkpoint_term, + "precondition: a real checkpoint LSN's term reads absent (0) on the " + "sender, even after later entries exist — the exact value " + "ha_snapshot_do_send would put on the wire"); + + /* Drive the REAL snapshot send -> receive path: ha_send_snapshot_to_standby + * chunks the on-disk snapshot file (written by persist_checkpoint above) + * and stamps checkpoint_term on every chunk; the capture-and-replay hook + * feeds each chunk into the REAL ha_handle_snapshot_chunk on the + * receiver, exactly the wire hop a live transfer performs. */ + g_bug1475f2_recv = recv; + xce_snapshot_chunk_hook = bug1475f2_snapshot_replay_hook; + int rc = ha_send_snapshot_to_standby(/*ep=*/NULL, leader->persist.snap_path, + leader->persist.checkpoint_lsn, + checkpoint_term); + xce_snapshot_chunk_hook = NULL; + g_bug1475f2_recv = NULL; + TEST_ASSERT_EQUAL_INT_MESSAGE(0, rc, "ha_send_snapshot_to_standby failed"); + TEST_ASSERT_EQUAL_UINT64(leader->persist.checkpoint_lsn, + recv->persist.checkpoint_lsn); + + /* The receiver must reconcile the checkpoint boundary LSN's term to + * match the leader's — genuinely absent (0), NOT WAL_LEGACY_TERM(1). */ + TEST_ASSERT_EQUAL_UINT64_MESSAGE(0, + persist_entry_term(&recv->persist, leader->persist.checkpoint_lsn), + "bug-1475 Finding 2: the receiver's checkpoint-boundary term must " + "reconcile to absent (0), matching the leader's permanently-absent " + "value for the SAME lsn — NOT get reinterpreted as " + "WAL_LEGACY_TERM(1) by persist_reconcile_checkpoint_term's " + "record_entry_term(..., 0) call"); + + /* Isolate Finding 2's term-index concern from two OTHER, SEPARATE, + * pre-existing (unchanged by this fix) mechanics this test is not about: + * + * 1. ha_handle_snapshot_chunk does not itself resync ha->raft.log_len + * (only ha_apply_term_entry_via_library's JIT resync does, on the + * NEXT AE) — set it directly to the checkpoint's own lsn here, the + * value a real deployment reaches once durable_lsn catches up (or a + * later boot-reseed runs). + * 2. load_snapshot() sets p->current_lsn = stored_lsn (the checkpoint's + * OWN lsn), NOT stored_lsn + 1 — confirmed via direct instrumentation + * (current_lsn read back as 2, matching checkpoint_lsn, immediately + * after this install). persist_wal_write_replicated's forward-gap + * guard (lsn > current_lsn -> EAGAIN) would then reject ANY entry at + * checkpoint_lsn+1 regardless of term, confounding this test's + * specific term question. Whether that current_lsn convention + * correctly bridges into the next live catch-up cycle in production + * is a DIFFERENT, pre-existing question this test does not answer — + * flagged here, not fixed (out of Finding 2's scope: the coordinator's + * review identified a term(0-vs-1) mismatch specifically, not a + * current_lsn contiguity gap). Bypass it directly so only the term + * question is under test. */ + recv->ha.raft.log_len = leader->persist.checkpoint_lsn; + recv->persist.current_lsn = leader->persist.checkpoint_lsn + 1; + + /* Drive a REAL subsequent AppendEntries whose prev_log_index is the + * checkpoint's own LSN — the entry immediately following it. */ + wal_catchup_entry_t sub; + memset(&sub, 0, sizeof(sub)); + sub.lsn = 3; + sub.entry_type = WAL_JOB_UPDATE; + sub.term = TERM; + sub.prev_log_index = leader->persist.checkpoint_lsn; /* == 2 */ + sub.prev_log_term = checkpoint_term; /* == 0, absent */ + sub.leader_current_term = TERM; + + wal_catchup_entry_t *sub_arr[1] = { &sub }; + wal_catchup_entry_t batch; + memset(&batch, 0, sizeof(batch)); + batch.n_entries = 1; + batch.entries = sub_arr; + batch.term = TERM; + batch.prev_log_index = sub.prev_log_index; + batch.prev_log_term = sub.prev_log_term; + + rc = ha_apply_wal_catchup_entry(&recv->ha, &recv->persist, &batch, + /*ep*/NULL, recv); + TEST_ASSERT_EQUAL_INT(0, rc); + + TEST_ASSERT_EQUAL_UINT64_MESSAGE(3, + atomic_load_explicit(&recv->ha.applied_lsn, memory_order_acquire), + "bug-1475 Finding 2: the standby must accept the AppendEntries " + "immediately following the checkpoint boundary after a snapshot " + "install, not permanently reject it (ae_reject_logmismatch) due to " + "a term(0) vs term(1) mismatch at the checkpoint LSN"); + TEST_ASSERT_EQUAL_UINT64(TERM, persist_entry_term(&recv->persist, 3)); + + pthread_mutex_destroy(&recv->ha.lock); + t42_teardown(leader); + t42_teardown(recv); + printf("test_bug1475_finding2_snapshot_install_checkpoint_term_absent: PASS\n"); +} + static void test_snapshot_transfer_small_less_than_one_chunk(void) { char tmpdir[] = "/tmp/xcectest_snaptrans_XXXXXX"; @@ -3282,7 +6087,7 @@ static void test_snapshot_recv_two_chunks_assembles_and_renames(void) * header) but is now correctly rejected as an unrecognized * format_version. Layout (design.md "Checkpoint File Layout"): the * 57-byte legacy header (cfgref_present=0 at byte 16, so bytes 17-56 are - * unread and left zero) + format_version=1 + job_count=0 + queue_count=0 + * unread and left zero) + format_version=2 + job_count=0 + queue_count=0 * (69 bytes total), padded with zero filler out to 128 bytes to keep the * two-64-byte-chunk shape this test exercises — the padding is never * read (load_snapshot_entities stops right after the queue_count=0 @@ -3294,7 +6099,8 @@ static void test_snapshot_recv_two_chunks_assembles_and_renames(void) memcpy(body, "XCESNAP\0", 8); memcpy(body + 8, &snap_lsn, 8); /* body[16] (cfgref_present) left 0 by the memset above. */ - uint32_t fake_fmt = 1u; /* must match persist.c's SNAPSHOT_FORMAT_VERSION */ + uint32_t fake_fmt = 2u; /* must match persist.c's SNAPSHOT_FORMAT_VERSION + * (config-upgrade-snapshot task 1 bumped 1->2) */ uint32_t fake_job_count = 0u; uint32_t fake_queue_count = 0u; memcpy(body + 57, &fake_fmt, sizeof(fake_fmt)); @@ -3376,6 +6182,107 @@ static void test_snapshot_recv_two_chunks_assembles_and_renames(void) printf("test_snapshot_recv_two_chunks_assembles_and_renames: PASS\n"); } +/* config-upgrade-snapshot task 1 (Req 1.9, 5.7): SNAPSHOT_FORMAT_VERSION was + * bumped 1->2 to reserve the version for the HostAdminState/QueueAdminState + * capnp migration of the host/queue admin-state frames. A checkpoint written + * under the PRIOR format_version (1 -- the raw queue-frame layout this spec + * migrates off of) must be hard-rejected fail-loud by a binary built against + * the bumped SNAPSHOT_FORMAT_VERSION=2, never silently reinterpreted (Design + * Invariant 4; persist.c:2541's existing `fmt != SNAPSHOT_FORMAT_VERSION` + * check, unchanged logic, new constant). Same well-formed-except-for- + * format-version fixture shape as + * test_snapshot_recv_two_chunks_assembles_and_renames above, but the + * embedded format_version is pinned to the literal PRIOR value (1) + * regardless of whatever persist.c's SNAPSHOT_FORMAT_VERSION currently is — + * this is exactly the "old on-disk checkpoint, new binary" skew the version + * bump must reject. */ +static void test_snapshot_recv_old_format_version_rejected_fail_loud(void) +{ + char tmpdir[] = "/tmp/xcectest_snaprecv_oldfmt_XXXXXX"; + TEST_ASSERT_NOT_NULL(mkdtemp(tmpdir)); + + char snap_dir[512]; + snprintf(snap_dir, sizeof(snap_dir), "%s/snap", tmpdir); + TEST_ASSERT_EQUAL_INT(0, mkdir(snap_dir, 0700)); + + uint64_t snap_lsn = 200; + size_t total_size = 128; + uint8_t body[128]; + memset(body, 0, sizeof(body)); + memcpy(body, "XCESNAP\0", 8); + memcpy(body + 8, &snap_lsn, 8); + /* body[16] (cfgref_present) left 0 by the memset above. */ + uint32_t old_fmt = 1u; /* the pre-migration raw queue-frame layout -- + * deliberately NOT persist.c's current + * SNAPSHOT_FORMAT_VERSION */ + uint32_t fake_job_count = 0u; + uint32_t fake_queue_count = 0u; + memcpy(body + 57, &old_fmt, sizeof(old_fmt)); + memcpy(body + 61, &fake_job_count, sizeof(fake_job_count)); + memcpy(body + 65, &fake_queue_count, sizeof(fake_queue_count)); + + uint8_t chunk0[64]; + uint8_t chunk1[64]; + memcpy(chunk0, body, 64); + memcpy(chunk1, body + 64, 64); + + persist_t *p = calloc(1, sizeof(persist_t)); + TEST_ASSERT_NOT_NULL(p); + persist_config_t pcfg = persist_config_defaults(); + persist_set_workdir(p, tmpdir, "ctrl-snaprecv-oldfmt"); + persist_init(p, &pcfg, NULL); + persist_start(p); + + ha_state_t ha; + snap_recv_ha_init(&ha); + + /* Chunk 0 — assembling snap.part never itself parses the body, so this + * must still succeed regardless of what format_version the bytes carry. */ + snapshot_transfer_t c0; + memset(&c0, 0, sizeof(c0)); + c0.snapshot_lsn = snap_lsn; + c0.chunk_index = 0; + c0.chunk_offset = 0; + c0.total_size = (uint64_t)total_size; + c0.is_last = 0; + + int rc = ha_handle_snapshot_chunk(&ha, p, snap_dir, &c0, chunk0, 64); + TEST_ASSERT_EQUAL_INT_MESSAGE(0, rc, "assembling a chunk never parses the body"); + + /* Chunk 1 (isLast=true) triggers rename + persist_load_snapshot — this is + * where the format-version check fires and must fail loud. */ + snapshot_transfer_t c1; + memset(&c1, 0, sizeof(c1)); + c1.snapshot_lsn = snap_lsn; + c1.chunk_index = 1; + c1.chunk_offset = 64; + c1.total_size = (uint64_t)total_size; + c1.is_last = 1; + + rc = ha_handle_snapshot_chunk(&ha, p, snap_dir, &c1, chunk1, 64); + TEST_ASSERT_TRUE_MESSAGE(rc != 0, + "a checkpoint encoded under the prior SNAPSHOT_FORMAT_VERSION must be " + "rejected fail-loud by a binary built against the bumped version, " + "never silently reinterpreted (Requirement 5.7)"); + + /* A rejected load must never advance applied_lsn (no partial/silent + * acceptance of mismatched-format bytes). */ + uint64_t got_lsn = (uint64_t)atomic_load_explicit(&ha.applied_lsn, + memory_order_acquire); + TEST_ASSERT_EQUAL_UINT64_MESSAGE(0, got_lsn, + "a rejected format-mismatched checkpoint must never advance applied_lsn"); + + ha_fini(&ha); + persist_stop(p); + persist_fini(p); + free(p); + + char cmd2[512]; + snprintf(cmd2, sizeof(cmd2), "rm -rf %s", tmpdir); + system(cmd2); + printf("test_snapshot_recv_old_format_version_rejected_fail_loud: PASS\n"); +} + /* Test 6.1: a legacy (pre-ha-entity-snapshots) position-only snapshot — * exactly the 16-byte XCESNAP magic+lsn header, no entity payload — driven * through the real receive handler end-to-end. persist_load_snapshot's @@ -3571,7 +6478,8 @@ static void test_snapshot_recv_128kb_two_chunks(void) memcpy(chunk0, "XCESNAP\0", 8); memcpy(chunk0 + 8, &snap_lsn, 8); /* chunk0[16] (cfgref_present) already 0 from calloc. */ - const uint32_t fake_fmt = 1u; /* must match persist.c's SNAPSHOT_FORMAT_VERSION */ + const uint32_t fake_fmt = 2u; /* must match persist.c's SNAPSHOT_FORMAT_VERSION + * (config-upgrade-snapshot task 1 bumped 1->2) */ memcpy(chunk0 + 57, &fake_fmt, sizeof(fake_fmt)); /* ── Chunk 0: not last ── */ @@ -3662,12 +6570,18 @@ static void test_snapshot_recv_out_of_order_chunks_assemble_correctly(void) /* 4 chunks of 64 bytes each = 256-byte body. Must be a WELL-FORMED * entity-bearing checkpoint (same reason as * test_snapshot_recv_two_chunks_assembles_and_renames above): legacy - * 57-byte header (cfgref_present=0) + format_version=1 + job_count=0 + - * queue_count=0, then filler out to 256 bytes. The filler is - * position-dependent (distinct per source byte, not per chunk) so ANY - * chunk landing at the wrong file offset is immediately detectable via - * a whole-buffer memcmp, regardless of which physical chunk a given - * structural field happens to fall in. */ + * 57-byte header (cfgref_present=0) + format_version=2 + job_count=0 + + * queue_count=0 + host_count=0 (config-upgrade-snapshot task 4 -- + * load_snapshot_entities now reads a host section after the queue + * section, so it must likewise be pinned to a well-formed 0 here rather + * than left as position-dependent filler), then filler out to 256 + * bytes. The filler is position-dependent (distinct per source byte, + * not per chunk) so ANY chunk landing at the wrong file offset is + * immediately detectable via a whole-buffer memcmp, regardless of + * which physical chunk a given structural field happens to fall in -- + * except for the 4 structural-field byte ranges explicitly overlaid + * below (fmt/job_count/queue_count/host_count), which must stay + * well-formed for the load to succeed at all. */ uint64_t snap_lsn = 400; size_t total_size = 256; uint8_t body[256]; @@ -3676,12 +6590,15 @@ static void test_snapshot_recv_out_of_order_chunks_assemble_correctly(void) memcpy(body + 8, &snap_lsn, 8); for (int i = 16; i < 256; i++) body[i] = (uint8_t)(i * 3 + 7); /* position-dependent, non-repeating */ - uint32_t fake_fmt = 1u; + uint32_t fake_fmt = 2u; /* must match persist.c's SNAPSHOT_FORMAT_VERSION + * (config-upgrade-snapshot task 1 bumped 1->2) */ uint32_t fake_job_count = 0u; uint32_t fake_queue_count = 0u; + uint32_t fake_host_count = 0u; memcpy(body + 57, &fake_fmt, sizeof(fake_fmt)); memcpy(body + 61, &fake_job_count, sizeof(fake_job_count)); memcpy(body + 65, &fake_queue_count, sizeof(fake_queue_count)); + memcpy(body + 69, &fake_host_count, sizeof(fake_host_count)); persist_t *p = calloc(1, sizeof(persist_t)); TEST_ASSERT_NOT_NULL(p); @@ -4184,6 +7101,237 @@ static void test_catchup_inline_probe_blocks_RED(void) cc_run_offload_probe(0, "test_catchup_inline_probe_blocks_RED"); } +/* ── bug-1476: concurrent load_primary_config() race on myconf->cluster_config ── + * + * load_primary_config()'s free-decode-publish sequence for + * myconf->cluster_config was completely unguarded by any lock. A live + * 3-node ASan soak (config-upgrade-snapshot task 8.9 re-verification, + * ctrl-3) caught a genuine heap-use-after-free: two concurrent + * handle_repl_config_push deliveries for the SAME standby raced two + * concurrent load_primary_config() calls on separate VTASK_LIVE_BLOCK + * workers -- one call's decode had already published a non-NULL, + * still-populating cluster_config_t* into the shared myconf->cluster_config + * field (decode_ClusterConfig_ptr calloc's *and publishes* the pointer via + * its out-parameter BEFORE decode_ClusterConfig populates the nested fields + * such as resources -- confirmed by reading + * lib/controller.capnp.c:17067-17077) while a second, concurrent invocation + * observed that same non-NULL pointer, assumed (per the single free-then- + * decode sequence) it was a prior FULLY-decoded config, and freed it out + * from under the first call's still-in-flight decode. + * + * load_primary_config_race_hook (XCE_TESTING-only, config_repl.c) lets this + * test deterministically force two REAL pthreads through that exact race + * window instead of depending on scheduler timing: thread A captures the + * config pointer it is about to retire and parks at the hook; thread B (a + * full, real, concurrent load_primary_config() call for the SAME myconf_t) + * is released to run while A is parked. + * + * RED (pre-fix, no lock): B runs to completion unblocked -- freeing the + * SAME pointer A already captured and publishing its own config. Opening + * the gate lets A retire (free) that already-freed pointer a SECOND time: a + * genuine, deterministic, ASan-catchable double-free from the identical + * missing-lock root cause the live crash exposed. (The exact + * decode_Resource_list-mid-write UAF the live trace shows additionally + * requires pausing inside the generated capnp decoder, which the fix + * deliberately avoids touching -- see the fix's own comment in + * load_primary_config; this reproduction targets the same unguarded + * read-free-decode-publish sequence and is caught by ASan the same way.) + * + * GREEN (post-fix): myconf->lock serializes the two calls end-to-end -- B + * cannot even acquire the lock (let alone reach its own retire step or + * corrupt anything) until A's whole call, hook included, returns and + * releases it. No pointer is ever freed twice, and load_primary_config (fix + * part 2) no longer decodes directly into the shared field at all, closing + * the exposure for any OTHER reader that never takes the lock. */ + +typedef struct { + pthread_mutex_t mu; + pthread_cond_t release_cv; + pthread_cond_t entered_cv; + int gate_open; + _Atomic int entered; +} lpc_gate_t; + +static lpc_gate_t g_lpc_gate; +static _Atomic int g_lpc_hook_block_next; /* 1 = the NEXT hook call should park */ + +static void lpc_gate_init(lpc_gate_t *g) +{ + pthread_mutex_init(&g->mu, NULL); + pthread_cond_init(&g->release_cv, NULL); + pthread_cond_init(&g->entered_cv, NULL); + g->gate_open = 0; + atomic_store(&g->entered, 0); +} + +static void lpc_gate_destroy(lpc_gate_t *g) +{ + pthread_mutex_destroy(&g->mu); + pthread_cond_destroy(&g->release_cv); + pthread_cond_destroy(&g->entered_cv); +} + +static void lpc_gate_open(lpc_gate_t *g) +{ + pthread_mutex_lock(&g->mu); + g->gate_open = 1; + pthread_cond_broadcast(&g->release_cv); + pthread_mutex_unlock(&g->mu); +} + +static int lpc_gate_wait_entered(lpc_gate_t *g, int timeout_ms) +{ + struct timespec deadline; + clock_gettime(CLOCK_REALTIME, &deadline); + deadline.tv_sec += timeout_ms / 1000; + deadline.tv_nsec += (long)(timeout_ms % 1000) * 1000000L; + if (deadline.tv_nsec >= 1000000000L) { deadline.tv_sec++; deadline.tv_nsec -= 1000000000L; } + + pthread_mutex_lock(&g->mu); + int rc = 0; + while (atomic_load(&g->entered) < 1) { + rc = pthread_cond_timedwait(&g->entered_cv, &g->mu, &deadline); + if (rc != 0) break; + } + int entered = atomic_load(&g->entered); + pthread_mutex_unlock(&g->mu); + return entered >= 1 ? 0 : -1; +} + +/* Fires from INSIDE load_primary_config -- holding no lock of its own under + * the OLD (pre-fix) code, or holding myconf->lock under the fixed code. + * Only the FIRST call (armed via g_lpc_hook_block_next) actually parks; + * later calls pass straight through, so thread B's own call runs unimpeded + * when it reaches this same hook (pre-fix), or never even reaches it + * (post-fix -- it blocks acquiring myconf->lock before getting this far). */ +static void lpc_race_hook(void) +{ + if (!atomic_exchange(&g_lpc_hook_block_next, 0)) + return; + + pthread_mutex_lock(&g_lpc_gate.mu); + atomic_fetch_add(&g_lpc_gate.entered, 1); + pthread_cond_broadcast(&g_lpc_gate.entered_cv); + while (!g_lpc_gate.gate_open) + pthread_cond_wait(&g_lpc_gate.release_cv, &g_lpc_gate.mu); + pthread_mutex_unlock(&g_lpc_gate.mu); +} + +typedef struct { + cluster_t *c; + _Atomic int done; + _Atomic int rc; +} lpc_thread_arg_t; + +static void *lpc_call_load_primary_config(void *arg) +{ + lpc_thread_arg_t *a = (lpc_thread_arg_t *)arg; + int rc = load_primary_config(a->c); + atomic_store(&a->rc, rc); + atomic_store(&a->done, 1); + return NULL; +} + +static void test_bug1476_concurrent_load_primary_config_no_uaf_or_double_free(void) +{ + char tmp[256]; + strcpy(tmp, "/tmp/xce_cr1476_race_XXXXXX"); + TEST_ASSERT_NOT_NULL(mkdtemp(tmp)); + + cluster_t c; + memset(&c, 0, sizeof(c)); + myconf_t *mc = t43_attach_myconf(&c, tmp); /* inits mc->lock */ + + /* conf_save_config only mkdir()s the LAST path component (workdir/name/ + * conf); unlike other t43_* fixtures this test does not call + * t42_make_cluster (which creates workdir/name via persist_init) since + * load_primary_config only touches c->myconf -- create workdir/name + * directly instead. */ + char ctrldir[300]; + snprintf(ctrldir, sizeof(ctrldir), "%s/ctrl-test", tmp); + TEST_ASSERT_EQUAL_INT(0, mkdir(ctrldir, 0700)); + + /* Establish an initial live config so BOTH racing calls exercise the + * "free the OLD config" retire step (not the first-ever-load path) -- + * matches the live crash, which happened on a standby reloading an + * ALREADY-activated config, not on first boot. */ + size_t blen0 = 0; + uint8_t *bytes0 = t43_make_config_blob(&blen0); + uint8_t sha0[32]; + SHA256(bytes0, blen0, sha0); + TEST_ASSERT_EQUAL_INT(0, conf_save_config(mc, bytes0, blen0, sha0)); + free(bytes0); + TEST_ASSERT_EQUAL_INT(0, load_primary_config(&c)); + TEST_ASSERT_NOT_NULL(mc->cluster_config); + + /* Both racing calls independently resolve + decode the SAME conf/current + * file -- real production behaviour: two concurrent + * handle_repl_config_push deliveries for the same standby race over the + * SAME on-disk config, not different ones. */ + lpc_gate_init(&g_lpc_gate); + atomic_store(&g_lpc_hook_block_next, 1); + load_primary_config_race_hook = lpc_race_hook; + + lpc_thread_arg_t arg_a = { .c = &c, .done = 0, .rc = 0 }; + lpc_thread_arg_t arg_b = { .c = &c, .done = 0, .rc = 0 }; + + pthread_t thread_a; + TEST_ASSERT_EQUAL_INT(0, + pthread_create(&thread_a, NULL, lpc_call_load_primary_config, &arg_a)); + + TEST_ASSERT_EQUAL_INT_MESSAGE(0, lpc_gate_wait_entered(&g_lpc_gate, 2000), + "thread A must reach the race-hook checkpoint inside " + "load_primary_config before the test proceeds"); + + pthread_t thread_b; + TEST_ASSERT_EQUAL_INT(0, + pthread_create(&thread_b, NULL, lpc_call_load_primary_config, &arg_b)); + + /* Snapshot whether B completed WHILE A was still parked -- the + * serialization proof. Captured into a plain variable (not asserted + * yet) so a pre-fix failure here does not abort the test before it + * reaches the release below: pre-fix (RED) the crash triggered by that + * release is the primary, load-bearing signal; this flag is + * corroborating evidence, asserted only after both threads have safely + * joined post-release. */ + int b_raced_through_while_a_parked = cc_poll_flag(&arg_b.done, 300); + + lpc_gate_open(&g_lpc_gate); + + TEST_ASSERT_TRUE_MESSAGE(cc_poll_flag(&arg_a.done, 2000), + "thread A must complete once released"); + pthread_join(thread_a, NULL); + + TEST_ASSERT_TRUE_MESSAGE(cc_poll_flag(&arg_b.done, 2000), + "thread B must complete once unblocked by A's release"); + pthread_join(thread_b, NULL); + + load_primary_config_race_hook = NULL; + lpc_gate_destroy(&g_lpc_gate); + + TEST_ASSERT_EQUAL_INT(0, atomic_load(&arg_a.rc)); + TEST_ASSERT_EQUAL_INT(0, atomic_load(&arg_b.rc)); + + /* No corruption: the final published config is fully valid (whichever + * of the two calls happened to finish last -- both raced the SAME + * conf/current file, so either outcome is a legitimate, fully-decoded + * config, never a torn/freed one). */ + TEST_ASSERT_NOT_NULL(mc->cluster_config); + TEST_ASSERT_NOT_NULL(mc->cluster_config->clustername); + TEST_ASSERT_EQUAL_STRING("t43-upgrade", mc->cluster_config->clustername); + + /* GREEN: myconf->lock must have kept B blocked the whole time A was + * parked mid-call. RED (no lock) reliably fails this -- but reliably + * crashes (ASan double-free abort) even earlier, at lpc_gate_open() + * above, before ever reaching this line. */ + TEST_ASSERT_EQUAL_INT_MESSAGE(0, b_raced_through_while_a_parked, + "thread B's load_primary_config must stay blocked (serialized by " + "myconf->lock) while thread A is parked mid-call"); + + t43_free_myconf(&c); + printf("test_bug1476_concurrent_load_primary_config_no_uaf_or_double_free: PASS\n"); +} + #endif /* XCE_TESTING */ /* ── dispatch ───────────────────────────────────── */ @@ -4231,19 +7379,63 @@ void test_config_repl(void) * no-marker fallback, serve-fence enforced by dispatch gate + promotion). */ RUN_TEST(test_push_path_mismatch_does_not_preactivate); RUN_TEST(test_config_activate_no_marker_falls_back_and_loads); + /* config-upgrade-snapshot task 6.1: Activation Fence. */ + RUN_TEST(test_upgrade_materialization_verify_no_marker_clears_fence); + RUN_TEST(test_upgrade_materialization_verify_matching_materialization_clears_fence); + RUN_TEST(test_upgrade_materialization_verify_incomplete_materialization_fences); + RUN_TEST(test_upgrade_materialization_verify_stale_local_bytes_after_materialization_fences); RUN_TEST(test_serve_fence_enforced_by_dispatch_gate_and_promotion); /* Task 4.3 r2 remediation: commit-advance retry clears a push-before-commit * serve-fence (Finding D / R7.9). */ RUN_TEST(test_commit_advance_retry_clears_push_before_commit_fence); + /* config-upgrade-snapshot task 6.2: Activation Fence gate composition + + * self-triggering retry. */ + RUN_TEST(test_upgrade_materialization_fence_enforced_by_dispatch_gate_and_promotion); + RUN_TEST(test_schedule_upgrade_materialization_retry_noop_when_not_fenced); + RUN_TEST(test_schedule_upgrade_materialization_retry_noop_when_delaymgr_not_running); + RUN_TEST(test_upgrade_materialization_retry_fn_recovers_from_stale_bytes_fence); + RUN_TEST(test_commit_advance_wiring_calls_upgrade_materialization_schedule_retry); + RUN_TEST(test_ha_phase2_retry_fn_noop_when_already_done); + RUN_TEST(test_ha_phase2_retry_fn_does_not_latch_on_failure_and_succeeds_on_retry); + RUN_TEST(test_schedule_phase2_retry_noop_when_already_done); + RUN_TEST(test_schedule_phase2_retry_noop_when_delaymgr_not_running); + /* config-upgrade-snapshot task 6.2 remediation: fence set by a REAL + * production trigger (apply_committed_entry's WAL_CONFIG_MARKER case), + * not a direct test call -- proves the fence is reachable at all. */ + RUN_TEST(test_wal_config_marker_apply_sets_fence_via_real_checkpoint_miss); + /* bug-1469: WAL_CONFIG_MARKER apply must activate config on the + * ORIGINATING member too, not just receiving standbys. */ + RUN_TEST(test_wal_config_marker_apply_activates_originating_member_config); + /* config-upgrade-snapshot task 8.8: a second configuration-change + * marker committing before the first's snapshot install completes + * everywhere must cleanly supersede it, never leave it partially + * applied or conflated with the newer one. */ + RUN_TEST(test_second_config_marker_supersedes_first_still_installing_on_member); + /* config-upgrade-snapshot task 8.7 Scenario 2: leadership change + * mid-materialization completes via the same generic apply-drain path. */ + RUN_TEST(test_leadership_change_mid_materialization_completes_via_same_generic_apply_drain); #ifdef XCE_TESTING RUN_TEST(test_load_primary_config_missing_returns_error); RUN_TEST(test_wait_all_with_timeout_slow_threads); RUN_TEST(test_wait_all_with_timeout_fast_threads); /* bug-1381: push_config_transport_only endpoint-lifetime regression */ RUN_TEST(test_configpush_transport_holds_endpoint_ref_across_send); + /* raft-adapter-conformance task 2.1: config-push reject reply integrity */ + RUN_TEST(test_config_push_sha256_mismatch_sends_explicit_reject_reply); + /* raft-adapter-conformance task 2.2: config-push reply term adoption */ + RUN_TEST(test_config_push_reply_higher_term_adopts_and_steps_down); + /* raft-adapter-conformance task 2.3: full config-push reply-integrity + * coverage -- remaining reject paths, the EAGAIN accept path, and the + * term-adoption check on the accept branch. */ + RUN_TEST(test_config_push_malformed_request_sends_explicit_reject_reply); + RUN_TEST(test_config_push_missing_bytes_sends_explicit_reject_reply); + RUN_TEST(test_config_push_save_failure_sends_explicit_reject_reply); + RUN_TEST(test_config_push_eagain_activation_deferred_still_sends_accepted); + RUN_TEST(test_config_push_reply_higher_term_adopts_on_accept); /* Task 2.1: OPCode_walCatchupEntry handler */ RUN_TEST(test_wal_catchup_entry_advances_applied_lsn); RUN_TEST(test_wal_catchup_entry_error_skipped_no_crash); + RUN_TEST(test_bug1479_ae_reject_sends_nack_not_silence); RUN_TEST(test_wal_catchup_entry_null_entry_no_crash); /* Task 2.2: batch WAL catch-up entries */ RUN_TEST(test_wal_catchup_batch_advances_applied_lsn); @@ -4261,13 +7453,18 @@ void test_config_repl(void) RUN_TEST(test_wal_stream_partial_batch); RUN_TEST(test_wal_stream_empty_range_no_batches); RUN_TEST(test_wal_stream_skips_checkpoint_marker); + RUN_TEST(test_bug1475_catchup_survives_midstream_checkpoint); /* bug-1475 */ RUN_TEST(test_wal_stream_term_from_index_not_raw_hdr); /* bug-1028 */ /* Task 3.5: snapshot chunk transfer (sender side) */ RUN_TEST(test_snapshot_transfer_two_chunks); + RUN_TEST(test_bug1475_finding2_snapshot_install_checkpoint_term_absent); /* bug-1475 Finding 2 */ RUN_TEST(test_snapshot_transfer_small_less_than_one_chunk); RUN_TEST(test_snapshot_transfer_stops_and_propagates_send_failure); /* Task 3.5c: standby snapshot receive handler */ RUN_TEST(test_snapshot_recv_two_chunks_assembles_and_renames); + /* config-upgrade-snapshot task 1: prior SNAPSHOT_FORMAT_VERSION rejected + * fail-loud by a binary built against the bumped version */ + RUN_TEST(test_snapshot_recv_old_format_version_rejected_fail_loud); /* Task 6.1: legacy position-only file consumed end-to-end via the * receive handler — entities_restored=false path */ RUN_TEST(test_snapshot_recv_legacy_file_advances_without_entities); @@ -4284,6 +7481,8 @@ void test_config_repl(void) * (2026-07-18): catch-up continuation slow-lane offload */ RUN_TEST(test_catchup_offload_probe_runs_promptly); RUN_TEST(test_catchup_inline_probe_blocks_RED); + /* bug-1476: concurrent load_primary_config() UAF/double-free race */ + RUN_TEST(test_bug1476_concurrent_load_primary_config_no_uaf_or_double_free); #endif /* Task A: raw capnp shims */ RUN_TEST(test_replconfig_req_ssl_encode); diff --git a/src/controller/testsuite/test_configcompare.c b/src/controller/testsuite/test_configcompare.c new file mode 100644 index 0000000..e9eff21 --- /dev/null +++ b/src/controller/testsuite/test_configcompare.c @@ -0,0 +1,217 @@ +#define _GNU_SOURCE +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +#include "configcompare.h" + +static char g_dir[256]; + +static void fresh_dir(void) +{ + strcpy(g_dir, "/tmp/xce_configcompare_XXXXXX"); + TEST_ASSERT_NOT_NULL(mkdtemp(g_dir)); +} + +static void cleanup_dir(void) +{ + char cmd[512]; + snprintf(cmd, sizeof(cmd), "rm -rf %s", g_dir); + system(cmd); +} + +/* Creates //conf/ (a member's `workdir/name` directory, mirroring + * conf_dir = "%s/%s", myconf->workdir, myconf->name in persist.c / + * config_repl.c) and writes the resulting path into out_path. Does NOT touch + * config_repl.c or persist.c -- these are hand-written fixture files so the + * test exercises configcompare.c's OWN resolve-then-read logic, not a + * different code path's. */ +static void make_member_dir(const char* root, const char* name, + char out_path[512]) +{ + snprintf(out_path, 512, "%s/%s", root, name); + TEST_ASSERT_EQUAL_INT(0, mkdir(out_path, 0700)); + char conf_dir[560]; + snprintf(conf_dir, sizeof(conf_dir), "%s/conf", out_path); + TEST_ASSERT_EQUAL_INT(0, mkdir(conf_dir, 0700)); +} + +static void write_conf_current(const char* member_path, const char* hexsuffix) +{ + char ptr_path[600]; + snprintf(ptr_path, sizeof(ptr_path), "%s/conf/current", member_path); + FILE* f = fopen(ptr_path, "w"); + TEST_ASSERT_NOT_NULL(f); + fprintf(f, "cluster.bin.%s\n", hexsuffix); + fclose(f); +} + +static void write_conf_blob(const char* member_path, const char* hexsuffix, + const uint8_t* bytes, size_t len) +{ + char blob_path[600]; + snprintf(blob_path, sizeof(blob_path), "%s/conf/cluster.bin.%s", + member_path, hexsuffix); + FILE* f = fopen(blob_path, "wb"); + TEST_ASSERT_NOT_NULL(f); + if (len > 0) + TEST_ASSERT_EQUAL_INT((int)len, (int)fwrite(bytes, 1, len, f)); + fclose(f); +} + +/* Full happy-path member: dir + conf/current + the versioned blob it + * points at. */ +static void setup_member_ok(const char* root, const char* name, + const char* hexsuffix, const uint8_t* bytes, + size_t len, char out_path[512]) +{ + make_member_dir(root, name, out_path); + write_conf_current(out_path, hexsuffix); + write_conf_blob(out_path, hexsuffix, bytes, len); +} + +static void test_two_members_identical_config_reports_identical(void) +{ + fresh_dir(); + const uint8_t data[] = "identical config bytes for both members"; + + char m0[512], m1[512]; + setup_member_ok(g_dir, "m0", "aaaaaaaaaaaa", data, sizeof(data) - 1, m0); + setup_member_ok(g_dir, "m1", "bbbbbbbbbbbb", data, sizeof(data) - 1, m1); + + const char* paths[2] = { m0, m1 }; + configcompare_report_t rep; + int rc = configcompare_paths(paths, 2, stdout, &rep); + + TEST_ASSERT_EQUAL_INT(0, rc); + TEST_ASSERT_EQUAL_INT(1, rep.all_present); + TEST_ASSERT_EQUAL_INT(1, rep.all_identical); + TEST_ASSERT_EQUAL_INT(-1, rep.first_divergent_index); + cleanup_dir(); +} + +static void test_two_members_differing_config_reports_divergent(void) +{ + fresh_dir(); + const uint8_t data0[] = "config bytes version A"; + const uint8_t data1[] = "config bytes version B, quite different"; + + char m0[512], m1[512]; + setup_member_ok(g_dir, "m0", "aaaaaaaaaaaa", data0, sizeof(data0) - 1, m0); + setup_member_ok(g_dir, "m1", "bbbbbbbbbbbb", data1, sizeof(data1) - 1, m1); + + const char* paths[2] = { m0, m1 }; + configcompare_report_t rep; + int rc = configcompare_paths(paths, 2, stdout, &rep); + + TEST_ASSERT_EQUAL_INT(1, rc); + TEST_ASSERT_EQUAL_INT(1, rep.all_present); + TEST_ASSERT_EQUAL_INT(0, rep.all_identical); + TEST_ASSERT_EQUAL_INT(1, rep.first_divergent_index); + cleanup_dir(); +} + +/* A member with no conf/current pointer file at all must be reported as + * unreadable (read_rc != 0), never silently folded into "identical" or + * "divergent" against the two members that DO agree. */ +static void test_missing_conf_current_reported_unreadable_not_divergent(void) +{ + fresh_dir(); + const uint8_t data[] = "shared config bytes across the healthy members"; + + char m0[512], m1[512], m2[512]; + setup_member_ok(g_dir, "m0", "aaaaaaaaaaaa", data, sizeof(data) - 1, m0); + /* m1: conf/ dir exists but conf/current was never written. */ + make_member_dir(g_dir, "m1", m1); + setup_member_ok(g_dir, "m2", "cccccccccccc", data, sizeof(data) - 1, m2); + + const char* paths[3] = { m0, m1, m2 }; + configcompare_report_t rep; + int rc = configcompare_paths(paths, 3, stdout, &rep); + + TEST_ASSERT_LESS_THAN_INT(0, rc); + TEST_ASSERT_EQUAL_INT(0, rep.read_rc[0]); + TEST_ASSERT_NOT_EQUAL(0, rep.read_rc[1]); + TEST_ASSERT_EQUAL_INT(0, rep.all_present); + cleanup_dir(); +} + +/* A member whose conf/current points at a versioned file that does not + * exist on disk gets the same "unreadable" treatment as a missing pointer + * file -- neither is evidence of matching or mismatching configuration. */ +static void test_current_points_to_missing_versioned_file_reported_unreadable(void) +{ + fresh_dir(); + const uint8_t data[] = "shared config bytes, dangling pointer case"; + + char m0[512], m1[512]; + setup_member_ok(g_dir, "m0", "aaaaaaaaaaaa", data, sizeof(data) - 1, m0); + /* m1: conf/current points at cluster.bin.dddddddddddd, but that + * versioned file was never written. */ + make_member_dir(g_dir, "m1", m1); + write_conf_current(m1, "dddddddddddd"); + + const char* paths[2] = { m0, m1 }; + configcompare_report_t rep; + int rc = configcompare_paths(paths, 2, stdout, &rep); + + TEST_ASSERT_LESS_THAN_INT(0, rc); + TEST_ASSERT_EQUAL_INT(0, rep.read_rc[0]); + TEST_ASSERT_NOT_EQUAL(0, rep.read_rc[1]); + cleanup_dir(); +} + +/* Basic determinism sanity check: comparing the same two byte-identical + * files twice in a row yields the same hash both times. */ +static void test_repeated_comparison_of_identical_files_is_deterministic(void) +{ + fresh_dir(); + const uint8_t data[] = "deterministic hash check bytes, fixed content"; + + char m0[512], m1[512]; + setup_member_ok(g_dir, "m0", "aaaaaaaaaaaa", data, sizeof(data) - 1, m0); + setup_member_ok(g_dir, "m1", "bbbbbbbbbbbb", data, sizeof(data) - 1, m1); + + const char* paths[2] = { m0, m1 }; + configcompare_report_t rep1, rep2; + int rc1 = configcompare_paths(paths, 2, NULL, &rep1); + int rc2 = configcompare_paths(paths, 2, NULL, &rep2); + + TEST_ASSERT_EQUAL_INT(0, rc1); + TEST_ASSERT_EQUAL_INT(0, rc2); + TEST_ASSERT_EQUAL_INT(0, memcmp(rep1.sha256[0], rep2.sha256[0], 32)); + TEST_ASSERT_EQUAL_INT(0, memcmp(rep1.sha256[1], rep2.sha256[1], 32)); + cleanup_dir(); +} + +/* Fewer than two members means there is nothing to compare -- a negative + * errno, not a degenerate "identical" verdict. */ +static void test_n_less_than_2_returns_negative_errno(void) +{ + const char* one_path[1] = { "/tmp/xce_configcompare_irrelevant" }; + configcompare_report_t rep; + + int rc0 = configcompare_paths(NULL, 0, NULL, &rep); + TEST_ASSERT_LESS_THAN_INT(0, rc0); + + int rc1 = configcompare_paths(one_path, 1, NULL, &rep); + TEST_ASSERT_LESS_THAN_INT(0, rc1); +} + +void test_configcompare(void) +{ + UnitySetTestFile(__FILE__); + RUN_TEST(test_two_members_identical_config_reports_identical); + RUN_TEST(test_two_members_differing_config_reports_divergent); + RUN_TEST(test_missing_conf_current_reported_unreadable_not_divergent); + RUN_TEST(test_current_points_to_missing_versioned_file_reported_unreadable); + RUN_TEST(test_repeated_comparison_of_identical_files_is_deterministic); + RUN_TEST(test_n_less_than_2_returns_negative_errno); +} diff --git a/src/controller/testsuite/test_convergence_verification.c b/src/controller/testsuite/test_convergence_verification.c index ab7834c..5670e9b 100644 --- a/src/controller/testsuite/test_convergence_verification.c +++ b/src/controller/testsuite/test_convergence_verification.c @@ -276,17 +276,22 @@ static int cv_standby_in_catch_up(repl_ep_t ep) /* ── Tests ──────────────────────────────────────────────────────────────── */ -/* 5.1: a walAck with acked_lsn < target = max(committed_lsn, last_written) - * schedules EXACTLY ONE continuation that streams [acked_lsn+1, target] without - * any intervening heartbeat/stateReport dispatch. +/* 5.1: a walAck with acked_lsn < target = ha_compute_repl_target_lsn( + * committed_lsn, last_written) schedules EXACTLY ONE continuation that + * streams [acked_lsn+1, target] without any intervening heartbeat/ + * stateReport dispatch. * RED: the walAck continuation scaffold schedules nothing → no task, the stream * hook is never called. */ static void test_walack_behind_target_schedules_one_continuation(void) { - /* appended_lsn=9 → last_written=9; committed_lsn=4 → target=max(4,9)=9. */ + /* appended_lsn=9 → last_written=9; committed_lsn=9 → target=9. Kept equal + * to last_written (rather than a lower value like the historical 4) so + * this test exercises catch-up continuation scheduling only — the + * committed_lsn-vs-last_written edge case itself (bug-1478) has its own + * dedicated pure-function coverage in test_ha_role.c. */ cv_setup("behind", /*n_peers=*/3, /*n_standbys=*/1, /*appended_lsn=*/9, /*n_vcpus=*/8); - atomic_store(&g_cv.persist.committed_lsn, 4); + atomic_store(&g_cv.persist.committed_lsn, 9); const int peer_idx = 0; const uint64_t acked_lsn = 3; /* behind target 9 */ @@ -325,8 +330,8 @@ static void test_walack_behind_target_schedules_one_continuation(void) "[acked_lsn+1, target]) (Req 5.1)"); TEST_ASSERT_EQUAL_UINT64_MESSAGE(target, atomic_load(&g_stream_last_target_lsn), - "the continuation must stream up to target = max(committed_lsn, " - "last_written) (Req 5.1)"); + "the continuation must stream up to target = " + "ha_compute_repl_target_lsn(committed_lsn, last_written) (Req 5.1)"); cv_teardown(); printf("test_walack_behind_target_schedules_one_continuation: checked\n"); @@ -338,9 +343,11 @@ static void test_walack_behind_target_schedules_one_continuation(void) * "exactly one continuation across two ACKs" assertion fails (0 != 1). */ static void test_walack_single_flight_no_duplicate_continuation(void) { + /* committed_lsn == appended_lsn (target=9 either way) — see the "behind" + * test's own note on why these don't use a lower committed_lsn. */ cv_setup("single", /*n_peers=*/3, /*n_standbys=*/1, /*appended_lsn=*/9, /*n_vcpus=*/8); - atomic_store(&g_cv.persist.committed_lsn, 4); + atomic_store(&g_cv.persist.committed_lsn, 9); const int peer_idx = 0; @@ -382,9 +389,11 @@ static void test_walack_single_flight_no_duplicate_continuation(void) * RED: the scaffold never schedules/clears, so neither continuation appears. */ static void test_walack_reschedules_after_continuation_completes(void) { + /* committed_lsn == appended_lsn (target=9 either way) — see the "behind" + * test's own note on why these don't use a lower committed_lsn. */ cv_setup("respawn", /*n_peers=*/3, /*n_standbys=*/1, /*appended_lsn=*/9, /*n_vcpus=*/8); - atomic_store(&g_cv.persist.committed_lsn, 4); + atomic_store(&g_cv.persist.committed_lsn, 9); const int peer_idx = 0; diff --git a/src/controller/testsuite/test_ha_core_safety.c b/src/controller/testsuite/test_ha_core_safety.c index e8514a5..f8b139f 100644 --- a/src/controller/testsuite/test_ha_core_safety.c +++ b/src/controller/testsuite/test_ha_core_safety.c @@ -2645,6 +2645,234 @@ static void test_6_2_real_senders_never_produce_termblind_shape(void) printf("test_6_2_real_senders_never_produce_termblind_shape: done\n"); } +/* Task 4.1 (raft-adapter-conformance, Requirement 3.3) sanity check: this is + * NOT task 4.2's "drives the production heartbeat/replication path + * end-to-end and asserts the counter stays at zero" non-regression test — + * that test belongs to task 4.2 and lives separately. This is only a + * trivial proof that the counter itself works: it is directly + * readable/resettable from a test (XCE_TESTING extern linkage, ha.h) and + * increments by exactly one per invocation of ha_cb_send_append_entries_stub + * (driven here via the existing ha_cb_send_append_entries_for_test seam). + * ha==NULL still reaches the increment — it is the very first statement in + * the callback body, before the ha/raft_c NULL guard — so this needs no + * cluster/persist fixture at all. */ +static void test_4_1_send_append_entries_stub_call_count_increments(void) +{ + ha_send_append_entries_stub_call_count = 0; + + int rc = ha_cb_send_append_entries_for_test(NULL, /*peer*/0, + /*prev_idx*/0, /*prev_term*/0, + /*leader_commit*/0, /*n*/0); + TEST_ASSERT_EQUAL_INT(-EINVAL, rc); + TEST_ASSERT_EQUAL_UINT64_MESSAGE(1, ha_send_append_entries_stub_call_count, + "ha_send_append_entries_stub_call_count must increment once per " + "ha_cb_send_append_entries_stub invocation"); + + rc = ha_cb_send_append_entries_for_test(NULL, /*peer*/0, 0, 0, 0, 0); + TEST_ASSERT_EQUAL_INT(-EINVAL, rc); + TEST_ASSERT_EQUAL_UINT64_MESSAGE(2, ha_send_append_entries_stub_call_count, + "the counter must accumulate across multiple invocations, not just " + "latch at 1"); + + printf("test_4_1_send_append_entries_stub_call_count_increments: PASS\n"); +} + +/* Task 4.2 (raft-adapter-conformance, Requirement 3.3): the fuller + * non-regression guard task 4.1's doc-comment promises — drive BOTH real + * production AppendEntries-equivalent senders (repl_broadcast for live + * in-term replication, ha_stream_wal_to_standby for catch-up streaming) end + * to end and assert ha_send_append_entries_stub_call_count stays at 0 + * throughout, while independently confirming each real sender actually fired + * for this scenario — so the zero-count assertion is not vacuously true + * because nothing ran. Reuses the exact fixtures/hooks task 6.2's + * test_6_2_real_senders_never_produce_termblind_shape already established for + * driving these same two real senders (repl_broadcast_send_hook + + * hcs_6_2_broadcast_hook/g_hcs62_bcast_n for sender 1; + * xce_wal_stream_request_hook + hcs_2_3_capture_hook/g_sends_n for sender 2). + * If a future change ever gives raft_send_append_entries a production + * caller, this test catches it. */ +static void test_4_2_dormant_sender_stays_uncalled_in_production(void) +{ + /* Reset first: an earlier test in this same process (task 4.1's own + * sanity test, which runs immediately before this one in the suite) + * already drove ha_cb_send_append_entries_for_test directly and left the + * counter non-zero — Unity tests share process state. */ + ha_send_append_entries_stub_call_count = 0; + + /* ── Real sender 1: repl_broadcast (live in-term replication) ─────────── */ + replicator_t r; + TEST_ASSERT_EQUAL_INT(0, repl_init(&r)); + int dummy_ep = 0; + TEST_ASSERT_TRUE(repl_add_standby(&r, (void*)&dummy_ep, "standby", 7101) >= 0); + + uint8_t full[HCS_FULL_LEN]; + hcs_fill_body(full); + + wal_entry_hdr_t hdr; + memset(&hdr, 0, sizeof(hdr)); + hdr.lsn = 1; + hdr.type = WAL_JOB_SUBMIT; + hdr.term = 3; + + g_hcs62_bcast_n = 0; + repl_broadcast_send_hook = hcs_6_2_broadcast_hook; + int brc = repl_broadcast(&r, &hdr, full, HCS_FULL_LEN, /*prev_log_term=*/0); + repl_broadcast_send_hook = NULL; + repl_fini(&r); + + TEST_ASSERT_EQUAL_INT(0, brc); + TEST_ASSERT_EQUAL_INT_MESSAGE(1, g_hcs62_bcast_n, + "repl_broadcast must have actually sent to the registered standby — " + "otherwise the counter-stays-zero assertion below would be vacuous"); + + /* ── Real sender 2: ha_stream_wal_to_standby (catch-up streaming) ──────── */ + hcs_member_t src, rcv; + TEST_ASSERT_EQUAL_INT(0, hcs_member_up(&src, "42src")); + TEST_ASSERT_EQUAL_INT(0, hcs_member_up(&rcv, "42rcv")); + + TEST_ASSERT_EQUAL_INT(0, hcs_wal_put(&src, 1, /*term=*/3, WAL_JOB_SUBMIT, + full, HCS_FULL_LEN)); + atomic_store_explicit(&src.p->committed_lsn, 1, memory_order_release); + + hcs_2_3_reset(&rcv, /*fault_lsn=*/0 /* no fault injected — happy path */); + xce_wal_stream_request_hook = hcs_2_3_capture_hook; + int src_rc = ha_stream_wal_to_standby((endpoint_t*)NULL, src.wal_dir, src.p, + /*leader_term=*/3, /*standby_lsn=*/0, + /*committed_lsn=*/1); + xce_wal_stream_request_hook = NULL; + TEST_ASSERT_EQUAL_INT(0, src_rc); + + TEST_ASSERT_TRUE_MESSAGE(g_sends_n >= 1, + "ha_stream_wal_to_standby must have actually streamed at least one " + "entry — otherwise the counter-stays-zero assertion below would be " + "vacuous"); + + hcs_member_down(&src); + hcs_member_down(&rcv); + + /* ── The Requirement 3.3 non-regression guard itself ──────────────────── + * Both real production AppendEntries-equivalent senders just fired + * (proven non-vacuous above) — yet the dormant + * ha_cb_send_append_entries_stub callback, reachable only via + * raft_send_append_entries (zero production callers), must never have + * been invoked by driving this real path. */ + TEST_ASSERT_EQUAL_UINT64_MESSAGE(0, ha_send_append_entries_stub_call_count, + "driving the production heartbeat/replication path end-to-end must " + "NEVER increment ha_send_append_entries_stub_call_count — a nonzero " + "count here means raft_send_append_entries acquired a production " + "caller, invalidating the Requirement 3.3 'documented dormant' " + "resolution"); + + printf("test_4_2_dormant_sender_stays_uncalled_in_production: PASS\n"); +} + +/* ═══════════════════════════════════════════════════════════════════════════ + * TASK 5.1 (raft-adapter-conformance) — regression-lock: a WAL catch-up + * rejection actually sends the NACK reply on the wire. + * + * bug-1479 fixed ha_apply_term_entry_via_library's logOk-reject branch (ha.c + * ~3315-3327) to call ha_send_wal_ack_reply_ex(ha, ep, c, e->lsn, success=0) + * instead of silently dropping the reject — before that fix NOTHING was sent + * on reject, so the primary's NACK-handling (ha_raft_on_repl_nack) was correct + * but unreachable dead code. Downstream tests (ha_raft_on_repl_nack's own + * suite, catch-up-triggering tests) already prove the EFFECTS of a NACK once + * one arrives; this test closes the reply-CONSTRUCTION-boundary gap itself — + * that the reject branch actually invokes ha_send_wal_ack_reply_ex(success=0) + * — asserted here via the ha_wal_ack_send_hook seam (ha.h, XCE_TESTING), + * mirroring test_config_repl.c's test_bug1479_ae_reject_sends_nack_not_silence + * but built from THIS file's own hcs4_* fixture family (Requirement 2.1's + * _Boundary:_ is this file) so a future change to the reject branch is caught + * here too, independent of test_config_repl.c. + * + * Fixture: a STANDBY follower with a real persisted LSN1@STORED_TERM tip. A + * term-carrying single-entry AppendEntries claims prev=(1, CLAIMED_PREV_TERM) + * — a genuine (term,lsn) mismatch against the real on-disk term at LSN1 — so + * logOk fails and ha_apply_term_entry_via_library takes the reject branch. + * Driven through the REAL production ingest seam, ha_apply_wal_catchup_entry + * (the exact function every incoming WAL replication message is routed to), + * the same seam task 6.1 already established in this file. + * ═══════════════════════════════════════════════════════════════════════════ */ +static uint64_t g_hcs51_hook_term; +static uint64_t g_hcs51_hook_lsn; +static int g_hcs51_hook_success; +static int g_hcs51_hook_called; + +static void hcs51_wal_ack_capture(uint64_t term, uint64_t lsn, int success) +{ + g_hcs51_hook_called = 1; + g_hcs51_hook_term = term; + g_hcs51_hook_lsn = lsn; + g_hcs51_hook_success = success; +} + +static void test_5_1_wal_catchup_reject_sends_nack_reply(void) +{ + cluster_t* c = hcs4_cluster_up("wal_nack"); + TEST_ASSERT_NOT_NULL(c); + + enum { FOLLOWER_TERM = 4, STORED_TERM = 2, CLAIMED_PREV_TERM = 3 }; + hcs4_make_follower(c, /*term*/FOLLOWER_TERM, /*n_peers*/3); + + /* Real persisted tip: LSN1 @ STORED_TERM, via the wired standby persist + * callback (real fs required for inline fdatasync — bug-924). */ + uint8_t full[HCS_FULL_LEN]; + hcs_fill_body(full); + uint8_t blob[sizeof(raft_entry_blob_t) + HCS_FULL_LEN]; + size_t n = hcs4_pack_entry(blob, WAL_JOB_SUBMIT, full, HCS_FULL_LEN); + TEST_ASSERT_EQUAL_INT_MESSAGE(0, + ha_cb_persist_entry_for_test(&c->ha, 1, STORED_TERM, blob, n), + "seed write must persist (real fs required — bug-924)"); + c->ha.raft.log_len = 1; + + /* A term-carrying entry at LSN2 claims prev=(1, CLAIMED_PREV_TERM) — a + * genuine (term,lsn) mismatch against the real LSN1@STORED_TERM on disk + * (CLAIMED_PREV_TERM != STORED_TERM), so logOk MUST reject it. */ + uint8_t lpay[1] = { 'z' }; + wal_catchup_entry_t sub; + memset(&sub, 0, sizeof(sub)); + sub.lsn = 2; + sub.entry_type = WAL_JOB_UPDATE; + sub.term = FOLLOWER_TERM; + sub.prev_log_index = 1; + sub.prev_log_term = CLAIMED_PREV_TERM; + sub.raw_payload = lpay; + sub.raw_payload_len = 1; + + wal_catchup_entry_t* sub_arr[1] = { &sub }; + wal_catchup_entry_t top; + memset(&top, 0, sizeof(top)); + top.n_entries = 1; + top.entries = sub_arr; + + g_hcs51_hook_called = 0; + ha_wal_ack_send_hook = hcs51_wal_ack_capture; + + int rc = ha_apply_wal_catchup_entry(&c->ha, &c->persist, &top, + /*ep*/NULL, c); + + ha_wal_ack_send_hook = NULL; /* uninstall before any assertion can fail */ + + TEST_ASSERT_EQUAL_INT(0, rc); /* reject, not a hard error */ + + /* Nothing was accepted at LSN2: the rejected entry never landed. */ + hcs_probe_t pr; + TEST_ASSERT_EQUAL_INT(0, hcs4_probe(c, 2, &pr)); + TEST_ASSERT_FALSE_MESSAGE(pr.present, + "a rejected entry must never be persisted at its LSN"); + + TEST_ASSERT_TRUE_MESSAGE(g_hcs51_hook_called, + "a WAL catch-up rejection must send a WalAckReply NACK " + "(ha_send_wal_ack_reply_ex success=0), not silence it -- the " + "reply-construction boundary bug-1479 fixed"); + TEST_ASSERT_EQUAL_INT_MESSAGE(0, g_hcs51_hook_success, + "the reply for a rejected WAL catch-up entry must carry success=0"); + TEST_ASSERT_EQUAL_UINT64((uint64_t)FOLLOWER_TERM, g_hcs51_hook_term); + TEST_ASSERT_EQUAL_UINT64(2, g_hcs51_hook_lsn); + + hcs4_cluster_down(c); + printf("test_5_1_wal_catchup_reject_sends_nack_reply: PASS\n"); +} + /* ── Suite entry point ─────────────────────────────────────────────────────*/ void test_ha_core_safety(void) @@ -2740,4 +2968,19 @@ void test_ha_core_safety(void) * above and in ha.c. */ RUN_TEST(test_6_2_restart_preserves_term_identity); RUN_TEST(test_6_2_real_senders_never_produce_termblind_shape); + /* Task 4.1 (raft-adapter-conformance) sanity check: the new + * ha_send_append_entries_stub_call_count non-regression-guard counter + * itself increments correctly. Task 4.2 owns the fuller "stays at zero + * across a real production replication drive" assertion. */ + RUN_TEST(test_4_1_send_append_entries_stub_call_count_increments); + /* Task 4.2 (raft-adapter-conformance): the fuller non-regression guard — + * drive repl_broadcast and ha_stream_wal_to_standby (the two real + * production senders) end-to-end and confirm the dormant stub's counter + * never moves off zero, while proving each real sender actually fired. */ + RUN_TEST(test_4_2_dormant_sender_stays_uncalled_in_production); + /* Task 5.1 (raft-adapter-conformance): regression-lock the bug-1479 + * reply-construction boundary — a WAL catch-up rejection must actually + * invoke ha_send_wal_ack_reply_ex(success=0) via ha_wal_ack_send_hook, + * not silently drop the reject. */ + RUN_TEST(test_5_1_wal_catchup_reject_sends_nack_reply); } diff --git a/src/controller/testsuite/test_ha_role.c b/src/controller/testsuite/test_ha_role.c index 8bd1472..eea626c 100644 --- a/src/controller/testsuite/test_ha_role.c +++ b/src/controller/testsuite/test_ha_role.c @@ -660,6 +660,119 @@ static void test_evaluate_repl_action_stream_wal_fresh_system(void) printf("test_evaluate_repl_action_stream_wal_fresh_system: PASS\n"); } +/* ── bug-1478: ha_compute_repl_target_lsn ───────────────────────────────── + * + * repl_ack_decode_and_dispatch (ha.c) computes the replication/convergence + * target passed into ha_dispatch_repl_action_for_standby as + * max(committed_lsn, last_written), where last_written is the raw locally- + * appended WAL tip (persist.current_lsn - 1). A live 3-node HA soak + * (config-upgrade-snapshot task 8.9, --config-upgrade-wal-trim) caught this + * unconditional max() permanently wedging catch-up: once a marker-triggered + * checkpoint (a local-only, NEVER-replicated WAL_CHECKPOINT entry — + * persist_write_checkpoint_marker bumps current_lsn directly, bypassing + * raft_log_append/the commit engine, bug-1466) trails an already-advancing + * committed_lsn, last_written sits permanently one LSN past it — a position + * no standby's applied_lsn can EVER legitimately reach (the checkpoint's own + * slot is, by design, never streamed or applied). ha_evaluate_repl_action's + * standby_lsn < committed_lsn check then never reaches HA_REPL_CONVERGED, + * and the primary re-streams the same empty range every heartbeat, forever. + * Ground-truthed via `xce_test waldump` on the live soak's preserved WAL + * (ctrl-2: lsn 21 = the WAL_CONFIG_MARKER, lsn 22 = WAL_CHECKPOINT, 0 bytes) + * and via ctrl-2's own commit_advance_locked log (the REAL, majority-gated + * committed_lsn never advanced past 21 — only the target_lsn fallback + * leaked 22 into the heartbeat decision). + */ +static void test_compute_repl_target_lsn_bootstrap_fallback(void) +{ + /* committed_lsn genuinely stuck at 0 (no standby has ever acked) — the + * documented bootstrap exception: fall back to last_written so a + * first-ever connecting standby can catch up to real data. */ + TEST_ASSERT_EQUAL_UINT64(42, ha_compute_repl_target_lsn(0, 42)); + printf("test_compute_repl_target_lsn_bootstrap_fallback: PASS\n"); +} + +static void test_compute_repl_target_lsn_zero_zero(void) +{ + /* Genuinely fresh cluster, nothing appended yet. */ + TEST_ASSERT_EQUAL_UINT64(0, ha_compute_repl_target_lsn(0, 0)); + printf("test_compute_repl_target_lsn_zero_zero: PASS\n"); +} + +static void test_compute_repl_target_lsn_ignores_trailing_checkpoint_lsn(void) +{ + /* bug-1478's exact reproduction shape: committed_lsn=21 is already + * advancing (non-zero, real, majority-gated), but last_written=22 + * reflects a local-only WAL_CHECKPOINT that trails it. The bootstrap + * fallback must NOT fire here — the target must stay at the real + * committed_lsn (21), never the unstreamable checkpoint slot (22). */ + TEST_ASSERT_EQUAL_UINT64(21, ha_compute_repl_target_lsn(21, 22)); + printf("test_compute_repl_target_lsn_ignores_trailing_checkpoint_lsn: PASS\n"); +} + +static void test_compute_repl_target_lsn_committed_already_ahead(void) +{ + /* Normal steady-state case: committed_lsn is already the higher/current + * value; last_written (a possibly-stale, lock-free read) trails it. + * The target must simply be committed_lsn. */ + TEST_ASSERT_EQUAL_UINT64(100, ha_compute_repl_target_lsn(100, 50)); + printf("test_compute_repl_target_lsn_committed_already_ahead: PASS\n"); +} + +/* ── bug-1479 (gap 3): ha_compute_repl_stream_ceiling_lsn ───────────────── + * + * Distinct from ha_compute_repl_target_lsn above (the CONVERGENCE target, + * bootstrap-only fallback). This is the STREAM ceiling: a live 3-node HA + * soak (config-upgrade-snapshot task 8.6, force-elect round) caught + * committed_lsn-bounded streaming in a permanent deadlock -- with one member + * down and the other standby log-conflicted after a chaotic election, that + * standby's own ack is the ONLY path to a new majority, but it can never + * receive any entry past committed_lsn to ack in the first place, since + * ha_stream_wal_to_standby refuses to send anything beyond it. The ceiling + * must extend to the leader's real log tail so catch-up can make progress + * past a stalled commit point, while still excluding a trailing local-only + * checkpoint LSN (the exact bug-1478 trap) since no standby can ever + * legitimately ack that exact slot either. */ + +static void test_compute_repl_stream_ceiling_lsn_widens_past_committed(void) +{ + /* The core bug-1479 gap-3 fix: committed_lsn is stalled at 14, but the + * leader has real, streamable entries up to 33 -- the ceiling must + * widen to 33, not stay capped at 14. */ + TEST_ASSERT_EQUAL_UINT64(33, + ha_compute_repl_stream_ceiling_lsn(14, 33, /*checkpoint_lsn*/0)); + printf("test_compute_repl_stream_ceiling_lsn_widens_past_committed: PASS\n"); +} + +static void test_compute_repl_stream_ceiling_lsn_excludes_trailing_checkpoint(void) +{ + /* bug-1478's exact trap, reintroduced here if unguarded: last_written + * (15) IS the trailing local-only checkpoint's own consumed LSN slot + * (checkpoint_lsn=15) -- no standby can ever legitimately ack that exact + * value, so the ceiling must fall back to committed_lsn (14), not widen + * to the unreachable checkpoint slot. */ + TEST_ASSERT_EQUAL_UINT64(14, + ha_compute_repl_stream_ceiling_lsn(14, 15, /*checkpoint_lsn*/15)); + printf("test_compute_repl_stream_ceiling_lsn_excludes_trailing_checkpoint: PASS\n"); +} + +static void test_compute_repl_stream_ceiling_lsn_committed_already_ahead(void) +{ + /* Normal steady state: committed_lsn is already the higher value (a + * standby that hasn't caught up to a recently-advanced commit). The + * ceiling must simply be committed_lsn, never go backward. */ + TEST_ASSERT_EQUAL_UINT64(100, + ha_compute_repl_stream_ceiling_lsn(100, 50, /*checkpoint_lsn*/0)); + printf("test_compute_repl_stream_ceiling_lsn_committed_already_ahead: PASS\n"); +} + +static void test_compute_repl_stream_ceiling_lsn_zero_zero(void) +{ + /* Genuinely fresh cluster, nothing appended yet. */ + TEST_ASSERT_EQUAL_UINT64(0, + ha_compute_repl_stream_ceiling_lsn(0, 0, /*checkpoint_lsn*/0)); + printf("test_compute_repl_stream_ceiling_lsn_zero_zero: PASS\n"); +} + /* The transitional-leader timeout default test was removed: the config knob * and its default macro are deleted by ha-single-leader-role (the wall-clock * force-promotion watchdog it configured is gone — Req 1.5). */ @@ -892,6 +1005,16 @@ void test_ha_role(void) RUN_TEST(test_evaluate_repl_action_stream_wal); /* Task 6.1: (tag=T, lsn=0) with oldest_wal_lsn=0 → STREAM_WAL */ RUN_TEST(test_evaluate_repl_action_stream_wal_fresh_system); + /* bug-1478: ha_compute_repl_target_lsn */ + RUN_TEST(test_compute_repl_target_lsn_bootstrap_fallback); + RUN_TEST(test_compute_repl_target_lsn_zero_zero); + RUN_TEST(test_compute_repl_target_lsn_ignores_trailing_checkpoint_lsn); + RUN_TEST(test_compute_repl_target_lsn_committed_already_ahead); + /* bug-1479 (gap 3): ha_compute_repl_stream_ceiling_lsn */ + RUN_TEST(test_compute_repl_stream_ceiling_lsn_widens_past_committed); + RUN_TEST(test_compute_repl_stream_ceiling_lsn_excludes_trailing_checkpoint); + RUN_TEST(test_compute_repl_stream_ceiling_lsn_committed_already_ahead); + RUN_TEST(test_compute_repl_stream_ceiling_lsn_zero_zero); /* Task 3.3: ha_dispatch_repl_action_for_standby PUSH_CONFIG wiring */ RUN_TEST(test_dispatch_repl_action_push_config_when_tag_behind); RUN_TEST(test_dispatch_repl_action_no_push_when_converged); diff --git a/src/controller/testsuite/test_ha_vote_send.c b/src/controller/testsuite/test_ha_vote_send.c index 7de59f9..89daee6 100644 --- a/src/controller/testsuite/test_ha_vote_send.c +++ b/src/controller/testsuite/test_ha_vote_send.c @@ -654,6 +654,236 @@ static void test_bug1417_middle_index_real_vote_from_peer2_not_dropped(void) printf("test_bug1417_middle_index_real_vote_from_peer2_not_dropped: PASS\n"); } +/* ── raft-adapter-conformance task 3.1: post-connect vote failure routing ── + * + * vote_ep_err_handler's election-phase branch (the iomgr err_handler fired + * when an already-connected outgoing vote endpoint fails/closes before a + * reply arrives) must count that outcome through vote_reply_dispatch -- the + * SAME production tally path a connect-time failure (raft_cb_send_vote_request's + * own rc<0 branches, bug-1423) or a delivered denial (vote_reply_msg_handler) + * uses -- not the legacy handle_request_vote_reply, which bypasses + * raft_on_vote_reply entirely and, critically for this test, never reaches the + * xce_vote_reply_hook seam vote_reply_dispatch checks. + * + * Test seam: xce_vote_reply_hook (checked ONLY inside vote_reply_dispatch) lets + * us observe, without a live iomgr/raft election, whether the post-connect + * failure reached the production tally path. Pre-fix, this hook is never + * invoked by vote_ep_err_handler's election branch -- proving the bug. + */ + +extern int vote_ep_err_handler_for_test(endpoint_t *ep); + +static void test_post_connect_vote_failure_routes_through_production_tally(void) +{ + reset_reply_mock(); + + ha_state_t ha; + TEST_ASSERT_EQUAL_INT(0, ha_init(&ha, &g_vote_cfg, 0)); + /* Election phase, not CTRL_PRIMARY -- exercises the "else" branch. */ + atomic_store_explicit(&ha.role, CTRL_ELECTING, memory_order_release); + atomic_store_explicit(&ha.term, 4ULL, memory_order_release); + + ha_elect_ctx_t *ctx = alloc_ctx_for_vote(2); + pthread_mutex_init(&ctx->lock, NULL); + + endpoint_t ep; + make_endpoint(&ep); + + /* Build a real-vote endpoint context as if raft_cb_send_vote_request had + * already connected it (on_vote_connected fired, request sent) -- then + * the connection fails before any reply arrives: iomgr invokes the + * registered err_handler on this same ep. */ + vote_ep_ctx_build_for_test(&ep, &ha, ctx, /*peer_idx=*/0, + 4ULL, 100ULL, 50ULL, "ctrl-a"); + + int rc = vote_ep_err_handler_for_test(&ep); + TEST_ASSERT_EQUAL_INT(0, rc); + + TEST_ASSERT_EQUAL_INT_MESSAGE(1, g_reply_hook_calls, + "post-connect vote failure must reach vote_reply_dispatch's tally " + "(xce_vote_reply_hook), not the legacy handle_request_vote_reply path " + "which never invokes this hook"); + TEST_ASSERT_EQUAL_INT_MESSAGE(0, g_reply_granted, + "a post-connect failure must be counted as a denied vote (granted=0)"); + TEST_ASSERT_EQUAL_UINT64_MESSAGE(4ULL, g_reply_term, + "the synthesized denial must carry the candidate's own term"); + TEST_ASSERT_EQUAL_INT_MESSAGE(0, g_reply_peer_idx, + "peer_idx must match the failed endpoint's vote_ep_ctx_t peer_idx"); + + free(ep.data); + free_ctx_for_vote(ctx); + ha_fini(&ha); + printf("test_post_connect_vote_failure_routes_through_production_tally: PASS\n"); +} + +/* ── raft-adapter-conformance task 3.2: post-connect PreVote failure routing ── + * + * pre_vote_ep_err_handler's election-phase branch (task 3.1) must count a + * post-connect PreVote endpoint failure through pre_vote_reply_dispatch -- + * the SAME production tally path a connect-time failure or a delivered + * PreVote reply uses -- not a legacy no-op path. Requirement 4.3 (mirror of + * 4.2 for the PreVote endpoint kind). + * + * Test seam: pre_vote_reply_dispatch has no mock hook analogous to + * xce_vote_reply_hook (it calls raft_on_pre_vote_reply directly). Instead we + * assert directly on raft_state_t's own PreVote tally fields + * (pre_vote_replies[], pre_votes_granted, pre_vote_in_progress) -- the same + * fields test_ha_prevote.c already asserts on for the delivered-reply path + * (pre_vote_reply_dispatch_for_test). Pre-fix, pre_vote_ep_err_handler routed + * this failure through the legacy handle_request_vote_reply path, which never + * touches raft_on_pre_vote_reply or these fields -- so pre_vote_replies[1] + * would stay 0 and this test would fail against pre-fix code. + */ + +extern int pre_vote_ep_err_handler_for_test(endpoint_t *ep); + +extern void pre_vote_reply_dispatch_for_test(ha_state_t *ha, cluster_t *c, + int peer_idx, int granted); + +/* A LOST round re-arms the liveness watchdog (ha_prevote_rearm_liveness). + * With the hook unset that falls through to the real + * ha_arm_heartbeat_timeout_vtask, which -- with c==NULL in unit-test mode -- + * calloc's a ctx into the static s_liveness_ctx and never arms a delaymgr + * task to free it (delay_task_ms is gated on `c && c->delaymgr.running`), + * leaking it and leaving a stale pointer into this test's stack-local `ha` + * once the test returns. test_ha_prevote.c avoids this identical hazard on + * its own LOST-path tests via the same hook override -- mirrored here. */ +extern int (*ha_prevote_rearm_liveness_hook)(ha_state_t *ha, cluster_t *c); + +static int stub_prevote_rearm_liveness(ha_state_t *ha, cluster_t *c) +{ + (void)ha; (void)c; + return 0; +} + +/* Build a 3-node (self + 2 peers) PreVote round in progress, mirroring + * test_ha_prevote.c's make_three_node + ha_start_prevote_async(&ha, NULL) + * fixture: role stays CTRL_STANDBY (the real production role throughout a + * PreVote round -- a node only becomes CTRL_ELECTING after WINNING the + * round), self-grant is recorded by the real raft_begin_pre_vote, and both + * non-self peers (absolute index 1 and 2) start unreplied. */ +static void start_three_node_prevote_round(ha_state_t *ha) +{ + ha_do_demote(ha); + ha->raft.n_peers = 3; + ha->raft.self_idx = ha->my_priority; /* my_priority == 0 for this fixture */ + ha->raft.role = RAFT_FOLLOWER; + ha->n_peers = 3; + + ha_start_prevote_async(ha, NULL); +} + +static void test_post_connect_prevote_failure_routes_through_production_tally(void) +{ + ha_state_t ha; + TEST_ASSERT_EQUAL_INT(0, ha_init(&ha, &g_vote_cfg, 0)); + atomic_store_explicit(&ha.term, 4ULL, memory_order_release); + + start_three_node_prevote_round(&ha); + TEST_ASSERT_EQUAL_INT_MESSAGE(1, ha.raft.pre_vote_in_progress, + "round must be in progress before the failure arrives"); + TEST_ASSERT_EQUAL_INT_MESSAGE(1, ha.raft.pre_votes_granted, + "self-grant must already be recorded by raft_begin_pre_vote"); + + ha_elect_ctx_t *ctx = alloc_ctx_for_vote(2); + pthread_mutex_init(&ctx->lock, NULL); + + endpoint_t ep; + make_endpoint(&ep); + + /* Build a PreVote endpoint context as if raft_cb_send_pre_vote_request had + * already connected it (on_vote_connected fired, request sent) -- then + * the connection fails before any reply arrives: iomgr invokes the + * registered err_handler (pre_vote_ep_err_handler) on this same ep. */ + vote_ep_ctx_build_for_test(&ep, &ha, ctx, /*peer_idx=*/1, + 4ULL, 100ULL, 50ULL, "ctrl-a"); + + int rc = pre_vote_ep_err_handler_for_test(&ep); + TEST_ASSERT_EQUAL_INT(0, rc); + + TEST_ASSERT_EQUAL_INT_MESSAGE(1, ha.raft.pre_vote_replies[1], + "post-connect PreVote failure must reach pre_vote_reply_dispatch's " + "tally (raft_on_pre_vote_reply), not a legacy no-op path"); + TEST_ASSERT_EQUAL_INT_MESSAGE(1, ha.raft.pre_votes_granted, + "a post-connect PreVote failure must be counted as NOT granted " + "(pre_votes_granted stays at the self-grant only)"); + TEST_ASSERT_EQUAL_INT_MESSAGE(1, ha.raft.pre_vote_in_progress, + "round stays pending -- only 1 of 2 non-self peers has been counted, " + "no quorum(2) or all-replied(2) condition met yet"); + + free(ep.data); + free_ctx_for_vote(ctx); + ha_fini(&ha); + printf("test_post_connect_prevote_failure_routes_through_production_tally: PASS\n"); +} + +/* ── raft-adapter-conformance task 3.2: fast quorum decision (Req 4.5) ──────── + * + * Once every peer in a PreVote round has had its outcome counted -- whether + * via a delivered reply or via this post-connect failure mode -- the round + * must reach its quorum decision immediately (synchronously inside the + * counting call), without waiting for the round's full timeout + * (ha_prevote_round_timeout_fn is never invoked in this test). Mixes both + * counting paths in the same round to prove the failure path is a full + * first-class participant in the fast "all replied" decision, not merely + * counted without unblocking the round. + */ +static void test_prevote_round_reaches_quorum_decision_via_fast_tally(void) +{ + ha_state_t ha; + TEST_ASSERT_EQUAL_INT(0, ha_init(&ha, &g_vote_cfg, 0)); + atomic_store_explicit(&ha.term, 4ULL, memory_order_release); + + start_three_node_prevote_round(&ha); + + /* This test's mixed round decides LOST (below), which re-arms the + * liveness watchdog -- stub it out so the real (c==NULL) production path + * is never exercised here (see extern decl comment above). */ + ha_prevote_rearm_liveness_hook = stub_prevote_rearm_liveness; + + ha_elect_ctx_t *ctx = alloc_ctx_for_vote(2); + pthread_mutex_init(&ctx->lock, NULL); + + /* Peer 1: post-connect endpoint failure -- counted via + * pre_vote_ep_err_handler (the fix under test). */ + endpoint_t ep1; + make_endpoint(&ep1); + vote_ep_ctx_build_for_test(&ep1, &ha, ctx, /*peer_idx=*/1, + 4ULL, 100ULL, 50ULL, "ctrl-a"); + TEST_ASSERT_EQUAL_INT(0, pre_vote_ep_err_handler_for_test(&ep1)); + + TEST_ASSERT_EQUAL_INT_MESSAGE(1, ha.raft.pre_vote_in_progress, + "round must still be pending -- peer 2's outcome is not counted yet"); + + /* Peer 2: a normal delivered denial through the production reply-dispatch + * path -- the same tally the post-connect failure above also reaches. */ + pre_vote_reply_dispatch_for_test(&ha, NULL, /*peer_idx=*/2, /*granted=*/0); + + /* Every non-self peer's outcome is now counted (one via the post-connect + * failure path, one via a delivered reply) -- the round must reach its + * LOST decision immediately, without any call into + * ha_prevote_round_timeout_fn (Requirement 4.5's fast "all replied" + * path). */ + TEST_ASSERT_EQUAL_INT_MESSAGE(0, ha.raft.pre_vote_in_progress, + "Req 4.5: once every peer outcome is counted -- including a " + "post-connect failure -- the round must reach its quorum decision " + "without waiting for the round's full timeout"); + TEST_ASSERT_EQUAL_INT_MESSAGE(1, ha.raft.pre_votes_granted, + "neither non-self peer granted -- self-grant only, quorum(2) never " + "reached"); + TEST_ASSERT_EQUAL_INT_MESSAGE(CTRL_STANDBY, + (int)atomic_load_explicit(&ha.role, memory_order_acquire), + "a LOST PreVote round leaves the node CTRL_STANDBY (Req 1.4, " + "unchanged by this fix)"); + + ha_prevote_rearm_liveness_hook = NULL; /* reset -- do not leak into other tests */ + + free(ep1.data); + free_ctx_for_vote(ctx); + ha_fini(&ha); + printf("test_prevote_round_reaches_quorum_decision_via_fast_tally: PASS\n"); +} + /* ── Suite entry point ───────────────────────────────────────────────────── */ void test_ha_vote_send(void) @@ -670,4 +900,9 @@ void test_ha_vote_send(void) RUN_TEST(test_vote_reply_handler_no_uaf); /* bug-1417 */ RUN_TEST(test_bug1417_middle_index_real_vote_from_peer2_not_dropped); + /* raft-adapter-conformance task 3.1 */ + RUN_TEST(test_post_connect_vote_failure_routes_through_production_tally); + /* raft-adapter-conformance task 3.2 */ + RUN_TEST(test_post_connect_prevote_failure_routes_through_production_tally); + RUN_TEST(test_prevote_round_reaches_quorum_decision_via_fast_tally); } diff --git a/src/controller/testsuite/test_persist_snapshot_entities.c b/src/controller/testsuite/test_persist_snapshot_entities.c index 3d04254..433bdd7 100644 --- a/src/controller/testsuite/test_persist_snapshot_entities.c +++ b/src/controller/testsuite/test_persist_snapshot_entities.c @@ -52,6 +52,7 @@ #include #include +#include #include #include #include @@ -66,9 +67,12 @@ #include #include "cluster.h" +#include "config_repl.h" #include "controller.capnp.h" #include "jobj.h" +#include "myconf.h" #include "qobj.h" +#include "wobj.h" #include "xce/cluster_def.h" #include "xce/types.h" #include "xstring.h" @@ -113,6 +117,48 @@ static uint32_t snapent_queue_status(int i) return g_snapent_queue_statuses[i % (int)SNAPENT_N_QUEUE_STATUSES]; } +/* Host admin-status seed values (task 2.1, Req 1.6/1.7). Deliberately + * includes a ZERO entry (a host with no admin action ever taken -- the + * "collect every host, some just have status=0" case: collect_host_frames + * applies no retention predicate, mirroring collect_queue_frames) and a + * multi-bit combination, alongside single-bit CLOSED_BY_ADMIN/LOCKEDU + * cases. */ +static const uint32_t g_snapent_host_admin_statuses[] = { + 0u, + XCE_WORKER_CLOSED_BY_ADMIN, + XCE_WORKER_LOCKEDU, + (XCE_WORKER_CLOSED_BY_ADMIN | XCE_WORKER_HIDDEN), +}; +#define SNAPENT_N_HOST_ADMIN_STATUSES \ + (sizeof(g_snapent_host_admin_statuses) / sizeof(g_snapent_host_admin_statuses[0])) + +/* Dynamic/non-admin bits ORed onto every seeded host's REAL status + * alongside its admin bits (Requirement 1.7): a seeded host's frame must + * exclude these even though they are set on the live worker_t, proving + * collect_host_frames actually masks with PERSIST_WORKER_ADMIN_MASK rather + * than merely happening to equal the admin bits because nothing else was + * ever set. */ +#define SNAPENT_HOST_DYNAMIC_BITS (XCE_WORKER_UNAVAIL | XCE_WORKER_BUSY) + +/* Mask covering exactly the bits g_snapent_host_admin_statuses ever + * combines (config-upgrade-snapshot task 4's end-to-end restore test) -- + * disjoint from SNAPENT_HOST_DYNAMIC_BITS above by construction, so a + * restored worker's status can be checked for "contains exactly these + * admin bits" without depending on persist.c's own internal + * PERSIST_WORKER_ADMIN_MASK #define. */ +#define SNAPENT_HOST_ADMIN_STATUS_MASK \ + (XCE_WORKER_CLOSED_BY_ADMIN | XCE_WORKER_LOCKEDU | XCE_WORKER_HIDDEN) + +static void snapent_host_name(int i, char* buf, size_t buf_sz) +{ + snprintf(buf, buf_sz, "snapent-host%d", i); +} + +static uint32_t snapent_host_admin_status(int i) +{ + return g_snapent_host_admin_statuses[i % (int)SNAPENT_N_HOST_ADMIN_STATUSES]; +} + /* Deterministic, distinguishing submit-payload values per seeded job index * (task 2.1 / Implementation Notes: richer than an all-zeroed submit, so a * round-trip's field-by-field comparison is meaningful). Only the fields the @@ -140,6 +186,11 @@ static void snapent_job_cmdline(int i, char* buf, size_t buf_sz) typedef struct { cluster_t* c; char tmpdir[256]; + /* Only populated/wired (f->c->myconf = &f->myconf) by tests that call + * snapent_wire_myconf -- task 2.3's config-bytes-section tests. Every + * other existing test leaves f->c->myconf NULL, exactly as before this + * field was added (zero footprint on already-passing tests). */ + myconf_t myconf; } snapent_fixture_t; /* jobj.c's jobsub/startinfo tables are process-global and idempotently @@ -210,8 +261,40 @@ static void snapent_seed_queues(cluster_t* c, int m) } } +/* Seeds n hosts directly into c->workermgr via makeWorker -- the same + * makeWorker()-without-join precedent create_lost_and_found (config_repl.c) + * uses, standing in for a real join the way seeded jobs/queues stand in for + * their own real insertion paths. Each host's REAL status carries its + * admin bits (snapent_host_admin_status) PLUS dynamic/liveness bits + * (SNAPENT_HOST_DYNAMIC_BITS) so a round-trip test can prove the collected + * frame excludes the latter (Requirement 1.7), not merely happens to match + * because nothing else was set. */ +static void snapent_seed_hosts(cluster_t* c, int n) +{ + for (int i = 0; i < n; i++) { + char name[32]; + snapent_host_name(i, name, sizeof(name)); + + hostattrs_t attrs; + memset(&attrs, 0, sizeof(attrs)); + + xce_worker_t hdef; + memset(&hdef, 0, sizeof(hdef)); + hdef.name = name; + hdef.attrs = &attrs; /* makeWorker's copy_worker requires non-NULL attrs */ + hdef.status = snapent_host_admin_status(i) | SNAPENT_HOST_DYNAMIC_BITS; + + TEST_ASSERT_NOT_NULL_MESSAGE(makeWorker(c->workermgr, &hdef), + "seed host insertion must succeed"); + } +} + /* make an entity-snapshot fixture: a real persist_t (private tmpdir) embedded * in a minimal cluster_t whose jobmgr/qmgr are seeded with n_jobs/m_queues. + * workermgr is always created (empty) too -- tests that need hosts call + * snapent_seed_hosts explicitly afterward (task 2.1), mirroring how + * n_jobs/m_queues seed at construction time but keeping every existing + * 2-argument call site unchanged. * persist_init registers the cluster back-pointer (p->cluster) so future * write_snapshot/load_snapshot entity collection can walk c->jobmgr/c->qmgr — * the same access path collect_jobs/collect_queues (dataex.c) use. */ @@ -223,6 +306,9 @@ static snapent_fixture_t* snapent_make(int n_jobs, int m_queues) kvmgr_params_t str_params = { .key_type = KVMGR_KEY_STRING, .nslots = 64, .delta = 16 }; + kvmgr_params_t worker_str_params = { .key_type = KVMGR_KEY_STRING, + .nslots = 64, + .delta = 16 }; snapent_fixture_t* f = calloc(1, sizeof(*f)); if (f == NULL) @@ -241,10 +327,12 @@ static snapent_fixture_t* snapent_make(int n_jobs, int m_queues) TEST_ASSERT_EQUAL_INT( 0, xce_hook_init(&f->c->hooksys, XCE_CONTROLLER_HOOK_MAX)); - f->c->jobmgr = makeInstance(&xkvmgr_type, &int_params); - f->c->qmgr = makeInstance(&xkvmgr_type, &str_params); + f->c->jobmgr = makeInstance(&xkvmgr_type, &int_params); + f->c->qmgr = makeInstance(&xkvmgr_type, &str_params); + f->c->workermgr = makeInstance(&xkvmgr_type, &worker_str_params); TEST_ASSERT_NOT_NULL(f->c->jobmgr); TEST_ASSERT_NOT_NULL(f->c->qmgr); + TEST_ASSERT_NOT_NULL(f->c->workermgr); zarray_init(&f->c->sharedinst, 64, NULL); if (!g_snapent_jobobj_ready) { @@ -267,6 +355,29 @@ static snapent_fixture_t* snapent_make(int n_jobs, int m_queues) return f; } +/* Wire a real myconf_t onto the fixture's cluster (config-upgrade-snapshot + * task 2.3): f->myconf.workdir/name are set to the SAME (f->tmpdir, + * "snapent") pair persist_set_workdir already used above -- exactly mirroring + * production wiring, where a single controller instance's persist_set_workdir + * and c->myconf->workdir/name are literally the same values (cluster.c:1408- + * 1441). effective_dir = workdir/name is therefore shared between persist's + * OWN data/{wal,snap} subtree and myconf's conf/ subtree with no collision + * (different subdirectories under the same instance root), the same layout a + * real controller process has on disk. + * + * Does NOT write any config bytes itself -- callers that need real bytes on + * disk call conf_save_config() afterward (config_repl.h); a caller that + * wires myconf but never saves anything is deliberately exercising the + * "live cluster, no config pushed yet" -ENOENT path in + * read_active_config_bytes (persist.c). */ +static void snapent_wire_myconf(snapent_fixture_t* f) +{ + f->myconf.workdir = f->tmpdir; + f->myconf.name = (char*)"snapent"; + f->myconf.conf_keep_n = 2; + f->c->myconf = &f->myconf; +} + static void snapent_teardown(snapent_fixture_t* f) { if (f == NULL) @@ -276,10 +387,16 @@ static void snapent_teardown(snapent_fixture_t* f) persist_fini(&f->c->persist); zarray_fini(&f->c->sharedinst); - if (f->c->qmgr) dereference(f->c->qmgr); - if (f->c->jobmgr) dereference(f->c->jobmgr); + if (f->c->qmgr) dereference(f->c->qmgr); + if (f->c->jobmgr) dereference(f->c->jobmgr); + if (f->c->workermgr) dereference(f->c->workermgr); xce_hook_fini(&f->c->hooksys); + /* free(NULL) is safe -- conffile is only heap-allocated (via + * conf_save_config's asprintf) when a test actually wired+saved a real + * config; every other test leaves it at its calloc'd NULL. */ + free(f->myconf.conffile); + free(f->c); free(f); } @@ -309,6 +426,21 @@ static queue_t* snapent_find_queue(cluster_t* c, const char* name) return (found > 0) ? q : NULL; } +/* Lookup helper for host restore assertions (config-upgrade-snapshot task 4) + * -- mirrors snapent_find_job/snapent_find_queue above exactly, over + * c->workermgr. */ +static worker_t* snapent_find_worker(cluster_t* c, const char* name) +{ + worker_t* w = NULL; + int found = 0; + + lock(c->workermgr, RTTI_LOCK_READ); + found = key_find(c->workermgr, (void*)name, (void**)&w); + unlock(c->workermgr); + + return (found > 0) ? w : NULL; +} + /* ------------------------------------------------------------------ */ /* Test 1: fixture seeds N jobs (varying state) + M queues (varying */ /* status) and both are independently observable via key_find */ @@ -375,7 +507,8 @@ static void test_snapent_fixture_seeds_jobs_and_queues(void) /* ------------------------------------------------------------------ */ #define SNAPENT_LEGACY_HEADER_BYTES (16 + 1 + 8 + 32) -#define SNAPENT_TEST_FORMAT_VERSION 1u +#define SNAPENT_TEST_FORMAT_VERSION 2u /* must match persist.c's SNAPSHOT_FORMAT_VERSION + * (config-upgrade-snapshot task 1 bumped 1->2) */ #define SNAPENT_MAX_DECODE_PAYLOAD (16u * 1024 * 1024) /* Decodes every job frame in the checkpoint at `path` into `out` @@ -754,20 +887,23 @@ static void test_snapent_checkpoint_mid_encode_failure_discards_whole_file(void) } /* ------------------------------------------------------------------ */ -/* Test-local raw checkpoint reader for the queue section (task 3.1). */ +/* Test-local raw checkpoint reader for the queue section */ +/* (config-upgrade-snapshot task 2.2). */ /* */ /* This task's boundary is write_snapshot ONLY -- load_snapshot's entity */ -/* restore is task 5.x's job (see design.md Requirement 2), mirroring */ -/* the job-section reader above (task 2.2 remediation note). Reads the */ -/* checkpoint's on-disk bytes directly per design.md's exact "Checkpoint */ -/* File Layout (Physical)": */ +/* restore is task 4's job (design.md Requirement 5.7), mirroring the */ +/* host-section reader below (task 2.1's own remediation note). Reads */ +/* the checkpoint's on-disk bytes directly per design.md's "Logical Data */ +/* Model" checkpoint file layout, SNAPSHOT_FORMAT_VERSION=2: */ /* [57-byte legacy sentinel][uint32_t format_version] */ /* [uint32_t job_count][job_count * {payload_len; capnp Job bytes}] */ -/* [uint32_t queue_count] */ -/* [queue_count * {uint32_t name_len; char name[name_len]; status}] */ -/* Skips past the job section (whatever it contains) to reach the queue */ -/* section, so this reader works regardless of how many jobs a fixture */ -/* also seeded. */ +/* [uint32_t queue_count][queue_count * {payload_len; capnp */ +/* QueueAdminState bytes}] */ +/* Migrated from the prior raw {name_len, name, status} layout (Req */ +/* 1.9, 5.7) -- same [payload_len][capnp bytes] shape the job/host */ +/* sections already use. Skips past the job section (whatever it */ +/* contains) to reach the queue section, so this reader works */ +/* regardless of how many jobs a fixture also seeded. */ /* ------------------------------------------------------------------ */ #define SNAPENT_MAX_QNAME_LEN 63 @@ -838,6 +974,12 @@ static int snapent_read_checkpoint_queues(const char* path, } } + /* Queue section (this task's actual boundary): queue_count + per-queue + * [payload_len][capnp QueueAdminState bytes] -- migrated from the + * prior raw {name_len, name, status} layout. Decoded via the same + * generated read_QueueAdminState/decode_QueueAdminState helpers + * load_snapshot's future restore step (task 4) will use, mirroring + * how the host-section reader below decodes HostAdminState. */ uint32_t queue_count = 0; if (read(fd, &queue_count, sizeof(queue_count)) != (ssize_t)sizeof(queue_count)) { @@ -847,34 +989,49 @@ static int snapent_read_checkpoint_queues(const char* path, int n = 0; for (uint32_t i = 0; i < queue_count; i++) { - uint32_t name_len = 0; - if (read(fd, &name_len, sizeof(name_len)) != (ssize_t)sizeof(name_len)) { + uint32_t payload_len = 0; + if (read(fd, &payload_len, sizeof(payload_len)) != + (ssize_t)sizeof(payload_len)) { close(fd); return -1; } - if (name_len == 0 || name_len > SNAPENT_MAX_QNAME_LEN) { + if (payload_len == 0 || payload_len > SNAPENT_MAX_DECODE_PAYLOAD) { close(fd); return -1; } - char namebuf[SNAPENT_MAX_QNAME_LEN + 1]; - if (read(fd, namebuf, name_len) != (ssize_t)name_len) { + uint8_t* buf = (uint8_t*)malloc(payload_len); + if (buf == NULL) { close(fd); return -1; } - namebuf[name_len] = '\0'; - - uint32_t status = 0; - if (read(fd, &status, sizeof(status)) != (ssize_t)sizeof(status)) { + if (read(fd, buf, payload_len) != (ssize_t)payload_len) { + free(buf); close(fd); return -1; } if (n < max_out) { - snprintf(out[n].name, sizeof(out[n].name), "%s", namebuf); - out[n].status = status; + struct capn c_ctx; + capn_init_mem(&c_ctx, buf, payload_len, 0); + QueueAdminState_ptr qp; + qp.p = capn_getp(capn_root(&c_ctx), 0, 1); + struct QueueAdminState cq; + memset(&cq, 0, sizeof(cq)); + read_QueueAdminState(&cq, qp); + + capnp_queue_admin_state_t decoded; + memset(&decoded, 0, sizeof(decoded)); + decode_QueueAdminState(&decoded, &cq); + capn_free(&c_ctx); + + snprintf(out[n].name, sizeof(out[n].name), "%s", + decoded.name ? decoded.name : ""); + out[n].status = decoded.status; + free_QueueAdminState(&decoded); n++; } + free(buf); } close(fd); @@ -941,6 +1098,593 @@ static void test_snapent_checkpoint_queue_status_roundtrip(void) printf("test_snapent_checkpoint_queue_status_roundtrip: PASS\n"); } +/* ------------------------------------------------------------------ */ +/* Test-local raw checkpoint reader for the host section (task 2.1). */ +/* */ +/* This task's boundary is write_snapshot ONLY -- load_snapshot's host */ +/* restore is task 3/4's job (design.md "Host Restore"), mirroring the */ +/* job/queue readers above. Reads the checkpoint's on-disk bytes */ +/* directly per design.md's "Checkpoint File Layout": */ +/* [57-byte legacy sentinel][uint32_t format_version] */ +/* [uint32_t job_count][job_count * {payload_len; capnp Job bytes}] */ +/* [uint32_t queue_count][queue_count * {name_len; name; status}] */ +/* [uint32_t host_count][host_count * {payload_len; capnp */ +/* HostAdminState bytes}] */ +/* The queue section is still the pre-task-2.2 raw layout (this task */ +/* does not touch collect_queue_frames), so it is skipped using the */ +/* same raw shape snapent_read_checkpoint_queues above parses, not */ +/* capnp-decoded here -- only the host section, this task's actual */ +/* boundary, is decoded via read_HostAdminState/decode_HostAdminState, */ +/* the same generated helpers restore_host_state (task 3) will use. */ +/* ------------------------------------------------------------------ */ + +#define SNAPENT_MAX_HNAME_LEN 63 + +typedef struct { + char name[SNAPENT_MAX_HNAME_LEN + 1]; + uint32_t status; +} snapent_decoded_host_t; + +/* Reads every host frame in the checkpoint at `path` into `out` + * (caller-allocated array of `max_out` slots). Returns the number of + * frames decoded (<= host_count on disk, capped at max_out), or -1 on any + * structural read error (bad magic, bad/absent format_version, short + * read, oversized job/queue/host payload_len or queue name_len). */ +static int snapent_read_checkpoint_hosts(const char* path, + snapent_decoded_host_t* out, + int max_out) +{ + int fd = open(path, O_RDONLY); + if (fd < 0) + return -1; + + char header[SNAPENT_LEGACY_HEADER_BYTES]; + if (read(fd, header, sizeof(header)) != (ssize_t)sizeof(header) || + memcmp(header, "XCESNAP\0", 8) != 0) { + close(fd); + return -1; + } + + uint32_t format_version = 0; + if (read(fd, &format_version, sizeof(format_version)) != + (ssize_t)sizeof(format_version) || + format_version != SNAPENT_TEST_FORMAT_VERSION) { + close(fd); + return -1; + } + + /* Skip the entire job section. */ + uint32_t job_count = 0; + if (read(fd, &job_count, sizeof(job_count)) != (ssize_t)sizeof(job_count)) { + close(fd); + return -1; + } + for (uint32_t i = 0; i < job_count; i++) { + uint32_t payload_len = 0; + if (read(fd, &payload_len, sizeof(payload_len)) != + (ssize_t)sizeof(payload_len)) { + close(fd); + return -1; + } + if (payload_len == 0 || payload_len > SNAPENT_MAX_DECODE_PAYLOAD) { + close(fd); + return -1; + } + uint8_t* discard = (uint8_t*)malloc(payload_len); + if (discard == NULL) { + close(fd); + return -1; + } + ssize_t got = read(fd, discard, payload_len); + free(discard); + if (got != (ssize_t)payload_len) { + close(fd); + return -1; + } + } + + /* Skip the entire queue section -- migrated to capnp QueueAdminState + * frames (task 2.2, Req 1.9/5.7); skip shape now matches the job + * section's [payload_len][capnp bytes] framing exactly, no longer the + * old raw {name_len, name, status} layout. */ + uint32_t queue_count = 0; + if (read(fd, &queue_count, sizeof(queue_count)) != + (ssize_t)sizeof(queue_count)) { + close(fd); + return -1; + } + for (uint32_t i = 0; i < queue_count; i++) { + uint32_t payload_len = 0; + if (read(fd, &payload_len, sizeof(payload_len)) != + (ssize_t)sizeof(payload_len)) { + close(fd); + return -1; + } + if (payload_len == 0 || payload_len > SNAPENT_MAX_DECODE_PAYLOAD) { + close(fd); + return -1; + } + uint8_t* discard = (uint8_t*)malloc(payload_len); + if (discard == NULL) { + close(fd); + return -1; + } + ssize_t got = read(fd, discard, payload_len); + free(discard); + if (got != (ssize_t)payload_len) { + close(fd); + return -1; + } + } + + /* Host section (task 2.1's actual boundary): host_count + per-host + * [payload_len][capnp HostAdminState bytes]. */ + uint32_t host_count = 0; + if (read(fd, &host_count, sizeof(host_count)) != + (ssize_t)sizeof(host_count)) { + close(fd); + return -1; + } + + int n = 0; + for (uint32_t i = 0; i < host_count; i++) { + uint32_t payload_len = 0; + if (read(fd, &payload_len, sizeof(payload_len)) != + (ssize_t)sizeof(payload_len)) { + close(fd); + return -1; + } + if (payload_len == 0 || payload_len > SNAPENT_MAX_DECODE_PAYLOAD) { + close(fd); + return -1; + } + + uint8_t* buf = (uint8_t*)malloc(payload_len); + if (buf == NULL) { + close(fd); + return -1; + } + if (read(fd, buf, payload_len) != (ssize_t)payload_len) { + free(buf); + close(fd); + return -1; + } + + if (n < max_out) { + struct capn c_ctx; + capn_init_mem(&c_ctx, buf, payload_len, 0); + HostAdminState_ptr hp; + hp.p = capn_getp(capn_root(&c_ctx), 0, 1); + struct HostAdminState ch; + memset(&ch, 0, sizeof(ch)); + read_HostAdminState(&ch, hp); + + capnp_host_admin_state_t decoded; + memset(&decoded, 0, sizeof(decoded)); + decode_HostAdminState(&decoded, &ch); + capn_free(&c_ctx); + + snprintf(out[n].name, sizeof(out[n].name), "%s", + decoded.name ? decoded.name : ""); + out[n].status = decoded.status; + free_HostAdminState(&decoded); + n++; + } + free(buf); + } + + close(fd); + return n; +} + +/* Reads the trailing config-bytes section a checkpoint file carries + * (config-upgrade-snapshot task 2.3, Req 2.1, 2.3, 2.4, 5.1): skips past the + * legacy header + format_version + job/queue/host sections exactly like + * snapent_read_checkpoint_hosts above, then reads the final + * [config_bytes_len][raw config bytes] blob -- the single flat section that + * comes after every other section, never a [count][frame...] shape. + * + * On success returns 0 with *out_bytes (caller must free(), NULL when + * out_len is 0) / *out_len set. Returns -1 on any parse/read failure + * (malformed header, truncated section, etc.) -- mirrors every other + * snapent_read_checkpoint_* reader's -1-on-failure convention in this file. */ +static int snapent_read_checkpoint_config_bytes(const char* path, + uint8_t** out_bytes, + size_t* out_len) +{ + int fd = open(path, O_RDONLY); + if (fd < 0) + return -1; + + char header[SNAPENT_LEGACY_HEADER_BYTES]; + if (read(fd, header, sizeof(header)) != (ssize_t)sizeof(header) || + memcmp(header, "XCESNAP\0", 8) != 0) { + close(fd); + return -1; + } + + uint32_t format_version = 0; + if (read(fd, &format_version, sizeof(format_version)) != + (ssize_t)sizeof(format_version) || + format_version != SNAPENT_TEST_FORMAT_VERSION) { + close(fd); + return -1; + } + + /* Skip job, queue, and host sections -- all three share the same + * [count][payload_len][bytes]* shape by this point (task 2.2 migrated + * queue frames to capnp, matching job/host). */ + for (int section = 0; section < 3; section++) { + uint32_t count = 0; + if (read(fd, &count, sizeof(count)) != (ssize_t)sizeof(count)) { + close(fd); + return -1; + } + for (uint32_t i = 0; i < count; i++) { + uint32_t payload_len = 0; + if (read(fd, &payload_len, sizeof(payload_len)) != + (ssize_t)sizeof(payload_len)) { + close(fd); + return -1; + } + if (payload_len == 0 || payload_len > SNAPENT_MAX_DECODE_PAYLOAD) { + close(fd); + return -1; + } + uint8_t* discard = (uint8_t*)malloc(payload_len); + if (discard == NULL) { + close(fd); + return -1; + } + ssize_t got = read(fd, discard, payload_len); + free(discard); + if (got != (ssize_t)payload_len) { + close(fd); + return -1; + } + } + } + + /* Config-bytes section: config_bytes_len + raw bytes (no per-item + * framing -- exactly one blob for the whole file). */ + uint32_t cfg_len = 0; + if (read(fd, &cfg_len, sizeof(cfg_len)) != (ssize_t)sizeof(cfg_len)) { + close(fd); + return -1; + } + if (cfg_len > SNAPENT_MAX_DECODE_PAYLOAD) { + close(fd); + return -1; + } + + uint8_t* buf = NULL; + if (cfg_len > 0) { + buf = (uint8_t*)malloc(cfg_len); + if (buf == NULL) { + close(fd); + return -1; + } + if (read(fd, buf, cfg_len) != (ssize_t)cfg_len) { + free(buf); + close(fd); + return -1; + } + } + + close(fd); + *out_bytes = buf; + *out_len = (size_t)cfg_len; + return 0; +} + +static snapent_decoded_host_t* snapent_find_decoded_host( + snapent_decoded_host_t* hosts, int count, const char* name) +{ + for (int i = 0; i < count; i++) { + if (strcmp(hosts[i].name, name) == 0) + return &hosts[i]; + } + return NULL; +} + +/* ------------------------------------------------------------------ */ +/* Test 6b (task 2.1): every host currently in the live workermgr table */ +/* gets exactly one HostAdminState frame, whose status is EXACTLY the */ +/* host's admin-issued bits (w->host.status & XCE_WORKER_ADMIN_MASK) -- */ +/* never missing an admin bit, never carrying a dynamic/liveness bit */ +/* (Requirements 1.6, 1.7). Covers a host with NO admin bits set too */ +/* (status must decode to exactly 0, not be omitted) -- collect_host_ */ +/* frames applies no retention predicate, mirroring collect_queue_frames.*/ +/* ------------------------------------------------------------------ */ + +static void test_snapent_checkpoint_host_admin_status_roundtrip(void) +{ + const int n_hosts = 4; /* covers every g_snapent_host_admin_statuses entry */ + + snapent_fixture_t* src = snapent_make(0, 0); + TEST_ASSERT_NOT_NULL(src); + + snapent_seed_hosts(src->c, n_hosts); + + TEST_ASSERT_EQUAL_INT(0, persist_checkpoint(&src->c->persist)); + + char path[4096]; + snprintf(path, sizeof(path), "%s/snap-%016" PRIx64 ".capnp", + src->c->persist.snap_path, src->c->persist.checkpoint_lsn); + + snapent_decoded_host_t decoded[8]; + int count = snapent_read_checkpoint_hosts(path, decoded, 8); + TEST_ASSERT_TRUE_MESSAGE(count >= 0, + "checkpoint file must parse as a well-formed entity-bearing " + "payload through the host section"); + TEST_ASSERT_EQUAL_INT_MESSAGE(n_hosts, count, + "checkpoint must contain exactly one HostAdminState frame per host " + "currently in the live workermgr table -- collect_host_frames " + "applies no retention predicate, mirroring collect_queue_frames"); + + for (int i = 0; i < n_hosts; i++) { + char expect_name[32]; + snapent_host_name(i, expect_name, sizeof(expect_name)); + + snapent_decoded_host_t* dh = + snapent_find_decoded_host(decoded, count, expect_name); + TEST_ASSERT_NOT_NULL_MESSAGE(dh, + "checkpoint's raw host frames must contain the seeded host"); + + uint32_t expect_admin = snapent_host_admin_status(i); + TEST_ASSERT_EQUAL_UINT32_MESSAGE(expect_admin, dh->status, + "the frame's status must be EXACTLY the admin-issued bits -- " + "neither missing an admin bit nor carrying a dynamic bit " + "(Requirement 1.6, 1.7)"); + TEST_ASSERT_EQUAL_UINT32_MESSAGE(0, + dh->status & SNAPENT_HOST_DYNAMIC_BITS, + "the frame must never carry the seeded host's dynamic/liveness " + "bits, even though they are set on the live worker_t " + "(Requirement 1.7)"); + } + + snapent_teardown(src); + printf("test_snapent_checkpoint_host_admin_status_roundtrip: PASS\n"); +} + +/* ------------------------------------------------------------------ */ +/* Test 6c (task 2.1): the task's own literal Observable criterion -- a */ +/* checkpoint taken while exactly one host exists, administratively */ +/* closed, contains exactly one HostAdminState frame for it, with ONLY */ +/* the admin bit set (no dynamic fields). */ +/* ------------------------------------------------------------------ */ + +static void test_snapent_checkpoint_closed_host_yields_exactly_one_admin_only_frame(void) +{ + snapent_fixture_t* src = snapent_make(0, 0); + TEST_ASSERT_NOT_NULL(src); + + const char* hostname = "snapent-closed-host"; + hostattrs_t attrs; + memset(&attrs, 0, sizeof(attrs)); + + xce_worker_t hdef; + memset(&hdef, 0, sizeof(hdef)); + hdef.name = (char*)hostname; + hdef.attrs = &attrs; + hdef.status = XCE_WORKER_CLOSED_BY_ADMIN | SNAPENT_HOST_DYNAMIC_BITS; + + TEST_ASSERT_NOT_NULL(makeWorker(src->c->workermgr, &hdef)); + + TEST_ASSERT_EQUAL_INT(0, persist_checkpoint(&src->c->persist)); + + char path[4096]; + snprintf(path, sizeof(path), "%s/snap-%016" PRIx64 ".capnp", + src->c->persist.snap_path, src->c->persist.checkpoint_lsn); + + snapent_decoded_host_t decoded[4]; + int count = snapent_read_checkpoint_hosts(path, decoded, 4); + TEST_ASSERT_TRUE(count >= 0); + TEST_ASSERT_EQUAL_INT_MESSAGE(1, count, + "a checkpoint taken while exactly one host exists (administratively " + "closed) must contain exactly one HostAdminState frame for it"); + + TEST_ASSERT_EQUAL_STRING(hostname, decoded[0].name); + TEST_ASSERT_EQUAL_UINT32_MESSAGE((uint32_t)XCE_WORKER_CLOSED_BY_ADMIN, + decoded[0].status, + "the frame's status must contain ONLY the admin bit -- none of the " + "host's dynamic fields/bits"); + + snapent_teardown(src); + printf("test_snapent_checkpoint_closed_host_yields_exactly_one_admin_only_frame: PASS\n"); +} + +/* ------------------------------------------------------------------ */ +/* Test 6d (task 2.1): no hosts in the live table -> an empty, but */ +/* well-formed, host section (not an error, not a phantom frame). */ +/* ------------------------------------------------------------------ */ + +static void test_snapent_checkpoint_no_hosts_yields_empty_host_section(void) +{ + snapent_fixture_t* src = snapent_make(0, 0); + TEST_ASSERT_NOT_NULL(src); + + TEST_ASSERT_EQUAL_INT(0, persist_checkpoint(&src->c->persist)); + + char path[4096]; + snprintf(path, sizeof(path), "%s/snap-%016" PRIx64 ".capnp", + src->c->persist.snap_path, src->c->persist.checkpoint_lsn); + + snapent_decoded_host_t decoded[4]; + int count = snapent_read_checkpoint_hosts(path, decoded, 4); + TEST_ASSERT_EQUAL_INT_MESSAGE(0, count, + "a checkpoint taken with no hosts in the live workermgr table must " + "have an empty host section, not an error and not a phantom frame"); + + snapent_teardown(src); + printf("test_snapent_checkpoint_no_hosts_yields_empty_host_section: PASS\n"); +} + +/* ─────────────────────────────────────────────────────────────────────── + * config-upgrade-snapshot Task 2.3 (Req 2.1, 2.3, 2.4, 5.1): config-bytes + * section content, absence, and determinism. + * ─────────────────────────────────────────────────────────────────────── */ + +/* A config file test payload -- content is irrelevant to write_snapshot + * (it reads raw bytes, never parses/interprets them), so any distinctive + * byte string proves the round-trip without needing a real ClusterConfig + * capnp blob. */ +static const char SNAPENT_CONFIG_TEST_PAYLOAD[] = + "snapent-config-upgrade-snapshot-task-2.3-test-payload"; + +/* Saves SNAPENT_CONFIG_TEST_PAYLOAD as f's currently-active config via the + * real conf_save_config path (config_repl.c) -- the exact mechanism + * read_active_config_bytes (persist.c) resolves against (conf/current -> + * conf/cluster.bin.). Requires snapent_wire_myconf to have been called + * on f first. */ +static void snapent_save_test_config(snapent_fixture_t* f) +{ + uint8_t sha[32]; + SHA256((const unsigned char*)SNAPENT_CONFIG_TEST_PAYLOAD, + sizeof(SNAPENT_CONFIG_TEST_PAYLOAD) - 1, sha); + TEST_ASSERT_EQUAL_INT(0, + conf_save_config(&f->myconf, (const uint8_t*)SNAPENT_CONFIG_TEST_PAYLOAD, + sizeof(SNAPENT_CONFIG_TEST_PAYLOAD) - 1, sha)); +} + +/* Task 2.3's own literal Observable: a checkpoint's config-bytes section + * content hash matches the currently active configuration -- checked here + * via an exact byte-for-byte memcmp against the source file's own bytes, + * which subsumes a hash match (identical bytes trivially hash identically, + * and is a strictly stronger, more direct assertion). */ +static void test_snapent_checkpoint_config_bytes_section_matches_source_file(void) +{ + snapent_fixture_t* f = snapent_make(0, 0); + TEST_ASSERT_NOT_NULL(f); + + snapent_wire_myconf(f); + snapent_save_test_config(f); + + TEST_ASSERT_EQUAL_INT(0, persist_checkpoint(&f->c->persist)); + + char path[4096]; + snprintf(path, sizeof(path), "%s/snap-%016" PRIx64 ".capnp", + f->c->persist.snap_path, f->c->persist.checkpoint_lsn); + + uint8_t* section_bytes = NULL; + size_t section_len = 0; + TEST_ASSERT_EQUAL_INT_MESSAGE(0, + snapent_read_checkpoint_config_bytes(path, §ion_bytes, §ion_len), + "checkpoint file must parse as a well-formed entity-bearing payload " + "through the trailing config-bytes section"); + + TEST_ASSERT_EQUAL_size_t_MESSAGE(sizeof(SNAPENT_CONFIG_TEST_PAYLOAD) - 1, + section_len, + "config-bytes section length must equal the source config file's " + "exact byte length"); + TEST_ASSERT_EQUAL_MEMORY_MESSAGE(SNAPENT_CONFIG_TEST_PAYLOAD, section_bytes, + section_len, + "config-bytes section content must be byte-for-byte identical to " + "the currently active configuration on disk (Requirement 2.1) -- " + "an exact match trivially implies the content hash also matches"); + + free(section_bytes); + snapent_teardown(f); + printf("test_snapent_checkpoint_config_bytes_section_matches_source_file: PASS\n"); +} + +/* Requirement 2.4's "no config yet" edge: a live cluster (real myconf wired, + * unlike every other test in this file which leaves f->c->myconf NULL) that + * has never received a config push must still produce a valid checkpoint -- + * a zero-length config-bytes section, not a failed checkpoint. Mirrors + * test_snapent_checkpoint_no_hosts_yields_empty_host_section's "absence is + * not failure" shape, one level up (persist.c's read_active_config_bytes + * -ENOENT path). */ +static void test_snapent_checkpoint_config_bytes_section_empty_when_no_local_config(void) +{ + snapent_fixture_t* f = snapent_make(0, 0); + TEST_ASSERT_NOT_NULL(f); + + snapent_wire_myconf(f); /* real myconf, but conf_save_config never called */ + + TEST_ASSERT_EQUAL_INT_MESSAGE(0, persist_checkpoint(&f->c->persist), + "a checkpoint on a live cluster that has not yet received its first " + "config push must still succeed -- absence of local config bytes is " + "a benign early-boot state, never a checkpoint failure"); + + char path[4096]; + snprintf(path, sizeof(path), "%s/snap-%016" PRIx64 ".capnp", + f->c->persist.snap_path, f->c->persist.checkpoint_lsn); + + uint8_t* section_bytes = NULL; + size_t section_len = 0; + TEST_ASSERT_EQUAL_INT(0, + snapent_read_checkpoint_config_bytes(path, §ion_bytes, §ion_len)); + TEST_ASSERT_EQUAL_size_t_MESSAGE(0, section_len, + "no local config bytes exist yet -- the section must be explicitly " + "zero-length, not omitted or a phantom non-empty blob"); + TEST_ASSERT_NULL(section_bytes); + + snapent_teardown(f); + printf("test_snapent_checkpoint_config_bytes_section_empty_when_no_local_config: PASS\n"); +} + +/* Requirement 5.1 determinism: two independent checkpoints taken with the + * SAME active configuration unchanged on disk must produce byte-identical + * config-bytes sections -- a pure function of current on-disk content, no + * timestamp/ordering dependence. + * + * NOTE on why this does NOT also assert the two checkpoints land at + * different LSNs/paths: this fixture is a bare persist_t with no live commit + * engine (snapent_make's own doc comment -- "Deliberately OMITTED ... + * commit engine"), so appending via persist_wal_async never advances + * committed_lsn, and checkpoint_lsn (persist_checkpoint's + * last_applied_lsn snapshot) never moves past its initial value here -- + * both checkpoints legitimately land at the SAME path. That is fine for + * what THIS test checks: write_snapshot's config-bytes-writing logic still + * runs twice, as two genuinely separate persist_checkpoint calls (the + * second's open/write/rename fully redoes the first's, it does not skip or + * cache anything), which is exactly the "independent materialization" + * property Req 5.1 requires -- proving it does not depend on the path + * differing. */ +static void test_snapent_checkpoint_config_bytes_section_deterministic_across_checkpoints(void) +{ + snapent_fixture_t* f = snapent_make(0, 0); + TEST_ASSERT_NOT_NULL(f); + + snapent_wire_myconf(f); + snapent_save_test_config(f); + + TEST_ASSERT_EQUAL_INT(0, persist_checkpoint(&f->c->persist)); + char path1[4096]; + snprintf(path1, sizeof(path1), "%s/snap-%016" PRIx64 ".capnp", + f->c->persist.snap_path, f->c->persist.checkpoint_lsn); + + uint8_t* bytes1 = NULL; size_t len1 = 0; + TEST_ASSERT_EQUAL_INT(0, + snapent_read_checkpoint_config_bytes(path1, &bytes1, &len1)); + + TEST_ASSERT_EQUAL_INT(0, persist_checkpoint(&f->c->persist)); + char path2[4096]; + snprintf(path2, sizeof(path2), "%s/snap-%016" PRIx64 ".capnp", + f->c->persist.snap_path, f->c->persist.checkpoint_lsn); + + uint8_t* bytes2 = NULL; size_t len2 = 0; + TEST_ASSERT_EQUAL_INT(0, + snapent_read_checkpoint_config_bytes(path2, &bytes2, &len2)); + + TEST_ASSERT_EQUAL_size_t_MESSAGE(len1, len2, + "independent materializations at the same unchanged configuration " + "must yield equal-length config-bytes sections"); + TEST_ASSERT_EQUAL_MEMORY_MESSAGE(bytes1, bytes2, len1, + "independent materializations at the same unchanged configuration " + "must yield byte-identical config-bytes sections (Requirement 5.1)"); + TEST_ASSERT_EQUAL_size_t_MESSAGE(sizeof(SNAPENT_CONFIG_TEST_PAYLOAD) - 1, + len1, + "sanity: both materializations must actually carry the real config " + "content, not two empty sections trivially matching each other"); + + free(bytes1); + free(bytes2); + snapent_teardown(f); + printf("test_snapent_checkpoint_config_bytes_section_deterministic_across_checkpoints: PASS\n"); +} + /* ─────────────────────────────────────────────────────────────────────── * ha-entity-snapshots Task 4.2 (Req 3.1-3.3): rotation-guard RED test. * @@ -1046,6 +1790,13 @@ static void snapent_force_queue_status(cluster_t* c, const char* name, static void test_snapent_load_snapshot_restores_entities_before_advancing_position(void) { + /* Un-IGNORE'd by config-upgrade-snapshot task 4: load_snapshot_entities' + * queue decode is now migrated to the QueueAdminState capnp layout + * write_snapshot has written since task 2.2, so this real + * persist_checkpoint + persist_load_snapshot round trip (previously + * blocked -- see git history for the prior TEST_IGNORE_MESSAGE) now + * passes for real. */ + const int n_jobs = 3; const int m_queues = 2; @@ -1136,6 +1887,169 @@ static void test_snapent_load_snapshot_restores_entities_before_advancing_positi printf("test_snapent_load_snapshot_restores_entities_before_advancing_position: PASS\n"); } +/* ------------------------------------------------------------------ */ +/* Test (config-upgrade-snapshot task 4, Req 1.10): a checkpoint carrying */ +/* BOTH queue and host admin-state content, loaded via a REAL */ +/* persist_checkpoint + persist_load_snapshot round trip, must restore */ +/* every queue AND every host correctly -- regardless of restore order */ +/* between the two entity types (design.md "Referential integrity" / */ +/* Design Invariant 2: re-homing decisions are baked in at materialization */ +/* time, restore never re-derives them, so each entity type's restore is */ +/* independent of the other's). Exercises BOTH of restore_host_state's */ +/* branches (worker.c, task 3) through the real decode-and-dispatch path */ +/* this task adds: */ +/* - miss: a host with no local record on the destination must come */ +/* back as a valid create-if-missing placeholder carrying only */ +/* the restored admin bits (Requirement 1.10, 1.11). */ +/* - hit: a host the destination already knows about must have its */ +/* admin bits OR'd in, with its pre-existing dynamic/attrs */ +/* state left completely untouched (Requirement 1.7). */ +/* ------------------------------------------------------------------ */ + +static void test_snapent_load_snapshot_restores_hosts_and_queues_end_to_end(void) +{ + const int m_queues = 3; + const int n_hosts = 4; /* indices 0,1 pre-exist on dst (hit); 2,3 miss */ + + /* Source: produces the entity-bearing checkpoint (queues + hosts, both + * carrying real admin content plus, for hosts, dynamic bits that must + * NOT survive into the frame -- Requirement 1.7, already covered by + * collect_host_frames' own tests; re-seeded here only as realistic + * source state, not re-asserted). */ + snapent_fixture_t* src = snapent_make(0, m_queues); + TEST_ASSERT_NOT_NULL(src); + snapent_seed_hosts(src->c, n_hosts); + TEST_ASSERT_EQUAL_INT(0, persist_checkpoint(&src->c->persist)); + + uint64_t expected_lsn = src->c->persist.checkpoint_lsn; + char path[4096]; + snprintf(path, sizeof(path), "%s/snap-%016" PRIx64 ".capnp", + src->c->persist.snap_path, expected_lsn); + + /* Destination: queues pre-provisioned with a sentinel status (queues are + * config-provisioned -- restore_queue_state is update-only), mirroring + * the existing job/queue round-trip test above. Only hosts 0 and 1 are + * pre-seeded (the "hit" case); hosts 2 and 3 have no local record at + * all (the "miss"/placeholder case) -- exactly the "member that hasn't + * locally replayed this host's join record yet" scenario Requirement + * 1.10 exists for. */ + snapent_fixture_t* dst = snapent_make(0, m_queues); + TEST_ASSERT_NOT_NULL(dst); + for (int i = 0; i < m_queues; i++) { + char name[32]; + snapent_queue_name(i, name, sizeof(name)); + snapent_force_queue_status(dst->c, name, SNAPENT_PRE_RESTORE_QUEUE_STATUS); + } + + /* Pre-existing dynamic bit that must survive restore untouched (Req + * 1.7's flip side: restore must never CLEAR a real worker's existing + * non-admin state, only OR admin bits into it). XCE_WORKER_BUSY is the + * same dynamic bit SNAPENT_HOST_DYNAMIC_BITS already exercises above. */ + const uint32_t hit_pre_existing_dynamic_bit = XCE_WORKER_BUSY; + for (int i = 0; i < 2; i++) { + char name[32]; + snapent_host_name(i, name, sizeof(name)); + + hostattrs_t attrs; + memset(&attrs, 0, sizeof(attrs)); + xce_worker_t hdef; + memset(&hdef, 0, sizeof(hdef)); + hdef.name = name; + hdef.attrs = &attrs; + /* Deliberately NOT the checkpoint's real admin status -- a + * post-restore match can then only be explained by a genuine + * restore_host_state OR-in, not coincidental pre-existing state. */ + hdef.status = hit_pre_existing_dynamic_bit; + + TEST_ASSERT_NOT_NULL_MESSAGE(makeWorker(dst->c->workermgr, &hdef), + "destination hit-case host seeding must succeed"); + } + + /* Sanity: the miss-case hosts truly have no record on the destination + * yet. */ + for (int i = 2; i < n_hosts; i++) { + char name[32]; + snapent_host_name(i, name, sizeof(name)); + TEST_ASSERT_NULL(snapent_find_worker(dst->c, name)); + } + + bool entities_restored = false; + int rc = persist_load_snapshot(&dst->c->persist, path, expected_lsn, + &entities_restored); + + TEST_ASSERT_EQUAL_INT_MESSAGE(0, rc, + "loading a checkpoint carrying both queue and host admin-state " + "content must succeed"); + TEST_ASSERT_TRUE_MESSAGE(entities_restored, + "a checkpoint carrying queue/host entities must report " + "entities_restored=true"); + + /* Every queue's admin status restored -- proves the migrated capnp + * QueueAdminState decode still dispatches correctly to + * restore_queue_state alongside the new host section. */ + for (int i = 0; i < m_queues; i++) { + char name[32]; + snapent_queue_name(i, name, sizeof(name)); + + queue_t* q = snapent_find_queue(dst->c, name); + TEST_ASSERT_NOT_NULL(q); + TEST_ASSERT_EQUAL_UINT32_MESSAGE(snapent_queue_status(i), q->queue.status, + "queue restore must be unaffected by the new host section " + "decoding alongside it in the same checkpoint"); + } + + /* Hit-case hosts (0, 1): admin bits OR'd into the pre-existing worker; + * the pre-existing dynamic bit must survive untouched. */ + for (int i = 0; i < 2; i++) { + char name[32]; + snapent_host_name(i, name, sizeof(name)); + + worker_t* w = snapent_find_worker(dst->c, name); + TEST_ASSERT_NOT_NULL_MESSAGE(w, + "a host the destination already knew about must still be " + "present after restore (update, not replace)"); + TEST_ASSERT_EQUAL_UINT32_MESSAGE(snapent_host_admin_status(i), + w->host.status & SNAPENT_HOST_ADMIN_STATUS_MASK, + "restore must OR the checkpoint's admin bits into the " + "pre-existing worker's status"); + TEST_ASSERT_TRUE_MESSAGE( + (w->host.status & hit_pre_existing_dynamic_bit) != 0, + "restore must never clear a pre-existing worker's own " + "non-admin state (Requirement 1.7)"); + } + + /* Miss-case hosts (2, 3): a minimal, valid placeholder was created, + * carrying exactly the restored admin bits plus the UNAVAIL marker a + * not-yet-joined placeholder always gets -- never the source's dynamic + * bits, which were never part of the encoded frame to begin with. */ + for (int i = 2; i < n_hosts; i++) { + char name[32]; + snapent_host_name(i, name, sizeof(name)); + + worker_t* w = snapent_find_worker(dst->c, name); + TEST_ASSERT_NOT_NULL_MESSAGE(w, + "a host with no local record must get a create-if-missing " + "placeholder (Requirement 1.10), not be silently dropped"); + TEST_ASSERT_EQUAL_UINT32_MESSAGE(snapent_host_admin_status(i), + w->host.status & SNAPENT_HOST_ADMIN_STATUS_MASK, + "placeholder must carry exactly the restored admin bits"); + TEST_ASSERT_TRUE_MESSAGE((w->host.status & XCE_WORKER_UNAVAIL) != 0, + "a create-if-missing placeholder must be marked " + "unjoined/dead-until-connected"); + TEST_ASSERT_TRUE_MESSAGE((w->host.status & XCE_WORKER_BUSY) == 0, + "a dynamic/non-admin bit must never travel through the " + "checkpoint frame into a restored placeholder (Requirement 1.7)"); + TEST_ASSERT_NOT_NULL_MESSAGE(w->host.attrs, + "a placeholder's hostattrs_t must be non-NULL so a later real " + "join's rejoin_worker direct dereference does not crash " + "(Requirement 1.11)"); + } + + snapent_teardown(dst); + snapent_teardown(src); + printf("test_snapent_load_snapshot_restores_hosts_and_queues_end_to_end: PASS\n"); +} + /* ------------------------------------------------------------------ */ /* Test 8 (task 5.1, RED): a deliberately corrupted entity frame must fail */ /* the load and leave current_lsn/checkpoint_lsn COMPLETELY unchanged -- */ @@ -1306,8 +2220,15 @@ void test_persist_snapshot_entities(void) RUN_TEST(test_snapent_checkpoint_write_failure_leaves_no_final_file); RUN_TEST(test_snapent_checkpoint_mid_encode_failure_discards_whole_file); RUN_TEST(test_snapent_checkpoint_queue_status_roundtrip); + RUN_TEST(test_snapent_checkpoint_host_admin_status_roundtrip); + RUN_TEST(test_snapent_checkpoint_closed_host_yields_exactly_one_admin_only_frame); + RUN_TEST(test_snapent_checkpoint_no_hosts_yields_empty_host_section); + RUN_TEST(test_snapent_checkpoint_config_bytes_section_matches_source_file); + RUN_TEST(test_snapent_checkpoint_config_bytes_section_empty_when_no_local_config); + RUN_TEST(test_snapent_checkpoint_config_bytes_section_deterministic_across_checkpoints); RUN_TEST(test_snapent_rotation_preserves_in_flight_checkpoint); RUN_TEST(test_snapent_load_snapshot_restores_entities_before_advancing_position); + RUN_TEST(test_snapent_load_snapshot_restores_hosts_and_queues_end_to_end); RUN_TEST(test_snapent_load_snapshot_corrupted_entity_leaves_position_unchanged); RUN_TEST(test_snapent_load_snapshot_legacy_file_reports_position_only); } diff --git a/src/controller/testsuite/test_repl_unit.c b/src/controller/testsuite/test_repl_unit.c index 0daff18..7659777 100644 --- a/src/controller/testsuite/test_repl_unit.c +++ b/src/controller/testsuite/test_repl_unit.c @@ -583,6 +583,134 @@ static void test_repl_registration_lifecycle(void) { printf("test_repl_registration_lifecycle: PASS\n"); } +/* ============================================================ + * bug-1474: repl_add_standby slot allocation must never clobber an + * unexpired bug-1147 disconnect guard (last_disconnected_lsn) belonging to + * a DIFFERENT, still-disconnected peer, when a genuinely virgin + * (never-used) slot is available. See .wolf/buglog.json bug-1474 for the + * full forensic trace: a spurious/duplicate reconnect for an unrelated, + * already-connected peer picked the lower-indexed, guard-holding slot over + * a higher-indexed virgin slot and memset it to zero, silently destroying + * the guard repl_trim_lsn relies on to protect WAL segments a genuinely + * disconnected-but-reconnecting standby still needs. + * ============================================================ */ + +/* RED (pre-fix): repl_add_standby's old "first empty slot by lowest index" + * scan picks idx_a (guard-holding, index 0) over the virgin slot (index 2) + * purely because of index order, destroying A's guard. Req: the guard must + * survive and the new peer must land in the virgin slot instead. */ +static void test_repl_add_standby_prefers_virgin_slot_over_guard(void) { + replicator_t r; + int ep_a = 0, ep_b = 1, ep_c = 2; + repl_init(&r); + + int idx_a = repl_add_standby(&r, (void *)&ep_a, "standby-a", 7001); + int idx_b = repl_add_standby(&r, (void *)&ep_b, "standby-b", 7002); + TEST_ASSERT_TRUE(idx_a >= 0); + TEST_ASSERT_TRUE(idx_b >= 0); + TEST_ASSERT_NOT_EQUAL(idx_a, idx_b); + + /* A acks up to LSN 42, then disconnects: leaves a bug-1147 guard at + * idx_a with last_disconnected_lsn == 42. The third slot (whichever + * index neither idx_a nor idx_b used) remains genuinely virgin. */ + repl_on_ack(&r, (void *)&ep_a, 42); + repl_remove_standby(&r, (void *)&ep_a); + TEST_ASSERT_NULL(r.standbys[idx_a].ep); + TEST_ASSERT_EQUAL_UINT64(42, r.standbys[idx_a].last_disconnected_lsn); + + /* A third, genuinely NEW peer (unrelated to A) connects while idx_a's + * guard is still unexpired and a virgin slot is also available. */ + int idx_c = repl_add_standby(&r, (void *)&ep_c, "standby-c", 7003); + TEST_ASSERT_TRUE(idx_c >= 0); + + /* The new peer must land in the virgin slot, NOT the guard-holding one, + * even though idx_a may be the lower index. */ + TEST_ASSERT_NOT_EQUAL_MESSAGE(idx_a, idx_c, + "new peer must not be allocated the guard-holding slot when a" + " virgin slot exists (bug-1474)"); + + /* Load-bearing assertion: A's guard must survive completely untouched. + * Before the fix, repl_add_standby's unconditional memset(s, 0, ...) + * on the chosen slot would have wiped last_disconnected_lsn to 0 here. */ + TEST_ASSERT_NULL_MESSAGE(r.standbys[idx_a].ep, + "guard-holding slot must remain disconnected (bug-1474)"); + TEST_ASSERT_EQUAL_UINT64_MESSAGE(42, r.standbys[idx_a].last_disconnected_lsn, + "bug-1147 guard LSN must survive an unrelated peer's" + " repl_add_standby call (bug-1474)"); + + repl_fini(&r); + printf("test_repl_add_standby_prefers_virgin_slot_over_guard: PASS\n"); +} + +/* RED (pre-fix, and proves the DELIBERATE fallback policy): with + * MAX_STANDBYS==3, exhaust all three slots, then disconnect two of them + * (both now guard-holding, one older-disconnected than the other) so NO + * virgin slot remains. A fourth genuinely new peer must still be admitted + * (never -ENOSPC for this case -- refusing a legitimate reconnect would be + * worse for cluster availability than an early guard loss), and the + * fallback must deterministically reuse the OLDER-disconnected guard slot + * (closest to its own natural repl_expire_disconnect_slots expiry, so + * reusing it discards the LEAST remaining WAL-retention protection) -- + * not merely the lowest-indexed guard slot. */ +static void test_repl_add_standby_exhausted_guards_prefers_oldest_disconnect(void) { + replicator_t r; + int ep_a = 0, ep_b = 1, ep_c = 2, ep_d = 3; + repl_init(&r); + + int idx_a = repl_add_standby(&r, (void *)&ep_a, "standby-a", 7001); + int idx_b = repl_add_standby(&r, (void *)&ep_b, "standby-b", 7002); + int idx_c = repl_add_standby(&r, (void *)&ep_c, "standby-c", 7003); + TEST_ASSERT_TRUE(idx_a >= 0); + TEST_ASSERT_TRUE(idx_b >= 0); + TEST_ASSERT_TRUE(idx_c >= 0); + /* All MAX_STANDBYS(3) slots now occupied. */ + + /* B disconnects first; force its disconnect timestamp strictly OLDER + * than A's (below) so the two guards are unambiguously ordered by + * time, independent of their slot index (idx_a < idx_b by add order -- + * deliberately the OPPOSITE of the time order, so a naive + * "lowest-index guard slot" fallback would pick the wrong one). */ + repl_on_ack(&r, (void *)&ep_b, 20); + repl_remove_standby(&r, (void *)&ep_b); + r.standbys[idx_b].last_disconnect_time -= 100; + + /* A disconnects second, with its real (newer) "now" timestamp. */ + repl_on_ack(&r, (void *)&ep_a, 10); + repl_remove_standby(&r, (void *)&ep_a); + + TEST_ASSERT_TRUE_MESSAGE( + r.standbys[idx_b].last_disconnect_time < r.standbys[idx_a].last_disconnect_time, + "test setup invariant: B must be the OLDER disconnect"); + + /* C is still connected; nstandbys == 1 (< MAX_STANDBYS), so the + * "too many distinct live peers" -ENOSPC guard does not trip -- but + * BOTH empty slots (idx_a, idx_b) are guard-holding: no virgin slot + * exists anywhere in the registry. */ + TEST_ASSERT_EQUAL_INT(1, r.nstandbys); + + /* A fourth, genuinely new peer connects into the exhausted state. */ + int idx_d = repl_add_standby(&r, (void *)&ep_d, "standby-d", 7004); + TEST_ASSERT_TRUE_MESSAGE(idx_d >= 0, + "exhausted-guard fallback must still admit a legitimate new peer," + " never -ENOSPC (bug-1474 policy)"); + + /* Deliberate policy: reuse the OLDER-disconnected guard slot (idx_b), + * not idx_a (which is both newer-disconnected AND lower-indexed -- + * ruling out an accidental "first guard by index" fallthrough). */ + TEST_ASSERT_EQUAL_INT_MESSAGE(idx_b, idx_d, + "exhausted fallback must reuse the OLDEST-disconnected guard slot," + " not merely the lowest-indexed one (bug-1474 policy)"); + + /* idx_a's guard (the one NOT chosen) must remain completely untouched. */ + TEST_ASSERT_NULL_MESSAGE(r.standbys[idx_a].ep, + "non-selected guard slot must remain disconnected"); + TEST_ASSERT_EQUAL_UINT64_MESSAGE(10, r.standbys[idx_a].last_disconnected_lsn, + "non-selected guard slot's LSN must survive untouched"); + + repl_fini(&r); + printf("test_repl_add_standby_exhausted_guards_prefers_oldest_disconnect: PASS\n"); +} + void test_repl_unit(void) { UnitySetTestFile(__FILE__); RUN_TEST(test_repl_init_zeroes_nstandbys); @@ -608,4 +736,7 @@ void test_repl_unit(void) { RUN_TEST(test_wal_nack_does_not_update_acked_lsn); /* Task 5.3: registration lifecycle — Req 1.1, 1.2, 1.3 */ RUN_TEST(test_repl_registration_lifecycle); + /* bug-1474: slot allocation must not clobber an unexpired guard */ + RUN_TEST(test_repl_add_standby_prefers_virgin_slot_over_guard); + RUN_TEST(test_repl_add_standby_exhausted_guards_prefers_oldest_disconnect); } diff --git a/src/controller/testsuite/test_snapverify.c b/src/controller/testsuite/test_snapverify.c index 73b66ad..84651ae 100644 --- a/src/controller/testsuite/test_snapverify.c +++ b/src/controller/testsuite/test_snapverify.c @@ -26,15 +26,41 @@ static void cleanup_dir(void) } /* Writes a checkpoint file matching persist.c write_snapshot()'s exact - * on-disk layout (magic+lsn+cfgref(41, all-zero/absent) + fmt + job_count + - * per-job[len+buf] + queue_count + per-queue[namelen+name+status]). - * job_lens/job_count and queue_names/queue_count are caller-controlled so - * tests can inject a specific defect. `truncate_last_bytes` drops that many - * bytes off the END of the fully-written file (0 = write it whole). */ -static void write_snap(const char* path, uint64_t lsn, uint32_t fmt, - const uint32_t* job_lens, uint32_t job_count, - const char** queue_names, const uint32_t* queue_status, - uint32_t queue_count, int truncate_last_bytes) + * on-disk layout for SNAPSHOT_FORMAT_VERSION=2 (magic+lsn+cfgref(41) + fmt + + * job_count + per-job[payload_len+buf] + queue_count + per-queue + * [payload_len+opaque_bytes] + host_count + per-host[payload_len+buf] + + * cfg_bytes_len + cfg_bytes). + * + * Queue/host frame CONTENT is irrelevant here -- snapverify validates + * structure only (length-prefix walk), never capnp-decodes a payload -- so + * queue frames are written as an opaque [payload_len][name_len+name+status] + * blob (convenient filler reusing the queue_names/queue_status test + * parameters, NOT a real capnp QueueAdminState encoding) and host frames as + * an opaque [payload_len][0xCD-filled bytes] blob. + * + * job_lens/job_count, queue_names/queue_status/queue_count, and + * host_lens/host_count are all caller-controlled so tests can inject a + * specific defect or size at a specific section. cfg_bytes_len controls the + * trailing config-bytes section's declared length (content is 0xEF filler); + * pass 0 for "section present but empty" -- the section's 4-byte length + * field is ALWAYS written by this helper (mirrors persist.c writing it on + * every checkpoint, even when there are no local config bytes yet). Tests + * that need to inject a real header cfgref, or a file with NO config-bytes + * length field at all, use write_snap_full()/a hand-written file instead + * (see below). + * + * `truncate_last_bytes` drops that many bytes off the END of the fully- + * written file (0 = write it whole). */ +static void write_snap_full(const char* path, uint64_t lsn, + int cfgref_present, uint64_t cfgref_tag, + const uint8_t* cfgref_sha /* 32 bytes, or NULL + * for all-zero */, + uint32_t fmt, + const uint32_t* job_lens, uint32_t job_count, + const char** queue_names, + const uint32_t* queue_status, uint32_t queue_count, + const uint32_t* host_lens, uint32_t host_count, + uint32_t cfg_bytes_len, int truncate_last_bytes) { FILE* fp = fopen(path, "wb"); TEST_ASSERT_NOT_NULL(fp); @@ -43,6 +69,10 @@ static void write_snap(const char* path, uint64_t lsn, uint32_t fmt, memset(header, 0, sizeof(header)); memcpy(header, "XCESNAP\0", 8); memcpy(header + 8, &lsn, 8); + header[16] = (char)(cfgref_present ? 1 : 0); + memcpy(header + 17, &cfgref_tag, 8); + if (cfgref_sha) + memcpy(header + 25, cfgref_sha, 32); fwrite(header, 1, sizeof(header), fp); fwrite(&fmt, sizeof(fmt), 1, fp); @@ -57,11 +87,31 @@ static void write_snap(const char* path, uint64_t lsn, uint32_t fmt, fwrite(&queue_count, sizeof(queue_count), 1, fp); for (uint32_t i = 0; i < queue_count; i++) { - uint32_t nlen = (uint32_t)strlen(queue_names[i]); + uint32_t nlen = (uint32_t)strlen(queue_names[i]); + uint32_t payload_len = (uint32_t)(sizeof(nlen) + nlen + + sizeof(queue_status[i])); + fwrite(&payload_len, sizeof(payload_len), 1, fp); fwrite(&nlen, sizeof(nlen), 1, fp); fwrite(queue_names[i], 1, nlen, fp); fwrite(&queue_status[i], sizeof(queue_status[i]), 1, fp); } + + fwrite(&host_count, sizeof(host_count), 1, fp); + for (uint32_t i = 0; i < host_count; i++) { + fwrite(&host_lens[i], sizeof(host_lens[i]), 1, fp); + uint8_t* buf = malloc(host_lens[i]); + memset(buf, 0xCD, host_lens[i]); + fwrite(buf, 1, host_lens[i], fp); + free(buf); + } + + fwrite(&cfg_bytes_len, sizeof(cfg_bytes_len), 1, fp); + if (cfg_bytes_len > 0) { + uint8_t* buf = malloc(cfg_bytes_len); + memset(buf, 0xEF, cfg_bytes_len); + fwrite(buf, 1, cfg_bytes_len, fp); + free(buf); + } fclose(fp); if (truncate_last_bytes > 0) { @@ -74,6 +124,21 @@ static void write_snap(const char* path, uint64_t lsn, uint32_t fmt, } } +/* Convenience wrapper for the (common) case of no header cfgref -- mirrors + * every pre-task-8.4 call site's shape, just with the new host_lens/ + * host_count/cfg_bytes_len parameters appended. */ +static void write_snap(const char* path, uint64_t lsn, uint32_t fmt, + const uint32_t* job_lens, uint32_t job_count, + const char** queue_names, const uint32_t* queue_status, + uint32_t queue_count, + const uint32_t* host_lens, uint32_t host_count, + uint32_t cfg_bytes_len, int truncate_last_bytes) +{ + write_snap_full(path, lsn, 0, 0, NULL, fmt, job_lens, job_count, + queue_names, queue_status, queue_count, host_lens, + host_count, cfg_bytes_len, truncate_last_bytes); +} + static void test_legacy_position_only_file_is_ok(void) { fresh_dir(); @@ -104,21 +169,29 @@ static void test_entity_bearing_well_formed_file_is_ok(void) char path[512]; snprintf(path, sizeof(path), "%s/snap-0000000000000064.capnp", g_dir); - uint32_t job_lens[3] = { 100, 200, 50 }; + uint32_t job_lens[3] = { 100, 200, 50 }; const char* qnames[2] = { "gpu", "cpu" }; - uint32_t qstatus[2] = { 1, 0 }; - write_snap(path, 100, 1, job_lens, 3, qnames, qstatus, 2, 0); + uint32_t qstatus[2] = { 1, 0 }; + /* fmt=2 (SNAPSHOT_FORMAT_VERSION), no hosts, cfg-bytes section present + * but empty -- must still be fully consumed to EOF by the fmt-2-aware + * parser (task 8.4 fix: this file shape is what a real checkpoint + * written by the current codebase looks like). */ + write_snap(path, 100, 2, job_lens, 3, qnames, qstatus, 2, NULL, 0, 0, 0); snapverify_report_t rep; int rc = snapverify_path(path, stdout, &rep); TEST_ASSERT_EQUAL_INT(0, rc); TEST_ASSERT_EQUAL_INT(1, rep.ok); TEST_ASSERT_EQUAL_INT(1, rep.has_entity_section); - TEST_ASSERT_EQUAL_UINT32(1, rep.format_version); + TEST_ASSERT_EQUAL_UINT32(2, rep.format_version); TEST_ASSERT_EQUAL_UINT32(3, rep.job_count); TEST_ASSERT_EQUAL_UINT32(3, rep.jobs_ok); TEST_ASSERT_EQUAL_UINT32(2, rep.queue_count); TEST_ASSERT_EQUAL_UINT32(2, rep.queues_ok); + TEST_ASSERT_EQUAL_UINT32(0, rep.host_count); + TEST_ASSERT_EQUAL_UINT32(0, rep.hosts_ok); + TEST_ASSERT_EQUAL_INT(1, rep.has_config_bytes_section); + TEST_ASSERT_EQUAL_UINT32(0, rep.config_bytes_len); TEST_ASSERT_EQUAL_INT(-1, (int)rep.fail_offset); cleanup_dir(); } @@ -165,7 +238,8 @@ static void test_unrecognized_format_version_is_einval(void) char path[512]; snprintf(path, sizeof(path), "%s/snap-0000000000000001.capnp", g_dir); uint32_t job_lens[1] = { 10 }; - write_snap(path, 1, 99 /* bogus version */, job_lens, 1, NULL, NULL, 0, 0); + write_snap(path, 1, 99 /* bogus version */, job_lens, 1, NULL, NULL, 0, + NULL, 0, 0, 0); snapverify_report_t rep; int rc = snapverify_path(path, stdout, &rep); @@ -187,7 +261,7 @@ static void test_corrupt_job_payload_len_reports_exact_failure_point(void) snprintf(path, sizeof(path), "%s/snap-0000000000000002.capnp", g_dir); uint32_t job_lens[4] = { 50, 60, 70, 80 }; - write_snap(path, 2, 1, job_lens, 4, NULL, NULL, 0, 0); + write_snap(path, 2, 2, job_lens, 4, NULL, NULL, 0, NULL, 0, 0, 0); /* Corrupt job 2's length field (3rd job, after header(57)+fmt(4)+ * job_count(4)+job0(4+50)+job1(4+60) = 57+4+4+54+64 = 183) to a value @@ -217,6 +291,166 @@ static void test_missing_path_errors(void) TEST_ASSERT_LESS_THAN_INT(0, rc); } +/* task 8.4: the header's cfgref tag/sha must be DECODED (not merely + * reported present) -- a genuine round-trip assertion against concrete + * injected values, not just "non-zero". */ +static void test_cfgref_tag_and_sha_decode_roundtrip(void) +{ + fresh_dir(); + char path[512]; + snprintf(path, sizeof(path), "%s/snap-00000000000000c8.capnp", g_dir); + + uint64_t tag = 0x1122334455667788ULL; + uint8_t sha[32]; + memset(sha, 0xAA, 16); + memset(sha + 16, 0xBB, 16); + + write_snap_full(path, 200, 1 /* cfgref_present */, tag, sha, 2, NULL, 0, + NULL, NULL, 0, NULL, 0, 0, 0); + + snapverify_report_t rep; + int rc = snapverify_path(path, stdout, &rep); + TEST_ASSERT_EQUAL_INT(0, rc); + TEST_ASSERT_EQUAL_INT(1, rep.ok); + TEST_ASSERT_EQUAL_INT(1, rep.has_cfgref); + TEST_ASSERT_EQUAL_UINT64(tag, rep.cfgref_tag); + TEST_ASSERT_EQUAL_MEMORY(sha, rep.cfgref_sha, 32); + cleanup_dir(); +} + +/* task 8.4: host frames get their own structural walk + counts, same shape + * as the job/queue loops. */ +static void test_host_frames_are_walked_and_counted(void) +{ + fresh_dir(); + char path[512]; + snprintf(path, sizeof(path), "%s/snap-00000000000000c9.capnp", g_dir); + + uint32_t host_lens[3] = { 30, 45, 12 }; + write_snap(path, 201, 2, NULL, 0, NULL, NULL, 0, host_lens, 3, 0, 0); + + snapverify_report_t rep; + int rc = snapverify_path(path, stdout, &rep); + TEST_ASSERT_EQUAL_INT(0, rc); + TEST_ASSERT_EQUAL_INT(1, rep.ok); + TEST_ASSERT_EQUAL_UINT32(3, rep.host_count); + TEST_ASSERT_EQUAL_UINT32(3, rep.hosts_ok); + cleanup_dir(); +} + +/* task 8.4: a non-empty trailing config-bytes section is reported with its + * concrete declared length. */ +static void test_nonempty_config_bytes_section_is_reported(void) +{ + fresh_dir(); + char path[512]; + snprintf(path, sizeof(path), "%s/snap-00000000000000ca.capnp", g_dir); + + write_snap(path, 202, 2, NULL, 0, NULL, NULL, 0, NULL, 0, 42, 0); + + snapverify_report_t rep; + int rc = snapverify_path(path, stdout, &rep); + TEST_ASSERT_EQUAL_INT(0, rc); + TEST_ASSERT_EQUAL_INT(1, rep.ok); + TEST_ASSERT_EQUAL_INT(1, rep.has_config_bytes_section); + TEST_ASSERT_EQUAL_UINT32(42, rep.config_bytes_len); + cleanup_dir(); +} + +/* task 8.4: an EXPLICIT zero-length config-bytes section (the 4-byte length + * field IS present and reads 0, immediately followed by EOF) must be + * distinguishable from a file that has no config-bytes section at all -- + * both are ok==1, but only the explicit-zero case has + * has_config_bytes_section==1. */ +static void test_explicit_zero_length_config_bytes_section_is_ok(void) +{ + fresh_dir(); + char path[512]; + snprintf(path, sizeof(path), "%s/snap-00000000000000cb.capnp", g_dir); + + write_snap(path, 203, 2, NULL, 0, NULL, NULL, 0, NULL, 0, 0, 0); + + snapverify_report_t rep; + int rc = snapverify_path(path, stdout, &rep); + TEST_ASSERT_EQUAL_INT(0, rc); + TEST_ASSERT_EQUAL_INT(1, rep.ok); + TEST_ASSERT_EQUAL_INT(1, rep.has_config_bytes_section); + TEST_ASSERT_EQUAL_UINT32(0, rep.config_bytes_len); + cleanup_dir(); +} + +/* task 8.4: a file that simply ENDS right after the host section (no + * config_bytes_len field at all -- a slightly-older-but-still-fmt-2- + * consistent shape) is still ok==1, but has_config_bytes_section==0 -- + * the counterpart to the explicit-zero-length case above, proving the two + * are genuinely distinguishable rather than collapsed into one "empty" + * bucket. Hand-written (not via write_snap_full, which always writes the + * length field) to produce exactly this shape. */ +static void test_no_config_bytes_section_at_all_is_still_ok(void) +{ + fresh_dir(); + char path[512]; + snprintf(path, sizeof(path), "%s/snap-00000000000000cc.capnp", g_dir); + + FILE* fp = fopen(path, "wb"); + TEST_ASSERT_NOT_NULL(fp); + + char header[16 + 1 + 8 + 32]; + memset(header, 0, sizeof(header)); + memcpy(header, "XCESNAP\0", 8); + uint64_t lsn = 204; + memcpy(header + 8, &lsn, 8); + fwrite(header, 1, sizeof(header), fp); + + uint32_t fmt = 2; + uint32_t zero = 0; + fwrite(&fmt, sizeof(fmt), 1, fp); /* format_version */ + fwrite(&zero, sizeof(zero), 1, fp); /* job_count = 0 */ + fwrite(&zero, sizeof(zero), 1, fp); /* queue_count = 0 */ + fwrite(&zero, sizeof(zero), 1, fp); /* host_count = 0 */ + /* No config_bytes_len field at all -- file ends right here. */ + fclose(fp); + + snapverify_report_t rep; + int rc = snapverify_path(path, stdout, &rep); + TEST_ASSERT_EQUAL_INT(0, rc); + TEST_ASSERT_EQUAL_INT(1, rep.ok); + TEST_ASSERT_EQUAL_INT(0, rep.has_config_bytes_section); + cleanup_dir(); +} + +/* task 8.4: same corrupt-length-field diagnostic as + * test_corrupt_job_payload_len_reports_exact_failure_point, in the host + * section instead of the job section. */ +static void test_corrupt_host_payload_len_reports_exact_failure_point(void) +{ + fresh_dir(); + char path[512]; + snprintf(path, sizeof(path), "%s/snap-00000000000000cd.capnp", g_dir); + + uint32_t host_lens[3] = { 20, 30, 40 }; + write_snap(path, 205, 2, NULL, 0, NULL, NULL, 0, host_lens, 3, 0, 0); + + /* header(57) + fmt(4) + job_count(4) + [0 jobs] + queue_count(4) + + * [0 queues] + host_count(4) + host0(4+20) + host1(4+30) = offset of + * host2's payload_len field. */ + long host2_len_off = 57 + 4 + 4 + 4 + 4 + (4 + 20) + (4 + 30); + FILE* fp = fopen(path, "r+b"); + TEST_ASSERT_NOT_NULL(fp); + fseek(fp, host2_len_off, SEEK_SET); + uint32_t garbage = 0x7FFFFFFF; + fwrite(&garbage, sizeof(garbage), 1, fp); + fclose(fp); + + snapverify_report_t rep; + int rc = snapverify_path(path, stdout, &rep); + TEST_ASSERT_EQUAL_INT(-EIO, rc); + TEST_ASSERT_EQUAL_INT(0, rep.ok); + TEST_ASSERT_EQUAL_UINT32(2, rep.hosts_ok); /* host 0, host 1 parsed fine */ + TEST_ASSERT_EQUAL_INT(host2_len_off, (int)rep.fail_offset); + cleanup_dir(); +} + void test_snapverify(void) { UnitySetTestFile(__FILE__); @@ -227,4 +461,10 @@ void test_snapverify(void) RUN_TEST(test_unrecognized_format_version_is_einval); RUN_TEST(test_corrupt_job_payload_len_reports_exact_failure_point); RUN_TEST(test_missing_path_errors); + RUN_TEST(test_cfgref_tag_and_sha_decode_roundtrip); + RUN_TEST(test_host_frames_are_walked_and_counted); + RUN_TEST(test_nonempty_config_bytes_section_is_reported); + RUN_TEST(test_explicit_zero_length_config_bytes_section_is_ok); + RUN_TEST(test_no_config_bytes_section_at_all_is_still_ok); + RUN_TEST(test_corrupt_host_payload_len_reports_exact_failure_point); } diff --git a/src/controller/testsuite/test_term_safety_adapter.c b/src/controller/testsuite/test_term_safety_adapter.c index 2826458..d241218 100644 --- a/src/controller/testsuite/test_term_safety_adapter.c +++ b/src/controller/testsuite/test_term_safety_adapter.c @@ -1983,6 +1983,181 @@ static void test_repl_ack_out_of_range_peer_rejected(void) printf("test_repl_ack_out_of_range_peer_rejected: PASS\n"); } +/* ================================================================== */ +/* bug-1479 — drive the library on a REJECTED AppendEntries (WAL NACK) */ +/* ================================================================== */ + +/* Before this fix, a WAL NACK (WalAckReply.success == 0) for an ordinary + * Raft log conflict (ae_reject_logmismatch) was silently dropped after + * stale-term discovery -- the library's own, already-correct nextIndex + * backoff (raft_on_append_entries_reply's failure branch, raft.tla 401) was + * never invoked, so a standby stuck in log conflict never had its resend + * position corrected: the primary kept broadcasting new entries assuming + * agreement at an index the standby had already rejected, forever, until + * MAX_PENDING_ACKS silently evicted it into catch-up -- at which point + * NOTHING streamed it back into sync either (the ACK-driven continuation + * needs a real ACK to fire, which a log-conflicted standby can never send). + * + * ha_raft_on_repl_nack mirrors ha_raft_on_repl_ack's bounds-checked + * peer-index resolution, but routes success=0 into the library (backing + * off next_index[peer] by one, per raft.c's documented failure branch) and + * returns the corrected resume LSN instead of trying to advance commit. */ + +/* (a) A rejection backs off next_index[peer] by exactly one and returns the + * corrected LSN (next_index - 1) -- the position the standby is now + * believed caught up through. */ +static void test_repl_nack_backs_off_next_index_and_returns_corrected_lsn(void) +{ + char tmp[256]; + strcpy(tmp, "/tmp/xce_ts_nack_backoff_XXXXXX"); + TEST_ASSERT_NOT_NULL(mkdtemp(tmp)); + + const uint64_t T = 6; + + cluster_t* c = make_cluster(tmp); + TEST_ASSERT_NOT_NULL(c); + make_leader(c, T, /*n_peers*/3); + leader_seed_entries(c, T, /*count*/5); + + /* make_leader pokes role=RAFT_LEADER directly without going through the + * library's real BecomeLeader transition (raft_init_leader_progress, + * raft.c:97-103), so next_index[] stays 0 for every peer regardless of + * log_len. Seed it here to what a genuine BecomeLeader would have set + * (log_len + 1), so this test exercises a realistic starting position. */ + c->ha.raft.next_index[1] = c->ha.raft.log_len + 1; + TEST_ASSERT_EQUAL_UINT64(6, c->ha.raft.next_index[1]); + + uint64_t corrected_lsn = 999; /* sentinel -- must be overwritten */ + int rc = ha_raft_on_repl_nack(c, /*abs_peer_idx*/1, /*reply_term*/T, + &corrected_lsn); + TEST_ASSERT_EQUAL_INT(0, rc); + + /* next_index backed off by exactly one (raft.c: Max(next_index-1, 1)). */ + TEST_ASSERT_EQUAL_UINT64(5, c->ha.raft.next_index[1]); + /* Corrected resume point is next_index - 1. */ + TEST_ASSERT_EQUAL_UINT64(4, corrected_lsn); + /* A rejection never advances commit. */ + TEST_ASSERT_EQUAL_UINT64(0, c->ha.raft.commit_index); + + teardown_cluster(c); + printf("test_repl_nack_backs_off_next_index_and_returns_corrected_lsn: PASS\n"); +} + +/* (b) Repeated rejections keep backing off, floored at 1 -- never underflows + * (raft.c's Max(next_index-1, 1), matching raft.tla exactly). */ +static void test_repl_nack_repeated_rejections_floor_at_one(void) +{ + char tmp[256]; + strcpy(tmp, "/tmp/xce_ts_nack_floor_XXXXXX"); + TEST_ASSERT_NOT_NULL(mkdtemp(tmp)); + + const uint64_t T = 6; + + cluster_t* c = make_cluster(tmp); + TEST_ASSERT_NOT_NULL(c); + make_leader(c, T, /*n_peers*/3); + leader_seed_entries(c, T, /*count*/2); + + /* Seed next_index[1] to what a real BecomeLeader would set (log_len+1 = + * 3) -- make_leader itself leaves it at 0 (see the backoff test above). + * Reject enough times to walk it down to 1 and confirm it never goes + * below. */ + c->ha.raft.next_index[1] = c->ha.raft.log_len + 1; + uint64_t corrected_lsn = 0; + for (int i = 0; i < 5; i++) { + TEST_ASSERT_EQUAL_INT(0, + ha_raft_on_repl_nack(c, /*abs_peer_idx*/1, /*reply_term*/T, + &corrected_lsn)); + } + TEST_ASSERT_EQUAL_UINT64(1, c->ha.raft.next_index[1]); + TEST_ASSERT_EQUAL_UINT64(0, corrected_lsn); + + teardown_cluster(c); + printf("test_repl_nack_repeated_rejections_floor_at_one: PASS\n"); +} + +/* (c) Defense-in-depth: same out-of-range/self rejection as the ACK seam -- + * no library accounting on a bogus peer index. */ +static void test_repl_nack_out_of_range_peer_rejected(void) +{ + char tmp[256]; + strcpy(tmp, "/tmp/xce_ts_nack_oob_XXXXXX"); + TEST_ASSERT_NOT_NULL(mkdtemp(tmp)); + + const uint64_t T = 6; + + cluster_t* c = make_cluster(tmp); + TEST_ASSERT_NOT_NULL(c); + make_leader(c, T, /*n_peers*/3); + leader_seed_entries(c, T, /*count*/2); + + /* Seed next_index[1] as a real BecomeLeader would (log_len+1 = 3); see + * the backoff test above for why make_leader itself leaves it at 0. */ + c->ha.raft.next_index[1] = c->ha.raft.log_len + 1; + + uint64_t corrected_lsn = 0; + TEST_ASSERT_EQUAL_INT(-EINVAL, + ha_raft_on_repl_nack(c, /*abs_peer_idx*/3, /*reply_term*/T, &corrected_lsn)); + TEST_ASSERT_EQUAL_INT(-EINVAL, + ha_raft_on_repl_nack(c, /*abs_peer_idx*/0, /*reply_term*/T, &corrected_lsn)); + + /* next_index untouched by either rejected call. */ + TEST_ASSERT_EQUAL_UINT64(3, c->ha.raft.next_index[1]); + + teardown_cluster(c); + printf("test_repl_nack_out_of_range_peer_rejected: PASS\n"); +} + +/* (d) THE CORE REGRESSION: composing ha_raft_on_repl_nack + repl_start_catchup + * -- exactly what repl_ack_decode_and_dispatch's NACK branch now does -- + * marks the standby in_catch_up at the CORRECTED position on the very FIRST + * rejection. Before this fix, nothing marked it at all until repl_broadcast's + * own MAX_PENDING_ACKS=16 eviction fired (silently, using the standby's last + * ACKED lsn rather than a library-backed-off position) -- and even then, + * nothing would ever stream to it (the ACK-driven continuation requires a + * real ACK a log-conflicted standby can never send). This test proves the + * immediate half of the fix: no 16-strike wait, and the resume point comes + * from the library's own nextIndex backoff, not a guess. */ +static void test_nack_immediately_marks_catchup_at_corrected_lsn_not_after_16_strikes(void) +{ + char tmp[256]; + strcpy(tmp, "/tmp/xce_ts_nack_catchup_XXXXXX"); + TEST_ASSERT_NOT_NULL(mkdtemp(tmp)); + + const uint64_t T = 6; + + cluster_t* c = make_cluster(tmp); + TEST_ASSERT_NOT_NULL(c); + make_leader(c, T, /*n_peers*/3); + leader_seed_entries(c, T, /*count*/5); + + TEST_ASSERT_EQUAL_INT(0, + repl_add_standby(&c->persist.repl, &g_ae_dummy_ep, "sb0", 7000)); + + uint64_t join_lsn_before; + TEST_ASSERT_EQUAL_INT_MESSAGE(0, + repl_get_catchup_join_lsn(&c->persist.repl, &g_ae_dummy_ep, &join_lsn_before), + "a freshly-added standby must not already be in catch-up"); + + /* THE FIRST rejection -- not the 16th. */ + uint64_t corrected_lsn = 999; + TEST_ASSERT_EQUAL_INT(0, + ha_raft_on_repl_nack(c, /*abs_peer_idx*/1, /*reply_term*/T, &corrected_lsn)); + repl_start_catchup(&c->persist.repl, &g_ae_dummy_ep, corrected_lsn); + + uint64_t join_lsn_after; + TEST_ASSERT_EQUAL_INT_MESSAGE(1, + repl_get_catchup_join_lsn(&c->persist.repl, &g_ae_dummy_ep, &join_lsn_after), + "a single rejection must immediately mark the standby in catch-up " + "(bug-1479 -- no 16-strike wait)"); + TEST_ASSERT_EQUAL_UINT64_MESSAGE(corrected_lsn, join_lsn_after, + "the catch-up resume point must be the library's backed-off " + "next_index - 1, not a guess"); + + teardown_cluster(c); + printf("test_nack_immediately_marks_catchup_at_corrected_lsn_not_after_16_strikes: PASS\n"); +} + /* ================================================================== */ /* Task 5.1 — every-callback + marker-path end-to-end integration */ /* ================================================================== */ @@ -2209,6 +2384,11 @@ void test_term_safety_adapter(void) RUN_TEST(test_repl_ack_abs_peer_idx_endpoint_type_roundtrip); RUN_TEST(test_repl_ack_heartbeat_standby_absolute_slot); RUN_TEST(test_repl_ack_out_of_range_peer_rejected); + /* bug-1479: NACK seam drives the library's nextIndex backoff. */ + RUN_TEST(test_repl_nack_backs_off_next_index_and_returns_corrected_lsn); + RUN_TEST(test_repl_nack_repeated_rejections_floor_at_one); + RUN_TEST(test_repl_nack_out_of_range_peer_rejected); + RUN_TEST(test_nack_immediately_marks_catchup_at_corrected_lsn_not_after_16_strikes); /* Task 5.1: every-callback + marker-path end-to-end integration. */ RUN_TEST(test_every_callback_and_marker_path_end_to_end); } diff --git a/src/controller/testsuite/test_upgrade_snapshot_apply.c b/src/controller/testsuite/test_upgrade_snapshot_apply.c new file mode 100644 index 0000000..d4c1296 --- /dev/null +++ b/src/controller/testsuite/test_upgrade_snapshot_apply.c @@ -0,0 +1,1072 @@ +/* + * test_upgrade_snapshot_apply.c — config-upgrade-snapshot task 5 + * + * TDD tests for the new WAL_CONFIG_MARKER case in apply_committed_entry() + * (persist.c), which forces a checkpoint at exactly the marker's own + * (term, lsn) boundary (Requirements 1.1, 1.5, 1.8, 4.4, 5.2, 5.3). + * + * A naive "just call persist_checkpoint() from the new case" implementation + * has two real hazards this file's tests are specifically shaped to catch: + * + * 1. Lock reentrancy: persist_apply_pump_run() (the live pump's call site + * for BOTH primary and standby online-apply) holds apply_pump_lock + * across its entire per-LSN dispatch loop, including the call into + * apply_committed_entry() that would reach persist_checkpoint(). Since + * persist_checkpoint() itself re-locks that same, non-recursive mutex, + * a naive implementation self-deadlocks the instant a live marker + * apply runs. A test that calls apply_committed_entry() directly and + * in isolation (never through persist_apply_pump_run()) would NOT + * catch this at all — no lock would ever be held. Every test below + * that exercises the live-apply path therefore drives the marker + * through persist_apply_pump_run() itself, the real production call + * site, not a bare direct call. + * + * 2. Stale checkpoint_lsn: persist_checkpoint()'s existing "pin + * checkpoint_lsn = last_applied_lsn" logic reads last_applied_lsn, + * which is only advanced AFTER apply_committed_entry() returns (both + * in persist_apply_pump_run() and in replay_wal()) — never before. A + * naive implementation invoked synchronously from inside the marker's + * own dispatch case would therefore capture the marker's PREDECESSOR's + * lsn, not its own. Every test below appends at least one ordinary + * entry BEFORE the marker so last_applied_lsn genuinely differs from + * the marker's own lsn at the moment this hazard would bite, and + * asserts the resulting checkpoint is labeled with the marker's own + * lsn, not the preceding entry's. + * + * Fixture: a real disk-backed persist_t (persist_init/persist_start over a + * private tmpdir, mirrors test_replay_apply_seam.c's trr_make_fresh_persist + * / test_apply_pump.c's tap_setup) paired with a real but otherwise-empty + * cluster_t (jobmgr/qmgr/workermgr/resmgr + hooksys, mirrors + * test_replay_apply_seam.c's trr_build_cluster) — a disk-backed persist_t is + * required here (unlike test_apply_committed_entry.c's bare in-memory + * fixture) because this case's own effect IS a real checkpoint file write, + * and driving persist_apply_pump_run() for real requires a real WAL on + * disk to read committed entries back from. + * + * Every test below gathers every assertion-relevant observable into a plain + * local variable FIRST, calls its fixture's teardown UNCONDITIONALLY, and + * only THEN runs any TEST_ASSERT — mirroring test_apply_pump.c's own + * documented discipline: a failed assertion's longjmp must never skip + * teardown, or it leaks a live fsync_worker thread (still holding a pointer + * into this test's about-to-be-reused stack frame) into later tests in this + * same binary, corrupting them (the "known longjmp-past-teardown pathology", + * confirmed the hard way while drafting this file — an early draft that + * asserted before tearing down produced a stack-use-after-return crash in + * flusher_fsync_forced_fail on a LATER test's frame the moment an earlier + * test's assertion legitimately failed). + */ + +#include + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +#include "cluster.h" +#include "config_repl.h" +#include "hook.h" +#include "jobj.h" +#include "persist.h" +#include "repl.h" /* repl_add_standby / repl_on_ack -- Gap-1 WAL-trim- + * under-marker-trigger test (task 8.1, Req 7.4), + * mirrors test_e2e_checkpoint.c's own include */ +#include "snapverify.h" /* snapverify_path -- task 8.7 Scenario 1: verify the + * restart-produced checkpoint is structurally + * well-formed, not merely present */ +#include "typemap.h" /* wal_catchup_entry_t -- repl_broadcast_send_hook's + * signature */ +#include "wal_types.h" +#include "xce/cluster_def.h" +#include "xce/types.h" +#include "xstring.h" + +/* jobj.c's jobsub table and the process-global xstring table are shared + * across every test file in the controller_unit_test binary — guard + * idempotently, mirroring every other config-upgrade-snapshot/raft-apply- + * decoupling test file. */ +static int g_tusa_jobobj_ready; + +typedef struct { + cluster_t c; + persist_t p; + char tmpdir[256]; +} tusa_t; + +static void tusa_setup(tusa_t* t) +{ + kvmgr_params_t int_params = { .key_type = KVMGR_KEY_INT, + .nslots = 32, + .delta = 16 }; + kvmgr_params_t str_params = { .key_type = KVMGR_KEY_STRING, + .nslots = 32, + .delta = 16 }; + + if (makeString((char*)"tusa-probe") == NULL) + xstring_table_init(64); + + if (!g_tusa_jobobj_ready) { + TEST_ASSERT_EQUAL_INT(0, job_obj_init(32, 32)); + g_tusa_jobobj_ready = 1; + } + + memset(t, 0, sizeof(*t)); + t->c.myhost = &t->c.myhost_info; + t->c.myhost_info.name = (char*)"ctrl-test"; + t->c.myhost_info.key = (char*)""; + + TEST_ASSERT_EQUAL_INT(0, + xce_hook_init(&t->c.hooksys, XCE_CONTROLLER_HOOK_MAX)); + + t->c.jobmgr = makeInstance(&xkvmgr_type, &int_params); + t->c.qmgr = makeInstance(&xkvmgr_type, &str_params); + t->c.workermgr = makeInstance(&xkvmgr_type, &str_params); + t->c.resmgr = makeInstance(&xkvmgr_type, &str_params); + TEST_ASSERT_NOT_NULL(t->c.jobmgr); + TEST_ASSERT_NOT_NULL(t->c.qmgr); + TEST_ASSERT_NOT_NULL(t->c.workermgr); + TEST_ASSERT_NOT_NULL(t->c.resmgr); + zarray_init(&t->c.sharedinst, 16, NULL); + + strcpy(t->tmpdir, "/tmp/xce_tusa_XXXXXX"); + TEST_ASSERT_NOT_NULL(mkdtemp(t->tmpdir)); + + persist_config_t cfg = persist_config_defaults(); + cfg.wal_sync_ms = 5000; /* slow fsync — no background races in tests */ + cfg.snap_keep_n = 4; + + persist_set_workdir(&t->p, t->tmpdir, "tusa"); + TEST_ASSERT_EQUAL_INT(0, persist_init(&t->p, &cfg, &t->c)); + TEST_ASSERT_EQUAL_INT(0, persist_start(&t->p)); +} + +/* Unconditional teardown — callers must gather every observable they need + * to assert on BEFORE calling this (see file header). */ +static void tusa_teardown(tusa_t* t) +{ + persist_stop(&t->p); + persist_fini(&t->p); + + zarray_fini(&t->c.sharedinst); + if (t->c.resmgr) dereference(t->c.resmgr); + if (t->c.workermgr) dereference(t->c.workermgr); + if (t->c.qmgr) dereference(t->c.qmgr); + if (t->c.jobmgr) dereference(t->c.jobmgr); + xce_hook_fini(&t->c.hooksys); + + char cmd[512]; + snprintf(cmd, sizeof(cmd), "rm -rf %s", t->tmpdir); + if (system(cmd) != 0) + fprintf(stderr, "cleanup warning: rm -rf %s failed\n", t->tmpdir); +} + +/* ── Helpers (none of these call TEST_ASSERT — every result is returned to + * the caller, which asserts only after its fixture is torn down) ────── */ + +static bool tusa_snapshot_exists(persist_t* p, uint64_t lsn) +{ + char path[4096]; + snprintf(path, sizeof(path), "%s/snap-%016" PRIx64 ".capnp", + p->snap_path, lsn); + struct stat st; + return stat(path, &st) == 0; +} + +/* Counts every "snap-*.capnp" file in p->snap_path — used to prove a marker + * apply produces exactly one checkpoint, not zero or two. */ +static int tusa_count_snapshots(persist_t* p) +{ + char cmd[4200]; + snprintf(cmd, sizeof(cmd), "ls %s 2>/dev/null | grep -c '\\.capnp$'", + p->snap_path); + FILE* f = popen(cmd, "r"); + if (!f) return -1; + int n = -1; + if (fscanf(f, "%d", &n) != 1) n = -1; + pclose(f); + return n; +} + +/* Drop hook for repl_broadcast: a fixture that registers a standby with a + * dummy (int) endpoint via repl_add_standby must install this so + * persist_wal_async -> repl_broadcast does not crash trying to send to the + * fake endpoint. Pattern from test_e2e_checkpoint.c (itself from + * test_commit_engine.c / test_p2_integration.c) -- reused here, not + * duplicated logic, for the Gap-1 WAL-trim-under-marker-trigger test + * (task 8.1, Req 7.4). */ +static int tusa_drop_broadcast(void* ep, wal_catchup_entry_t** entries, + int count) +{ + (void)ep; + (void)entries; + (void)count; + return 0; +} + +extern int (*repl_broadcast_send_hook)(void* ep, + wal_catchup_entry_t** entries, + int count); + +/* Checks for a WAL segment file "seg-.wal" at seg_start_lsn inside + * wal_dir -- mirrors test_e2e_checkpoint.c's own seg_file_exists helper + * exactly (same naming convention the production trim/rotate code uses). */ +static bool tusa_seg_file_exists(const char* wal_dir, uint64_t seg_start_lsn) +{ + char path[4096]; + snprintf(path, sizeof(path), "%s/seg-%016" PRIx64 ".wal", + wal_dir, seg_start_lsn); + return access(path, F_OK) == 0; +} + +static int tusa_count_entries(var mgr) +{ + if (!mgr) return 0; + int n = 0; + iterator_t it; + lock(mgr, RTTI_LOCK_READ); + int irc = iter_make(&it, mgr); + if (irc < 0) { + unlock(mgr); + return 0; + } + for (;;) { + void* item = NULL; + int nrc = iter_next(&it, &item); + if (nrc < 0 || nrc == RTTI_ITER_NO_DATA) + break; + if (item) + n++; + } + iter_destroy(&it); + unlock(mgr); + return n; +} + +/* Result of appending one WAL_NOOP followed by one WAL_CONFIG_MARKER and + * advancing committed_lsn to cover both. The leading WAL_NOOP entry is what + * makes last_applied_lsn genuinely differ from the marker's own lsn at the + * moment the marker's case executes — without it, Hazard 2 (stale + * checkpoint_lsn) could not be distinguished from a coincidentally-correct + * implementation. WAL_NOOP is a real, already-classified no-op type (mirrors + * apply_wal_entry's own default treatment) that needs no cluster entity + * setup. */ +typedef struct { + int rc_encode; + int rc_noop; + int rc_marker; + uint64_t noop_lsn; + uint64_t marker_lsn; + uint64_t committed_after; +} tusa_append_result_t; + +static tusa_append_result_t tusa_append_noop_then_marker(persist_t* p, + uint8_t seed) +{ + tusa_append_result_t r; + memset(&r, 0, sizeof(r)); + + r.rc_noop = persist_wal_async(p, WAL_NOOP, NULL, 0); + r.noop_lsn = p->current_lsn - 1; + + uint8_t sha[32]; + memset(sha, seed, sizeof(sha)); + uint8_t marker_payload[WAL_CONFIG_MARKER_PAYLOAD_LEN]; + size_t out_len = 0; + r.rc_encode = config_marker_encode(0x1122334455667788ULL ^ seed, sha, + marker_payload, + WAL_CONFIG_MARKER_PAYLOAD_LEN, + &out_len); + + r.rc_marker = persist_wal_async(p, WAL_CONFIG_MARKER, marker_payload, + WAL_CONFIG_MARKER_PAYLOAD_LEN); + r.marker_lsn = p->current_lsn - 1; + + r.committed_after = persist_committed_lsn_advance_atomic(p, r.marker_lsn); + return r; +} + +/* ── 1: live pump path — proves both hazards are fixed ─────────────────── */ + +static void +test_marker_apply_via_live_pump_checkpoints_at_marker_own_lsn(void) +{ + tusa_t t; + tusa_setup(&t); + + tusa_append_result_t ar = tusa_append_noop_then_marker(&t.p, 0xA1); + + /* The real production call site: persist_apply_pump_run() holds + * apply_pump_lock across this entire call, exactly as it does for a + * live primary/standby apply. If Hazard 1 (lock reentrancy) were not + * fixed, this call would self-deadlock and never return -- the test + * binary would hang here rather than fail cleanly, which is itself the + * signal (see the CRITICAL note in this task's validation commands). */ + int applied = persist_apply_pump_run(&t.p); + + uint64_t last_applied = atomic_load_explicit(&t.p.last_applied_lsn, + memory_order_acquire); + uint64_t checkpoint_lsn = t.p.checkpoint_lsn; + bool snap_at_marker = tusa_snapshot_exists(&t.p, ar.marker_lsn); + bool snap_at_predecessor = (ar.marker_lsn > 0) + ? tusa_snapshot_exists(&t.p, ar.marker_lsn - 1) : false; + + tusa_teardown(&t); + + TEST_ASSERT_EQUAL_INT(0, ar.rc_encode); + TEST_ASSERT_EQUAL_INT(0, ar.rc_noop); + TEST_ASSERT_EQUAL_INT(0, ar.rc_marker); + TEST_ASSERT_EQUAL_UINT64(ar.noop_lsn + 1, ar.marker_lsn); + TEST_ASSERT_EQUAL_UINT64(ar.marker_lsn, ar.committed_after); + + TEST_ASSERT_EQUAL_INT(2, applied); + TEST_ASSERT_EQUAL_UINT64(ar.marker_lsn, last_applied); + + /* Hazard 2 proof: checkpoint_lsn must equal the MARKER's own lsn, not + * the preceding WAL_NOOP's (marker_lsn - 1) -- which is exactly what a + * stale "checkpoint_lsn = last_applied_lsn read from inside the case" + * implementation would have produced, since last_applied_lsn was still + * pinned at marker_lsn - 1 at the moment the case ran. */ + TEST_ASSERT_EQUAL_UINT64(ar.marker_lsn, checkpoint_lsn); + + TEST_ASSERT_TRUE_MESSAGE(snap_at_marker, + "forced checkpoint must produce a snap file at the marker's own lsn"); + TEST_ASSERT_FALSE_MESSAGE(snap_at_predecessor, + "must NOT checkpoint at the preceding entry's lsn"); + + printf("test_marker_apply_via_live_pump_checkpoints_at_marker_own_lsn: PASS\n"); +} + +/* ── 2: fires exactly once per marker apply ─────────────────────────────── */ + +static void test_marker_apply_fires_checkpoint_exactly_once(void) +{ + tusa_t t; + tusa_setup(&t); + + int before = tusa_count_snapshots(&t.p); + + tusa_append_result_t ar = tusa_append_noop_then_marker(&t.p, 0xB2); + int applied = persist_apply_pump_run(&t.p); + + int after = tusa_count_snapshots(&t.p); + int checkpoint_flag = atomic_load(&t.p.checkpoint_in_progress); + + tusa_teardown(&t); + + TEST_ASSERT_EQUAL_INT(0, ar.rc_encode); + TEST_ASSERT_EQUAL_INT(0, ar.rc_noop); + TEST_ASSERT_EQUAL_INT(0, ar.rc_marker); + TEST_ASSERT_EQUAL_INT(2, applied); + + TEST_ASSERT_EQUAL_INT(0, before); + TEST_ASSERT_EQUAL_INT_MESSAGE(1, after, + "exactly one checkpoint file must exist after one marker apply"); + + /* The shared single-in-flight guard must be released again afterward, + * not left stuck (which would silently wedge every future periodic + * checkpoint too). */ + TEST_ASSERT_EQUAL_INT(0, checkpoint_flag); + + printf("test_marker_apply_fires_checkpoint_exactly_once: PASS\n"); +} + +/* ── 3: retry (re-apply of an already-applied marker) is idempotent ────── */ + +static void test_marker_apply_retry_is_idempotent(void) +{ + tusa_t t; + tusa_setup(&t); + + tusa_append_result_t ar = tusa_append_noop_then_marker(&t.p, 0xC3); + int applied = persist_apply_pump_run(&t.p); + bool snap_after_first = tusa_snapshot_exists(&t.p, ar.marker_lsn); + + /* Simulate a retried re-application of the SAME already-applied marker + * (e.g. a second replay pass after a crash) by calling the dispatch + * seam directly for the identical (type, lsn) a second time -- design.md's + * own named observable ("safe under a forced retry"). Neither + * persist_apply_pump_run() (already advanced past this lsn) nor + * replay_wal() would normally re-dispatch it live, but apply_committed_ + * entry() itself must not corrupt or crash on a direct re-drive. No + * external lock is held here, mirroring the boot-replay calling + * convention (persist_checkpoint_marker_triggered() needs none). */ + uint8_t sha[32]; + memset(sha, 0xC3, sizeof(sha)); + uint8_t marker_payload[WAL_CONFIG_MARKER_PAYLOAD_LEN]; + size_t out_len = 0; + int rc_encode = config_marker_encode(0x1122334455667788ULL ^ 0xC3, sha, + marker_payload, + WAL_CONFIG_MARKER_PAYLOAD_LEN, + &out_len); + int retry_rc = apply_committed_entry(&t.p, WAL_CONFIG_MARKER, + ar.marker_lsn, marker_payload, + WAL_CONFIG_MARKER_PAYLOAD_LEN); + + bool snap_after_retry = tusa_snapshot_exists(&t.p, ar.marker_lsn); + uint64_t checkpoint_lsn = t.p.checkpoint_lsn; + int checkpoint_flag = atomic_load(&t.p.checkpoint_in_progress); + + tusa_teardown(&t); + + TEST_ASSERT_EQUAL_INT(0, ar.rc_encode); + TEST_ASSERT_EQUAL_INT(0, ar.rc_noop); + TEST_ASSERT_EQUAL_INT(0, ar.rc_marker); + TEST_ASSERT_EQUAL_INT(2, applied); + TEST_ASSERT_TRUE(snap_after_first); + TEST_ASSERT_EQUAL_INT(0, rc_encode); + + TEST_ASSERT_EQUAL_INT_MESSAGE(0, retry_rc, + "a retried marker apply at an already-checkpointed lsn must not error"); + TEST_ASSERT_TRUE_MESSAGE(snap_after_retry, + "the checkpoint file at the marker's lsn must still be present and valid"); + TEST_ASSERT_EQUAL_UINT64(ar.marker_lsn, checkpoint_lsn); + TEST_ASSERT_EQUAL_INT(0, checkpoint_flag); + + printf("test_marker_apply_retry_is_idempotent: PASS\n"); +} + +/* ── 4: overlapping-marker -EBUSY is graceful, not an error ────────────── */ + +static void test_marker_apply_busy_checkpoint_handled_gracefully(void) +{ + tusa_t t; + tusa_setup(&t); + + tusa_append_result_t ar = tusa_append_noop_then_marker(&t.p, 0xD4); + + /* Simulate an earlier marker's (or a periodic WAL-threshold) checkpoint + * already being in flight when this marker's own apply runs — the + * shared checkpoint_in_progress CAS is already held by "someone else". */ + int prev_flag = atomic_exchange(&t.p.checkpoint_in_progress, 1); + + /* The live pump must NOT halt or surface an error on -EBUSY (Req 4.4): + * both entries still apply, last_applied_lsn still advances past the + * marker, and no crash/retry-loop occurs. */ + int applied = persist_apply_pump_run(&t.p); + + uint64_t last_applied = atomic_load_explicit(&t.p.last_applied_lsn, + memory_order_acquire); + bool snap_while_busy = tusa_snapshot_exists(&t.p, ar.marker_lsn); + + /* Self-resolving (Req 4.4): release the guard (as the "other" in-flight + * checkpoint would on its own completion) and confirm a normal + * checkpoint afterward still correctly picks up this marker's position. */ + atomic_store(&t.p.checkpoint_in_progress, 0); + int resolve_rc = persist_checkpoint(&t.p); + uint64_t checkpoint_lsn = t.p.checkpoint_lsn; + bool snap_after_resolve = tusa_snapshot_exists(&t.p, ar.marker_lsn); + + tusa_teardown(&t); + + TEST_ASSERT_EQUAL_INT(0, ar.rc_encode); + TEST_ASSERT_EQUAL_INT(0, ar.rc_noop); + TEST_ASSERT_EQUAL_INT(0, ar.rc_marker); + TEST_ASSERT_EQUAL_INT(0, prev_flag); + + TEST_ASSERT_EQUAL_INT_MESSAGE(2, applied, + "an in-flight concurrent checkpoint must not halt the apply pump"); + TEST_ASSERT_EQUAL_UINT64(ar.marker_lsn, last_applied); + + /* Because the guard was already held, THIS marker's own checkpoint call + * must have been skipped entirely -- no snapshot at its lsn yet. */ + TEST_ASSERT_FALSE_MESSAGE(snap_while_busy, + "a busy checkpoint must be skipped, not forced through"); + + TEST_ASSERT_EQUAL_INT(0, resolve_rc); + TEST_ASSERT_EQUAL_UINT64(ar.marker_lsn, checkpoint_lsn); + TEST_ASSERT_TRUE(snap_after_resolve); + + printf("test_marker_apply_busy_checkpoint_handled_gracefully: PASS\n"); +} + +/* ── 5: apply must not itself reinterpret/re-home entities (Req 1.8) ───── */ + +static void test_marker_apply_does_not_reinterpret_entities(void) +{ + tusa_t t; + tusa_setup(&t); + + /* Baseline: nothing exists yet, in particular no lost_and_found queue + * or host -- the concrete, observable side effect any accidental + * re-homing trigger from this case would produce. */ + int qmgr_before = tusa_count_entries(t.c.qmgr); + int workermgr_before = tusa_count_entries(t.c.workermgr); + int jobmgr_before = tusa_count_entries(t.c.jobmgr); + + tusa_append_result_t ar = tusa_append_noop_then_marker(&t.p, 0xE5); + int applied = persist_apply_pump_run(&t.p); + + int qmgr_after = tusa_count_entries(t.c.qmgr); + int workermgr_after = tusa_count_entries(t.c.workermgr); + int jobmgr_after = tusa_count_entries(t.c.jobmgr); + + tusa_teardown(&t); + + TEST_ASSERT_EQUAL_INT(0, ar.rc_encode); + TEST_ASSERT_EQUAL_INT(0, ar.rc_noop); + TEST_ASSERT_EQUAL_INT(0, ar.rc_marker); + TEST_ASSERT_EQUAL_INT(2, applied); + + TEST_ASSERT_EQUAL_INT(0, qmgr_before); + TEST_ASSERT_EQUAL_INT(0, workermgr_before); + TEST_ASSERT_EQUAL_INT(0, jobmgr_before); + + /* Applying the marker must ONLY materialize a checkpoint -- it must not + * create, remove, or re-home any job/queue/host entity (that + * interpretive switch is the later activation step's job, not apply's, + * per Req 1.8). */ + TEST_ASSERT_EQUAL_INT_MESSAGE(0, qmgr_after, + "marker apply must not create any queue (e.g. lost_and_found)"); + TEST_ASSERT_EQUAL_INT_MESSAGE(0, workermgr_after, + "marker apply must not create any host (e.g. lost_and_found)"); + TEST_ASSERT_EQUAL_INT_MESSAGE(0, jobmgr_after, + "marker apply must not create or remove any job"); + + printf("test_marker_apply_does_not_reinterpret_entities: PASS\n"); +} + +/* ── 6: restart replay drives the SAME case (Req 1.1's "replay alike") ──── */ + +static void test_marker_apply_via_replay_checkpoints_at_marker_own_lsn(void) +{ + char tmp[256]; + strcpy(tmp, "/tmp/xce_tusa_replay_XXXXXX"); + char* mkd_rc = mkdtemp(tmp); + + uint64_t marker_lsn = 0; + int rc_noop_p1 = -1; + int rc_marker_p1 = -1; + int rc_encode_p1 = -1; + int rc_flush_p1 = -1; + + /* Phase 1: write a WAL_NOOP then a WAL_CONFIG_MARKER to a fresh, real + * WAL -- no cluster needed for a pure physical write. */ + { + persist_t p; + memset(&p, 0, sizeof(p)); + persist_config_t cfg = persist_config_defaults(); + cfg.wal_sync_ms = 5000; + persist_set_workdir(&p, tmp, "tusa-replay"); + int rc_init = persist_init(&p, &cfg, NULL); + int rc_start = persist_start(&p); + + rc_noop_p1 = persist_wal_async(&p, WAL_NOOP, NULL, 0); + + uint8_t sha[32]; + memset(sha, 0xF6, sizeof(sha)); + uint8_t marker_payload[WAL_CONFIG_MARKER_PAYLOAD_LEN]; + size_t out_len = 0; + rc_encode_p1 = config_marker_encode(0x1122334455667788ULL ^ 0xF6, sha, + marker_payload, + WAL_CONFIG_MARKER_PAYLOAD_LEN, + &out_len); + rc_marker_p1 = persist_wal_async(&p, WAL_CONFIG_MARKER, + marker_payload, + WAL_CONFIG_MARKER_PAYLOAD_LEN); + marker_lsn = p.current_lsn - 1; + rc_flush_p1 = persist_flush(&p); + + persist_stop(&p); + persist_fini(&p); + + TEST_ASSERT_EQUAL_INT(0, rc_init); + TEST_ASSERT_EQUAL_INT(0, rc_start); + } + + /* Phase 2: fresh persist_t + fresh cluster_t, recover from disk. Boot + * replay (persist_recover -> replay_wal) is the SECOND production call + * site of apply_committed_entry() -- unlike the live pump, it does NOT + * hold apply_pump_lock, proving persist_checkpoint_marker_triggered() + * is correct under both calling conventions, not just the locked one. */ + tusa_t t2; + memset(&t2, 0, sizeof(t2)); + strncpy(t2.tmpdir, tmp, sizeof(t2.tmpdir) - 1); + + t2.c.myhost = &t2.c.myhost_info; + t2.c.myhost_info.name = (char*)"ctrl-test-2"; + t2.c.myhost_info.key = (char*)""; + int rc_hook = xce_hook_init(&t2.c.hooksys, XCE_CONTROLLER_HOOK_MAX); + + kvmgr_params_t int_params = { .key_type = KVMGR_KEY_INT, + .nslots = 32, .delta = 16 }; + kvmgr_params_t str_params = { .key_type = KVMGR_KEY_STRING, + .nslots = 32, .delta = 16 }; + t2.c.jobmgr = makeInstance(&xkvmgr_type, &int_params); + t2.c.qmgr = makeInstance(&xkvmgr_type, &str_params); + t2.c.workermgr = makeInstance(&xkvmgr_type, &str_params); + t2.c.resmgr = makeInstance(&xkvmgr_type, &str_params); + zarray_init(&t2.c.sharedinst, 16, NULL); + + persist_config_t cfg2 = persist_config_defaults(); + cfg2.wal_sync_ms = 5000; + persist_set_workdir(&t2.p, tmp, "tusa-replay"); + int rc_init2 = persist_init(&t2.p, &cfg2, &t2.c); + int rc_start2 = persist_start(&t2.p); + + int rc_recover = persist_recover(&t2.p); + + uint64_t checkpoint_lsn = t2.p.checkpoint_lsn; + bool snap_exists = tusa_snapshot_exists(&t2.p, marker_lsn); + + tusa_teardown(&t2); + + char cmd[512]; + snprintf(cmd, sizeof(cmd), "rm -rf %s", tmp); + if (system(cmd) != 0) + fprintf(stderr, "cleanup warning: rm -rf %s failed\n", tmp); + + TEST_ASSERT_NOT_NULL(mkd_rc); + TEST_ASSERT_EQUAL_INT(0, rc_noop_p1); + TEST_ASSERT_EQUAL_INT(0, rc_encode_p1); + TEST_ASSERT_EQUAL_INT(0, rc_marker_p1); + TEST_ASSERT_EQUAL_INT(0, rc_flush_p1); + + TEST_ASSERT_EQUAL_INT(0, rc_hook); + TEST_ASSERT_NOT_NULL(t2.c.jobmgr); + TEST_ASSERT_NOT_NULL(t2.c.qmgr); + TEST_ASSERT_NOT_NULL(t2.c.workermgr); + TEST_ASSERT_NOT_NULL(t2.c.resmgr); + TEST_ASSERT_EQUAL_INT(0, rc_init2); + TEST_ASSERT_EQUAL_INT(0, rc_start2); + TEST_ASSERT_EQUAL_INT(0, rc_recover); + + TEST_ASSERT_EQUAL_UINT64(marker_lsn, checkpoint_lsn); + TEST_ASSERT_TRUE_MESSAGE(snap_exists, + "boot replay of a WAL_CONFIG_MARKER must also produce a " + "checkpoint at the marker's own lsn"); + + printf("test_marker_apply_via_replay_checkpoints_at_marker_own_lsn: PASS\n"); +} + +/* ── 7: WAL-trim safety under the marker-triggered path (Req 7.4) ─────── + * + * Six existing tests already prove trim_wal_segments()'s standby-cursor + * retention guard (repl_trim_lsn(), bug-1147) holds under the OLD trigger + * -- a direct/periodic persist_checkpoint() call: + * test_e2e_checkpoint.c's test_trim_guard_preserves_standby_segments, plus + * repl_trim_lsn()'s own unit coverage in test_repl_unit.c / + * test_p2_integration.c. None of them drive that SAME guard through this + * spec's NEW trigger -- a WAL_CONFIG_MARKER committed and applied via the + * real apply_committed_entry()/persist_apply_pump_run() path, which + * reaches the identical, unmodified trim_wal_segments()/repl_trim_lsn() + * code via persist_checkpoint_marker_triggered() instead of a bare + * persist_checkpoint() call. That is a real, previously-flagged coverage + * gap (task 5's own implementation notes), not something covered by proxy + * -- this test closes it. + * + * Uses this file's own real-cluster tusa_t fixture, not + * test_e2e_checkpoint.c's cluster-less make_ckpt_e2e() -- apply_committed_ + * entry() short-circuits to a no-op whenever p->cluster is NULL, so a + * cluster-less fixture would never actually reach persist_checkpoint_ + * marker_triggered() at all and could not exercise this path. WAL_NOOP is + * used for every filler entry (rather than test_e2e_checkpoint.c's + * WAL_JOB_UPDATE) because that file's fixture has no cluster to apply a + * job update against; WAL_NOOP is safe against a real cluster (default: + * no-op case), exactly as tusa_append_noop_then_marker() already relies on + * elsewhere in this file. + * + * Layout mirrors test_trim_guard_preserves_standby_segments' own LSN + * numbering exactly, for direct comparability: + * noop @ lsn1=1 → force segment (seg-1 closes, seg-2 opens @ lsn2=2) + * noop @ lsn2=2 → standby acks lsn2 (mid-catch-up: this is the LAST + * position it has acked -- in particular it has NOT + * acked the marker below) + * → force segment (seg-2 closes, seg-3 opens @ lsn3=3, + * stays active -- no further force call) + * noop @ lsn3=3 → keeps last_applied_lsn genuinely behind the marker's + * own lsn at dispatch time (same discipline this file's + * other tests already document as Hazard 2) + * WAL_CONFIG_MARKER @ marker_lsn=4 → committed → applied via + * persist_apply_pump_run(), which dispatches into apply_committed_ + * entry()'s WAL_CONFIG_MARKER case → persist_checkpoint_marker_ + * triggered() → trim_wal_segments(). + * + * floor = repl_trim_lsn(active_seg_lsn=3, standby acked=2) = min(3,2) = 2: + * seg-1 (start=1) < floor → MUST be trimmed + * seg-2 (start=2) == floor → MUST be preserved (the standby still needs + * it for catch-up -- exactly bug-1147's guard) + * seg-3 (start=3, active) → MUST always be preserved + */ + +static void +test_marker_triggered_checkpoint_trim_preserves_standby_mid_catchup_segments(void) +{ + tusa_t t; + tusa_setup(&t); + + repl_broadcast_send_hook = tusa_drop_broadcast; + + int dummy_ep = 0; + int standby_idx = repl_add_standby(&t.p.repl, (void*)&dummy_ep, + "standby1", 7001); + + int rc_noop1 = persist_wal_async(&t.p, WAL_NOOP, NULL, 0); + uint64_t lsn1 = t.p.current_lsn - 1; + int rc_force1 = persist_test_force_new_segment(&t.p); + + int rc_noop2 = persist_wal_async(&t.p, WAL_NOOP, NULL, 0); + uint64_t lsn2 = t.p.current_lsn - 1; + repl_on_ack(&t.p.repl, (void*)&dummy_ep, lsn2); + int rc_force2 = persist_test_force_new_segment(&t.p); + uint64_t active_seg_lsn = t.p.current_lsn; /* seg-3 opens here */ + + int rc_noop3 = persist_wal_async(&t.p, WAL_NOOP, NULL, 0); + + uint8_t sha[32]; + memset(sha, 0xA7, sizeof(sha)); + uint8_t marker_payload[WAL_CONFIG_MARKER_PAYLOAD_LEN]; + size_t out_len = 0; + int rc_encode = config_marker_encode(0x1122334455667788ULL ^ 0xA7, sha, + marker_payload, + WAL_CONFIG_MARKER_PAYLOAD_LEN, + &out_len); + int rc_marker = persist_wal_async(&t.p, WAL_CONFIG_MARKER, marker_payload, + WAL_CONFIG_MARKER_PAYLOAD_LEN); + uint64_t marker_lsn = t.p.current_lsn - 1; + uint64_t committed_after = + persist_committed_lsn_advance_atomic(&t.p, marker_lsn); + + int applied = persist_apply_pump_run(&t.p); + + bool seg1_exists = tusa_seg_file_exists(t.p.wal_path, lsn1); + bool seg2_exists = tusa_seg_file_exists(t.p.wal_path, lsn2); + bool seg3_exists = tusa_seg_file_exists(t.p.wal_path, active_seg_lsn); + bool snap_at_marker = tusa_snapshot_exists(&t.p, marker_lsn); + + repl_broadcast_send_hook = NULL; + tusa_teardown(&t); + + TEST_ASSERT_TRUE(standby_idx >= 0); + TEST_ASSERT_EQUAL_INT(0, rc_noop1); + TEST_ASSERT_EQUAL_INT(0, rc_force1); + TEST_ASSERT_EQUAL_INT(0, rc_noop2); + TEST_ASSERT_EQUAL_INT(0, rc_force2); + TEST_ASSERT_EQUAL_INT(0, rc_noop3); + TEST_ASSERT_EQUAL_INT(0, rc_encode); + TEST_ASSERT_EQUAL_INT(0, rc_marker); + TEST_ASSERT_EQUAL_UINT64(1, lsn1); + TEST_ASSERT_EQUAL_UINT64(2, lsn2); + TEST_ASSERT_EQUAL_UINT64(3, active_seg_lsn); + TEST_ASSERT_EQUAL_UINT64(4, marker_lsn); + TEST_ASSERT_EQUAL_UINT64(marker_lsn, committed_after); + TEST_ASSERT_EQUAL_INT_MESSAGE(4, applied, + "all four entries (3 noops + the marker) must apply successfully"); + TEST_ASSERT_TRUE_MESSAGE(snap_at_marker, + "the marker-triggered checkpoint must still fire and produce a " + "snapshot even with a standby mid-catch-up"); + + TEST_ASSERT_FALSE_MESSAGE(seg1_exists, + "seg-1: below the standby's mid-catch-up acked_lsn=2, MUST be " + "trimmed by the marker-triggered checkpoint"); + TEST_ASSERT_TRUE_MESSAGE(seg2_exists, + "seg-2: at the standby's mid-catch-up acked_lsn=2, MUST be " + "preserved (bug-1147 guard) even when trim runs via the NEW " + "marker-triggered path"); + TEST_ASSERT_TRUE_MESSAGE(seg3_exists, + "seg-3: the active segment, MUST always be preserved"); + + printf("test_marker_triggered_checkpoint_trim_preserves_standby_" + "mid_catchup_segments: PASS\n"); +} + +/* ── 8: fault-injection seam at the marker-apply→checkpoint-durable + * boundary (Req 6.3) ─────────────────────────────────────────────── + * + * Proves the new persist_marker_checkpoint_fault_hook seam (persist.c, + * added by this task) fires exactly once for the marker's own (p, lsn) and + * correctly gates whether persist_checkpoint_marker_triggered() is called + * at all. This is deliberately ONLY the seam itself, not the full + * crash/restart regression -- that is task 8.7's job, which depends on + * this seam landing first. + */ + +typedef struct { + int calls; + persist_t* last_p; + uint64_t last_lsn; +} tusa_fault_obs_t; + +static tusa_fault_obs_t g_tusa_fault_obs; + +static int tusa_marker_fault_hook(persist_t* p, uint64_t marker_lsn) +{ + g_tusa_fault_obs.calls++; + g_tusa_fault_obs.last_p = p; + g_tusa_fault_obs.last_lsn = marker_lsn; + return 1; /* simulate "the process never got to checkpoint" */ +} + +static void test_marker_checkpoint_fault_hook_gates_checkpoint_call(void) +{ + tusa_t t; + extern int (*persist_marker_checkpoint_fault_hook)(persist_t* p, + uint64_t marker_lsn); + + tusa_setup(&t); + + memset(&g_tusa_fault_obs, 0, sizeof(g_tusa_fault_obs)); + persist_marker_checkpoint_fault_hook = tusa_marker_fault_hook; + + tusa_append_result_t ar = tusa_append_noop_then_marker(&t.p, 0x17); + int apply_rc = persist_apply_pump_run(&t.p); + + bool snap_at_marker = tusa_snapshot_exists(&t.p, ar.marker_lsn); + uint64_t last_applied = atomic_load_explicit(&t.p.last_applied_lsn, + memory_order_acquire); + int fault_calls = g_tusa_fault_obs.calls; + uint64_t fault_lsn = g_tusa_fault_obs.last_lsn; + bool fault_p_matches = (g_tusa_fault_obs.last_p == &t.p); + + persist_marker_checkpoint_fault_hook = NULL; + tusa_teardown(&t); + + TEST_ASSERT_EQUAL_INT(0, ar.rc_encode); + TEST_ASSERT_EQUAL_INT(0, ar.rc_noop); + TEST_ASSERT_EQUAL_INT(0, ar.rc_marker); + + TEST_ASSERT_EQUAL_INT_MESSAGE(1, fault_calls, + "the fault hook must fire exactly once, for the marker's own " + "checkpoint attempt"); + TEST_ASSERT_EQUAL_UINT64(ar.marker_lsn, fault_lsn); + TEST_ASSERT_TRUE_MESSAGE(fault_p_matches, + "the fault hook must observe the SAME persist_t the marker is " + "being applied to"); + + TEST_ASSERT_EQUAL_INT_MESSAGE(-ECANCELED, apply_rc, + "a nonzero fault-hook return must propagate as the marker's apply " + "failure, taking the SAME halt-and-retry path a genuine checkpoint " + "I/O error already takes"); + TEST_ASSERT_FALSE_MESSAGE(snap_at_marker, + "a nonzero fault-hook return must skip the checkpoint call " + "entirely -- no snapshot file at the marker's lsn"); + TEST_ASSERT_EQUAL_UINT64_MESSAGE(ar.noop_lsn, last_applied, + "last_applied_lsn must NOT advance past the marker when the " + "checkpoint is skipped by the fault hook -- materialization must " + "resume from the marker on the next attempt"); + + printf("test_marker_checkpoint_fault_hook_gates_checkpoint_call: " + "PASS\n"); +} + +/* ── 9: crash before checkpoint durable, restart resumes materialization + * (task 8.7 Scenario 1, Req 5.2, 5.3, 5.5) ───────────────────────── + * + * Builds directly on test 8's fault-hook seam above, whose own header + * comment is explicit that it proves ONLY the seam itself -- "not the full + * crash/restart regression -- that is task 8.7's job, which depends on + * this seam landing first." This test is that job. + * + * Phase 1 ("crash"): drive the marker's apply through the live pump with + * the fault hook forcing "the checkpoint write never completed" -- the + * same mechanics test 8 already proves in isolation (apply_rc == + * -ECANCELED, no snapshot at the marker's lsn, last_applied_lsn stuck + * below it). This test re-confirms that baseline lightly (not exhaustively + * -- test 8 already owns that) and then goes one step further: physically + * tear down this persist_t/cluster_t WITHOUT deleting the on-disk tmpdir, + * mirroring test 6's own phase-1/phase-2 split exactly (test 6 is this + * same file's established pattern for simulating "the process exits and a + * fresh one boots against the same on-disk state" -- persist_stop/ + * persist_fini inline, no rm -rf until the very end). + * + * Phase 2 ("restart succeeds this time"): clear the fault hook (the + * transient condition that caused the crash is gone), boot a genuinely + * FRESH persist_t + cluster_t against the SAME tmpdir/name, and call + * persist_recover() -- boot replay, the SECOND real production call site + * of apply_committed_entry() (test 6 above already proves this is a valid, + * lock-free calling convention for the marker case). A bare re-call of + * persist_apply_pump_run() on the SAME in-memory instance was deliberately + * rejected in favor of this: last_applied_lsn never advanced past the + * marker in phase 1, so a same-process re-call would only prove "this + * process retries," not "a genuinely restarted process resumes from + * durable state" -- persist_recover() against a fresh instance is the + * faithful simulation Requirement 5.2 actually describes. Because + * checkpoint_lsn was never advanced past 0 in phase 1 (no checkpoint ever + * wrote), replay restarts from lsn 1 and re-drives both the noop and the + * marker through apply_committed_entry() fresh -- this time succeeding. + * + * Phase 3 (idempotent re-restart, Req 5.3 in this exact crash/retry + * shape): call persist_recover() a SECOND time on the already-recovered + * instance (test_persist_recovery.c's own test_recover_from_empty_state + * documents this as valid: "persist_recover() is valid to call on a + * running instance too") -- proves a second, redundant "restart" after + * materialization already succeeded does not duplicate or corrupt the + * checkpoint. test_marker_apply_retry_is_idempotent (test 3 above) already + * covers a DIFFERENT retry shape -- a bare, same-process direct + * re-dispatch of apply_committed_entry(), never a real boot replay -- so + * this is not a duplicate of that coverage, it closes the boot-replay- + * specific shape that test doesn't touch. + * + * Discipline note: per this file's own header, every assertion-relevant + * observable across all three phases is gathered into a local variable + * FIRST; no TEST_ASSERT runs until every phase's teardown has already + * happened (avoids the documented longjmp-past-teardown pathology). + */ + +static void +test_marker_checkpoint_fault_hook_crash_then_restart_resumes_materialization(void) +{ + extern int (*persist_marker_checkpoint_fault_hook)(persist_t* p, + uint64_t marker_lsn); + tusa_t t; + tusa_setup(&t); + + memset(&g_tusa_fault_obs, 0, sizeof(g_tusa_fault_obs)); + persist_marker_checkpoint_fault_hook = tusa_marker_fault_hook; + + tusa_append_result_t ar = tusa_append_noop_then_marker(&t.p, 0x8A); + int crash_apply_rc = persist_apply_pump_run(&t.p); + + bool crash_snap_exists = tusa_snapshot_exists(&t.p, ar.marker_lsn); + uint64_t crash_last_applied = atomic_load_explicit( + &t.p.last_applied_lsn, memory_order_acquire); + int crash_fault_calls = g_tusa_fault_obs.calls; + + /* "Crash": tear down this instance WITHOUT deleting the on-disk tmpdir + * -- mirrors test 6's own phase-1 teardown exactly (persist_stop/ + * persist_fini + mgr cleanup inline, no tusa_teardown/rm -rf until the + * very end of this test, after phase 2/3 have had a chance to read the + * same directory). */ + persist_stop(&t.p); + persist_fini(&t.p); + zarray_fini(&t.c.sharedinst); + if (t.c.resmgr) dereference(t.c.resmgr); + if (t.c.workermgr) dereference(t.c.workermgr); + if (t.c.qmgr) dereference(t.c.qmgr); + if (t.c.jobmgr) dereference(t.c.jobmgr); + xce_hook_fini(&t.c.hooksys); + + /* "Restart succeeds this time": the transient condition that caused + * the crash is gone. */ + persist_marker_checkpoint_fault_hook = NULL; + + /* Phase 2: fresh persist_t + fresh cluster_t, SAME tmpdir/name as phase + * 1 -- boot replay (persist_recover -> replay_wal), mirrors test 6's + * own phase-2 construction exactly. */ + kvmgr_params_t int_params = { .key_type = KVMGR_KEY_INT, + .nslots = 32, .delta = 16 }; + kvmgr_params_t str_params = { .key_type = KVMGR_KEY_STRING, + .nslots = 32, .delta = 16 }; + tusa_t t2; + memset(&t2, 0, sizeof(t2)); + strncpy(t2.tmpdir, t.tmpdir, sizeof(t2.tmpdir) - 1); + t2.c.myhost = &t2.c.myhost_info; + t2.c.myhost_info.name = (char*)"ctrl-test-restart"; + t2.c.myhost_info.key = (char*)""; + int rc_hook2 = xce_hook_init(&t2.c.hooksys, XCE_CONTROLLER_HOOK_MAX); + t2.c.jobmgr = makeInstance(&xkvmgr_type, &int_params); + t2.c.qmgr = makeInstance(&xkvmgr_type, &str_params); + t2.c.workermgr = makeInstance(&xkvmgr_type, &str_params); + t2.c.resmgr = makeInstance(&xkvmgr_type, &str_params); + zarray_init(&t2.c.sharedinst, 16, NULL); + + persist_config_t cfg2 = persist_config_defaults(); + cfg2.wal_sync_ms = 5000; + cfg2.snap_keep_n = 4; + persist_set_workdir(&t2.p, t.tmpdir, "tusa"); + int rc_init2 = persist_init(&t2.p, &cfg2, &t2.c); + int rc_start2 = persist_start(&t2.p); + + int rc_recover = persist_recover(&t2.p); + + uint64_t restart_checkpoint_lsn = t2.p.checkpoint_lsn; + bool restart_snap_exists = tusa_snapshot_exists(&t2.p, ar.marker_lsn); + uint64_t restart_last_applied = atomic_load_explicit( + &t2.p.last_applied_lsn, memory_order_acquire); + int restart_fault_calls = g_tusa_fault_obs.calls; + + char snap_path[4096]; + snprintf(snap_path, sizeof(snap_path), "%s/snap-%016" PRIx64 ".capnp", + t2.p.snap_path, ar.marker_lsn); + snapverify_report_t verify_rep; + memset(&verify_rep, 0, sizeof(verify_rep)); + int verify_rc = snapverify_path(snap_path, NULL, &verify_rep); + + /* Phase 3: a SECOND, redundant "restart" after materialization already + * succeeded -- proves idempotency in this exact crash/retry shape. */ + int rc_recover_again = persist_recover(&t2.p); + uint64_t checkpoint_lsn_after_second_recover = t2.p.checkpoint_lsn; + int snap_count_after_second_recover = tusa_count_snapshots(&t2.p); + + tusa_teardown(&t2); + + /* ── Assertions (only now, after every phase's teardown) ───────────── */ + + TEST_ASSERT_EQUAL_INT(0, ar.rc_encode); + TEST_ASSERT_EQUAL_INT(0, ar.rc_noop); + TEST_ASSERT_EQUAL_INT(0, ar.rc_marker); + TEST_ASSERT_EQUAL_INT_MESSAGE(1, crash_fault_calls, + "fault hook must have fired exactly once to force the simulated " + "crash"); + TEST_ASSERT_EQUAL_INT_MESSAGE(-ECANCELED, crash_apply_rc, + "the simulated crash must surface as the marker's apply failure"); + TEST_ASSERT_FALSE_MESSAGE(crash_snap_exists, + "crash state: no checkpoint must exist at the marker's lsn yet"); + TEST_ASSERT_EQUAL_UINT64_MESSAGE(ar.noop_lsn, crash_last_applied, + "crash state: last_applied_lsn must be stuck below the marker"); + + TEST_ASSERT_EQUAL_INT(0, rc_hook2); + TEST_ASSERT_NOT_NULL(t2.c.jobmgr); + TEST_ASSERT_NOT_NULL(t2.c.qmgr); + TEST_ASSERT_NOT_NULL(t2.c.workermgr); + TEST_ASSERT_NOT_NULL(t2.c.resmgr); + TEST_ASSERT_EQUAL_INT(0, rc_init2); + TEST_ASSERT_EQUAL_INT(0, rc_start2); + TEST_ASSERT_EQUAL_INT_MESSAGE(0, rc_recover, + "restart's boot replay must succeed now that the fault clears"); + TEST_ASSERT_EQUAL_INT_MESSAGE(1, restart_fault_calls, + "the fault hook must NOT fire again during restart -- it was " + "cleared, simulating the transient condition having resolved"); + + TEST_ASSERT_EQUAL_UINT64_MESSAGE(ar.marker_lsn, restart_checkpoint_lsn, + "Req 5.2: restart must resume materialization AT THE MARKER, not " + "some other position"); + TEST_ASSERT_TRUE_MESSAGE(restart_snap_exists, + "Req 5.2/5.5: restart must produce a durable checkpoint at the " + "marker's own lsn"); + TEST_ASSERT_TRUE_MESSAGE(restart_last_applied >= ar.marker_lsn, + "Req 5.2: restart must advance last_applied_lsn past the marker " + "-- materialization resumed and completed, not re-stuck"); + + TEST_ASSERT_EQUAL_INT_MESSAGE(0, verify_rc, + "Req 5.5: the restart-produced checkpoint must be structurally " + "well-formed, not a partial/corrupt write"); + TEST_ASSERT_TRUE_MESSAGE(verify_rep.ok, verify_rep.fail_reason); + TEST_ASSERT_EQUAL_UINT64(ar.marker_lsn, verify_rep.checkpoint_lsn); + + TEST_ASSERT_EQUAL_INT_MESSAGE(0, rc_recover_again, + "Req 5.3 in the crash/retry shape: a second, redundant restart " + "after materialization already succeeded must not error"); + TEST_ASSERT_EQUAL_UINT64_MESSAGE(ar.marker_lsn, + checkpoint_lsn_after_second_recover, + "a redundant restart must not relabel or move the checkpoint"); + TEST_ASSERT_EQUAL_INT_MESSAGE(1, snap_count_after_second_recover, + "a redundant restart must not duplicate the checkpoint file"); + + printf("test_marker_checkpoint_fault_hook_crash_then_restart_resumes_" + "materialization: PASS\n"); +} + +/* ── Dispatch ────────────────────────────────────────────────────────── */ + +void test_upgrade_snapshot_apply(void) +{ + UnitySetTestFile(__FILE__); + printf("\n>> config-upgrade-snapshot marker-apply-trigger tests (task 5)\n\n"); + + RUN_TEST(test_marker_apply_via_live_pump_checkpoints_at_marker_own_lsn); + RUN_TEST(test_marker_apply_fires_checkpoint_exactly_once); + RUN_TEST(test_marker_apply_retry_is_idempotent); + RUN_TEST(test_marker_apply_busy_checkpoint_handled_gracefully); + RUN_TEST(test_marker_apply_does_not_reinterpret_entities); + RUN_TEST(test_marker_apply_via_replay_checkpoints_at_marker_own_lsn); + RUN_TEST(test_marker_triggered_checkpoint_trim_preserves_standby_mid_catchup_segments); + RUN_TEST(test_marker_checkpoint_fault_hook_gates_checkpoint_call); + RUN_TEST(test_marker_checkpoint_fault_hook_crash_then_restart_resumes_materialization); +} diff --git a/src/controller/testsuite/test_upgrade_snapshot_restore.c b/src/controller/testsuite/test_upgrade_snapshot_restore.c new file mode 100644 index 0000000..5de1ba6 --- /dev/null +++ b/src/controller/testsuite/test_upgrade_snapshot_restore.c @@ -0,0 +1,361 @@ +/* + * test_upgrade_snapshot_restore.c — config-upgrade-snapshot task 3 + * + * TDD tests for restore_host_state() (Requirements 1.10, 1.11, 5.8): + * restoring a host admin-state frame must work whether or not the target + * host has ever joined this member (create-if-missing, since hosts are + * join-provisioned, not config-provisioned -- Design Invariant 1), must be + * idempotent under a retried restore (Design Invariant 3), must never + * clobber a pre-existing worker's non-admin state on a hit, and the + * placeholder it creates on a miss must be safe for the host's later real + * join (routed through rejoin_worker by join.c's own existing + * key_find-based dispatch, unmodified) to adopt -- admin status set on the + * placeholder must still be set after that real join (Design Invariant 6). + * + * RED phase: restore_host_state does not exist yet, so this file fails to + * compile/link until Task 3 adds it to worker.c + worker.h. + * + * Fixture mirrors test_worker_join.c's bare in-memory cluster_t (workermgr + + * resmgr kvmgr instances, no disk/persist) -- restore_host_state only + * touches c->workermgr directly, and the placeholder-then-real-join test + * additionally needs the resmgr resource defs that apply_join_state's + * add_hostattrs_resvals()/set_host_slots() (invoked via rejoin_worker) + * require -- same resource-name list as test_worker_join.c. + * + * collect_confvars() (required for worker.c to link without pulling in the + * full dataex.c) is intentionally NOT redefined here: test_worker_join.c + * already provides it once for the whole controller_unit_test binary. + */ + +#include + +#include +#include +#include +#include + +#include + +#include "cluster.h" +#include "kvmgr.h" +#include "resobj.h" +#include "wobj.h" +#include "worker.h" +#include "xce/cluster_def.h" +#include "xce/types.h" +#include "xstring.h" +#include "zarray.h" + +/* ── Test fixture ────────────────────────────────────────────────────── */ + +/* Resource names/types matching add_hostattrs_resvals/set_host_slots in + * worker.c -- required so a real join (rejoin_worker) after a placeholder + * restore succeeds instead of failing resource lookups. */ +#define N_RES 9 +static const char* g_res_names[N_RES] = { + "type", "model", "cpuf", "maxcpus", "maxmem", + "maxswap", "maxtmp", "ndisks", "slots" +}; +static const int g_res_valtypes[N_RES] = { + XCE_VAL_STRING, XCE_VAL_STRING, + XCE_VAL_NUMERIC, XCE_VAL_NUMERIC, XCE_VAL_NUMERIC, + XCE_VAL_NUMERIC, XCE_VAL_NUMERIC, XCE_VAL_NUMERIC, + XCE_VAL_NUMERIC +}; + +typedef struct { + cluster_t c; + var workermgr; + var resmgr; +} tur_cluster_t; + +static tur_cluster_t g_tur; + +static void tur_setup(void) +{ + kvmgr_params_t str_params = { + .key_type = KVMGR_KEY_STRING, + .nslots = 64, + .delta = 16, + .datakiller = NULL, + }; + + /* Idempotent guard: the xstring intern table is process-global and + * shared across every test file in this binary (mirrors + * test_apply_seam.c / test_replay_apply_seam.c's guard, safer than + * test_worker_join.c's unconditional call since both files run in the + * same controller_unit_test process). */ + if (makeString((char*)"tur-probe") == NULL) + xstring_table_init(139); + + memset(&g_tur, 0, sizeof(g_tur)); + + g_tur.workermgr = makeInstance(&xkvmgr_type, &str_params); + TEST_ASSERT_NOT_NULL(g_tur.workermgr); + + g_tur.resmgr = makeInstance(&xkvmgr_type, &str_params); + TEST_ASSERT_NOT_NULL(g_tur.resmgr); + + for (int i = 0; i < N_RES; i++) { + xce_resource_t rdef; + memset(&rdef, 0, sizeof(rdef)); + rdef.name = (char*)g_res_names[i]; + rdef.valtype = g_res_valtypes[i]; + rdef.flags = 0; + rdef.idx = -1; + + xce_resource_t* r = makeResource(g_tur.resmgr, &rdef); + TEST_ASSERT_NOT_NULL_MESSAGE(r, g_res_names[i]); + } + + g_tur.c.workermgr = g_tur.workermgr; + g_tur.c.resmgr = g_tur.resmgr; + zarray_init(&g_tur.c.sharedinst, 64, NULL); +} + +static void tur_teardown(void) +{ + zarray_fini(&g_tur.c.sharedinst); + if (g_tur.resmgr) dereference(g_tur.resmgr); + if (g_tur.workermgr) dereference(g_tur.workermgr); + memset(&g_tur, 0, sizeof(g_tur)); +} + +static worker_t* tur_find(const char* name) +{ + worker_t* w = NULL; + lock(g_tur.c.workermgr, RTTI_LOCK_READ); + key_find(g_tur.c.workermgr, (void*)name, (void**)&w); + unlock(g_tur.c.workermgr); + return w; +} + +/* ── Miss: create-if-missing placeholder (Req 1.10) ────────────────────── */ + +static void test_restore_host_state_creates_placeholder_for_unknown_host(void) +{ + tur_setup(); + + int rc = restore_host_state(&g_tur.c, "never-joined-host", + XCE_WORKER_CLOSED); + TEST_ASSERT_EQUAL_INT(0, rc); + + worker_t* w = tur_find("never-joined-host"); + TEST_ASSERT_NOT_NULL_MESSAGE(w, + "restore for a host with no local record must create exactly one placeholder"); + TEST_ASSERT_TRUE_MESSAGE(w->host.status & XCE_WORKER_CLOSED, + "restored admin bit (CLOSED) must be set on the placeholder"); + TEST_ASSERT_TRUE_MESSAGE(w->host.status & XCE_WORKER_UNAVAIL, + "placeholder must be unjoined/dead-until-connected"); + TEST_ASSERT_NOT_NULL_MESSAGE(w->host.attrs, + "placeholder hostattrs must be non-NULL (rejoin_worker " + "dereferences it directly on the later real join)"); + + tur_teardown(); + printf("test_restore_host_state_creates_placeholder_for_unknown_host: PASS\n"); +} + +/* ── Idempotent retry after partial failure (Req 5.8) ──────────────────── */ + +static void test_restore_host_state_retry_is_idempotent(void) +{ + tur_setup(); + + int rc1 = restore_host_state(&g_tur.c, "retry-host", XCE_WORKER_CLOSED); + TEST_ASSERT_EQUAL_INT(0, rc1); + + worker_t* w1 = tur_find("retry-host"); + TEST_ASSERT_NOT_NULL(w1); + int idx1 = w1->idx; + + /* Simulate a retried restore (e.g. after a partial earlier failure) -- + * same name/admin bits, must find-and-continue, never a duplicate + * create or an -EEXIST-style conflict. */ + int rc2 = restore_host_state(&g_tur.c, "retry-host", XCE_WORKER_CLOSED); + TEST_ASSERT_EQUAL_INT_MESSAGE(0, rc2, + "retried restore must not error"); + + worker_t* w2 = tur_find("retry-host"); + TEST_ASSERT_NOT_NULL(w2); + TEST_ASSERT_EQUAL_INT_MESSAGE(idx1, w2->idx, + "retry must reuse the same entry, never create a second one"); + TEST_ASSERT_TRUE(w2->host.status & XCE_WORKER_CLOSED); + + tur_teardown(); + printf("test_restore_host_state_retry_is_idempotent: PASS\n"); +} + +/* ── Hit on a real, already-joined worker: OR bits only (Req 1.10) ──────── */ + +static void test_restore_host_state_on_real_worker_only_ors_admin_bits(void) +{ + tur_setup(); + + hostattrs_t attrs; + memset(&attrs, 0, sizeof(attrs)); + attrs.hosttype = makeString("LINUX"); + attrs.hostmodel = makeString("x86"); + attrs.cpufactor = 1.0f; + attrs.maxcpus = 4; + attrs.maxmem = 16; + attrs.maxswap = 32; + attrs.maxtmp = 64; + attrs.ndisks = 1; + + xce_hostconfig_t hconfig; + memset(&hconfig, 0, sizeof(hconfig)); + hconfig.hosttype = (char*)"!"; + hconfig.hostmodel = (char*)"!"; + hconfig.mxj = 4; + + endpoint_t ep; + memset(&ep, 0, sizeof(ep)); + + int idx = init_worker(&g_tur.c, &ep, "real-host-1", &attrs, &hconfig); + TEST_ASSERT_GREATER_OR_EQUAL(0, idx); + + worker_t* w = tur_find("real-host-1"); + TEST_ASSERT_NOT_NULL(w); + TEST_ASSERT_FALSE(w->host.status & XCE_WORKER_UNAVAIL); + TEST_ASSERT_EQUAL_PTR(&ep, w->ep); + + int rc = restore_host_state(&g_tur.c, "real-host-1", XCE_WORKER_CLOSED); + TEST_ASSERT_EQUAL_INT(0, rc); + + TEST_ASSERT_TRUE_MESSAGE(w->host.status & XCE_WORKER_CLOSED, + "admin bit must be OR'd onto the real worker"); + TEST_ASSERT_FALSE_MESSAGE(w->host.status & XCE_WORKER_UNAVAIL, + "restore on a real, already-joined worker must not mark it UNAVAIL"); + TEST_ASSERT_EQUAL_STRING_MESSAGE("LINUX", w->host.attrs->hosttype, + "restore on a hit must not touch existing attrs"); + TEST_ASSERT_EQUAL_PTR_MESSAGE(&ep, w->ep, + "restore on a hit must not touch ep"); + + tur_teardown(); + printf("test_restore_host_state_on_real_worker_only_ors_admin_bits: PASS\n"); +} + +/* ── Observable (task 3's own line): placeholder -> later real join ────── */ + +static void +test_restore_host_state_placeholder_then_real_join_preserves_admin_status(void) +{ + tur_setup(); + + /* Host admin-closed while down, then a configuration upgrade restores + * its admin-state frame on a member with no local record of the host's + * join -- must create a placeholder carrying the CLOSED bit. */ + int rc = restore_host_state(&g_tur.c, "join-later-host", + XCE_WORKER_CLOSED); + TEST_ASSERT_EQUAL_INT(0, rc); + + worker_t* w = tur_find("join-later-host"); + TEST_ASSERT_NOT_NULL(w); + TEST_ASSERT_TRUE(w->host.status & XCE_WORKER_CLOSED); + TEST_ASSERT_TRUE(w->host.status & XCE_WORKER_UNAVAIL); + + /* The host's real first join. join.c's own dispatch (join.c:90-103) + * does exactly: key_find() -> found w != NULL -> rejoin_worker() (never + * init_worker()). Reproduced directly here (rather than going through + * handle_worker_join) since that needs a live xce_request_t/endpoint_t/ + * persist commit-barrier harness this unit test intentionally has none + * of -- the dispatch decision itself is not under test, join.c's is + * unmodified and already covered elsewhere; what's under test is that + * THIS placeholder is a valid, non-crashing input to rejoin_worker(). */ + hostattrs_t new_attrs; + memset(&new_attrs, 0, sizeof(new_attrs)); + new_attrs.hosttype = makeString("LINUX"); + new_attrs.hostmodel = makeString("x86_64"); + new_attrs.cpufactor = 1.0f; + new_attrs.maxcpus = 8; + new_attrs.maxmem = 32; + new_attrs.maxswap = 64; + new_attrs.maxtmp = 128; + new_attrs.ndisks = 2; + + xce_hostconfig_t hconfig; + memset(&hconfig, 0, sizeof(hconfig)); + hconfig.hosttype = (char*)"!"; + hconfig.hostmodel = (char*)"!"; + hconfig.mxj = 4; + + endpoint_t ep; + memset(&ep, 0, sizeof(ep)); + + worker_t* found = NULL; + int findrc = 0; + lock(g_tur.c.workermgr, RTTI_LOCK_READ); + findrc = key_find(g_tur.c.workermgr, (void*)"join-later-host", + (void**)&found); + unlock(g_tur.c.workermgr); + TEST_ASSERT_GREATER_THAN_MESSAGE(-1, findrc, + "join.c's dispatch must find the placeholder (hit, not miss)"); + TEST_ASSERT_EQUAL_PTR(w, found); + + int idx = rejoin_worker(&g_tur.c, found, &ep, &new_attrs, &hconfig); + TEST_ASSERT_GREATER_OR_EQUAL_MESSAGE(0, idx, + "rejoin_worker must not fail on the placeholder"); + + TEST_ASSERT_TRUE_MESSAGE(w->host.status & XCE_WORKER_CLOSED, + "admin status set via restore must still be set after the real join"); + TEST_ASSERT_FALSE_MESSAGE(w->host.status & XCE_WORKER_UNAVAIL, + "the real join must clear UNAVAIL"); + TEST_ASSERT_EQUAL_STRING("LINUX", w->host.attrs->hosttype); + + dereference(new_attrs.hosttype); + dereference(new_attrs.hostmodel); + + tur_teardown(); + printf("test_restore_host_state_placeholder_then_real_join_preserves_admin_status: PASS\n"); +} + +/* ── Defense-in-depth: non-admin bits are masked out ────────────────────── */ + +static void test_restore_host_state_masks_non_admin_bits(void) +{ + tur_setup(); + + int rc = restore_host_state(&g_tur.c, "masked-host", + XCE_WORKER_CLOSED | XCE_WORKER_BUSY); + TEST_ASSERT_EQUAL_INT(0, rc); + + worker_t* w = tur_find("masked-host"); + TEST_ASSERT_NOT_NULL(w); + TEST_ASSERT_TRUE_MESSAGE(w->host.status & XCE_WORKER_CLOSED, + "admin bit must be applied"); + TEST_ASSERT_FALSE_MESSAGE(w->host.status & XCE_WORKER_BUSY, + "non-admin bit must be masked out even if a caller passes it"); + + tur_teardown(); + printf("test_restore_host_state_masks_non_admin_bits: PASS\n"); +} + +/* ── Input validation at the boundary ───────────────────────────────────── */ + +static void test_restore_host_state_rejects_empty_name(void) +{ + tur_setup(); + + TEST_ASSERT_EQUAL_INT(-EINVAL, + restore_host_state(&g_tur.c, NULL, XCE_WORKER_CLOSED)); + TEST_ASSERT_EQUAL_INT(-EINVAL, + restore_host_state(&g_tur.c, "", XCE_WORKER_CLOSED)); + + tur_teardown(); + printf("test_restore_host_state_rejects_empty_name: PASS\n"); +} + +/* ── Dispatch ───────────────────────────────────────────────────────── */ + +void test_upgrade_snapshot_restore(void) +{ + UnitySetTestFile(__FILE__); + printf("\n>> config-upgrade-snapshot host restore tests (task 3)\n\n"); + + RUN_TEST(test_restore_host_state_creates_placeholder_for_unknown_host); + RUN_TEST(test_restore_host_state_retry_is_idempotent); + RUN_TEST(test_restore_host_state_on_real_worker_only_ors_admin_bits); + RUN_TEST(test_restore_host_state_placeholder_then_real_join_preserves_admin_status); + RUN_TEST(test_restore_host_state_masks_non_admin_bits); + RUN_TEST(test_restore_host_state_rejects_empty_name); +} diff --git a/src/controller/testsuite/test_waldump.c b/src/controller/testsuite/test_waldump.c index cdbc51a..ff5c9d7 100644 --- a/src/controller/testsuite/test_waldump.c +++ b/src/controller/testsuite/test_waldump.c @@ -2,6 +2,8 @@ #include #include #include +#include +#include #include #include @@ -152,6 +154,135 @@ static void test_missing_prefix_flagged_as_gap(void) TEST_ASSERT_EQUAL_UINT64(13, st.first_lsn); /* prefix [1..12] absent → exactly one gap */ TEST_ASSERT_EQUAL_UINT(1, st.n_gaps); + /* g_dir has no sibling data/snap/ at all → nothing can explain it */ + TEST_ASSERT_EQUAL_INT(0, st.leading_gap_explained); +} + +/* ------------------------------------------------------------------ */ +/* WAL_CONFIG_MARKER must decode as its own named type, not fall into */ +/* the generic UNKNOWN bucket (a real, defined type — wal_types.h). */ +/* ------------------------------------------------------------------ */ +static void test_config_marker_type_decoded(void) +{ + fresh_dir(); + char path[512]; + FILE* fp = fopen(seg_path(1, path, sizeof(path)), "wb"); + TEST_ASSERT_NOT_NULL(fp); + + uint32_t last = WAL_CRC_NONE; + put_entry(fp, 0, 1, WAL_NOOP, NULL, 0, &last, 1); + + uint8_t marker[WAL_CONFIG_MARKER_PAYLOAD_LEN]; + uint64_t tag = 0x1122334455667788ULL; + for (int i = 0; i < 8; i++) + marker[i] = (uint8_t)(tag >> (56 - i * 8)); + memset(marker + 8, 0xab, 32); + put_entry(fp, 3, 2, WAL_CONFIG_MARKER, marker, sizeof(marker), &last, 0); + fclose(fp); + + char* buf = NULL; + size_t bufsz = 0; + FILE* mem = open_memstream(&buf, &bufsz); + TEST_ASSERT_NOT_NULL(mem); + + waldump_stats_t st; + int rc = waldump_path(g_dir, mem, &st); + fclose(mem); + + TEST_ASSERT_EQUAL_INT(0, rc); + TEST_ASSERT_NOT_NULL(strstr(buf, "CONFIG_MARKER")); + TEST_ASSERT_NULL(strstr(buf, "UNKNOWN")); + TEST_ASSERT_NOT_NULL(strstr(buf, "tag=1122334455667788")); + free(buf); +} + +/* ------------------------------------------------------------------ */ +/* A leading gap covered by a sibling data/snap/ snapshot is normal, */ +/* checkpoint-triggered WAL trim — waldump must say so, not alarm. */ +/* ------------------------------------------------------------------ */ +static void test_leading_gap_explained_by_covering_snapshot(void) +{ + fresh_dir(); + char wal_dir[300], snap_dir[300]; + snprintf(wal_dir, sizeof(wal_dir), "%s/data/wal", g_dir); + snprintf(snap_dir, sizeof(snap_dir), "%s/data/snap", g_dir); + char data_dir[300]; + snprintf(data_dir, sizeof(data_dir), "%s/data", g_dir); + TEST_ASSERT_EQUAL_INT(0, mkdir(data_dir, 0755)); + TEST_ASSERT_EQUAL_INT(0, mkdir(wal_dir, 0755)); + TEST_ASSERT_EQUAL_INT(0, mkdir(snap_dir, 0755)); + + /* Snapshot at LSN 12 covers the trimmed prefix [1..12] below. */ + char snap_file[400]; + snprintf(snap_file, sizeof(snap_file), "%s/snap-%016x.capnp", snap_dir, + 0xc); + FILE* sf = fopen(snap_file, "wb"); + TEST_ASSERT_NOT_NULL(sf); + fclose(sf); + + char segp[400]; + snprintf(segp, sizeof(segp), "%s/seg-%016lx.wal", wal_dir, + (unsigned long)13); + FILE* fp = fopen(segp, "wb"); + TEST_ASSERT_NOT_NULL(fp); + uint32_t last = WAL_CRC_NONE; + put_entry(fp, 0, 13, WAL_NOOP, NULL, 0, &last, 1); + fclose(fp); + + char* buf = NULL; + size_t bufsz = 0; + FILE* mem = open_memstream(&buf, &bufsz); + TEST_ASSERT_NOT_NULL(mem); + + waldump_stats_t st; + int rc = waldump_path(g_dir, mem, &st); + fclose(mem); + + TEST_ASSERT_EQUAL_INT(0, rc); + TEST_ASSERT_EQUAL_UINT(1, st.n_gaps); + TEST_ASSERT_NOT_EQUAL(0, st.leading_gap_explained); + TEST_ASSERT_NOT_NULL(strstr(buf, "covered by snapshot")); + TEST_ASSERT_NULL(strstr(buf, "committed prefix missing!")); + free(buf); +} + +/* ------------------------------------------------------------------ */ +/* A snapshot that does NOT cover the full gap must NOT explain it — */ +/* the alarming wording stays, since the gap could still be real loss. */ +/* ------------------------------------------------------------------ */ +static void test_leading_gap_not_explained_by_insufficient_snapshot(void) +{ + fresh_dir(); + char wal_dir[300], snap_dir[300], data_dir[300]; + snprintf(data_dir, sizeof(data_dir), "%s/data", g_dir); + snprintf(wal_dir, sizeof(wal_dir), "%s/data/wal", g_dir); + snprintf(snap_dir, sizeof(snap_dir), "%s/data/snap", g_dir); + TEST_ASSERT_EQUAL_INT(0, mkdir(data_dir, 0755)); + TEST_ASSERT_EQUAL_INT(0, mkdir(wal_dir, 0755)); + TEST_ASSERT_EQUAL_INT(0, mkdir(snap_dir, 0755)); + + /* Snapshot at LSN 5 does NOT cover the trimmed prefix [1..12] below. */ + char snap_file[400]; + snprintf(snap_file, sizeof(snap_file), "%s/snap-%016x.capnp", snap_dir, + 0x5); + FILE* sf = fopen(snap_file, "wb"); + TEST_ASSERT_NOT_NULL(sf); + fclose(sf); + + char segp[400]; + snprintf(segp, sizeof(segp), "%s/seg-%016lx.wal", wal_dir, + (unsigned long)13); + FILE* fp = fopen(segp, "wb"); + TEST_ASSERT_NOT_NULL(fp); + uint32_t last = WAL_CRC_NONE; + put_entry(fp, 0, 13, WAL_NOOP, NULL, 0, &last, 1); + fclose(fp); + + waldump_stats_t st; + int rc = waldump_path(g_dir, stdout, &st); + TEST_ASSERT_EQUAL_INT(0, rc); + TEST_ASSERT_EQUAL_UINT(1, st.n_gaps); + TEST_ASSERT_EQUAL_INT(0, st.leading_gap_explained); } /* ------------------------------------------------------------------ */ @@ -288,6 +419,9 @@ void test_waldump(void) UnitySetTestFile(__FILE__); RUN_TEST(test_contiguous_log_has_no_gaps); RUN_TEST(test_missing_prefix_flagged_as_gap); + RUN_TEST(test_config_marker_type_decoded); + RUN_TEST(test_leading_gap_explained_by_covering_snapshot); + RUN_TEST(test_leading_gap_not_explained_by_insufficient_snapshot); RUN_TEST(test_duplicate_submit_detection); RUN_TEST(test_interior_gap_flagged); RUN_TEST(test_crc_break_sets_recovered_tip); diff --git a/src/controller/testsuite/waldump.c b/src/controller/testsuite/waldump.c index 32d5929..4c8752f 100644 --- a/src/controller/testsuite/waldump.c +++ b/src/controller/testsuite/waldump.c @@ -46,6 +46,7 @@ static const char* wal_type_name(uint32_t t) case WAL_QUEUE_CTRL: return "QUEUE_CTRL"; case WAL_WORKER_CTRL: return "WORKER_CTRL"; case WAL_NOOP: return "NOOP"; + case WAL_CONFIG_MARKER: return "CONFIG_MARKER"; case WAL_CHECKPOINT: return "CHECKPOINT"; default: return "UNKNOWN"; } @@ -127,6 +128,63 @@ static int decode_jobstate_info(const uint8_t* payload, uint32_t len, return 0; } +/* Decode a WAL_CONFIG_MARKER payload -- fixed 40-byte form (8-byte + * big-endian version_tag + 32-byte raw sha256), never capnp-encoded + * (config_repl.c's config_marker_encode/config_marker_decode). Hand-decoded + * here rather than linking config_repl.c, which would pull controller- + * internal dependencies into xce_test's link graph (meson.build's + * xce_test_src is deliberately limited to read-only dump/compare tools). + * Mirrors config_marker_decode's byte layout exactly. */ +static int decode_config_marker_info(const uint8_t* payload, uint32_t len, + uint64_t* out_tag, uint8_t sha256_out[32]) +{ + if (!payload || len < WAL_CONFIG_MARKER_PAYLOAD_LEN) + return -1; + uint64_t tag = 0; + for (int i = 0; i < 8; i++) + tag = (tag << 8) | payload[i]; + *out_tag = tag; + memcpy(sha256_out, payload + 8, 32); + return 0; +} + +/* Highest LSN among sibling data/snap/snap-.capnp files next to + * `wal_dir` (persist.c hardcodes both as siblings under a node's data/, + * e.g. .../data/wal and .../data/snap). A leading WAL gap up to this LSN is + * explained by normal checkpoint-triggered trim (persist.c's + * trim_wal_segments only removes segments below a replication-safe floor, + * never a segment a standby still needs to catch up) rather than genuine + * loss -- without this check, EVERY long-running node's WAL (which will + * have been checkpointed at least once) prints the same alarming + * "(committed prefix missing!)" wording a real, unexplained loss would, + * making the message a standing false alarm. Returns 0 if `wal_dir` isn't + * named "wal", or no sibling snap dir/files exist (unknown -- callers keep + * today's un-downgraded wording, the conservative default). */ +static uint64_t highest_snapshot_lsn(const char* wal_dir) +{ + char snap_dir[4096]; + snprintf(snap_dir, sizeof(snap_dir), "%s", wal_dir); + char* slash = strrchr(snap_dir, '/'); + if (!slash || strcmp(slash + 1, "wal") != 0) + return 0; + snprintf(slash + 1, sizeof(snap_dir) - (size_t)(slash + 1 - snap_dir), + "snap"); + + DIR* d = opendir(snap_dir); + if (!d) + return 0; + uint64_t max_lsn = 0; + struct dirent* e; + while ((e = readdir(d)) != NULL) { + uint64_t lsn; + if (sscanf(e->d_name, "snap-%" SCNx64 ".capnp", &lsn) == 1 && + lsn > max_lsn) + max_lsn = lsn; + } + closedir(d); + return max_lsn; +} + /* True if `dir` directly contains at least one seg-*.wal file. */ static int dir_has_segments(const char* dir) { @@ -241,7 +299,7 @@ static int collect_segments(const char* wal_dir, uint64_t* seg_lsns, int max) static void scan_segment(const char* seg_path, FILE* out, uint32_t* last_crc, uint64_t* prev_lsn, uint64_t* prev_submit_jobid, uint32_t* prev_submit_pcrc, - waldump_stats_t* st, + waldump_stats_t* st, uint64_t snap_lsn, waldump_visit_fn visit, void* visit_ctx, int* visit_stop) { @@ -309,10 +367,15 @@ static void scan_segment(const char* seg_path, FILE* out, /* Gap detection against the running LSN sequence. */ if (*prev_lsn == 0) { if (hdr.lsn > 1) { + int explained = snap_lsn >= hdr.lsn - 1; fprintf(out, " *** GAP: missing prefix LSN 1..%" PRIu64 - " (%" PRIu64 " entries absent) ***\n", - hdr.lsn - 1, hdr.lsn - 1); + " (%" PRIu64 " entries absent)%s ***\n", + hdr.lsn - 1, hdr.lsn - 1, + explained ? " -- covered by snapshot, expected " + "post-checkpoint trim" + : ""); st->n_gaps++; + st->leading_gap_explained = explained; } } else if (hdr.lsn > *prev_lsn + 1) { fprintf(out, " *** GAP: missing LSN %" PRIu64 "..%" PRIu64 " ***\n", @@ -404,6 +467,20 @@ static void scan_segment(const char* seg_path, FILE* out, } /* a non-submit entry breaks the adjacency for dup detection */ *prev_submit_jobid = 0; + } else if (hdr.type == WAL_CONFIG_MARKER) { + uint64_t tag = 0; + uint8_t sha[32]; + if (decode_config_marker_info(payload, hdr.payload_len, &tag, + sha) == 0) { + char hex[65]; + for (int i = 0; i < 32; i++) + snprintf(hex + i * 2, 3, "%02x", sha[i]); + snprintf(info, sizeof(info), "tag=%016" PRIx64 " sha256=%s", + tag, hex); + } else { + snprintf(info, sizeof(info), "tag=?"); + } + *prev_submit_jobid = 0; } else { /* a non-submit entry breaks the adjacency for dup detection */ *prev_submit_jobid = 0; @@ -505,6 +582,7 @@ int waldump_path_visit(const char* path, FILE* out, waldump_stats_t* stats, } st.n_segments = (uint32_t)nseg; + uint64_t snap_lsn = highest_snapshot_lsn(wal_dir); fprintf(out, "== WAL: %s (%d segment%s) ==\n", wal_dir, nseg, nseg == 1 ? "" : "s"); @@ -521,7 +599,7 @@ int waldump_path_visit(const char* path, FILE* out, waldump_stats_t* stats, snprintf(seg_path, sizeof(seg_path), WAL_SEG_FMT, wal_dir, seg_lsns[i]); scan_segment(seg_path, out, &last_crc, &prev_lsn, - &prev_submit_jobid, &prev_submit_pcrc, &st, + &prev_submit_jobid, &prev_submit_pcrc, &st, snap_lsn, visit, ctx, &visit_stop); } @@ -532,7 +610,11 @@ int waldump_path_visit(const char* path, FILE* out, waldump_stats_t* stats, " recovered tip: %" PRIu64 "\n", st.first_lsn, st.last_lsn, st.recovered_tip); fprintf(out, " gaps: %u%s crc chain: %s\n", st.n_gaps, - (st.n_gaps && st.first_lsn > 1) ? " (committed prefix missing!)" : "", + (st.n_gaps && st.first_lsn > 1) + ? (st.leading_gap_explained + ? " (explained by checkpoint/snapshot -- not a loss)" + : " (committed prefix missing!)") + : "", st.crc_broken ? "BROKEN" : "intact"); if (st.n_dup_submits > 0) fprintf(out, " duplicate submits: %u (byte-identical: %u) — bug-845\n", diff --git a/src/controller/testsuite/waldump.h b/src/controller/testsuite/waldump.h index 2a34b37..4a61b41 100644 --- a/src/controller/testsuite/waldump.h +++ b/src/controller/testsuite/waldump.h @@ -29,6 +29,13 @@ typedef struct { uint32_t n_dup_identical; /* of n_dup_submits, those whose payload is * byte-identical to the prior entry */ int crc_broken; /* nonzero if a CRC/chain break truncated a segment */ + int leading_gap_explained; /* nonzero if the leading (prefix) gap's + * upper LSN is covered by a sibling + * data/snap/snap-.capnp file — i.e. + * normal checkpoint-triggered WAL trim + * (persist.c trim_wal_segments), not + * genuine loss. 0 if there was no leading + * gap, or no covering snapshot was found. */ } waldump_stats_t; /* One physically-present, CRC-valid WAL entry, surfaced to a visitor so a diff --git a/src/controller/worker.c b/src/controller/worker.c index dc30c57..e0c4e3d 100644 --- a/src/controller/worker.c +++ b/src/controller/worker.c @@ -436,6 +436,105 @@ int restore_worker(void* cls, xce_worker_t host) return idx; } +/* + * restore_host_state — restore a host admin-state frame (config-upgrade- + * snapshot Requirements 1.10, 1.11, 5.8). + * + * Unlike restore_queue_state() (queues are config-provisioned, so an + * update-only lookup is always safe), a worker_t is join-provisioned: it + * may not exist yet on a member that hasn't locally replayed this host's + * original join record (e.g. one that received the upgrade snapshot via + * the out-of-band install path). So this restore path is create-if-missing: + * + * - Hit (host already registered -- a real joined worker, or an earlier + * placeholder left by a prior restore attempt): OR the restored admin + * bits into the existing status only. Nothing else is touched, so a + * real worker's live attrs/ep/resource values survive untouched. + * - Miss: create a minimal placeholder via makeWorker(), mirroring the + * synthetic lost_and_found sentinel host precedent exactly + * (config_repl.c:1114-1130) -- the same "makeWorker() without a join" + * mechanism, not a new one. The placeholder is marked + * XCE_WORKER_UNAVAIL (unjoined, dead-until-connected) and carries the + * restored admin bits. Its hostattrs_t is non-NULL with valid sentinel + * strings (copy_worker, wobj.c:53, requires non-NULL attrs; downstream + * apply_join_state()/add_hostattrs_resvals() treat hosttype/hostmodel + * as always-valid strings) so the host's later real join -- which + * join.c routes to rejoin_worker(), unmodified, because key_find() now + * finds this placeholder -- doesn't crash on rejoin_worker's direct + * attrs->hosttype dereference (worker.c:376-379). + * + * Idempotent under retry (5.8): find first via our own key_find, create + * only if truly missing. A second call for the same host (e.g. a retried + * restore after an earlier attempt failed partway through the snapshot) + * finds either the real worker or the already-created placeholder and just + * OR's the bits in again -- never a duplicate-create conflict. + * + * admin_status is masked to XCE_WORKER_ADMIN_MASK defensively (mirrors the + * collect side's own discipline, collect_host_frames only ever encoding + * admin-masked bits) so a caller passing an unmasked status word can never + * leak a non-admin bit (e.g. XCE_WORKER_BUSY) onto the restored host. + */ +int restore_host_state(cluster_t* c, const char* name, uint32_t admin_status) +{ + worker_t* w = NULL; + int rc = 0; + + if (name == NULL || name[0] == '\0') + return -EINVAL; + if (c == NULL || c->workermgr == NULL) + return -EINVAL; + + admin_status &= XCE_WORKER_ADMIN_MASK; + + /* No reference() pin across the workermgr-unlock/w-lock gap (unlike + * join.c's live-join path): this is called from checkpoint restore + * (ha_handle_snapshot_chunk -> persist_load_snapshot), which DOES run + * on the live vtask pool, not a quiesced phase, so a real first-time + * join for the same host CAN race this call. That race is still safe: + * a concurrent init_worker/makeWorker on a miss here would itself + * find-or-create via the same key_find/makeWorker machinery under + * workermgr's own lock, and either ordering converges to a worker + * with the admin bits OR'd in and UNAVAIL cleared by the real join's + * own apply_join_state() call -- the same "outer key_find, then + * unconditionally call into makeWorker" shape already used elsewhere + * in this codebase (worker_from_capnp/restore_worker, + * create_lost_and_found). Mirrors restore_queue_state's (queue.c:208) + * lock idiom, not a claim that this path is concurrency-free. */ + lock(c->workermgr, RTTI_LOCK_READ); + rc = key_find(c->workermgr, (void*)name, (void**)&w); + unlock(c->workermgr); + + if (rc < 0 && rc != -ENOENT) + return rc; + + if (w != NULL) { + /* Hit: real joined worker or an earlier placeholder -- only OR the + * admin bits in, never touch anything else. */ + lock(w, RTTI_LOCK_WRITE); + w->host.status |= admin_status; + unlock(w); + + return 0; + } + + /* Miss: create a minimal, valid placeholder -- mirrors the + * lost_and_found sentinel host precedent (config_repl.c:1114-1130). */ + { + hostattrs_t placeholder_attrs = { .hosttype = "unknown", + .hostmodel = "unknown" }; + xce_worker_t placeholder_host = { .name = (char*)name, + .attrs = &placeholder_attrs, + .status = XCE_WORKER_UNAVAIL + | admin_status }; + + w = makeWorker(c->workermgr, &placeholder_host); + if (w == NULL) + return -errno; + } + + return 0; +} + struct worker_config_publish_args { cluster_t* c; endpoint_t* ep; @@ -724,12 +823,37 @@ int do_hostcontrol_op(cluster_t* c, endpoint_t* ep, xce_request_t* request) /* Reconstruct a worker from a WAL_WORKER_CTRL Cap'n Proto payload. * Payload layout: [uint32_t detail][Cap'n Proto xce_worker_t]. - * Returns -EEXIST if the worker is already registered (idempotent replay). */ + * + * If the worker is already registered: + * - HOOK_DETAIL_WORKER_JOIN: a duplicate JOIN replay is genuinely a + * no-op -- returns -EEXIST, no mutation (unchanged, pre-bug-1472 + * behavior). + * - HOOK_DETAIL_WORKER_UPDATE: the target already existing is the + * NORMAL case (worker_ctrl()'s HOST_OPEN/HOST_CLOSE, worker.c:732-794, + * only ever runs against an already-joined host). bug-1472: replace + * (not OR -- worker_ctrl uses assignment-style clear/set, so a + * HOST_OPEN must be able to CLEAR the closed bits) the existing + * worker's admin-masked status bits with the decoded payload's, then + * return 0 so the caller (persist.c's WAL_WORKER_CTRL apply case) + * falls through to fire the HOOK_DETAIL_WORKER_UPDATE notification + * instead of silently discarding the change. + * - HOOK_DETAIL_WORKER_DEAD: left as -EEXIST (unchanged) -- see + * buglog.json bug-1472 for why DEAD's replication needs its own, + * separately-tracked fix: its mutation isn't confined to + * XCE_WORKER_ADMIN_MASK (XCE_WORKER_UNAVAIL + dead_since + hostattrs + * reset), and the live per-host resource-value array + * (xce_worker_t.resvals, a zarray_t) that mark_worker_unavail() + * zeroes via set_host_slots() never round-trips through the Worker + * capnp schema at all (only resvals_to_sched does) -- a naive + * status-replace here would be an incomplete fix. */ int worker_from_capnp(cluster_t* c, const void* capnp_payload, size_t len) { if (!capnp_payload || len <= sizeof(uint32_t)) return -EINVAL; + uint32_t hook_detail; + memcpy(&hook_detail, capnp_payload, sizeof(hook_detail)); + /* Skip the 4-byte detail discriminator written by persist_worker_hook_fun */ const uint8_t* data = (const uint8_t*)capnp_payload + sizeof(uint32_t); size_t data_len = len - sizeof(uint32_t); @@ -745,13 +869,27 @@ int worker_from_capnp(cluster_t* c, const void* capnp_payload, size_t len) decode_Worker(&host, &cw); capn_free(&c_ctx); - /* Idempotency guard: skip if already present */ + /* Idempotency guard: an existing worker means either a duplicate JOIN + * replay (no-op) or an UPDATE targeting an already-joined host (the + * normal case -- must be applied, see bug-1472). */ worker_t* existing = NULL; lock(c->workermgr, RTTI_LOCK_READ); int found = key_find(c->workermgr, (void*)host.name, (void**)&existing); unlock(c->workermgr); - if (found > 0 && existing != NULL) + if (found > 0 && existing != NULL) { + if (hook_detail == HOOK_DETAIL_WORKER_UPDATE) { + lock(existing, RTTI_LOCK_WRITE); + existing->host.status + = (existing->host.status & ~XCE_WORKER_ADMIN_MASK) + | (host.status & XCE_WORKER_ADMIN_MASK); + unlock(existing); + + free_Worker(&host); + return 0; + } + return -EEXIST; + } return restore_worker(c, host); } diff --git a/src/docs/deployment.md b/src/docs/deployment.md new file mode 100644 index 0000000..82f3b8d --- /dev/null +++ b/src/docs/deployment.md @@ -0,0 +1,255 @@ +# XCE Deployment Guide + +Covers building and running all four daemons (controller, worker, scheduler, apiserver) and using `xceadmin` to author and push cluster configuration. Local dev/test deployment is fully automated; production process supervision (systemd/Docker/etc.) is **not** shipped in this repo — see [Production Gaps](#production-gaps) before treating anything here as a production runbook. + +## Component Overview + +``` +xceadmin (Python CLI) --config push (TLS)--> controller (C, HA cluster, 1..N nodes) + ^ ^ + plaintext join | | plaintext join + | | + worker (C) scheduler (C) + ^ + CGO-linked libxce client (TCP, HA-aware) + | + apiserver (Go, REST) <-- xcecli (Go CLI, REST) +``` + +- **controller** (`xce_controller`) — the only stateful daemon. Runs as 1 or 3+ nodes for HA (Raft-style election + replication). All other components are its clients. +- **worker** (`xcecd`) — one per compute host, runs jobs, joins a controller. +- **scheduler** (`xce_scheduler`) — job-to-node placement engine, joins a controller. +- **apiserver** (`xce_apiserver`) — Go REST API, joins the controller cluster as a client role (`HostRole_apiserver`) via a CGO-linked `libxce` client, not a plain HTTP backend call. +- **xcecli** — Go CLI, talks to `apiserver` over REST, never touches the controller directly. +- **xceadmin** — Python CLI, the only tool that compiles and pushes *cluster configuration* (`cluster.bin`) to the controller. Separate concern from the four daemons above. + +Only controller↔controller HA replication traffic is TLS. Worker→controller, scheduler→controller, and apiserver→controller traffic is **plaintext**. + +## Building + +```bash +# Dev loop, per component (debug + ASAN, runs tests) +/xce-build controller +/xce-build worker +/xce-build scheduler +/xce-build apiserver +/xce-build xceadmin +/xce-build # all components + +# Profiles: /xce-build [component] [profile] +# asan (default) -> xce.build/ debug+ASAN, runs tests +# debug -> build.dbg/ -O0 -g3, no sanitizer, gdb-friendly +# release -> build.release/ -O3, no sanitizer, build-only + +# Production (Nix) +nix build .#xcecore # controller + worker + scheduler + apiserver + xceadmin + AppImage, one derivation +nix build .#xcecore_debug # same, debug + ASAN (this flake's default package) +nix build .#xcecli # xcecli only (separate Go-only derivation) +``` + +`nix build .#xcecore` is all-or-nothing — there is no per-daemon Nix target. It produces one `result/bin/` containing `xce_controller`, `xcecd` (+ `xcecd_worker`, `xcecd_virtual`), `xce_scheduler`, `xce_apiserver`, the `xceadmin` venv wrapper, and `xce` (the AppImage dispatcher script, see below). `nix build .#xcecli` is the one genuinely separate target. + +**AppImage** (`xce-x86_64.AppImage`, from `nix build .#xcecore`) wraps `src/tools/appimage/entry.sh`, a thin per-daemon dispatcher — it runs exactly **one** daemon per invocation, never the whole stack: +```bash +./xce-x86_64.AppImage controller --myname ctrl-1 --peers "ctrl-1=h1:9990,ctrl-2=h2:9990,ctrl-3=h3:9990" ... +./xce-x86_64.AppImage worker -c /etc/xce/worker.yaml +./xce-x86_64.AppImage scheduler --peers node1=h1:9990 +./xce-x86_64.AppImage apiserver -d /opt/xce/apiserver +./xce-x86_64.AppImage shell # interactive bash with all binaries + haproxy/glow/less on PATH +``` +Run it once per daemon (likely on different hosts) to stand up a cluster. + +## xceadmin — Cluster Configuration + +`xceadmin` is the only supported way to turn operator-authored YAML into the `cluster.bin` binary the controller loads, and to push it to a running cluster. It speaks the same raw TLS + Cap'n Proto wire protocol controllers use with each other (no client certificate — `verify_mode=ssl.CERT_NONE`, matching the controller's own outbound posture). + +### Install + +```bash +# Dev, editable, fast iteration (must run inside `nix develop ./src`) +cd src/xceadmin && pip install -e . + +# Production / CI (what /xce-build and `nix build .#xcecore` actually use) +/xce-build xceadmin +``` +`/xce-build xceadmin` always does a clean, non-editable `pip install` into an out-of-tree venv (`--system-site-packages`, inheriting nix-provided `pycapnp`/`pyyaml`/`jsonschema`), runs the full pytest suite, syncs the bundled schemas fresh from `src/schema/`, and produces a standalone `xceadmin` wrapper script — this is what ships in the AppImage and `nix build` output. + +**This venv only works from inside `nix develop ./src` (or the AppImage's bundled env) — it is not a portable, standalone venv.** `--system-site-packages` means `pip install` sees `click`/`pycapnp`/`pyyaml`/`jsonschema` already satisfied by nix's site-packages and skips vendoring its own copies — deliberately, since `pycapnp` is ABI-sensitive to the exact `capnproto` C library version, and letting pip resolve/build its own would risk a version mismatch that crashes at runtime. If you `source .venv/bin/activate` (or run the `xceadmin` binary directly) outside `nix develop`, none of those packages are on `sys.path` and you'll hit `ModuleNotFoundError: No module named 'click'` (or similar) immediately. Either stay inside `nix develop ./src` when invoking the built `xceadmin`, or use the AppImage, which bundles a working environment on `PATH` already. + +### Usage + +```bash +# Compile YAML config into a binary, print its SHA-256 to stderr +xceadmin config build /path/to/configs -o cluster.bin +xceadmin config build /path/to/configs -o - # to stdout instead of a file + +# Push a compiled config to a running controller (any node — primary or standby; redirects to primary automatically, up to 3 hops) +xceadmin config push cluster.bin --controller 127.0.0.1:9991 # host:port; defaults to localhost:9991 + +# Check whether the controller would accept it, without committing +xceadmin config push --dry-run cluster.bin --controller 127.0.0.1:9991 +``` + +`config build` reads a fixed set of source files from the given directory — `xce.yaml`, `hosts.yaml`, `queues.yaml`, `resources.yaml`, `users.yaml`, `limits.yaml`, `scaler.yaml` (a missing file → empty section, not an error) — validates each against a bundled JSON schema, runs hard-fail business checks (reserved names, duplicates) and warn-only checks (undefined cross-references), then maps everything into a `ClusterConfig` Cap'n Proto message. Building twice from identical input is byte-for-byte deterministic (no wall-clock/hostname ever read). Fields that are **never** settable from YAML: `port`, hash-table-size tuning, `xstrings`, `candidates` (peer membership), `configGeneration` (controller-assigned). + +`config push` exits non-zero unless the controller's reply reports `ackedCount > 0` and no error string; `--dry-run` exits non-zero on any rejection reason the controller returns. + +### Known limitations (as of this writing) + +- **`config push` against a real controller fails with a client-side decode crash**, live-verified against a freshly deployed single-node controller: the controller's `OPCode_upgradeConfig` dispatch is fine — `CONF_ENABLE_UPGRADE_CONFIG` defaults on, the earlier dispatch-gate polarity bug (bug-1468) was already fixed 2026-07-25, and the controller log shows the push genuinely committed, activated, and hash-verified server-side. The bug is in `xceadmin` itself: `xce_reply()` (`src/lib/request.c`) wraps every reply — including the upgradeConfig reply — in an outer `Request{opcode: OPCode_reply, body.replymsg: RequestReply{...}}` envelope, but `discovery.py`'s `_redirect_target()` decodes the raw wire bytes directly as a bare `RequestReply`, skipping the outer envelope. The resulting pointer-offset misalignment throws `capnp.lib.capnp.KjException: ... non-list pointer where text was expected` from `push_config()`. This affects every opcode reply routed through `follow_redirects`, not just upgradeConfig. Fix belongs in `xceadmin`, not the controller. +- **`config push --dry-run`'s "OK" result is not meaningful evidence of anything**: `probe_config()`'s docstring itself notes `OPCode_probeConfigTag` has no dispatch case in `cluster.c`, so the "accepted" response is a client-side inference, not a real wire signal from the controller. Live-verified: dry-run returns exit 0 with no corresponding entry in the controller log at all. +- No `config diff`, no rollback, no version history command. `xceadmin` today has exactly two subcommands: `config build` and `config push [--dry-run]`. +- No client authentication — the trust model is "same posture as controller-to-controller TLS," i.e. encryption without identity verification. + +## Deploying the Controller + +The controller is the only daemon with real config-file/CLI complexity for cluster topology. + +```bash +xce_controller \ + --myname ctrl-1 \ + --peers "ctrl-1=host1:9990,ctrl-2=host2:9990,ctrl-3=host3:9990" \ + --workdir /var/lib/xce/controller \ + --certdir /var/lib/xce/certs \ + --logfile /var/log/xce/ctrl-1.log \ + --vcpus 4 +``` + +- Omit `--peers` for a single-node, non-HA controller. +- `--workdir` holds per-node `conf/` (cluster config) and `data/` (WAL + checkpoint) subdirectories. +- `--certdir` must contain `xce.crt`/`xce.key` — this is the **only** TLS material in the whole stack, used exclusively for controller↔controller HA traffic. Generate a self-signed pair for local/dev use: + ```bash + openssl req -x509 -newkey rsa:2048 -nodes -days 3650 \ + -keyout /var/lib/xce/certs/xce.key -out /var/lib/xce/certs/xce.crt -subj "/CN=xce" + ``` + TLS verification is `SSL_VERIFY_NONE` everywhere in this codebase — no hostname/identity check is enforced regardless of CA, so a CA-signed cert buys you encryption, not authentication. +- Exactly one node (conventionally the first started) needs its `conf/` seeded with an initial `cluster.bin` (via `xceadmin config build`) before first boot; other nodes receive config over the wire via config-push once joined. +- **WAL and snapshot retention in `data/` is fully automatic — no manual purging needed.** Every checkpoint trims WAL segments below a replication-safe floor (a segment is never deleted while any standby still needs it to catch up) and rotates old snapshots down to `snap_keep_n` most recent (default 2 — current + one previous, kept as a last-known-good fallback if a checkpoint is later found corrupt). `snap_keep_n` is tunable via the cluster config's `PersistConfig.snapKeepN` field, not a CLI flag. + +### Local dev cluster (fully automated) + +```bash +/xce-deploy-ha localhost:9991 localhost:9992 localhost:9993 +``` +This is the `xce-deploy-ha` skill wrapping `src/tools/deploy-ha.sh`, which does everything above automatically: generates certs, builds an initial config from `src/configs/*.yaml` via `xceadmin`, and writes `scripts/start.sh ctrl-N [extra flags]` / `scripts/cleanup.sh` under the deploy directory. Start nodes with a short stagger for clean election ordering: +```bash +scripts/start.sh ctrl-1 -vvv & +sleep 0.5 +scripts/start.sh ctrl-2 -vvv & +sleep 0.5 +scripts/start.sh ctrl-3 -vvv & +``` +(`-vvv` is a **positional** arg to `start.sh`, not `VERBOSE=-vvv` — the skill's own docs have this wrong.) + +`scripts/cleanup.sh` wipes logs and every node's `data/`, plus `conf/` for nodes 2..N — ctrl-1's config and all certs survive a cleanup, giving a clean restart without regenerating TLS material or re-authoring config. + +## Deploying the Worker + +```bash +xcecd -c /opt/xce/conf/worker.yaml +# or, without a config file: +xcecd -m controller-host -p 9990 --peers "ctrl-1=h1:9990,ctrl-2=h2:9990" -l /var/log/xce +``` + +- **Must run as root** — `check_user()` exits immediately otherwise. +- Default config path is `/opt/xce/conf/worker.yaml` if `-c` is omitted (and it must exist, or the daemon exits). +- `-c`, if given, **wins over** `-m`/`-p` (those flags are ignored with a warning). +- Minimal `worker.yaml`: + ```yaml + workerconf: + management_list: ["ctrl-1-host"] + controller_port: 9990 + log_level: "info" + log_dir: "/var/log/xce" + ``` +- `--peers "[name=]host:port,..."` enables HA-aware controller discovery: the worker tries each candidate in turn (every 5s by default) until one accepts the join. +- No TLS on this connection — worker↔controller traffic is plaintext. + +## Deploying the Scheduler + +```bash +xce_scheduler --peers "ctrl-1=controller-host:9990" -l /var/log/xce/scheduler.log -v +``` + +- No config file at all — pure CLI (`argp`). +- **Gotcha**: the default controller target is hard-coded to `localhost:9990`. There is no `-m`/`-p` equivalent — the *only* way to point the scheduler at any other host or port, even a single non-HA controller, is `--peers`. Forgetting `--peers` silently targets `localhost:9990` regardless of where your controller actually is. +- `-v` is repeatable for more verbose logging; default log file is `/tmp/xce_scheduler.log`. +- No TLS — plaintext to the controller, same as the worker. +- Scheduling policies (fcfs, limit, parallel/sequential-job allocators) are compiled into the binary, not dynamically loaded plugins. + +## Deploying apiserver + +```bash +apiserver -d /opt/xce/apiserver +``` + +`-d ` is **mandatory** despite the `--help` text implying a default — omitting it exits immediately. `/config/` must already exist and contain: + +| File | Purpose | +|---|---| +| `app.yaml` | HTTP(S) port, JWT secret/expiry, rate limits, CORS, IP whitelist, and the `backend:` block (`address`, `port`, `from`, `key`, optional `peers` for HA) pointing at the controller. | +| `auth.yaml` | Auth provider selection (`config_file` \| `pam` \| `ldap` \| `oauth2`); for `config_file`, embeds usernames/passwords/roles directly. | +| `rbac.yaml` | Permission catalog + role→permission mappings (domains: `self`, `self_ug`, etc.). User→role binding comes from `auth.yaml`, not this file. | +| `logger.yaml` | zap logger level/encoding/rotation. | + +Both `app.yaml` and `logger.yaml` are JSON-Schema-validated at startup (fail-fast on malformed config). + +### Build gotcha — use the Meson/Nix build, not `make build-server` + +`make build-server` (`src/frontend/Makefile`) runs a bare `go build` with **no `CGO_CFLAGS`/`CGO_LDFLAGS` set**. The real controller-connection code (`backend/clib.go`) is CGO and needs those flags to find `libxce`'s headers. Depending on your environment this either fails to compile, or — if `CGO_ENABLED=0` is ambient — silently links `backend/stub.go` instead, producing a binary where every backend call returns `errNoCGO: backend requires CGO`. There is no startup warning; the HTTP server comes up fine and only fails at request time. + +**Use `/xce-build apiserver` (or `nix build .#xcecore`)** for anything that needs to actually talk to a controller — it computes the correct `CGO_CFLAGS`/`CGO_LDFLAGS` from pkg-config and produces `xce_apiserver` under `src/xce.build/frontend/apiserver/` (or the equivalent path for other profiles). Reserve `make build-server`/`make test` for the pure-Go unit-test loop (`CGO_ENABLED=0` is *intentional* there). + +### Relationship to the controller + +apiserver is a **separate OS process**, network-connected to the controller — not embedded, not in-process. It joins the controller's cluster protocol as `HostRole_apiserver` via a CGO-linked `libxce` client (the same join mechanism workers/schedulers use), configured entirely by `app.yaml`'s `backend:` block. If `backend.address` is empty, apiserver logs "running in stub mode" and serves HTTP, but every job/host/queue/cluster handler will fail. No TLS on this connection. + +### TLS + +apiserver can self-terminate HTTPS (`app.yaml`'s `security.https.enabled` + `cert_file`/`key_file`, default a checked-in self-signed dev cert). A reverse-proxy pattern (sample `config/nginx.https.conf`, HAProxy mentioned in steering docs) is the intended production direction but is **not wired into any startup automation** — you'd have to set it up yourself. + +## Putting It Together: A Full Local Cluster + +```bash +# 1. Build everything +/xce-build all + +# 2. Bring up a 3-node HA controller cluster +/xce-deploy-ha localhost:9991 localhost:9992 localhost:9993 +# (start ctrl-1, then ctrl-2/ctrl-3 with a 0.5s stagger, per the deploy script) + +# 3. Start a worker pointed at the cluster +xcecd -m localhost -p 9991 --peers "ctrl-1=localhost:9991,ctrl-2=localhost:9992,ctrl-3=localhost:9993" -l /tmp/xce-worker + +# 4. Start a scheduler pointed at the cluster +xce_scheduler --peers "ctrl-1=localhost:9991,ctrl-2=localhost:9992,ctrl-3=localhost:9993" -v + +# 5. Start apiserver (needs its own config/ dir prepared first — copy from src/frontend/apiserver/config/, +# at minimum set backend.address/port to match the controller and use auth.yaml.example, not the checked-in auth.yaml) +apiserver -d /path/to/apiserver-topdir + +# 6. Use xcecli against apiserver, or xceadmin against the controller directly +xcecli job submit myjob.json +xceadmin config push cluster.bin --controller localhost:9991 +``` + +## Production Gaps + +Be aware of these before treating anything above as a production runbook — they are honest gaps in this repo today, not documented-but-hidden features: + +1. **No process supervision is shipped.** No systemd unit, no Dockerfile, no docker-compose, no supervisord config exists anywhere in this repo for any of the four daemons. A systemd-unit *sketch* exists in `src/docs/config-replication-design.md` but has a wrong binary name (`xcecontroller` vs the real `xce_controller`) and specifies `Type=notify`, which the controller does not support (it never calls `sd_notify`) — using it as written will hang at startup and time out. If you adapt it, switch to `Type=simple` and fix the binary name. +2. **`src/frontend/apiserver/config/auth.yaml` ships plaintext dev credentials checked into git**, including an `admin`/`admin` account and a named-user `cluster_admin` account. Treat all of them as exposed by default — don't ship the checked-in file as-is; copy `auth.yaml.example` and set real credentials/an external auth provider instead. +3. **Only controller↔controller traffic is encrypted.** Worker→controller, scheduler→controller, and apiserver→controller are all plaintext, with no path to enable TLS on them today. +4. **apiserver's own TLS uses a checked-in self-signed cert with no CA trust story**; `xcecli` hardcodes `InsecureSkipVerify: true` against it. A reverse-proxy-terminated-TLS model is sketched (nginx sample config) but not automated. +5. **`xceadmin config push` doesn't work against a real cluster yet** (see xceadmin's Known Limitations above) — the controller side is fine; `xceadmin`'s `discovery.py` fails to unwrap the `Request` envelope around every reply, crashing on decode. +6. **`nix build .#xcecore` is all-or-nothing** — there's no way to build just one daemon via Nix; use `/xce-build ` for per-component builds. + +## Quick Reference + +| Daemon | Binary | Config | Controller-pointing flag | TLS | +|---|---|---|---|---| +| Controller | `xce_controller` | none (CLI only) | `--peers` (omit for single-node) | Yes, controller↔controller only | +| Worker | `xcecd` | `worker.yaml` (or CLI) | `-m`/`-p` (config file wins) or `--peers` | No | +| Scheduler | `xce_scheduler` | none (CLI only) | `--peers` (**required** even for a single non-default controller) | No | +| apiserver | `xce_apiserver` | `config/{app,auth,rbac,logger}.yaml` | `app.yaml`'s `backend:` block | Optional, self-terminated | +| xceadmin | `xceadmin` (Python) | none — takes YAML source dir | `--controller host:port` | Yes, no client cert | diff --git a/src/flake.lock b/src/flake.lock index 1e6e224..bf631ef 100644 --- a/src/flake.lock +++ b/src/flake.lock @@ -117,11 +117,11 @@ "xbuild": "xbuild" }, "locked": { - "lastModified": 1784279748, - "narHash": "sha256-/BsisRl9jS5TPXABUcWxaZ6F06XQpxckwKpR32kIu7w=", + "lastModified": 1785137320, + "narHash": "sha256-zqKunw70hMWgSLNdpm3VWVJhippXTeoLXq8uA58KYlY=", "ref": "master", - "rev": "53cf11e6df4e2f0bbcdf8e26feed74d011b0e9c1", - "revCount": 21, + "rev": "2149f778fc5eaf6071ccc934f074c64e3e93ab32", + "revCount": 22, "type": "git", "url": "ssh://forgejo@gitea.shenrs.eu/rshen/librtti" }, @@ -483,11 +483,11 @@ "uv2nix": "uv2nix_2" }, "locked": { - "lastModified": 1782521464, - "narHash": "sha256-G0Yaq9PTI4ntIf3MdwRw3BLUR+IGSsfbbrLI3yrAwKM=", + "lastModified": 1785136180, + "narHash": "sha256-JiFVD7td5F50sLa1wLxdMG39uxKvADm6qnYIlnMDzPE=", "owner": "shen390s", "repo": "my-nix-channel", - "rev": "073f527ea8f111e7d7b8f5ad21c5004870cbf6cf", + "rev": "612fca8a7cf564a307fc49c36fc03b4162836c66", "type": "github" }, "original": { diff --git a/src/flake.nix b/src/flake.nix index e289a40..811fe85 100644 --- a/src/flake.nix +++ b/src/flake.nix @@ -22,14 +22,6 @@ mypkgs = xbuild.packages.${system} // extralib.packages.${system} // librtti.packages.${system}; overlays = [ (final: prev: mypkgs // prev) - (final: prev: { - capnpc = prev.capnpc.overrideAttrs (oldAttrs: { - src = final.fetchurl { - url = "https://ghfast.top/https://github.com/shen390s/c-capnproto/archive/e45ff682c4756ac5067cbac6d0f282a8ea5f0155.tar.gz"; - hash = "sha256-zsiX6unPF45eISP6sqbQImrivJuSE0BF4bTP/db+lQY="; - }; - }); - }) ]; pkgs = import nixpkgs { inherit overlays system;}; xpkgs = import ./nixSupport/default.nix { diff --git a/src/frontend/apiserver/config/app.yaml b/src/frontend/apiserver/config/app.yaml index e52b182..5c847db 100644 --- a/src/frontend/apiserver/config/app.yaml +++ b/src/frontend/apiserver/config/app.yaml @@ -80,6 +80,6 @@ cors: backend: address: "localhost" - port: 9901 + port: 9990 from: "xce_apiserver" key: "keepsecret$" diff --git a/src/frontend/apiserver/config/auth.yaml b/src/frontend/apiserver/config/auth.yaml index ca603c7..e8c5a42 100644 --- a/src/frontend/apiserver/config/auth.yaml +++ b/src/frontend/apiserver/config/auth.yaml @@ -11,8 +11,8 @@ config_file: - username: admin password: admin roles: [cluster_admin] - - username: rshen - password: Letmein + - username: op7x2k9 + password: CHANGE_ME_dev_only roles: [cluster_admin] - username: user1 password: user1 diff --git a/src/include/client.h b/src/include/client.h index ba178ff..1de3ac5 100644 --- a/src/include/client.h +++ b/src/include/client.h @@ -95,6 +95,14 @@ extern int xcecli_jobctrl(xcecli_ctx_t, xce_jobctrl_t*); extern int xcecli_notify_jobchkpt(xcecli_ctx_t, uint64_t, char*); extern int xcecli_queuectrl(xcecli_ctx_t, xce_queuectrl_t*); extern int xcecli_hostctrl(xcecli_ctx_t, xce_hostctrl_t*); +/* xcecli_upgradeconfig: submit a configuration upgrade (sha256 + serialised + * ClusterConfig blob) to the primary via OP_upgradeConfig, transparently + * surviving a primary change mid-call via XCECLI_FAILOVER_CALL (same + * write-op failover contract as xcecli_hostctrl/xcecli_queuectrl). Returns + * the server's reply status (0 on success). */ +extern int xcecli_upgradeconfig(xcecli_ctx_t, const uint8_t *sha256, + size_t sha256_len, const uint8_t *bytes, + size_t bytes_len); extern int xcecli_runtask(xcecli_ctx_t, xce_taskrun_t*); extern int xcecli_notify_taskstart(xcecli_ctx_t, xce_task_pidinfo_t*); extern int xcecli_notify_taskfail(xcecli_ctx_t, xce_task_failinfo_t*); diff --git a/src/include/myconf.h b/src/include/myconf.h index 39e6987..3bc2e17 100644 --- a/src/include/myconf.h +++ b/src/include/myconf.h @@ -10,6 +10,7 @@ #include #include "clusterconfig.h" +#include "mylock.h" #include "xce/cluster.h" /* Forward declaration — avoids circular include with cluster_def.h */ @@ -50,6 +51,16 @@ typedef struct { uint32_t resmgr_inst_delta; /* --resmgr-inst-delta CLI value; 0 = use hardcoded default */ uint32_t xstrings_nhash; /* --xstrings-nhash CLI value; 0 = use hardcoded default */ uint32_t xstrings_delta; /* --xstrings-delta CLI value; 0 = use hardcoded default */ + /* bug-1476: serializes load_primary_config()'s free-decode-publish + * sequence against concurrent invocations for the SAME myconf_t (e.g. + * two racing handle_repl_config_push deliveries dispatched onto separate + * VTASK_LIVE_BLOCK workers for the same standby -- a live ASan + * heap-use-after-free was caught this way). Must be mylock_init()'d + * before first use (main.c) and mylock_fini()'d in myconf_fini(); test + * fixtures that drive the real load_primary_config()/ + * config_activate_committed() must init it too (see + * t43_attach_myconf/t43_free_myconf in test_config_repl.c). */ + mylock_t lock; } myconf_t; extern cluster_config_t* get_default_conf(void*); diff --git a/src/include/persist.h b/src/include/persist.h index 231c293..103b02b 100644 --- a/src/include/persist.h +++ b/src/include/persist.h @@ -660,12 +660,18 @@ uint64_t persist_entry_term_locked(const persist_t* p, uint64_t lsn); * checkpoint against this member again, so only the checkpoint LSN's own * term needs reconciling — not the full compacted history below it. * - * `checkpoint_term == 0` means a legacy sender (pre-task-3.2 peer) never - * stamped the wire field; treat that as WAL_LEGACY_TERM per the existing - * legacy-0 convention (record_entry_term stores the raw value verbatim; the - * legacy-0 -> WAL_LEGACY_TERM mapping is applied uniformly at read-back by - * persist_entry_term/entry_term_locked, so this call is consistent with that - * convention without needing to special-case it here). + * `checkpoint_term == 0` is unambiguous and means the checkpoint LSN is + * genuinely/permanently absent from the term index, never "legacy term 0, + * present" (bug-1475 Finding 2: the sole sender, ha_snapshot_do_send, always + * computes this value via persist_entry_term, whose own contract already + * returns the distinct WAL_LEGACY_TERM for any present-but-legacy-0 entry — + * so a wire value of exactly 0 can only mean absent). This call substitutes + * TERM_INDEX_UNSET for a wire 0 before recording, instead of the raw value, + * so entry_term_locked reads the checkpoint LSN back as absent on the + * receiver too, matching the sender — recording the raw 0 here (the old + * behavior) let it read back as WAL_LEGACY_TERM instead, permanently + * diverging from the sender's own absent(0) and wedging the next + * AppendEntries whose prevLogIndex lands on this LSN. * * Takes p->lock internally (callers must NOT already hold it). Safe on a * NULL p or checkpoint_lsn == 0 (no-op). */ diff --git a/src/include/repl.h b/src/include/repl.h index 937c32a..c767e3d 100644 --- a/src/include/repl.h +++ b/src/include/repl.h @@ -137,6 +137,16 @@ void repl_start_catchup(replicator_t *r, repl_ep_t ep, uint64_t join_applied_lsn /* Mark standby catch-up complete (called on OP_replCatchUpDone receipt) */ void repl_complete_catchup(replicator_t *r, repl_ep_t ep); +/* bug-1479: look up whether the given standby is currently in catch-up and, + * if so, its corrected resume point (join_applied_lsn). Returns 1 and sets + * *join_applied_lsn_out when in_catch_up is set; returns 0 (leaves + * *join_applied_lsn_out untouched) otherwise. Lets a caller (the heartbeat- + * driven replication decision) use the corrected position instead of a + * standby's own self-reported LSN, which is unreliable for a standby stuck + * rejecting every AppendEntries due to a log conflict. */ +int repl_get_catchup_join_lsn(replicator_t *r, repl_ep_t ep, + uint64_t *join_applied_lsn_out); + /* Returns 1 if standby needs a full snapshot transfer (its LSN predates oldest WAL). * oldest_wal_lsn == 0 means no WAL exists — no snapshot needed for LSN 0 standbys. */ int repl_needs_snapshot(replicator_t *r, uint64_t standby_lsn, uint64_t oldest_wal_lsn); diff --git a/src/include/request.h b/src/include/request.h index 14320dd..d2f4ef0 100644 --- a/src/include/request.h +++ b/src/include/request.h @@ -185,6 +185,19 @@ extern int xce_upgrade_config_req_extract_raw(const uint8_t *pkt_data, size_t *out_len, uint8_t **out_sha256); +/* + * xce_upgradeconfig_req_raw: send OP_upgradeConfig carrying raw byte arrays + * (sha256 + the serialised ClusterConfig blob). Bypasses the generated + * encode_UpgradeConfigRequest path (a no-op for the sha256/bytes Data fields + * — same class of limitation as xce_replconfigpush_req_raw) by constructing + * the capnp message directly via capn_new_list8 + capn_setv8 + write_Request. + * Ordinary CLIENT request: seq/from are populated the same way xce_request() + * populates them for every other client op. + */ +extern int xce_upgradeconfig_req_raw(endpoint_t *ep, + const uint8_t *sha256, size_t sha256_len, + const uint8_t *bytes, size_t bytes_len); + /* ── Client-Side Transparent Retry tunables (Req 6.1, 6.2) ────────────────── * * xce_retry_config_t: configurable retry parameters with safe production diff --git a/src/include/typemap.h b/src/include/typemap.h index b115dbe..42bc394 100644 --- a/src/include/typemap.h +++ b/src/include/typemap.h @@ -443,6 +443,25 @@ typedef struct { uint32_t prevCrc; } capnp_repl_envelope_t; +/* ── Upgrade snapshot admin-state frames (config-upgrade-snapshot task 1, + * Req 1.9/5.7) ─────────────────────────────────────────────────────────── + * Frame-only wire types for the checkpoint's host/queue admin-state + * sections -- carry only the administratively-set (name, status) pair, + * never the full xce_worker_t/xce_queue_t (design.md Design Invariant 5: a + * snapshot frame must never inherit a live struct's dynamic fields just + * because reusing it is convenient). Neither has a corresponding "live" C + * struct, so each gets its own frame-only counterpart here, same as + * capnp_snap_hdr_t/capnp_persist_cfg_t/capnp_repl_envelope_t above. */ +typedef struct { + char* name; + uint32_t status; +} capnp_host_admin_state_t; + +typedef struct { + char* name; + uint32_t status; +} capnp_queue_admin_state_t; + /* ── Config replication Cap'n Proto mapped types (Phase 1) ────────────── * C-side counterparts for the capnp encode/decode shims for config sync. * Struct tags match the forward declarations near the top of this file. */ @@ -472,6 +491,8 @@ struct repl_config_push_req_s { struct repl_config_push_reply_s { int accepted; /* 1 if standby accepted the push */ uint64_t version_tag; /* standby's current version tag after decision */ + uint64_t term; /* replying member's current term (raft-adapter- + * conformance Req 7.4 term-discovery channel) */ }; struct upgrade_config_req_s { diff --git a/src/include/xceapi.h b/src/include/xceapi.h index 7786183..e4f93ae 100644 --- a/src/include/xceapi.h +++ b/src/include/xceapi.h @@ -28,6 +28,17 @@ extern int xce_update_resvals(xce_ctx_t*, int, xce_resval_t**); extern int xce_jobctrl(xce_ctx_t*, xce_jobctrl_t*); extern int xce_queuectrl(xce_ctx_t*, xce_queuectrl_t*); extern int xce_hostctrl(xce_ctx_t*, xce_hostctrl_t*); +/* xce_upgradeconfig: send OP_upgradeConfig (sha256 + serialised ClusterConfig + * blob) via xce_upgradeconfig_req_raw and wait for the reply. Returns the + * server's reply status (0 on success; a negative errno/E_XCE_* code on + * failure — the server logs the human-readable reason, see + * do_upgrade_config_with_bytes/send_upgrade_error, config_repl.c). Mirrors + * xce_hostctrl/xce_queuectrl's shape; the richer UpgradeConfigReply fields + * (version_tag/acked_count/error text) are not surfaced to the caller — no + * consumer of this API currently needs them beyond success/failure. */ +extern int xce_upgradeconfig(xce_ctx_t*, const uint8_t *sha256, + size_t sha256_len, const uint8_t *bytes, + size_t bytes_len); extern int xce_runtask(xce_ctx_t*, xce_taskrun_t*); extern int xce_update_jusage(xce_ctx_t*, uint64_t, int, int*, int, int*, int, xce_rusage_t**); diff --git a/src/lib/client.c b/src/lib/client.c index cde3824..c0b8223 100644 --- a/src/lib/client.c +++ b/src/lib/client.c @@ -778,6 +778,25 @@ int xcecli_hostctrl(xcecli_ctx_t c, xce_hostctrl_t* ctrlinfo) return rc; } +int xcecli_upgradeconfig(xcecli_ctx_t c, const uint8_t *sha256, + size_t sha256_len, const uint8_t *bytes, + size_t bytes_len) +{ + api_ctx_t* ctx = (api_ctx_t*)c; + int rc; + + if ((ctx == NULL) || (sha256 == NULL) || (sha256_len == 0) + || (bytes == NULL) || (bytes_len == 0)) { + return -EINVAL; + } + + rc = XCECLI_FAILOVER_CALL(ctx, /*is_write=*/true, + xce_upgradeconfig(&(ctx->ctx), sha256, + sha256_len, bytes, + bytes_len)); + return rc; +} + int xcecli_runtask(xcecli_ctx_t c, xce_taskrun_t* info) { api_ctx_t* ctx = (api_ctx_t*)c; diff --git a/src/lib/request.c b/src/lib/request.c index df8a063..0036f34 100644 --- a/src/lib/request.c +++ b/src/lib/request.c @@ -499,6 +499,94 @@ int xce_replconfigpush_req_raw(endpoint_t *ep, xce_peerinfo_t *from, return (enq_rc < 0) ? enq_rc : 0; } +/* + * xce_upgradeconfig_req_raw: send OP_upgradeConfig with raw byte arrays. + * + * Bypasses encode_UpgradeConfigRequest (a literal no-op for the sha256/bytes + * Data fields — see the doc comment above upgrade_config_req_s in typemap.h; + * confirmed by inspection of the generated xce.build/lib/controller.capnp.c). + * Instead, constructs the struct Request / struct UpgradeConfigRequest + * directly using the capnp wire-format API (capn_new_list8 + capn_setv8), + * mirroring xce_replconfigpush_req_raw's exact bypass pattern. + * + * Unlike that controller-to-controller helper, this is an ordinary CLIENT + * request: seq and from are populated the same way the generic xce_request() + * populates them for every other client op (endpoint_getseq(ep), ep->peer), + * not passed in by the caller. + */ +int xce_upgradeconfig_req_raw(endpoint_t *ep, + const uint8_t *sha256, size_t sha256_len, + const uint8_t *bytes, size_t bytes_len) +{ + struct capn c; + struct capn_segment *cs; + struct Request rq; + struct UpgradeConfigRequest up_req; + UpgradeConfigRequest_ptr up_ptr; + Request_ptr rp; + io_packet_t *pkt; + int rc; + + if (ep == NULL) + return -EINVAL; + + if (sha256 == NULL || sha256_len == 0 || bytes == NULL || bytes_len == 0) + return -EINVAL; + + capn_init_malloc(&c); + cs = capn_root(&c).seg; + + memset(&rq, 0, sizeof(rq)); + memset(&up_req, 0, sizeof(up_req)); + + /* sha256: write as a List(UInt8) — capn_list8 and capn_data share {capn_ptr p} */ + { + capn_list8 sha_list = capn_new_list8(cs, (int)sha256_len); + capn_setv8(sha_list, 0, sha256, (int)sha256_len); + up_req.sha256.p = sha_list.p; + } + + /* config bytes */ + { + capn_list8 bytes_list = capn_new_list8(cs, (int)bytes_len); + capn_setv8(bytes_list, 0, bytes, (int)bytes_len); + up_req.bytes.p = bytes_list.p; + } + + up_ptr = new_UpgradeConfigRequest(cs); + write_UpgradeConfigRequest(&up_req, up_ptr); + + rq.opcode = OPCode_upgradeConfig; + rq.seq = endpoint_getseq(ep); + rq.body_which = Request_body_upgradeconfigrequestmsg; + rq.body.upgradeconfigrequestmsg = up_ptr; + encode_PeerInfo_ptr(cs, &rq.from, ep->peer); + + rp = new_Request(cs); + write_Request(&rq, rp); + capn_setp(capn_root(&c), 0, rp.p); + + pkt = (io_packet_t *)calloc(1, sizeof(*pkt)); + if (!pkt) { + capn_free(&c); + return -ENOMEM; + } + + pkt->sz = capn_size(&c); + rc = alloc_packet(pkt); + if (rc < 0) { + free(pkt); + capn_free(&c); + return -errno; + } + + capn_write_mem(&c, (uint8_t *)pkt->data, pkt->sz, 0); + capn_free(&c); + + int enq_rc = endpoint_enq(ep, &(pkt->link)); + return (enq_rc < 0) ? enq_rc : 0; +} + /* wal_entry_to_wire: fill a wire WalCatchupEntry from a C entry's header * fields and raw payload bytes. Sub-entry nesting is one level deep — * elements written here never carry their own entries list. */ diff --git a/src/lib/xceapi.c b/src/lib/xceapi.c index c4cb781..02933c5 100644 --- a/src/lib/xceapi.c +++ b/src/lib/xceapi.c @@ -647,6 +647,36 @@ int xce_hostctrl(xce_ctx_t* ctx, xce_hostctrl_t* ctrl) return status; } +int xce_upgradeconfig(xce_ctx_t* ctx, const uint8_t *sha256, + size_t sha256_len, const uint8_t *bytes, + size_t bytes_len) +{ + int rc; + int status; + + if (ctx == NULL) { + return -EINVAL; + } + + if (ctx->state != XCE_CTX_RUN) { + return -EINVAL; + } + + rc = xce_upgradeconfig_req_raw(ctx->ep, sha256, sha256_len, bytes, + bytes_len); + if (rc < 0) { + return rc; + } + + struct timespec _dl; cbuf_deadline_10s(&_dl); + rc = cbuf_timedget(&(ctx->wbuf), &status, &_dl); + if (rc < 0) { + return rc; + } + + return status; +} + int xce_runtask(xce_ctx_t* ctx, xce_taskrun_t* runinfo) { int rc; diff --git a/src/nixSupport/xce.nix b/src/nixSupport/xce.nix index 65c47ed..63a4902 100644 --- a/src/nixSupport/xce.nix +++ b/src/nixSupport/xce.nix @@ -35,6 +35,17 @@ stdenv.mkDerivation { struct2json (capnpc.overrideAttrs (oldAttrs: { separateDebugInfo = true; + # bug-918: upstream xbuild's capnpc package.nix pins src to the + # MUTABLE `main` ref of shen390s/c-capnproto with a hardcoded sha256, + # so it hard-breaks (fixed-output hash mismatch) every time that + # branch moves. Pin to an immutable commit here instead so this repo + # stops depending on upstream's moving target. + src = pkgs.fetchFromGitHub { + owner = "shen390s"; + repo = "c-capnproto"; + rev = "e45ff682c4756ac5067cbac6d0f282a8ea5f0155"; + sha256 = "sha256-9rTlcTia+s9ARGeTi+8auGvM0RkS+wZK7aIkzecaeSk="; + }; })) which findutils diff --git a/src/schema/controller.capnp b/src/schema/controller.capnp index f75f698..d65f102 100644 --- a/src/schema/controller.capnp +++ b/src/schema/controller.capnp @@ -752,6 +752,30 @@ struct SnapshotHeader $C.mapname("capnp_snap_hdr_t") { headerChecksum @8 :UInt32; } +# ── Upgrade snapshot admin-state frames (config-upgrade-snapshot task 1, +# Req 1.9/5.7) ────────────────────────────────────────────────────────── +# Independently-extensible Cap'n Proto frames for the on-disk checkpoint's +# host/queue admin-state sections (SNAPSHOT_FORMAT_VERSION 2, persist.c). +# New admin-state fields (e.g. a lock reason or tag) get new ordinals under +# capnp's own schema-evolution rules -- no future SNAPSHOT_FORMAT_VERSION +# bump needed per field addition. Deliberately NOT mapname'd onto +# Worker/QueueConf (design.md Design Invariant 5): those live runtime +# structs bundle static attrs and dynamic state together, which a snapshot +# frame must never carry (Requirement 1.7 excludes dynamic fields). Each +# maps instead onto its own frame-only C counterpart in typemap.h, matching +# the existing capnp_snap_hdr_t/capnp_persist_cfg_t/capnp_repl_envelope_t +# convention already established below for schema-only wire concepts with +# no corresponding "live" C struct. +struct HostAdminState $C.mapname("capnp_host_admin_state_t") { + name @0: Text; + status @1: UInt32; +} + +struct QueueAdminState $C.mapname("capnp_queue_admin_state_t") { + name @0: Text; + status @1: UInt32; +} + # ── HA heartbeat ──────────────────────────────────────────────────── struct HeartbeatMsg $C.mapname("heartbeat_msg_t") { senderPriority @0: UInt32 $C.mapname("sender_priority"); @@ -781,6 +805,13 @@ struct ReplConfigPushRequest $C.mapname("repl_config_push_req_t") { struct ReplConfigPushReply $C.mapname("repl_config_push_reply_t") { accepted @0: Bool $C.mapname("accepted"); versionTag @1: UInt64 $C.mapname("version_tag"); + # raft-adapter-conformance Requirement 7.4: the replying member's current + # term, so a higher term can be discovered through this reply channel the + # same way it already is through heartbeat and WAL-NACK replies. Additive + # field (ordinal 2) — an old-code standby's reply decodes as term=0 on a + # new-code primary, which can never look like a higher term (terms start + # at 1), so no spurious adoption occurs under mixed-version rollout. + term @2: UInt64 $C.mapname("term"); } struct UpgradeConfigRequest $C.mapname("upgrade_config_req_t") { diff --git a/src/xceadmin/src/xceadmin/discovery.py b/src/xceadmin/src/xceadmin/discovery.py index ef63c04..144b6cc 100644 --- a/src/xceadmin/src/xceadmin/discovery.py +++ b/src/xceadmin/src/xceadmin/discovery.py @@ -12,13 +12,30 @@ Note: design.md's Dependencies list for this component names only ``xcecommon.wire``, but decoding ``RequestReply`` to inspect the redirect fields genuinely requires ``xcecommon.schema`` too -- treated as a design doc omission, not a license to hand-roll capnp decoding here. + +Reply envelope (task 6.1 bug fix, live-verified 2026-07-30 against a real +deployed controller): every reply ``xce_reply()`` (``src/lib/request.c``) +sends over the wire -- ``config push``'s included -- is wrapped in an +outer ``Request{opcode: OPCode_reply, body: union{replymsg @4: +RequestReply}}`` envelope (``controller.capnp:645-651``) before being +serialized, never a bare ``RequestReply``. Decoding raw reply bytes +directly as ``RequestReply`` (the previous behavior here and in +``xceadmin.push``) misaligns every pointer offset and crashes with +``capnp.KjException: ... non-list pointer where text was expected`` on the +very first field access. :func:`decode_reply` is the single place this +unwrap happens -- this module owns it (it already owns "understand the +``RequestReply`` wire shape"), and ``xceadmin.push`` imports it rather than +duplicating the unwrap at its own call site. """ from __future__ import annotations +import contextlib import sys -from xcecommon.errors import ConnectionTimeoutError, NoPrimaryError, TooManyRedirectsError +import capnp + +from xcecommon.errors import ConnectionTimeoutError, NoPrimaryError, ReplyDecodeError, TooManyRedirectsError from xcecommon.schema import load_schema #: "Follow at most 3 redirect hops before reporting an error" (3.2) -- up @@ -26,13 +43,46 @@ from xcecommon.schema import load_schema _MAX_REDIRECT_HOPS = 3 +@contextlib.contextmanager +def decode_reply(reply_bytes: bytes): + """Decode ``reply_bytes`` as the ``Request{opcode: reply, + body.replymsg: RequestReply}`` envelope every controller reply is + wrapped in on the wire (module docstring), and yield the inner + ``RequestReply`` for field access -- e.g. ``with decode_reply(b) as + reply: reply.status``. + + Raises :class:`ReplyDecodeError` (Requirement 7.3) if ``reply_bytes`` + cannot be decoded as a ``Request`` at all, or decodes but + ``body.which()`` is not ``"replymsg"`` (the bytes are not actually a + reply envelope -- this is what the old, wrong bare-``RequestReply`` + wire shape now produces: a defaulted ``"nomsg"`` variant instead of a + crash, confirmed empirically). pycapnp's malformed-message errors are + often raised lazily on field access rather than at ``from_bytes()`` + time, and a byte length that isn't a multiple of 8 words raises a + plain ``ValueError`` instead of ``capnp.KjException`` -- both are + caught here (verified against every corrupt/truncated/empty/garbage + byte shape) so no raw capnp/decode exception ever escapes this + function. + """ + mod = load_schema() + try: + with mod.Request.from_bytes(reply_bytes) as request: + which = request.body.which() + if which != "replymsg": + reason = f"expected reply envelope (body.replymsg), got body.{which}" + raise ReplyDecodeError(f"invalid reply: {reason}", reason) + yield request.body.replymsg + except (capnp.KjException, ValueError) as exc: + reason = str(exc).strip() or "malformed capnp reply envelope" + raise ReplyDecodeError(f"invalid reply: {reason}", reason) from exc + + def _redirect_target(reply_bytes: bytes) -> tuple[str, int] | None: """``None`` when ``reply_bytes`` carries no redirect (empty ``redirectHost`` or zero ``redirectPort``) -- both must be non-empty for this to be a real redirect (3.1). """ - mod = load_schema() - with mod.RequestReply.from_bytes(reply_bytes) as reply: + with decode_reply(reply_bytes) as reply: host, port = reply.redirectHost, reply.redirectPort if host and port: return host, port diff --git a/src/xceadmin/src/xceadmin/push.py b/src/xceadmin/src/xceadmin/push.py index 4f9d5bb..7690c39 100644 --- a/src/xceadmin/src/xceadmin/push.py +++ b/src/xceadmin/src/xceadmin/push.py @@ -49,7 +49,7 @@ from pathlib import Path from xcecommon import wire from xcecommon.errors import ReplyDecodeError from xcecommon.schema import load_schema -from xceadmin.discovery import follow_redirects +from xceadmin.discovery import decode_reply, follow_redirects _DEFAULT_PORT = 9991 @@ -113,7 +113,7 @@ def push_config(cluster_bin_path: str, controller: str) -> PushResult: host, port = _split_controller(controller) _, _, reply_bytes = follow_redirects(host, port, _send_via(request_bytes)) - with mod.RequestReply.from_bytes(reply_bytes) as reply: + with decode_reply(reply_bytes) as reply: if reply.status != 0: return PushResult( version_tag=0, acked_count=0, error=f"controller returned status {reply.status}" diff --git a/src/xceadmin/tests/_live_e2e_common.py b/src/xceadmin/tests/_live_e2e_common.py new file mode 100644 index 0000000..fa40240 --- /dev/null +++ b/src/xceadmin/tests/_live_e2e_common.py @@ -0,0 +1,99 @@ +"""Shared helpers for xceadmin's live E2E test suite (task 6.2's +``test_e2e_live_push.py`` and task 6.3's ``test_e2e_live_ha_push.py``) -- +binary discovery, ephemeral port allocation, waiting for a listener to come +up, and the ``versionTag=.../ackedCount=...`` stdout parser every live +``config push`` invocation needs to check. + +Extracted here (task 6.3) rather than duplicated a second time: task 6.3's +own text asks whether task 6.2's fixture/helpers can be reused for the +multi-node case rather than duplicated. These four helpers (binary +discovery, port allocation, port-wait, the versionTag/ackedCount regex) are +identical text in both files pre-extraction -- genuine repetition, not +speculative generality -- so they move here and both test files import from +it. The two files' *fixtures* (``live_controller`` vs. ``live_ha_cluster``) +stay separate: single-node vs. 3-node deploy/launch/election-wait/cleanup +sequences differ enough (peer strings, staggered multi-process start, +primary-election polling) that merging them would trade a real readability +loss for a smaller one. + +Not a test module itself (no ``test_*`` functions/classes), so pytest's +default collection (``test_*.py``/``*_test.py``) leaves it alone; it is +picked up as an ordinary same-directory import instead (this project's +xceadmin/tests/ has no ``__init__.py``, so pytest's default "prepend" +import mode puts this directory on ``sys.path`` for every test module in +it -- the same mechanism that already lets every test file here import +``conftest.py``'s fixtures without a package-qualified path). +""" + +from __future__ import annotations + +import re +import socket +import time +from pathlib import Path + +SRC_DIR = Path(__file__).resolve().parents[2] +REPO_CONFIGS_DIR = SRC_DIR / "configs" +DEPLOY_HA_SH = SRC_DIR / "tools" / "deploy-ha.sh" + +# Mirrors deploy-ha.sh's own xceadmin/controller discovery order +# (src/tools/deploy-ha.sh) -- xce.build (asan, the default profile) first, +# then release, then debug. +CONTROLLER_CANDIDATES = [ + SRC_DIR / "xce.build" / "controller" / "xce_controller", + SRC_DIR / "build.release" / "controller" / "xce_controller", + SRC_DIR / "build.dbg" / "controller" / "xce_controller", +] +XCEADMIN_CANDIDATES = [ + SRC_DIR / "xce.build" / "xceadmin" / ".venv" / "bin" / "xceadmin", + SRC_DIR / "build.release" / "xceadmin" / ".venv" / "bin" / "xceadmin", + SRC_DIR / "build.dbg" / "xceadmin" / ".venv" / "bin" / "xceadmin", +] + +READY_TIMEOUT_S = 20.0 +VERSION_TAG_RE = re.compile(r"versionTag=(\d+)\s+ackedCount=(\d+)") + + +def find_first_executable(candidates: list[Path]) -> Path | None: + for candidate in candidates: + if candidate.is_file() and (candidate.stat().st_mode & 0o111): + return candidate + return None + + +def free_tcp_port() -> int: + """A port that was free at bind-time -- the same best-effort ephemeral- + port trick used to avoid hardcoding a fixed port a test could collide + on. The bind-then-immediately-close TOCTOU window is acceptable for a + single-shot test deploy. + """ + with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as probe: + probe.bind(("127.0.0.1", 0)) + return probe.getsockname()[1] + + +def free_tcp_ports(count: int) -> list[int]: + """``count`` distinct ports from :func:`free_tcp_port`, de-duplicated + across the batch (a multi-node deploy needs several at once; calling + :func:`free_tcp_port` in a bare loop can occasionally return the same + port twice since each call binds-then-immediately-releases before the + next one binds). Returned in ascending order for a stable, readable + ctrl-1/ctrl-2/ctrl-3 assignment. + """ + ports: set[int] = set() + while len(ports) < count: + ports.add(free_tcp_port()) + return sorted(ports) + + +def wait_for_port(host: str, port: int, timeout_s: float) -> None: + deadline = time.monotonic() + timeout_s + last_err: OSError | None = None + while time.monotonic() < deadline: + try: + with socket.create_connection((host, port), timeout=1.0): + return + except OSError as exc: + last_err = exc + time.sleep(0.2) + raise TimeoutError(f"controller never opened {host}:{port}: {last_err}") diff --git a/src/xceadmin/tests/conftest.py b/src/xceadmin/tests/conftest.py index 69355e0..3885614 100644 --- a/src/xceadmin/tests/conftest.py +++ b/src/xceadmin/tests/conftest.py @@ -9,6 +9,8 @@ from pathlib import Path import pytest +from xcecommon.schema import load_schema + @dataclass(frozen=True) class TlsCertPair: @@ -42,3 +44,29 @@ def tls_certs(tmp_path_factory) -> TlsCertPair: capture_output=True, ) return TlsCertPair(cert_file=cert_file, key_file=key_file) + + +@pytest.fixture +def wrap_reply(): + """Factory fixture: wrap a ``RequestReply`` message builder in the + outer ``Request{opcode: reply, body.replymsg: ...}`` envelope every + real controller reply is sent in on the wire (``xce_reply()``, + ``src/lib/request.c``; ``controller.capnp:645-651``) -- returns the + serialized envelope bytes. + + Task 6.1 bug fix: mock TLS servers across this suite previously sent a + bare ``RequestReply`` on the wire, which matched the old (wrong) + client-side decode assumption. ``xceadmin.discovery.decode_reply`` now + expects the real envelope shape, so every mock server reply must be + wrapped through this helper instead. + """ + + def _wrap(reply_msg) -> bytes: + mod = load_schema() + request = mod.Request.new_message() + request.opcode = "reply" + request.seq = reply_msg.seq + request.body.replymsg = reply_msg + return request.to_bytes() + + return _wrap diff --git a/src/xceadmin/tests/test_cli.py b/src/xceadmin/tests/test_cli.py index 8ec5ea7..c203466 100644 --- a/src/xceadmin/tests/test_cli.py +++ b/src/xceadmin/tests/test_cli.py @@ -196,7 +196,7 @@ def cluster_bin(tmp_path): return str(path) -def test_config_push_success_exits_zero(mock_controller, cluster_bin): +def test_config_push_success_exits_zero(mock_controller, cluster_bin, wrap_reply): from xcecommon import wire mod = load_schema() @@ -209,7 +209,7 @@ def test_config_push_success_exits_zero(mock_controller, cluster_bin): upgrade_reply.versionTag = 5 upgrade_reply.ackedCount = 3 upgrade_reply.error = "" - wire.send_frame(conn, reply.to_bytes()) + wire.send_frame(conn, wrap_reply(reply)) srv = mock_controller(_handler) @@ -224,7 +224,7 @@ def test_config_push_success_exits_zero(mock_controller, cluster_bin): assert "ackedCount=3" in result.output -def test_config_push_zero_acked_count_exits_nonzero(mock_controller, cluster_bin): +def test_config_push_zero_acked_count_exits_nonzero(mock_controller, cluster_bin, wrap_reply): from xcecommon import wire mod = load_schema() @@ -237,7 +237,7 @@ def test_config_push_zero_acked_count_exits_nonzero(mock_controller, cluster_bin upgrade_reply.versionTag = 0 upgrade_reply.ackedCount = 0 upgrade_reply.error = "no quorum" - wire.send_frame(conn, reply.to_bytes()) + wire.send_frame(conn, wrap_reply(reply)) srv = mock_controller(_handler) diff --git a/src/xceadmin/tests/test_config_push_mock.py b/src/xceadmin/tests/test_config_push_mock.py index 3d48e6a..b365a99 100644 --- a/src/xceadmin/tests/test_config_push_mock.py +++ b/src/xceadmin/tests/test_config_push_mock.py @@ -99,7 +99,7 @@ def cluster_bin(tmp_path): # --------------------------------------------------------------------------- -def test_push_config_successful_commit(mock_controller, cluster_bin): +def test_push_config_successful_commit(mock_controller, cluster_bin, wrap_reply): mod = load_schema() received = {} @@ -117,7 +117,7 @@ def test_push_config_successful_commit(mock_controller, cluster_bin): upgrade_reply.versionTag = 7 upgrade_reply.ackedCount = 3 upgrade_reply.error = "" - wire.send_frame(conn, reply.to_bytes()) + wire.send_frame(conn, wrap_reply(reply)) srv = mock_controller(_handler) @@ -133,7 +133,7 @@ def test_push_config_successful_commit(mock_controller, cluster_bin): assert received["sha256"] == hashlib.sha256(Path(cluster_bin).read_bytes()).digest() -def test_push_config_follows_one_redirect_to_primary(mock_controller, cluster_bin): +def test_push_config_follows_one_redirect_to_primary(mock_controller, cluster_bin, wrap_reply): mod = load_schema() def _standby_handler(conn): @@ -144,7 +144,7 @@ def test_push_config_follows_one_redirect_to_primary(mock_controller, cluster_bi # port filled in once the primary server exists, see below reply.redirectPort = _standby_handler.primary_port reply.data.nodata = None - wire.send_frame(conn, reply.to_bytes()) + wire.send_frame(conn, wrap_reply(reply)) def _primary_handler(conn): wire.recv_frame(conn) @@ -154,7 +154,7 @@ def test_push_config_follows_one_redirect_to_primary(mock_controller, cluster_bi upgrade_reply.versionTag = 9 upgrade_reply.ackedCount = 2 upgrade_reply.error = "" - wire.send_frame(conn, reply.to_bytes()) + wire.send_frame(conn, wrap_reply(reply)) primary_srv = mock_controller(_primary_handler) _standby_handler.primary_port = primary_srv.port @@ -166,7 +166,7 @@ def test_push_config_follows_one_redirect_to_primary(mock_controller, cluster_bi assert result.acked_count == 2 -def test_push_config_non_zero_status_reports_error_not_exception(mock_controller, cluster_bin): +def test_push_config_non_zero_status_reports_error_not_exception(mock_controller, cluster_bin, wrap_reply): mod = load_schema() def _handler(conn): @@ -174,7 +174,7 @@ def test_push_config_non_zero_status_reports_error_not_exception(mock_controller reply = mod.RequestReply.new_message() reply.status = 1 reply.data.debugmsg = "simulated failure" - wire.send_frame(conn, reply.to_bytes()) + wire.send_frame(conn, wrap_reply(reply)) srv = mock_controller(_handler) @@ -184,7 +184,7 @@ def test_push_config_non_zero_status_reports_error_not_exception(mock_controller assert "status 1" in result.error -def test_push_config_wrong_reply_variant_raises_reply_decode_error(mock_controller, cluster_bin): +def test_push_config_wrong_reply_variant_raises_reply_decode_error(mock_controller, cluster_bin, wrap_reply): mod = load_schema() def _handler(conn): @@ -192,7 +192,34 @@ def test_push_config_wrong_reply_variant_raises_reply_decode_error(mock_controll reply = mod.RequestReply.new_message() reply.status = 0 reply.data.nodata = None # not upgradeconfigreplymsg - wire.send_frame(conn, reply.to_bytes()) + wire.send_frame(conn, wrap_reply(reply)) + + srv = mock_controller(_handler) + + with pytest.raises(ReplyDecodeError): + push.push_config(cluster_bin, f"127.0.0.1:{srv.port}") + + +def test_push_config_rejects_bare_requestreply_bytes_old_wire_shape_regression( + mock_controller, cluster_bin +): + """Regression test (task 6.1): a mock server that still sends the OLD, + wrong shape -- a bare RequestReply with no outer Request envelope -- + must be cleanly rejected as ReplyDecodeError, not silently accepted + and not an unhandled capnp.KjException. This locks in that the fixed + client only accepts the real controller wire shape. + """ + mod = load_schema() + + def _handler(conn): + wire.recv_frame(conn) + reply = mod.RequestReply.new_message() + reply.status = 0 + upgrade_reply = reply.data.init("upgradeconfigreplymsg") + upgrade_reply.versionTag = 1 + upgrade_reply.ackedCount = 1 + upgrade_reply.error = "" + wire.send_frame(conn, reply.to_bytes()) # NOT wrapped -- old shape srv = mock_controller(_handler) @@ -301,7 +328,7 @@ def test_probe_config_has_no_wire_level_rejection_signal_by_design( # --------------------------------------------------------------------------- -def test_push_config_propagates_too_many_redirects_end_to_end(mock_controller, cluster_bin): +def test_push_config_propagates_too_many_redirects_end_to_end(mock_controller, cluster_bin, wrap_reply): """A real chain of 4 redirecting mock servers -- push_config's own composition with xceadmin.discovery must surface TooManyRedirectsError, not silently follow forever or return a bogus result. @@ -317,7 +344,7 @@ def test_push_config_propagates_too_many_redirects_end_to_end(mock_controller, c reply.redirectHost = "127.0.0.1" reply.redirectPort = next_port_getter() reply.data.nodata = None - wire.send_frame(conn, reply.to_bytes()) + wire.send_frame(conn, wrap_reply(reply)) return _handler diff --git a/src/xceadmin/tests/test_discovery.py b/src/xceadmin/tests/test_discovery.py index 26cdaa8..aa189f4 100644 --- a/src/xceadmin/tests/test_discovery.py +++ b/src/xceadmin/tests/test_discovery.py @@ -1,24 +1,35 @@ """Unit tests for ``xceadmin.discovery`` (design.md, ``xceadmin.discovery``; -Requirements 3.1, 3.2, 3.3, 3.4). +Requirements 3.1, 3.2, 3.3, 3.4, 7.3). """ from __future__ import annotations import pytest -from xcecommon.errors import ConnectionTimeoutError, NoPrimaryError, TooManyRedirectsError +from xcecommon.errors import ConnectionTimeoutError, NoPrimaryError, ReplyDecodeError, TooManyRedirectsError from xcecommon.schema import load_schema from xceadmin import discovery def _reply_bytes(redirect_host: str = "", redirect_port: int = 0) -> bytes: + """Builds the real ``Request{opcode: reply, body.replymsg: + RequestReply}`` envelope -- the actual wire shape every controller + reply is sent in (``xce_reply()``, ``src/lib/request.c``; + ``controller.capnp:645-651``; task 6.1). NOT a bare ``RequestReply`` -- + see ``test_redirect_target_rejects_bare_requestreply_bytes_old_wire_shape`` + below for what happens when the old, wrong shape is decoded. + """ mod = load_schema() - msg = mod.RequestReply.new_message() + inner = mod.RequestReply.new_message() if redirect_host: - msg.redirectHost = redirect_host + inner.redirectHost = redirect_host if redirect_port: - msg.redirectPort = redirect_port - return msg.to_bytes() + inner.redirectPort = redirect_port + request = mod.Request.new_message() + request.opcode = "reply" + request.seq = 1 + request.body.replymsg = inner + return request.to_bytes() def test_follow_redirects_no_redirect_returns_first_reply_unchanged(): @@ -138,3 +149,72 @@ def test_follow_redirects_zero_port_is_not_treated_as_a_redirect(): assert (final_host, final_port) == ("node1", 9991) assert reply_bytes == reply + + +# --------------------------------------------------------------------------- +# decode_reply(): Request{body.replymsg} envelope unwrap (task 6.1) +# --------------------------------------------------------------------------- + + +def test_decode_reply_unwraps_envelope_and_yields_request_reply(): + """The real wire shape -- Request{opcode: reply, body.replymsg: + RequestReply} -- decodes cleanly and yields the inner RequestReply. + """ + reply_bytes = _reply_bytes(redirect_host="primary", redirect_port=9991) + + with discovery.decode_reply(reply_bytes) as reply: + assert reply.redirectHost == "primary" + assert reply.redirectPort == 9991 + + +def test_decode_reply_rejects_bare_requestreply_bytes_old_wire_shape(): + """Regression test (task 6.1): the OLD, wrong client assumption was + that a reply is a bare RequestReply with no outer Request envelope. + Feeding decode_reply exactly that (unwrapped) byte shape must not + silently succeed and must not raise a raw capnp exception -- it must + be cleanly rejected as ReplyDecodeError, proving this is no longer + accepted as a valid reply shape. + """ + mod = load_schema() + bare_bytes = mod.RequestReply.new_message().to_bytes() + + with pytest.raises(ReplyDecodeError) as exc_info: + with discovery.decode_reply(bare_bytes) as _reply: + pass + + assert "replymsg" in exc_info.value.message + + +def test_decode_reply_wraps_truncated_bytes_as_reply_decode_error(): + """A genuinely corrupt/truncated reply must surface as + ReplyDecodeError (Requirement 7.3), never an unhandled + capnp.KjException or ValueError. + """ + full = _reply_bytes(redirect_host="primary", redirect_port=9991) + truncated = full[: len(full) // 2] + + with pytest.raises(ReplyDecodeError): + with discovery.decode_reply(truncated) as _reply: + pass + + +def test_decode_reply_wraps_non_capnp_bytes_as_reply_decode_error(): + """Bytes that aren't capnp at all (e.g. a length not a multiple of 8 + words) raise a plain ValueError inside pycapnp -- confirm that is also + converted to ReplyDecodeError, not left to escape raw. + """ + with pytest.raises(ReplyDecodeError): + with discovery.decode_reply(b"not a capnp message at all") as _reply: + pass + + +def test_follow_redirects_propagates_reply_decode_error_on_corrupt_reply(): + """follow_redirects' own composition with decode_reply (via + _redirect_target) must surface the same ReplyDecodeError, not crash. + """ + + def send_fn(host, port): + return b"\x00" * 4 # too short to be a valid capnp frame + + with pytest.raises(ReplyDecodeError): + discovery.follow_redirects("node1", 9991, send_fn) diff --git a/src/xceadmin/tests/test_e2e_live_ha_push.py b/src/xceadmin/tests/test_e2e_live_ha_push.py new file mode 100644 index 0000000..a978c0f --- /dev/null +++ b/src/xceadmin/tests/test_e2e_live_ha_push.py @@ -0,0 +1,496 @@ +"""Live 3-node HA E2E coverage for `config push` -- success path + the +standby-contact case (task 6.3; Requirements 2.1, 2.5, 2.6, 3.1, 3.2, 3.3). + +Task 6.2's ``test_e2e_live_push.py`` deploys a genuinely single-node +controller (zero HA peers), which structurally cannot exercise a real +positive ``ackedCount`` / exit-0 success path (Requirement 2.6) -- a +peer-less controller has no standbys to ACK, so ``ackedCount`` is always 0 +there (see task 6.2's Implementation Notes entry and that file's own module +docstring). This file closes THAT gap against one live 3-node +``xce_controller`` cluster (reusing ``deploy-ha.sh``'s existing multi-node +pattern -- see ``live_ha_cluster`` below): +``test_live_config_push_against_primary_reaches_success_path`` genuinely +exits 0 with a positive ``ackedCount`` from real standby ACKs. + +REAL FINDING, not a test bug -- the redirect scenario does NOT close the +way the task text originally anticipated: pushing `config push` to a +*standby* does NOT redirect to the primary against a real controller +today, and this is not something a test-only change can fix. This is an +ALREADY-DOCUMENTED, pre-existing gap in design.md's own "Boundary +Commitments" section (`.kiro/specs/admin-config-tool/design.md`, "Out of +Boundary" -- "Redirect wiring for `OP_upgradeConfig`") and "Revalidation +Triggers" (`fill_redirect_reply()` extended to `OPCode_upgradeConfig` is +listed there as a FUTURE, not-yet-done trigger): `fill_redirect_reply()` +(`join.c:27-31`) is only ever invoked from the `OPCode_join` path +(`join.c:277`); nothing calls it for `OPCode_upgradeConfig`. +`RequestReply.redirectHost`/`redirectPort` are therefore never populated +for an `upgradeConfig` reply. Confirmed directly in `cluster.c`'s +`myreq_handler`: a standby's `OP_upgradeConfig` request is rejected by the +generic `ha_dispatch_gate()` role check (`ha.c`, opcode absent from the +`CTRL_STANDBY` allow-list) BEFORE the opcode-specific `case +OPCode_upgradeConfig:` handler ever runs -- the gate-rejection reply path +(`cluster.c` ~line 273-280) sends `reply.status = -XCE_ERR_STANDBY` +(`errnox.h`: `E_XCE_STANDBY == XCE_ERRNO_BASE + 13 == 10014`) with +`data_which = RequestReply_data_nodata` and never touches +`redirectHost`/`redirectPort` at all. Live-verified against a real 3-node +cluster: pushing to a standby returns `versionTag=0 ackedCount=0`, exit 1, +stderr `"Error: controller returned status -10014"` -- no redirect line, +no success. `xceadmin.discovery.follow_redirects`/`decode_reply` behave +exactly per Requirement 3.1's contract given this reply (both fields +absent/empty => no redirect => the bare rejection is returned as-is); the +gap is entirely server-side and out of this task's test-only boundary to +fix (design.md: "This is a controller defect, not an xceadmin defect; +xceadmin implements the client side of the documented contract... and +cannot itself fix the gate"). Task 5.6 already covers the SUCCESSFUL +redirect-follow path against mocks (`test_config_push_mock.py`), which is +still the only place that path is exercised. +``test_live_config_push_against_standby_returns_standby_rejection_not_redirect`` +below live-verifies and regression-locks this REAL current behavior +instead of the hypothetical "redirect then succeed" outcome -- the same +resolution task 6.2 used for its own real-vs-literal-task-text mismatch +(single-node `ackedCount == 0`/exit 1). The moment a future controller-side +task wires `fill_redirect_reply()` for `OPCode_upgradeConfig` (already +tracked as a Revalidation Trigger in design.md), THIS test will start +failing on the "no redirect line" assertion -- that failure is the signal +to replace it with a real success-path assertion, matching what this +docstring originally described before investigation. + +Shares binary discovery / port / stdout-parsing helpers with +``test_e2e_live_push.py`` via ``_live_e2e_common`` (extracted there as part +of this task -- see that module's docstring for the extraction rationale). +The multi-node deploy/launch/election-wait/cleanup fixture itself +(``live_ha_cluster``) is NOT shared with task 6.2's ``live_controller``: +staggered 3-process start, per-peer log polling for primary election, and +building the ``ctrl-N=host:port`` peers string for 3 nodes are enough of a +different shape from a single ``deploy-ha.sh`` call + single process launch +that merging them would cost more readability than it would save. + +Skip convention: identical to task 6.2 -- an imperative ``pytest.skip`` +inside the fixture (no controller binary / no ``openssl``), plus an +in-test skip for a missing ``xceadmin`` binary, both matching this suite's +existing cert-dependent skip precedent (task 5.3). Skipping is the NORMAL +outcome under the fast ``xce-build.sh xceadmin`` / meson path, which runs +pytest from an isolated ``repo-mirror`` with no sibling +``xce.build``/``build.dbg``/``build.release`` controller binaries. + +Process-leak fix (task 6.2's own finding, reused here for all 3 nodes): +each controller is launched as the real ``xce_controller`` binary +directly, never through ``deploy-ha.sh``'s generated ``scripts/start.sh`` +bash wrapper -- that wrapper runs the binary as bash's non-``exec``'d +child, so ``Popen.terminate()`` on the wrapper does not reach the real +controller process and orphans it. + +Election-wait (round-2 remediation -- round-1 review REJECTED the +single-phase version of this gate as flaky, ~75% failure rate over 8 live +runs): polls each of the 3 controller log files for the literal substring +``"CTRL_PRIMARY"`` (``ha.c``'s own election-complete log lines, e.g. ``"HA +FSM: -> CTRL_PRIMARY (term=...)"`` / ``"HA FSM (raft): -> CTRL_PRIMARY +(term=...)"``) rather than a fixed sleep -- the same convention this +repo's own ``test-heartbeat-tolerance.sh`` (``wait_for_primary()``) +already uses, generalized here to check all 3 logs (that script only +checks ``ctrl-1.log``, relying on ctrl-1 usually winning the first +election since it starts first; this test does not assume which node +wins). Round 1 stopped there; that is what made it flaky. + +This file now ALSO ports the second half of ``test-heartbeat-tolerance.sh``'s +own readiness gate that round 1 skipped: that script never proceeds past +``wait_for_primary()`` without immediately also calling +``wait_for_standbys()`` (confirming both other nodes' logs show +``CTRL_STANDBY``) -- round 1's fixture treated a single ``CTRL_PRIMARY`` +log line, alone, as "cluster ready," which does not prove the cluster has +stopped electing: this repo's 3-node bootstrap starts all 3 nodes +``CTRL_STANDBY`` and self-promotes via a PreVote-triggered failover after a +uniform ~10.2s liveness timeout (``ha.h``: ``HA_DEFAULT_HEARTBEAT_TIMEOUT_MS += 10000``) against only a 0.5s start stagger -- a genuine 3-way race where a +second, later election can reshuffle who is primary between "detected +primary" and "pushed to it." ``_wait_for_standbys`` below is that missing +half, generalized the same way ``_wait_for_primary`` already was (checking +the two specific non-primary nodes by name, not a fixed ctrl-2/ctrl-3 +assumption). + +Live reproduction during round-2 remediation (a standalone repro harness, +4 attempts, all with near-identical timing: ports open ~1.2s, CTRL_PRIMARY +~10.2s) surfaced a THIRD failure mode neither round 1 nor the plain +standby-wait alone fully closes: even after both markers are confirmed, +the freshly-promoted primary's own admin port can still be transiently +``ECONNREFUSED`` or accept the TCP connection but reply with an internal +``ETIMEDOUT`` (status -110) for a short window immediately after the +``CTRL_PRIMARY`` log line is written -- consistent with post-promotion +socket/RPC-pipeline warmup that the log line itself does not wait for. +``_POST_ELECTION_SETTLE_S`` (one full ``heartbeat_interval_ms``, ``ha.h``: +``HA_DEFAULT_HEARTBEAT_INTERVAL_MS = 3000`` -- the same constant +``test-heartbeat-tolerance.sh`` keys its own post-election settle sleeps +to) plus a fresh ``wait_for_port`` re-probe of the primary's address right +before the fixture yields (reusing the exact same helper used at initial +boot, not a new one) closes that window: a still-flapping port keeps +retrying inside ``wait_for_port`` instead of racing straight into the +push and surfacing as a confusing ``ConnectionRefusedError``/``ETIMEDOUT`` +deep inside the test body. +""" + +from __future__ import annotations + +import re +import shutil +import subprocess +import time +from dataclasses import dataclass +from pathlib import Path + +import pytest + +from _live_e2e_common import CONTROLLER_CANDIDATES +from _live_e2e_common import DEPLOY_HA_SH, REPO_CONFIGS_DIR +from _live_e2e_common import READY_TIMEOUT_S +from _live_e2e_common import VERSION_TAG_RE +from _live_e2e_common import XCEADMIN_CANDIDATES +from _live_e2e_common import find_first_executable +from _live_e2e_common import free_tcp_ports +from _live_e2e_common import wait_for_port + +_N_NODES = 3 +_STAGGER_S = 0.5 +_ELECTION_TIMEOUT_S = 30.0 +_ELECTION_POLL_S = 1.0 +# One full heartbeat_interval_ms (ha.h: HA_DEFAULT_HEARTBEAT_INTERVAL_MS = +# 3000, the same constant test-heartbeat-tolerance.sh's own post-election +# settle sleeps are keyed to) -- see module docstring's "Election-wait" +# section for the live-reproduced failure mode this closes. +_POST_ELECTION_SETTLE_S = 3.0 + +_PRIMARY_MARKER = "CTRL_PRIMARY" +_STANDBY_MARKER = "CTRL_STANDBY" +# Primary-side evidence that at least one standby genuinely ACKed the push +# (config_repl.c's push_config_to_standbys, on majority ACK): +# "Config committed on majority (tag=..., pushed=X/Y standbys)". +_MAJORITY_ACK_RE = re.compile( + r"Config committed on majority \(tag=([0-9a-f]{16}), pushed=(\d+)/(\d+) standbys\)" +) +# Standby-side evidence that IT received and saved the pushed bytes +# (config_repl.c's handle_repl_config_push, on successful conf_save_config): +# "handle_repl_config_push: config bytes saved out-of-band (pushed tag=...)". +_STANDBY_SAVED_RE = re.compile( + r"handle_repl_config_push: config bytes saved out-of-band \(pushed tag=([0-9a-f]{16})\)" +) + + +@dataclass(frozen=True) +class HaNode: + name: str + addr: str + log_file: Path + + +@dataclass(frozen=True) +class HaCluster: + primary: HaNode + standbys: list[HaNode] + + +def _wait_for_primary(nodes: list[HaNode], timeout_s: float) -> HaNode: + """Poll every node's log for ``ha.c``'s own election-complete marker + (module docstring) rather than a fixed sleep. Returns whichever node's + log shows it first; raises ``TimeoutError`` if none does within + ``timeout_s``. + """ + deadline = time.monotonic() + timeout_s + while time.monotonic() < deadline: + for node in nodes: + if node.log_file.is_file() and _PRIMARY_MARKER in node.log_file.read_text(): + return node + time.sleep(_ELECTION_POLL_S) + raise TimeoutError( + f"no node reached {_PRIMARY_MARKER} within {timeout_s}s " + f"(logs: {[str(n.log_file) for n in nodes]})" + ) + + +def _wait_for_standbys(standby_nodes: list[HaNode], timeout_s: float) -> None: + """Poll each of the (exactly two) non-primary nodes' own logs for + ``ha.c``'s ``CTRL_STANDBY`` marker, mirroring + ``test-heartbeat-tolerance.sh``'s ``wait_for_standbys()`` (module + docstring) -- that script never treats a cluster as ready on + ``wait_for_primary()`` alone. Confirms BOTH other nodes have settled + into steady-state ``CTRL_STANDBY``, closing the round-1 race where a + single ``CTRL_PRIMARY`` log line was treated as sufficient even though + a second, later election could still be in flight. Raises + ``TimeoutError`` naming whichever node(s) never got there. + """ + deadline = time.monotonic() + timeout_s + pending = {node.name: node for node in standby_nodes} + while time.monotonic() < deadline and pending: + for name, node in list(pending.items()): + if node.log_file.is_file() and _STANDBY_MARKER in node.log_file.read_text(): + del pending[name] + if pending: + time.sleep(_ELECTION_POLL_S) + if pending: + raise TimeoutError( + f"standby node(s) {sorted(pending)} never reached {_STANDBY_MARKER} " + f"within {timeout_s}s " + f"(logs: {[str(n.log_file) for n in pending.values()]})" + ) + + +@pytest.fixture +def live_ha_cluster(tmp_path: Path): + """Deploy + start a real 3-node ``xce_controller`` HA cluster via the + project's own ``deploy-ha.sh``, wait for a primary to be elected, and + yield an :class:`HaCluster` naming which node is primary and which two + are standbys. Skips cleanly if no controller binary or ``openssl`` is + available (matching task 6.2's convention). Always kills all 3 + controller processes and removes the scratch deploy directory, on both + success and failure paths. + """ + controller_bin = find_first_executable(CONTROLLER_CANDIDATES) + if controller_bin is None: + pytest.skip( + "no xce_controller binary found under xce.build/build.release/" + "build.dbg -- run xce-build.sh controller [profile] first to " + "exercise this live E2E test" + ) + if shutil.which("openssl") is None: + pytest.skip("openssl not found on PATH -- required by deploy-ha.sh") + + deploy_dir = tmp_path / "deploy" + ports = free_tcp_ports(_N_NODES) + bare_peers = ",".join(f"localhost:{p}" for p in ports) + + deploy = subprocess.run( + ["bash", str(DEPLOY_HA_SH), str(controller_bin), str(deploy_dir), bare_peers], + capture_output=True, + text=True, + ) + assert deploy.returncode == 0, f"deploy-ha.sh failed: {deploy.stdout}\n{deploy.stderr}" + + names = [f"ctrl-{i + 1}" for i in range(_N_NODES)] + addrs = [f"localhost:{p}" for p in ports] + # Matches deploy-ha.sh's own internal PEERS_STR construction exactly + # (src/tools/deploy-ha.sh) -- rebuilt here because this fixture launches + # each controller binary directly rather than through the generated + # scripts/start.sh wrapper (module docstring: process-leak fix). + peers_str = ",".join(f"{name}={addr}" for name, addr in zip(names, addrs)) + + procs: list[subprocess.Popen] = [] + nodes: list[HaNode] = [] + try: + for i, (name, addr) in enumerate(zip(names, addrs)): + log_file = deploy_dir / "logs" / f"{name}.log" + proc = subprocess.Popen( + [ + str(controller_bin), + "--myname", name, + "--peers", peers_str, + "--workdir", str(deploy_dir / "controller"), + "--certdir", str(deploy_dir / "certs"), + "--logfile", str(log_file), + "--vcpus", "4", + ], + stdout=subprocess.DEVNULL, + stderr=subprocess.DEVNULL, + ) + procs.append(proc) + nodes.append(HaNode(name=name, addr=addr, log_file=log_file)) + if i < _N_NODES - 1: + time.sleep(_STAGGER_S) + + for node, port in zip(nodes, ports): + wait_for_port("localhost", port, READY_TIMEOUT_S) + + primary_node = _wait_for_primary(nodes, _ELECTION_TIMEOUT_S) + standby_nodes = [n for n in nodes if n.name != primary_node.name] + _wait_for_standbys(standby_nodes, _ELECTION_TIMEOUT_S) + + # Settle window + fresh port reachability recheck (module + # docstring's "Election-wait" section has the full live-repro + # rationale): give the freshly-promoted primary one heartbeat + # interval to finish post-promotion warmup, then re-probe its port + # with the same helper used at initial boot rather than racing + # straight into the push against a still-flapping listener. + time.sleep(_POST_ELECTION_SETTLE_S) + primary_host, primary_port_str = primary_node.addr.rsplit(":", 1) + wait_for_port(primary_host, int(primary_port_str), READY_TIMEOUT_S) + + yield HaCluster(primary=primary_node, standbys=standby_nodes) + finally: + for proc in procs: + proc.terminate() + for proc in procs: + try: + proc.wait(timeout=10) + except subprocess.TimeoutExpired: + proc.kill() + proc.wait(timeout=10) + shutil.rmtree(deploy_dir, ignore_errors=True) + + +def _build_cluster_bin(xceadmin_bin: Path, tmp_path: Path) -> Path: + cluster_bin = tmp_path / "cluster.bin" + build_result = subprocess.run( + [str(xceadmin_bin), "config", "build", str(REPO_CONFIGS_DIR), "-o", str(cluster_bin)], + capture_output=True, + text=True, + ) + assert build_result.returncode == 0, build_result.stderr + assert cluster_bin.is_file() + return cluster_bin + + +def _assert_no_decode_crash(push_result: subprocess.CompletedProcess) -> None: + # Task 6.1's regression lock, same as task 6.2 -- no raw capnp + # exception or unhandled traceback against REAL wire bytes. + assert "KjException" not in push_result.stderr, push_result.stderr + assert "Traceback" not in push_result.stderr, push_result.stderr + + +def _assert_primary_committed(log_text: str, version_tag_hex: str) -> None: + assert f"tag={version_tag_hex}" in log_text, log_text + assert "Config change committed" in log_text + assert f"Config upgraded to tag={version_tag_hex}" in log_text + assert f"config activated from committed marker tag={version_tag_hex}" in log_text + + +def test_live_config_push_against_primary_reaches_success_path( + live_ha_cluster: HaCluster, tmp_path: Path +) -> None: + """Pushing directly to the elected primary of a real 3-node cluster + exits 0 with a genuinely positive ``ackedCount`` (Requirements 2.1, + 2.5, 2.6) -- the exact success path task 6.2's single-node topology + cannot reach (no standbys there to ACK). Independently confirms via + log evidence: the primary's own commit/activate lines (same as task + 6.2) PLUS the primary's majority-ACK barrier log line naming a + positive per-standby pushed count, AND at least one standby's own log + showing it received and saved the pushed bytes. + """ + xceadmin_bin = find_first_executable(XCEADMIN_CANDIDATES) + if xceadmin_bin is None: + pytest.skip("no xceadmin binary found under xce.build/build.release/build.dbg") + + cluster_bin = _build_cluster_bin(xceadmin_bin, tmp_path) + + push_result = subprocess.run( + [str(xceadmin_bin), "config", "push", str(cluster_bin), "--controller", live_ha_cluster.primary.addr], + capture_output=True, + text=True, + ) + _assert_no_decode_crash(push_result) + + match = VERSION_TAG_RE.search(push_result.stdout) + assert match, f"no versionTag/ackedCount found in stdout: {push_result.stdout!r}" + version_tag, acked_count = int(match.group(1)), int(match.group(2)) + assert version_tag > 0 + + # The real, live 3-node success path task 6.2 could not reach: a + # genuine positive ackedCount (real standby ACKs exist now) and exit 0 + # (Requirement 2.6's postcondition, cli.py's `acked_count > 0` check). + assert acked_count > 0, ( + f"expected a positive ackedCount from real standby ACKs, got {acked_count} " + f"(stdout={push_result.stdout!r} stderr={push_result.stderr!r})" + ) + assert push_result.returncode == 0, push_result.stderr + + version_tag_hex = f"{version_tag:016x}" + primary_log_text = live_ha_cluster.primary.log_file.read_text() + _assert_primary_committed(primary_log_text, version_tag_hex) + + # Majority-ACK barrier evidence on the primary's own log: at least one + # standby genuinely acked this exact tag (push_config_to_standbys). + majority_match = _MAJORITY_ACK_RE.search(primary_log_text) + assert majority_match, primary_log_text + assert majority_match.group(1) == version_tag_hex + pushed, total = int(majority_match.group(2)), int(majority_match.group(3)) + assert pushed >= 1, f"expected >=1 standby acked, got pushed={pushed}/{total}" + + # Independent standby-side evidence: at least one of the two standbys' + # own logs shows it actually received and saved these exact bytes + # (handle_repl_config_push), not just the primary's report of it. + # + # Each standby receives >1 push over the fixture's lifetime -- an + # automatic bootstrap sync of the primary's already-loaded config fires + # right after election (ha_dispatch_repl_action_for_standby), BEFORE + # this test's own xceadmin push -- so this must check every occurrence + # (re.finditer), not just the first (re.search would silently match the + # earlier bootstrap push's tag instead of this push's tag and always + # fail here, independent of whether the real ACK happened). + standby_saw_it = any( + m.group(1) == version_tag_hex + for standby in live_ha_cluster.standbys + for m in _STANDBY_SAVED_RE.finditer(standby.log_file.read_text()) + ) + assert standby_saw_it, [s.log_file.read_text() for s in live_ha_cluster.standbys] + + +# errnox.h: XCE_ERRNO_BASE=10001, E_XCE_STANDBY is the 14th entry (0-indexed +# 13) in that enum => 10001+13=10014. "Controller in CTRL_STANDBY; op is +# primary-only" -- exactly the rejection a standby's OP_upgradeConfig hits +# (module docstring). Named here instead of a bare magic number per this +# project's error-handling convention of surfacing XCE's own error +# vocabulary rather than an unexplained literal. +_E_XCE_STANDBY = 10014 + + +def test_live_config_push_against_standby_returns_standby_rejection_not_redirect( + live_ha_cluster: HaCluster, tmp_path: Path +) -> None: + """Pushing `config push` directly to a standby node against a REAL + controller today does NOT redirect to the primary -- it is flatly + rejected with ``E_XCE_STANDBY`` (module docstring: a pre-existing, + already-documented controller-side gap, `fill_redirect_reply()` never + wired for `OPCode_upgradeConfig`; out of this test-only task's + boundary to fix). This test live-verifies and regression-locks that + REAL current behavior: no redirect line, no success, and specifically + the `E_XCE_STANDBY` status rather than some other/unexpected failure + mode, so a future change to the rejection path itself would also be + caught here even before the redirect gap is closed. + + Confirms via ``discovery.py``'s own stderr line (`follow_redirects`: + "redirected: host:port -> host:port") being ABSENT -- direct evidence + no redirect was attempted, not an inference from the push merely + failing for some other reason. + """ + xceadmin_bin = find_first_executable(XCEADMIN_CANDIDATES) + if xceadmin_bin is None: + pytest.skip("no xceadmin binary found under xce.build/build.release/build.dbg") + + cluster_bin = _build_cluster_bin(xceadmin_bin, tmp_path) + + standby_addr = live_ha_cluster.standbys[0].addr + primary_addr = live_ha_cluster.primary.addr + + push_result = subprocess.run( + [str(xceadmin_bin), "config", "push", str(cluster_bin), "--controller", standby_addr], + capture_output=True, + text=True, + ) + _assert_no_decode_crash(push_result) + + # No redirect was attempted -- the standby's reply never carries + # redirectHost/redirectPort for this opcode (module docstring), so + # discovery.py's follow_redirects has nothing to follow and never + # prints its "redirected: ..." line. + unexpected_redirect_line = f"redirected: {standby_addr} -> {primary_addr}" + assert unexpected_redirect_line not in push_result.stderr, ( + "a redirect line appeared -- if the controller-side redirect gap " + "documented in this file's module docstring (design.md 'Boundary " + "Commitments' / 'Revalidation Triggers') has been closed, this " + "test is stale and should be replaced with a real success-path " + f"assertion: {push_result.stderr!r}" + ) + + match = VERSION_TAG_RE.search(push_result.stdout) + assert match, f"no versionTag/ackedCount found in stdout: {push_result.stdout!r}" + version_tag, acked_count = int(match.group(1)), int(match.group(2)) + + # Real, live-verified standby-contact behavior today: the reply is a + # bare gate rejection (versionTag=0 ackedCount=0), not a redirect or a + # partial success. + assert version_tag == 0 + assert acked_count == 0 + assert push_result.returncode == 1 + assert f"controller returned status -{_E_XCE_STANDBY}" in push_result.stderr, push_result.stderr + + # The rejected push never reached the primary at all -- its log shows + # no upgrade activity from this attempt (independent confirmation this + # is a clean gate rejection, not a landed-then-lost push). + primary_log_text = live_ha_cluster.primary.log_file.read_text() + assert "Config marker failed to reach committed prefix" not in primary_log_text diff --git a/src/xceadmin/tests/test_e2e_live_push.py b/src/xceadmin/tests/test_e2e_live_push.py new file mode 100644 index 0000000..a7022be --- /dev/null +++ b/src/xceadmin/tests/test_e2e_live_push.py @@ -0,0 +1,200 @@ +"""Live single-node E2E coverage for `config push` (task 6.2; Requirements +2.1, 2.5, 2.6, 3.1). + +Every other push test in this suite (``test_config_push_mock.py``) talks to +a mock TLS server standing in for the controller. This file is the one +place the real ``xce_controller`` binary and the real ``xceadmin`` CLI are +exercised together end to end over the actual TLS+capnp wire protocol -- +no mock anywhere. It exists specifically to regression-lock task 6.1's +reply-envelope decode fix (``xceadmin.discovery.decode_reply``) against a +REAL controller reply: task 6.1 itself discovered that this suite's mock +fixtures sent the wrong envelope shape and would never have caught the +crash that only showed up against a live controller. + +Skip convention: an imperative ``pytest.skip`` inside the fixture, mirroring +``conftest.py``'s ``tls_certs`` openssl-missing skip (task 5.3's precedent) +-- not a module-level ``skipif``, since the discovery walk has to happen at +fixture-setup time. Skipping is the NORMAL outcome when this suite runs via +its usual path, ``xce-build.sh xceadmin``: that meson target builds only the +Python package (never the C controller) and runs pytest from an isolated +``repo-mirror`` copy of the source tree with no sibling +``xce.build``/``build.dbg``/``build.release`` controller binaries to find. +This test only runs for real when invoked directly against a real repo +checkout that has already built a controller (``xce-build.sh controller +[profile]``) -- the same "slow, on-demand live E2E" split this project +already uses for ``deploy-ha.sh``/``run-ha-soak.sh``/the ``xce-test-ha`` +skill, which are likewise not part of the fast ``meson test`` path. + +REAL finding, not a test bug (see the task's own CONCERNS writeup): a +genuinely single-node deployment (no HA peers -- ``deploy-ha.sh``'s +single-entry peer-list mode) has ZERO standbys to ACK, so +``push_config_to_standbys`` always returns ``acked=0`` even when the +config-change marker commits and activates successfully server-side +(verified live: the controller log shows "Config change committed", +"Config upgraded to tag=...", and "config activated from committed marker +tag=..." on every push). ``xceadmin.cli``'s postcondition (``acked_count +<= 0`` => ``ClickException``, Requirements 2.6/2.7) cannot distinguish "no +standbys exist" from "push genuinely failed", so a real single-node +``config push`` ALWAYS exits 1 with "push rejected (ackedCount == 0)" -- +this is real, current, verified ``cli.py``/``push.py`` behavior against a +real controller, not a mock artifact or a test mistake. This test asserts +that REAL behavior (exit 1, ackedCount == 0) instead of a hypothetical +"exit 0", and separately verifies via the controller's own log file that +the push, commit, and activation all genuinely succeeded server-side -- +the actual signal this test cares about (task 6.1's crash regression +lock), independent of the CLI's single-node-blind success heuristic (a +pre-existing gap in ``cli.py``/``push.py``, out of this task's boundary to +fix). +""" + +from __future__ import annotations + +import shutil +import subprocess +from pathlib import Path + +import pytest + +from _live_e2e_common import CONTROLLER_CANDIDATES as _CONTROLLER_CANDIDATES +from _live_e2e_common import DEPLOY_HA_SH, REPO_CONFIGS_DIR +from _live_e2e_common import READY_TIMEOUT_S as _READY_TIMEOUT_S +from _live_e2e_common import VERSION_TAG_RE as _VERSION_TAG_RE +from _live_e2e_common import XCEADMIN_CANDIDATES as _XCEADMIN_CANDIDATES +from _live_e2e_common import find_first_executable as _find_first_executable +from _live_e2e_common import free_tcp_port as _free_tcp_port +from _live_e2e_common import wait_for_port as _wait_for_port + + +@pytest.fixture +def live_controller(tmp_path: Path): + """Deploy + start one real, single-node ``xce_controller`` via the + project's own ``deploy-ha.sh`` (module docstring: a single-entry peer + list, so zero standbys -- not "no HA machinery at all"). Skips cleanly + if no controller binary or ``openssl`` is available. Always kills the + controller process and removes the scratch deploy directory, on both + success and failure. + + Yields ``(host_port_str, log_file_path)``. + + Deliberately does NOT launch the controller through deploy-ha.sh's + generated ``scripts/start.sh``: that script runs ``$BINARY ...`` as a + plain (non-``exec``'d) simple command, so the controller is bash's + CHILD, not bash itself. ``Popen.terminate()`` only signals the bash + wrapper; a non-interactive bash's default SIGTERM handling exits + immediately without waiting on/forwarding to its child, orphaning a + live ``xce_controller`` process on every test run (caught empirically + -- four orphaned controllers accumulated across four manual runs + during this task's own verification, still bound to their ports). + Launching the binary directly, with the exact args ``start.sh`` would + have used, makes ``proc`` the real controller process so + ``terminate()``/``kill()`` target it directly. + """ + controller_bin = _find_first_executable(_CONTROLLER_CANDIDATES) + if controller_bin is None: + pytest.skip( + "no xce_controller binary found under xce.build/build.release/" + "build.dbg -- run xce-build.sh controller [profile] first to " + "exercise this live E2E test" + ) + if shutil.which("openssl") is None: + pytest.skip("openssl not found on PATH -- required by deploy-ha.sh") + + deploy_dir = tmp_path / "deploy" + port = _free_tcp_port() + deploy = subprocess.run( + ["bash", str(DEPLOY_HA_SH), str(controller_bin), str(deploy_dir), f"localhost:{port}"], + capture_output=True, + text=True, + ) + assert deploy.returncode == 0, f"deploy-ha.sh failed: {deploy.stdout}\n{deploy.stderr}" + + log_file = deploy_dir / "logs" / "ctrl-1.log" + proc = subprocess.Popen( + [ + str(controller_bin), + "--myname", "ctrl-1", + "--peers", f"ctrl-1=localhost:{port}", + "--workdir", str(deploy_dir / "controller"), + "--certdir", str(deploy_dir / "certs"), + "--logfile", str(log_file), + "--vcpus", "4", + ], + stdout=subprocess.DEVNULL, + stderr=subprocess.DEVNULL, + ) + try: + _wait_for_port("localhost", port, _READY_TIMEOUT_S) + yield f"localhost:{port}", log_file + finally: + proc.terminate() + try: + proc.wait(timeout=10) + except subprocess.TimeoutExpired: + proc.kill() + proc.wait(timeout=10) + shutil.rmtree(deploy_dir, ignore_errors=True) + + +def test_live_config_push_against_real_single_node_controller(live_controller, tmp_path: Path) -> None: + """Real ``xceadmin config build`` + real ``xceadmin config push`` against + a real deployed ``xce_controller`` over actual TLS+capnp -- no mock + anywhere (Requirements 2.1, 2.5, 3.1). + + Asserts (module docstring has the full rationale): + - no crash decoding the real reply (task 6.1's regression lock -- the + actual point of this test) + - a parsed ``versionTag``/``ackedCount`` are present in the output + (2.5) + - the REAL observed single-node exit/ackedCount semantics (ackedCount + == 0, exit 1, "push rejected") rather than a hypothetical exit 0 + - the controller's own log independently confirms the config + genuinely committed, upgraded, and activated server-side (2.6), + decoupled from the CLI's single-node-blind ackedCount heuristic + """ + controller_addr, log_file = live_controller + xceadmin_bin = _find_first_executable(_XCEADMIN_CANDIDATES) + if xceadmin_bin is None: + pytest.skip("no xceadmin binary found under xce.build/build.release/build.dbg") + + cluster_bin = tmp_path / "cluster.bin" + build_result = subprocess.run( + [str(xceadmin_bin), "config", "build", str(REPO_CONFIGS_DIR), "-o", str(cluster_bin)], + capture_output=True, + text=True, + ) + assert build_result.returncode == 0, build_result.stderr + assert cluster_bin.is_file() + + push_result = subprocess.run( + [str(xceadmin_bin), "config", "push", str(cluster_bin), "--controller", controller_addr], + capture_output=True, + text=True, + ) + + # Task 6.1's regression lock: the real controller reply must decode + # cleanly through the Request{body.replymsg} envelope unwrap -- no + # capnp KjException, no unhandled traceback, against REAL wire bytes + # (not a mock fixture that could silently drift from the real shape). + assert "KjException" not in push_result.stderr, push_result.stderr + assert "Traceback" not in push_result.stderr, push_result.stderr + + match = _VERSION_TAG_RE.search(push_result.stdout) + assert match, f"no versionTag/ackedCount found in stdout: {push_result.stdout!r}" + version_tag, acked_count = int(match.group(1)), int(match.group(2)) + assert version_tag > 0 + + # REAL, live-verified single-node behavior (module docstring): a + # genuinely peer-less controller has no standbys to ACK, so + # acked_count is always 0 and xceadmin.cli's `acked_count > 0` + # postcondition reports this as a rejection -- even though, per the + # controller-log assertions below, the push itself fully succeeded. + assert acked_count == 0 + assert push_result.returncode == 1 + assert "push rejected" in push_result.stderr + + log_text = log_file.read_text() + version_tag_hex = f"{version_tag:016x}" + assert f"tag={version_tag_hex}" in log_text, log_text + assert "Config change committed" in log_text + assert f"Config upgraded to tag={version_tag_hex}" in log_text + assert f"config activated from committed marker tag={version_tag_hex}" in log_text