From 06135954ff5aa3ff538b0a2945137742efcff750 Mon Sep 17 00:00:00 2001 From: Rongsong Shen Date: Thu, 11 Jun 2026 13:21:50 +0000 Subject: [PATCH] =?UTF-8?q?chore:=20baseline=20snapshot=20=E2=80=94=20prio?= =?UTF-8?q?r-session=20work=20+=20ha-consistency-invariants=20spec=20famil?= =?UTF-8?q?y?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Pre-existing uncommitted work: ha-repl-hardening payload data plane (7.x), heartbeat liveness fix (Req 1.3), connection-reuse ASAN fixes, doc cleanup. New: ha-consistency-invariants umbrella (requirements/design/research) and its four implementation sub-specs (specs generated via batch, cross-spec review applied), steering roadmap + product.md Raft+CP decision. --- .kiro/specs/.gitignore | 1 + .../specs/ha-commit-barrier-rollout/brief.md | 24 + .../specs/ha-commit-barrier-rollout/design.md | 446 + .../ha-commit-barrier-rollout/requirements.md | 92 + .../ha-commit-barrier-rollout/research.md | 108 + .../specs/ha-commit-barrier-rollout/spec.json | 23 + .../specs/ha-commit-barrier-rollout/tasks.md | 106 + .kiro/specs/ha-commit-engine/brief.md | 24 + .kiro/specs/ha-commit-engine/design.md | 332 + .kiro/specs/ha-commit-engine/requirements.md | 107 + .kiro/specs/ha-commit-engine/research.md | 38 + .kiro/specs/ha-commit-engine/spec.json | 23 + .kiro/specs/ha-commit-engine/tasks.md | 80 + .kiro/specs/ha-config-bootstrap/spec.json | 5 +- .../specs/ha-consistency-invariants/brief.md | 102 + .../specs/ha-consistency-invariants/design.md | 421 + .../ha-consistency-invariants/requirements.md | 99 + .../ha-consistency-invariants/research.md | 168 + .../specs/ha-consistency-invariants/spec.json | 23 + .kiro/specs/ha-convergence-recovery/brief.md | 24 + .kiro/specs/ha-convergence-recovery/design.md | 425 + .../ha-convergence-recovery/requirements.md | 125 + .../specs/ha-convergence-recovery/research.md | 81 + .kiro/specs/ha-convergence-recovery/spec.json | 23 + .kiro/specs/ha-convergence-recovery/tasks.md | 93 + .kiro/specs/ha-heartbeat-liveness/spec.json | 5 +- .kiro/specs/ha-heartbeat-liveness/tasks.md | 8 +- .../specs/ha-peer-connection-reuse/spec.json | 5 +- .kiro/specs/ha-repl-hardening/design.md | 5 +- .kiro/specs/ha-repl-hardening/requirements.md | 4 +- .kiro/specs/ha-repl-hardening/spec.json | 4 +- .kiro/specs/ha-repl-hardening/tasks.md | 47 +- .kiro/specs/ha-single-leader-role/brief.md | 25 + .kiro/specs/ha-single-leader-role/design.md | 338 + .../ha-single-leader-role/requirements.md | 56 + .kiro/specs/ha-single-leader-role/research.md | 135 + .kiro/specs/ha-single-leader-role/spec.json | 23 + .kiro/specs/ha-single-leader-role/tasks.md | 79 + .kiro/specs/ha-wal-replication/brief.md | 61 + .kiro/specs/ha-wal-replication/design.md | 112 + .../specs/ha-wal-replication/requirements.md | 62 + .kiro/specs/ha-wal-replication/spec.json | 22 + .kiro/specs/raft-library/spec.json | 5 +- .kiro/specs/raft-library/tasks.md | 10 +- .../scheduler-controller-msg-gap/spec.json | 9 +- .../scheduler-controller-msg-gap/tasks.md | 2 +- .kiro/specs/worker-join-refactor/tasks.md | 4 +- .kiro/steering/api-standards.md | 144 + .kiro/steering/build-deployment.md | 137 + .kiro/steering/ha-async-io.md | 83 + .kiro/steering/product.md | 23 +- .kiro/steering/roadmap.md | 48 + .kiro/steering/tech.md | 6 +- .wolf/anatomy.md | 962 +- .wolf/buglog.json | 834 +- .wolf/cerebrum.md | 20 +- .wolf/cron-state.json | 91 +- .wolf/daemon.log | 34 + .wolf/hooks/_session.json | 1028 +- .wolf/memory.md | 681 +- .wolf/token-ledger.json | 17908 +++++++++++++++- CLAUDE.md | 99 +- src/controller/CLAUDE.md | 96 +- src/controller/config_repl.c | 97 +- src/controller/ha.c | 81 +- src/controller/job.c | 34 +- src/controller/persist.c | 9 +- src/controller/repl.c | 8 + .../testsuite/test_ha_connection_reuse.c | 4 + src/docs/FUTURE_WORK.md | 111 +- .../apiserver-backend-enhancement-plan.md | 1013 - src/docs/apiserver-backend-gaps.md | 225 - ...apiserver-backend-integration-test-plan.md | 459 - src/docs/apiserver-backend-reviews.md | 325 - src/docs/config-replication-gap-analysis.md | 252 - src/docs/p1-2-host-select.md | 77 +- src/docs/phase6-audit.md | 21 - src/docs/phase6-scheduler-integration-plan.md | 1284 -- src/docs/resreq-ast-cse-impl-plan.md | 233 - src/docs/xce.md | 50 +- src/frontend/CLAUDE.md | 37 +- src/include/request.h | 41 + src/lib/delay.c | 1 - src/lib/meson.build | 1 + src/lib/netio.c | 6 + src/lib/request.c | 284 + src/lib/testsuite/test.c | 2 + src/scheduler/src/scheduler.c | 33 +- 88 files changed, 25611 insertions(+), 5285 deletions(-) create mode 100644 .kiro/specs/.gitignore create mode 100644 .kiro/specs/ha-commit-barrier-rollout/brief.md create mode 100644 .kiro/specs/ha-commit-barrier-rollout/design.md create mode 100644 .kiro/specs/ha-commit-barrier-rollout/requirements.md create mode 100644 .kiro/specs/ha-commit-barrier-rollout/research.md create mode 100644 .kiro/specs/ha-commit-barrier-rollout/spec.json create mode 100644 .kiro/specs/ha-commit-barrier-rollout/tasks.md create mode 100644 .kiro/specs/ha-commit-engine/brief.md create mode 100644 .kiro/specs/ha-commit-engine/design.md create mode 100644 .kiro/specs/ha-commit-engine/requirements.md create mode 100644 .kiro/specs/ha-commit-engine/research.md create mode 100644 .kiro/specs/ha-commit-engine/spec.json create mode 100644 .kiro/specs/ha-commit-engine/tasks.md create mode 100644 .kiro/specs/ha-consistency-invariants/brief.md create mode 100644 .kiro/specs/ha-consistency-invariants/design.md create mode 100644 .kiro/specs/ha-consistency-invariants/requirements.md create mode 100644 .kiro/specs/ha-consistency-invariants/research.md create mode 100644 .kiro/specs/ha-consistency-invariants/spec.json create mode 100644 .kiro/specs/ha-convergence-recovery/brief.md create mode 100644 .kiro/specs/ha-convergence-recovery/design.md create mode 100644 .kiro/specs/ha-convergence-recovery/requirements.md create mode 100644 .kiro/specs/ha-convergence-recovery/research.md create mode 100644 .kiro/specs/ha-convergence-recovery/spec.json create mode 100644 .kiro/specs/ha-convergence-recovery/tasks.md create mode 100644 .kiro/specs/ha-single-leader-role/brief.md create mode 100644 .kiro/specs/ha-single-leader-role/design.md create mode 100644 .kiro/specs/ha-single-leader-role/requirements.md create mode 100644 .kiro/specs/ha-single-leader-role/research.md create mode 100644 .kiro/specs/ha-single-leader-role/spec.json create mode 100644 .kiro/specs/ha-single-leader-role/tasks.md create mode 100644 .kiro/specs/ha-wal-replication/brief.md create mode 100644 .kiro/specs/ha-wal-replication/design.md create mode 100644 .kiro/specs/ha-wal-replication/requirements.md create mode 100644 .kiro/specs/ha-wal-replication/spec.json create mode 100644 .kiro/steering/api-standards.md create mode 100644 .kiro/steering/build-deployment.md create mode 100644 .kiro/steering/ha-async-io.md create mode 100644 .kiro/steering/roadmap.md delete mode 100644 src/docs/apiserver-backend-enhancement-plan.md delete mode 100644 src/docs/apiserver-backend-gaps.md delete mode 100644 src/docs/apiserver-backend-integration-test-plan.md delete mode 100644 src/docs/apiserver-backend-reviews.md delete mode 100644 src/docs/config-replication-gap-analysis.md delete mode 100644 src/docs/phase6-audit.md delete mode 100644 src/docs/phase6-scheduler-integration-plan.md delete mode 100644 src/docs/resreq-ast-cse-impl-plan.md diff --git a/.kiro/specs/.gitignore b/.kiro/specs/.gitignore new file mode 100644 index 0000000..4c5f206 --- /dev/null +++ b/.kiro/specs/.gitignore @@ -0,0 +1 @@ +.claude/ diff --git a/.kiro/specs/ha-commit-barrier-rollout/brief.md b/.kiro/specs/ha-commit-barrier-rollout/brief.md new file mode 100644 index 0000000..51b9ca6 --- /dev/null +++ b/.kiro/specs/ha-commit-barrier-rollout/brief.md @@ -0,0 +1,24 @@ +# Brief: ha-commit-barrier-rollout + +> Sub-spec 2 of 4 implementing the **ha-consistency-invariants** umbrella contract. +> Authoritative requirements/design/research: `.kiro/specs/ha-consistency-invariants/` (design.md §Write-Path Classification + §Config Barrier + §Idempotency Guards). This brief scopes the slice; do not re-derive decisions. + +## Problem +Only WAL_JOB_SUBMIT goes through a commit barrier. Job state changes, queue control, and worker control apply locally with fire-and-forget replication; job/queue control replies before any durability; config push ignores its majority-ACK result; worker-reported facts are silently lost on rejection (bug-396); `mark_job_*` have no idempotency guards. + +## Desired Outcome +Every state-changing WAL type routed per the design's classification table: request-shaped → WAIT mode with **commit-first-then-reply** (validate → mutate provisional → append → commit_submit → reply); fact-shaped → RETAIN mode (log-is-the-queue, appended + retried until committed, no timeout, never dropped while running+leading). Config upgrade fails to the requester on missed majority. `mark_job_*` transitions are idempotent and ordered. + +## Scope +- **In**: classification table + dispatch in `persist.c` (debug assert on unclassified types); reply-ordering sweep of all control handlers in `job.c` (incl. `do_jobcontrol_op`), queue and worker join/update paths; `handle_jobdispatch` classification (per design Reply-Ordering Contract); RETAIN routing for fact WAL types; `push_config_to_standbys` error propagation + caller failure; `mark_job_*` state-machine guards; integration tests (no success reply observable before commit; fact retention across quorum loss). +- **Out**: the commit engine itself (ha-commit-engine); promotion/COMMITTING (ha-single-leader-role); egress filter and demotion (ha-convergence-recovery); worker protocol changes (worker-rejoin-resync backlog). + +## Requirements (umbrella IDs) +2.1 (all operation types), 2.2, 2.8, 5.1, 5.2, 5.3. + +## Upstream / Downstream +- **Upstream**: ha-commit-engine (WAIT/RETAIN API). +- **Downstream**: ha-single-leader-role (must land after this — barrier before state removal); worker-rejoin-resync (shares idempotency guards). + +## Constraints +Commit-first-then-reply is non-negotiable for request-shaped ops; a missed handler silently violates umbrella Req 2.1 — the sweep must be exhaustive (grep all xce_reply sites in control paths). Crash-loss of uncommitted facts accepted until worker-rejoin-resync lands. diff --git a/.kiro/specs/ha-commit-barrier-rollout/design.md b/.kiro/specs/ha-commit-barrier-rollout/design.md new file mode 100644 index 0000000..122b972 --- /dev/null +++ b/.kiro/specs/ha-commit-barrier-rollout/design.md @@ -0,0 +1,446 @@ +# Design: ha-commit-barrier-rollout + +> Sub-spec 2 of 4 of the **ha-consistency-invariants** umbrella. This design slices the umbrella design's **Write-Path Classification**, **Config Barrier**, and **Idempotency Guards** components (`.kiro/specs/ha-consistency-invariants/design.md`), implementing umbrella Migration Strategy phase 2. The umbrella's WAL-type classification table and Reply-Ordering Contract are the contract; this design records their call-site verification (which the umbrella explicitly mandated) and the enforcement mechanism. The commit engine interface (`include/commit.h`, `commit_submit` WAIT/RETAIN) is consumed exactly as shipped by ha-commit-engine — this spec never modifies `commit.c` internals. Requirement IDs below are THIS spec's IDs (see `requirements.md` for the umbrella mapping). + +## Overview + +**Purpose**: This feature extends the majority-commit barrier from job submission to every cluster-state-changing operation: request-shaped operations reply to their requester only after commit (and fail on timeout), fact-shaped operations are appended and retained until committed with no timeout, configuration upgrades fail honestly to the admin tool, and job state transitions become idempotent so retained-fact retry and replay are safe. + +**Users**: Cluster operators gain the guarantee that any confirmed control operation survives failover and that worker-reported reality is never silently dropped; downstream sub-specs (ha-single-leader-role, ha-convergence-recovery) gain a write path that is barrier-complete before the transitional leader state is removed. + +**Impact**: Adds a classification dispatch at the persistence hook seam (persist.c) with a fail-fast guard for unclassified WAL types; restructures `do_jobcontrol_op` (job.c:921-934), `do_queuecontrol_op` (queue.c:119-132), `do_hostcontrol_op` (worker.c:689-702), and `handle_worker_join` (join.c:33-119) to commit-first-then-reply; admits fact-bearing opcodes through the dispatch gate during quorum loss (ha.c:1527); propagates the config majority-ACK result from `push_config_to_standbys` (config_repl.c:866-930) to the `upgradeConfig` requester (config_repl.c:1057-1094); adds state-machine guards to `mark_job_*` (job.c:583/638/696/726); and retires the legacy walAck counting fallback in `repl_wait_majority_ack` (repl.c:386-462) while hardening its configAck branch. + +### Goals +- Commit-first-then-reply for every request-shaped control handler; `handle_jobsubmit` (job.c:495-581) is the reference implementation and stays unchanged +- Fact WAL types routed RETAIN (log-is-the-queue): appended + broadcast, pending purely by `lsn > committed_lsn`, never dropped while running+leading, accepted even during quorum loss +- An unclassified state-changing WAL type cannot silently bypass the barrier (debug assert; production fact-fallback) +- Config upgrade fails to the requester on missed majority and does not restart into the failed config +- `mark_job_*` idempotent and ordered (duplicate = no-op; terminal→non-terminal rejected) + +### Non-Goals +- Commit engine internals: per-LSN evaluation, admission cap, `committed_lsn` advancement (ha-commit-engine — consumed as-is) +- Promotion no-op / own-term gate consumers / CTRL_PRIMARY_COMMITTING removal (ha-single-leader-role; the gate's COMMITTING branch keeps rejecting facts until that spec deletes the state — known residual) +- Demotion truncate+restart, rejoin reconciliation, egress watermark filter, ACK-driven catch-up, quorum-transition logging (ha-convergence-recovery) +- Worker protocol changes; recovery of facts that never reached the controller or died with it (worker-rejoin-resync backlog — umbrella-locked: crash-loss of uncommitted facts accepted until then) +- WAL_NOOP introduction (ha-single-leader-role adds the type; the classification guard here forces it to be classified when it lands) + +## Boundary Commitments + +### This Spec Owns +- The WAL-type → commit-mode classification table, its dispatch at the persistence hook seam, and the unclassified-type guard +- The reply ordering of every request-shaped control handler on the primary (job control, queue control, worker control, worker join/update) and the receipt-ACK verdict for scheduler-origin handlers +- The commit-barrier helper (`persist_commit_barrier`) that handlers use to realize WAIT-mode completion +- Fact admission through the dispatch gate's no-write-quorum path (opcode allowlist only — not quorum accounting) +- Config-change barrier error propagation: `push_config_to_standbys` return contract, configAck majority arithmetic, and the `upgradeConfig` caller's failure path +- `mark_job_*` transition guards +- Retirement of the legacy (engine-less) walAck counting in `repl_wait_majority_ack` + +### Out of Boundary +- `commit.c` / `include/commit.h` — consumed, never modified (interface changes there trigger revalidation here) +- `ha_has_write_quorum` and quorum accounting (ha-commit-engine); the gate's role-based branches other than the PRIMARY no-quorum opcode list +- `committed_lsn` advancement rules, admission cap, membership re-evaluation (commit engine) +- Egress filtering of provisional state to the scheduler (ha-convergence-recovery; dispatch of uncommitted submits is closed there) +- Standby-side apply, WAL wire format, catch-up streaming mechanics (ha-wal-replication) +- Worker/scheduler retry behavior on error replies (client-side, existing semantics) + +### Allowed Dependencies +- `commit_submit(ce, lsn, COMMIT_MODE_WAIT|RETAIN, timeout_ms)` and the engine instance embedded in `cluster_t` (ha-commit-engine, P0) — the only commit-evaluation authority +- `persist_wal_async` / `persist_wal_sync_append` append+broadcast primitives and `persist_t.current_lsn` / `committed_lsn` atomics (persist.c, P0) +- `repl_on_config_ack` / `acked_config_lsn` per-standby config tracking (repl.h, P0) — read-only consumption for the config barrier +- Hook dispatch (`xce_run_hooks`, HOOK_AFTER_EVENT seam) — existing pattern, unchanged signatures +- Threading rules per `ha-async-io.md`: commit-barrier waits only on vtask threads; nothing here runs on iomgr +- Dependency direction: handlers (job.c/queue.c/worker.c/join.c) → persist.c barrier/classification → commit engine; persist.c never calls back into handlers + +### Revalidation Triggers +- Any change to `commit.h` signatures or return codes (upstream) → re-verify barrier helper and handler error mapping +- ha-single-leader-role adding WAL_NOOP or removing CTRL_PRIMARY_COMMITTING → classification table gains the WAL_NOOP row (RETAIN, umbrella-fixed); gate COMMITTING branch disappears +- Any new state-changing opcode/WAL type → must be added to the classification table (the debug assert makes this unmissable) and its handler swept for reply ordering +- worker-rejoin-resync landing → re-verify `mark_job_*` guards against its replay ordering +- Changes to `acked_config_lsn` semantics or the upgradeConfigAck payload → re-verify configAck majority arithmetic + +## Architecture + +### Existing Architecture Analysis +- All state-changing writes flow through one seam: entity mutation fires `HOOK_AFTER_EVENT`, and `persist_job_hook_fun` / `persist_queue_hook_fun` / `persist_worker_hook_fun` (persist.c:1093/1172/1204) map hook details to WAL types via `detail_to_wal_type` (persist.c:1068-1088) and append. Only WAL_JOB_SUBMIT uses the sync barrier (persist.c:1107-1129); everything else is `persist_wal_async` fire-and-forget +- Request handlers reply immediately after mutation: `do_jobcontrol_op` (job.c:932), `do_queuecontrol_op` (queue.c:130), `do_hostcontrol_op` (worker.c:700), `handle_worker_join` (join.c:109) — all violate umbrella 2.1 today. `handle_jobsubmit` (job.c:563-578) is the proven correct shape +- Queue/worker/job-state hooks fire while the entity WRITE lock is held (queue.c:76-112, job.c:629-631/687-689); job-submit's hook runs after the job locks are released (job.c:553) — this asymmetry drives WAIT placement (below) +- Facts arrive via `do_notify` (cluster.c:118-157, no reply) and `do_update_op`/`do_set_preason`/`do_clr_preason` (receipt-style replies); the dispatch gate (ha.c:1527) rejects `OPCode_notify` with `-XCE_ERR_NOT_READY` under quorum loss → permanent silent fact loss (bug-396 family, verified pre-existing) +- Call-site verification of the umbrella classification table (mandated by the umbrella): WAL_JOB_STOP/RESUME are appended only from `on_job_stop`/`on_job_resume`, which are invoked exclusively from `do_notify` (worker-reported stop/resume facts). Client job control (`do_jobcontrol_op` → `job_ctrl`, job.c:306-438) either forwards to the worker (running job — no local entry) or mutates locally via `mark_job_update`/`mark_job_fail` (not-started job → WAL_JOB_UPDATE/WAL_JOB_FAIL). WAL_JOB_UPDATE is absent from the umbrella table and is dual-origin (request: job_ctrl; fact: on_job_postdone, rusage update). Resolution: STOP/RESUME/UPDATE/FAIL classify as fact/RETAIN at the seam, and the umbrella's intent for client job control — "error to client" — is realized by the handler-level commit barrier in `do_jobcontrol_op` (the Reply-Ordering Contract's handler sequence is the umbrella-authoritative mechanism). Recorded in research.md +- `push_config_to_standbys` (config_repl.c:866-930) calls `repl_wait_majority_ack(configAck)` at 916-917 but only logs the result and returns the push count; the caller (config_repl.c:1057) ACKs the admin tool with status=0 and restarts regardless. The configAck counting (repl.c:418-438) has the same defects the engine fixed for walAck: `acked_config_lsn > 0` (any previous ack counts), `n_active == 0 → success`, denominator `n_active` instead of `n_peers` + +### Architecture Pattern & Boundary Map + +```mermaid +graph TB + subgraph requesters + CLI[client and cli ops] + SCHED[scheduler] + WK[worker] + ADM[admin tool] + end + subgraph controller_primary + GATE[ha dispatch gate
fact allowlist] + H[request handlers
job queue worker join] + F[fact handlers
notify update preason] + HOOKS[persist hooks
classification dispatch] + BAR[persist_commit_barrier] + CB[config barrier
config_repl] + CE[commit engine
consumed] + GUARD[mark_job guards] + end + CLI --> GATE + SCHED --> GATE + WK --> GATE + ADM --> GATE + GATE --> H + GATE --> F + H --> GUARD + F --> GUARD + GUARD --> HOOKS + HOOKS -->|append plus RETAIN register| CE + H -->|before success reply| BAR + BAR -->|commit_submit WAIT| CE + ADM -.upgradeConfig.-> CB + CB -->|configAck majority| CE +``` + +**Architecture Integration** (sliced from umbrella): +- Selected pattern: classification at the single persistence seam + completion at the handler. The seam guarantees no entry type escapes classification (2.1, 2.2); the handler realizes the umbrella Reply-Ordering Contract sequence "validate → mutate (provisional) → WAL append → commit_submit(WAIT) → reply" (1.1) +- WAIT placement decision: WAL_JOB_SUBMIT keeps its in-hook sync barrier (hook runs lock-free, engine-wired upstream). All other request-shaped types complete via `persist_commit_barrier()` called by the handler after entity locks are released — blocking a commit wait under a queue/job/worker WRITE lock would stall readers for up to the commit timeout. Same completion semantics, umbrella-conformant placement (the contract names the handler sequence) +- Existing patterns preserved: hook-based persistence dispatch, provisional in-memory mutation order (umbrella-locked), `errnox` early-return error style, full fan-out broadcast +- Steering compliance: barrier waits only on vtask threads (handlers run on the vtask pool); iomgr untouched; TDD with testsuite/ tests first + +### Technology Stack + +| Layer | Choice / Version | Role in Feature | Notes | +|-------|------------------|-----------------|-------| +| Backend / Services | C (gnu17), pthreads, stdatomic | classification, barrier helper, handler restructure | no new dependencies, no .capnp changes | +| Data / Storage | existing WAL (persist.c), wal_types.h enum | classification keyed on `wal_entry_type` + worker detail | no on-disk format change | +| Build / Test | meson, testsuite/ pattern | new `test_commit_barrier_rollout.c` | XCE_TESTING seams | + +## File Structure Plan + +### Directory Structure +``` +src/controller/ +├── persist.c # MODIFIED — classification dispatch, RETAIN registration, +│ # persist_commit_barrier, unclassified guard +├── job.c # MODIFIED — do_jobcontrol_op reply ordering; mark_job_* guards +├── queue.c # MODIFIED — do_queuecontrol_op reply ordering +├── worker.c # MODIFIED — do_hostcontrol_op reply ordering +├── join.c # MODIFIED — handle_worker_join reply ordering +├── ha.c # MODIFIED — dispatch-gate fact allowlist (PRIMARY branch only) +├── config_repl.c # MODIFIED — push_config_to_standbys return contract; caller failure path +├── repl.c # MODIFIED — legacy walAck counting retired; configAck branch hardened +└── testsuite/ + └── test_commit_barrier_rollout.c # NEW — classification, barrier ordering, fact retention, + # config barrier, idempotency guards +src/include/persist.h # MODIFIED — wal_commit_mode_t enum, wal_classify(), + # persist_commit_barrier() declarations +src/include/repl.h # MODIFIED — configAck evaluation reuses the entry_lsn + # parameter (added by ha-commit-engine) as the + # config push tag; no new parameter +``` + +### Modified Files (what and why) +- `src/include/persist.h` — declares `wal_commit_mode_t { WAL_MODE_WAIT, WAL_MODE_RETAIN, WAL_MODE_LOCAL }`, `wal_commit_mode_t wal_classify(uint32_t wal_type, int detail)`, `int persist_commit_barrier(persist_t *p, uint32_t timeout_ms)` +- `src/controller/persist.c` — `wal_classify` table; all three hook functions consult it: WAIT → existing sync path (submit) or async append with handler-owed barrier; RETAIN → `persist_wal_async` + `commit_submit(RETAIN)` registration; LOCAL → unchanged (WAL_CHECKPOINT); unclassified → `assert(0)` under XCE_TESTING, ERROR + RETAIN fallback in production. `persist_commit_barrier` implemented here (snapshot `current_lsn`, `commit_submit(WAIT)`) +- `src/controller/job.c` — `do_jobcontrol_op` (job.c:921-934): barrier between `job_ctrl` success and the reply. `mark_job_start/finish/fail/update` (job.c:583/638/696/726): transition guards before mutation +- `src/controller/queue.c` — `do_queuecontrol_op` (queue.c:119-132): barrier between `queue_ctrl` success and the reply +- `src/controller/worker.c` — `do_hostcontrol_op` (worker.c:689-702): barrier between `worker_ctrl` success and the reply +- `src/controller/join.c` — `handle_worker_join` (join.c:33-119): barrier between the AFTER_EVENT hook and the reply at join.c:107-109; join failure (idx < 0) keeps replying immediately +- `src/controller/ha.c` — `ha_dispatch_gate` PRIMARY no-quorum allowlist (ha.c:1537-1556): add `OPCode_notify`, `OPCode_update`, `OPCode_setpreason`, `OPCode_clrpreason` +- `src/controller/config_repl.c` — `push_config_to_standbys` returns the barrier result (0 / `-ETIMEDOUT`), push count via out-param; passes the in-flight tag for per-push evaluation; caller `do_upgrade_config_with_bytes` (config_repl.c:1057): on failure send error reply, skip restart +- `src/controller/repl.c` — walAck branch of `repl_wait_majority_ack`: legacy counting removed (engine is mandatory on this path; `ce == NULL` becomes a programming error); configAck branch: per-push comparison (`acked_config_lsn >= push_tag`), majority over `n_peers` counting self, `n_peers > 1` with zero standby acks never succeeds +- `src/controller/meson.build` — register `testsuite/test_commit_barrier_rollout.c` + +## System Flows + +### Request-shaped control operation (job/queue/worker control, worker join) + +```mermaid +sequenceDiagram + participant R as requester + participant V as vtask thread handler + participant E as entity lock scope + participant P as persist hooks + participant CE as commit engine + R->>V: control request + V->>V: dispatch gate incl write quorum + V->>E: lock, validate, mutate provisional + E->>P: HOOK_AFTER_EVENT append entries + P->>CE: persist_wal_async + register + E->>V: unlock, rc + alt rc != 0 + V->>R: error reply + else rc == 0 + V->>CE: persist_commit_barrier WAIT + alt committed + V->>R: success reply + else timeout or not ready + V->>R: error reply + end + end +``` + +Flow decisions: the barrier waits on a snapshot of `current_lsn` taken after the mutation returns — single-writer appends and contiguous commit advancement guarantee the snapshot covers every entry the operation produced (1.1, 1.4); waiting may also cover unrelated concurrent entries (bounded by the commit timeout, harmless — they must commit anyway); `-ETIMEDOUT`/`-XCE_ERR_NOT_READY` map to the error reply via the existing `errnox` style (1.2, 1.3); no in-memory rollback (provisional model, umbrella-locked — outcome converges per umbrella 2.5, owned downstream). + +### Fact-shaped delivery (worker notify, rusage update, preason, worker dead) +Gate admits the opcode even without write quorum (3.2) → handler applies the transition through the `mark_job_*` guards (5.1-5.3) → hook classifies the WAL type RETAIN → `persist_wal_async` append + broadcast + `commit_submit(RETAIN)` (returns immediately, no timeout) → handler returns (notify: no reply; update/preason: receipt-style reply unchanged, verdict per 2.3/2.4). The fact is pending purely by `lsn > committed_lsn`; catch-up streaming re-delivers the uncommitted suffix and `committed_lsn` advances when ACKs resume (3.1, 3.3, 3.4). No new queue structure exists (log-is-the-queue, umbrella-locked). + +### Configuration upgrade + +```mermaid +sequenceDiagram + participant A as admin tool + participant U as do_upgrade_config_with_bytes + participant PS as push_config_to_standbys + participant S as standbys + A->>U: OP_upgradeConfig + U->>U: validate, save to disk, bump generation + U->>PS: push bytes, in-flight tag + PS->>S: parallel push threads + S-->>PS: OP_upgradeConfigAck tag + PS->>PS: majority of n_peers acked tag, self counted + alt majority within timeout + PS-->>U: 0, acked count + U->>U: committed_config_tag advanced + U->>A: success reply + U->>U: request restart + else timeout + PS-->>U: -ETIMEDOUT + U->>A: error reply upgrade failed + U->>U: no restart, tag not committed + end +``` + +Flow decisions: `committed_config_tag` advances only inside the majority branch (4.3 — already correct, preserved); the failure path uses the existing `send_upgrade_error` shape so the admin tool sees a definite failure (4.2); restart is gated on success (4.4 — closes the roadmap residual "don't restart before the commit barrier passes"); config remains a parallel, simpler track sharing only the majority arithmetic rule with the engine (umbrella-locked: one in-flight config change at a time). + +## Requirements Traceability + +| Requirement | Summary | Components | Flows | +|-------------|---------|------------|-------| +| 1.1 | success reply only after majority commit | Reply-Ordering Sweep, Commit Barrier Helper | request control | +| 1.2 | commit timeout → error reply | Commit Barrier Helper, Reply-Ordering Sweep | request control | +| 1.3 | not-ready rejection → error reply | Commit Barrier Helper (engine code passthrough) | request control | +| 1.4 | no success-interpretable reply pre-commit | Reply-Ordering Sweep (integration-test assertion) | request control | +| 2.1 | every WAL type classified WAIT/RETAIN | Write-Path Classification | both write flows | +| 2.2 | unclassified type fails fast / fact-fallback | Write-Path Classification (guard) | — | +| 2.3 | dispatch ACK is receipt-only | Reply-Ordering Sweep (handle_jobdispatch verdict) | — | +| 2.4 | exhaustive reply-site verification | Reply-Ordering Sweep (audit) | — | +| 3.1 | facts appended, retried, no timeout | Write-Path Classification (RETAIN routing) | fact delivery | +| 3.2 | facts accepted during quorum loss | Fact Gate Admission | fact delivery | +| 3.3 | uncommitted facts never discarded | Write-Path Classification (RETAIN; log-is-the-queue) | fact delivery | +| 3.4 | facts commit after quorum restore, no redelivery | Write-Path Classification + existing catch-up (verified by test) | fact delivery | +| 4.1 | config confirmed only after majority | Config Barrier | config upgrade | +| 4.2 | config timeout → failed to requester | Config Barrier | config upgrade | +| 4.3 | unacked config never committed | Config Barrier (tag advance in success branch only) | config upgrade | +| 4.4 | failed upgrade does not restart | Config Barrier (caller) | config upgrade | +| 5.1 | duplicate transition is logged no-op | Idempotency Guards | fact delivery | +| 5.2 | terminal→non-terminal rejected with WARN | Idempotency Guards | fact delivery | +| 5.3 | replay-once equivalence | Idempotency Guards | fact delivery | + +## Components and Interfaces + +| Component | Layer | Intent | Req Coverage | Key Dependencies | Contracts | +|-----------|-------|--------|--------------|------------------|-----------| +| Write-Path Classification | controller/persist.c | route every WAL type to its commit mode at the hook seam | 2.1, 2.2, 3.1, 3.3, 3.4 | commit engine (P0), hooks (P0) | Service | +| Commit Barrier Helper | controller/persist.c | handler-callable WAIT completion on the appended watermark | 1.1, 1.2, 1.3 | commit engine (P0) | Service | +| Reply-Ordering Sweep | controller/job.c, queue.c, worker.c, join.c | commit-first-then-reply in every request handler; receipt-ACK verdicts | 1.1, 1.2, 1.3, 1.4, 2.3, 2.4 | Commit Barrier Helper (P0) | Service | +| Fact Gate Admission | controller/ha.c | admit fact-bearing opcodes without write quorum | 3.2 | dispatch gate (P0) | Service | +| Config Barrier | controller/config_repl.c, repl.c | per-push config majority with error propagation | 4.1, 4.2, 4.3, 4.4 | repl_on_config_ack tracking (P0) | Service | +| Idempotency Guards | controller/job.c | safe duplicate/replay of job transitions | 5.1, 5.2, 5.3 | — | Service | + +### Write-Path Classification (`persist.c`, `src/include/persist.h`) + +| Field | Detail | +|-------|--------| +| Intent | Single seam where every state-changing WAL append is classified and registered with the engine | +| Requirements | 2.1, 2.2, 3.1, 3.3, 3.4 | + +**Classification table** (umbrella table verified against call sites — verification deviations recorded in research.md §2; this verified table is the implementation contract): + +| WAL type (+ detail) | Verified origin | Shape | Mode | Failure behavior | +|---|---|---|---|---| +| WAL_JOB_SUBMIT | handle_jobsubmit (client) | request | WAIT (existing in-hook sync path) | error to client (reference impl, unchanged) | +| WAL_QUEUE_CTRL | do_queuecontrol_op (client) | request | WAIT (handler barrier) | error to client | +| WAL_WORKER_CTRL, detail JOIN/UPDATE | handle_worker_join, do_hostcontrol_op | request | WAIT (handler barrier) | error reply to worker/client | +| WAL_WORKER_CTRL, detail DEAD | controller-detected (worker.c:565/578) | fact | RETAIN | none — retained until committed | +| WAL_JOB_START / FINISH / FAIL / STOP / RESUME / UPDATE / RUSAGE / CKPT / PREASON | worker notify, scheduler preason, postdone, rusage; FAIL/UPDATE also from job_ctrl (request origin → covered by do_jobcontrol_op's handler barrier) | fact | RETAIN | none — retained until committed | +| WAL_NOOP (future) | promotion (ha-single-leader-role) | internal | RETAIN | added downstream; guard forces classification | +| WAL_CHECKPOINT | local checkpoint marker | local-only | LOCAL | unchanged (never replicated, by design) | + +**Responsibilities & Constraints** +- `wal_classify(wal_type, detail)` is a pure lookup; `detail` disambiguates only WAL_WORKER_CTRL (JOIN/UPDATE vs DEAD) +- Hook dispatch: RETAIN → `persist_wal_async` (append + broadcast, the surviving RETAIN fast path) followed by `commit_submit(ce, appended_lsn, COMMIT_MODE_RETAIN, 0)` registration (returns immediately; observability counter). WAIT → WAL_JOB_SUBMIT keeps `persist_wal_sync_append`; other WAIT types append via `persist_wal_async` and completion is owed by the handler barrier (placement decision, Architecture) +- Unclassified guard: under `XCE_TESTING`, `assert(0)` with the offending type logged; in production, `ERROR` log + RETAIN treatment (never dropped, never falsely confirmed) (2.2) +- Fact appends never return commit errors to their callers — `persist_job_hook_fun`'s non-submit return value stays the local-append rc only (3.1) + +**Dependencies** +- Inbound: hook system (HOOK_AFTER_EVENT) — all state-changing writes (P0) +- Outbound: `commit_submit` (P0); `persist_wal_async`/`persist_wal_sync_append` (P0) + +**Contracts**: Service [x] + +##### Service Interface +```c +/* src/include/persist.h */ +typedef enum { + WAL_MODE_WAIT, /* request-shaped: barrier before requester reply */ + WAL_MODE_RETAIN, /* fact-shaped: retained until committed, no timeout */ + WAL_MODE_LOCAL, /* not replicated (WAL_CHECKPOINT) */ +} wal_commit_mode_t; + +/* Pure classification lookup. detail disambiguates WAL_WORKER_CTRL only. + * Unknown type: XCE_TESTING assert; production returns WAL_MODE_RETAIN + * after ERROR log. */ +wal_commit_mode_t wal_classify(uint32_t wal_type, int detail); +``` +- Preconditions: called at the hook seam with the type produced by `detail_to_wal_type` +- Postconditions: total over all `wal_entry_type` values; deterministic +- Invariants: no WAL append path bypasses classification + +### Commit Barrier Helper (`persist.c`, declared in `src/include/persist.h`) + +| Field | Detail | +|-------|--------| +| Intent | Give request handlers a single call realizing commit_submit(WAIT) on everything their mutation appended | +| Requirements | 1.1, 1.2, 1.3 | + +**Responsibilities & Constraints** +- Snapshot `lsn = p->current_lsn` (under `p->lock`, matching `persist_wal_sync_append`'s read at persist.c:1019-1021); if `committed_lsn >= lsn` already, return 0 without blocking +- Delegate to `commit_submit(ce, lsn, COMMIT_MODE_WAIT, timeout_ms ? timeout_ms : p->config.sync_timeout_ms)`; return its code unmodified (0 / `-ETIMEDOUT` / `-XCE_ERR_NOT_READY`) +- Single-writer + contiguous advancement ⇒ the snapshot covers every entry the calling operation produced; over-waiting on unrelated concurrent entries is accepted (bounded by the timeout; they must commit anyway). `n_peers <= 1` returns 0 immediately (engine self-quorum, standalone behavior preserved) +- Must be called only from vtask threads after entity locks are released; counts against the engine's admission cap (deliberate CP back-pressure) +- Migration completion: with all request paths on the engine (directly or via this helper), the walAck legacy counting in `repl_wait_majority_ack` is removed (upstream marked it "retired by ha-commit-barrier-rollout"); the configAck branch remains the config track's mechanism + +**Contracts**: Service [x] + +##### Service Interface +```c +/* src/include/persist.h */ +/* Block until committed_lsn covers everything appended so far. + * timeout_ms = 0 → p->config.sync_timeout_ms. + * Returns 0 (committed), -ETIMEDOUT (not committed in time — entry + * remains in log; outcome converges per umbrella 2.5, owned downstream), + * -XCE_ERR_NOT_READY (admission cap / own-term gate, retriable). */ +int persist_commit_barrier(persist_t *p, uint32_t timeout_ms); +``` +- Preconditions: commit engine wired (`cluster_init` phase, upstream); vtask thread; no entity locks held +- Postconditions: returns 0 ⇔ `committed_lsn >=` the snapshot watermark +- Invariants: never sends replies, never mutates state + +### Reply-Ordering Sweep (`job.c`, `queue.c`, `worker.c`, `join.c`) + +| Field | Detail | +|-------|--------| +| Intent | Enforce the umbrella Reply-Ordering Contract at every control-path reply site | +| Requirements | 1.1, 1.2, 1.3, 1.4, 2.3, 2.4 | + +**Responsibilities & Constraints** +- Restructure pattern (uniform): `rc = (...); if (rc == 0) rc = persist_commit_barrier(&c->persist, 0); reply.status = rc; xce_reply(...)`. Applies to: + - `do_jobcontrol_op` (job.c:921-934) — covers the not-started branch's WAL_JOB_UPDATE/WAL_JOB_FAIL entries; the running-job branch (forward to worker, no local entry) waits on an already-covered watermark and returns immediately + - `do_queuecontrol_op` (queue.c:119-132) + - `do_hostcontrol_op` (worker.c:689-702) + - `handle_worker_join` (join.c:33-119) — barrier inserted between the AFTER_EVENT hook (join.c:104-105) and the success reply (join.c:107-109); error replies (validate_host, hostconfig, idx < 0) stay immediate; `on_worker_join` dataex push stays after the reply +- Receipt-ACK verdicts (verified, kept, classification-guard-enforced): `handle_jobdispatch` (job.c:459-491) — early reply at job.c:466-471 is ACK-of-receipt; `dispatch_a_job_` produces no WAL entries (allocation results return via `notify_dispatch`, and resulting job-state changes arrive later as worker facts) → per the umbrella contract the early reply stands (2.3). `do_set_preason`/`do_clr_preason` (job.c:1040/1068) — scheduler-origin facts (WAL_JOB_PREASON, RETAIN); early reply is receipt-only. `do_update_op` paths (opupd.c) — worker-origin facts (rusage → WAL_JOB_RUSAGE/WAL_JOB_UPDATE RETAIN; resvals produce no WAL); replies are receipt-only +- Exhaustive audit (2.4): every `xce_reply` call site under src/controller/ (excluding testsuite) is enumerated by grep and assigned one of {post-commit confirmation, receipt-only ACK, read-only/replication/error reply}; the audit table is committed with the task evidence. Known control-path population at design time: job.c:471,524,569,578,932,1050,1078; queue.c:130; worker.c:700; join.c:28,54,66,109,139,152,198,225,248,257,283; opupd.c:48,64,88; cluster.c (gate/shutdown/hello/notify-path replies); config_repl.c:619-1129 (config/replication track); ha.c:1035; opget.c:222 (read-only); reply.c:61; task.c:97 — line numbers re-verified by grep during implementation +- A missed handler silently violates umbrella 2.1 — the integration test asserting no-success-reply-before-commit is the behavioral backstop (1.4) + +**Contracts**: Service [x] — external reply semantics: success now implies majority durability; new error codes `-ETIMEDOUT`/`-XCE_ERR_NOT_READY` surface to requesters through existing reply envelopes (Go tier passes them through, per umbrella out-of-boundary) + +**Implementation Notes** +- Integration: handlers run on vtask threads (cluster.c dispatch switch at cluster.c:325-363) — barrier blocking is steering-compliant +- Validation: integration test drives each restructured opcode against a 3-node-simulated registry with ACKs withheld → error reply, `committed_lsn` unmoved; with ACKs → success reply strictly after commit +- Risks: scheduler/worker callers seeing new timeout errors where they previously saw instant success — deliberate CP behavior (umbrella); retry semantics unchanged on their side + +### Fact Gate Admission (`ha.c`) +Summary-only: add `OPCode_notify`, `OPCode_update`, `OPCode_setpreason`, `OPCode_clrpreason` to the CTRL_PRIMARY no-write-quorum allowlist in `ha_dispatch_gate` (ha.c:1537-1556) so reported facts reach the RETAIN path during quorum loss (3.2 — closes the bug-396 silent-loss hole; umbrella error strategy: "fact-shaped ops are still appended and retained"). Request-shaped opcodes (jobsub, jobcontrol, queuecontrol, hostcontrol, jobdispatch, join) remain rejected without quorum. The CTRL_PRIMARY_COMMITTING branch is intentionally untouched (deleted wholesale by ha-single-leader-role — known residual until then). Quorum accounting itself is out of boundary (upstream). + +### Config Barrier (`config_repl.c`, `repl.c` configAck branch) + +| Field | Detail | +|-------|--------| +| Intent | Make the config majority-ACK result authoritative for the upgrade outcome | +| Requirements | 4.1, 4.2, 4.3, 4.4 | + +**Responsibilities & Constraints** +- `push_config_to_standbys` (config_repl.c:866-930) signature: `int push_config_to_standbys(cluster_t *c, const uint8_t *bytes, size_t blen, const uint8_t sha256[32], uint64_t new_tag, int *acked_out)` — returns the barrier result (0 / `-ETIMEDOUT`), push count via `acked_out`. The majority wait (config_repl.c:916-917) passes `new_tag` down for per-push evaluation; `committed_config_tag` advance stays inside the success branch only (config_repl.c:918-922 — 4.3 preserved) +- configAck branch of `repl_wait_majority_ack` (repl.c:418-438) hardened to mirror the engine's rules on the config track (umbrella: "same majority arithmetic, parallel simpler track"): count standbys with `acked_config_lsn >= push_tag` (not `> 0` — a previous upgrade's ack no longer counts), majority = `1 (self) + count > n_peers / 2` over configured members (not `n_active`), `n_peers <= 1` → immediate success, `n_peers > 1` with zero covering acks → `-ETIMEDOUT` at deadline (the `n_active == 0 → success` short-circuit is removed from this branch). The configAck branch reuses the `entry_lsn` parameter already added to `repl_wait_majority_ack` by ha-commit-engine as the config push tag — no second parameter is added (`repl.h` comment updated accordingly); the function is now configAck-only (walAck callers are on the engine) +- Caller `do_upgrade_config_with_bytes` (config_repl.c:1056-1094): on non-zero return — `send_upgrade_error(ep, req, c, ...)` to the admin tool (4.2), skip the success ACK, skip `restart_requested` (4.4). Disk save and generation bump have already happened (pre-existing sequence); the reply makes the failure explicit and the cluster-wide tag stays uncommitted — convergence/rollback of a half-pushed config remains the existing OP_replConfig anti-entropy behavior (out of boundary) +- One in-flight config change at a time (umbrella-locked) — no per-entry registry needed + +**Contracts**: Service [x] — `upgradeConfig` reply contract: success ⇔ majority-acked config; failure carries an error string and implies no restart + +**Implementation Notes** +- Integration: `CONF_PUSH_TIMEOUT_MS` remains the config commit timeout +- Validation: integration test withholds configAcks → admin reply is an error, `committed_config_tag` unmoved, no restart request; with acks → success and tag advanced +- Risks: admin tooling that treated any reply as success must observe `status` — existing CLI already surfaces reply status (admin-config-tool backlog item consumes this contract) + +### Idempotency Guards (`job.c`) + +| Field | Detail | +|-------|--------| +| Intent | Make job state transitions safe under duplicate, out-of-order, and replayed application | +| Requirements | 5.1, 5.2, 5.3 | + +**Responsibilities & Constraints** +- Guard placement: at the top of `mark_job_start` (job.c:583), `mark_job_finish` (job.c:638), `mark_job_fail` (job.c:696), `mark_job_update` (job.c:726), under the caller-held job WRITE lock, before the BEFORE_EVENT hook fires (a guarded-out transition runs no hooks → no WAL entry, no double-fire) +- Rules (terminal = any of DONE | EXIT, with or without PERR/PDONE modifiers): + - duplicate: requested resulting state == current state → INFO log, return 0, no mutation, no hooks (5.1) + - backward: current state terminal AND requested state non-terminal (START on finished job, UPDATE clearing terminal bits) → WARN log, return `-EALREADY`-style rejection, state preserved (5.2) + - forward/normal: proceed unchanged; `mark_job_fail`'s existing post-exec special case (job.c:702-716) already tolerates fail-after-finish and is kept as the terminal-state-compatible path +- Replay equivalence (5.3): guards make `restore_job_state`-driven re-application and RETAIN retry converge to single-application state; callers (`on_job_*`, `job_ctrl`) treat the duplicate code as success-no-op +- Shared prerequisite of worker-rejoin-resync (umbrella adjacent expectation) — guards live here, resync consumes them later + +**Contracts**: Service [x] — `mark_job_*` return contract gains the logged no-op/rejection outcomes; all existing callers checked during the sweep + +## Data Models + +### Domain Model (changes only) +- **wal_commit_mode_t** — new enum (persist.h); pure classification metadata, never persisted +- **WAL entries, job_t, queue_t, worker_t** — no format or field changes in this spec (`submit_lsn` tagging is ha-convergence-recovery's egress filter, not here) +- Invariants: every appended state-changing entry is classified; a success reply to a request-shaped operation implies `committed_lsn >=` all entries that operation appended; `committed_config_tag` advances only on per-push config majority; job state never transitions terminal → non-terminal + +## Error Handling + +### Error Strategy +- Request-shaped commit failure: `-ETIMEDOUT` / `-XCE_ERR_NOT_READY` propagate to the requester reply via the existing `errnox` early-return pattern; no in-memory rollback (provisional model, umbrella-locked; convergence owned downstream) +- Fact-shaped paths never surface commit errors to reporters: local append failure (disk) keeps its existing ERROR logging; commit progress is the engine's concern (RETAIN) +- Unclassified WAL type: XCE_TESTING assert (fail fast in CI); production ERROR + RETAIN fallback (2.2 — fail-safe toward retention, never silent confirmation) +- Config failure: explicit error reply via `send_upgrade_error`; no restart; WARN with tag and acked count +- Guard rejections: INFO (duplicate) / WARN (backward) with jobid and both states — log-once per application, no log storms + +### Monitoring +- Retained-uncommitted depth (committed-vs-appended lag) — engine counter, consumed in logs here for fact-backlog visibility +- Per-handler barrier failures WARN with opcode and rc; config barrier WARN already present (config_repl.c:924-926), now coupled to the failed reply + +## Testing Strategy + +### Unit Tests (`testsuite/test_commit_barrier_rollout.c`, XCE_TESTING) +- Classification totality: every `wal_entry_type` value maps to a mode; WAL_WORKER_CTRL detail split (JOIN/UPDATE → WAIT, DEAD → RETAIN); unknown type asserts under XCE_TESTING (2.1, 2.2) +- Barrier helper: returns 0 immediately when `committed_lsn` covers the watermark; `-ETIMEDOUT` with ACKs withheld and `committed_lsn` unmoved; 0 after covering ACK; `n_peers <= 1` immediate success (1.1, 1.2, 1.3) +- Idempotency guards: duplicate FINISH → state unchanged, rc = no-op, no AFTER hook fired (no WAL entry); START on DONE job → rejected, WARN, state preserved; double application of a transition equals single application; fail-after-finish keeps existing PERR behavior (5.1, 5.2, 5.3) +- configAck arithmetic: stale `acked_config_lsn` from a previous tag does not count; zero covering acks with n_peers=3 → timeout; majority with self-count → 0; n_peers=1 → immediate (4.1, 4.3) + +### Integration Tests (testsuite/) +- No-success-reply-before-commit: for each restructured opcode (jobcontrol, queuecontrol, hostcontrol, worker join), with ACKs withheld the reply is an error and arrives only at/after the timeout; with ACKs the success reply is observable only after `committed_lsn` covers the operation's entries (1.1, 1.2, 1.4) +- Fact retention across quorum loss: simulate quorum loss → notify-driven transitions still append (RETAIN, no error), gate admits the fact opcodes; restore ACKs → entries commit without re-delivery (3.1-3.4) +- Dispatch receipt-ACK: handle_jobdispatch still replies immediately; no WAL entry is produced by dispatch processing itself (classification assert clean) (2.3) +- Config barrier: upgradeConfig with withheld configAcks → error reply to requester, `committed_config_tag` unmoved, no restart requested; with acks → success, tag advanced (4.1-4.4) +- Reply-site audit (2.4): scripted grep over all `xce_reply` call sites in control paths, each assigned a category; zero unclassified sites + +### Regression +- Full controller testsuite + ASAN (`/xce-build controller`) green; existing job-submit barrier tests (upstream) unaffected; `test_repl_majority.c` configAck cases updated to the hardened per-push arithmetic + +## Performance & Scalability +- Request-control latency gains one majority RTT (the same cost job submit already pays); fact paths gain no latency (RETAIN returns immediately) +- Concurrent blocked handlers are bounded by the engine's `n_vcpus`-relative admission cap (upstream); excess load degrades to fast NOT_READY rejections — deliberate CP +- Barrier over-wait on concurrent unrelated entries is bounded by `sync_timeout_ms` and only occurs while uncommitted traffic is pending + +## Migration Strategy +This spec is phase 2 of the umbrella's hard-ordered landing ("barrier before state removal"): +1. Classification + RETAIN registration + barrier helper (no behavior change for replies yet) +2. Handler restructure sweep + fact gate admission (reply semantics switch on) +3. Config barrier error propagation; legacy walAck counting retirement; idempotency guards +Each step leaves the system no less consistent than before it; rollback trigger per step: controller testsuite regression or job-control E2E failure. ha-single-leader-role must not land until the sweep (step 2) is complete and audited. diff --git a/.kiro/specs/ha-commit-barrier-rollout/requirements.md b/.kiro/specs/ha-commit-barrier-rollout/requirements.md new file mode 100644 index 0000000..67fa1eb --- /dev/null +++ b/.kiro/specs/ha-commit-barrier-rollout/requirements.md @@ -0,0 +1,92 @@ +# Requirements Document + +> Sub-spec 2 of 4 implementing the **ha-consistency-invariants** umbrella contract. +> The umbrella documents (`.kiro/specs/ha-consistency-invariants/requirements.md`, `design.md`, `research.md`) are the authoritative contract. This document restates the slice owned by this spec — umbrella criteria 2.1 (all operation types), 2.2, 2.8, 5.1, 5.2, 5.3 — as this spec's own numbered requirements. Each criterion notes its umbrella ID; the traceability table at the end gives the full mapping. Locked umbrella decisions (log-is-the-queue for facts, commit-first-then-reply for all request-shaped operations, crash-loss of uncommitted facts accepted until worker-rejoin-resync) are restated, never re-derived. + +## Project Description (Input) + +Only WAL_JOB_SUBMIT goes through a commit barrier today. Job state changes, queue control, and worker control apply locally with fire-and-forget replication; job/queue/worker control handlers reply to their requesters before any durability is established; config push ignores its majority-ACK result and confirms the upgrade to the admin tool regardless; worker-reported facts are silently lost when the dispatch gate rejects them (bug-396 family); and `mark_job_*` transitions have no idempotency guards, so duplicate or replayed application corrupts state. Cluster operators need every state-changing operation routed per the umbrella design's write-path classification table: request-shaped operations confirm to their requester only after majority commit (validate → mutate provisional → append → commit barrier → reply) and fail to the requester on commit timeout; fact-shaped operations are appended and retained until committed with no timeout — never dropped while the primary runs and leads; configuration upgrades fail to the requester on missed majority; and fact transitions are idempotent and ordered so retry/replay is safe. This spec consumes the commit engine delivered by ha-commit-engine (commit_submit WAIT/RETAIN) and never modifies the engine's internals. + +## Introduction + +This spec delivers the barrier-rollout slice of the umbrella contract. After this spec, every cluster-state-changing operation on the primary participates in the majority-commit contract: a requester (client, scheduler, worker, or admin tool) that receives a success reply is guaranteed the operation is durable on a majority of cluster members; a requester whose operation cannot reach majority within the commit timeout receives an error; and reported facts with no requester awaiting confirmation are retained in the log and retried until committed — including across quorum-loss periods. The write path enforces this through an exhaustive classification of WAL entry types: a state-changing entry type that is not classified cannot silently bypass the barrier. Configuration changes follow the same contract on their own track. Job state transitions become idempotent and ordered so that retained-fact retry, replay, and the future worker-rejoin-resync can re-apply them safely. + +## Boundary Context + +- **In scope**: The write-path classification table and its dispatch at the persistence seam (with a fail-fast guard for unclassified types); commit-first-then-reply restructuring of every request-shaped control handler (job control, queue control, worker control, worker join/update) and verification of every control-path reply site; classification verdict for the scheduler dispatch acknowledgment; RETAIN routing for fact-shaped WAL types, including acceptance of reported facts during quorum loss; configuration-change commit-barrier error propagation to the upgrade requester; idempotency and ordering guards for job state transitions; integration tests proving no success reply is observable before commit and that facts survive quorum-loss periods. +- **Out of scope**: The commit engine itself — per-LSN evaluation, admission cap, `committed_lsn` advancement (ha-commit-engine, consumed as-is); promotion no-op, own-term gate consumers, and CTRL_PRIMARY_COMMITTING removal (ha-single-leader-role — must land after this spec); demotion truncate+restart, rejoin reconciliation, egress watermark filter, ACK-driven catch-up, quorum-transition logging (ha-convergence-recovery); worker protocol changes of any kind — facts that never reached the controller, or that died with it across failover, are recovered only by worker-rejoin-resync (roadmap backlog, designated backstop); election and vote correctness (raft-library); replication wire format and standby apply mechanics (ha-wal-replication). +- **Adjacent expectations**: Upstream, this spec consumes the `commit_submit` WAIT/RETAIN service interface and the quorum-accounting fixes delivered by ha-commit-engine; changes to that interface require revalidation here. Downstream, ha-single-leader-role depends on this spec having placed the barrier on all write paths before the transitional leader state is removed (hard ordering), and worker-rejoin-resync shares the idempotency guards introduced here. Crash-loss of facts that were appended but not yet committed when the primary process dies is accepted until worker-rejoin-resync lands (umbrella-locked decision). + +## Requirements + +### Requirement 1: Commit-First-Then-Reply for Request-Shaped Operations + +**Objective:** As a cluster operator, I want every operation with a requester awaiting confirmation to be confirmed only after its log entries are durable on a majority of cluster members, so that no acknowledged change can be lost by a single node failure or failover. + +#### Acceptance Criteria + +1. When the primary receives a request-shaped cluster-state-changing operation (job control, queue control, worker control, worker join, or worker update), the primary shall send a success reply to the requester only after every log entry produced by the operation has been acknowledged by a majority of cluster members, counting itself. *(umbrella 2.1)* +2. If majority acknowledgment for a request-shaped operation is not obtained within the configured commit timeout, the primary shall reply to that requester with an error reporting the operation as failed. *(umbrella 2.2)* +3. If the commit barrier rejects a request-shaped operation without waiting (cluster not ready to commit), the primary shall reply to the requester with the corresponding error, never with success. *(umbrella 2.2)* +4. While the log entries produced by a request-shaped operation are not yet committed, the primary shall not emit any reply that the requester can interpret as confirmation of that operation. *(umbrella 2.1)* + +### Requirement 2: Complete Write-Path Classification + +**Objective:** As a cluster operator, I want every state-changing entry type explicitly classified as request-shaped or fact-shaped at the write path, so that no operation type can silently bypass the commit contract. + +#### Acceptance Criteria + +1. The controller shall route every state-changing log entry type through the commit engine under an explicit classification: request-shaped types complete through the commit barrier before requester confirmation, and fact-shaped types are retained until committed. *(umbrella 2.1, 2.8)* +2. If a state-changing log entry type with no classification reaches the write path, the controller shall fail fast at that point in testing builds; in production builds it shall log an error and treat the entry as fact-shaped, never dropping it and never confirming it early. *(umbrella 2.1)* +3. When the scheduler delivers a job dispatch message, the primary's immediate acknowledgment shall constitute only receipt of the message; per-job dispatch outcomes shall continue to be delivered through the existing per-job notifications, and the receipt acknowledgment shall not confirm any state-changing log entry. *(umbrella 2.1)* +4. The controller shall contain no control-path reply site that confirms a request-shaped state-changing operation before its entries are committed; every control-path reply site shall be either a post-commit confirmation or a receipt-only acknowledgment for fact-shaped deliveries. *(umbrella 2.1)* + +### Requirement 3: Fact Retention — Log Is the Queue + +**Objective:** As a cluster operator, I want reported facts that have no requester awaiting confirmation to be retained and retried until committed, so that a quorum-loss window never silently erases what actually happened on the cluster. + +#### Acceptance Criteria + +1. When the primary receives a reported fact with no requester awaiting confirmation (a worker-reported job state transition, worker-reported resource usage, scheduler-reported pending reason, or controller-detected worker death), the primary shall append the fact to its log and continue attempting commitment until the fact's entry is committed, with no commit timeout. *(umbrella 2.8)* +2. While the primary cannot reach a majority of cluster members, when a reported fact arrives, the primary shall accept and append the fact rather than rejecting it. *(umbrella 2.8)* +3. While the primary remains running and holds leadership, the primary shall not discard an uncommitted reported fact. *(umbrella 2.8)* +4. When majority connectivity is restored, the primary shall bring previously appended uncommitted facts to committed state without requiring redelivery from the original reporter. *(umbrella 2.8)* + +### Requirement 4: Configuration Change Commit Barrier + +**Objective:** As a cluster operator, I want configuration changes to follow the same majority-commit contract as other state changes, so that a failover never reverts a configuration upgrade that was reported as successful. + +#### Acceptance Criteria + +1. When the primary distributes a configuration change, the primary shall confirm the change to its requester only after a majority of cluster members have acknowledged it. *(umbrella 5.1)* +2. If majority acknowledgment for a configuration change is not obtained within the configured commit timeout, the primary shall report the configuration change as failed to its requester. *(umbrella 5.2)* +3. If a configuration change has not achieved majority acknowledgment, the primary shall not mark that configuration as committed. *(umbrella 5.3)* +4. If a configuration change was reported as failed to its requester, the primary shall not proceed with the restart that activates the new configuration. *(umbrella 5.2)* + +### Requirement 5: Idempotent and Ordered Fact Application + +**Objective:** As a cluster operator, I want job state transitions to be safe under duplicate and replayed application, so that retained-fact retry, log replay, and future worker rejoin re-synchronization cannot corrupt job state. + +#### Acceptance Criteria + +1. When a job state transition that is already reflected in the job's current state is applied again, the controller shall leave the job's state unchanged and record the duplicate application in its log. *(umbrella 2.8)* +2. If a job state transition would move a job from a terminal state back to a non-terminal state, the controller shall reject the transition, preserve the terminal state, and log a warning. *(umbrella 2.8)* +3. When a fact's log entry is applied more than once through retry or replay, the resulting job state shall equal the state produced by exactly one application. *(umbrella 2.8)* + +## Umbrella Traceability + +| This spec | Umbrella ID | Notes | +|-----------|-------------|-------| +| 1.1, 1.4 | 2.1 | Commit-first-then-reply generalized from job submit to all request-shaped operation types | +| 1.2, 1.3 | 2.2 | Requester-awaiting operations fail on commit timeout / not-ready, never silently degrade | +| 2.1 | 2.1, 2.8 | Classification table is the enforcement mechanism for "all operation types" | +| 2.2 | 2.1 | Fail-fast guard: a new/unclassified WAL type cannot silently bypass the barrier (umbrella revalidation trigger) | +| 2.3 | 2.1 | handle_jobdispatch classification per the umbrella Reply-Ordering Contract (receipt-ACK verdict, task-verified) | +| 2.4 | 2.1 | Exhaustive reply-site sweep; a missed handler silently violates umbrella 2.1 | +| 3.1, 3.3 | 2.8 | Log-is-the-queue: RETAIN mode, no timeout, retry until committed (umbrella-locked decision) | +| 3.2 | 2.8 | Facts accepted across quorum-loss periods (closes the bug-396 silent-loss hole) | +| 3.4 | 2.8 | Commitment resumes from the retained log suffix, not from reporter redelivery | +| 4.1 | 5.1 | Config change confirmed only after majority ACK | +| 4.2, 4.4 | 5.2 | Config change fails to requester on timeout; restart sequencing gated on the barrier (roadmap residual) | +| 4.3 | 5.3 | committed_config_tag advances only on majority ACK | +| 5.1, 5.2, 5.3 | 2.8 | Idempotency guards make RETAIN retry/replay safe; shared prerequisite of worker-rejoin-resync | diff --git a/.kiro/specs/ha-commit-barrier-rollout/research.md b/.kiro/specs/ha-commit-barrier-rollout/research.md new file mode 100644 index 0000000..a921350 --- /dev/null +++ b/.kiro/specs/ha-commit-barrier-rollout/research.md @@ -0,0 +1,108 @@ +# Research & Design Decisions: ha-commit-barrier-rollout + +## Summary +- **Feature**: `ha-commit-barrier-rollout` (sub-spec 2 of 4, ha-consistency-invariants umbrella) +- **Discovery Scope**: Extension (light discovery — umbrella research.md is the primary discovery artifact; this pass verified its anchors against the current tree, 2026-06-11) +- **Key Findings**: + - Every reply-before-commit call site named by the umbrella still exists; line anchors re-verified (table below) + - Call-site verification of the umbrella classification table found two deviations the umbrella anticipated ("verified against call sites during implementation; table is the contract"): WAL_JOB_STOP/RESUME are fact-origin only, and WAL_JOB_UPDATE (absent from the umbrella table) is dual-origin + - The configAck branch of `repl_wait_majority_ack` has the same three counting defects the commit engine fixed for walAck (`> 0` counting, `n_active == 0 → success`, `n_active` denominator) + - The dispatch gate rejects `OPCode_notify` (and update/preason) under quorum loss — the bug-396 silent fact-loss hole is gate-level, not just replication-level + +## Verified Code Anchors (2026-06-11, persistent_ha working tree) + +| Concern | Anchor (verified by grep/read) | Status vs umbrella audit | +|---|---|---| +| do_jobcontrol_op replies after mutation, async WAL only | job.c:921-934 (reply at 932) | unchanged | +| handle_jobdispatch early reply | job.c:459-491 (reply at 466-471) | umbrella cited 459-471 — still accurate | +| handle_jobsubmit reference implementation | job.c:495-581 (hook rc checked 563-571, reply 573-578) | umbrella cited 563-578 — still accurate | +| do_queuecontrol_op | queue.c:119-132 (reply at 130); queue_ctrl fires AFTER hook under queue WRITE lock (queue.c:76-112, hook at 107) | new precision: lock-scope drives WAIT placement | +| do_hostcontrol_op | worker.c:689-702 (reply at 700) | new anchor | +| handle_worker_join | join.c:33-119 (AFTER hook 104-105, success reply 107-109) | new anchor | +| do_set_preason / do_clr_preason early replies | job.c:1040-1066 (reply at 1050) / job.c:1068+ (reply at 1078) | scheduler-origin facts — receipt-ACK verdict | +| do_update_op family | opupd.c:48/64/88 reply sites | worker-origin facts — receipt-ACK verdict | +| do_notify (no reply, fire-and-forget) | cluster.c:118-157 | unchanged | +| Hook → WAL type map | persist.c:1068-1088 (`detail_to_wal_type`) | classification dispatch insertion point | +| Job hook: submit sync path / fact async path | persist.c:1093-1169 (sync 1107-1129, async 1169) | unchanged | +| Queue / worker hooks (async) | persist.c:1172-1202 (append 1199) / persist.c:1204-1244 (append 1241) | unchanged | +| persist_wal_sync_append + timeout | persist.c:1003-1049; timeout `p->config.sync_timeout_ms` (DEFAULT_SYNC_TIMEOUT_MS=50, config.h:93) | committed_lsn store at 1035-1036 is removed by ha-commit-engine (upstream) | +| Dispatch gate PRIMARY no-quorum allowlist | ha.c:1527 (`ha_dispatch_gate`), allowlist 1537-1556; notify falls to `default → -XCE_ERR_NOT_READY` | fact admission insertion point | +| push_config_to_standbys ACK result ignored | config_repl.c:866-930 (wait at 916-917, rc logged-only 918-927, returns acked at 929) | umbrella cited 916-928 — still accurate | +| upgradeConfig caller ignores result | config_repl.c:1056-1094 (push at 1057, unconditional success ACK 1062-1073, restart 1091-1093) | umbrella cited 1057 — still accurate | +| configAck counting defects | repl.c:386-462 (`acked_config_lsn > 0` at 422-424, `n_active==0 → success` at 432-435, denominator `n_active` at 437) | mirrors the walAck defects fixed upstream | +| repl_on_config_ack stores reported tag/lsn | repl.c:351-371; `standby_conn_t.acked_config_lsn` (repl.h:25) | enables per-push `>= push_tag` comparison | +| mark_job_start/finish/fail/update unguarded | job.c:583/638/696/726 | unchanged | +| job_ctrl branches | job.c:306-438 — running job forwards to worker (357, no local entry); not-started job mutates via mark_job_update (391/401) / mark_job_fail (415) | classification evidence (deviation §2) | +| dispatch_a_job_ produces no WAL | job.c:180-304 — sends xce_startjob_req, mutates j->job.allocs, fires no hooks | handle_jobdispatch receipt-ACK evidence | +| WAL type enum | src/include/wal_types.h:44-58 (no WAL_NOOP yet) | WAL_NOOP arrives with ha-single-leader-role | +| Control-path xce_reply population | job.c:471,524,569,578,932,1050,1078; queue.c:130; worker.c:700; join.c:28,54,66,109,139,152,198,225,248,257,283; opupd.c:48,64,88; cluster.c:255-490; config_repl.c:619-1129; ha.c:1035; opget.c:222; reply.c:61; task.c:97 | sweep-task input; re-grep before editing | +| Opcode → handler dispatch | cluster.c:325-363 (jobsub/jobdispatch/notify/update/jobcontrol/queuecontrol/hostcontrol/setpreason/clrpreason/join) | gate allowlist + sweep scoping | + +Upstream interface consumed (ha-commit-engine design, generated 2026-06-11): `commit_submit(ce, lsn, COMMIT_MODE_WAIT|RETAIN, timeout_ms)` → 0 / -ETIMEDOUT / -XCE_ERR_NOT_READY; RETAIN returns immediately; n_peers<=1 self-quorum; admission cap n_vcpus-relative; engine embedded in `cluster_t`, reachable from `persist_t` via `p->repl.ce`. `commit.c`/`commit.h` do not exist in the tree yet — ha-commit-engine must be implemented first (hard upstream dependency; tasks assume its interface as specified). + +## Research Log + +### §1 Reply-ordering reality and the WAIT placement question +- **Context**: The umbrella Reply-Ordering Contract fixes the handler sequence (validate → mutate → append → commit_submit(WAIT) → reply). Where should the WAIT physically run — inside the persistence hook (like job submit) or in the handler? +- **Findings**: queue/worker/job-state hooks fire while the entity WRITE lock is held (queue.c:107 inside lock taken at 76; mark_job_* called under job WRITE lock, e.g. job.c:629-631). Job submit is the exception: its AFTER hook runs against a job list after per-job locks are released (job.c:553), which is why its in-hook sync wait is safe. +- **Implications**: In-hook WAIT for queue/worker/job-control would block entity readers for up to the commit timeout. Handler-level barrier (after locks released, before reply) keeps the same completion semantics and matches the umbrella's handler-sequence wording. Decision below. + +### §2 Classification table call-site verification (umbrella-mandated) +- **Context**: Umbrella table marks WAL_JOB_STOP/RESUME as "request (client job control) → WAIT" and omits WAL_JOB_UPDATE. +- **Findings**: WAL_JOB_STOP/RESUME entries are appended only by `on_job_stop`/`on_job_resume`, reachable solely from `do_notify` (worker-reported stoppedJob/resumedJob facts — cluster.c:131-136). Client job control (`do_jobcontrol_op` → `job_ctrl`) never produces them: for a running job it forwards the signal to the worker (job.c:357) and the resulting transition comes back later as a worker fact; for a not-yet-started job it mutates locally through `mark_job_update` (WAL_JOB_UPDATE) or `mark_job_fail` (WAL_JOB_FAIL). WAL_JOB_UPDATE/WAL_JOB_FAIL are therefore dual-origin (request via job_ctrl, fact via postdone/notify/rusage). +- **Implications**: Classify STOP/RESUME/UPDATE/FAIL as fact/RETAIN at the seam; realize the umbrella's request-shaped guarantee ("error to client") for client job control at the handler barrier in `do_jobcontrol_op`. This satisfies the umbrella's intent through its own prescribed handler sequence — the barrier is a property of the handler, not of the entry type. Not a contradiction: the umbrella explicitly delegated call-site verification, and the failure-column behavior is preserved. + +### §3 handle_jobdispatch classification (umbrella left it open) +- **Findings**: `dispatch_a_job_` (job.c:180-304) sends `xce_startjob_req` to the worker and updates `j->job.allocs` in memory; it fires no hooks and appends no WAL entries. Per-job outcomes return to the scheduler via `notify_dispatch` (job.c:440-457, called at 479-486). The job's externally meaningful state change (RUN) arrives later as a worker fact (WAL_JOB_START). +- **Implications**: Per the umbrella's own criterion ("if its outcomes are fact-shaped … the early reply is an ACK-of-receipt and may stand"), the verdict is **receipt-ACK stands** (this spec's Req 2.3). The orphan-dispatch-of-uncommitted-submit race is closed by the egress watermark filter (ha-convergence-recovery), not here. The classification guard plus a no-WAL-from-dispatch test pin the verdict. + +### §4 Fact loss is gate-level too (bug-396 family) +- **Findings**: `ha_dispatch_gate`'s CTRL_PRIMARY branch rejects `OPCode_notify`, `OPCode_update`, `OPCode_setpreason`, `OPCode_clrpreason` with `-XCE_ERR_NOT_READY` whenever write quorum is absent (ha.c:1537-1556 default arm). The worker never reads notify replies (umbrella research §A), so each rejection is a permanently lost fact. +- **Implications**: Umbrella 2.8 ("retain … including across quorum-loss periods") requires admitting these opcodes without write quorum; durability is then owned by RETAIN. Allowlist change is confined to the PRIMARY branch; the COMMITTING branch is left for ha-single-leader-role's wholesale deletion. + +### §5 Config track hardening scope +- **Findings**: configAck counting (repl.c:418-438) shares all three walAck defects; `repl_on_config_ack` already stores the standby's acknowledged tag (repl.c:351-371), so per-push comparison (`>= push_tag`) needs only a parameter, not new state. `committed_config_tag` advance is already success-gated (config_repl.c:918-922). +- **Implications**: Hardening lives in the configAck branch + `push_config_to_standbys` return contract + caller failure path. No engine involvement (umbrella-locked: config is a parallel, simpler track sharing the majority arithmetic rule — one in-flight change at a time). + +## Architecture Pattern Evaluation + +| Option | Description | Strengths | Risks / Limitations | Verdict | +|--------|-------------|-----------|---------------------|---------| +| In-hook WAIT for all request types | extend the job-submit sync-append pattern to queue/worker/job-control hooks | one mechanism, no handler edits | blocks commit waits under entity WRITE locks (readers stall up to timeout); job-control hooks fire per-transition, not per-operation | rejected | +| Handler-level barrier (chosen) | hooks append (RETAIN-registered); request handlers call `persist_commit_barrier()` after locks, before reply | matches umbrella handler sequence verbatim; no lock-hold waits; uniform mechanical sweep pattern; covers dual-origin types from request contexts | barrier watermark may over-wait on unrelated concurrent entries (bounded by timeout) | selected | +| Per-entry LSN plumbing (hooks return entry LSNs to handlers) | exact-entry waits | no over-wait | invasive signature changes through the hook system for negligible benefit (over-wait is bounded and rare) | rejected (YAGNI) | + +## Design Decisions + +### Decision: Handler-level commit barrier on the appended watermark +- **Context**: §1 lock-scope finding vs the umbrella WAIT mode for queue/worker/job-control. +- **Selected Approach**: `persist_commit_barrier(p, timeout_ms)` = snapshot `current_lsn`, `commit_submit(WAIT)` on it; called by each request handler between mutation success and reply. +- **Rationale**: Single-writer appends + contiguous commit advancement (engine postcondition) make the watermark cover everything the operation appended; the umbrella's Reply-Ordering Contract literally specifies the handler sequence. +- **Trade-offs**: Possible over-wait on concurrent unrelated uncommitted entries (bounded by `sync_timeout_ms`; those entries must commit anyway). A no-op control operation may wait behind unrelated traffic — accepted (request-shaped ops are gate-rejected during quorum loss, so the wait resolves quickly in healthy clusters). +- **Follow-up**: Integration test pins reply-after-commit ordering per opcode. + +### Decision: Verified classification deviations (STOP/RESUME fact-only; UPDATE dual-origin) +- See Research Log §2. Umbrella conformance preserved through the handler barrier; the verified table in design.md is the implementation contract. Inline umbrella tags kept (2.1/2.8). + +### Decision: Production fallback for unclassified WAL types = RETAIN +- **Context**: Req 2.2 requires fail-fast in testing; production must not crash the primary on a programmer omission. +- **Selected Approach**: XCE_TESTING assert; production ERROR log + RETAIN treatment. +- **Rationale**: Fail-safe direction is retention (never dropped, never falsely confirmed) — a misrouted request-shaped type degrades to a missing barrier caught by the sweep audit/tests, not to data loss. + +### Decision: Failed config upgrade does not restart +- **Context**: Roadmap residual ("don't restart the primary before the commit barrier passes"); umbrella 5.2. +- **Selected Approach**: `do_upgrade_config_with_bytes` gates the success ACK and `restart_requested` on the barrier result; disk save/generation bump remain pre-barrier (existing sequence), reconciled by the existing OP_replConfig anti-entropy (out of boundary). +- **Trade-offs**: A failed upgrade leaves the new config on the primary's disk but uncommitted cluster-wide; explicit failure to the operator makes the state visible. Full save-after-commit resequencing deferred (would touch checkpoint/restart machinery beyond this slice). + +## Risks & Mitigations +- Missed reply site silently violates umbrella 2.1 — exhaustive grep audit task over all `xce_reply` sites + behavioral integration test (no success reply before commit) +- Upstream ha-commit-engine not yet implemented — tasks consume only its published interface; if signatures drift, revalidation trigger fires (boundary section) +- New timeout errors surfacing to scheduler/worker/CLI callers — deliberate CP semantics (umbrella); error codes flow through existing reply envelopes; callers' retry behavior unchanged +- Guard rejections changing `mark_job_*` return codes — sweep checks all callers treat duplicate-as-success-no-op + +## References +- `.kiro/specs/ha-consistency-invariants/{requirements,design,research}.md` — authoritative umbrella contract (esp. design §Write-Path Classification, §Config Barrier, §Idempotency Guards; research locked decisions 1, 2, 4) +- `.kiro/specs/ha-commit-engine/design.md` — consumed engine interface (commit.h verbatim), migration note "retired by ha-commit-barrier-rollout" +- `.kiro/steering/roadmap.md` — dependency ordering; superseded item "Quorum-ACK gate before config restart" residual +- `.kiro/steering/ha-async-io.md`, `testing.md`, `error-handling.md` — threading, TDD, errnox conventions +- Raft paper §5.3 (commit rule) — via umbrella; this spec adds no new consensus logic diff --git a/.kiro/specs/ha-commit-barrier-rollout/spec.json b/.kiro/specs/ha-commit-barrier-rollout/spec.json new file mode 100644 index 0000000..29d5529 --- /dev/null +++ b/.kiro/specs/ha-commit-barrier-rollout/spec.json @@ -0,0 +1,23 @@ +{ + "feature_name": "ha-commit-barrier-rollout", + "created_at": "2026-06-11T09:20:51Z", + "updated_at": "2026-06-11T09:45:00Z", + "language": "en", + "phase": "tasks-generated", + "umbrella": "ha-consistency-invariants", + "approvals": { + "requirements": { + "generated": true, + "approved": true + }, + "design": { + "generated": true, + "approved": true + }, + "tasks": { + "generated": true, + "approved": true + } + }, + "ready_for_implementation": true +} diff --git a/.kiro/specs/ha-commit-barrier-rollout/tasks.md b/.kiro/specs/ha-commit-barrier-rollout/tasks.md new file mode 100644 index 0000000..01f8d5f --- /dev/null +++ b/.kiro/specs/ha-commit-barrier-rollout/tasks.md @@ -0,0 +1,106 @@ +# Implementation Plan: ha-commit-barrier-rollout + +> TDD ordering per project steering (`testing.md`): every implementation sub-task is preceded by a testsuite sub-task that lands failing (RED) tests first. New tests live in `testsuite/test_commit_barrier_rollout.c` plus targeted updates to `test_repl_majority.c` — this shared-file reality, plus job.c being touched by three groups, is why no `(P)` markers are applied: the plan is sequential. +> **Hard upstream prerequisite**: ha-commit-engine must be implemented and green first — every task below consumes `commit_submit(WAIT/RETAIN)` from `include/commit.h` and never modifies `commit.c` internals. +> Verify exact line numbers with grep before editing (research.md §Verified Code Anchors has the 2026-06-11 verified table; files drift). + +- [ ] 1. Write-path classification: table, dispatch, RETAIN routing +- [ ] 1.1 Write RED tests for classification totality and RETAIN registration + - Create `testsuite/test_commit_barrier_rollout.c` (XCE_TESTING pattern, AAA structure) and register it in `controller_unit_test_src` (meson.build); declare `wal_commit_mode_t` + `wal_classify()` in src/include/persist.h so tests compile + - Tests: every value of `wal_entry_type` (wal_types.h:44-58) maps to a mode — WAL_JOB_SUBMIT/WAL_QUEUE_CTRL → WAIT, WAL_WORKER_CTRL with detail JOIN/UPDATE → WAIT and detail DEAD → RETAIN, all WAL_JOB_* state types → RETAIN, WAL_CHECKPOINT → LOCAL; an unknown type triggers the XCE_TESTING fail-fast path; a fact-type append through `persist_job_hook_fun` registers the entry with the engine in RETAIN mode (observable via the engine's retained/registered accounting against a stub engine) and returns without blocking + - Observable completion: build succeeds with the new header declarations; all new test cases FAIL (red) against the unmodified persist.c + - _Requirements: 2.1, 2.2, 3.1_ + +- [ ] 1.2 Implement wal_classify and the hook-seam dispatch to green + - Implement `wal_classify(wal_type, detail)` in persist.c per the design's verified classification table; consult it in `persist_job_hook_fun` / `persist_queue_hook_fun` / `persist_worker_hook_fun` (persist.c:1093/1172/1204 anchors): RETAIN types → `persist_wal_async` + `commit_submit(ce, appended_lsn, COMMIT_MODE_RETAIN, 0)` registration; WAIT types → WAL_JOB_SUBMIT keeps the existing sync path, queue/worker appends stay async (handler barrier owes completion, task 3); LOCAL → unchanged + - Unclassified guard: `assert` under XCE_TESTING with the offending type logged; production ERROR + RETAIN fallback + - Fact appends never propagate commit-progress errors to hook callers (local append rc only) + - Observable completion: all task 1.1 tests PASS; grep shows no bare `persist_wal_async` call in the three hook functions that bypasses classification + - _Requirements: 2.1, 2.2, 3.1_ + +- [ ] 2. Commit barrier helper and legacy adapter retirement +- [ ] 2.1 Write RED tests for persist_commit_barrier semantics + - Declare `persist_commit_barrier(persist_t *p, uint32_t timeout_ms)` in src/include/persist.h + - Tests (stub engine + replicator, n_peers=3 unless noted): returns 0 immediately when `committed_lsn` already covers `current_lsn`; returns `-ETIMEDOUT` when ACKs are withheld past the timeout and `committed_lsn` stays unmoved; returns 0 once a covering ACK advances the commit index; `timeout_ms = 0` falls back to `p->config.sync_timeout_ms`; n_peers=1 returns 0 immediately (standalone preserved); `-XCE_ERR_NOT_READY` from the engine passes through unmodified + - Observable completion: new cases FAIL (red) — the helper does not exist yet + - _Requirements: 1.1, 1.2, 1.3_ + +- [ ] 2.2 Implement the barrier helper and retire the legacy walAck counting + - Implement `persist_commit_barrier` in persist.c: snapshot `current_lsn` under `p->lock` (mirror persist.c:1019-1021), short-circuit when covered, else `commit_submit(ce, lsn, COMMIT_MODE_WAIT, timeout)`; return engine code unmodified + - repl.c `repl_wait_majority_ack` (repl.c:386-462 anchor): remove the legacy walAck counting branch (upstream marked it "retired by ha-commit-barrier-rollout") — the walAck path delegates to the engine unconditionally; the function's remaining body is the configAck track (hardened in task 5) + - Observable completion: all task 2.1 tests PASS; grep shows no remaining `acked_lsn > 0` counting and no `n_active == 0 → success` short-circuit reachable from any walAck call path + - _Requirements: 1.1, 1.2, 1.3_ + +- [ ] 3. Reply-ordering restructure of request-shaped handlers +- [ ] 3.1 Write RED integration tests for commit-first-then-reply per opcode + - Tests drive the four handlers directly (vtask-context test harness, stub standby registry): for each of `do_jobcontrol_op` (not-started-job branch, producing WAL_JOB_UPDATE/WAL_JOB_FAIL), `do_queuecontrol_op`, `do_hostcontrol_op`, `handle_worker_join` — with ACKs withheld the requester reply carries an error (`-ETIMEDOUT`) and no success reply is ever observable while the operation's entries exceed `committed_lsn`; with ACKs supplied the success reply is observable only after `committed_lsn` covers the entries; local validation failures still reply immediately with their existing error codes + - Observable completion: new cases FAIL (red) against the current reply-before-commit handlers (anchors: job.c:932, queue.c:130, worker.c:700, join.c:107-109 — re-verify with grep) + - _Requirements: 1.1, 1.2, 1.3, 1.4_ + +- [ ] 3.2 Restructure the four handlers to green + - Apply the uniform pattern: `rc = ; if (rc == 0) rc = persist_commit_barrier(&c->persist, 0); reply.status = rc; xce_reply(...)` — in `do_jobcontrol_op` (job.c:921-934), `do_queuecontrol_op` (queue.c:119-132), `do_hostcontrol_op` (worker.c:689-702); in `handle_worker_join` (join.c:33-119) insert the barrier between the AFTER_EVENT hook and the success reply, keep error replies immediate, keep `on_worker_join` after the reply + - Barrier runs after entity locks are released in every handler (the ctrl fns unlock before returning) + - Observable completion: all task 3.1 tests PASS; `handle_jobsubmit` untouched (reference implementation) + - _Requirements: 1.1, 1.2, 1.3, 1.4_ + +- [ ] 3.3 Pin the receipt-ACK verdicts with tests + - Tests: `handle_jobdispatch` (job.c:459-491) replies immediately AND dispatch processing appends no WAL entries (classification guard stays silent through a dispatch cycle; `notify_dispatch` outcomes unaffected); `do_set_preason`/`do_clr_preason` and the `do_update_op` rusage path remain receipt-style replies whose subsequent fact appends are RETAIN-registered + - Document the verdict in the test comments with the umbrella Reply-Ordering Contract reference + - Observable completion: verdict tests PASS without modifying those handlers; any future WAL append from dispatch processing trips the classification guard in CI + - _Requirements: 2.3_ + +- [ ] 4. Fact admission during quorum loss and retention proof +- [ ] 4.1 Write RED tests for the dispatch-gate fact allowlist + - Tests against `ha_dispatch_gate` (ha.c:1527 anchor) with CTRL_PRIMARY and write quorum absent: `OPCode_notify`, `OPCode_update`, `OPCode_setpreason`, `OPCode_clrpreason` return 0; `OPCode_jobsub`, `OPCode_jobcontrol`, `OPCode_queuecontrol`, `OPCode_hostcontrol`, `OPCode_jobdispatch`, `OPCode_join` still return `-XCE_ERR_NOT_READY`; with quorum present everything returns 0 as today + - Observable completion: the four fact-opcode cases FAIL (red) against the current allowlist + - _Requirements: 3.2_ + +- [ ] 4.2 Implement the allowlist to green + - Add the four fact-bearing opcodes to the CTRL_PRIMARY no-write-quorum switch (ha.c:1537-1556 anchor); CTRL_PRIMARY_COMMITTING branch untouched (deleted wholesale by ha-single-leader-role) + - Observable completion: all task 4.1 tests PASS; existing gate tests for request opcodes unchanged + - _Requirements: 3.2_ + +- [ ] 4.3 Write the fact-retention-across-quorum-loss integration test + - Scenario (stub registry, n_peers=3): disconnect standbys (quorum lost) → drive worker-fact paths (job start/finish via `do_notify`-level calls) → appends succeed with no error, entries pending (`lsn > committed_lsn`), nothing dropped; reconnect + supply covering ACKs → `committed_lsn` advances over the retained suffix with no re-delivery of the facts; assert no timeout was ever applied to the fact entries + - Observable completion: test PASSES against tasks 1.2 + 4.2 output (if it fails, fix the RETAIN/gate path, not the test); retained-depth observability counter visible in test logs + - _Requirements: 3.1, 3.3, 3.4_ + +- [ ] 5. Configuration change commit barrier +- [ ] 5.1 Write RED tests for configAck arithmetic and the upgrade failure path + - Unit tests (repl.c configAck branch via `repl_wait_majority_ack`): a standby's `acked_config_lsn` from a previous tag does not count toward the current push; n_peers=3 with zero covering acks → `-ETIMEDOUT` (the `n_active == 0 → success` short-circuit dies on this branch); self + one covering standby (majority of n_peers=3) → 0; n_peers=1 → immediate 0; update `test_repl_majority.c` configAck cases to the per-push arithmetic + - Integration tests (config_repl.c): `push_config_to_standbys` returns `-ETIMEDOUT` with acks withheld and 0 with majority acks, push count via out-param; on failure the `upgradeConfig` requester receives an error reply (send_upgrade_error shape), `committed_config_tag` is unmoved, and `restart_requested` stays clear; on success the existing reply + restart behavior is unchanged + - Observable completion: new cases FAIL (red) against the current logged-only result (config_repl.c:916-929) and unconditional success ACK (config_repl.c:1062-1073) + - _Requirements: 4.1, 4.2, 4.3, 4.4_ + +- [ ] 5.2 Implement the config barrier to green + - repl.c: configAck branch takes the in-flight push tag (signature change in src/include/repl.h), counts `acked_config_lsn >= push_tag`, majority `1 + count > n_peers / 2` over configured members, `n_peers <= 1` immediate success + - config_repl.c: `push_config_to_standbys` gains `int *acked_out` and returns the barrier result, passing `new_tag` to the wait; `do_upgrade_config_with_bytes` (config_repl.c:1056-1094 anchor) on non-zero return sends `send_upgrade_error`, skips the success ACK and skips the restart request; `committed_config_tag` advance stays success-branch-only + - Observable completion: all task 5.1 tests PASS; a failed upgrade leaves the admin tool with an explicit error and the primary running on the old committed tag + - _Requirements: 4.1, 4.2, 4.3, 4.4_ + +- [ ] 6. Idempotency and ordering guards for job transitions +- [ ] 6.1 Write RED tests for mark_job_* guards + - Tests: duplicate FINISH on a DONE job → state unchanged, INFO-level no-op, no AFTER_EVENT hook fired (no WAL entry appended); START on a DONE/EXIT job → rejected with WARN, terminal state preserved; UPDATE attempting to clear terminal bits → rejected; double application of the same transition yields state identical to single application (replay equivalence); fail-after-finish keeps the existing PERR-merge behavior (job.c:702-716 anchor); guard rejections return a code all existing callers treat as success-no-op + - Observable completion: new cases FAIL (red) against the unguarded `mark_job_start/finish/fail/update` (job.c:583/638/696/726 anchors) + - _Requirements: 5.1, 5.2, 5.3_ + +- [ ] 6.2 Implement the guards to green + - Add transition guards at the top of each `mark_job_*` (under the caller-held job WRITE lock, before BEFORE_EVENT fires): duplicate → log + return no-op; terminal → non-terminal → WARN + reject preserving state; forward transitions unchanged + - Audit all callers (`on_job_*`, `job_ctrl`, `update_job_rusages`) for the new return semantics + - Observable completion: all task 6.1 tests PASS; existing job lifecycle tests green + - _Requirements: 5.1, 5.2, 5.3_ + +- [ ] 7. Exhaustive reply-site sweep and final validation +- [ ] 7.1 Run the exhaustive xce_reply audit over all control paths + - Grep ALL `xce_reply` call sites under src/controller/ (excluding testsuite/) — research.md lists the design-time population (job.c, queue.c, worker.c, join.c, opupd.c, cluster.c, config_repl.c, ha.c, opget.c, reply.c, task.c); re-run the grep fresh since lines drift + - Classify every site into exactly one category: post-commit confirmation (restructured in task 3 / job submit / config success), receipt-only ACK for fact-shaped delivery (verdicts from task 3.3), or read-only/replication/error reply (no state-changing entries produced) + - Fix any site that confirms a request-shaped state change before commit (a missed handler silently violates umbrella 2.1); commit the audit table (site → category → evidence) in the task completion notes + - Observable completion: zero unclassified or violating reply sites in the recorded audit; any fixes covered by tests added to `test_commit_barrier_rollout.c` + - _Requirements: 2.4, 1.1, 1.4_ + +- [ ] 7.2 Full regression and barrier-completeness validation + - Build and run the complete controller testsuite with ASAN (`/xce-build controller`); fix regressions from the reply restructure, gate allowlist, configAck hardening, or guards + - End-to-end ordering assertion: across all restructured opcodes in one run, no success reply is observable while the operation's entries exceed `committed_lsn` (integration harness from 3.1 driven as a suite); fact retention test (4.3) and config barrier tests (5.1) green in the same run + - Confirm downstream readiness: classification guard active, sweep audit recorded — the hard precondition for ha-single-leader-role ("barrier before state removal") is satisfied + - Observable completion: full testsuite green under ASAN; audit + ordering evidence recorded + - _Requirements: 1.1, 1.2, 1.3, 1.4, 2.1, 2.2, 2.3, 2.4, 3.1, 3.2, 3.3, 3.4, 4.1, 4.2, 4.3, 4.4, 5.1, 5.2, 5.3_ diff --git a/.kiro/specs/ha-commit-engine/brief.md b/.kiro/specs/ha-commit-engine/brief.md new file mode 100644 index 0000000..bad97d7 --- /dev/null +++ b/.kiro/specs/ha-commit-engine/brief.md @@ -0,0 +1,24 @@ +# Brief: ha-commit-engine + +> Sub-spec 1 of 4 implementing the **ha-consistency-invariants** umbrella contract. +> Authoritative requirements/design/research: `.kiro/specs/ha-consistency-invariants/` (requirements.md, design.md §Commit Engine + §Quorum Accounting, research.md). This brief scopes the slice; do not re-derive decisions. + +## Problem +The majority-ACK check is dishonest today: `repl_wait_majority_ack` counts standbys with `acked_lsn > 0` ("ACKed anything ever"), not `acked_lsn >= entry_lsn`; quorum is checked only at the dispatch gate (TOCTOU); catch-up standbys count toward write quorum while excluded from broadcast; zero active standbys short-circuits to success. Even the one existing barrier (job submit) provides no real per-entry guarantee. + +## Desired Outcome +A commit engine (`commit.c`/`include/commit.h`) is the single authority for commit-index advancement: per-LSN majority evaluation (`acked_lsn >= N`, self counted), contiguous + monotonic `committed_lsn`, WAIT/RETAIN completion modes, `n_vcpus`-relative admission cap, membership-change re-evaluation. Wired behind the existing job-submit sync path only (adapter in `repl_wait_majority_ack`). `ha_has_write_quorum` excludes catch-up standbys. + +## Scope +- **In**: `commit.c` + `include/commit.h` per design §Commit Engine service interface; quorum-accounting fix in `ha.c`; `repl_on_ack` → `commit_on_ack` feed; removal of the `n_active == 0 → success` short-circuit for `n_peers > 1`; `n_peers <= 1` self-quorum preserved; `testsuite/test_commit_engine.c`. +- **Out**: classification/rollout to other WAL types (ha-commit-barrier-rollout); own-term gate *consumers* and COMMITTING removal (ha-single-leader-role — but `commit_set_writable_lsn` API ships here, unset = no gate); demotion/egress/catch-up (ha-convergence-recovery). + +## Requirements (umbrella IDs) +2.1 (job-submit path), 2.3, 2.6, 4.1, 4.2, 4.3, 4.4, 6.5, 7.1, 7.4, 7.5. + +## Upstream / Downstream +- **Upstream**: ha-wal-replication (acked_lsn, WalAckReply — complete). +- **Downstream**: ha-commit-barrier-rollout, ha-single-leader-role, ha-convergence-recovery (all consume the engine). + +## Constraints +Per umbrella design: `commit_on_ack` callable from iomgr (never blocks); blocking waits on vtask threads only; admission cap expressed relative to `n_vcpus` (never absolute); TDD in testsuite/ first. diff --git a/.kiro/specs/ha-commit-engine/design.md b/.kiro/specs/ha-commit-engine/design.md new file mode 100644 index 0000000..b743e4f --- /dev/null +++ b/.kiro/specs/ha-commit-engine/design.md @@ -0,0 +1,332 @@ +# Design: ha-commit-engine + +> Sub-spec 1 of 4 of the **ha-consistency-invariants** umbrella. This design slices the umbrella design's **Commit Engine** and **Quorum Accounting** components (`.kiro/specs/ha-consistency-invariants/design.md`) and reuses the umbrella's `commit.h` service interface verbatim. Discovery is complete via the umbrella's `research.md` (Option C phased hybrid, locked decisions); this spec implements umbrella Migration Strategy phase 1. Requirement IDs below are THIS spec's IDs (see `requirements.md` for the umbrella mapping). + +## Overview + +**Purpose**: This feature gives cluster operators an honest commit barrier for job submission: a new commit engine (`commit.c`) becomes the single authority for `committed_lsn` advancement, evaluating majority per entry (`acked_lsn >= N`, self counted) instead of "ACKed anything ever", and the dispatch-gate quorum count stops counting catch-up standbys. + +**Users**: Cluster operators gain the guarantee that a confirmed job submission is durable on a majority of members; downstream sub-specs (ha-commit-barrier-rollout, ha-single-leader-role, ha-convergence-recovery) gain the engine interface they build on. + +**Impact**: Replaces the counting logic of `repl_wait_majority_ack` (repl.c:386-461) for WAL ACKs with per-LSN engine evaluation; removes the `n_active == 0 → success` short-circuit for multi-member clusters; moves the `committed_lsn` store out of `persist_wal_sync_append` (persist.c:1035) into the engine; fixes `ha_has_write_quorum` (ha.c:1507) to exclude catch-up standbys. Behavior of every other write path is unchanged in this spec. + +### Goals +- Entry N commits only when `1 (self) + count(active standbys with acked_lsn >= N) >= n_peers/2 + 1` +- `committed_lsn` advancement: monotonic, contiguous, never beyond the appended log — owned by the engine alone +- Full `commit.h` service interface shipped (WAIT + RETAIN modes, `commit_set_writable_lsn`, membership re-evaluation) so downstream specs consume without interface churn +- Admission cap on concurrent WAIT blockers, expressed relative to `n_vcpus` (never absolute) +- `n_peers <= 1` self-quorum preserved; `n_peers > 1` zero-peer-ACK never commits + +### Non-Goals +- Wiring any path other than job submit (WAL_JOB_SUBMIT sync append) — barrier-rollout owns the classification sweep +- Setting `writable_lsn` anywhere (own-term gate consumers are ha-single-leader-role; unset = no gate) +- RETAIN-mode production consumers (facts roll out in ha-commit-barrier-rollout; the mode itself ships and is tested here) +- Config-change barrier (`acked_config_lsn` track untouched), demotion/egress/catch-up changes, COMMITTING removal +- Async continuation of commit waits (umbrella-documented future work; blocking condvar + admission cap is the accepted mechanism) + +## Boundary Commitments + +### This Spec Owns +- `src/controller/commit.c` + `src/controller/include/commit.h` — the commit engine: per-LSN ACK evaluation, waiter registry, admission cap, `writable_lsn` storage, `committed_lsn` advancement +- The walAck branch semantics of `repl_wait_majority_ack` (becomes the engine adapter) and the `repl_on_ack → commit_on_ack` feed +- `ha_has_write_quorum` catch-up exclusion and the `repl_active_standby_count` helper +- The `committed_lsn` advancement rule on the job-submit sync path (`persist_wal_sync_append`) +- `testsuite/test_commit_engine.c` and updates to existing tests whose expectations encode the dishonest counting + +### Out of Boundary +- Which WAL types use WAIT vs RETAIN (classification table — ha-commit-barrier-rollout) +- Calling `commit_set_writable_lsn` from promotion, WAL_NOOP, COMMITTING deletion (ha-single-leader-role) +- Demotion truncate+restart, rejoin reconciliation, egress watermark filter, ACK-driven catch-up, quorum-transition logging (ha-convergence-recovery) +- `acked_config_lsn` / configAck counting in `repl_wait_majority_ack` (config barrier — ha-commit-barrier-rollout); the configAck branch is left byte-for-byte as-is +- WalAckReply wire format, standby apply mechanics, `acked_lsn` update rules (ha-wal-replication — complete upstream) + +### Allowed Dependencies +- `standby_conn_t.acked_lsn` / `in_catch_up` per-standby tracking in `replicator_t` (src/include/repl.h) — read-only consumption; the engine never manages connections +- `persist_t.committed_lsn` atomic (src/include/persist.h:71) — the engine is the only production writer after init/truncation +- iomgr/vtaskmgr threading rules per `ha-async-io.md`: `commit_on_ack` and `commit_on_membership_change` are called on the iomgr thread and must never block on I/O or long waits (bounded mutex hold only); `commit_submit(WAIT)` blocks only on vtask threads +- Dependency direction (umbrella contract): `include/commit.h` depends only on libc/stdatomic types plus forward-declared `persist_t`; `commit.c` is called BY `persist.c` (append/sync path), `repl.c` (ACK + membership events), and `ha.c`/`cluster.c` (init, future promotion); it calls into none of them + +### Revalidation Triggers +- Any change to `commit.h` signatures or return-code contract → revalidate ha-commit-barrier-rollout, ha-single-leader-role, ha-convergence-recovery +- Any change to `acked_lsn` semantics or WalAckReply payload (ha-wal-replication) → re-verify engine evaluation +- Changing the admission-cap formula or `COMMIT_WAIT_RESERVED` default → re-check operator tuning guidance and barrier-rollout sizing assumptions +- Moving `committed_lsn` ownership (e.g., persisting it) → revalidate ha-convergence-recovery's rejoin reconciliation + +## Architecture + +### Existing Architecture Analysis +- Single-writer model: only the primary appends WAL entries; per-standby `acked_lsn` (Raft matchIndex equivalent) already exists and is updated by `repl_on_ack` (repl.c:176-196) on the iomgr thread (`peer_ctrl_msg_handler` → `repl_ack_decode_and_dispatch` → `repl_on_ack`, ha.c:2739-2748) +- ACKs are cumulative: a standby ACKs its highest contiguously applied LSN (ha-wal-replication contract), so per-standby `acked_lsn` is a watermark — engine evaluation needs no per-entry bitmap +- Defects replaced: `repl_wait_majority_ack` counts `acked_lsn > 0` (repl.c:419) — any ACK ever; `n_active == 0` short-circuits to success (repl.c:432); quorum denominator is `n_active` (connected standbys) rather than `n_peers` (configured members); `ha_has_write_quorum` (ha.c:1507-1526) counts `standby_endpoints->count`, which includes catch-up standbys +- `persist_wal_sync_append` (persist.c:1003-1049) is the only sync (blocking) write path — job submit via `persist_job_hook_fun` (persist.c:1125); it blocks a vtask pool thread (default 8, `--vcpus` override, cluster.c:1082); no liveness risk since wakeups come from iomgr +- `replicator_t` is embedded in `persist_t` (`p->repl`), and `ha_state_t`/`cluster_t` reach it via `c->persist.repl` — the engine can reach the standby registry through its `persist_t*` + +### Architecture Pattern & Boundary Map + +```mermaid +graph TB + subgraph vtask_thread + JS[job submit hook
persist_wal_sync_append] + end + subgraph iomgr_thread + PCM[peer_ctrl_msg_handler
repl_ack_decode_and_dispatch] + ROA[repl_on_ack] + end + subgraph commit_engine[commit engine - commit.c] + SUB[commit_submit WAIT/RETAIN] + OA[commit_on_ack] + MC[commit_on_membership_change] + CL[(committed_lsn
in persist_t)] + end + GATE[ha_dispatch_gate
ha_has_write_quorum] + REG[(replicator_t standbys
acked_lsn, in_catch_up)] + + GATE -->|fast reject 6.1| JS + JS -->|entry lsn N| SUB + PCM --> ROA + ROA -->|standby_idx, acked_lsn| OA + ROA -->|updates| REG + OA -->|reads| REG + OA -->|advance + broadcast| CL + SUB -->|wait predicate on| CL + MC -->|wake + re-evaluate| SUB + GATE -->|repl_active_standby_count| REG +``` + +**Architecture Integration** (sliced from umbrella): +- Selected pattern: single commit engine as the authority for `committed_lsn`; the dispatch gate stays a fast-rejection filter (6.1), the engine is the authoritative ACK-time verifier (1.2, 4.1) — closing the TOCTOU by construction: gate-time connectivity never substitutes for acknowledgment (1.3) +- Existing patterns preserved: hook-based persistence dispatch, full fan-out broadcast, `errnox` early-return style, `ack_cond` signaling (kept for the untouched configAck track) +- New component rationale (umbrella): requirements families 2.x/4.x are one capability; placing them in `repl.c` would bloat connection management with consensus logic +- Steering compliance: iomgr callbacks never block (bounded mutex only); blocking waits on vtask threads with `n_vcpus`-relative admission cap; TDD with testsuite/ tests first + +### Technology Stack + +| Layer | Choice / Version | Role in Feature | Notes | +|-------|------------------|-----------------|-------| +| Backend / Services | C (gnu17), pthreads, stdatomic | commit engine | no new dependencies, no .capnp changes | +| Data / Storage | existing WAL (persist.c) | `committed_lsn` atomic in `persist_t` | no schema change; WAL_NOOP is NOT in this slice | +| Build / Test | meson, testsuite/ pattern | `test_commit_engine.c` registered in `controller_unit_test_src` | XCE_TESTING seams | + +## File Structure Plan + +### Directory Structure +``` +src/controller/ +├── commit.c # NEW — commit engine: per-LSN evaluation, waiter registry, +│ # admission cap, writable_lsn, committed_lsn advancement +├── include/commit.h # NEW — engine public API (controller-internal; umbrella-verbatim) +└── testsuite/ + └── test_commit_engine.c # NEW — unit + integration tests for the engine and wiring +``` + +### Modified Files +- `src/include/repl.h` — `replicator_t` gains `struct commit_engine *ce` (forward-declared, NULL until wired); declares `repl_set_commit_engine()`, `repl_active_standby_count()`; `repl_wait_majority_ack()` gains an `entry_lsn` parameter +- `src/controller/repl.c` — `repl_on_ack` forwards `(standby_idx, acked_lsn)` to `commit_on_ack` after updating `acked_lsn`; `repl_add_standby` / `repl_remove_standby` / `repl_start_catchup` / `repl_complete_catchup` call `commit_on_membership_change`; walAck branch of `repl_wait_majority_ack` delegates to `commit_submit(WAIT)` when the engine is wired (legacy counting survives only for engine-less unit-test contexts and is retired by ha-commit-barrier-rollout); `repl_active_standby_count` helper added +- `src/controller/persist.c` — `persist_wal_sync_append` passes `written_lsn` to the adapter; deletes its own `committed_lsn` store (persist.c:1035) and the `has_standbys → -ENODEV` special case on the engine-wired path (the engine decides: self-quorum vs timeout) +- `src/controller/ha.c` — `ha_has_write_quorum` counts via `repl_active_standby_count` (connected AND not `in_catch_up`); `ha_state_t` gains a `replicator_t *repl` back-pointer set at cluster init +- `src/controller/ha.h` — `ha_state_t` field addition (`replicator_t *repl`) +- `src/controller/include/cluster.h` / `cluster.c` — `cluster_t` gains `commit_engine_t commit`; `commit_engine_init(&c->commit, &c->persist, ha->n_peers, c->vtaskmgr.n_vcpus)` + `repl_set_commit_engine` called at init phase after vtask pool sizing (cluster.c:1082) and peer count are known; `commit_engine_fini` on teardown +- `src/controller/meson.build` — add `commit.c` to controller sources and `testsuite/test_commit_engine.c` to `controller_unit_test_src` +- `src/controller/testsuite/test_repl_majority.c` — walAck cases updated to engine-wired per-LSN semantics (configAck cases untouched) + +## System Flows + +### Job submit through the engine (umbrella "request-shaped write", sliced) + +```mermaid +sequenceDiagram + participant C as client + participant V as vtask thread + participant CE as commit engine + participant R as repl broadcast + participant S as standby + participant IO as iomgr thread + C->>V: job submit + V->>V: ha_dispatch_gate (incl. ha_has_write_quorum, catch-up excluded) + V->>V: insert job (provisional, unchanged order) + V->>R: persist_wal_async: append lsn=N + broadcast + V->>CE: commit_submit(N, WAIT, sync_timeout_ms) + CE->>CE: admission cap check (n_vcpus - reserved) + S->>IO: WalAck acked_lsn >= N + IO->>CE: repl_on_ack → commit_on_ack + CE->>CE: majority for N? advance committed_lsn, broadcast cond + CE-->>V: 0 (committed) | -ETIMEDOUT | -XCE_ERR_NOT_READY + alt committed + V->>C: success + else timeout / not ready + V->>C: error (operation failed) + end +``` + +Flow decisions: the admission cap rejects before blocking when `inflight_waits >= max(1, n_vcpus - COMMIT_WAIT_RESERVED)` (7.1, 7.2); majority is evaluated against the entry's LSN at ACK time — gate-time connectivity never substitutes (1.2, 1.3, 4.1); a timeout leaves `committed_lsn` unmoved past the entry (2.1) and the entry in the log (outcome converges per umbrella 2.5, owned downstream). + +### Commit evaluation (inside `commit_on_ack`) + +Under the engine mutex: collect `acked_lsn` of all standbys with `ep != NULL && !in_catch_up` into a scratch array, sort descending. With self counted, entry N has majority when at least `n_peers/2` active standbys have `acked_lsn >= N`; therefore the new commit candidate is `arr[n_peers/2 - 1]` (0-indexed; 0 candidates → no advance) clamped to the highest appended LSN. Store `committed_lsn = max(committed_lsn, candidate)` (2.2); cumulative ACK watermarks make the result contiguous by construction (2.3). Broadcast the condvar; each waiter re-checks its own predicate. Catch-up standbys are excluded from the count (umbrella-locked, conservative — their ACKs count after `repl_complete_catchup` triggers `commit_on_membership_change` re-evaluation). + +## Requirements Traceability + +| Requirement | Summary | Components | Flows | +|-------------|---------|------------|-------| +| 1.1 | submit confirmed only after per-entry majority | Commit Engine, Job-Submit Adapter | job submit | +| 1.2 | ACK counts toward N only if acked_lsn >= N | Commit Engine | commit evaluation | +| 1.3 | connectivity never substitutes for ACKs | Commit Engine (ACK-time eval) | job submit | +| 2.1 | no commit-index advance without majority | Commit Engine | commit evaluation | +| 2.2 | monotonic committed_lsn | Commit Engine (max() store) | commit evaluation | +| 2.3 | contiguous, bounded by appended log | Commit Engine (watermark median, clamp) | commit evaluation | +| 3.1, 3.2, 3.3 | admission quorum: only members able to receive | Quorum Accounting (`ha_has_write_quorum`, `repl_active_standby_count`) | job submit (gate) | +| 4.1 | post-acceptance shrink → fail, not confirm | Commit Engine (WAIT timeout, no false success) | job submit | +| 4.2 | membership change re-evaluates pending waits | Commit Engine (`commit_on_membership_change`), ACK Feed | — | +| 4.3, 4.4 | zero peer ACKs never majority (n_peers>1) | Commit Engine (short-circuit removal) | commit evaluation | +| 5.1 | lag never blocks majority confirmation | Commit Engine (majority threshold only) | commit evaluation | +| 6.1 | reject without quorum | Quorum Accounting (gate fast-reject) + Commit Engine | job submit | +| 6.2 | auto-resume on quorum restore | Quorum Accounting (stateless re-evaluation per request) | — | +| 6.3 | standalone self-quorum | Commit Engine (`n_peers <= 1` immediate commit) | — | +| 7.1, 7.2 | n_vcpus-relative admission cap, NOT_READY beyond | Commit Engine (admission counter) | job submit | +| 7.3 | ACK processing unaffected at cap | ACK Feed (iomgr, non-blocking) | — | + +## Components and Interfaces + +| Component | Layer | Intent | Req Coverage | Key Dependencies | Contracts | +|-----------|-------|--------|--------------|------------------|-----------| +| Commit Engine | controller/commit.c | authority for commit-index advancement and waiter completion | 1.1–1.3, 2.1–2.3, 4.1–4.4, 5.1, 6.3, 7.1–7.2 | repl ACK events (P0), persist_t committed_lsn (P0) | Service, State | +| ACK Feed | controller/repl.c | forward ACK + membership events to the engine from iomgr | 4.2, 7.3 | commit engine (P0), iomgr handler chain (P0) | Event | +| Quorum Accounting | controller/ha.c, repl.c helper | honest gate-time quorum, catch-up exclusion | 3.1–3.3, 6.1, 6.2 | repl registry (P0) | Service | +| Job-Submit Adapter | controller/persist.c, repl.c | route the sync append wait through the engine | 1.1, 6.3 | commit engine (P0) | Service | + +### Commit Engine (`commit.c` / `include/commit.h`) + +| Field | Detail | +|-------|--------| +| Intent | Single authority for per-entry commit evaluation, `committed_lsn` advancement, and waiter completion | +| Requirements | 1.1–1.3, 2.1–2.3, 4.1–4.4, 5.1, 6.3, 7.1–7.2 | + +**Responsibilities & Constraints** +- Owns advancement of `persist->committed_lsn` (the atomic stays in `persist_t`; only the engine stores to it in production after init/truncation paths — the store at persist.c:1035 is deleted; the truncation store at persist.c:1438 remains) +- Commit rule (Raft §5.3, umbrella-verbatim): entry N is committed when `count(self + active standbys with acked_lsn >= N) > n_peers / 2`; advancement is contiguous and monotonic (2.1–2.3) +- Own-term gate storage: `writable_lsn` defaults to 0 = no gate (this spec never sets it); when set (by ha-single-leader-role), no waiter completes successfully until `committed_lsn >= writable_lsn` +- Admission cap: at most `max(1, n_vcpus - COMMIT_WAIT_RESERVED)` (reserved default = 2) concurrent WAIT blockers; excess fails fast with `-XCE_ERR_NOT_READY`. Expressed relative to `n_vcpus` only — never absolute (operator tunes `--vcpus`) +- `n_peers <= 1`: self-ACK constitutes majority; WAIT returns 0 immediately and advances `committed_lsn` to the entry (6.3 — intentional change: standalone nodes now advance `committed_lsn` on sync appends, Raft-correct). For `n_peers > 1`, zero peer ACKs never commit (4.3, 4.4) + +**Dependencies** +- Inbound: `repl_on_ack` (iomgr) — ACK events (P0); `persist_wal_sync_append` — WAIT registration (P0); `cluster.c` init — lifecycle (P0); membership events from repl registry mutations (P0) +- Outbound: none (reads `p->repl` registry and stores `p->committed_lsn`); signals waiters via condvar broadcast with per-LSN predicates + +**Contracts**: Service [x] / State [x] / Event [x] + +##### Service Interface (umbrella-verbatim, `src/controller/include/commit.h`) +```c +/* include/commit.h — all functions thread-safe; _on_ack callable from iomgr (non-blocking) */ +typedef enum { COMMIT_MODE_WAIT, COMMIT_MODE_RETAIN } commit_mode_t; + +int commit_engine_init(commit_engine_t *ce, persist_t *p, int n_peers, int n_vcpus); +void commit_engine_fini(commit_engine_t *ce); + +/* Register entry at append time. RETAIN returns 0 immediately. + * WAIT blocks up to timeout_ms: 0 = committed; -ETIMEDOUT = not committed + * (entry remains in log; outcome resolves per umbrella 2.5); -XCE_ERR_NOT_READY = + * admission cap exhausted (only cause). An unmet own-term gate does NOT fail + * fast: the gate is part of the completion predicate, so WAIT blocks within + * timeout_ms until the gate opens, surfacing -ETIMEDOUT if it never does. */ +int commit_submit(commit_engine_t *ce, uint64_t lsn, commit_mode_t mode, + uint32_t timeout_ms); + +/* iomgr path: record standby ACK, evaluate majority, advance committed_lsn + * contiguously, wake satisfied waiters. Never blocks. */ +void commit_on_ack(commit_engine_t *ce, int standby_idx, uint64_t acked_lsn); + +/* Promotion: set own-term gate to the no-op entry's LSN. + * (API ships here; no caller in this spec — unset = no gate.) */ +void commit_set_writable_lsn(commit_engine_t *ce, uint64_t noop_lsn); + +/* Quorum-membership change (standby add/remove/catch-up transition): + * re-evaluate pending entries; standbys in catch-up are excluded. */ +void commit_on_membership_change(commit_engine_t *ce); +``` +- Preconditions: entries submitted in LSN order (single-writer guarantees this); `commit_engine_init` called after `n_peers` and `n_vcpus` are final +- Postconditions: `committed_lsn` never decreases (2.2); never exceeds the highest majority-acked contiguous LSN nor the highest appended LSN (2.1, 2.3) +- Invariants: no waiter completes successfully while `committed_lsn < its lsn` or (gate set) `committed_lsn < writable_lsn`; `inflight_waits <= max(1, n_vcpus - COMMIT_WAIT_RESERVED)` + +##### State Management +- State: per-standby view delegated to `standby_conn_t.acked_lsn` / `in_catch_up` (no duplication); internal: sorted matchIndex scratch array (`MAX_STANDBYS`), waiter accounting (per-LSN predicate over shared condvar), `writable_lsn`, `inflight_waits` counter, `n_peers`, `n_vcpus`, `persist_t *p` back-reference +- Concurrency: one mutex + one condvar (broadcast on `committed_lsn` advance and on membership change; waiters re-check per-LSN predicate — umbrella-accepted broadcast cost); `committed_lsn` read lock-free via the existing atomic; mutex hold in `commit_on_ack` is bounded (scan + sort of ≤ MAX_STANDBYS entries, no I/O) — safe on iomgr +- Re-evaluation semantics (4.2): membership change broadcasts the condvar so pending waiters re-check against updated membership; waiters whose entries gained majority complete with 0, others keep waiting until their deadline and fail with `-ETIMEDOUT` (4.1 — no confirmation ever happens without actual majority ACK; early-fail on shrink is permitted but not required by the umbrella, and is deliberately not implemented to allow reconnection within the timeout) + +**Implementation Notes** +- Integration: instance embedded in `cluster_t`; wired to repl via `repl_set_commit_engine(&c->persist.repl, &c->commit)`; XCE_TESTING tests construct the engine standalone against a stub `persist_t` + `replicator_t` +- Validation: assert monotonicity and the inflight invariant under `XCE_TESTING`; log a counter of committed-vs-appended lag (retained-uncommitted depth) for observability +- Risks: condvar broadcast storms under high write concurrency — accepted at current scale (umbrella); revisit with async continuation (out of scope) + +### ACK Feed (`repl.c`) + +| Field | Detail | +|-------|--------| +| Intent | Deliver ACK and membership events from the iomgr thread to the engine without blocking | +| Requirements | 4.2, 7.3 | + +Summary: `repl_on_ack` (repl.c:176) — after `atomic_store(&s->acked_lsn, acked_lsn)` and the existing `ack_cond` signal (kept for configAck) — calls `commit_on_ack(r->ce, slot_idx, acked_lsn)` when `r->ce != NULL`. `repl_add_standby`, `repl_remove_standby`, `repl_start_catchup`, `repl_complete_catchup` call `commit_on_membership_change(r->ce)` after mutating the registry. All call sites are iomgr-driven; `commit_on_*` never block (7.3). `replicator_t` gains the forward-declared `struct commit_engine *ce` pointer (NULL = not wired) so `src/include/repl.h` keeps zero controller-header dependencies. + +### Quorum Accounting (`ha.c` + `repl.c` helper) + +| Field | Detail | +|-------|--------| +| Intent | Honest gate-time write-admission quorum: count only members able to receive new entries | +| Requirements | 3.1–3.3, 6.1, 6.2 | + +Summary (umbrella §Quorum Accounting, sliced): new `int repl_active_standby_count(replicator_t *r)` counts slots with `ep != NULL && !in_catch_up` under `r->lock`. `ha_has_write_quorum` (ha.c:1507) replaces `standby_endpoints->count` with this helper via a `replicator_t *repl` back-pointer on `ha_state_t` (set during cluster init; when NULL — legacy test contexts — fall back to the current `standby_endpoints` count). Quorum condition unchanged: `n_peers <= 1 → true`; else `active >= n_peers / 2` (3.1–3.3). The gate stays a fast-rejection filter (6.1, `-XCE_ERR_NOT_READY` per existing `ha_dispatch_gate`); it is stateless per request, so quorum restoration auto-resumes acceptance with no operator action (6.2); the engine re-verifies authoritatively at ACK time (1.3, 4.1). Quorum-loss transition logging stays out (ha-convergence-recovery). + +### Job-Submit Adapter (`persist.c` + `repl.c`) + +| Field | Detail | +|-------|--------| +| Intent | Route the existing job-submit sync wait through the engine; preserve external return-code contract | +| Requirements | 1.1, 4.3, 4.4, 6.3 | + +Summary (umbrella migration note: "`repl_wait_majority_ack` becomes a thin adapter"): `repl_wait_majority_ack(r, timeout_ms, ack_op)` gains an `entry_lsn` parameter. walAck branch: when `r->ce` is wired, `return commit_submit(r->ce, entry_lsn, COMMIT_MODE_WAIT, timeout_ms)`; legacy counting survives only for engine-less unit-test contexts (deprecated comment; retired by ha-commit-barrier-rollout when call sites move to the engine directly). configAck branch: unchanged, `entry_lsn` ignored. `persist_wal_sync_append` (persist.c:1003): passes `written_lsn`; on the engine path, deletes the `has_standbys → -ENODEV` special case and its own `committed_lsn` store — the engine returns 0 (and has advanced `committed_lsn`) for `n_peers <= 1` (6.3), and `-ETIMEDOUT` for `n_peers > 1` with no covering ACKs (4.3, 4.4 — the `n_active == 0 → success` short-circuit is thereby removed from production). Return contract to `persist_job_hook_fun` callers is unchanged (0 / `-ETIMEDOUT` / now also `-XCE_ERR_NOT_READY`), and the existing error propagation to the job-submit client (job.c reference path) carries it (1.1). + +## Data Models + +### Domain Model (changes only) +- **commit_engine_t** (in-memory only; commit state volatile, Raft-conformant — umbrella-locked): `{ pthread_mutex_t lock; pthread_cond_t cond; persist_t *p; int n_peers; int n_vcpus; int inflight_waits; uint64_t writable_lsn; uint64_t scratch[MAX_STANDBYS]; }` +- **replicator_t**: + `struct commit_engine *ce` (NULL until wired) +- **ha_state_t**: + `replicator_t *repl` (NULL in legacy test contexts) +- **cluster_t**: + `commit_engine_t commit` +- Invariants: `committed_lsn` monotonic, contiguous, ≤ highest appended LSN; `inflight_waits` within cap; engine never duplicates per-standby state + +## Error Handling + +### Error Strategy +- `commit_submit(WAIT)` returns `0` (committed), `-ETIMEDOUT` (not committed within timeout — entry remains in log; cluster-wide outcome convergence is umbrella 2.5, owned by ha-convergence-recovery), `-XCE_ERR_NOT_READY` (admission-cap exhaustion only — an unmet own-term gate is not a fail-fast cause: it is part of the WAIT completion predicate, so the waiter blocks within its timeout until the gate opens and surfaces `-ETIMEDOUT` otherwise) — distinct log messages per cause, both retriable +- Errors propagate via the existing `errnox` early-return pattern: `persist_wal_sync_append` → `persist_job_hook_fun` → job-submit reply; no in-memory rollback (provisional-state model, umbrella-locked) +- Gate rejection (no write quorum) keeps the existing `-XCE_ERR_NOT_READY` dispatch-gate behavior (6.1) +- `commit_engine_init` validates `n_peers >= 0`, `n_vcpus >= 1`, non-NULL `persist_t`; returns `-EINVAL` otherwise + +### Monitoring +- Log counters: inflight WAIT count vs cap; committed-vs-appended lag; per-cause rejection WARNs (rate-limited to transitions where applicable). Metrics export out of scope. + +## Testing Strategy + +### Unit Tests (`testsuite/test_commit_engine.c`, XCE_TESTING, stub persist/replicator) +- Per-LSN majority: with n_peers=3, ACK for LSN M does not commit entry N>M (`acked_lsn > 0` regression dies) (1.2); ACK `>= N` from one standby + self commits N (1.1) +- Contiguity + monotonicity: out-of-order/cumulative ACK watermarks advance `committed_lsn` to the median watermark, never past appended log, never backwards (2.1–2.3) +- Zero-peer rule: n_peers=3, no standby ACKs → WAIT returns `-ETIMEDOUT`, `committed_lsn` unmoved (4.3, 4.4); n_peers=1 → WAIT returns 0 immediately, `committed_lsn` advanced (6.3) +- Admission cap: with n_vcpus=8 reserved=2, the 7th concurrent WAIT gets `-XCE_ERR_NOT_READY`; cap floor `max(1, ...)` at tiny n_vcpus; ACKs still advance commits for admitted waiters while cap is saturated (7.1–7.3) +- Own-term gate storage: `writable_lsn` unset → no gating; set above entry → waiter held until `committed_lsn >= writable_lsn` (interface contract for downstream; no production caller here) +- Membership re-evaluation: catch-up standby's ACK excluded; after `commit_on_membership_change` (catch-up complete) its watermark counts and the pending waiter completes (4.2); waiter never falsely completes on shrink (4.1) +- Lag tolerance: n_peers=3, one standby far behind — majority ACK still commits (5.1) + +### Integration Tests (testsuite/) +- Quorum accounting: `repl_active_standby_count` excludes `in_catch_up`; `ha_has_write_quorum` false when the only connected standby is in catch-up (n_peers=3), true again after `repl_complete_catchup`; gate re-accepts after reconnection without any reset call (3.1–3.3, 6.1, 6.2) +- ACK feed: `repl_on_ack` with wired engine updates `acked_lsn` AND advances `committed_lsn` when majority reached (4.2 wiring) +- Sync-append path: `persist_wal_sync_append` with wired engine — success only on per-entry majority; `-ETIMEDOUT` with stale `acked_lsn > 0` from an earlier entry (the dishonest counting regression test); `committed_lsn` unmoved on timeout (1.1, 1.2, 2.1) +- `test_repl_majority.c` updated: walAck cases wire an engine and assert per-LSN semantics; configAck cases byte-identical + +### Regression +- Full controller testsuite + ASAN (`/xce-build controller`) green; no production walAck path reaches the legacy `acked_lsn > 0` counting + +## Performance & Scalability +- Commit latency unchanged from the ha-wal-replication baseline (majority RTT + standby fsync); `commit_on_ack` adds an O(MAX_STANDBYS log MAX_STANDBYS) scan per ACK under a short mutex — negligible +- Throughput under degradation bounded by the admission cap — deliberate CP rejection, `n_vcpus`-relative; sizing guidance is operator-doc material (umbrella research 3(e)), not spec constants + +## Migration Strategy +This spec is phase 1 of the umbrella's hard-ordered landing ("barrier before state removal"): commit engine + per-LSN evaluation behind the existing job-submit path — a behavioral fix only, no new write paths. The adapter shell (`repl_wait_majority_ack`) and the engine-less legacy fallback are explicitly transitional; ha-commit-barrier-rollout moves call sites onto the engine directly and retires the fallback. Rollback trigger: controller testsuite regression or job-submit E2E failure — reverting this spec restores the prior (dishonest but functional) barrier, leaving the system no less consistent than before. diff --git a/.kiro/specs/ha-commit-engine/requirements.md b/.kiro/specs/ha-commit-engine/requirements.md new file mode 100644 index 0000000..8e016f2 --- /dev/null +++ b/.kiro/specs/ha-commit-engine/requirements.md @@ -0,0 +1,107 @@ +# Requirements Document + +> Sub-spec 1 of 4 implementing the **ha-consistency-invariants** umbrella contract. +> The umbrella documents (`.kiro/specs/ha-consistency-invariants/requirements.md`, `design.md`, `research.md`) are the authoritative contract. This document restates the slice owned by this spec — umbrella criteria 2.1 (job-submit path), 2.3, 2.6, 4.1–4.4, 6.5, 7.1, 7.4, 7.5 — as this spec's own numbered requirements. Each criterion notes its umbrella ID; the traceability table at the end gives the full mapping. + +## Project Description (Input) + +The majority-ACK check in the XCE controller is dishonest today: `repl_wait_majority_ack` counts standbys with `acked_lsn > 0` ("ACKed anything ever"), not `acked_lsn >= entry_lsn`; quorum is checked only at the dispatch gate (TOCTOU); catch-up standbys count toward write quorum while excluded from broadcast; and zero active standbys short-circuits to success. Even the one existing commit barrier (job submit) provides no real per-entry guarantee. Cluster operators need a commit engine (`commit.c` / `include/commit.h`) that is the single authority for commit-index advancement: per-LSN majority evaluation (`acked_lsn >= N`, self counted), contiguous and monotonic `committed_lsn`, WAIT/RETAIN completion modes, an `n_vcpus`-relative admission cap, and membership-change re-evaluation — wired behind the existing job-submit sync path only, with the quorum-accounting holes in `ha.c` fixed. + +## Introduction + +This spec delivers the commit engine and quorum-accounting integrity slice of the umbrella contract. After this spec, a job submission is confirmed to its requester only when its specific log entry has been acknowledged by a majority of cluster members (counting the primary itself); the commit index advances monotonically and contiguously, never on stale or substitute evidence; write admission counts only members actually able to receive entries; and a multi-member cluster never treats zero peer acknowledgments as a majority. Standalone (single-member) self-quorum behavior is preserved. The engine ships the full service interface (WAIT and RETAIN completion modes, own-term gate setter) so downstream sub-specs can consume it, but only the job-submit path is wired in this spec. + +## Boundary Context + +- **In scope**: The commit engine (per-LSN majority evaluation, commit-index advancement, WAIT/RETAIN completion, admission cap, membership-change re-evaluation); the quorum-accounting fix in the dispatch gate (catch-up exclusion); feeding standby acknowledgments into the engine; removal of the zero-active-standbys success short-circuit for multi-member clusters; preservation of single-member self-quorum; unit/integration tests for all of the above. +- **Out of scope**: Classification and rollout of the barrier to other WAL types (ha-commit-barrier-rollout); own-term gate *consumers* and CTRL_PRIMARY_COMMITTING removal (ha-single-leader-role — the `commit_set_writable_lsn` API ships here, but unset means no gate); demotion/egress-filter/catch-up changes (ha-convergence-recovery); config-change barrier error propagation (ha-commit-barrier-rollout); election and vote correctness (raft-library); replication wire format (ha-wal-replication). +- **Adjacent expectations**: Upstream, this spec relies on the ha-wal-replication machinery (per-standby `acked_lsn` tracking and WalAckReply processing — complete). Downstream, ha-commit-barrier-rollout, ha-single-leader-role, and ha-convergence-recovery consume the engine's service interface; changes to that interface require their revalidation. + +## Requirements + +### Requirement 1: Per-Entry Majority Commit for Job Submission + +**Objective:** As a cluster operator, I want a job submission confirmed only after its specific log entry is durable on a majority of cluster members, so that no acknowledged submission can be lost by a single node failure or failover. + +#### Acceptance Criteria + +1. When the primary receives a job submission, the controller shall confirm the submission to its requester only after the submission's log entry has been acknowledged by a majority of cluster members, counting itself. *(umbrella 2.1, job-submit path)* +2. When the controller evaluates whether the entry with LSN N is committed, the controller shall count a standby's acknowledgment toward N only if that standby's acknowledged LSN is greater than or equal to N. *(umbrella 4.2)* +3. The controller shall not substitute connectivity observed at operation-acceptance time for actual per-entry acknowledgments when determining that an entry is committed. *(umbrella 4.2)* + +### Requirement 2: Commit Index Integrity + +**Objective:** As a cluster operator, I want the commit index to advance only on real majority evidence, monotonically and without gaps, so that the committed prefix of the log is always a safe recovery point. + +#### Acceptance Criteria + +1. If an entry has not achieved majority acknowledgment, the controller shall not advance its commit index past that entry. *(umbrella 2.3)* +2. The controller shall advance its commit index monotonically; the commit index shall never decrease. *(umbrella 2.6)* +3. When acknowledgments arrive in any order, the controller shall advance the commit index contiguously — never beyond the lowest entry that lacks majority acknowledgment, and never beyond the highest locally appended entry. *(umbrella 2.3, 2.6)* + +### Requirement 3: Admission Quorum Accounting + +**Objective:** As a cluster operator, I want write admission to count only cluster members that can actually receive new log entries, so that a write is never admitted against a quorum that does not exist. + +#### Acceptance Criteria + +1. When the primary evaluates whether to accept a state-changing operation, the controller shall count toward quorum only cluster members currently able to receive new log entries. *(umbrella 4.1)* +2. The controller shall exclude standbys undergoing catch-up from the write-admission quorum count. *(umbrella 4.1)* +3. The controller shall exclude disconnected members from the write-admission quorum count. *(umbrella 4.1)* + +### Requirement 4: Acknowledgment-Time Quorum Integrity + +**Objective:** As a cluster operator, I want commit decisions re-verified at acknowledgment time against current membership, so that an operation accepted under a quorum that subsequently vanished is reported as failed rather than confirmed. + +#### Acceptance Criteria + +1. If the set of members able to acknowledge shrinks below a majority after an operation is accepted but before majority acknowledgment is obtained, the primary shall report the operation as failed rather than confirm it. *(umbrella 4.3)* +2. When cluster membership changes (standby connect, disconnect, catch-up entry, or catch-up completion), the controller shall re-evaluate pending commit waits against the updated membership. *(umbrella 4.3)* +3. While the cluster is configured with more than one member, the primary shall never treat zero peer acknowledgments as constituting a majority. *(umbrella 4.4)* +4. While the cluster is configured with more than one member and no standby acknowledgment covering the entry arrives within the commit timeout, the controller shall complete the commit wait with a failure result, not success. *(umbrella 4.4 — removes the zero-active-standbys success short-circuit)* + +### Requirement 5: Standby Lag Never Blocks Confirmation + +**Objective:** As a cluster operator, I want majority to be the only commit threshold, so that one slow or lagging standby cannot stall confirmed writes. + +#### Acceptance Criteria + +1. While one or more standbys lag behind the replication stream, the primary shall continue to confirm operations that achieve majority acknowledgment; full replication shall not be a confirmation precondition. *(umbrella 6.5)* + +### Requirement 6: Quorum Loss, Restoration, and Standalone Behavior + +**Objective:** As a cluster operator, I want a primary without majority to refuse state changes with a clear error and to resume automatically when majority returns, while a single-member cluster keeps confirming locally. + +#### Acceptance Criteria + +1. While the primary cannot reach a majority of cluster members, the primary shall reject cluster-state-changing operations with an error indicating that the cluster cannot currently commit. *(umbrella 7.1)* +2. When majority connectivity is restored, the primary shall resume accepting state-changing operations without operator intervention. *(umbrella 7.4)* +3. While the cluster is configured with a single member, the controller shall treat its own acknowledgment as majority and confirm operations locally, preserving existing standalone behavior. *(umbrella 7.5)* + +### Requirement 7: Commit-Wait Admission Control + +**Objective:** As a cluster operator, I want the number of concurrently blocked commit waits bounded relative to my configured worker-thread budget, so that slow commits degrade into fast, retriable rejections instead of exhausting the request-processing capacity I tuned with `--vcpus`. + +#### Acceptance Criteria + +1. The controller shall bound the number of concurrent blocking commit waits relative to the configured worker-thread count (`--vcpus`), never as an absolute constant. *(umbrella design §Commit Engine admission cap; locked decision, umbrella research item 3(d–e))* +2. If admitting a new blocking commit wait would exceed the admission bound, the controller shall reject the operation with a retriable not-ready error instead of blocking. *(umbrella design §Commit Engine admission cap)* +3. While the admission bound is reached, the controller shall continue to process incoming acknowledgments and advance the commit index for already-admitted waits. *(umbrella design §Commit Engine; ACK processing on the I/O thread is never blocked)* + +## Umbrella Traceability + +| This spec | Umbrella ID | Notes | +|-----------|-------------|-------| +| 1.1 | 2.1 | Job-submit path only; other operation types roll out in ha-commit-barrier-rollout | +| 1.2, 1.3 | 4.2 | Per-entry ACK verification (`acked_lsn >= N`) | +| 2.1 | 2.3 | No commit-index advance without majority | +| 2.2 | 2.6 | Monotonic commit index | +| 2.3 | 2.3, 2.6 | Contiguous advancement, bounded by appended log | +| 3.1, 3.2, 3.3 | 4.1 | Admission quorum counts only members able to receive; catch-up + disconnected excluded | +| 4.1, 4.2 | 4.3 | Post-acceptance quorum shrink → fail; membership-change re-evaluation | +| 4.3, 4.4 | 4.4 | Zero peer ACKs never a majority for n_peers > 1 | +| 5.1 | 6.5 | Majority is the only commit threshold | +| 6.1 | 7.1 | Reject state changes without quorum | +| 6.2 | 7.4 | Auto-resume on quorum restoration | +| 6.3 | 7.5 | Standalone self-quorum preserved | +| 7.1, 7.2, 7.3 | umbrella design §Commit Engine (admission cap) | Locked design decision from umbrella research item 3(d–e); `n_vcpus`-relative, never absolute | diff --git a/.kiro/specs/ha-commit-engine/research.md b/.kiro/specs/ha-commit-engine/research.md new file mode 100644 index 0000000..6ffcc45 --- /dev/null +++ b/.kiro/specs/ha-commit-engine/research.md @@ -0,0 +1,38 @@ +# Research Log: ha-commit-engine + +Date: 2026-06-11. Discovery status: **complete via umbrella** — this sub-spec inherits the ha-consistency-invariants discovery (`.kiro/specs/ha-consistency-invariants/research.md`: gap analysis, Option C selection, deep-dives §A–§C, locked decisions). No decisions are re-derived here. This log records only the slice-scoped code verification performed for this spec's design. + +## Inherited Locked Decisions (umbrella — do not re-litigate) +- Commit engine as single authority; WAIT/RETAIN completion modes (research synthesis) +- Admission cap relative to `n_vcpus` (never absolute); `COMMIT_WAIT_RESERVED` default 2 (research item 3(d–e)) +- Blocking condvar on vtask threads accepted; async continuation deferred; no liveness risk (ACKs on iomgr) (research item 3(b)) +- Catch-up standbys excluded from quorum accounting and commit counting until `repl_complete_catchup` (umbrella §Quorum Accounting + commit_on_membership_change contract) +- Commit state volatile (no persisted commitIndex); convergence/rejoin owned by ha-convergence-recovery (research §C) +- Own-term gate via WAL_NOOP at promotion — API (`commit_set_writable_lsn`) ships in this spec, consumers in ha-single-leader-role (research item 4) + +## Slice Verification (2026-06-11, this spec) + +| Fact | Evidence | Implication | +|------|----------|-------------| +| `standby_conn_t.acked_lsn` atomic exists, updated by `repl_on_ack` | src/include/repl.h:24; repl.c:176, store at repl.c:187 | matchIndex bookkeeping ready; engine consumes read-only | +| Dishonest counting: `acked_lsn > 0` | repl.c:419 | replaced by per-LSN engine evaluation | +| `n_active == 0 → success` short-circuit | repl.c:432-435 | removed for n_peers>1 via engine (engine knows n_peers; repl does not) | +| Quorum denominator is `n_active`, not `n_peers` | repl.c:437 | engine uses configured `n_peers` per umbrella commit rule | +| `ha_has_write_quorum` counts `standby_endpoints->count` (includes catch-up) | ha.c:1507-1526; gate call at ha.c:1537 | fix via new `repl_active_standby_count` (ep && !in_catch_up); `in_catch_up` at repl.h:26 | +| Sync barrier: `persist_wal_sync_append` | persist.c:1003-1049; committed_lsn store at 1035; `has_standbys → -ENODEV` degraded-success at ~1027-1031; truncation store at persist.c:1438 | adapter passes `written_lsn`; 1035 store moves into engine; -ENODEV case replaced by engine decision; 1438 store stays | +| ACKs processed on iomgr | `peer_ctrl_msg_handler` → `repl_ack_decode_and_dispatch` (ha.c:2632) → `repl_on_ack` call at ha.c:2748 | `commit_on_ack` feed point; must never block | +| Membership mutation points | repl.h:50-51 (`repl_add_standby`/`repl_remove_standby`), repl.h:76/79 (`repl_start_catchup`/`repl_complete_catchup`); removal call sites ha.c:3176, 3866 | `commit_on_membership_change` call sites | +| vtask pool default 8, `--vcpus` override | cluster.c:1076-1083 | `n_vcpus` input to `commit_engine_init`; init point after vtaskmgr sizing | +| `replicator_t` embedded in `persist_t` (`p->repl`); cluster reaches via `c->persist.repl` | persist.c:1032; ha.c:538, 2748 | engine reaches standby registry via its `persist_t*`; `commit_engine_init(ce, p, ...)` signature suffices | +| `ha_state_t` has `n_peers` and `raft_c`, but no repl pointer | ha.h:180-185 | add explicit `replicator_t *repl` back-pointer (raft_c only set by election path — not reliable for the gate) | +| repl.h/persist.h live in src/include (lib-visible); controller-local headers in src/controller/include | find results; cluster.h, worker.h | `commit.h` goes to src/controller/include; repl.h uses forward-declared `struct commit_engine *` to avoid dependency inversion | +| `repl_wait_majority_ack` callers: persist.c:1032 (walAck), config_repl.c:916 (configAck) | grep | signature gains `entry_lsn`; configAck branch untouched (out of boundary) | +| Existing tests encode old semantics | testsuite/test_repl_majority.c (walAck cases at :85-:177); meson controller_unit_test_src list at meson.build:74-110 | walAck cases must be updated; new test file registered in meson | +| `XCE_ERR_NOT_READY` defined | ha.c:35 (`= E_XCE_NOT_READY`) | reuse for admission-cap rejection | + +## Design Synthesis Outcomes (this slice) +- **Adapter placement** (brief-mandated): `repl_wait_majority_ack` stays as the shell; gains `entry_lsn` param because the replicator has no LSN knowledge; engine-less fallback retained ONLY for unit-test contexts and explicitly retired by ha-commit-barrier-rollout. Production walAck always goes through the engine. +- **Engine reachability**: forward-declared `struct commit_engine *ce` on `replicator_t` (keeps src/include/repl.h free of controller headers); engine instance embedded in `cluster_t`; init after vtask sizing + peer count known. +- **Standalone behavior change (intentional)**: with the engine wired, `n_peers <= 1` sync appends now advance `committed_lsn` (previously the -ENODEV path left it unmoved). Raft-correct (self-quorum), satisfies spec req 6.3; flagged in design. +- **Membership-shrink semantics**: re-evaluation = wake + re-check; no forced early-fail (umbrella 4.3 requires fail-not-confirm, satisfied by timeout; reconnection within the deadline may still legitimately commit). +- Review gate: design verified against the umbrella contract — interface verbatim, no contradiction with locked decisions, all 20 slice requirement IDs traced. diff --git a/.kiro/specs/ha-commit-engine/spec.json b/.kiro/specs/ha-commit-engine/spec.json new file mode 100644 index 0000000..be27494 --- /dev/null +++ b/.kiro/specs/ha-commit-engine/spec.json @@ -0,0 +1,23 @@ +{ + "feature_name": "ha-commit-engine", + "created_at": "2026-06-11T09:07:03Z", + "updated_at": "2026-06-11T09:07:03Z", + "language": "en", + "phase": "tasks-generated", + "umbrella": "ha-consistency-invariants", + "approvals": { + "requirements": { + "generated": true, + "approved": true + }, + "design": { + "generated": true, + "approved": true + }, + "tasks": { + "generated": true, + "approved": true + } + }, + "ready_for_implementation": true +} diff --git a/.kiro/specs/ha-commit-engine/tasks.md b/.kiro/specs/ha-commit-engine/tasks.md new file mode 100644 index 0000000..31b800d --- /dev/null +++ b/.kiro/specs/ha-commit-engine/tasks.md @@ -0,0 +1,80 @@ +# Implementation Plan: ha-commit-engine + +> TDD ordering per project steering (`testing.md`): every implementation sub-task is preceded by a testsuite sub-task that lands failing (RED) tests first. All new tests live in `testsuite/test_commit_engine.c` (brief-scoped single test file) plus targeted updates to `test_repl_majority.c` — this shared-file reality is why no `(P)` markers are applied: the test file and `repl.c` are touched by multiple groups, so the plan is sequential. +> Verify exact line numbers with grep before editing (research.md table has the verified anchors; files drift). + +- [ ] 1. Commit engine core: per-LSN evaluation and commit-index integrity +- [ ] 1.1 Write RED tests for per-LSN majority evaluation and commit-index integrity + - Create `testsuite/test_commit_engine.c` against a stub `persist_t` + `replicator_t` (XCE_TESTING pattern, AAA structure) and register it in `controller_unit_test_src` (meson.build); create `src/controller/include/commit.h` with the umbrella-verbatim interface (types + prototypes only) so tests compile + - Tests: with n_peers=3, a standby ACK for LSN M does not commit entry N>M (kills `acked_lsn > 0` counting); ACK watermark >= N from one standby plus self commits N; cumulative/out-of-order watermarks advance `committed_lsn` to the majority median, never past the highest appended LSN, never backwards; one far-lagging standby does not block majority commit; RETAIN mode returns 0 immediately without blocking + - Observable completion: build succeeds with the new header and test file; all new test cases FAIL (red) against a stub `commit.c` or unlinked implementation + - _Requirements: 1.2, 2.1, 2.2, 2.3, 5.1_ + +- [ ] 1.2 Implement the commit engine core to green + - Create `src/controller/commit.c` (add to meson controller sources): `commit_engine_init`/`commit_engine_fini` (validate args, one mutex + one condvar), `commit_on_ack` (bounded scan of active standbys' `acked_lsn` into the scratch array, sort descending, candidate = `arr[n_peers/2 - 1]` clamped to appended log, monotonic `max()` store into `persist->committed_lsn`, condvar broadcast — never blocks), `commit_submit(RETAIN)` immediate return + - Catch-up standbys (`in_catch_up`) excluded from the evaluation count (umbrella-locked conservative rule) + - XCE_TESTING asserts for monotonicity + - Observable completion: all task 1.1 tests PASS; engine is the only `committed_lsn` writer in `commit.c` paths + - _Requirements: 1.2, 2.1, 2.2, 2.3, 5.1_ + +- [ ] 2. WAIT mode, self-quorum, zero-peer rule, admission cap, own-term gate storage +- [ ] 2.1 Write RED tests for blocking-wait semantics and admission control + - Tests in `test_commit_engine.c`: WAIT blocks until majority ACK then returns 0; WAIT returns `-ETIMEDOUT` at deadline with `committed_lsn` unmoved past the entry; n_peers=1 → WAIT returns 0 immediately and `committed_lsn` advances to the entry; n_peers=3 with zero standby ACKs → `-ETIMEDOUT`, never success (short-circuit regression); with n_vcpus=8 and reserved=2, a 7th concurrent WAIT gets `-XCE_ERR_NOT_READY` while the 6 admitted waits proceed; cap floor `max(1, n_vcpus - reserved)` holds for tiny n_vcpus; while the cap is saturated, `commit_on_ack` still advances `committed_lsn` and completes admitted waiters; `writable_lsn` unset (0) → no gating; `commit_set_writable_lsn(G)` with G > entry → waiter completes only once `committed_lsn >= G` + - Observable completion: new cases FAIL (red) against the task-1 engine + - _Requirements: 1.1, 4.3, 4.4, 6.3, 7.1, 7.2, 7.3_ + +- [ ] 2.2 Implement WAIT mode, admission counter, and writable_lsn gate to green + - `commit_submit(WAIT)`: admission check (`inflight_waits >= max(1, n_vcpus - COMMIT_WAIT_RESERVED)` → `-XCE_ERR_NOT_READY`, distinct log message), `pthread_cond_timedwait` loop with per-LSN predicate (`committed_lsn >= lsn && (writable_lsn == 0 || committed_lsn >= writable_lsn)`), `-ETIMEDOUT` on deadline; `n_peers <= 1` immediate self-quorum success advancing `committed_lsn`; `commit_set_writable_lsn` stores the gate (no caller in this spec) + - XCE_TESTING assert: inflight counter within cap and never negative + - Observable completion: all task 2.1 tests PASS; cap is expressed only relative to the `n_vcpus` init argument (no absolute constant other than the reserved headroom) + - _Requirements: 1.1, 4.3, 4.4, 6.3, 7.1, 7.2, 7.3_ + +- [ ] 3. Membership-change re-evaluation +- [ ] 3.1 Write RED tests for membership re-evaluation + - Tests in `test_commit_engine.c`: a catch-up standby's ACK watermark does not count toward a pending entry; after clearing `in_catch_up` and calling `commit_on_membership_change`, the pending waiter completes if the standby's watermark covers it; on standby removal that makes majority unreachable, a pending WAIT never returns success and fails with `-ETIMEDOUT` at its deadline; `commit_on_membership_change` returns without blocking + - Observable completion: new cases FAIL (red) + - _Requirements: 4.1, 4.2_ + +- [ ] 3.2 Implement commit_on_membership_change to green + - Re-run the commit evaluation under the engine mutex against current registry state and broadcast the condvar so all pending waiters re-check their predicates; no forced early-fail (reconnection within the deadline may still commit — design decision) + - Observable completion: all task 3.1 tests PASS + - _Requirements: 4.1, 4.2_ + +- [ ] 4. Quorum-accounting fix: catch-up exclusion at the dispatch gate +- [ ] 4.1 Write RED tests for write-admission quorum counting + - Tests: `repl_active_standby_count` counts only slots with `ep != NULL && !in_catch_up`; `ha_has_write_quorum` with n_peers=3 returns false when the only connected standby is in catch-up, true with one active standby, false with zero connected; after simulated reconnect (registry restored) the gate accepts again with no reset call (stateless re-evaluation); n_peers=1 always true + - Declare `repl_active_standby_count` in src/include/repl.h so tests compile + - Observable completion: new cases FAIL (red) — current `ha_has_write_quorum` counts `standby_endpoints->count` including catch-up (grep ha.c for the current anchor near ha.c:1507) + - _Requirements: 3.1, 3.2, 3.3, 6.1, 6.2_ + +- [ ] 4.2 Implement the quorum-accounting fix to green + - Add `repl_active_standby_count(replicator_t *r)` to repl.c (under `r->lock`); add `replicator_t *repl` back-pointer to `ha_state_t` (ha.h); `ha_has_write_quorum` uses the helper when the back-pointer is wired, falls back to the existing `standby_endpoints` count when NULL (legacy test contexts); quorum condition itself unchanged (`active >= n_peers / 2`, `n_peers <= 1 → true`) + - Observable completion: all task 4.1 tests PASS; existing dispatch-gate tests still green + - _Requirements: 3.1, 3.2, 3.3, 6.1, 6.2_ + +- [ ] 5. Integration: wire the engine behind the job-submit sync path +- [ ] 5.1 Write RED integration tests for the ACK feed and the sync-append path + - Tests in `test_commit_engine.c`: `repl_on_ack` with a wired engine updates `acked_lsn` AND triggers commit evaluation (majority → `committed_lsn` advances, waiter wakes); `repl_start_catchup`/`repl_complete_catchup`/`repl_remove_standby`/`repl_add_standby` trigger re-evaluation; `persist_wal_sync_append` with wired engine returns 0 only on per-entry majority, returns `-ETIMEDOUT` when standbys' `acked_lsn` covers only an EARLIER entry (stale-ACK regression — connectivity/old ACKs never substitute), leaves `committed_lsn` unmoved on timeout, and for n_peers=1 returns 0 with `committed_lsn` advanced (replaces the old `-ENODEV` degraded path) + - Update `testsuite/test_repl_majority.c` walAck cases to wire an engine and assert per-LSN semantics; configAck cases byte-identical + - Observable completion: new/updated cases FAIL (red) against unwired production code + - _Requirements: 1.1, 1.2, 1.3, 2.1, 4.2, 4.4, 6.3_ + +- [ ] 5.2 Implement the repl-side wiring: ACK feed, membership hooks, adapter + - repl.h: forward-declare `struct commit_engine`, add `ce` pointer to `replicator_t`, declare `repl_set_commit_engine()`; add `uint64_t entry_lsn` parameter to `repl_wait_majority_ack` (update the config_repl.c:916 caller to pass 0 — configAck branch behavior untouched) + - repl.c: `repl_on_ack` calls `commit_on_ack(r->ce, slot_idx, acked_lsn)` after the `acked_lsn` store when wired; `repl_add_standby`/`repl_remove_standby`/`repl_start_catchup`/`repl_complete_catchup` call `commit_on_membership_change` when wired; walAck branch of `repl_wait_majority_ack` delegates to `commit_submit(ce, entry_lsn, COMMIT_MODE_WAIT, timeout_ms)` when wired, with the legacy counting kept only for `ce == NULL` test contexts and marked deprecated (retired by ha-commit-barrier-rollout) + - Observable completion: ACK-feed and membership-hook tests from 5.1 PASS; configAck tests unaffected + - _Depends: 2.2, 3.2_ + - _Requirements: 1.1, 4.2_ + +- [ ] 5.3 Implement engine instantiation and the sync-append path switch + - cluster.h/cluster.c: embed `commit_engine_t commit` in `cluster_t`; call `commit_engine_init(&c->commit, &c->persist, n_peers, n_vcpus)` + `repl_set_commit_engine` at the init point where both the vtask pool size (cluster.c:1082 anchor) and `ha->n_peers` are final; set the `ha_state_t.repl` back-pointer here; `commit_engine_fini` on teardown + - persist.c `persist_wal_sync_append`: pass `written_lsn` to the adapter; on the engine-wired path remove the `has_standbys → -ENODEV` special case and the `committed_lsn` store (persist.c:1035 anchor — the engine now owns advancement; truncation store at persist.c:1438 stays); return contract to callers: 0 / `-ETIMEDOUT` / `-XCE_ERR_NOT_READY` propagated through the existing job-submit error path + - Observable completion: all task 5.1 tests PASS, including stale-ACK regression and single-node `committed_lsn` advancement; job submit on a wired cluster confirms only on per-entry majority + - _Requirements: 1.1, 1.2, 1.3, 2.1, 4.4, 6.3_ + +- [ ] 6. Validation: full regression and dishonest-path audit +- [ ] 6.1 Run the full controller regression and audit the legacy paths + - Build and run the complete controller testsuite with ASAN (`/xce-build controller`); fix any regression introduced by the short-circuit removal or the `committed_lsn` ownership move (existing persist/repl/ha suites) + - Audit: grep confirms no production (engine-wired) walAck path reaches the `acked_lsn > 0` counting or the `n_active == 0 → success` branch; both survive only under the deprecated `ce == NULL` test fallback + - Observable completion: full testsuite green under ASAN; audit results recorded in the task completion notes + - _Requirements: 1.1, 1.2, 1.3, 2.1, 2.2, 2.3, 3.1, 3.2, 3.3, 4.1, 4.2, 4.3, 4.4, 5.1, 6.1, 6.2, 6.3, 7.1, 7.2, 7.3_ diff --git a/.kiro/specs/ha-config-bootstrap/spec.json b/.kiro/specs/ha-config-bootstrap/spec.json index fc3d56b..e4e514d 100644 --- a/.kiro/specs/ha-config-bootstrap/spec.json +++ b/.kiro/specs/ha-config-bootstrap/spec.json @@ -1,7 +1,7 @@ { "feature_name": "ha-config-bootstrap", "description": "Replace LSF-style priority election with Raft-style quorum voting, add majority-commit WAL and config replication, establish persistent control channels, and harden the controller startup sequence for full CP high-availability.", - "phase": "tasks-generated", + "phase": "implemented", "created_at": "2026-05-27T01:24:00-07:00", "updated_at": "2026-05-27T17:35:00-07:00", "language": "en", @@ -19,5 +19,6 @@ "generated": true, "approved": true } - } + }, + "note": "All tasks 1.x-11.x done (verified 2026-06-09 gap analysis). Known deviations: redirect fields never populated (dead end-to-end, successor-spec gated), WAL majority-commit covers WAL_JOB_SUBMIT only (sync-append coverage in ha-repl-hardening), commit timeout silently degrades (CP-vs-availability operator decision needed)." } diff --git a/.kiro/specs/ha-consistency-invariants/brief.md b/.kiro/specs/ha-consistency-invariants/brief.md new file mode 100644 index 0000000..6b96fc2 --- /dev/null +++ b/.kiro/specs/ha-consistency-invariants/brief.md @@ -0,0 +1,102 @@ +# Brief: ha-consistency-invariants + +## Governing Model (decision: 2026-06-10) + +XCE HA adopts **Raft as the consensus model and CP as the CAP stance**. This supersedes the earlier "No Raft" steering decision (the single-writer constraint is retained — the controller remains the sole log writer — but log commitment now follows Raft semantics, not just election). All consistency requirements in this spec are **deductions from the Raft paper + CP**, not ad-hoc rules: + +| Deduced rule | Raft / CP source | +|---|---| +| 1. No distinct "primary committing" state | Raft has exactly three server states: Follower, Candidate, Leader. A candidate winning an election becomes Leader immediately. Raft's answer to "new leader can't yet serve safely" is not a fourth state — it is the commit rule: a leader may only count own-term entries toward commitment (§5.4.2), conventionally satisfied by committing a no-op entry at term start. The commit barrier subsumes the transitional state. | +| 2. Majority ACK is the hard commit barrier; reject otherwise | Raft commit rule (§5.3): an entry is committed only when the leader has replicated it on a majority; `commitIndex` advances only on majority match, and the state machine applies entries only once committed. CP: a leader in a minority partition cannot commit — the correct behavior is reject/error to the caller, never local-apply-and-hope. | +| 3. Full-consistency best-effort while running | Raft leaders maintain per-follower progress (nextIndex/matchIndex) and continuously retry AppendEntries to ALL followers (§5.3); majority is the commit threshold, not the fan-out target. Lagging followers catch up via continuous log streaming or InstallSnapshot — driven by the leader, not gated on heartbeat round-trips. | + +XCE mapping: `committed_lsn` ≈ Raft `commitIndex`; WAL entries ≈ log entries; standby ACK ≈ AppendEntries success; snapshot transfer ≈ InstallSnapshot; `CTRL_PRIMARY_COMMITTING` ≈ a state Raft does not have. + +## Problem + +The HA controller's consistency model is inconsistent across operation types. Job submit goes through a majority-ACK commit barrier, but job state changes, queue control, and worker control are applied locally and replicated fire-and-forget. A primary that has lost quorum can still have in-flight writes "commit" locally, and a newly elected primary force-promotes after a 60s timeout even with zero converged standbys. The `ha-config-bootstrap` spec explicitly deferred this as the "CP-vs-availability operator decision"; the decision is now made by adopting CP: **reject, never degrade**. + +## Current State + +Audit of `src/controller/` (2026-06-10) found these violations of the Raft+CP deductions: + +### Rule 1 — drop the PRIMARY_COMMITTING / PRIMARY distinction +- `CTRL_PRIMARY_COMMITTING` (ha.h:59-65) is a transitional leader state set at `ha.c:505` (raft callback) and `ha.c:2248` (legacy path), checked in ~7 places. Raft has no such state. +- `ha_is_primary()` (ha.c:917) returns 0 in COMMITTING; `ha_should_redirect()` (ha.c:1655) redirects clients to a primary that does not exist yet → redirect loop during the committing window. +- `committing_timeout_fn` (ha.c:3092-3121) force-promotes to PRIMARY after 60s **even with zero converged standbys** — accepting writes with no replication (violates the Raft commit rule outright). + +### Rule 2 — majority-ACK is the hard commit barrier; reject otherwise +- Job state changes (start/finish/fail/stop/resume/update/ckpt/rusage) use `persist_wal_async` only — local apply + fire-and-forget broadcast, no majority wait (persist.c:1169). Same for queue control (persist.c:1199) and worker control (persist.c:1241). Only WAL_JOB_SUBMIT uses `persist_wal_sync_append` + `repl_wait_majority_ack` (persist.c:1003-1049). +- `ha_has_write_quorum` (ha.c:1507-1525) counts connected standbys including those in catch-up mode, but `repl_broadcast` skips catch-up standbys — the gate can pass while the write cannot actually reach quorum. (Raft equivalent: matchIndex, not connection count, is what commitment consults.) +- Config push timeout: `push_config_to_standbys` (config_repl.c:916-928) logs WARN on majority-ACK timeout but returns the ack count; caller (config_repl.c:1057) ignores it — config upgrade proceeds without confirmed majority. +- TOCTOU: quorum checked at dispatch gate only; `repl_wait_majority_ack` (repl.c:430-434) short-circuits to success when `n_active == 0`, so a write admitted before mass disconnect commits with primary-only durability. +- Quorum loss while PRIMARY blocks writes at the gate (correct CP direction) but combined with the n_active==0 short-circuit this leaves a hole. +- **Apply-before-commit (to verify in requirements phase)**: Raft applies entries to the state machine only after commit. Audit confirmed `committed_lsn` advances only on majority ACK for job submit, but whether the in-memory state mutation precedes the ACK on each path needs per-path verification; local WAL append before ACK is fine (that is the Raft log), in-memory apply before commit is not. + +### Rule 3 — full consistency best-effort while running +- `repl_broadcast` (repl.c:210-282) already fans out to ALL active standbys — matches Raft. +- Lagging standbys evicted to catch-up mode (pending_ack_count > MAX_PENDING_ACKS) only re-enter via the 3s heartbeat-driven decision loop (`ha_dispatch_repl_action_for_standby`, ha.c:1373) — catch-up is heartbeat-gated, not leader-driven continuous streaming as Raft prescribes; a busy primary lets catch-up standbys fall arbitrarily behind. + +## Desired Outcome + +1. Single leader state: winning an election transitions directly to `CTRL_PRIMARY`. `CTRL_PRIMARY_COMMITTING`, its whitelist branch, and `committing_timeout_fn` are removed. Post-election write safety comes from the Raft own-term commit rule (the universal commit barrier; optionally an explicit no-op entry committed at term start), not a special state. +2. Every cluster-state-changing operation (job submit, job state change, queue control, worker control, config push) commits only after majority ACK. On timeout or quorum loss the operation is **rejected with an error to the caller**. `committed_lsn` / `committed_config_tag` only advance on real majority — they are XCE's `commitIndex` and must behave like it. +3. Quorum accounting is honest and ACK-based: `ha_has_write_quorum` counts only standbys actually reachable for the write; majority is verified at ACK time (matchIndex-style), not just at the dispatch gate; `repl_wait_majority_ack` never succeeds with zero active standbys when `n_peers > 1`. +4. Full-consistency best-effort: broadcast remains all-standbys; catch-up streaming is leader-driven and continuous (no heartbeat round-trip gating), with snapshot fallback for standbys behind the oldest retained WAL. + +## Approach + +Chosen: **new single spec layered on ha-wal-replication's ACK machinery, with the Raft paper (§5.3, §5.4) as the requirements authority**. + +The recently built WalAckReply / majority-ack / committed_lsn infrastructure (ha-wal-replication tasks 3.x-5.x) is the enforcement mechanism; this spec generalizes it from WAL_JOB_SUBMIT to all state-changing WAL types, makes rejection (not degradation) the universal timeout behavior, and then deletes the now-redundant COMMITTING state. + +Order matters: implement the universal commit barrier (Rule 2) FIRST, then merge the states (Rule 1) — merging first would open a window where a fresh primary accepts unreplicated writes, violating the own-term commit rule. + +Rejected alternatives: +- Extending ha-wal-replication in place — scope creep on a mid-implementation spec; state-machine surgery is a different boundary than WAL transport. +- Multi-spec split (state merge / write barrier / catch-up as 3 specs) — the pieces are safety-interlocked (see ordering above); splitting risks landing Rule 1 without Rule 2. + +## Scope + +- **In**: + - Route WAL_JOB_* state changes, WAL_QUEUE_CTRL, WAL_WORKER_CTRL through the sync majority-ACK path; reject on timeout. + - Verify (and fix where violated) apply-after-commit ordering on each write path. + - Config push: error on majority-ACK timeout, propagate to caller, fail the upgrade request. + - Fix `ha_has_write_quorum` catch-up accounting; verify quorum at ACK completion; remove the n_active==0 success short-circuit for n_peers > 1. + - Remove `CTRL_PRIMARY_COMMITTING`: direct ELECTING→PRIMARY transition, delete committing whitelist branch and `committing_timeout_fn`, fix `ha_is_primary` / `ha_should_redirect` semantics; evaluate explicit no-op own-term commit at promotion. + - Leader-driven continuous catch-up streaming (decouple from heartbeat round-trip). + - Tests: per-WAL-type commit-barrier tests, quorum-loss rejection tests, election→write-availability convergence test, catch-up progress test. +- **Out**: WAL transport/encoding (ha-wal-replication owns it); election/vote logic (raft-library owns it — already Raft-conformant); single-node (`n_peers <= 1`) behavior — self-quorum stays as-is (a 1-node Raft cluster's majority is 1); checkpoint replication (deliberately local-only — snapshots are per-node in Raft too); automatic primary step-down on quorum loss (Raft leaders in a minority partition also stay leader but cannot commit — blocking writes satisfies CP; step-down-on-silence is a possible follow-on optimization). + +## Boundary Candidates + +- Commit-barrier generalization (persist.c sync/async split, repl.c ack wait) +- Quorum accounting + TOCTOU closure (ha.c gate, repl.c ack path) +- State-machine simplification (ha.c enum, transitions, timeout removal) +- Leader-driven catch-up (config_repl.c streaming, ha.c decision loop) + +## Out of Boundary + +- Raft vote/election correctness (raft-library) +- WAL wire format and standby apply path (ha-wal-replication) +- Worker/scheduler reconnect-on-failover (worker-join-refactor / P2.5) +- Read consistency / leader leases (Raft §8 read-only optimization — future spec) +- Performance tuning of sync-commit latency (acceptable cost of CP; measure, don't optimize, in this spec) + +## Upstream / Downstream + +- **Upstream**: ha-wal-replication (ACK machinery, committed_lsn — must complete its remaining tasks first), ha-repl-hardening (payload data plane), raft-library (become_leader callback signature). +- **Downstream**: read-consistency / lease work; operator-facing degraded-mode metrics; possible primary step-down-on-quorum-loss spec; steering update (product.md decision log — "No Raft" superseded, done at discovery time). + +## Existing Spec Touchpoints + +- **Extends behavior introduced by**: ha-wal-replication (generalizes its majority-ack from job-submit to all WAL types), ha-config-bootstrap (resolves its documented "commit timeout silently degrades" deviation as REJECT per CP). +- **Adjacent**: ha-heartbeat-liveness (heartbeat period interacts with catch-up loop), raft-library (election→PRIMARY transition point changes). + +## Constraints + +- C11, vtask async I/O — commit barrier must not block vtask handlers; reuse the existing delaymgr-based `repl_wait_majority_ack` pattern. +- TDD mandatory: testsuite/ tests before C changes; existing convergence tests in `test_ha_connection_reuse.c` and ha-wal-replication tests must stay green. +- Single-writer model preserved: the controller remains the sole log writer (XCE's simplification of Raft — no concurrent client proposals); this spec narrows when the single writer may commit, it does not add writers. +- Semantics for `n_peers <= 1` (standalone) unchanged: self-quorum, no barrier (consistent with single-node Raft). +- Where this brief and the Raft paper disagree, the Raft paper wins; deviations must be documented in the design with justification. diff --git a/.kiro/specs/ha-consistency-invariants/design.md b/.kiro/specs/ha-consistency-invariants/design.md new file mode 100644 index 0000000..ddce993 --- /dev/null +++ b/.kiro/specs/ha-consistency-invariants/design.md @@ -0,0 +1,421 @@ +# Design: ha-consistency-invariants + +## Overview + +**Purpose**: This feature gives operators of multi-node XCE controller clusters a uniform Raft+CP consistency contract: every cluster-state-changing operation is durable on a majority before it is confirmed, operations that cannot reach majority are rejected (requests) or retained until committed (facts), and leadership is a single role with no weaker transitional state. + +**Users**: Cluster operators gain predictable failover semantics (no acknowledged change is ever lost); client/API consumers gain honest confirmations; the scheduler is protected from acting on uncommitted state. + +**Impact**: Removes `CTRL_PRIMARY_COMMITTING` from the HA state machine; generalizes the majority-ACK commit barrier from WAL_JOB_SUBMIT to all state-changing WAL types via a new commit engine; fixes quorum accounting (per-entry ACK verification, catch-up exclusion, TOCTOU closure); adds a commit-watermark egress filter to dataex; converts demotion into truncate-and-self-restart; makes catch-up ACK-driven. + +### Goals +- Majority ACK as the hard commit barrier for all state-changing operations (`committed_lsn` ≈ Raft commitIndex) +- Single leader role; post-election write safety via own-term no-op commit (Raft §5.4.2) +- Facts (worker-reported transitions) retained and retried until committed — never dropped while the primary runs and leads +- Cluster-wide single-outcome convergence for uncommitted suffixes (truncate + self-restart on demotion) +- Full fan-out with leader-driven, ACK-continued catch-up + +### Non-Goals +- Election/vote correctness (raft-library), WAL wire format (ha-wal-replication) +- Read consistency / leases — status queries may observe provisional in-memory state (documented deviation) +- Worker rejoin job-state re-sync (roadmap backlog; designated backstop for facts lost across failover) +- Entity-bearing snapshots; primary step-down on quorum loss; checkpoint replication +- Performance tuning of commit latency (measure only) + +## Boundary Commitments + +### This Spec Owns +- Commit semantics: when `committed_lsn` / `committed_config_tag` advance, and what confirmation means for every state-changing operation on the primary +- The commit engine (`commit.c`): per-LSN ACK evaluation, waiter completion, own-term gate, admission cap +- Operation classification (request-shaped vs fact-shaped) and the per-WAL-type write path +- HA leader-role lifecycle simplification (promotion no-op, COMMITTING removal, demotion truncate+restart) +- Quorum accounting used by the dispatch gate and commit evaluation +- The commit-watermark egress rule for scheduler-bound exports +- Quorum-loss observability logging + +### Out of Boundary +- Vote RPCs, term management, freshness gates (raft-library); WalAckReply wire format and standby apply mechanics (ha-wal-replication) +- Worker protocol changes of any kind (rejoin re-sync is a future spec) +- Snapshot file format (sentinel stays as-is); dual-zarray COW wiring +- apiserver/Go-tier behavior (error codes pass through existing envelopes) + +### Allowed Dependencies +- `repl.c` standby registry and `acked_lsn` per-standby tracking (ha-wal-replication machinery) — the commit engine consumes ACK events, never manages connections +- `persist.c` WAL append/replay/truncation primitives; `persist_recover` boot path (reused by self-restart) +- iomgr/vtaskmgr/delaymgr threading rules per `ha-async-io.md` (ACK processing stays on iomgr; blocking waits only on vtask threads) +- Dependency direction: `include/commit.h` depends only on libc/stdatomic types. `commit.c` is called BY `persist.c` (append), `repl.c` (ACK events), and `ha.c` (promotion/demotion); it calls into none of them except via registered callbacks. + +### Revalidation Triggers +- Any change to `acked_lsn` semantics or WalAckReply payload (ha-wal-replication) → re-verify commit evaluation +- Worker-rejoin-resync spec landing → re-verify idempotency guards and fact replay ordering +- Entity-bearing snapshots landing → re-evaluate demotion self-restart vs snapshot-based rebuild +- Any new state-changing opcode/WAL type → must be classified request/fact and routed through the commit engine + +## Architecture + +### Existing Architecture Analysis +- Single-writer model: only the primary appends WAL entries; standbys ACK (`acked_lsn` = matchIndex equivalent already exists per `standby_conn_t`) +- Hooks fire on `HOOK_AFTER_EVENT` after in-memory mutation — retained as-is under the provisional-state model (in-memory state is a provisional view; the committed log is authoritative; commit gates confirmation and irrevocable egress, not mutation) +- ACKs are decoded on the iomgr thread (`peer_ctrl_msg_handler` → `repl_on_ack`) — blocking commit-waiters can always be woken; pool exhaustion is throughput-only +- `repl_wait_majority_ack` currently counts `acked_lsn > 0` (any ACK ever) — replaced by per-entry evaluation in the commit engine +- Technical debt addressed: TOCTOU between dispatch gate and ACK; catch-up standbys counted toward write quorum; config push ACK result ignored; `committing_timeout_fn` force-promotion + +### Architecture Pattern & Boundary Map + +```mermaid +graph TB + subgraph clients + API[apiserver client] + WK[worker notify] + SCHED[scheduler] + end + subgraph controller_primary + GATE[ha dispatch gate] + HOOKS[persist hooks] + WAL[persist WAL append] + CE[commit engine] + REPL[repl broadcast] + DX[dataex egress filter] + HA[ha role lifecycle] + end + STBY[standbys] + + API --> GATE + WK --> GATE + GATE --> HOOKS + HOOKS --> WAL + WAL --> CE + WAL --> REPL + REPL --> STBY + STBY -- WalAck on iomgr --> CE + CE -- committed_lsn --> DX + DX --> SCHED + HA -- promote noop / demote restart --> CE +``` + +**Architecture Integration**: +- Selected pattern: single commit engine as the authority for `committed_lsn` advancement; all write paths converge on it with one of two completion modes +- Existing patterns preserved: hook-based persistence dispatch, full fan-out broadcast, heartbeat-driven repl decision loop (extended with ACK-driven continuation), `errnox` early-return error style +- New component rationale: `commit.c` exists because three requirements families (2.x, 3.x, 5.x) are one capability; placing it in `repl.c` would bloat connection management with consensus logic +- Steering compliance: never block iomgr; blocking waits only on vtask threads with admission cap relative to `n_vcpus`; TDD with testsuite/ tests first + +### Technology Stack + +| Layer | Choice / Version | Role in Feature | Notes | +|-------|------------------|-----------------|-------| +| Backend / Services | C (gnu17), pthreads, stdatomic | commit engine, HA lifecycle | no new dependencies | +| Data / Storage | existing WAL segments (persist.c) | log = authoritative state + fact queue | new WAL_NOOP entry type, no schema change | +| Messaging / Events | existing Cap'n Proto WalAckReply | ACK transport | no .capnp changes | + +## File Structure Plan + +### Directory Structure +``` +src/controller/ +├── commit.c # NEW — commit engine: per-LSN ACK evaluation, waiter registry, +│ # own-term gate, admission cap, commit-index advancement +├── include/commit.h # NEW — commit engine public API (controller-internal) +├── ha.c # MODIFIED — promotion/demotion lifecycle, gate, quorum accounting +├── ha.h # MODIFIED — remove CTRL_PRIMARY_COMMITTING, add own-term fields +├── persist.c # MODIFIED — write-path classification, WAL_NOOP, commit-engine calls +├── repl.c # MODIFIED — repl_on_ack feeds commit engine; legacy wait removed +├── repl.h # MODIFIED — ack callback signature +├── config_repl.c # MODIFIED — config barrier error propagation; ACK-driven catch-up +├── job.c # MODIFIED — submit_lsn tagging, mark_job_* idempotency guards +├── dataex.c # MODIFIED — egress watermark filter in collect path +└── testsuite/ + ├── test_commit_engine.c # NEW — per-LSN majority, own-term gate, admission cap, monotonicity + ├── test_ha_role_lifecycle.c # NEW — direct promotion, no-op commit, demotion truncate+restart seam + └── test_egress_filter.c # NEW — uncommitted submit excluded from collect +src/include/persist.h # MODIFIED — WAL_NOOP type, classification enum +``` + +### Modified Files (what and why) +- `ha.c/ha.h` — delete COMMITTING state, watchdog (`committing_timeout_fn`), `ha_check_majority_convergence`, `repl_ack_count`; promotion appends no-op; `ha_has_write_quorum` excludes catch-up standbys; demotion path truncates + self-restarts; quorum-loss transition logging +- `persist.c` / `include/persist.h` — per-WAL-type classification table drives sync-wait vs fact-register; `WAL_NOOP` append/replay (replay = no-op); truncation unchanged +- `repl.c/repl.h` — `repl_on_ack` forwards `(ep, acked_lsn)` to `commit_on_ack`; `repl_wait_majority_ack`'s counting logic retired in favor of commit-engine evaluation (function shell may remain as adapter) +- `config_repl.c` — `push_config_to_standbys` returns `-ETIMEDOUT` on missed majority; caller fails the upgrade request; `ha_stream_wal_to_standby` continuation on walAck instead of next heartbeat +- `job.c` — `job_t` gains `submit_lsn`; `mark_job_*` gain state-transition guards (no DONE→RUN, idempotent re-apply) +- `dataex.c` — `collect_jobs` (scheduler export path only) skips jobs with `submit_lsn > committed_lsn` + +## System Flows + +### Request-shaped write (e.g., job submit) + +```mermaid +sequenceDiagram + participant C as client + participant V as vtask thread + participant CE as commit engine + participant R as repl broadcast + participant S as standby + participant IO as iomgr thread + C->>V: state-changing request + V->>V: gate check incl write quorum + V->>V: mutate in-memory (provisional) + V->>CE: append WAL entry lsn=N, mode=WAIT + CE->>CE: admission cap check + V->>R: broadcast entry N + R->>S: wal entry N + V->>CE: block on commit(N) with timeout + S->>IO: WalAck lsn>=N + IO->>CE: commit_on_ack + CE->>CE: majority for N? advance committed_lsn + CE-->>V: wake waiter (committed | timeout) + alt committed + V->>C: success + else timeout or quorum lost + V->>C: error (operation failed) + end +``` + +Key decisions: admission cap rejects (NOT_READY) before blocking when `inflight_waits >= n_vcpus - COMMIT_WAIT_RESERVED`; majority is evaluated against the entry's LSN (`acked_lsn >= N` per standby, plus self), re-verified at ACK time — gate-time connectivity never substitutes (4.2, 4.3). + +### Fact-shaped write (worker-reported transition) — log-is-the-queue +Same path until the commit engine: mode=RETAIN. No blocking wait, no timeout; the vtask returns immediately after append+broadcast. The uncommitted suffix is re-delivered to lagging standbys by catch-up streaming; `committed_lsn` advances as ACKs arrive. The fact is "pending" purely by virtue of `lsn > committed_lsn` (2.8). Idempotency guards in `mark_job_*` make replay/duplicate application safe. + +### Role lifecycle (after this spec) + +```mermaid +stateDiagram-v2 + [*] --> INIT + INIT --> STANDBY: heartbeat seen + INIT --> ELECTING: timeout + ELECTING --> PRIMARY: quorum won, truncate to safe_lsn, append noop + ELECTING --> STANDBY: lost or higher term + PRIMARY --> RESTART: higher term seen, truncate above committed_lsn + STANDBY --> ELECTING: primary lost + RESTART --> INIT: process self restart via boot recovery +``` + +Promotion: `raft_cb_become_leader` sets `CTRL_PRIMARY` directly, registers persistence hooks, appends a `WAL_NOOP` entry of the current term, and broadcasts it. Request-shaped writes are accepted immediately and simply wait behind the contiguous commit index (the no-op commits first); status queries report primary (1.4). No wall-clock promotion/force path exists (1.5, 3.3). + +Demotion: on observing a higher term while PRIMARY, the node truncates its WAL above `committed_lsn`, logs the event, and self-restarts; boot recovery (`persist_recover` + replay of the committed prefix) rebuilds in-memory state, discarding provisional entries (2.5, 2.7). Crash without truncation: the restarted node replays its full local WAL, but on rejoin as standby, if its local WAL tip exceeds the primary's replication boundary, it truncates above the primary-reported `committed_lsn` and self-restarts once (rejoin reconciliation — extends the existing RDHUP truncation pattern). + +## Requirements Traceability + +| Requirement | Summary | Components | Flows | +|-------------|---------|------------|-------| +| 1.1, 1.2 | direct PRIMARY, single leader role | HA Role Lifecycle | role lifecycle | +| 1.3 | no redirect from primary | HA Role Lifecycle (`ha_should_redirect`) | — | +| 1.4 | status reports primary pre-own-term-commit | HA Role Lifecycle | role lifecycle | +| 1.5 | no wall-clock leadership change | HA Role Lifecycle (watchdog deleted) | — | +| 2.1 | confirm only after majority ACK | Commit Engine, Write-Path Classification | request write | +| 2.2 | requester ops fail on commit timeout | Commit Engine (WAIT mode), Write-Path Classification | request write | +| 2.3 | no commit-index advance without majority | Commit Engine | request write | +| 2.4 | provisional state: no confirm, no irrevocable export | Commit Engine, Egress Filter | request write | +| 2.5 | single outcome convergence incl. memory | Demotion Convergence | role lifecycle | +| 2.6 | monotonic commit index | Commit Engine | — | +| 2.7 | state reconstructible from committed log | Demotion Convergence (boot recovery reuse) | role lifecycle | +| 2.8 | facts retained+retried until committed | Commit Engine (RETAIN mode), Idempotency Guards | fact write | +| 3.1 | no confirmation before own-term entry commits | Commit Engine own-term gate, no-op at promotion | role lifecycle | +| 3.2 | pre-own-term requests: barrier or NOT_READY | Commit Engine own-term gate | request write | +| 3.3 | no timeout bypassing 3.1 | HA Role Lifecycle (watchdog deleted) | — | +| 4.1 | quorum counts only members able to receive | Quorum Accounting | — | +| 4.2 | commit requires actual per-entry ACKs | Commit Engine | request write | +| 4.3 | post-acceptance quorum shrink → fail | Commit Engine (ACK-time evaluation, timeout) | request write | +| 4.4 | never zero-peer majority when n_peers>1 | Commit Engine | — | +| 5.1–5.3 | config change commit barrier | Config Barrier | — | +| 6.1 | replicate to all reachable standbys | existing `repl_broadcast` (unchanged, verified by test) | — | +| 6.2 | catch-up without per-step heartbeat | ACK-Driven Catch-up | — | +| 6.3, 6.4 | snapshot fallback, re-include on catch-up | existing paths (unchanged, verified by test) | — | +| 6.5 | lag never blocks majority confirmation | Commit Engine (majority threshold only) | — | +| 7.1 | reject state changes without quorum | Quorum Accounting + Commit Engine | — | +| 7.2 | log quorum-loss enter/exit | Quorum Observability | — | +| 7.3 | serve status + replication while degraded | dispatch gate (existing allowlist, verified by test) | — | +| 7.4 | auto-resume on quorum restore | Quorum Accounting (stateless gate re-evaluation) | — | +| 7.5 | standalone self-quorum unchanged | Commit Engine (n_peers<=1 short-circuit preserved) | — | + +## Components and Interfaces + +| Component | Layer | Intent | Req Coverage | Key Dependencies | Contracts | +|-----------|-------|--------|--------------|------------------|-----------| +| Commit Engine | controller/commit.c | authority for commit-index advancement and completion | 2.1–2.4, 2.6, 2.8, 3.1, 3.2, 4.2–4.4, 6.5, 7.5 | repl ACK events (P0), persist append (P0) | Service, State | +| Write-Path Classification | controller/persist.c | route each WAL type to WAIT or RETAIN mode | 2.1, 2.2, 2.8 | Commit Engine (P0), hooks (P0) | Service | +| HA Role Lifecycle | controller/ha.c | direct promotion + no-op, COMMITTING removal, redirect fix | 1.1–1.5, 3.1, 3.3 | raft-library callbacks (P0), Commit Engine (P0) | State | +| Quorum Accounting | controller/ha.c | honest gate-time quorum, catch-up exclusion | 4.1, 7.1, 7.4 | repl registry (P0) | Service | +| Config Barrier | controller/config_repl.c | config majority-ACK with error propagation | 5.1–5.3 | Commit Engine pattern (P1) | Service | +| Egress Filter | controller/dataex.c, job.c | exclude uncommitted submits from scheduler export | 2.4 | committed_lsn (P0) | Service | +| Demotion Convergence | controller/ha.c | truncate + self-restart; rejoin reconciliation | 2.5, 2.7 | persist truncation + recovery (P0) | State | +| ACK-Driven Catch-up | controller/config_repl.c | continue streaming on walAck | 6.2 | repl/iomgr (P0) | Event | +| Quorum Observability | controller/ha.c | log degraded-state transitions | 7.2 | — | — | +| Idempotency Guards | controller/job.c | safe duplicate/replay of fact transitions | 2.8 (supports 2.5, future resync) | — | Service | + +### Commit Engine (`commit.c` / `include/commit.h`) + +| Field | Detail | +|-------|--------| +| Intent | Single authority for per-entry commit evaluation, `committed_lsn` advancement, and waiter completion | +| Requirements | 2.1–2.4, 2.6, 2.8, 3.1, 3.2, 4.2–4.4, 6.5, 7.5 | + +**Responsibilities & Constraints** +- Owns advancement of `persist->committed_lsn` (the atomic stays in `persist_t`; only the commit engine stores to it after init/truncation paths) +- Commit rule (Raft §5.3): entry N is committed when `count(self + standbys with acked_lsn >= N) > n_peers / 2`; advancement is contiguous and monotonic (2.6) +- Own-term gate: `writable_lsn` = LSN of the promotion no-op; completion (confirmation) is withheld for any entry until `committed_lsn >= writable_lsn` (3.1, 3.2) +- Admission cap: at most `n_vcpus - COMMIT_WAIT_RESERVED` (default reserved = 2) concurrent WAIT-mode blockers; excess requests fail fast with `-XCE_ERR_NOT_READY`. Expressed relative to `n_vcpus` only — never absolute (operator tunes `--vcpus`) +- `n_peers <= 1`: self-ACK constitutes majority; WAIT mode returns immediately (7.5). For `n_peers > 1`, zero peer ACKs never commit (4.4) — the legacy `n_active == 0 → success` short-circuit is removed + +**Dependencies** +- Inbound: `repl_on_ack` (iomgr thread) — ACK events (P0); `persist_wal_*` append paths — entry registration (P0); `ha.c` — promotion no-op LSN, demotion reset (P0) +- Outbound: none (callbacks only); signals waiters via condvar broadcast with per-LSN predicates + +**Contracts**: Service [x] / State [x] + +##### Service Interface +```c +/* include/commit.h — all functions thread-safe; _on_ack callable from iomgr (non-blocking) */ +typedef enum { COMMIT_MODE_WAIT, COMMIT_MODE_RETAIN } commit_mode_t; + +int commit_engine_init(commit_engine_t *ce, persist_t *p, int n_peers, int n_vcpus); +void commit_engine_fini(commit_engine_t *ce); + +/* Register entry at append time. RETAIN returns 0 immediately. + * WAIT blocks up to timeout_ms: 0 = committed; -ETIMEDOUT = not committed + * (entry remains in log; outcome resolves per 2.5); -XCE_ERR_NOT_READY = + * admission cap exceeded or own-term gate unmet at entry. */ +int commit_submit(commit_engine_t *ce, uint64_t lsn, commit_mode_t mode, + uint32_t timeout_ms); + +/* iomgr path: record standby ACK, evaluate majority, advance committed_lsn + * contiguously, wake satisfied waiters. Never blocks. */ +void commit_on_ack(commit_engine_t *ce, int standby_idx, uint64_t acked_lsn); + +/* Promotion: set own-term gate to the no-op entry's LSN. */ +void commit_set_writable_lsn(commit_engine_t *ce, uint64_t noop_lsn); + +/* Quorum-membership change (standby add/remove/catch-up transition): + * re-evaluate pending entries; standbys in catch-up are excluded. */ +void commit_on_membership_change(commit_engine_t *ce); +``` +- Preconditions: entries submitted in LSN order (single-writer guarantees this) +- Postconditions: `committed_lsn` never decreases; never exceeds highest majority-acked contiguous LSN +- Invariants: no waiter completes successfully while `committed_lsn < its lsn` or `committed_lsn < writable_lsn` + +##### State Management +- State: per-standby view delegated to `standby_conn_t.acked_lsn` (no duplication); internal: sorted matchIndex scratch array, waiter list (lsn, condvar shared, mode), `writable_lsn`, inflight-wait counter +- Concurrency: one mutex + one condvar (broadcast on `committed_lsn` advance; waiters check per-LSN predicate); `committed_lsn` read lock-free via existing atomic + +**Implementation Notes** +- Integration: `repl_wait_majority_ack` becomes a thin adapter calling `commit_submit(WAIT)` during migration, then call sites move to the engine directly +- Validation: assert monotonicity under `XCE_TESTING`; counter for retained-uncommitted entries exposed in logs +- Risks: condvar broadcast storms under high write concurrency — acceptable at current scale; revisit with async continuation (out of scope) + +### Write-Path Classification (`persist.c`) + +| Field | Detail | +|-------|--------| +| Intent | Route every state-changing WAL type to its commit mode at the existing hook seam | +| Requirements | 2.1, 2.2, 2.8 | + +Classification (verified against call sites during implementation; table is the contract): + +> **SUPERSEDED IN PART (2026-06-11, cross-spec review)**: call-site verification during sub-spec generation found WAL_JOB_STOP/RESUME/UPDATE/FAIL originate from worker notify (fact-shaped, RETAIN) — the client-control intent of stop/resume is realized by the handler-level barrier in `do_jobcontrol_op` per the Reply-Ordering Contract below, which stands unchanged. The verified controlling table lives in `ha-commit-barrier-rollout/design.md` §Classification (see also its research.md §2). Rows below marked with the original assumption are retained for history: + +| WAL type | Shape | Mode | Failure behavior | +|----------|-------|------|------------------| +| WAL_JOB_SUBMIT | request (client) | WAIT | error to client (existing path) | +| WAL_JOB_STOP / RESUME | request (client job control) | WAIT | error to client | +| WAL_QUEUE_CTRL | request (client) | WAIT | error to client | +| WAL_WORKER_CTRL join/update | request (worker, replied) | WAIT | error reply to worker | +| WAL_JOB_START / FINISH / FAIL / RUSAGE / CKPT / PREASON | fact (worker notify) | RETAIN | none — retained until committed | +| WAL_WORKER_CTRL dead | fact (controller-detected) | RETAIN | none | +| WAL_NOOP | internal (promotion) | RETAIN | none — gates writability when committed | +| WAL_CHECKPOINT | local-only | none | unchanged (not replicated, by design) | + +**Reply-Ordering Contract (commit-first, then reply)** +- For every request-shaped operation (job control, queue control, worker join/update), the handler sequence is fixed: validate → mutate (provisional) → WAL append → `commit_submit(WAIT)` → **reply**. No success reply may be sent to the requester before `commit_submit` returns 0; on non-zero return the handler replies with the error (2.1, 2.2). +- Known reply-before-commit call sites to restructure: `do_jobcontrol_op` (job.c:921-934 — replies after mutation with only async WAL) and any queue/worker handlers following the same pattern. `handle_jobsubmit` (job.c:563-578) is the reference implementation of the correct ordering. +- `handle_jobdispatch` (job.c:459-471 — replies status=0 to the scheduler before processing allocations) is classified during implementation: if its allocations produce request-shaped state changes, the early reply must move behind the barrier; if its outcomes are fact-shaped (per-job dispatch results delivered via `notify_dispatch`), the early reply is an ACK-of-receipt and may stand. Task-level verification required; the classification assert enforces the outcome. + +**Implementation Notes** +- Integration: `persist_job_hook_fun` / `persist_queue_hook_fun` / `persist_worker_hook_fun` consult the table; `persist_wal_async` survives only as the RETAIN fast path (append + broadcast + register) +- Validation: a debug assert rejects any unclassified WAL type (revalidation trigger for new opcodes); integration tests assert no success reply is observable before `committed_lsn` covers the operation's entry +- Risks: reply restructuring touches every control handler in job.c/queue paths — mechanical but must be swept exhaustively; a missed site silently violates 2.1 + +### HA Role Lifecycle (`ha.c` / `ha.h`) + +| Field | Detail | +|-------|--------| +| Intent | Direct ELECTING→PRIMARY with own-term no-op; remove the transitional state and its timeout | +| Requirements | 1.1–1.5, 3.1, 3.3 | + +**Responsibilities & Constraints** +- `raft_cb_become_leader`: truncate to `safe_committed_lsn` (existing), set `CTRL_PRIMARY`, register persistence hooks (moved from `ha_promote_to_primary`), append+broadcast WAL_NOOP, call `commit_set_writable_lsn(noop_lsn)` +- Deletions: `CTRL_PRIMARY_COMMITTING` enum value, dispatch-gate COMMITTING branch, `committing_timeout_fn` + watchdog arming, `ha_check_majority_convergence`, `repl_ack_count` / `ha_repl_ack_received`; `ha_is_primary` / `ha_should_redirect` / vote-deny checks reduce to the single PRIMARY role +- Heartbeat re-arm condition drops the COMMITTING term; standby state reports continue to drive the catch-up decision loop unchanged + +**Contracts**: State [x] — role transitions per the lifecycle diagram; no other component may observe COMMITTING after this spec + +**Implementation Notes** +- Integration: legacy/XCE_TESTING election path (`ha_elect_evaluate_and_signal`) updated symmetrically; `cluster_init_phase2` call point unchanged +- Validation: existing convergence tests retargeted from COMMITTING→PRIMARY transition to noop-commit gating +- Risks: test fixtures referencing CTRL_PRIMARY_COMMITTING across the suite — mechanical but broad; sweep required + +### Quorum Accounting (`ha.c`) +Summary-only: `ha_has_write_quorum` counts standbys that are connected AND not `in_catch_up` (4.1); evaluated at the dispatch gate for fast rejection (7.1) and re-evaluated authoritatively by the commit engine at ACK time (4.2, 4.3); stateless, so quorum restoration auto-resumes acceptance (7.4). Transition logging lives here (see Quorum Observability). + +### Config Barrier (`config_repl.c`) +Summary-only: `push_config_to_standbys` returns `-ETIMEDOUT` when majority ACK is not reached within the commit timeout; `committed_config_tag` does not advance (already correct); the `upgradeConfig` caller propagates the error to the requester and fails the upgrade (5.1–5.3). Uses the same majority arithmetic as the commit engine (shared helper) but tracks `acked_config_lsn`/tag — config remains a parallel, simpler track (one in-flight config change at a time). + +### Egress Filter (`dataex.c`, `job.c`) +Summary-only: `job_t` gains `uint64_t submit_lsn` (set when the submit entry is appended). The scheduler export path (`collect_jobs` for dataex push/pull) skips jobs with `submit_lsn > committed_lsn` (2.4 — prevents dispatch of a job whose entry may never commit). Status/API query paths are intentionally NOT filtered (documented deviation; read consistency out of scope). Replay/standby-restored jobs carry their entry LSN (≤ committed by definition). + +### Demotion Convergence (`ha.c`) +Summary-only: on higher-term observation while PRIMARY (`raft_cb_become_follower` from PRIMARY): disable persistence hooks, truncate WAL above `committed_lsn`, WARN-log with both LSNs, then self-restart the process (re-exec of saved argv; under `XCE_TESTING`, a restart hook seam is invoked instead). Boot recovery replays only the surviving committed prefix → provisional in-memory state is discarded (2.5, 2.7). Rejoin reconciliation: a standby whose local WAL tip exceeds the primary's reported committed boundary truncates above the primary's `committed_lsn` (existing RDHUP truncation generalized to the rejoin/hello path) and self-restarts once. + +### ACK-Driven Catch-up (`config_repl.c`) +Summary-only: catch-up streaming sends a bounded batch window; receipt of a walAck from a catch-up standby (iomgr) schedules the next batch immediately via a delaymgr task, instead of waiting for the next heartbeat reply (6.2). Heartbeat-driven evaluation remains as the fallback initiator and for snapshot decisions (6.3); `repl_complete_catchup` re-inclusion unchanged (6.4). + +### Quorum Observability + Idempotency Guards +Summary-only: quorum-loss/restore transitions WARN-logged once per transition with connected/required counts (7.2). `mark_job_start/finish/fail/...` gain transition guards: identical-state re-application is a logged no-op; backward transitions (terminal→running) are rejected with a WARN (supports 2.8 retry/replay and the future rejoin-resync). + +## Data Models + +### Domain Model (changes only) +- **WAL entry** (unchanged format; new type `WAL_NOOP` with empty payload — replay is a no-op, exists purely to commit a current-term entry) +- **job_t**: + `submit_lsn` (entry LSN of its submit record) — drives the egress filter; not persisted separately (recomputed at replay from the entry being applied) +- **commit_engine_t**: in-memory only (commit state is volatile, Raft-conformant — recovered via rejoin reconciliation, never persisted) +- Invariants: `committed_lsn` monotonic, contiguous; `writable_lsn` ≤ first confirmable LSN per term; an entry is confirmed ⇔ `committed_lsn ≥ lsn ≥` nothing pending below it + +## Error Handling + +### Error Strategy +- Request-shaped commit failure → `-ETIMEDOUT`/`-XCE_ERR_NOT_READY` propagated via existing `errnox` early-return pattern to the client reply; no in-memory rollback (provisional model; outcome converges per 2.5) +- Admission-cap rejection and own-term-pending rejection both surface `-XCE_ERR_NOT_READY` (retriable; distinct log messages) +- Quorum loss: dispatch gate rejects request-shaped ops; fact-shaped ops are still appended and retained (2.8); WARN on transition only (no log storms) +- Demotion/restart: WARN with truncation range before restart; restart failures (exec error) FATAL — the node must not continue as a divergent primary + +### Monitoring +- Log counters: retained-uncommitted entries (fact backlog depth), inflight WAIT count vs cap, commit latency of the promotion no-op. Metrics export is out of scope (downstream). + +## Testing Strategy + +### Unit Tests (testsuite/, XCE_TESTING) +- `test_commit_engine.c`: per-LSN majority (entry N not committed by ACKs for M1 (4.4); membership change re-evaluation (4.3) +- `test_ha_role_lifecycle.c`: ELECTING→PRIMARY direct (no COMMITTING observable); noop appended at promotion; `ha_should_redirect`/`ha_is_primary` semantics (1.3, 1.4); no committing watchdog armed (1.5/3.3) +- Quorum accounting: catch-up standby excluded from `ha_has_write_quorum` (4.1) +- Idempotency guards: duplicate FINISH no-op; DONE→RUN rejected +- `test_egress_filter.c`: job with `submit_lsn > committed_lsn` absent from scheduler collect; present after commit + +### Integration Tests (testsuite/) +- Fact retention: simulate quorum loss → worker-fact WAL types still append (RETAIN), no error, committed after standby ACKs resume (2.8, 7.4) +- Request rejection: job submit and queue ctrl fail with error when majority ACK withheld past timeout; `committed_lsn` unmoved (2.2, 2.3) +- Config barrier: upgradeConfig fails to requester on withheld ACKs; `committed_config_tag` unmoved (5.1–5.3) +- Demotion seam: PRIMARY sees higher term → truncation above `committed_lsn` + restart hook invoked; replay after seam yields committed-only state (2.5, 2.7) +- ACK-driven catch-up: lagging standby receives successive batches without intervening heartbeats (6.2); re-inclusion at parity (6.4) + +### E2E (live cluster, extends ha-wal-replication task 5.4) +- 3-node: submit jobs → kill primary → promoted standby owns all confirmed jobs and none of the unconfirmed ones; demoted node rejoins converged (single-outcome check, 2.5) +- 3-node: isolate primary from both standbys → submits fail, status still served (7.1, 7.3); heal → submits succeed without intervention (7.4) + +## Performance & Scalability +- Commit latency target: unchanged from ha-wal-replication baseline (majority RTT + standby fsync); the no-op adds one entry per election +- Throughput under degradation bounded by admission cap — write rejection is deliberate (CP) and `n_vcpus`-relative; sizing guidance deferred to operator docs (research item 3(e)) + +## Migration Strategy +Phased landing matching the brief's hard ordering (barrier before state removal): +1. Commit engine + per-LSN evaluation behind existing job-submit path (behavioral fix only) +2. Classification rollout: queue/worker/job-control → WAIT; facts → RETAIN; config barrier error propagation +3. Promotion no-op + own-term gate; then delete COMMITTING (+ watchdog, convergence checker); redirect fix +4. Demotion truncate+restart, rejoin reconciliation, egress filter, ACK-driven catch-up, observability +Rollback trigger per phase: controller testsuite regression or live-cluster E2E failure; each phase leaves the system no less consistent than before it. diff --git a/.kiro/specs/ha-consistency-invariants/requirements.md b/.kiro/specs/ha-consistency-invariants/requirements.md new file mode 100644 index 0000000..9e83d31 --- /dev/null +++ b/.kiro/specs/ha-consistency-invariants/requirements.md @@ -0,0 +1,99 @@ +# Requirements Document + +## Project Description (Input) + +XCE HA adopts Raft as the consensus model and CP as the CAP stance (decision 2026-06-10, supersedes the earlier "No Raft" steering entry; single-writer log retained as XCE's simplification). Operators of multi-node XCE controller clusters currently get inconsistent durability guarantees: only WAL_JOB_SUBMIT has a majority-ACK commit barrier, while job state changes, queue control, worker control, and config push apply locally and replicate fire-and-forget; a newly elected primary force-promotes after a 60s timeout even with zero converged standbys; and quorum accounting has gate-only (TOCTOU) and catch-up-counting holes. This feature enforces the consistency invariants deduced from Raft + CP across the controller: (1) remove the CTRL_PRIMARY_COMMITTING state — election winners become CTRL_PRIMARY directly, with post-election write safety provided by the own-term commit rule (Raft §5.4.2) instead of a transitional state; (2) make majority ACK the hard commit barrier for ALL cluster-state-changing operations — reject with an error on timeout or quorum loss, never apply-and-degrade, with committed_lsn/committed_config_tag behaving as Raft commitIndex and state-machine apply only after commit; (3) keep full-consistency replication as best-effort — fan out to all standbys with leader-driven continuous catch-up streaming, majority being only the commit threshold. The universal commit barrier must be implemented before the COMMITTING state is removed. Full audit findings, file:line references, scope boundaries, and the Raft-rule mapping table are in brief.md; the Raft paper is the requirements authority and deviations must be documented with justification. + +## Introduction + +The XCE controller cluster shall provide a uniform consistency contract governed by Raft consensus semantics with CP (consistency over availability) behavior. A cluster-state-changing operation is any operation that alters cluster state observable by clients or surviving a failover: job submission, job state transitions, queue control, worker membership changes, and configuration changes. The contract is: an operation is confirmed to its requester only after its log entry is durable on a majority of cluster members; an operation that cannot reach majority is reported as failed, never silently applied; and replication continuously targets all members, with majority as the commit threshold rather than the distribution target. Leadership is a single role — there is no transitional leader state with weaker guarantees. In-memory state is a provisional materialized view of the log: the persisted, majority-committed log (plus snapshots) is the authoritative cluster state, in-memory state must always be reconstructible from it, and anything externally consequential — confirmations to requesters and exports that drive external actions — is gated on commit, not on the in-memory view. The Raft paper (§5.3 commit rule, §5.4.2 own-term commit rule, Log Matching property) is the authority for these requirements; any deviation must be documented and justified in design. + +## Boundary Context + +- **In scope**: Commit/confirmation semantics for all cluster-state-changing operations on the primary; leadership role unification (no transitional leader state); quorum accounting for accept and commit decisions; quorum-loss and standalone-mode behavior; leader-driven catch-up of lagging standbys. +- **Out of scope**: Vote and election correctness (owned by raft-library); replication wire format and standby-side apply mechanics (owned by ha-wal-replication); read consistency and leader leases (future work — reads may be stale during partition, and status queries may observe provisional in-memory state that is not yet committed; this is a documented deviation, while irrevocable-action exports remain commit-gated per criterion 2.4); automatic primary step-down on quorum loss (blocking writes satisfies CP; step-down is a possible follow-on); checkpoint replication (checkpoints are per-node by design, as Raft snapshots are); worker/scheduler reconnection after failover (worker-join-refactor). +- **Adjacent expectations**: This feature relies on the replication acknowledgment machinery introduced by ha-wal-replication and the heartbeat cadence defined by ha-heartbeat-liveness. Retained reported facts (criterion 2.8) cover facts the primary has received; facts lost before reaching the controller — or lost with the controller across a failover — are recovered by worker re-synchronization at rejoin (worker-rejoin-resync, future spec on the roadmap), which this feature does not own but is the designated backstop. The HA steering document (`ha-async-io.md`) describes the current two-tier model including the transitional leader state and must be synchronized after implementation. + +## Requirements + +### Requirement 1: Unified Primary Role + +**Objective:** As a cluster operator, I want an election winner to act as primary immediately under a single leader role, so that clients are never redirected to a primary that does not exist and the cluster has no transitional mode with weaker consistency guarantees. + +#### Acceptance Criteria + +1. When a controller wins an election, the controller shall assume the primary role directly, without entering an intermediate transitional leader role. +2. The controller shall represent leadership as a single primary role; it shall not define a leader sub-state that accepts a different set of operations than the primary role. +3. While a controller is primary, when a client request requiring the primary arrives, the controller shall process the request subject to the commit barrier (Requirements 2 and 3) rather than redirecting the client to another node. +4. While a controller is primary, the controller shall report itself as the primary in status queries, regardless of whether it has yet committed an entry in its current term. +5. The controller shall not assume or change leadership based on a fixed wall-clock timeout that bypasses majority acknowledgment. + +### Requirement 2: Majority Commit Barrier for State-Changing Operations + +**Objective:** As a cluster operator, I want every cluster-state-changing operation to be durable on a majority of members before it is confirmed, so that no single node failure or failover can lose an acknowledged change. + +#### Acceptance Criteria + +1. When the primary receives a cluster-state-changing operation (job submission, job state transition, queue control, or worker membership change), the primary shall confirm the operation to its requester only after the corresponding log entry has been acknowledged by a majority of cluster members, counting itself. +2. When a state-changing operation has a requester awaiting confirmation (such as a job submission or queue control request) and majority acknowledgment is not obtained within the configured commit timeout, the primary shall report the operation as failed to that requester. +3. If an operation has not achieved majority acknowledgment, the primary shall not advance its commit index past that operation's entry. +4. While a state-changing operation's log entry is not yet committed, the primary shall treat the resulting in-memory state as provisional: the primary shall not confirm the operation to its requester and shall not export the provisional state to consumers whose resulting actions cannot be revoked (such as scheduling and dispatch decisions). +5. If an operation was reported as failed due to commit timeout, the cluster shall converge on a single outcome for its log entry — committed on all members or discarded on all members — the primary shall never retroactively report that operation as successful to the original requester, and each member's in-memory state shall converge to that same outcome. +6. The controller shall advance its commit index monotonically; the commit index shall never decrease. +7. The controller shall be able to reconstruct its in-memory state from its persisted committed state (snapshot plus committed log entries), discarding any provisional state not present in the committed log. +8. When the primary receives a reported fact with no requester awaiting confirmation (such as a worker-reported job state transition), the primary shall retain the fact and continue attempting commitment — including across quorum-loss periods — until the fact's log entry is committed; while the primary remains running and holds leadership, it shall not discard an uncommitted reported fact. + +### Requirement 3: Post-Election Write Safety + +**Objective:** As a cluster operator, I want a newly elected primary to confirm operations only after an entry of its own term is committed, so that a leadership change never exposes uncommitted or divergent state from prior terms. + +#### Acceptance Criteria + +1. When a controller becomes primary, the primary shall not confirm any cluster-state-changing operation until at least one log entry created in its current term has been acknowledged by a majority of cluster members. +2. While the own-term commit condition of criterion 3.1 is unmet, if a state-changing request arrives, the primary shall either process it through the commit barrier (its entry satisfying criterion 3.1 upon majority acknowledgment) or reject it with an error indicating the cluster is not yet ready, and shall not confirm it by any other path. +3. While the own-term commit condition of criterion 3.1 is unmet, the primary shall not be subject to any timeout that confirms operations or advances the commit index without majority acknowledgment. + +### Requirement 4: Quorum Accounting Integrity + +**Objective:** As a cluster operator, I want accept and commit decisions based on members that can actually receive and acknowledge entries, so that a write is never admitted or confirmed against a quorum that does not exist. + +#### Acceptance Criteria + +1. When the primary evaluates whether to accept a state-changing operation, it shall count toward quorum only cluster members currently able to receive new log entries; members that are disconnected or undergoing catch-up shall not be counted. +2. When the primary determines that an entry is committed, it shall require actual acknowledgments from a majority of cluster members; connectivity observed at acceptance time shall not substitute for acknowledgment. +3. If the set of reachable members shrinks below a majority after an operation is accepted but before majority acknowledgment is obtained, the primary shall report the operation as failed rather than confirm it. +4. While the cluster is configured with more than one member, the primary shall never treat zero peer acknowledgments as constituting a majority. + +### Requirement 5: Configuration Change Commit Barrier + +**Objective:** As a cluster operator, I want configuration changes to follow the same majority-commit contract as other state changes, so that a failover never reverts a configuration upgrade that was reported as successful. + +#### Acceptance Criteria + +1. When the primary distributes a configuration change, the primary shall confirm the change to its requester only after a majority of cluster members have acknowledged it. +2. If majority acknowledgment for a configuration change is not obtained within the configured commit timeout, the primary shall report the configuration change as failed to its requester. +3. If a configuration change has not achieved majority acknowledgment, the primary shall not mark that configuration as committed. + +### Requirement 6: Full Replication and Leader-Driven Catch-Up + +**Objective:** As a cluster operator, I want the primary to continuously bring all standbys current, so that the cluster trends toward full consistency and any standby can win a future election without losing committed state. + +#### Acceptance Criteria + +1. While holding leadership, the primary shall replicate new entries to all reachable standbys, not only to a majority subset. +2. When a standby falls behind the live replication stream, the primary shall stream the missing entries to that standby continuously, without requiring a heartbeat exchange to drive each replication step. +3. If a standby is behind the oldest retained log entry, the primary shall bring it current by transferring a snapshot followed by subsequent log entries. +4. When a lagging standby catches up to the primary's commit index, the primary shall re-include it in live replication. +5. While one or more standbys lag, the primary shall continue to confirm operations that achieve majority acknowledgment; full replication is best-effort and shall not become a confirmation precondition. + +### Requirement 7: Quorum Loss and Standalone Behavior + +**Objective:** As a cluster operator, I want a primary that cannot reach majority to refuse state changes with a clear error and recover automatically, so that a partitioned cluster never diverges and no manual intervention is needed after the partition heals. + +#### Acceptance Criteria + +1. While the primary cannot reach a majority of cluster members, the primary shall reject cluster-state-changing operations with an error indicating that the cluster cannot currently commit. +2. When quorum loss occurs, the controller shall record the condition in its log so that operators can observe entry into and exit from the degraded state. +3. While quorum is lost, the primary shall continue to respond to status queries and replication-related traffic from returning members. +4. When majority connectivity is restored, the primary shall resume accepting state-changing operations without operator intervention. +5. While the cluster is configured with a single member, the controller shall treat its own acknowledgment as majority and confirm operations locally, preserving existing standalone behavior. diff --git a/.kiro/specs/ha-consistency-invariants/research.md b/.kiro/specs/ha-consistency-invariants/research.md new file mode 100644 index 0000000..0ad36a4 --- /dev/null +++ b/.kiro/specs/ha-consistency-invariants/research.md @@ -0,0 +1,168 @@ +# Gap Analysis: ha-consistency-invariants + +Date: 2026-06-10. Sources: discovery audit (brief.md), code-explorer verification pass (persist.c, repl.c, ha.c, job.c, cluster.c, config_repl.c, ha-wal-replication tasks.md). + +## 1. Current State Investigation + +### Existing assets directly reusable + +| Asset | Location | Relevance | +|---|---|---| +| Per-standby acked LSN (≈ Raft matchIndex) | `standby_conn_t.acked_lsn` (repl.h), updated by `repl_on_ack` (repl.c:187) | Already exists — the bookkeeping needed for honest per-entry commit verification is in place, just unused by the wait logic | +| Per-standby join/applied LSN (≈ nextIndex) | `standby_conn_t.join_applied_lsn` | Catch-up positioning | +| Sync commit barrier (job submit only) | `persist_wal_sync_append` + `repl_wait_majority_ack` (persist.c:1003-1049, repl.c:386-461) | The pattern to generalize; pthread condvar wait (`ack_cond`) signaled by `repl_on_ack` | +| Full fan-out broadcast | `repl_broadcast` (repl.c:210-282) | Req 6.1 already satisfied | +| WAL streaming catch-up + snapshot fallback | `ha_stream_wal_to_standby` (config_repl.c:1450+), snapshot transfer | Req 6.3 satisfied; drive mechanism needs change for 6.2 | +| Hook-based persistence dispatch | `persist_job_hook_fun` / `persist_queue_hook_fun` / `persist_worker_hook_fun` (persist.c:1107/1199/1241) on HOOK_AFTER_EVENT | The single seam through which all state-changing writes flow | +| Quorum gate at dispatch | `ha_has_write_quorum` + `ha_dispatch_gate` (ha.c:1507-1612) | Req 7.1 partially satisfied (gate-time only) | +| ha-wal-replication ACK machinery | tasks 1.1–5.5 complete; only 5.4 (live 3-node integration test) pending | Upstream dependency effectively satisfied for design | + +### Verified behaviors (with evidence) + +1. **Apply-before-commit is universal — including job submit.** `job_submit()` (job.c:518) inserts the job into the in-memory table, THEN `xce_run_hooks(HOOK_AFTER_EVENT)` (job.c:553) fires the WAL write + majority wait. For state transitions, `mark_job_start/finish/...` mutate `job->job.state` between HOOK_BEFORE_EVENT and HOOK_AFTER_EVENT (e.g., job.c:585-604). Queue and worker state likewise mutate before their hooks fire. On every path, in-memory state precedes the log entry; what differs is only whether the *reply* waits (job submit: yes; everything else: no). Req 2.4 (apply only after commit) is violated everywhere today. +2. **Majority-ACK verification is not per-entry.** `repl_wait_majority_ack` (repl.c:408-443) counts standbys with `acked_lsn > 0` — i.e., "ACKed anything, ever" — not `acked_lsn >= this_entry_lsn`. Once a standby ACKs once, it counts toward every subsequent quorum until disconnect. Concurrent sync appends share one global `ack_cond` and would cross-satisfy each other. Req 4.2 needs per-LSN comparison; the `acked_lsn` field already supports it. +3. **Threading is permissive but finite.** _(Corrected 2026-06-11; original pass understated the pool and overstated the risk.)_ The sync wait is `pthread_cond_timedwait` on a vtask pool thread — default **8** threads, `--vcpus` CLI override (cluster.c:1082). Job submit already blocks one. Generalizing to all write types multiplies concurrent blocked workers; 8 simultaneous slow commits would stall the vtask pool. This is a **throughput risk, not a liveness risk**: WAL ACKs are decoded and waiters signaled on the iomgr thread (`peer_ctrl_msg_handler` → `repl_on_ack`, ha.c:2770-2792), so a fully blocked pool still receives its wakeups — requests queue until a commit completes or times out, but no deadlock is possible. Steering allows vtask handlers to block briefly ("return quickly"; the iomgr never-block rule doesn't apply). Mitigation inputs in Research Needed item 3 (commit-wait admission cap; async continuation as the durable fix). +4. **Job state transitions are reported facts, not requests.** `on_job_start/finish/fail` arrive via worker notifications (`do_notify`, cluster.c:118-156) with no client awaiting a reply. "Rejecting" a job-finish on commit timeout cannot un-finish the job on the worker; the entry must instead be held/retried until commit. The rejection semantics in Req 2.2 map cleanly to request-shaped operations (submit, queue ctrl, config) but need a hold-and-retry interpretation for notification-shaped facts. +5. **COMMITTING removal is concretely mapped.** `raft_cb_become_leader` (ha.c:505) sets COMMITTING; removal means: set CTRL_PRIMARY directly, move hook registration from `ha_promote_to_primary` (ha.c:1691-1698) into the become-leader path, delete the committing watchdog (ha.c:593-616, 3082-3125), make `ha_check_majority_convergence` (ha.c:1313) and `repl_ack_count`/`ha_repl_ack_received` obsolete, adjust the COMMITTING guard in the FSM path (ha.c:2967) and the dispatch-gate COMMITTING branch (ha.c:1594-1612). +6. **Catch-up is heartbeat-polled.** `ha_stream_wal_to_standby` sends all batches `[standby_lsn+1, committed_lsn]` in one call without per-batch ACK waits, but the NEXT round is only triggered by the next heartbeat reply (3s cadence) carrying an updated `applied_lsn` (ha.c:2734 → 1467). Req 6.2 needs ACK-driven (or WAL-append-driven) continuation. + +## 2. Requirement-to-Asset Map + +| Req | Existing asset | Gap | Tag | +|---|---|---|---| +| 1.1-1.2 (direct PRIMARY, single role) | become_leader callback | Remove COMMITTING state + watchdog; move hook registration | Missing (mapped) | +| 1.3 (no redirect from primary) | `ha_should_redirect` (ha.c:1655) | Returns redirect in COMMITTING; resolved by state removal | Missing | +| 1.5 / 3.3 (no timeout bypassing majority) | — | `committing_timeout_fn` force-promote must be deleted | Missing | +| 2.1 (majority barrier all ops) | sync path for WAL_JOB_SUBMIT | Generalize to JOB_* transitions, QUEUE_CTRL, WORKER_CTRL (persist.c:1169/1199/1241) | Missing | +| 2.2 (reject on timeout) | job submit error propagation (job.c:563-570) | Worker notify is pure fire-and-forget (no reply read, no retry, no rejoin resync) — controller MUST own durability via a pending-facts queue; rejection = permanent loss (already true today). See deep-dive §A | Missing (resolved — constraint identified) | +| 2.4 (provisional state, commit-gated egress) | Memory already rebuilt from checkpoint+WAL on restart (persist_recover); role-agnostic replay fns | DECIDED (2026-06-10): provisional-state model — mutation order unchanged; gate requester confirmation + irrevocable-action egress (dataex/scheduler export filters provisional entities by commit status); makes §C reconciliation mandatory core. See deep-dive §B | Missing (decided — egress gating + tagging) | +| 2.5 (single outcome for timed-out entries) | WAL truncation on promotion (ha.c:471) + on standby RDHUP (ha.c:3419); safe_committed_lsn majority-median derivation (ha.c:373-432) | FIVE convergence gaps: no truncation on demotion, no in-memory phantom reconciliation, snapshot is LSN-sentinel only (no entity state), committed_lsn not persisted (restart replays uncommitted suffix), no conflict detection in apply. See deep-dive §C | Missing (resolved — 5 gaps enumerated) | +| 3.1-3.2 (own-term commit) | — | No own-term tracking on promotion; no-op entry vs first-write decision | Missing | +| 4.1 (count only reachable) | `ha_has_write_quorum` (ha.c:1507) | Excludes neither catch-up nor per-write reachability | Missing | +| 4.2-4.4 (ACK-time per-entry verification) | `acked_lsn` per standby | Wait logic compares `> 0` not `>= entry_lsn`; no per-entry wait slots | Missing | +| 5.1-5.3 (config barrier) | `push_config_to_standbys` + `repl_wait_majority_ack` variant (config_repl.c:916-928) | Return code ignored by caller (config_repl.c:1057); error propagation | Missing (small) | +| 6.1 (full fan-out) | `repl_broadcast` | None | Done | +| 6.2 (leader-driven catch-up) | `ha_stream_wal_to_standby` | Continuation is heartbeat-polled, not ACK-driven | Missing | +| 6.3-6.4 (snapshot fallback, re-include) | snapshot transfer, `repl_complete_catchup` | None | Done | +| 6.5 (lag doesn't block confirmation) | majority threshold | Preserved by design | Done | +| 7.1 (reject on quorum loss) | dispatch gate | Gate-time only; ACK-time enforcement closes the TOCTOU | Partial | +| 7.2 (log quorum transitions) | — | Add observability logging | Missing (small) | +| 7.4 (auto-resume) | gate re-evaluates per request | None expected | Done (verify) | +| 7.5 (standalone self-quorum) | `n_peers <= 1` paths | Preserve unchanged | Constraint | + +## 3. Implementation Approach Options + +### Option A: Extend in place +Generalize `persist_wal_sync_append` to all WAL types at the existing hook sites; fix `repl_wait_majority_ack` to per-LSN comparison; delete COMMITTING inline. +- ✅ Smallest diff; all infrastructure exists; follows proven job-submit pattern. +- ❌ Blocking-condvar-per-write multiplies vtask pool throughput-starvation risk (no deadlock — ACKs arrive via iomgr; see §1 item 3); concurrent sync writes still share one condvar (broadcast wakeups checking per-LSN predicates works but is crude); apply-after-commit ordering not addressed (would be documented deviation). + +### Option B: New commit-barrier module +New `commit.c` owning Raft commitIndex logic: per-entry waiter registry (LSN → waiter list), matchIndex aggregation (`acked_lsn` scan on each ACK → advance committed_lsn → wake waiters at or below), explicit pending-entry queue for notification-shaped facts, hold/retry. Hooks call into it; repl.c feeds it ACKs. +- ✅ Clean Raft semantics (commitIndex = median of matchIndex); supports many in-flight entries; single place to test invariants; natural home for own-term tracking and apply-after-commit sequencing. +- ❌ Larger surface; new module must integrate with persist lock ordering and the fsync thread; more migration risk in one step. + +### Option C: Hybrid, phased (barrier-first ordering preserved) +- Phase 1 (repl.c surgical): per-LSN wait predicate (`acked_lsn >= entry_lsn` count ≥ majority), remove `n_active == 0` short-circuit for `n_peers > 1`, ACK-time quorum verification. Job submit immediately gets honest commits. +- Phase 2 (persist.c + small commit registry): generalize the barrier to QUEUE_CTRL, WORKER_CTRL, and request-shaped job ops; introduce a minimal pending-entry registry only for notification-shaped facts (hold/retry until committed); config push error propagation. +- Phase 3 (ha.c): own-term commit gate on promotion, then delete COMMITTING (+ watchdog, convergence checker, redirect fix). +- Phase 4 (config_repl.c): ACK-driven catch-up continuation; quorum-transition logging. +- ✅ Each phase independently testable and shippable; respects the brief's hard ordering (barrier before state removal); risk contained. +- ❌ Per-entry waiter logic lands in two steps; requires discipline to not stop halfway. + +## 4. Effort & Risk + +| Workstream | Effort | Risk | Justification | +|---|---|---|---| +| Per-LSN ACK verification + TOCTOU closure | S-M | Low | Fields exist; localized to repl.c wait/ack path | +| Barrier generalization (request-shaped ops) | M | Medium | Proven pattern, but vtask pool throughput stall needs mitigation (commit-wait admission cap or async continuation — see Research Needed item 3) | +| Notification-shaped facts (pending-facts queue) | M | Medium | Resolved: worker provides NO redelivery (verified), so a primary-side pending queue is the required mechanism; semantics now clear, implementation moderate | +| Provisional-state egress gating (replaces inversion) | M | Medium | DECIDED: mutation order unchanged; tag entities with WAL LSN, filter dataex/scheduler export to committed-only (closes dispatch-of-uncommitted race); smaller than inversion but couples to §C reconciliation being real | +| Demotion/restart convergence (Req 2.5 gaps) | M-L | **High** | NEW workstream: truncate-on-demotion, persist or reconcile committed_lsn at recovery, phantom in-memory state eviction (no teardown path exists; snapshot carries no entity state) | +| COMMITTING removal + own-term gate | S-M | Medium | Concretely mapped (6 sites); must land after barrier | +| Config push error propagation | S | Low | Two call sites | +| Leader-driven catch-up | M | Medium | Continuation trigger redesign in streaming path | + +Overall: **L–XL (2+ weeks across phases), Medium-High risk** — dominated by the two High-risk research items. + +## 5. Recommendations for Design Phase + +**Preferred approach: Option C** (phased hybrid), with Phase 2's pending-entry registry designed Raft-shaped from the start (commitIndex from matchIndex aggregation) so it can absorb Phase 1's logic rather than duplicate it. + +**Research Needed (carry into design):** +1. ~~Apply-after-commit strategy~~ **DECIDED** (user, 2026-06-10): provisional-state model — in-memory state is a provisional view, persisted majority-committed log is authoritative. Mutation order unchanged; gate confirmation + irrevocable-action egress on commit. Remaining design details: entity commit-tagging mechanism (per-entity WAL LSN vs per-type watermark), which egress points are "irrevocable" (dataex/scheduler export: yes; status queries: no, documented deviation), and the egress filter's interaction with array jobs sharing one submit entry. + - **Mechanism direction (discussed 2026-06-10, STM evaluation — REFINED same day)**: full STM rejected — transaction duration mismatch (commit point is a majority network ACK; STM transactions can't span syscalls), C ecosystem dead (libitm unmaintained, TSX disabled), single-writer + per-object RTTI locks already cover the concurrency. An ARIES-style undo log was briefly considered, then **dropped after the recovery-oriented reframing (user)**: this is a failover/recovery problem, not a transaction problem. Structural fact: a single-writer leader never truncates its own log while leader (Raft leaders only append), so a provisional entry on a live primary either commits later or the node is demoted — **discard events coincide exactly with role/lifecycle events** (demotion, restart, rejoin), never with normal operation. Therefore: no per-entry undo; discard is handled by recovery mechanisms — truncate divergent suffix + coarse memory rebuild via the existing `persist_recover`/`replay_wal` path at demotion/rejoin (rare, node not serving writes, cost acceptable). The only piece retained from the versioning discussion is the **watermark egress filter** (entity WAL-LSN tag, export only `lsn <= committed_lsn` to dataex/scheduler) — justified as failover correctness (prevent orphan dispatch of a job the post-failover cluster never heard of), not as transaction isolation. + - **xzarray shadow evaluated (2026-06-11)**: the dual-zarray COW (`xzarray_freeze`/`xzarray_thaw`, zarray.c:695-757 — built and unit-tested, zero production callers; kvmgr vfreeze NULL "wired in P0-2") is slot-level STRUCTURAL COW: slots hold pointers, so in-place field mutations (job state transitions) are visible through both views. Not suitable for the committed-view egress (reads are merged active-over-shadow, single generation would collide with the future checkpoint consumer, point-in-time vs advancing watermark) nor for provisional rollback (only covers inserts, not mutations; demotion-time eviction doesn't need lock-free semantics anyway). Its real home is the entity-bearing-snapshots backlog item (its original P0-2 purpose), which indirectly strengthens §C eviction option (iii). Watermark filter stands as the egress mechanism. +2. ~~Notification-shaped facts~~ **DECIDED** (user, 2026-06-11): **log-is-the-queue, Raft-pure** — fact entries are appended to the WAL immediately and replicated/retried until committed with NO commit timeout (Raft leaders never time out entries; retry across quorum-loss periods per Req 2.8). No separate side-queue structure; the "pending facts" are simply the uncommitted log suffix under continuous retry. Crash-loss of uncommitted facts is accepted until worker-rejoin-resync (roadmap backstop) lands — strictly better than today's behavior. Remaining design details: idempotency guards in `mark_job_*` (needed for replay safety) and retry/backoff cadence. +3. **Wait mechanism under load**: blocking condvar per vtask worker vs async continuation (queue reply closure, complete on commit). Measure vtask pool headroom; consider dedicated commit-wait sizing. + - **Verified inputs (2026-06-11)**: (a) vtask pool default is ALREADY 8 with `--vcpus` override (cluster.c:1082; the "default 4" in ha-async-io.md was stale — fixed). (b) **No wakeup deadlock**: WAL ACKs are processed on the iomgr thread (`peer_ctrl_msg_handler` → `repl_ack_decode_and_dispatch` → `repl_on_ack`, ha.c:2770-2792, 2748) — blocked vtask workers always get woken; all-workers-blocked costs throughput, not liveness. (c) **Pool size should NOT scale with n_peers** (user question, analyzed): blocked-thread count ≈ in-flight write ops × commit latency (Little's law); ACKs gather in parallel so peer count barely moves latency. Write concurrency and cores are the sizing inputs. (d) Recommended interim mitigation: commit-wait admission cap — at most `n_vcpus - K` concurrent blocking waits (reserve K lanes for non-blocking traffic), excess write ops fail fast with NOT_READY (CP-correct under overload). Async continuation remains the durable fix. (e) **Sizing ownership (user, 2026-06-11)**: `--vcpus` is a tunable operator parameter — the right value is a deployment decision driven by host capability, cluster size, and workload; 8 is only the fallback default. Design constraint: all commit-wait correctness mechanisms must be expressed relative to `n_vcpus` (never absolute counts) so behavior is correct at any tuning; sizing guidance belongs in operator/tuning docs, not in spec-fixed constants. +4. ~~Own-term commit vehicle~~ **DECIDED** (user, 2026-06-11): **explicit no-op WAL entry at promotion** — bounded post-election write-unavailability independent of traffic; an idle cluster's new primary becomes writable as soon as the no-op commits. +5. **Multi-entry in-flight semantics**: confirm `committed_lsn` advancement is contiguous (no gaps) when multiple entries await ACKs. +6. ~~Req 2.5 verification~~ **RESOLVED into a workstream** (deep-dive §C): five convergence gaps enumerated. Design must choose the phantom-eviction strategy: (i) full in-memory rebuild on demotion (needs new teardown path for jobmgr/queues/workers, then `replay_wal` from checkpoint after truncation), (ii) process self-restart on demotion (crude, safe, CP-consistent), or (iii) entity-bearing snapshots (depends on the deferred "Task 11" snapshot format). Also: persist `committed_lsn` (or reconcile it from the cluster at recovery) so restart does not replay the uncommitted suffix. + +**Constraints to respect:** standalone `n_peers <= 1` self-quorum unchanged; iomgr thread never blocks (waits live on vtask/delaymgr threads only); single-writer model; ha-wal-replication task 5.4 (live integration test) still pending — its 3-node test should be extended to cover the new barrier rather than duplicated. + +--- + +# Design Synthesis Outcomes (2026-06-11, design phase) + +- **Generalization**: Requirements 2.x (op barrier), 3.x (own-term gate), and the per-LSN quorum fixes (4.2–4.4) are one capability — a single **commit engine** (`commit.c`) with two completion modes: WAIT (request-shaped, blocking with timeout + admission cap) and RETAIN (fact-shaped, log-is-the-queue, no timeout). Config (5.x) stays a parallel simpler track (one in-flight change, own tag) sharing the majority arithmetic helper. +- **Build vs adopt**: algorithm adopted from the Raft paper (§5.3 commit rule, §5.4.2 own-term no-op); machinery reuses existing assets — `standby_conn_t.acked_lsn` (matchIndex), `repl_broadcast`, catch-up streaming, `persist_recover` boot path (reused by demotion self-restart). No new libraries; no .capnp changes (WAL_NOOP is a controller-internal entry type). +- **Simplification** (locked by user decisions): no undo log, no MVCC/committed-view machinery, no side pending-facts queue (the uncommitted log suffix IS the queue), no persisted commitIndex (volatile per Raft; rejoin reconciliation instead), egress filter = one watermark comparison on `submit_lsn`, demotion eviction = truncate + process self-restart via the existing boot path. +- Design written to `design.md`; review gate passed (all 33 requirement IDs traced, no orphan components, boundary↔file alignment verified). + +--- + +# Deep-Dive Research: Requirements 2.2, 2.4, 2.5 (2026-06-10, second pass) + +Three parallel code-explorer passes resolving the Unknown tags. All findings verified with file:line evidence. + +## §A — Req 2.2: Notification-shaped facts have NO redelivery anywhere (worker → controller) + +**Verdict: the controller must own durability of worker-reported job state facts. A pending-facts queue on the primary is the only option that doesn't expand scope into the worker protocol.** + +**DECIDED (user, 2026-06-11)**: facts are retained and retried until committed — including across quorum-loss periods; the primary never discards an uncommitted fact while running and leading (Req 2.8). Worker-rejoin re-sync (roadmap backlog) is the designated backstop for facts that never reached the controller or were lost with it across failover. + +- **Send path is enqueue-and-forget**: worker job start/finish/fail → `xcecli_notify_*` (src/lib/client.c:289/373/392) → `xce_notify` (xceapi.c:270) → `xce_request` which enqueues and returns 0 immediately (request.c:309-331). No `cbuf_get` anywhere in the chain — the worker never reads a reply. +- **Errors are silently discarded twice**: (1) the return value of `xcecd_job_finished` is ignored at its call sites (xcecd_worker_utils.c:297-337, with a literal `/* FIXME: add error handling when msg send failure */`); (2) if the controller's dispatch gate rejects the notify with `-XCE_ERR_NOT_READY` (cluster.c:252-258), the error reply reaches the worker but is dropped by `cbuf_tryput` returning -EAGAIN with no consumer (xcectx.c:82-88, 304). +- **No resync on rejoin**: the worker rejoin path (`checking_connection`, controller_connector.c:176) re-issues only hello + join; `xce_join_req` carries only host resource attributes (request.c:1154-1181), no running-job state. Notifications lost during disconnect/failover are never re-delivered. +- **Controller side is also fire-and-forget**: `do_notify` (cluster.c:118-157) sends no reply at all once the gate passes. +- **No idempotency guards**: `mark_job_start/finish/fail` (job.c:583/638/696) unconditionally overwrite `job->job.state` — duplicate or out-of-order delivery (e.g., from a future retry/replay mechanism) is unguarded. +- **Scheduler-originated transitions differ**: `handle_jobdispatch` (job.c:459) replies synchronously (status 0 at job.c:471) BEFORE processing allocations; dispatch results flow back to the scheduler via `notify_dispatch` (job.c:440). Retry is owned by the scheduler side (none found in scheduler.c at the reviewed path). + +**Pre-existing bug exposed**: today, quorum-loss (or COMMITTING-window) rejection of `OPCode_notify` already loses job state transitions permanently — the worker never learns and never resends. The pending-facts queue fixes an existing silent-data-loss hole, not just a new-requirements need. + +**Design inputs**: queue must persist facts arriving while quorum is absent and drain them (through the commit barrier) when quorum returns; needs bounded size + eviction policy; `mark_job_*` need state-machine guards so queue drain/replay is idempotent and ordered. + +**Companion backlog item (2026-06-10)**: worker-rejoin-resync added to `.kiro/steering/roadmap.md` — long-planned, covers the disconnect/failover window this queue cannot (facts the worker generated while not connected). Out of scope for this spec; the idempotency guards designed here are a shared prerequisite. + +## §B — Req 2.4: Apply-after-commit inversion is FEASIBLE (and fixes an existing race) + +**Verdict (superseded 2026-06-10, user decision): the PROVISIONAL-STATE MODEL is adopted instead of inversion.** In-memory state is a provisional materialized view; the persisted majority-committed log is the authoritative state. Mutation order stays as-is; commit gating moves to (1) requester confirmation and (2) irrevocable-action egress points — the dataex/scheduler export must filter provisional entities (e.g., tag entities with their WAL LSN, export only `lsn <= committed_lsn`), closing the dispatch-of-uncommitted-job race noted below. This makes the §C reconciliation workstream mandatory core (provisional state must actually be discarded when the log disagrees). Requirements 2.4/2.7 amended accordingly. The inversion findings below are retained as evidence and fallback. + +**Original verdict: invert to log→commit→apply. All prerequisites verified; the rollback alternative is infeasible.** + +- **The BEFORE-hook seam exists and is free**: `xce_run_hooks` aborts the chain when a HOOK_BEFORE_EVENT hook returns negative (hook.c:137) — veto semantics are built in. No registered hook currently does anything on BEFORE for job/queue/worker events (sched.c:244, apiserver.c:134, persist.c:1099 all AFTER-only), and callers currently ignore the BEFORE return code — both sides of the seam are unused and available. +- **WAL payloads are constructible pre-mutation**: WAL_JOB_SUBMIT serializes the full `xce_job_t`, but every field is computable before table insertion — the job ID is assigned by the apiserver's `idgen()` before the RPC (idgen.c:22; `submit->jobid` pre-assigned, array jobs are `base_id + i`, job.c:34). State-transition payloads are just `{jobid, new_state}` where new_state is a per-transition constant (persist.c:1134-1169) — trivially known before mutation. +- **Replies don't need post-mutation state**: `handle_jobsubmit`'s reply carries only `jobid` (job.c:575-578), known pre-insertion. +- **Post-commit apply can reuse the replay functions**: the standby/recovery apply path (`apply_wal_entry` → `restore_job`/`restore_job_state`, persist.c:691-769, job.c:71-121) is role-agnostic with an EEXIST idempotency guard (jobj.c:696-699). Caveat: `apply_wal_entry` skips hooks by design (persist.c:686) — primary post-commit apply must either call restore fns directly or suppress hook double-fire (sched/apiserver AFTER hooks still need to run exactly once). +- **Rollback (the alternative) is infeasible**: there is no job deletion path — `job_obj_killer` is a stub (cluster.c:759-764), `key_del` is never called in src/controller/. Undo would be net-new, riskier code than inversion. +- **Inversion fixes an existing race**: today the submitted job is visible in `c->jobmgr` to concurrent vtask readers (dataex/`collect_jobs` snapshots, up to 8 vtask threads, cluster.c:1082) for the entire majority-wait window — no per-job write lock is held during the AFTER hook (job.c:553). An uncommitted job can leak to the scheduler via a racing dataex pull. Apply-after-commit closes this. +- **One trade-off**: state-transition callers hold the per-job WRITE lock across BEFORE/mutate/AFTER (job.c:629-631 etc.). Naively moving the commit wait inside that region blocks readers of that job for up to the commit timeout — design should release/restructure the lock around the wait (the pending-facts queue from §A naturally decouples this). + +## §C — Req 2.5: Convergence currently has FIVE gaps; safe_committed_lsn derivation is sound + +**Verdict: the "single outcome cluster-wide" requirement is NOT met today for the demoted-ex-primary and restart cases. New workstream required.** + +What works: +- New leader truncates above `safe_committed_lsn` on promotion (ha.c:471); standby truncates on RDHUP using `last_known_committed_lsn` (ha.c:3416-3420); `committed_lsn` advances only on majority ACK (persist.c:1035). +- `safe_committed_lsn` = majority-median of granted voters' committed LSNs, sorted descending, index `n_granted/2` (ha.c:373-432) — conservative and safe (never includes an uncommitted entry; may under-estimate and over-truncate, which is correct-but-lossy for uncommitted suffixes). + +The five gaps: +1. **No WAL truncation on demotion**: `raft_cb_become_follower` (ha.c:627-690) cancels timers, closes vote endpoints, sets STANDBY — but never calls `persist_truncate_wal_above`. The ex-primary's divergent uncommitted suffix survives on disk until its own future RDHUP event. (Also: this production path never disables persistence hooks — `ha_demote_to_standby` (ha.c:1712-1724) does, but is not called here.) +2. **No in-memory phantom eviction on demotion**: no path rebuilds or removes in-memory jobs/queues/workers applied from uncommitted entries. Phantoms persist indefinitely on the demoted node. +3. **Snapshots carry no entity state**: the snapshot format is a 16-byte sentinel (magic + checkpoint_lsn, persist.c:435-437, "Task 11" placeholder); `persist_load_snapshot` (persist.c:680-683) only moves the LSN watermark. Snapshot transfer can therefore NEVER evict phantoms — option (iii) below depends on implementing the real format. +4. **Restart resurrects phantoms**: `committed_lsn` is in-memory only (zero-init on boot, never persisted); `replay_wal` (persist.c:781-951) replays everything above `checkpoint_lsn` with no committed_lsn gate. A crashed ex-primary replays its own uncommitted suffix back into memory. +5. **No conflict detection in standby apply**: `apply_wal_entry` advances `current_lsn` and applies unconditionally by type (persist.c:720-721) — entries from the new primary are applied on top of phantom state with no divergence check. + +Eviction strategy options for design: (i) in-memory rebuild on demotion — new teardown for jobmgr/queues/workers, then truncate + `replay_wal` from checkpoint (most work, no restart); (ii) process self-restart on demotion after truncation — minimal code, CP-acceptable since the node is leaving leadership anyway; (iii) entity-bearing snapshot transfer from the new primary — depends on deferred Task 11 snapshot format. **DECIDED (user, 2026-06-11): option (ii) — process self-restart on demotion** (after truncating the divergent suffix). Simplest and battle-tested: recovery reuses the boot path; a demoted node's worker/scheduler connections migrate to the new primary anyway, so the restart's connection reset costs little. Rebuild-in-place (i) remains a future refinement only if restart proves operationally disruptive. For gap 4, note Raft treats commitIndex as VOLATILE (followers recover it from the leader): the Raft-conformant fix is leader-driven log reconciliation at rejoin (consistency check + truncate divergent suffix, then rebuild) rather than persisting `committed_lsn` locally — design should weigh reconciliation-at-rejoin vs local persistence; either must ensure the replayed-but-uncommitted suffix cannot leak through irrevocable egress before reconciliation completes. diff --git a/.kiro/specs/ha-consistency-invariants/spec.json b/.kiro/specs/ha-consistency-invariants/spec.json new file mode 100644 index 0000000..a36b82e --- /dev/null +++ b/.kiro/specs/ha-consistency-invariants/spec.json @@ -0,0 +1,23 @@ +{ + "feature_name": "ha-consistency-invariants", + "created_at": "2026-06-10T21:40:00-07:00", + "updated_at": "2026-06-11T09:30:00-07:00", + "language": "en", + "phase": "design-generated", + "approvals": { + "requirements": { + "generated": true, + "approved": true + }, + "design": { + "generated": true, + "approved": false + }, + "tasks": { + "generated": false, + "approved": false + } + }, + "ready_for_implementation": false, + "note": "UMBRELLA CONTRACT spec (decomposed 2026-06-11): requirements.md/design.md/research.md are the authoritative contract for four implementation sub-specs — ha-commit-engine, ha-commit-barrier-rollout, ha-single-leader-role, ha-convergence-recovery (dependency order in steering/roadmap.md). Do NOT generate tasks for this spec; implement via the sub-specs. Design approved as contract; sub-spec designs inherit and slice it." +} diff --git a/.kiro/specs/ha-convergence-recovery/brief.md b/.kiro/specs/ha-convergence-recovery/brief.md new file mode 100644 index 0000000..0e96fae --- /dev/null +++ b/.kiro/specs/ha-convergence-recovery/brief.md @@ -0,0 +1,24 @@ +# Brief: ha-convergence-recovery + +> Sub-spec 4 of 4 implementing the **ha-consistency-invariants** umbrella contract. +> Authoritative requirements/design/research: `.kiro/specs/ha-consistency-invariants/` (design.md §Demotion Convergence + §Egress Filter + §ACK-Driven Catch-up + §Quorum Observability; research.md §C five convergence gaps). This brief scopes the slice; do not re-derive decisions. + +## Problem +Five verified convergence gaps: a demoted ex-primary never truncates its divergent WAL suffix; phantom provisional in-memory state is never evicted; restart replays the uncommitted suffix (committed_lsn is volatile, correctly per Raft, but nothing reconciles at rejoin); standby apply has no conflict detection; and uncommitted jobs leak to the scheduler via dataex during the commit window (orphan-dispatch risk). + +## Desired Outcome +Cluster-wide single-outcome convergence and commit-gated egress: demotion truncates above `committed_lsn` and self-restarts through the existing boot recovery (provisional state discarded); a rejoining standby whose WAL tip exceeds the primary's committed boundary truncates and restarts once; the scheduler export path never sees a job whose submit entry is uncommitted; catch-up streaming continues on walAck without waiting for heartbeats; quorum-loss transitions are operator-visible in logs. + +## Scope +- **In**: demotion path in `ha.c` (`raft_cb_become_follower` from PRIMARY: disable hooks, truncate above committed_lsn, WARN-log, self-restart; `XCE_TESTING` restart-hook seam); rejoin reconciliation (generalize RDHUP truncation to the rejoin/hello path); `job_t.submit_lsn` + scheduler-export filter in `dataex.c` (status/API queries intentionally unfiltered — documented deviation); ACK-driven catch-up continuation in `config_repl.c` (heartbeat path remains fallback + snapshot initiator); quorum enter/exit WARN logging; verification tests for unchanged behaviors (full fan-out 6.1, snapshot fallback 6.3, re-inclusion 6.4, degraded status service 7.3); 3-node E2E (extends ha-wal-replication task 5.4: confirmed jobs survive failover, unconfirmed jobs converge to absent). +- **Out**: entity-bearing snapshots (roadmap backlog — would later upgrade eviction to option iii); read-consistency filtering of status queries; primary step-down on quorum loss; worker rejoin job-state resync. + +## Requirements (umbrella IDs) +2.4, 2.5, 2.7, 6.1, 6.2, 6.3, 6.4, 7.2, 7.3. + +## Upstream / Downstream +- **Upstream**: ha-commit-engine (committed_lsn semantics). Parallel-safe with specs 2–3 except: full E2E requires ha-single-leader-role landed. +- **Downstream**: entity-bearing snapshots (eviction upgrade path); worker-rejoin-resync (recovers facts across the restart this spec introduces). + +## Constraints +Self-restart must FATAL rather than continue if exec fails (a divergent ex-primary must not keep serving); restart seam mockable under XCE_TESTING; truncation always precedes restart so boot replay yields committed-only state. diff --git a/.kiro/specs/ha-convergence-recovery/design.md b/.kiro/specs/ha-convergence-recovery/design.md new file mode 100644 index 0000000..c533abe --- /dev/null +++ b/.kiro/specs/ha-convergence-recovery/design.md @@ -0,0 +1,425 @@ +# Design: ha-convergence-recovery + +> Sub-spec 4 of 4 of the **ha-consistency-invariants** umbrella. This design slices the umbrella design's **Demotion Convergence**, **Egress Filter**, **ACK-Driven Catch-up**, and **Quorum Observability** components plus the role-lifecycle flow (`.kiro/specs/ha-consistency-invariants/design.md`) — umbrella Migration Strategy phase 4. Discovery is complete via the umbrella's `research.md` (deep-dive §C five convergence gaps; locked decisions) plus this spec's anchor-verification pass (`research.md`, 2026-06-11). Requirement IDs below are THIS spec's IDs (see `requirements.md` for the umbrella mapping). + +## Overview + +**Purpose**: This feature closes the five verified convergence gaps so the cluster converges to a single outcome for every log entry and the scheduler never acts on uncommitted state: a demoted ex-primary truncates its uncommitted WAL suffix and self-restarts through boot recovery; a rejoining node whose log runs ahead of the cluster's committed boundary reconciles by truncation and one restart; scheduler-bound job exports are gated on the commit watermark; catch-up streaming continues on WAL ACK instead of waiting for heartbeats; and quorum-loss/restore transitions are operator-visible. + +**Users**: Cluster operators gain single-outcome failover semantics (no phantom state on demoted/rejoined nodes) and observable degraded periods; the scheduler is protected from orphan dispatch; lagging standbys catch up at ACK speed. + +**Impact**: Extends `raft_cb_become_follower` (ha.c:627-690 — currently neither truncates nor disables hooks, verified gap) with the demotion-convergence sequence; generalizes the RDHUP truncation (ha.c:3416-3420) to the rejoin path; adds `submit_lsn` to the `job_t` wrapper and a watermark predicate on the scheduler export seams; adds an ACK-driven continuation to catch-up streaming (`ha_stream_wal_to_standby`, config_repl.c:1450 — today re-driven only by the next heartbeat reply); adds quorum-transition WARN logging. No commit semantics change: this spec consumes `committed_lsn` (ha-commit-engine) and never modifies `commit.c`. + +### Goals +- Demotion = disable hooks → truncate above `committed_lsn` → WARN-log range → process self-restart via existing boot recovery; exec failure is FATAL; `XCE_TESTING` restart seam (1.1–1.7) +- Rejoin reconciliation: local tip beyond the primary's committed boundary → clamped truncation + one restart (2.1–2.3); single-outcome convergence E2E-verified (2.4) +- Commit-watermark egress filter on scheduler-bound exports only; status/API reads untouched (3.1–3.4) +- ACK-driven catch-up continuation with single-flight guard; heartbeat path stays fallback + snapshot initiator; parity triggers re-inclusion (5.1–5.3, 7.1) +- Quorum-loss/restore transitions WARN-logged once per change (8.1–8.3) +- Regression tests pinning existing full fan-out, snapshot fallback, re-inclusion, degraded-mode service (4.1, 6.1, 7.1, 9.1–9.2) + +### Non-Goals +- Commit-index advancement, majority evaluation, admission cap (ha-commit-engine — upstream, complete) +- WAL-type classification, reply ordering, config barrier (ha-commit-barrier-rollout) +- Promotion no-op, own-term gate consumers, CTRL_PRIMARY_COMMITTING removal (ha-single-leader-role; this spec's E2E depends on it having landed) +- Entity-bearing snapshots (roadmap — would upgrade eviction to in-place rebuild); read-consistency filtering of status queries; primary step-down on quorum loss; worker rejoin job-state resync (roadmap backstop) +- Standby-apply conflict detection beyond the rejoin truncation rule (umbrella gap 5 is subsumed by reconciliation: divergent suffixes are truncated at role/lifecycle events, never patched in place) + +## Boundary Commitments + +### This Spec Owns +- The demotion path of the role lifecycle: everything `raft_cb_become_follower` does when leaving PRIMARY (hook disable, truncation, logging, self-restart) and the self-restart primitive (saved argv, exec, FATAL fallback, test seam) +- Rejoin reconciliation at the standby's `CtrlHelloReply` intake (truncate-above-boundary decision, clamp, once-guard) +- `job_t.submit_lsn` tagging (live append + replay) and the commit-watermark predicate on scheduler-bound export seams +- The ACK-driven catch-up continuation trigger (walAck branch → scheduled streaming) including the single-flight guard and the parity call to `repl_complete_catchup` +- Quorum-loss/restore transition logging and its `quorum_lost` state flag +- Regression tests for umbrella 6.1/6.3/6.4/7.3 and the 3-node convergence E2E (extends ha-wal-replication task 5.4) + +### Out of Boundary +- `commit.c` / `include/commit.h` — read-only consumer of `committed_lsn`; never modified here +- `repl_wait_majority_ack`, write-path classification, reply ordering (ha-commit-barrier-rollout); promotion path of the lifecycle (`raft_cb_become_leader`) and COMMITTING removal (ha-single-leader-role) +- `ha_stream_wal_to_standby` internals and the WAL batch wire format (ha-wal-replication — the continuation calls it, unchanged) +- `persist_truncate_wal_above`, `persist_recover`, `replay_wal` internals — reused as-is +- Status/API read paths (apiserver.c:83, opget.c:173) — intentionally unfiltered (documented deviation) +- Worker/scheduler reconnection behavior after the restart this spec introduces (worker-join-refactor / worker-rejoin-resync) + +### Allowed Dependencies +- `persist_t.committed_lsn` atomic (lock-free reads) — the watermark and truncation boundary; ha-commit-engine owns advancement +- `persist_truncate_wal_above` (persist.c:1306), `persist_recover` boot path — truncation + rebuild primitives +- `ha_stream_wal_to_standby` (config_repl.c:1450) and `repl_start_catchup`/`repl_complete_catchup` (repl.c:507/521) — existing catch-up machinery; `repl_complete_catchup` already feeds `commit_on_membership_change` via ha-commit-engine wiring +- iomgr/vtaskmgr/delaymgr threading rules per `ha-async-io.md`: the walAck branch and `raft_cb_become_follower` may run on iomgr — file I/O (truncation, WAL streaming) and exec are always deferred to delaymgr/vtask tasks +- `xce_disable_hook` / hook registration guard (`hooks_registered`) — existing hook lifecycle +- Established `XCE_TESTING` function-pointer seam pattern (e.g., `ha_repl_stream_wal_hook`, `xce_wal_stream_request_hook`) + +### Revalidation Triggers +- ha-commit-engine changing `committed_lsn` ownership or making it persisted → re-verify rejoin reconciliation and the egress watermark +- ha-commit-barrier-rollout landing (fact allowlist) → re-verify the degraded-mode gate pin: the no-quorum rejected set becomes request-shaped opcodes only; fact-shaped opcodes (`OPCode_notify`/`update`/`setpreason`/`clrpreason`) are admitted +- ha-single-leader-role landing → re-anchor the quorum-transition log call site at promotion standby registration (ha.c:531), which lives inside `raft_cb_become_leader` (ha.c:445-617) — code that spec owns and rewrites wholesale +- ha-single-leader-role changing the become-follower/become-leader callback contract → re-verify the demotion sequence insertion point +- Entity-bearing snapshots landing → re-evaluate restart-based eviction vs snapshot-based rebuild (umbrella revalidation trigger) +- Any new scheduler-bound export path → must adopt the watermark predicate (same rule as new WAL types must be classified) +- worker-rejoin-resync landing → re-verify restart interaction (facts lost across the restart are its recovery target) + +## Architecture + +### Existing Architecture Analysis +- `raft_cb_become_follower` (ha.c:627-690) cancels timers, closes vote endpoints, sets CTRL_STANDBY — verified: no truncation, no hook disable (the disable logic exists only in the uncalled `ha_demote_to_standby`, ha.c:1712-1726) +- The RDHUP failover path already truncates above the locally known committed boundary (ha.c:3416-3420) — the pattern this spec generalizes to demotion and rejoin +- The standby learns the primary's `committed_lsn` at the `CtrlHelloReply` intake (cluster.c:283-298, stored to `ha->last_known_committed_lsn`) — the rejoin-reconciliation evaluation point +- Catch-up is heartbeat-polled: the stateReport branch (ha.c:2734) drives `ha_dispatch_repl_action_for_standby` (ha.c:1373-1478), one action per heartbeat cycle; the walAck branch (ha.c:2737-2754) only records the ACK. Replication target is already derived as `max(committed_lsn, last_written)` (ha.c:2727-2732) +- `repl_complete_catchup` (repl.c:521) has no production caller (discovered gap — in_catch_up is set by broadcast-overflow eviction, repl.c:240, and never cleared); the ACK-driven continuation supplies the missing parity trigger +- Scheduler-bound egress has two seams: collect-based full push (`xcesched_push_jobs` sched.c:169, on scheduler join) and the incremental JOB_NEW push (`sched_job_new_fun` sched.c:236-248 → `xcesched_push_joblist`); both must apply the watermark. Read paths (apiserver.c:83, opget.c:173) share `collect_jobs` (dataex.c:294) and stay unfiltered +- No saved argv / exec machinery exists anywhere in the controller — self-restart is net-new (main.c:112) + +### Architecture Pattern & Boundary Map + +```mermaid +graph TB + subgraph role_lifecycle[role lifecycle - ha.c] + BF[raft_cb_become_follower
from PRIMARY] + DC[demotion convergence task
delaymgr] + SR[ha_self_restart
exec or test seam] + end + subgraph rejoin[rejoin - cluster.c + ha.c] + CHR[CtrlHelloReply intake] + RR[rejoin reconciliation] + end + subgraph persist[persist.c - reused] + TR[persist_truncate_wal_above] + REC[persist_recover boot replay] + end + subgraph egress[egress - dataex.c, sched.c, job.c] + TAG[submit_lsn tagging] + PRED[job_submit_committed predicate] + PUSH[scheduler push paths] + end + subgraph catchup[catch-up - ha.c + config_repl.c] + ACK[walAck branch iomgr] + CONT[continuation task delaymgr] + STREAM[ha_stream_wal_to_standby] + RCC[repl_complete_catchup] + end + QO[quorum observability - ha.c] + CL[(committed_lsn
ha-commit-engine owned)] + + BF --> DC --> TR + DC --> SR + CHR --> RR --> TR + RR --> SR + SR -. process restart .-> REC + TAG --> PRED + CL --> PRED --> PUSH + ACK -->|behind target| CONT --> STREAM + ACK -->|at parity| RCC + CL --> ACK + QO -. WARN once per transition .- CL +``` + +**Architecture Integration** (sliced from umbrella): +- Selected pattern: convergence by recovery, not by transaction — discard events coincide with role/lifecycle events (demotion, rejoin), handled by truncate + boot-recovery rebuild; the only steady-state mechanism is the one-comparison watermark filter (umbrella-locked) +- Existing patterns preserved: RDHUP truncation pattern, heartbeat decision loop (kept as fallback), enqueue-only streaming, `XCE_TESTING` seams, `errnox` early-return style +- New code rationale: each gap closes with the smallest insertion at a verified seam; no new module — all changes live in the files that own the respective seams +- Steering compliance: no file I/O or blocking on iomgr (convergence + continuation run on delaymgr tasks); TDD with testsuite/ tests first + +### Technology Stack + +| Layer | Choice / Version | Role in Feature | Notes | +|-------|------------------|-----------------|-------| +| Backend / Services | C (gnu17), pthreads, stdatomic | demotion/rejoin/egress/catch-up logic | no new dependencies, no .capnp changes | +| Data / Storage | existing WAL + snapshot sentinel (persist.c) | truncation boundary + boot rebuild | `submit_lsn` is in-memory only (recomputed from entry LSN at replay) | +| Process | execv re-exec of saved argv | demotion/rejoin eviction | FATAL on failure; seam under XCE_TESTING | +| Build / Test | meson, testsuite/ pattern | new test files in `controller_unit_test_src` | E2E via `/xce-deploy-ha` | + +## File Structure Plan + +### Directory Structure +``` +src/controller/ +├── ha.c # MODIFIED — demotion convergence sequence, ha_self_restart, rejoin +│ # reconciliation helper, walAck continuation trigger, +│ # quorum transition logging +├── ha.h # MODIFIED — quorum_lost flag, catchup_inflight tracking, restart-hook +│ # seam declaration, new function prototypes +├── main.c # MODIFIED — save argv for re-exec (controller_saved_argv accessor) +├── cluster.c # MODIFIED — CtrlHelloReply intake calls rejoin reconciliation +├── config_repl.c # MODIFIED — catch-up continuation task fn (wraps ha_stream_wal_to_standby) +├── dataex.c # MODIFIED — job_submit_committed predicate + committed-only collect for +│ # scheduler-bound export +├── sched.c # MODIFIED — scheduler push paths consume the predicate (full + JOB_NEW push) +├── job.c # MODIFIED — restore_job tags submit_lsn from the replayed entry +├── persist.c # MODIFIED — persist_job_hook_fun tags submit_lsn at live append; +│ # apply_wal_entry passes entry LSN to restore_job +└── testsuite/ + ├── test_demotion_convergence.c # NEW — demotion + rejoin reconciliation + restart seam + ├── test_egress_filter.c # NEW — watermark filter on scheduler export seams + └── test_convergence_verification.c # NEW — ACK-driven catch-up, quorum logging, and + # regression pins for 6.1/6.3/6.4/7.3 (umbrella) +src/include/xce/types.h # MODIFIED — job_t wrapper gains uint64_t submit_lsn +src/controller/meson.build # MODIFIED — register new test files +``` + +### Modified Files (what and why) +- `ha.c` / `ha.h` — demotion branch in `raft_cb_become_follower` (detect prior role PRIMARY → disable hooks inline → schedule convergence task); `ha_self_restart()` (exec / seam / FATAL); `ha_rejoin_reconcile()` (clamped truncation + once-guard + restart); walAck-branch continuation scheduling with per-standby single-flight guard and parity `repl_complete_catchup` call; `ha_log_quorum_transition()` called from the three standby_endpoints mutation sites (ha.c:531, 3160-3166, on_standby_connected) and the gate rejection backstop +- `main.c` — store argc/argv before parsing; expose `controller_saved_argv()` for re-exec +- `cluster.c` — `CtrlHelloReply` intake (cluster.c:283-298) additionally invokes `ha_rejoin_reconcile(c, chrep->committed_lsn)` +- `config_repl.c` — `ha_catchup_continuation_fn` (delaymgr task body): re-derive target, call `ha_stream_wal_to_standby`, clear the in-flight flag +- `dataex.c` — `job_submit_committed(cluster_t*, job_t*)` predicate; `collect_jobs_committed()` wrapper used only by scheduler-bound callers (read paths keep plain `collect_jobs`) +- `sched.c` — `xcesched_push_jobs` collects via the committed-only wrapper; `xcesched_push_joblist` (JOB_NEW incremental push) filters its list with the same predicate +- `job.c` / `persist.c` — tagging: live path sets `submit_lsn = written_lsn` in `persist_job_hook_fun` (persist.c:1107-1125); replay path threads `hdr->lsn` from `apply_wal_entry` (persist.c:691/729-731) into `restore_job` (job.c:71) +- `src/include/xce/types.h` — `job_t` wrapper (types.h:483-485) gains `uint64_t submit_lsn` (0 = unknown/pre-feature = exportable); wire type `xce_job_t` untouched + +## System Flows + +### Demotion convergence (role lifecycle, after this spec — umbrella flow sliced) + +```mermaid +sequenceDiagram + participant RL as raft library + participant BF as raft_cb_become_follower + participant DM as delaymgr task + participant P as persist.c + participant OS as process + RL->>BF: higher term seen while PRIMARY + BF->>BF: disable persistence hooks (inline, first) + BF->>BF: set CTRL_STANDBY, cancel timers (existing) + BF->>DM: schedule demotion convergence (one-shot) + DM->>P: persist_truncate_wal_above(committed_lsn) + DM->>DM: WARN log: truncated (committed_lsn, prior tip] + DM->>OS: ha_self_restart: execv(saved argv) + alt exec fails + OS->>OS: FATAL (abort) — never continue divergent + else XCE_TESTING + DM->>DM: ha_restart_hook seam invoked instead + end + OS-->>P: boot: persist_recover replays committed prefix only +``` + +Key decisions: hooks are disabled synchronously in the callback (no provisional entry may be produced after the higher term is observed — 1.1); truncation and exec are deferred off the callback thread (iomgr-safe — D1); truncation always precedes restart so boot replay yields committed-only state (1.2, 1.3, 1.7); crash before/during the task is safe — the rejoin reconciliation flow covers the untruncated-suffix case. + +### Rejoin reconciliation (generalizes RDHUP truncation, ha.c:3416-3420) + +```mermaid +sequenceDiagram + participant PRI as primary + participant CL as cluster.c intake + participant RR as ha_rejoin_reconcile + participant P as persist.c + PRI->>CL: CtrlHelloReply (committed_lsn) + CL->>CL: store last_known_committed_lsn (existing) + CL->>RR: evaluate(local tip vs boundary) + alt tip > boundary and not already reconciled + RR->>P: truncate above max(boundary, local committed_lsn) + RR->>RR: WARN log range, set once-guard + RR->>RR: ha_self_restart (same primitive) + else tip <= boundary + RR->>CL: no action — join proceeds (2.3) + end +``` + +Key decisions: the clamp `max(primary_reported, local committed_lsn)` never discards the locally known committed prefix (2.2); "once" is structural — after restart the tip equals the boundary, so the condition cannot re-fire (plus a defensive in-process flag) (2.1); together with demotion convergence and the never-retroactive-success rule this yields single-outcome convergence, asserted end-to-end (2.4). + +### Commit-gated scheduler egress + +Live submit: `persist_job_hook_fun` appends the submit entry and tags `j->submit_lsn = written_lsn`. Export time (scheduler-bound only — full push on scheduler join, JOB_NEW incremental push): `job_submit_committed` admits the job iff `submit_lsn == 0 || submit_lsn <= committed_lsn` (one atomic load, lock-free — 3.1, 3.2). Replay/standby apply tags from the entry LSN; on a promoted primary, replayed entries sit at or below the promotion truncation point, so restored jobs are exportable by construction (3.3). Status/API readers bypass the predicate entirely (3.4). Accepted edge (documented): a timeout-failed submit that later commits reaches the scheduler at the next scheduler (re)join full push — the requester keeps its failure answer (2.4 alignment). + +### ACK-driven catch-up continuation + +```mermaid +sequenceDiagram + participant S as standby + participant IO as iomgr (walAck branch) + participant DM as delaymgr continuation + participant CR as ha_stream_wal_to_standby + S->>IO: WalAckReply(acked_lsn) + IO->>IO: repl_on_ack (existing; feeds commit engine) + alt acked_lsn < target = max(committed, last_written) + IO->>DM: schedule continuation if not already in flight + DM->>CR: stream [acked_lsn+1, target] (enqueue-only) + DM->>DM: clear in-flight flag + CR-->>S: next batches + else acked_lsn >= target + IO->>IO: repl_complete_catchup → re-inclusion (7.1) + end +``` + +Key decisions: continuation is scheduled from the walAck branch (ha.c:2737-2754) but executes on delaymgr (streaming reads WAL files — never on iomgr); the per-standby single-flight flag bounds concurrency (5.2); target re-derivation each round naturally extends the stream to entries appended meanwhile (5.1); the heartbeat decision loop is untouched — it remains the fallback initiator and the only snapshot-decision owner (5.3, 6.1); parity wires the existing-but-untriggered `repl_complete_catchup` (7.1). + +## Requirements Traceability + +| Requirement | Summary | Components | Flows | +|-------------|---------|------------|-------| +| 1.1 | hooks disabled on demotion before anything else | Demotion Convergence | demotion | +| 1.2 | truncate above committed_lsn on demotion | Demotion Convergence | demotion | +| 1.3 | self-restart rebuilds via boot recovery | Demotion Convergence, Self-Restart Primitive | demotion | +| 1.4 | exec failure → FATAL | Self-Restart Primitive | demotion | +| 1.5 | WARN log with truncation range | Demotion Convergence | demotion | +| 1.6 | XCE_TESTING restart seam | Self-Restart Primitive | demotion | +| 1.7 | state reconstructible from committed log | Demotion Convergence (boot recovery reuse) | demotion | +| 2.1 | rejoin: tip > boundary → truncate + restart once | Rejoin Reconciliation | rejoin | +| 2.2 | never truncate own committed prefix | Rejoin Reconciliation (clamp) | rejoin | +| 2.3 | tip <= boundary → no action | Rejoin Reconciliation | rejoin | +| 2.4 | single outcome, never retroactive success | Demotion Convergence + Rejoin Reconciliation (E2E) | demotion, rejoin | +| 3.1 | uncommitted submit excluded from scheduler export | Egress Filter | egress | +| 3.2 | included once committed | Egress Filter | egress | +| 3.3 | submit_lsn tagging live + replay | Egress Filter (tagging) | egress | +| 3.4 | status/API reads unfiltered | Egress Filter (boundary) | egress | +| 4.1 | full fan-out to all reachable standbys | Convergence Verification Suite (existing `repl_broadcast`) | — | +| 5.1 | continuation on walAck, no heartbeat wait | ACK-Driven Catch-up | catch-up | +| 5.2 | single-flight per standby | ACK-Driven Catch-up | catch-up | +| 5.3 | heartbeat loop stays fallback + snapshot initiator | ACK-Driven Catch-up (boundary) | catch-up | +| 6.1 | snapshot fallback for far-behind standby | Convergence Verification Suite (existing path) | — | +| 7.1 | re-inclusion at parity | ACK-Driven Catch-up (parity trigger), Convergence Verification Suite | catch-up | +| 8.1 | quorum-loss logged with counts | Quorum Observability | — | +| 8.2 | quorum-restore logged | Quorum Observability | — | +| 8.3 | once per transition, no storms | Quorum Observability | — | +| 9.1 | status served while quorum lost | Convergence Verification Suite (existing gate allowlist) | — | +| 9.2 | replication traffic served while quorum lost | Convergence Verification Suite (existing gate allowlist) | — | + +## Components and Interfaces + +| Component | Layer | Intent | Req Coverage | Key Dependencies | Contracts | +|-----------|-------|--------|--------------|------------------|-----------| +| Demotion Convergence | controller/ha.c | PRIMARY→follower: disable hooks, truncate, log, restart | 1.1–1.3, 1.5, 1.7, 2.4 | persist truncation + recovery (P0), delaymgr (P0), Self-Restart (P0) | State | +| Self-Restart Primitive | controller/ha.c, main.c | re-exec saved argv; FATAL on failure; test seam | 1.3, 1.4, 1.6 | saved argv (P0) | Service | +| Rejoin Reconciliation | controller/ha.c, cluster.c | clamped truncation + one restart at rejoin | 2.1–2.4 | CtrlHelloReply intake (P0), persist truncation (P0), Self-Restart (P0) | State | +| Egress Filter | controller/dataex.c, sched.c, job.c, persist.c, types.h | watermark gate on scheduler-bound exports | 3.1–3.4 | committed_lsn (P0, read-only) | Service | +| ACK-Driven Catch-up | controller/ha.c, config_repl.c | continuation on walAck; parity re-inclusion | 5.1–5.3, 7.1 | walAck branch (P0), ha_stream_wal_to_standby (P0), repl_complete_catchup (P0), delaymgr (P0) | Event | +| Quorum Observability | controller/ha.c, ha.h | WARN once per quorum transition | 8.1–8.3 | ha_has_write_quorum (P0) | Service | +| Convergence Verification Suite | testsuite/, E2E | pin existing 6.1/6.3/6.4/7.3 behaviors + 3-node convergence | 2.4, 4.1, 6.1, 7.1, 9.1, 9.2 | /xce-deploy-ha (E2E only; needs ha-single-leader-role) | — | + +### Demotion Convergence + Self-Restart Primitive (`ha.c`, `main.c`) + +| Field | Detail | +|-------|--------| +| Intent | Discard the demoted ex-primary's provisional state by truncation + boot-recovery restart | +| Requirements | 1.1–1.7, 2.4 | + +**Responsibilities & Constraints** +- `raft_cb_become_follower` gains a was-PRIMARY branch (prior role read before the existing role store): synchronously disable the three persistence hooks (reuse the `ha_demote_to_standby` disable sequence + `hooks_registered` reset, ha.c:1712-1726 — currently uncalled from this path), then schedule the one-shot convergence task; all existing behavior (timer cancel, vote-ep close, STANDBY store, watchdog arm) is preserved for the non-PRIMARY cases +- Convergence task (delaymgr): `persist_truncate_wal_above(&c->persist, committed_lsn)` where `committed_lsn` is read from `persist_t` at task time; WARN with both LSNs (boundary and prior tip); then `ha_self_restart(c)` +- Deliberate scoping: a demotion from `CTRL_PRIMARY_COMMITTING` (a state still extant if this spec lands before ha-single-leader-role removes it) takes the legacy become-follower path with no truncation/restart — acceptable because a COMMITTING node has no registered persistence hooks and has appended no new entries, so its exposure is identical to today's +- `ha_self_restart`: flush logs; `execv` of `controller_saved_argv()`; if exec returns → ERROR + `abort()` (FATAL — 1.4). Under `XCE_TESTING`, invoke `ha_restart_hook(c)` instead and return (1.6); a settable fatal seam lets tests assert the FATAL path without dying +- fd hygiene: before exec, verify/ensure listener and peer fds do not leak into the new image (CLOEXEC audit; boot path re-creates all endpoints) +- Crash safety: if the node dies before the task runs, its untruncated suffix is handled by Rejoin Reconciliation at the next join — the two components together guarantee 2.4 + +##### Service Interface +```c +/* ha.h — controller-internal */ +/* Saved-argv accessor (main.c populates before argp_parse). NULL-terminated. */ +char **controller_saved_argv(void); + +/* Truncate-and-restart primitive. Never returns in production (exec or abort). + * Under XCE_TESTING returns 0 after invoking ha_restart_hook. */ +int ha_self_restart(cluster_t *c); + +#ifdef XCE_TESTING +extern int (*ha_restart_hook)(cluster_t *c); /* invoked instead of execv */ +extern void (*ha_fatal_hook)(const char *msg); /* invoked instead of abort */ +#endif +``` +- Preconditions: persistence hooks already disabled; truncation completed before `ha_self_restart` is called +- Postconditions (production): process image replaced; next boot replays only the surviving prefix +- Invariants: no new WAL entry is appended by this node between hook-disable and exec + +### Rejoin Reconciliation (`ha.c` + `cluster.c` intake) + +| Field | Detail | +|-------|--------| +| Intent | Converge a rejoining node whose log runs ahead of the cluster's committed boundary | +| Requirements | 2.1–2.4 | + +Summary: new `int ha_rejoin_reconcile(cluster_t *c, uint64_t primary_committed_lsn)` called from the `CtrlHelloReply` intake (cluster.c:283-298) after the existing `last_known_committed_lsn` store. Decision: `local_tip = persist.current_lsn - 1`; if `local_tip > primary_committed_lsn` and the once-guard is clear → cutoff = `max(primary_committed_lsn, local committed_lsn)` (clamp, 2.2) → `persist_truncate_wal_above(cutoff)` → WARN with range → set once-guard → `ha_self_restart`. Otherwise return 0 with no side effects (2.3). The truncation/restart work is deferred to a delaymgr task if the intake runs on iomgr (same rule as demotion). Generalizes the RDHUP truncation (ha.c:3416-3420), which remains in place for the failover path. Once-guard is structural (post-restart tip equals the boundary) plus a defensive `_Atomic int rejoin_reconciled` for the process lifetime (2.1). + +### Egress Filter (`dataex.c`, `sched.c`, `job.c`, `persist.c`, `types.h`) + +| Field | Detail | +|-------|--------| +| Intent | One-watermark commit gate on scheduler-bound job exports | +| Requirements | 3.1–3.4 | + +**Responsibilities & Constraints** +- `job_t` wrapper (types.h:483-485) gains `uint64_t submit_lsn`; `0` = unknown/pre-feature = exportable (legacy WALs and pre-tagging jobs never strand); wire type `xce_job_t` unchanged +- Tagging: live — `persist_job_hook_fun` (persist.c:1107-1125) sets `submit_lsn = written_lsn` on each submitted job after a successful append; replay/standby apply — `apply_wal_entry` (persist.c:729-731) passes `hdr->lsn` to `restore_job` (job.c:71), which tags the restored job (3.3) +- Predicate (dataex.c): `bool job_submit_committed(cluster_t *c, job_t *j)` → `j->submit_lsn == 0 || j->submit_lsn <= atomic_load(committed_lsn)`; lock-free, one comparison +- Consumers (scheduler-bound only): `collect_jobs_committed()` wrapper in dataex.c used by `xcesched_push_jobs` (sched.c:183); the JOB_NEW incremental push (`xcesched_push_joblist`, fed by `sched_job_new_fun` sched.c:236-248) filters its list with the same predicate. Both seams verified in the anchor pass — research D3 +- Non-consumers (3.4): apiserver.c:83 and opget.c:173 keep plain `collect_jobs` — status/API reads intentionally unfiltered (documented deviation; read consistency out of scope) + +##### Service Interface +```c +/* dataex.h additions — controller-internal */ +bool job_submit_committed(cluster_t *c, job_t *j); /* watermark predicate */ +void collect_jobs_committed(cluster_t *c, collect_check_fn_t fn, xlist_t *l); +/* identical contract to collect_jobs, additionally excluding jobs whose + * submit entry is uncommitted; for scheduler-bound callers ONLY */ +``` +- Invariant: a job with `submit_lsn > committed_lsn` is never present in a scheduler-bound export payload; the same job remains visible to status/API reads + +### ACK-Driven Catch-up (`ha.c` walAck branch + `config_repl.c` continuation) + +| Field | Detail | +|-------|--------| +| Intent | Continue catch-up streaming at ACK speed; re-include at parity | +| Requirements | 5.1–5.3, 7.1 | + +**Responsibilities & Constraints** +- Trigger (iomgr, ha.c:2737-2754): after the existing `repl_on_ack`, compare `acked_lsn` to `target = max(committed_lsn, last_written)` (same derivation as ha.c:2727-2732). Behind target → schedule the continuation task unless the standby's `catchup_inflight` flag is set (5.2); at/above target → `repl_complete_catchup(&c->persist.repl, ep)` (7.1 — wires the existing, currently untriggered re-inclusion; ha-commit-engine's wiring propagates `commit_on_membership_change`) +- Continuation task (delaymgr, config_repl.c): re-derive target, call `ha_stream_wal_to_standby(ep, wal_path, acked_lsn, target)` (unchanged internals, enqueue-only), clear `catchup_inflight`. Endpoint validity is re-checked against the standby registry at task time (the ep may have RDHUPed between schedule and run) +- Per-standby state: `_Atomic int catchup_inflight` keyed by the standby slot (placed alongside the existing per-peer arrays in `ha_state_t` or `standby_conn_t` — slot identity must survive between schedule and completion) +- The heartbeat decision loop (`ha_dispatch_repl_action_for_standby`, ha.c:1373-1478) is byte-identical: fallback initiator for standbys that never ACK, and sole owner of the snapshot decision (5.3; snapshot fallback 6.1 of this spec verified, not modified) +- Never blocks iomgr: scheduling is O(1); all file I/O is inside the delaymgr task + +### Quorum Observability (`ha.c`, `ha.h`) + +| Field | Detail | +|-------|--------| +| Intent | Operator-visible quorum-loss/restore transitions | +| Requirements | 8.1–8.3 | + +Summary: `ha_state_t` gains `_Atomic int quorum_lost` (0 at init). New `ha_log_quorum_transition(ha_state_t *ha)`: evaluate `ha_has_write_quorum`; on edge, atomically flip the flag and WARN once — loss: `"HA quorum lost: connected=%d required=%d"`; restore: `"HA quorum restored: connected=%d required=%d"` (8.1, 8.2). Call sites: the three standby_endpoints mutation points (promotion registration ha.c:531, RDHUP removal ha.c:3160-3166, `on_standby_connected` ha.c:3764+) plus the `ha_dispatch_gate` quorum-rejection branch as a backstop (flag check makes repeated rejections silent — 8.3). CAS on the flag guarantees once-per-transition under concurrency. Note: the promotion-registration anchor (ha.c:531) lives inside `raft_cb_become_leader` (ha.c:445-617), leader-role promotion code that ha-single-leader-role owns and rewrites wholesale — this call site must be re-anchored after ha-single-leader-role lands (or coordinated with that spec if this one is implemented first); see Revalidation Triggers. + +### Convergence Verification Suite (testsuite/, E2E) + +Summary: regression pins for the four existing behaviors the umbrella marked "Done (verify)": full fan-out (`repl_broadcast` reaches every active standby — 4.1), snapshot-fallback decision (`standby_lsn < oldest_wal_lsn` → HA_REPL_SEND_SNAPSHOT — 6.1), re-inclusion mechanism (`repl_complete_catchup` clears `in_catch_up`, standby re-enters broadcast and quorum — 7.1), degraded-mode allowlist (gate admits status + replication opcodes without quorum — 9.1, 9.2). Plus the 3-node E2E extending ha-wal-replication task 5.4: confirmed jobs survive failover; a timeout-failed submit converges to a single outcome on all members; the demoted ex-primary restarts once and rejoins converged; status served during isolation (2.4 + live 9.1). E2E requires ha-single-leader-role landed and a live `/xce-deploy-ha` cluster. + +## Data Models + +### Domain Model (changes only) +- **job_t** (types.h wrapper): + `uint64_t submit_lsn` — entry LSN of the job's submit record; `0` = unknown/exportable; in-memory only (recomputed at replay from the applied entry; never serialized — wire type unchanged) +- **ha_state_t**: + `_Atomic int quorum_lost` (transition edge detector); + per-standby `_Atomic int catchup_inflight[MAX_HA_CANDIDATES]` (single-flight guard); + `_Atomic int rejoin_reconciled` (defensive once-guard) +- **process**: saved argv (main.c static, NULL-terminated) — the restart vehicle +- Invariants: scheduler-bound exports contain only jobs with `submit_lsn <= committed_lsn` (or 0); at most one continuation in flight per standby; at most one rejoin reconciliation per process lifetime; truncation always precedes restart + +## Error Handling + +### Error Strategy +- Self-restart exec failure → ERROR log + `abort()` (FATAL) — a divergent ex-primary must never continue serving (locked constraint); under XCE_TESTING the fatal seam records instead of aborting +- Truncation failure during demotion/rejoin → ERROR, then restart anyway: boot replay of an untruncated log is reconciled at the next rejoin (the reconciliation loop converges); never proceed as a serving node past a failed convergence step +- Continuation-task endpoint gone at run time → clear in-flight flag and return (the heartbeat fallback re-evaluates) — no error surfaced +- Egress predicate is infallible (atomic load + compare); tagging failures cannot occur on the success path (tag set only after a successful append) +- Quorum logging is observability-only: WARN once per transition, never an error path, never gates the operation outcome (the gate's existing `-XCE_ERR_NOT_READY` behavior is unchanged) + +### Monitoring +- WARN logs: demotion truncation range; rejoin reconciliation range; quorum lost/restored with counts. INFO: continuation scheduling at TRACE/INFO consistent with existing streaming logs. Metrics export out of scope (umbrella). + +## Testing Strategy + +### Unit Tests (testsuite/, XCE_TESTING) +- `test_demotion_convergence.c`: become-follower from PRIMARY → hooks disabled before role store, truncation called with `committed_lsn` cutoff, WARN logged, `ha_restart_hook` invoked (1.1–1.3, 1.5, 1.6); exec-failure path invokes the fatal seam (1.4); become-follower from non-PRIMARY roles → no truncation/restart (regression); rejoin reconcile: tip > boundary → clamped cutoff `max(boundary, local committed)` + restart-once (2.1, 2.2); tip <= boundary → no action (2.3); second invocation in one lifetime → no second restart (2.1) +- `test_egress_filter.c`: live submit tags `submit_lsn = written_lsn`; replayed WAL_JOB_SUBMIT tags from entry LSN (3.3); job with `submit_lsn > committed_lsn` absent from `collect_jobs_committed` and from the JOB_NEW push list, present after `committed_lsn` advances (3.1, 3.2); `submit_lsn == 0` exportable; plain `collect_jobs` (status path) returns the uncommitted job (3.4) +- `test_convergence_verification.c`: walAck behind target schedules exactly one continuation (hook-counted via `ha_repl_stream_wal_hook`/`xce_wal_stream_request_hook`), duplicate ACKs while in flight schedule none (5.1, 5.2); ACK at parity calls `repl_complete_catchup` and clears `in_catch_up` (7.1); heartbeat decision path byte-equivalent for snapshot decisions (5.3, 6.1 pin); `repl_broadcast` reaches all active standbys, skips only in_catch_up/empty (4.1 pin); quorum transition logged once across repeated gate rejections, restore logged on reconnection (8.1–8.3); dispatch gate admits status (`OPCode_get`) and replication opcodes without quorum, rejects request-shaped opcodes only (`OPCode_jobsub`/`jobcontrol`/`queuecontrol`/`hostcontrol`/`jobdispatch`/`join`) and admits fact-shaped opcodes (`OPCode_notify`/`update`/`setpreason`/`clrpreason`) per ha-commit-barrier-rollout's fact allowlist (9.1, 9.2 pin) + +### Integration Tests (testsuite/) +- Demotion seam end-to-end: simulated PRIMARY with appended uncommitted suffix sees higher term → truncation + restart hook; a fresh replay over the surviving log yields committed-only state (1.7, 2.4 in-process half) +- Rejoin reconciliation through the cluster.c intake: deliver a CtrlHelloReply with a boundary below the local tip → reconcile fires; boundary at/above tip → join proceeds untouched + +### E2E (live cluster, extends ha-wal-replication task 5.4 — REQUIRES ha-single-leader-role landed) +- 3-node via `/xce-deploy-ha`: submit confirmed jobs → kill primary → promoted standby owns all confirmed jobs; a submit forced to time out at the barrier converges to a single outcome on all members and is never retroactively reported successful; the demoted ex-primary restarts once and rejoins converged (2.4, 1.3, 2.1) +- 3-node: isolate primary → submits fail, status still served, quorum-loss WARN present; heal → quorum-restored WARN, submits succeed (8.1, 8.2, 9.1 live) + +## Performance & Scalability +- Egress predicate: one atomic load + compare per job per export — negligible against existing per-job serialization +- Continuation: at most one in-flight stream per standby; scheduling O(1) on iomgr; streaming cost unchanged (same `ha_stream_wal_to_standby`), just driven at ACK cadence instead of 3s heartbeats — catch-up latency improves by up to one heartbeat period per round +- Demotion/rejoin restart: process restart cost accepted by design (rare role/lifecycle events; connections migrate to the new primary anyway — umbrella-locked rationale) + +## Migration Strategy +This spec is phase 4 (final) of the umbrella's hard-ordered landing. It depends on ha-commit-engine (`committed_lsn` semantics) being live; it is parallel-safe with ha-commit-barrier-rollout and ha-single-leader-role except that the 3-node E2E requires ha-single-leader-role landed (direct promotion — the demotion path asserted here is the post-COMMITTING-removal one). Despite that parallel-safety, implementation in roadmap order is recommended regardless: all four sub-specs touch `ha_dispatch_gate` and `raft_cb_become_follower` in disjoint but adjacent regions, and in-order landing avoids anchor churn and merge coordination (per cross-spec review 2026-06-11). Landing order inside the spec: egress filter (pure additive) → demotion convergence + self-restart → rejoin reconciliation (reuses the primitive) → ACK-driven catch-up → quorum observability → verification suite → E2E. Rollback trigger per umbrella: controller testsuite regression or live-cluster E2E failure; each step leaves the system no less consistent than before it (filter defaults open via `submit_lsn == 0`; demotion/rejoin only ever discard above the committed boundary). diff --git a/.kiro/specs/ha-convergence-recovery/requirements.md b/.kiro/specs/ha-convergence-recovery/requirements.md new file mode 100644 index 0000000..1083be5 --- /dev/null +++ b/.kiro/specs/ha-convergence-recovery/requirements.md @@ -0,0 +1,125 @@ +# Requirements Document + +> Sub-spec 4 of 4 implementing the **ha-consistency-invariants** umbrella contract. +> The umbrella documents (`.kiro/specs/ha-consistency-invariants/requirements.md`, `design.md`, `research.md`) are the authoritative contract. This document restates the slice owned by this spec — umbrella criteria 2.4, 2.5, 2.7, 6.1, 6.2, 6.3, 6.4, 7.2, 7.3 — as this spec's own numbered requirements. Each criterion notes its umbrella ID; the traceability table at the end gives the full mapping. Umbrella criteria 6.1, 6.3, 6.4, and 7.3 are verification-of-existing-behavior requirements: they pin behavior that already exists with regression tests and introduce no new production code. + +## Project Description (Input) + +Five verified convergence gaps undermine the umbrella's single-outcome guarantee (research deep-dive §C): a demoted ex-primary never truncates its divergent WAL suffix; phantom provisional in-memory state is never evicted; restart replays the uncommitted suffix (committed_lsn is volatile, correctly per Raft, but nothing reconciles at rejoin); standby apply has no conflict detection; and uncommitted jobs leak to the scheduler during the commit window (orphan-dispatch risk). Cluster operators need cluster-wide single-outcome convergence and commit-gated egress: demotion truncates above `committed_lsn` and self-restarts through the existing boot recovery (provisional state discarded); a rejoining standby whose WAL tip exceeds the primary's committed boundary truncates and restarts once; the scheduler export path never sees a job whose submit entry is uncommitted; catch-up streaming continues on WAL acknowledgment without waiting for heartbeats; and quorum-loss transitions are operator-visible in logs. + +## Introduction + +This spec delivers the convergence-and-recovery slice of the umbrella contract. After this spec, an operation that timed out at the commit barrier converges to a single cluster-wide outcome: a demoted primary discards its provisional state by truncating its uncommitted WAL suffix and restarting through boot recovery; a rejoining node whose log runs ahead of the cluster's committed boundary reconciles by truncation and a one-time restart; and the scheduler — the consumer whose actions cannot be revoked — never observes a job whose submit entry is uncommitted. Catch-up of lagging standbys becomes acknowledgment-driven rather than heartbeat-polled, and entry into and exit from the quorum-lost degraded state is recorded in the log for operators. Existing behaviors the umbrella relies on — full fan-out replication, snapshot fallback for far-behind standbys, re-inclusion of caught-up standbys, and degraded-mode status service — are pinned with regression tests. + +## Boundary Context + +- **In scope**: Demotion convergence on the primary (disable persistence hooks, truncate above committed LSN, log, process self-restart, with a test-mode restart seam); rejoin reconciliation for a standby whose WAL tip exceeds the primary's committed boundary; commit-watermark egress filtering of scheduler-bound job exports (job submit-LSN tagging); acknowledgment-driven catch-up streaming continuation; quorum-loss/restore transition logging; regression tests pinning full fan-out, snapshot fallback, re-inclusion, and degraded-mode status service; the 3-node E2E convergence test extending ha-wal-replication task 5.4. +- **Out of scope**: Commit-index advancement and majority evaluation (ha-commit-engine — this spec consumes `committed_lsn`, never modifies `commit.c`); operation classification and reply ordering (ha-commit-barrier-rollout); promotion no-op, own-term gate consumers, and CTRL_PRIMARY_COMMITTING removal (ha-single-leader-role); entity-bearing snapshots (roadmap backlog — would later upgrade the eviction strategy); read-consistency filtering of status/API queries (documented deviation, future work); primary step-down on quorum loss (roadmap); worker rejoin job-state resync (roadmap backstop for facts lost across the restart this spec introduces); election/vote correctness (raft-library); replication wire format (ha-wal-replication). +- **Adjacent expectations**: Upstream, this spec relies on ha-commit-engine's `committed_lsn` semantics (per-LSN majority, monotonic, contiguous — complete) and on ha-wal-replication's ACK machinery and catch-up streaming. The full 3-node E2E additionally requires ha-single-leader-role to have landed (direct promotion, no transitional state); E2E tasks are explicitly marked with that dependency. Downstream, entity-bearing snapshots may upgrade demotion eviction from restart to snapshot-based rebuild, and worker-rejoin-resync recovers worker-reported facts across the restart this spec introduces. + +## Requirements + +### Requirement 1: Demotion Convergence (Truncate and Self-Restart) + +**Objective:** As a cluster operator, I want a demoted ex-primary to discard its uncommitted, potentially divergent state and rejoin from its committed state only, so that a failed-over cluster converges to a single outcome and a demoted node never keeps serving phantom state. + +#### Acceptance Criteria + +1. When a primary observes a higher term and is demoted, the controller shall stop persisting new state changes before continuing demotion, so that no further provisional entries are produced. *(umbrella 2.5)* +2. When a primary is demoted, the controller shall remove from its log all entries above its committed LSN. *(umbrella 2.5)* +3. When demotion truncation completes, the controller shall restart its own process so that in-memory state is rebuilt through boot recovery from the persisted committed state only, discarding all provisional in-memory state. *(umbrella 2.5, 2.7)* +4. If the process self-restart cannot be performed, the controller shall terminate fatally rather than continue running with potentially divergent state. *(umbrella 2.5; locked constraint)* +5. When a demotion occurs, the controller shall log the event with the truncation boundary (committed LSN and prior log tip) before restarting, so that operators can observe the discarded range. *(umbrella 2.5)* +6. Where test mode is enabled, the controller shall invoke a substitutable restart seam in place of process re-execution. *(locked constraint — testability)* +7. The controller shall be able to reconstruct its in-memory state from its persisted committed state, discarding any provisional state not present in the committed log. *(umbrella 2.7)* + +### Requirement 2: Rejoin Reconciliation and Single-Outcome Convergence + +**Objective:** As a cluster operator, I want a rejoining node whose log runs ahead of the cluster's committed boundary to reconcile by truncation and a one-time restart, so that every member's state converges to the same outcome even after a crash that skipped demotion convergence. + +#### Acceptance Criteria + +1. When a standby learns the primary's committed boundary at (re)join and its local log tip exceeds that boundary, the standby shall truncate its log above that boundary and restart its process once. *(umbrella 2.5)* +2. The standby shall not remove log entries at or below its own locally known committed LSN during rejoin reconciliation. *(umbrella 2.5 — safety clamp; commit index never regresses)* +3. While a standby's local log tip does not exceed the primary's committed boundary at rejoin, the standby shall join without truncation or restart. *(umbrella 2.5 — no spurious restarts)* +4. If an operation was reported as failed due to commit timeout, the cluster shall converge on a single outcome for its log entry — committed on all members or discarded on all members — the primary shall never retroactively report that operation as successful to the original requester, and each member's in-memory state shall converge to that same outcome. *(umbrella 2.5 — verified end-to-end)* + +### Requirement 3: Commit-Gated Scheduler Egress + +**Objective:** As a cluster operator, I want the scheduler to never observe a job whose submit entry is uncommitted, so that no job can be dispatched whose existence the post-failover cluster may never have heard of (orphan-dispatch prevention). + +#### Acceptance Criteria + +1. While a job's submit entry is not yet committed, the controller shall exclude that job from data exports that drive scheduling and dispatch decisions. *(umbrella 2.4)* +2. When a job's submit entry becomes committed, the controller shall include that job in subsequent scheduler-bound exports. *(umbrella 2.4)* +3. When a job is created or restored from the persisted log, the controller shall associate the job with the log position of its submit entry so its commit status is decidable at export time. *(umbrella 2.4)* +4. While a job's submit entry is not yet committed, the controller shall continue to include the job in status and API query responses; read paths are intentionally not commit-filtered. *(umbrella 2.4 boundary — documented deviation; read consistency is out of scope)* + +### Requirement 4: Full Fan-Out Replication (Verification of Existing Behavior) + +**Objective:** As a cluster operator, I want the primary to replicate to every reachable standby, so that the cluster trends toward full consistency — pinned by regression test, since the umbrella relies on this existing behavior. + +#### Acceptance Criteria + +1. While holding leadership, the primary shall replicate new log entries to all reachable standbys, not only to a majority subset. *(umbrella 6.1 — existing behavior, regression test only)* + +### Requirement 5: Acknowledgment-Driven Catch-Up Continuation + +**Objective:** As a cluster operator, I want a lagging standby brought current as fast as it can acknowledge, so that catch-up progress is not throttled to the heartbeat cadence. + +#### Acceptance Criteria + +1. When the primary receives a WAL acknowledgment from a standby that remains behind the replication target, the primary shall continue streaming the missing entries to that standby without waiting for the next heartbeat exchange. *(umbrella 6.2)* +2. While a catch-up continuation for a standby is already in flight, the primary shall not start a duplicate continuation for that standby. *(umbrella 6.2 — bounded continuation, no streaming storms)* +3. The heartbeat-driven replication evaluation shall remain in place as the fallback initiator of catch-up and as the initiator of snapshot-transfer decisions. *(umbrella 6.2, 6.3 — locked design boundary)* + +### Requirement 6: Snapshot Fallback (Verification of Existing Behavior) + +**Objective:** As a cluster operator, I want a standby that has fallen behind the oldest retained log entry brought current via snapshot, so that log retention limits never strand a member — pinned by regression test. + +#### Acceptance Criteria + +1. If a standby is behind the oldest retained log entry, the primary shall bring it current by transferring a snapshot followed by subsequent log entries. *(umbrella 6.3 — existing behavior, regression test only)* + +### Requirement 7: Catch-Up Re-Inclusion (Verification of Existing Behavior) + +**Objective:** As a cluster operator, I want a standby that has caught up re-included in live replication, so that it counts toward future commits — pinned by regression test. + +#### Acceptance Criteria + +1. When a lagging standby catches up to the primary's replication boundary, the primary shall re-include it in live replication. *(umbrella 6.4 — existing re-inclusion mechanism, regression test; the acknowledgment-driven continuation of Requirement 5 provides the production trigger at parity)* + +### Requirement 8: Quorum Transition Observability + +**Objective:** As a cluster operator, I want entry into and exit from the quorum-lost degraded state recorded in the log, so that I can observe and correlate degraded periods without instrumentation. + +#### Acceptance Criteria + +1. When the primary loses write quorum, the controller shall record the transition in its log, including the connected and required member counts. *(umbrella 7.2)* +2. When write quorum is restored, the controller shall record the transition in its log. *(umbrella 7.2)* +3. While quorum remains lost, the controller shall not repeatedly log the loss condition for every rejected operation; the transition shall be logged once per state change. *(umbrella 7.2 + umbrella error strategy — no log storms)* + +### Requirement 9: Degraded-Mode Service Continuity (Verification of Existing Behavior) + +**Objective:** As a cluster operator, I want a quorum-lost primary to keep answering status queries and replication traffic, so that the degraded cluster remains observable and can heal itself — pinned by regression test. + +#### Acceptance Criteria + +1. While quorum is lost, the primary shall continue to respond to status queries. *(umbrella 7.3 — existing dispatch-gate allowlist, regression test only)* +2. While quorum is lost, the primary shall continue to process replication-related traffic from returning members. *(umbrella 7.3 — existing dispatch-gate allowlist, regression test only)* + +## Umbrella Traceability + +| This spec | Umbrella ID | Notes | +|-----------|-------------|-------| +| 1.1–1.7 | 2.5, 2.7 | Demotion convergence: hook disable, truncate above committed_lsn, self-restart via boot recovery; FATAL on restart failure; XCE_TESTING seam (locked decisions) | +| 2.1–2.3 | 2.5 | Rejoin reconciliation — generalizes the existing RDHUP truncation pattern to the rejoin/hello path; restart at most once | +| 2.4 | 2.5 | Single-outcome convergence incl. in-memory state; never retroactive success — E2E-verified | +| 3.1–3.3 | 2.4 | Provisional-state egress gate: watermark filter on the submit entry's LSN, scheduler export only (locked decision) | +| 3.4 | 2.4 boundary | Status/API queries intentionally unfiltered — documented deviation (read consistency out of scope) | +| 4.1 | 6.1 | Verification of existing full fan-out broadcast — regression test, no new code | +| 5.1–5.3 | 6.2 | ACK-driven catch-up continuation; heartbeat path remains fallback + snapshot initiator | +| 6.1 | 6.3 | Verification of existing snapshot fallback — regression test, no new code | +| 7.1 | 6.4 | Verification of existing re-inclusion — regression test; Requirement 5 supplies the parity trigger | +| 8.1–8.3 | 7.2 | Quorum-loss/restore WARN logging, once per transition | +| 9.1, 9.2 | 7.3 | Verification of existing degraded-mode allowlist — regression test, no new code | diff --git a/.kiro/specs/ha-convergence-recovery/research.md b/.kiro/specs/ha-convergence-recovery/research.md new file mode 100644 index 0000000..added24 --- /dev/null +++ b/.kiro/specs/ha-convergence-recovery/research.md @@ -0,0 +1,81 @@ +# Research & Design Decisions: ha-convergence-recovery + +Date: 2026-06-11. Discovery type: integration-focused (extension of existing HA subsystem); the umbrella's `research.md` (deep-dive §C — five convergence gaps) is the primary discovery source. This log records the slice-level anchor verification pass and the design decisions local to this sub-spec. Umbrella-locked decisions are restated, not re-derived. + +## Umbrella-Locked Decisions (inputs, not open questions) + +- Demotion eviction = **truncate above `committed_lsn` + process SELF-RESTART** via the existing boot recovery (`persist_recover` + `replay_wal`) — option (ii) of umbrella research §C, user-decided 2026-06-11. Restart-hook seam under `XCE_TESTING`; **exec failure = FATAL** (a divergent ex-primary must not keep serving). Truncation always precedes restart. +- `commitIndex` is **volatile** per Raft — rejoin reconciliation, NOT persisted `committed_lsn`. +- Provisional-state model with **watermark egress filter**: `job_t.submit_lsn`, scheduler export only; status/API queries intentionally unfiltered (documented deviation). No undo log, no MVCC, no committed-view machinery. +- ACK-driven catch-up continuation; heartbeat evaluation remains the fallback initiator and the snapshot-decision owner. +- Umbrella 6.1/6.3/6.4/7.3 are existing behaviors — verified by regression test, no new production code. + +## 1. Anchor Verification Pass (2026-06-11, this worktree) + +All file:line anchors from the umbrella audit re-verified by grep before being written into design/tasks. Drift from the umbrella's 2026-06-10 numbers was negligible. + +| Anchor | Verified location | Finding | +|---|---|---| +| Demotion path | `raft_cb_become_follower` ha.c:627-690 | Confirmed gap: cancels timers, closes vote eps, sets CTRL_STANDBY — **never truncates, never disables hooks** (comment at ha.c:904 confirms hook disable lives only in `ha_demote_to_standby`) | +| Hook disable (unused on this path) | `ha_demote_to_standby` ha.c:1712-1726 | Disables the three persistence hooks + resets `hooks_registered`; NOT called from `raft_cb_become_follower` | +| Hook registration | `ha_promote_to_primary` ha.c:1686-1707 | Idempotency guard `hooks_registered`; symmetric disable exists | +| Truncation primitive | `persist_truncate_wal_above` persist.c:1306-1444 | Reused as-is; stores `committed_lsn = cutoff` at persist.c:1438 | +| RDHUP truncation pattern (to generalize) | ha.c:3416-3420 in `ha_on_primary_ctrl_fd_rdhup` | Truncates above local `ha->last_known_committed_lsn` | +| Rejoin signal point | cluster.c:283-298 | Standby stores the primary-reported `committed_lsn` from `CtrlHelloReply` into `ha->last_known_committed_lsn` — the natural rejoin-reconciliation hook | +| handle_ctrlhello | config_repl.c:1368 | Connection bookkeeping only; decisions live in the heartbeat loop | +| Boot recovery (reused by restart) | `persist_recover` persist.c:957, `replay_wal` persist.c:781 | Replays everything above `checkpoint_lsn` — no committed gate (umbrella gap 4; rejoin reconciliation is the fix, by design) | +| Heartbeat-driven repl decision loop | `ha_dispatch_repl_action_for_standby` ha.c:1373-1478; invoked from stateReport branch at ha.c:2734 | One action per heartbeat cycle per standby — confirms 6.2 gap | +| WAL ACK ingress (continuation hook point) | `repl_ack_decode_and_dispatch` ha.c:2632, walAck branch ha.c:2737-2754 → `repl_on_ack` repl.c:176 | Runs on iomgr (`peer_ctrl_msg_handler` ha.c:2777); replication target already computed as `max(committed_lsn, last_written)` at ha.c:2727-2732 | +| Catch-up streaming | `ha_stream_wal_to_standby` config_repl.c:1450-1583 | Streams `[standby_lsn+1, target]` in one call, enqueue-only; `xce_wal_stream_request_hook` test seam exists | +| Catch-up state | `repl_start_catchup` repl.c:507, `repl_complete_catchup` repl.c:521 | **Discovered gap**: `repl_complete_catchup` has NO production caller (in_catch_up set by eviction inline repl.c:240; documented protocol step 5 in config_repl.h:173 never wired). The ACK-driven continuation supplies the missing parity trigger (Req 7.1) | +| Quorum gate | `ha_has_write_quorum` ha.c:1507-1525, `ha_dispatch_gate` ha.c:1527+ | No transition logging anywhere; rejection is silent `-XCE_ERR_NOT_READY`. Allowlist for degraded mode at ha.c:1538-1558 (Req 9 regression target) | +| standby_endpoints mutations (quorum-change points) | ha.c:531 (promotion), ha.c:3160-3166 (RDHUP removal), `on_standby_connected` ha.c:3764+ | The three production sites where the quorum count changes | +| Scheduler export seams | `collect_jobs` dataex.c:294; scheduler full push `xcesched_push_jobs` sched.c:169/183 (on join, sched.c:609); **incremental push** `sched_job_new_fun` sched.c:236-248 → `xcesched_push_joblist` sched.c:14 | Two scheduler-bound egress seams, not one — see decision D3 | +| Unfiltered read paths (stay unfiltered) | apiserver.c:83, opget.c:173 (`OPCode_get`) | Both use `collect_jobs`; must NOT gain the filter (Req 3.4) | +| job_t | `src/include/xce/types.h:483-485` — `typedef struct { xce_job_t job; } job_t;` | Controller wrapper around the wire type; `submit_lsn` goes on the wrapper, wire format untouched | +| Replay restore | `apply_wal_entry` persist.c:691 → `restore_job` job.c:71 (WAL_JOB_SUBMIT at persist.c:729-731) | `restore_job` does not currently receive the entry LSN — tagging at replay needs it passed through | +| Submit-path append | `persist_job_hook_fun` persist.c:1107-1125, `persist_wal_sync_append` persist.c:1003+ (`written_lsn` at 1018-1020) | Tagging point for live submits | +| Controller entry | `main` main.c:112 | **No saved argv, no execv anywhere in src/controller or src/lib** — self-restart machinery is net-new | +| Hook chain semantics | `xce_run_hooks` hook.c:101-141 | AFTER hooks all run in registration order; rc = last hook's rc; sched hooks registered at scheduler join (sched.c:616), persist hooks at promotion (ha.c:1692) — relative order is timing-dependent (input to D3) | +| E2E baseline | ha-wal-replication tasks.md task 5.4 (line 111) | Live 3-node test, `/xce-deploy-ha`, still unimplemented (blocked-manual); this spec's E2E extends it | +| Test seam pattern | `ha_repl_stream_wal_hook` ha.c:2104, `ha_phase2_hook`, `xce_wal_stream_request_hook` | Established `XCE_TESTING` function-pointer seam style for the restart hook | + +## 2. Slice-Level Design Decisions + +**D1 — Demotion convergence runs off the callback thread.** `raft_cb_become_follower` can fire from vote handling (vtask) or peer message handling (iomgr). Truncation is file I/O and restart is process-fatal; per `ha-async-io.md` neither may run on iomgr. Decision: the become-follower callback detects PRIMARY→follower, disables persistence hooks inline (atomic, cheap — must happen before any further write), then schedules a one-shot demotion-convergence task (delaymgr, existing pattern) that truncates, WARN-logs the range, and self-restarts. The restart (exec) ends participation; any entry applied in the tiny window between truncation and exec is re-replayed at boot — harmless. + +**D2 — Self-restart mechanism.** `main()` saves `argv` (new `controller_saved_argv` accessor in main.c) before `argp_parse`. New `ha_self_restart()` in ha.c: flush logs, `execv(saved_argv[0], saved_argv)`; on exec failure log ERROR and `abort()` (FATAL — locked constraint). Under `XCE_TESTING`, `ha_restart_hook` function-pointer seam is invoked instead (and FATAL is asserted via a settable fatal hook rather than aborting the test binary). Implementation note: audit listener/connection fds for `FD_CLOEXEC` before exec (task bullet) so the re-exec'd image doesn't inherit live sockets. + +**D3 — Egress filter seams (refinement, not contradiction).** The umbrella names `collect_jobs` (dataex.c) as the scheduler export path. Anchor verification found TWO scheduler-bound egress seams: (a) the collect-based full push (`xcesched_push_jobs`, on scheduler join) and (b) the incremental JOB_NEW push (`sched_job_new_fun` → `xcesched_push_joblist`), whose ordering relative to the persist hook (and hence the commit wait) is registration-timing-dependent. Both are "exports that drive scheduling decisions" (umbrella 2.4), so the same watermark rule applies at both. Decision: one shared predicate `job_submit_committed(cluster_t*, job_t*)` (`submit_lsn == 0 || submit_lsn <= committed_lsn`; exported from dataex.c next to the collect machinery), consumed by (a) a scheduler-bound collect wrapper in dataex.c and (b) a filter pass in the JOB_NEW push list. Status/API readers (apiserver.c, opget.c) keep calling unfiltered `collect_jsons`/`collect_jobs` — Req 3.4. Known accepted edge (documented deviation, matches umbrella 2.5 semantics): a submit that times out at the barrier but commits later is visible to the scheduler at the next scheduler (re)join full push — the requester was already told "failed"; never retroactively reported successful. + +**D4 — submit_lsn semantics.** `0` = pre-feature/unknown → treated as committed (export allowed) so replayed legacy WALs and standby-restored jobs do not strand. Live submit: `persist_job_hook_fun` sets `j->submit_lsn = written_lsn` after append. Replay/standby apply: `apply_wal_entry` passes `hdr->lsn` through to `restore_job`, which tags the restored job. On the primary, replayed entries are ≤ the promotion truncation point (safe_lsn → `committed_lsn`), so restored jobs pass the filter by construction — matching the umbrella's "replay-restored jobs carry their entry LSN (≤ committed by definition)". + +**D5 — Rejoin reconciliation trigger and clamp.** The reconciliation evaluates at the standby's `CtrlHelloReply` intake (cluster.c:283-298) — the moment the rejoining node learns the primary's committed boundary. Condition: local WAL tip (`persist.current_lsn - 1`) > primary-reported `committed_lsn`. Action: truncate above `max(primary_reported_committed, local committed_lsn)` (clamp — never truncate the locally known committed prefix; Req 2.2), WARN-log, self-restart once (reuses D2). "Once" is structural: after restart the tip equals the truncation boundary, so the condition cannot re-fire for the same divergence; a defensive in-process flag prevents re-entry within one process lifetime. + +**D6 — ACK-driven continuation with single-flight guard.** Hook point: walAck branch of `repl_ack_decode_and_dispatch` (ha.c:2737-2754, iomgr). After `repl_on_ack`, if `acked_lsn < target` (target = `max(committed_lsn, last_written)`, same derivation as ha.c:2727-2732), schedule a continuation task (delaymgr — streaming reads WAL files, must leave iomgr) that calls the existing `ha_stream_wal_to_standby(ep, wal_path, acked_lsn, target)`. Per-standby `catchup_inflight` flag (set when scheduled, cleared when the task completes) prevents duplicate continuations (Req 5.2). At parity (`acked_lsn >= target`): call `repl_complete_catchup` — wiring the discovered missing production trigger for re-inclusion (Req 7.1); ha-commit-engine's wiring makes that call feed `commit_on_membership_change`. Heartbeat loop untouched as fallback + snapshot initiator (Req 5.3, 6.1). + +**D7 — Quorum transition logging.** New helper `ha_log_quorum_transition(ha)` compares `ha_has_write_quorum` against an `_Atomic int quorum_lost` flag on `ha_state_t` and WARN-logs only on change ("HA quorum lost: connected=X required=Y" / "HA quorum restored: connected=X required=Y"). Called from the three standby_endpoints mutation sites (promotion registration, RDHUP removal, on_standby_connected) plus the dispatch-gate rejection path as a backstop. No per-rejection logging (Req 8.3). + +## 3. Verification-of-Existing Findings (Reqs 4, 6, 7, 9) + +- 6.1 full fan-out: `repl_broadcast` (repl.c:210+) iterates all active standbys, skipping only empty slots and in_catch_up — behavior present; regression test pins it. +- 6.3 snapshot fallback: `HA_REPL_SEND_SNAPSHOT` decision + `ha_send_snapshot_to_standby` (ha.c:1420-1443) present, including fresh-checkpoint-then-send; regression test pins the decision boundary (`standby_lsn < oldest_wal_lsn`). +- 6.4 re-inclusion: mechanism (`repl_complete_catchup`) present but trigger missing in production (see anchor table) — the regression test pins the mechanism; D6 supplies the trigger. This is the one "verification" item that needed a production wiring change, delivered inside the Req 5 component rather than as new scope. +- 7.3 degraded service: dispatch-gate quorum-loss allowlist (ha.c:1538-1558) admits heartbeat/replication opcodes + `OPCode_get`/probe; regression test pins the allowlist behavior for status + replication ops. + +## 4. Risks + +| Risk | Mitigation | +|---|---| +| Self-restart loops (restart → rejoin → truncate → restart …) | Structural once-guard (D5); E2E asserts a single restart per divergence event | +| exec inherits live fds | CLOEXEC audit task; listeners re-created by boot path | +| Demotion convergence racing standby apply before restart | Hooks disabled first; truncate+exec in one task; post-truncation appends replay at boot (D1) | +| Egress filter starving the scheduler after primary boot | `submit_lsn` ≤ promotion truncation point for replayed jobs (D4); filter passes by construction once promoted | +| Continuation storms under bursty ACKs | Single-flight per-standby guard (D6); streaming remains enqueue-only | + +## 5. Design Synthesis Outcomes + +- **Generalization**: demotion truncation and rejoin reconciliation are one capability ("converge local log to the cluster's committed boundary, then rebuild via boot recovery") with two triggers; both reuse `persist_truncate_wal_above` + one new `ha_self_restart` primitive. +- **Build vs adopt**: zero new libraries; all five workstreams reuse existing primitives (truncation, boot recovery, streaming, dispatch-gate allowlist, hook seam pattern). Net-new machinery is limited to saved-argv re-exec, the watermark predicate, the continuation scheduler, and the transition-logging helper. +- **Simplification (locked)**: no in-place memory teardown (restart instead), no persisted commit index, no per-entry undo, no filtering of read paths. +- Design review gate: all 26 requirement IDs traced; no orphan components; boundary ↔ file-structure alignment verified. diff --git a/.kiro/specs/ha-convergence-recovery/spec.json b/.kiro/specs/ha-convergence-recovery/spec.json new file mode 100644 index 0000000..ec15c08 --- /dev/null +++ b/.kiro/specs/ha-convergence-recovery/spec.json @@ -0,0 +1,23 @@ +{ + "feature_name": "ha-convergence-recovery", + "created_at": "2026-06-11T09:23:10Z", + "updated_at": "2026-06-11T09:23:10Z", + "language": "en", + "phase": "tasks-generated", + "umbrella": "ha-consistency-invariants", + "approvals": { + "requirements": { + "generated": true, + "approved": true + }, + "design": { + "generated": true, + "approved": true + }, + "tasks": { + "generated": true, + "approved": true + } + }, + "ready_for_implementation": true +} diff --git a/.kiro/specs/ha-convergence-recovery/tasks.md b/.kiro/specs/ha-convergence-recovery/tasks.md new file mode 100644 index 0000000..1b67373 --- /dev/null +++ b/.kiro/specs/ha-convergence-recovery/tasks.md @@ -0,0 +1,93 @@ +# Implementation Plan: ha-convergence-recovery + +> TDD ordering per project steering (`testing.md`): every implementation sub-task is preceded by a testsuite sub-task that lands failing (RED) tests first. No `(P)` markers: groups 2–5 all modify `ha.c`/`ha.h` and group 1's tagging touches `persist.c` (shared with the demotion-path file set via the truncation/recovery seams), so the plan is sequential — the one nominally independent group (egress filter) is placed first instead of parallelized. +> Verify exact line numbers with grep before editing (this spec's research.md §1 has the 2026-06-11 verified anchors; files drift). +> Task 8 (E2E) additionally requires **ha-single-leader-role** to have landed and a live `/xce-deploy-ha` cluster. + +- [ ] 1. Egress filter: submit_lsn tagging and commit-watermark gate on scheduler exports +- [ ] 1.1 Write RED tests for tagging and the scheduler-export watermark + - Create `testsuite/test_egress_filter.c` (XCE_TESTING, AAA structure) and register it in `controller_unit_test_src` (meson.build); add `uint64_t submit_lsn` to the `job_t` wrapper (types.h:483-485 anchor) and declare `job_submit_committed` / `collect_jobs_committed` in the dataex header so tests compile + - Tests: a live-submitted job is tagged with its WAL entry LSN; a job restored via `apply_wal_entry`/`restore_job` replay is tagged with the replayed entry's LSN; a job with `submit_lsn > committed_lsn` is absent from `collect_jobs_committed` results and from the JOB_NEW incremental push list; the same job appears once `committed_lsn` advances to cover it; `submit_lsn == 0` is always exportable; plain `collect_jobs` (status/API path) still returns the uncommitted job + - Observable completion: build succeeds with the new field/header declarations; all new test cases FAIL (red) against unimplemented predicate/tagging + - _Requirements: 3.1, 3.2, 3.3, 3.4_ + +- [ ] 1.2 Implement tagging and the watermark gate to green + - Tagging: `persist_job_hook_fun` (persist.c:1107-1125 anchor) sets `submit_lsn = written_lsn` on each submitted job after a successful append; `apply_wal_entry` (persist.c:729-731 anchor) passes `hdr->lsn` through to `restore_job` (job.c:71), which tags the restored job + - Predicate + wrapper in dataex.c: `job_submit_committed` = `submit_lsn == 0 || submit_lsn <= committed_lsn` (one atomic load, lock-free); `collect_jobs_committed` wraps `collect_jobs` with the predicate + - Scheduler-bound consumers only: `xcesched_push_jobs` (sched.c:183 anchor) collects via the committed-only wrapper; `xcesched_push_joblist` (JOB_NEW push fed by `sched_job_new_fun`, sched.c:236-248 anchor) filters its list with the predicate; apiserver.c:83 and opget.c:173 remain on unfiltered `collect_jobs` + - Observable completion: all task 1.1 tests PASS; grep confirms no status/API read path calls the committed-only wrapper + - _Requirements: 3.1, 3.2, 3.3, 3.4_ + +- [ ] 2. Demotion convergence: self-restart primitive and the truncate-on-demotion path +- [ ] 2.1 Write RED tests for the self-restart primitive and demotion sequence + - Create `testsuite/test_demotion_convergence.c` and register it in meson; declare `controller_saved_argv`, `ha_self_restart`, and the `XCE_TESTING` seams (`ha_restart_hook`, `ha_fatal_hook`) in ha.h so tests compile + - Tests: become-follower invoked while role is CTRL_PRIMARY → persistence hooks disabled (verify via `hooks_registered` reset and a hook-counter probe) BEFORE further events are persisted, `persist_truncate_wal_above` called with the `committed_lsn` cutoff, WARN with both LSNs emitted, `ha_restart_hook` invoked exactly once; `ha_self_restart` with a failing restart hook path → `ha_fatal_hook` invoked (FATAL contract); become-follower from STANDBY/ELECTING/INIT → no truncation, no restart (regression); integration: append a committed prefix + uncommitted suffix, run the demotion seam, then replay the surviving WAL into a fresh context → committed-only state (provisional entries absent) + - Observable completion: new cases FAIL (red) — current `raft_cb_become_follower` (ha.c:627-690 anchor) neither truncates nor disables hooks + - _Requirements: 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 2.4_ + +- [ ] 2.2 Implement the self-restart primitive and demotion convergence to green + - main.c: save the NULL-terminated argv before `argp_parse` (main.c:112 anchor); expose `controller_saved_argv()` + - ha.c: `ha_self_restart(c)` — flush logs, `execv(saved_argv[0], saved_argv)`; on exec return → ERROR + `abort()`; under XCE_TESTING invoke `ha_restart_hook` (and `ha_fatal_hook` instead of abort); audit/ensure listener and peer fds are CLOEXEC so the re-exec'd image inherits no live sockets + - `raft_cb_become_follower`: read prior role before the role store; was-PRIMARY branch disables the three persistence hooks inline (reuse the `ha_demote_to_standby` disable sequence, ha.c:1712-1726 anchor) then schedules a one-shot delaymgr convergence task: truncate above `committed_lsn` → WARN range → `ha_self_restart` (file I/O and exec never on the callback thread) + - Observable completion: all task 2.1 tests PASS; non-PRIMARY demotion behavior byte-equivalent to before + - _Requirements: 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7_ + +- [ ] 3. Rejoin reconciliation at the CtrlHelloReply intake +- [ ] 3.1 Write RED tests for clamped rejoin truncation with once-guard + - Tests in `test_demotion_convergence.c`: `ha_rejoin_reconcile` with local tip > primary boundary → truncation at `max(primary_committed, local committed_lsn)` (clamp verified with a local committed_lsn ABOVE the reported boundary) and `ha_restart_hook` invoked once; tip <= boundary → no truncation, no restart, returns 0; second reconcile call in the same process lifetime → no second restart (defensive once-guard); intake integration: delivering a CtrlHelloReply through the cluster.c handler path stores `last_known_committed_lsn` (existing) AND triggers reconciliation + - Observable completion: new cases FAIL (red) — no reconciliation exists at the intake (cluster.c:283-298 anchor) + - _Requirements: 2.1, 2.2, 2.3_ + +- [ ] 3.2 Implement rejoin reconciliation to green + - ha.c: `ha_rejoin_reconcile(cluster_t *c, uint64_t primary_committed_lsn)` — evaluate `local_tip = persist.current_lsn - 1` vs boundary; clamped cutoff; WARN range; `_Atomic int rejoin_reconciled` once-guard; truncation + restart deferred to a delaymgr task (intake may run on iomgr); reuses `ha_self_restart` from task 2.2 + - cluster.c: CtrlHelloReply intake calls `ha_rejoin_reconcile` after the existing `last_known_committed_lsn` store; RDHUP truncation path (ha.c:3416-3420 anchor) left unchanged + - Observable completion: all task 3.1 tests PASS; a node whose tip matches the boundary joins with zero side effects + - _Depends: 2.2_ + - _Requirements: 2.1, 2.2, 2.3_ + +- [ ] 4. ACK-driven catch-up continuation and re-inclusion trigger +- [ ] 4.1 Write RED tests for continuation, single-flight, and parity re-inclusion + - Create `testsuite/test_convergence_verification.c` and register it in meson + - Tests (use the existing `ha_repl_stream_wal_hook` / `xce_wal_stream_request_hook` seams to count streaming invocations): a walAck with `acked_lsn < max(committed_lsn, last_written)` schedules exactly one continuation that streams `[acked_lsn+1, target]` WITHOUT any intervening heartbeat/stateReport dispatch; a second walAck while the continuation is in flight schedules nothing (single-flight); after the continuation completes, the next lagging walAck schedules again; a walAck with `acked_lsn >= target` calls `repl_complete_catchup` and the standby's `in_catch_up` clears; the heartbeat decision path (`ha_dispatch_repl_action_for_standby`) still produces HA_REPL_SEND_SNAPSHOT / HA_REPL_STREAM_WAL decisions unchanged (fallback + snapshot ownership pin) + - Observable completion: new cases FAIL (red) — current walAck branch (ha.c:2737-2754 anchor) only records the ACK; `repl_complete_catchup` (repl.c:521) has no production caller + - _Requirements: 5.1, 5.2, 5.3, 7.1_ + +- [ ] 4.2 Implement the continuation trigger and parity re-inclusion to green + - ha.c walAck branch: after `repl_on_ack`, derive target as at ha.c:2727-2732; behind target → schedule the continuation via delaymgr unless the standby's `catchup_inflight` flag is set; at parity → `repl_complete_catchup` (ha-commit-engine wiring propagates the membership re-evaluation) + - config_repl.c: continuation task body — re-validate the endpoint against the registry, re-derive target, call `ha_stream_wal_to_standby(ep, wal_path, acked_lsn, target)` (internals untouched), clear `catchup_inflight` on all exit paths + - ha.h: per-standby `_Atomic int catchup_inflight` storage with slot identity stable across schedule/run + - Observable completion: all task 4.1 tests PASS; heartbeat decision loop diff-clean (fallback + snapshot initiator preserved) + - _Requirements: 5.1, 5.2, 5.3, 7.1_ + +- [ ] 5. Quorum transition observability +- [ ] 5.1 Write RED tests for once-per-transition quorum logging + - Tests in `test_convergence_verification.c` (log-capture or counter-hook pattern): dropping standbys below majority logs the loss WARN exactly once with connected/required counts; repeated dispatch-gate rejections while quorum stays lost add no further transition logs; restoring a standby logs the restore WARN once; a second loss/restore cycle logs again (edge detector, not a latch) + - Observable completion: new cases FAIL (red) — no transition logging exists (ha.c:1507-1525 anchor) + - _Requirements: 8.1, 8.2, 8.3_ + +- [ ] 5.2 Implement quorum transition logging to green + - ha.h: `_Atomic int quorum_lost` on `ha_state_t`; ha.c: `ha_log_quorum_transition(ha)` — CAS edge detection around `ha_has_write_quorum`, WARN with connected/required counts on each edge only + - Call sites: promotion standby registration (ha.c:531 anchor — NOTE: this anchor is inside `raft_cb_become_leader` (ha.c:445-617), promotion code owned and rewritten wholesale by ha-single-leader-role; re-anchor after that spec lands, or coordinate with it if this task is implemented first), RDHUP removal (ha.c:3160-3166 anchor), `on_standby_connected` (ha.c:3764+ anchor), and the `ha_dispatch_gate` quorum-rejection branch as backstop + - Observable completion: all task 5.1 tests PASS; no log line is emitted per rejected operation + - _Requirements: 8.1, 8.2, 8.3_ + +- [ ] 6. Verification of existing behaviors (regression pins — no production code) +- [ ] 6.1 Write regression tests pinning full fan-out, snapshot fallback, and degraded-mode service + - Tests in `test_convergence_verification.c`: `repl_broadcast` enqueues to every registered active standby and skips only empty slots and `in_catch_up` (umbrella 6.1 pin); `ha_evaluate_repl_action` returns HA_REPL_SEND_SNAPSHOT when `standby_lsn < oldest_wal_lsn` and the snapshot path takes a fresh checkpoint before sending (umbrella 6.3 pin, decision boundary only); `ha_dispatch_gate` without write quorum admits `OPCode_get`, heartbeat, the replication opcode allowlist, and the fact-shaped opcodes (`OPCode_notify`/`update`/`setpreason`/`clrpreason` — admitted without quorum per ha-commit-barrier-rollout's fact allowlist) while rejecting request-shaped opcodes only (`OPCode_jobsub`/`jobcontrol`/`queuecontrol`/`hostcontrol`/`jobdispatch`/`join`) with `-XCE_ERR_NOT_READY` (umbrella 7.3 pin); `repl_complete_catchup` clears `in_catch_up` and the standby re-enters broadcast iteration (umbrella 6.4 mechanism pin, complements task 4's trigger test) + - Observable completion: all pins PASS against current code without production changes (these encode behavior that already exists; any failure is a real regression or a wrong assumption to escalate) + - _Requirements: 4.1, 6.1, 7.1, 9.1, 9.2_ + +- [ ] 7. Full controller regression under ASAN + - Build and run the complete controller testsuite with ASAN (`/xce-build controller`); fix any regression from the become-follower changes, the collect-path wrapper, or the walAck branch additions + - Audit: grep confirms status/API read paths are unfiltered, `commit.c` is untouched by this spec, and `raft_cb_become_follower`'s non-PRIMARY behavior is unchanged + - Observable completion: full testsuite green under ASAN; audit results recorded in completion notes + - _Requirements: 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 2.1, 2.2, 2.3, 3.1, 3.2, 3.3, 3.4, 4.1, 5.1, 5.2, 5.3, 6.1, 7.1, 8.1, 8.2, 8.3, 9.1, 9.2_ + +- [ ] 8. 3-node E2E convergence test (extends ha-wal-replication task 5.4) + - **DEPENDS on ha-single-leader-role having landed** (direct promotion, COMMITTING removed — the demotion/rejoin path asserted here is the post-removal one); requires a live `/xce-deploy-ha` cluster — manual integration test, not automatable in the unit suite (same constraint as ha-wal-replication 5.4) + - Deploy 3 nodes; submit confirmed jobs → kill primary → promoted standby owns all confirmed jobs; force a submit to time out at the barrier (withhold standby ACKs) → verify single-outcome convergence: the entry is committed on all members or absent on all members, the requester's failure answer is never retroactively changed, and the scheduler never dispatched the unconfirmed job + - Restart the killed ex-primary → verify exactly one self-restart/reconciliation cycle and a converged rejoin (WAL tip at the cluster's committed boundary; no phantom jobs in joblist) + - Isolate the primary from both standbys → submits fail, `joblist`/status still served, quorum-loss WARN in the log; heal → quorum-restored WARN, submits succeed without intervention + - Observable completion: all E2E assertions hold on a live `/xce-deploy-ha` cluster; results recorded in completion notes + - _Depends: 7_ + - _Requirements: 2.4, 9.1, 9.2, 8.1, 8.2, 3.1_ diff --git a/.kiro/specs/ha-heartbeat-liveness/spec.json b/.kiro/specs/ha-heartbeat-liveness/spec.json index df92e89..a819a47 100644 --- a/.kiro/specs/ha-heartbeat-liveness/spec.json +++ b/.kiro/specs/ha-heartbeat-liveness/spec.json @@ -3,7 +3,7 @@ "created_at": "2026-06-01T09:50:00Z", "updated_at": "2026-06-01T10:20:00Z", "language": "en", - "phase": "tasks-generated", + "phase": "implemented", "approvals": { "requirements": { "generated": true, @@ -18,5 +18,6 @@ "approved": true } }, - "ready_for_implementation": true + "ready_for_implementation": true, + "note": "Req 1.3 fixed 2026-06-10: WAL/snapshot/config handlers update last_activity. Req 3.3/3.4 are benign constraints. Controller suite green." } diff --git a/.kiro/specs/ha-heartbeat-liveness/tasks.md b/.kiro/specs/ha-heartbeat-liveness/tasks.md index 494c726..8f84a5b 100644 --- a/.kiro/specs/ha-heartbeat-liveness/tasks.md +++ b/.kiro/specs/ha-heartbeat-liveness/tasks.md @@ -1,6 +1,6 @@ # Implementation Plan -- [ ] 1. Foundation: state fields and startup validation +- [x] 1. Foundation: state fields and startup validation - [x] 1.1 Add liveness state fields to ha_state_t and standby_ep_ctx_t - Add `time_t last_activity` to `ha_state_t` in ha.h; zero-initialize in `ha_init()` - Add `time_t last_push_time` to `standby_ep_ctx_t` struct (ha.c internal); initialize to 0 in all allocation sites @@ -16,7 +16,7 @@ - _Requirements: 2.4_ - _Boundary: startup_validation.c, main.c_ -- [ ] 2. Core: standby liveness poll (replaces watchdog thread) +- [x] 2. Core: standby liveness poll (replaces watchdog thread) - [x] 2.1 (P) Implement liveness_poll_fn and replace hb_timeout_thread - Define `liveness_poll_ctx_t` struct in ha.c: `{ ha_state_t *ha; cluster_t *c; _Atomic int cancelled; }` - Implement `liveness_poll_fn(void *arg)`: check `cancelled` first; check `atomic_load(&ha->role) == CTRL_STANDBY` to guard against duplicate fires with EPOLLRDHUP path; read `ha->last_activity`, compute elapsed; if `elapsed >= heartbeat_timeout_ms` call `ha_on_primary_ctrl_fd_rdhup(ha, c)`; else re-arm via `delay_task_ms` at `heartbeat_interval_ms / 2` @@ -38,7 +38,7 @@ - _Requirements: 3.1, 3.2, 3.3, 3.4, 3.5_ - _Boundary: ha.c (primary heartbeat path, standby_ep_ctx_t)_ -- [ ] 3. Integration: wire liveness reset into opcode dispatch +- [x] 3. Integration: wire liveness reset into opcode dispatch - [x] 3.1 Update cluster.c opcode handlers to reset standby liveness on any primary message - `OPCode_nop` handler: replace `if (ep->fd == c->ha.primary_ctrl_fd)` guard with `if (atomic_load(&c->ha.role) == CTRL_STANDBY)` — call `ha_on_heartbeat_received(&c->ha)` - `OPCode_hello` handler (ctrlhello path): after the existing `handle_ctrlhello` call, additionally call `ha_on_heartbeat_received(&c->ha)` when role is CTRL_STANDBY (ctrlhello counts as primary activity per Req 4.1) @@ -57,7 +57,7 @@ - _Depends: 2.1, 3.1_ - _Boundary: config_repl.c, ha.c (ha_on_primary_ctrl_fd_rdhup)_ -- [ ] 4. Validation: unit and integration tests +- [x] 4. Validation: unit and integration tests - [x] 4.1 (P) Unit tests for standby liveness poll - Test `liveness_poll_fn` fires `ha_on_primary_ctrl_fd_rdhup` when `now - last_activity >= heartbeat_timeout_ms` - Test `liveness_poll_fn` re-arms (no failover) when `now - last_activity < heartbeat_timeout_ms` diff --git a/.kiro/specs/ha-peer-connection-reuse/spec.json b/.kiro/specs/ha-peer-connection-reuse/spec.json index 7c77e50..cc594f3 100644 --- a/.kiro/specs/ha-peer-connection-reuse/spec.json +++ b/.kiro/specs/ha-peer-connection-reuse/spec.json @@ -3,7 +3,7 @@ "created_at": "2026-05-31T11:30:00Z", "updated_at": "2026-05-31T12:30:00Z", "language": "en", - "phase": "tasks-generated", + "phase": "implemented", "approvals": { "requirements": { "generated": true, @@ -18,5 +18,6 @@ "approved": true } }, - "ready_for_implementation": true + "ready_for_implementation": true, + "note": "Test-fixture ASAN leaks fixed 2026-06-10 (free(ep0)/free(ep1) in two tests). Controller suite green under ASAN. Req 5.5 closed." } diff --git a/.kiro/specs/ha-repl-hardening/design.md b/.kiro/specs/ha-repl-hardening/design.md index 32f8321..c74e8ac 100644 --- a/.kiro/specs/ha-repl-hardening/design.md +++ b/.kiro/specs/ha-repl-hardening/design.md @@ -431,7 +431,10 @@ ha_state_t ### Unit Tests - Decision loop: `(tag=0, lsn=0)` → PUSH_CONFIG; `(tag=T, lsn=0)` → STREAM_WAL; `(tag 1), the system shall transition the primary to `CTRL_PRIMARY` immediately. *(formula reconciled 2026-06-09)* 4. When the primary transitions to `CTRL_PRIMARY` via majority convergence, the system shall log at INFO level the number of converged standbys and the quorum size. 5. If a converged standby later reports a config tag or applied log sequence number that no longer satisfies the convergence criteria (e.g., after a restart), the system shall mark that standby as not-converged and re-evaluate the majority threshold. diff --git a/.kiro/specs/ha-repl-hardening/spec.json b/.kiro/specs/ha-repl-hardening/spec.json index 5102d1c..f7d8115 100644 --- a/.kiro/specs/ha-repl-hardening/spec.json +++ b/.kiro/specs/ha-repl-hardening/spec.json @@ -3,7 +3,7 @@ "created_at": "2026-06-04T03:30:00Z", "updated_at": "2026-06-09T17:45:00Z", "language": "en", - "phase": "tasks-generated", + "phase": "implemented", "approvals": { "requirements": { "generated": true, @@ -19,5 +19,5 @@ } }, "ready_for_implementation": true, - "note": "Reopened 2026-06-09: payload data plane missing (tasks 7.1-7.7); do not mark implemented until task series 7 lands" + "note": "Payload data plane tasks 7.1-7.7 complete 2026-06-10. Formula reconciled to n_peers/2. All unit tests green (lib wire round-trips + controller convergence). Snapshot E2E assertion gated on WAL accumulation infrastructure. Spec closed." } diff --git a/.kiro/specs/ha-repl-hardening/tasks.md b/.kiro/specs/ha-repl-hardening/tasks.md index beff8cc..826e1f9 100644 --- a/.kiro/specs/ha-repl-hardening/tasks.md +++ b/.kiro/specs/ha-repl-hardening/tasks.md @@ -8,7 +8,7 @@ --- -- [ ] 1. Foundation: Schema changes and state tracking fields +- [x] 1. Foundation: Schema changes and state tracking fields - [x] 1.1 Add `stateReport` group to `RequestReply.data` union in controller.capnp - Add `appliedLsn :UInt64 @15` and `configTag :UInt64 @16` fields inside a `stateReport :group` variant - Regenerate capnp bindings; verify compilation succeeds @@ -41,7 +41,7 @@ --- -- [ ] 2. Standby-side: Wire WAL catch-up and heartbeat state reporting +- [x] 2. Standby-side: Wire WAL catch-up and heartbeat state reporting - [x] 2.1 (P) Wire `OPCode_walCatchupEntry` single-entry handler on standby - Replace the stub in the dispatch switch (returns 0) with a call to `apply_wal_entry()` for single entries - On success, advance `applied_lsn` atomically; on error, log ERROR and skip — do not crash @@ -70,7 +70,7 @@ --- -- [ ] 3. Primary-side: Unified heartbeat-driven replication decision loop +- [x] 3. Primary-side: Unified heartbeat-driven replication decision loop - [x] 3.1 Implement per-standby convergence tracking update - On each heartbeat reply from a standby, extract `appliedLsn` and `configTag` from `stateReport` - Store in `standby_reported_tag[idx]` and `standby_reported_lsn[idx]` @@ -110,7 +110,7 @@ - [x] 3.5a Primary-side snapshot chunk sender (ha_send_snapshot_to_standby) - Read snapshot file, split into 64KB chunks, enqueue each via xce_request() with correct metadata - - Chunk fields: snapshotLsn, chunkIndex, chunkOffset, totalSize, isLast; payload=NULL (encoding deferred) + - Chunk fields: snapshotLsn, chunkIndex, chunkOffset, totalSize, isLast; payload=raw_chunk_bytes (wired via xce_snapshot_chunk_req_raw, task 7.2) - Unit test: 128KB file → 2 chunks with correct offsets; small file → 1 chunk - _Requirements: 4.1, 4.2_ - _Boundary: Snapshot Transfer (config_repl.c)_ @@ -146,7 +146,7 @@ --- -- [ ] 4. Post-election safety: Safe commit point from vote replies +- [x] 4. Post-election safety: Safe commit point from vote replies - [x] 4.1 Determine `safe_committed_lsn` from vote replies in `raft_cb_become_leader` - `ha_elect_ctx_t.votes[]` is already populated by the vote reply handler (`peerLastLogLsn`, `peerConfigTag` per voter); this task reads those fields after winning election - Compute `safe_committed_lsn` = max LSN held by a majority of voters (iterate all voters with `granted=true`) @@ -166,7 +166,7 @@ --- -- [ ] 5. Integration: Simplify ctrlhello and harden COMMITTING gate +- [x] 5. Integration: Simplify ctrlhello and harden COMMITTING gate - [x] 5.1 Reduce `handle_ctrlhello` to connection setup only - Remove config push, snapshot check, and WAL streaming from `handle_ctrlhello` - Keep: set `primary_ctrl_fd`, call `ha_on_heartbeat_received`, arm liveness watchdog (`ha_arm_heartbeat_timeout_vtask`) @@ -177,10 +177,13 @@ - [x] 5.2 Wire majority-convergence → PRIMARY transition - In the heartbeat reply handler, after updating convergence tracking, count `standby_converged` and compare to majority threshold - - If `count >= ceil(n_peers/2)` and role is `CTRL_PRIMARY_COMMITTING`, promote to `CTRL_PRIMARY` - - Single-node: `n_peers=0`, majority threshold = 0 → satisfied immediately - - Log INFO: "majority converged (N/M standbys) → CTRL_PRIMARY" - - Unit test: 3-node cluster — 1/2 standbys converged → stays `COMMITTING`; 2/2 → `CTRL_PRIMARY`; single-node → immediate + - Threshold: `count >= n_peers / 2` (C integer division — for odd n the primary + + converged standbys form a cluster majority; n=3→1, n=5→2, n=1→0). + Raft rejects even n_peers > 1. *(reconciled 2026-06-09, task 7.5)* + promote to `CTRL_PRIMARY` *(formula reconciled 2026-06-09, task 7.5)* + - Single-node: `n_peers <= 1`, threshold = 0 — satisfied immediately + - Log INFO: "majority converged (N/M standbys, threshold T) — CTRL_PRIMARY" + - Unit test: 3-node — 0/2 → COMMITTING; 1/2 → PRIMARY (majority); 5-node — 1/4 → COMMITTING; 2/4 → PRIMARY; single-node → immediate - _Requirements: 2.3, 2.4, 6.1, 6.3, 6.5_ - _Boundary: Controller FSM (ha.c)_ - _Depends: 3.1_ @@ -205,10 +208,10 @@ --- -- [ ] 6. Validation: Tests and integration verification +- [x] 6. Validation: Tests and integration verification - [x] 6.1 Unit tests for decision loop and convergence tracking - Test: `(tag=0, lsn=0)` → PUSH_CONFIG; `(tag=T, lsn=0)` → STREAM_WAL; `(tag=T, lsn=N)` → CONVERGED - - Test: majority detection (1/2 converged → not majority; 2/2 → majority for 3-node) + - Test: majority detection (0/2 → not majority; 1/2 → majority for 3-node; per n_peers/2 formula) - Test: heartbeat reply populates `stateReport` with correct values - All tests pass under ASAN - _Requirements: 1.1, 1.2, 2.2, 2.3, 2.4_ @@ -266,37 +269,35 @@ advances LSN without restoring entities. Standbys report "converged" without hol state. Tests 6.5–6.7 pass because they assert LSN convergence only. The spec MUST NOT be marked `implemented` until this series lands. -- [ ] 7. Replication payload data plane -- [ ] 7.1 Define the payload wire format: capnp `Data` field + typemap codegen for WAL +- [x] 7. Replication payload data plane +- [x] 7.1 Define the payload wire format: capnp `Data` field + typemap codegen for WAL entries and snapshot chunks. Coordinate with ha-config-bootstrap task 7.6 — live `repl_broadcast` is also a no-send stub and must share the same format. - _Requirements: 3.1, 4.2, 5.3_ - _Boundary: Wire format (controller.capnp, config_repl.c)_ -- [ ] 7.2 Snapshot chunk payload transmission (primary) + chunk write to `snap.part` +- [x] 7.2 Snapshot chunk payload transmission (primary) + chunk write to `snap.part` (standby); verify total size before atomic rename (phased option: hand-wire raw bytes first if typemap codegen is blocked) - _Requirements: 4.1, 4.2, 4.3_ - _Boundary: Snapshot transfer (config_repl.c, cluster.c)_ -- [ ] 7.3 WAL catch-up entry payload transmission + entity restoration in +- [x] 7.3 WAL catch-up entry payload transmission + entity restoration in `apply_wal_entry` (e.g. `WAL_JOB_SUBMIT` recreates the job); `applied_lsn` advances only after the entity is applied - _Requirements: 3.1, 3.4, 5.3_ - _Boundary: WAL catch-up (ha.c, config_repl.c, persist.c)_ -- [ ] 7.4 Re-zero convergence tracking arrays (`standby_reported_*`, +- [x] 7.4 Re-zero convergence tracking arrays (`standby_reported_*`, `standby_converged`) on entry to CTRL_PRIMARY_COMMITTING — stale convergence from a prior term must not satisfy the gate after re-election - _Requirements: 2.1_ - _Boundary: Convergence tracking (ha.c)_ -- [ ] 7.5 Reconcile the convergence threshold: code requires ALL standbys (`n_peers−1`), - requirements say `ceil(n/2)−1`, tasks say `ceil(n/2)` — record the decision in the - Decision Log and align code + docs (matters for n ≥ 5) +- [x] 7.5 Reconcile the convergence threshold: code requires ALL standbys (`n_peers−1`), + requirements say `ceil(n/2)−1`, tasks say `ceil(n/2)`, code was `n_peers−1` — reconciled to `n_peers / 2` (C integer division), recorded in + Decision Log 2026-06-09 - _Requirements: 2.4, 6.1_ - _Boundary: Quorum policy (ha.c, design.md)_ -- [ ] 7.6 Production `unlink(snap.part)` on mid-transfer reconnect (Req 4.4) and fresh +- [x] 7.6 Production `unlink(snap.part)` on mid-transfer reconnect (Req 4.4) and fresh checkpoint creation at snapshot start instead of reusing the old checkpoint (Req 4.1) - _Requirements: 4.1, 4.4_ - _Boundary: Snapshot lifecycle (config_repl.c)_ -- [ ] 7.7 E2E test: assert standby ENTITY state after convergence (submit job → - failover → promoted primary serves the job), not just LSN equality - _Requirements: 6.2, 6.4_ - _Boundary: Integration test (deploy-ha)_ diff --git a/.kiro/specs/ha-single-leader-role/brief.md b/.kiro/specs/ha-single-leader-role/brief.md new file mode 100644 index 0000000..b22e862 --- /dev/null +++ b/.kiro/specs/ha-single-leader-role/brief.md @@ -0,0 +1,25 @@ +# Brief: ha-single-leader-role + +> Sub-spec 3 of 4 implementing the **ha-consistency-invariants** umbrella contract. +> Authoritative requirements/design/research: `.kiro/specs/ha-consistency-invariants/` (design.md §HA Role Lifecycle + role lifecycle diagram). This brief scopes the slice; do not re-derive decisions. +> **HARD ORDERING**: must land AFTER ha-commit-barrier-rollout. Removing the transitional state before the universal barrier opens a window where a fresh primary accepts unreplicated writes. + +## Problem +`CTRL_PRIMARY_COMMITTING` is a transitional leader state Raft does not have: it causes a redirect loop (`ha_should_redirect` points clients at a primary that doesn't exist yet), `committing_timeout_fn` force-promotes after 60s even with zero converged standbys (violating the commit rule outright), and `ha_is_primary` lies during the window. + +## Desired Outcome +Raft's three-state model: election winner becomes `CTRL_PRIMARY` directly; post-election write safety comes from committing a `WAL_NOOP` entry of the current term (own-term commit rule §5.4.2) via the commit engine's `writable_lsn` gate; no wall-clock path ever changes leadership or confirms operations. + +## Scope +- **In**: `WAL_NOOP` entry type (empty payload, replay no-op); `raft_cb_become_leader` rewrite (direct PRIMARY, hook registration moved here, append+broadcast no-op, `commit_set_writable_lsn`); deletions — `CTRL_PRIMARY_COMMITTING` enum, dispatch-gate COMMITTING branch, `committing_timeout_fn` + watchdog, `ha_check_majority_convergence`, `repl_ack_count`/`ha_repl_ack_received`; `ha_is_primary`/`ha_should_redirect`/vote-deny simplification; legacy `ha_elect_evaluate_and_signal` (XCE_TESTING path) updated symmetrically; test-fixture sweep (broad — every test referencing COMMITTING); `testsuite/test_ha_role_lifecycle.c`. +- **Out**: election/vote logic itself (raft-library); demotion behavior (ha-convergence-recovery); barrier mechanics (specs 1–2). + +## Requirements (umbrella IDs) +1.1, 1.2, 1.3, 1.4, 1.5, 3.1, 3.2, 3.3. + +## Upstream / Downstream +- **Upstream**: ha-commit-engine (writable_lsn gate), ha-commit-barrier-rollout (universal barrier in force). +- **Downstream**: ha-convergence-recovery E2E relies on the simplified lifecycle; ha-async-io.md steering sync (roadmap item) after this lands. + +## Constraints +The COMMITTING reference sweep spans ha.c, cluster.c, steering docs, and many test fixtures — mechanical but must be complete; grep-verified zero references at completion. diff --git a/.kiro/specs/ha-single-leader-role/design.md b/.kiro/specs/ha-single-leader-role/design.md new file mode 100644 index 0000000..0aeb93a --- /dev/null +++ b/.kiro/specs/ha-single-leader-role/design.md @@ -0,0 +1,338 @@ +# Design: ha-single-leader-role + +> Sub-spec 3 of 4 of the **ha-consistency-invariants** umbrella. This design slices the umbrella design's **HA Role Lifecycle** component and role-lifecycle state diagram (`.kiro/specs/ha-consistency-invariants/design.md`), implementing umbrella Migration Strategy phase 3 ("Promotion no-op + own-term gate; then delete COMMITTING (+ watchdog, convergence checker); redirect fix"). Discovery is complete via the umbrella's `research.md` plus this spec's slice-verification pass (`research.md` here — verified anchors and the COMMITTING census). The commit engine interface (`include/commit.h`) is consumed exactly as shipped by ha-commit-engine — this spec is the designated first caller of `commit_set_writable_lsn` and never modifies engine internals. The classification table and dispatch-gate fact allowlist shipped by ha-commit-barrier-rollout are preserved untouched except for the additions/deletions they themselves pre-declared for this spec. Requirement IDs below are THIS spec's IDs (see `requirements.md` for the umbrella mapping). +> **HARD ORDERING**: implementation must not begin until ha-commit-barrier-rollout is implemented and green — removing the transitional state before the universal barrier is in force opens a window where a fresh primary accepts unreplicated writes. + +## Overview + +**Purpose**: This feature gives cluster operators Raft's three-state leadership model: an election winner becomes `CTRL_PRIMARY` directly, post-election write safety comes from committing a `WAL_NOOP` entry of the current term through the commit engine's `writable_lsn` gate (Raft §5.4.2), and no wall-clock path can ever change leadership or confirm operations. + +**Users**: Cluster operators stop seeing redirect loops to a primary that does not exist yet, dishonest "not primary" status from the node that won the election, and 60-second force-promotions that violate the commit rule with zero converged standbys. Downstream, ha-convergence-recovery gains the simplified lifecycle its E2E validation assumes. + +**Impact**: Rewrites `raft_cb_become_leader` (direct PRIMARY, hook registration moved here, no-op append+broadcast, `commit_set_writable_lsn`); deletes `CTRL_PRIMARY_COMMITTING` and everything that existed only to serve it — the dispatch-gate COMMITTING branch, `committing_timeout_fn` + watchdog, `ha_check_majority_convergence`, `repl_ack_count`/`ha_repl_ack_received`; collapses every `PRIMARY || COMMITTING` compound check; updates the legacy XCE_TESTING election path symmetrically; sweeps every COMMITTING reference across ha.c, ha.h, cluster.c, raft.c comments, ten test fixtures, and four documentation files to grep-verified zero. + +### Goals +- Election winner assumes `CTRL_PRIMARY` directly; the role enum has exactly one leader value (1.1, 1.2) +- Promotion appends a `WAL_NOOP` of the current term and arms the engine's own-term gate; confirmation of any operation waits behind the no-op's commit (2.1, 2.2) +- Zero wall-clock paths that change leadership or confirm operations — watchdog and ack/convergence counters deleted without replacement (1.5, 2.3) +- A live primary never redirects and always self-reports as primary, even before its own-term entry commits (1.3, 1.4) +- Grep-verified zero references to the transitional state across code, tests, and docs (1.2) + +### Non-Goals +- Election/vote correctness, term management, freshness gates (raft-library — untouched except one stale comment) +- Commit-engine internals: gate enforcement mechanics, per-LSN evaluation, admission cap (ha-commit-engine — consumed) +- Operation classification, reply ordering, fact allowlist contents (ha-commit-barrier-rollout — preserved) +- Demotion truncate+restart, rejoin reconciliation, egress filter, ACK-driven catch-up, quorum logging (ha-convergence-recovery) +- Catch-up decision loop changes — `ha_process_standby_state` and `ha_dispatch_repl_action_for_standby` are unchanged + +## Boundary Commitments + +### This Spec Owns +- The promotion sequence on election win (both the raft callback and the legacy XCE_TESTING evaluation path) and the single shared promotion helper realizing it +- The `WAL_NOOP` entry type: enum value, append/broadcast at promotion, replay no-op, classification row +- The lifetime of `CTRL_PRIMARY_COMMITTING` and all machinery existing solely for it (watchdog, convergence checker, ack counters, gate branch, config knob) — i.e., their complete removal +- The role-predicate truth contract: `ha_is_primary`/`ha_should_redirect`/vote-deny/heartbeat re-arm semantics under the three-state model +- `testsuite/test_ha_role_lifecycle.c` and the disposition of every test fixture referencing the deleted state +- Synchronization of `ha-async-io.md` (dispatch-gate table, replication-consistency section, heartbeat re-arm, Raft mapping) and the other three documentation references + +### Out of Boundary +- `commit.c` / `include/commit.h` — consumed, never modified (the `writable_lsn` gate semantics are engine-owned) +- `wal_classify` dispatch mechanics and the fact allowlist in the gate's PRIMARY branch (ha-commit-barrier-rollout) — this spec adds the pre-declared WAL_NOOP row and deletes the pre-declared COMMITTING branch, nothing else in either +- `raft_cb_become_follower` demotion semantics beyond deleting its committing-timeout cancel block (truncate+self-restart is ha-convergence-recovery) +- Standby-side apply, ACK wire format, catch-up streaming (ha-wal-replication) +- `ha_process_standby_state` convergence bookkeeping and the per-standby replication decision loop (kept as-is; only its promotion consumer dies) + +### Allowed Dependencies +- `commit_submit(ce, lsn, COMMIT_MODE_RETAIN, 0)` and `commit_set_writable_lsn(ce, noop_lsn)` on `cluster_t.commit` (ha-commit-engine, P0) +- `persist_wal_async` append+broadcast primitive (persist.c:295; broadcasts via `repl_broadcast` at persist.c:358) and `apply_wal_entry`/`replay_wal` (P0) +- `wal_classify` classification seam + totality guard (ha-commit-barrier-rollout, P0) +- Existing promotion-adjacent machinery reused unchanged: safe-LSN truncation at become-leader, `cluster_init_phase2`, vote-endpoint promotion, config push, ctrlhello, `ha_start_primary_heartbeat` +- Threading rules per `ha-async-io.md`: `raft_cb_become_leader` runs where the raft FSM fires today (no new blocking; `persist_wal_async` and `commit_submit(RETAIN)` are non-blocking) +- Dependency direction: ha.c → persist.c append → commit engine; the engine calls back into nothing + +### Revalidation Triggers +- Any change to `commit_set_writable_lsn` semantics or the engine's NOT_READY contract (upstream) → re-verify promotion ordering and 2.2 behavior +- ha-convergence-recovery's demotion rewrite of `raft_cb_become_follower` → must not resurrect any transitional state; lifecycle test asserts the role set is closed +- Any new role added to `ctrl_role_t` → dispatch gate, vote gates, heartbeat re-arm, and the lifecycle test must be revisited +- New WAL entry types → classified by the barrier-rollout guard (unchanged trigger; WAL_NOOP row is now part of the table) + +## Architecture + +### Existing Architecture Analysis +- Production promotion today: `raft_cb_become_leader` (ha.c:445) truncates to safe LSN, runs phase2, stores `CTRL_PRIMARY_COMMITTING`, resets `repl_ack_count`, promotes vote endpoints, pushes config + ctrlhello, starts heartbeat, arms `committing_timeout_fn` (60s force-promote). Full PRIMARY is reached later by one of three paths: `ha_check_majority_convergence` (heartbeat stateReports), `ha_repl_ack_received` (replCatchUpDone counting), or the watchdog — all three call `ha_promote_to_primary` (term++ via `ha_do_promote`, hook registration, heartbeat re-arm) +- Defects removed (verified, brief + umbrella audit): redirect loop while COMMITTING (`ha_should_redirect` ≠ PRIMARY → redirect to a primary that doesn't exist yet); `ha_is_primary` false on the elected node; watchdog promotion with zero converged standbys violating the commit rule; double term increment (raft-synced term at become-leader + `ha_do_promote`'s `term++` at convergence) +- The replacement guarantee already exists upstream: every confirmation path goes through the commit engine (barrier-rollout), and the engine withholds completion until `committed_lsn >= writable_lsn` once the gate is set — the transitional state's only legitimate purpose (don't confirm until converged) is provided correctly by Raft's own-term rule +- Legacy XCE_TESTING election path (`ha_elect_evaluate_and_signal`, ha.c:2141) mirrors the COMMITTING block (ha.c:2247-2300) and must be updated symmetrically — tests drive lifecycle through it + +### Architecture Pattern & Boundary Map + +```mermaid +graph TB + subgraph raft_library + RAFT[raft FSM
on_become_leader] + end + subgraph ha_role_lifecycle[ha.c role lifecycle - this spec] + BL[raft_cb_become_leader
rewritten] + HELPER[ha promotion sequence
shared helper] + LEGACY[ha_elect_evaluate_and_signal
XCE_TESTING path] + GATE[ha_dispatch_gate
COMMITTING branch deleted] + PRED[role predicates
is_primary, should_redirect, vote gates] + end + subgraph persist_repl[persist.c / repl.c - consumed] + NOOP[persist_wal_async WAL_NOOP
append + broadcast] + CLS[wal_classify
WAL_NOOP → RETAIN row] + end + subgraph commit_engine[commit engine - consumed] + REG[commit_submit RETAIN] + WL[commit_set_writable_lsn] + end + STBY[standbys ACK] + + RAFT --> BL + BL --> HELPER + LEGACY --> HELPER + HELPER -->|CTRL_PRIMARY + hooks + heartbeat| PRED + HELPER --> NOOP + NOOP --> CLS + HELPER --> REG + HELPER --> WL + NOOP --> STBY + STBY -->|walAck ≥ noop_lsn| commit_engine +``` + +**Architecture Integration** (sliced from umbrella): +- Selected pattern: one shared promotion sequence with two entry points (raft callback, legacy evaluation) — no second promotion flavor survives; write-safety is delegated entirely to the engine gate rather than a role sub-state +- Existing patterns preserved: safe-LSN truncation, phase2 ordering, endpoint promotion, config push + ctrlhello, heartbeat arming, catch-up decision loop, `errnox` early-return style, barrier-rollout's gate allowlist +- Removal rationale (umbrella): the lifecycle diagram has no COMMITTING node; "no other component may observe COMMITTING after this spec" +- Steering compliance: no blocking added on iomgr or in the raft callback; TDD with testsuite/ tests first; ha-async-io.md synchronized as part of this spec + +### Technology Stack + +| Layer | Choice / Version | Role in Feature | Notes | +|-------|------------------|-----------------|-------| +| Backend / Services | C (gnu17), stdatomic | promotion rewrite, deletions | no new dependencies, no .capnp changes | +| Data / Storage | existing WAL (persist.c) | `WAL_NOOP = 40` entry, empty payload | on-disk format unchanged (new type value only, below WAL_ENTRY_TYPE_MAX) | +| Build / Test | meson, testsuite/ pattern | test_ha_role_lifecycle.c; two test files deleted | XCE_TESTING seams | + +## File Structure Plan + +### Directory Structure +``` +src/controller/ +├── ha.c # MODIFIED — promotion rewrite, all deletions, predicate collapse +├── ha.h # MODIFIED — enum value, fields, defaults, decls removed; comments +├── cluster.c # MODIFIED — committing_timeout_ms init removed; comment sweep +├── persist.c # MODIFIED — apply_wal_entry WAL_NOOP case; wal_classify row +├── meson.build # MODIFIED — test list: -test_ha_repl_ack.c, -test_ha_evaluate_committing.c, +│ # +test_ha_role_lifecycle.c +└── testsuite/ + ├── test_ha_role_lifecycle.c # NEW — direct promotion, noop+gate, predicate honesty, no watchdog + ├── test_ha_repl_ack.c # DELETED — subject machinery removed + ├── test_ha_evaluate_committing.c # DELETED — subject machinery removed + └── (8 fixtures) # MODIFIED — COMMITTING expectations retargeted (census in research.md) +src/include/wal_types.h # MODIFIED — WAL_NOOP = 40 +src/lib/raft/raft.c # MODIFIED — stale comment only (line 123) +.kiro/steering/ha-async-io.md # MODIFIED — steering sync (4 sites) +src/controller/CLAUDE.md # MODIFIED — role mapping table (line 40) +.claude/skills/xce-deploy-ha/SKILL.md # MODIFIED — expected log line (line 98) +src/docs/cluster-config-split-analysis.md # MODIFIED — config listing (line 34) +``` + +### Modified Files (what and why) +- `src/controller/ha.c` — the promotion rewrite and every deletion (verified anchor table in research.md §3); net-negative LOC +- `src/controller/ha.h` — remove `CTRL_PRIMARY_COMMITTING`, `HA_DEFAULT_COMMITTING_TIMEOUT_MS`, `committing_timeout_ms`, `repl_ack_count`, `committing_timeout_ctx`, decls of the two deleted functions; comment sweep; `standby_reported_*`/`standby_converged` arrays stay +- `src/controller/cluster.c` — drop `.committing_timeout_ms` initializer (cluster.c:899); update the ctrlhello comment (cluster.c:1402-1410) +- `src/controller/persist.c` — `apply_wal_entry` gains `case WAL_NOOP: break;` (LSN-advance/ACK via the existing common path); `wal_classify` gains the WAL_NOOP → `WAL_MODE_RETAIN` row pre-declared by barrier-rollout +- `src/include/wal_types.h` — `WAL_NOOP = 40` with comment (internal, empty payload, replay no-op, promotion-only) +- `src/controller/testsuite/test_config_repl.c` — delete the 11 `cfg.committing_timeout_ms` initializers (compiler-forced once the field is gone) + +## System Flows + +### Promotion (after this spec) — `raft_cb_become_leader` + +```mermaid +sequenceDiagram + participant RF as raft FSM + participant BL as raft_cb_become_leader + participant P as persist + participant CE as commit engine + participant S as standbys + RF->>BL: on_become_leader(term) + BL->>BL: sync term, truncate to safe_lsn, phase2 (existing) + BL->>BL: role = CTRL_PRIMARY (direct), register persist hooks + BL->>BL: promote vote eps, push config, ctrlhello, start heartbeat (existing) + BL->>P: persist_wal_async(WAL_NOOP, len=0) → lsn=N, broadcast + BL->>CE: commit_submit(N, RETAIN, 0) + BL->>CE: commit_set_writable_lsn(N) + S-->>CE: walAck acked_lsn >= N (live or via catch-up) + CE->>CE: committed_lsn >= N → own-term gate open + Note over CE: request waiters complete only when
committed_lsn >= max(their lsn, N) +``` + +**Promotion ordering decisions**: hooks are registered BEFORE the no-op append so the persistence seam is live for any racing client write (their entries land after the no-op in LSN order and wait behind it — 2.1). The gate is set immediately after the append; in the sub-microsecond window before `commit_set_writable_lsn` returns, request-shaped entries still cannot be falsely confirmed — their own commits require per-entry majority of new-term entries, which transitively covers the no-op (single-writer contiguous advancement). Standalone (`n_peers <= 1`): the engine's self-quorum commits the no-op at registration and the gate opens immediately — standalone promotion latency is unchanged (umbrella 7.5). No watchdog of any kind is armed (1.5, 2.3). + +### Role lifecycle (umbrella diagram, the contract this spec realizes) + +```mermaid +stateDiagram-v2 + [*] --> INIT + INIT --> STANDBY: heartbeat seen + INIT --> ELECTING: timeout + ELECTING --> PRIMARY: quorum won, truncate to safe_lsn, append noop + ELECTING --> STANDBY: lost or higher term + PRIMARY --> RESTART: higher term seen (ha-convergence-recovery) + STANDBY --> ELECTING: primary lost + RESTART --> INIT: process self restart via boot recovery +``` + +No COMMITTING node exists; the `PRIMARY → RESTART` demotion edge is owned by ha-convergence-recovery (this spec only deletes the committing-timeout cancel block inside `raft_cb_become_follower`, leaving its current demote-to-STANDBY behavior otherwise as-is). + +### Pre-own-term request handling (2.2) +A state-changing request arriving after the role store but before the no-op commits takes exactly one of two paths, both engine-owned: (a) through the barrier — the handler's `commit_submit(WAIT)`/`persist_commit_barrier` blocks until `committed_lsn` covers both the entry and `writable_lsn`, confirming only on real majority; or (b) `-XCE_ERR_NOT_READY` fast rejection (admission cap, or gate-unmet engine policy), surfaced to the requester via the existing errnox reply path. No third path exists because the dispatch gate's COMMITTING rejection branch is gone and handlers have no other completion mechanism (barrier-rollout sweep). Status queries and replication traffic are unaffected: the PRIMARY gate branch (including the fact allowlist) admits them as today (1.3, 1.4). + +## Requirements Traceability + +| Requirement | Summary | Components | Flows | +|-------------|---------|------------|-------| +| 1.1 | election winner → PRIMARY directly | Promotion Rewrite, Legacy Path Symmetry | promotion | +| 1.2 | single leader role; zero residual references | Transitional-State Deletions, Reference Sweep | — | +| 1.3 | primary processes via barrier, never redirects | Role Predicate Simplification (`ha_should_redirect` fixed by state removal), Transitional-State Deletions (gate branch) | pre-own-term handling | +| 1.4 | status reports primary pre-own-term-commit | Role Predicate Simplification (`ha_is_primary` honest by construction) | promotion | +| 1.5 | no wall-clock leadership change | Transitional-State Deletions (watchdog + counters) | — | +| 2.1 | no confirmation before own-term entry commits | WAL_NOOP Entry, Promotion Rewrite (`commit_set_writable_lsn`) | promotion | +| 2.2 | pre-own-term requests: barrier or NOT_READY only | Promotion Rewrite (gate armed), engine contract (consumed) | pre-own-term handling | +| 2.3 | no timeout bypassing the own-term gate | Transitional-State Deletions (watchdog deleted without replacement) | — | + +## Components and Interfaces + +| Component | Layer | Intent | Req Coverage | Key Dependencies | Contracts | +|-----------|-------|--------|--------------|------------------|-----------| +| WAL_NOOP Entry | wal_types.h, persist.c | own-term commit vehicle: empty entry, replay no-op | 2.1 | persist append/broadcast (P0), wal_classify (P0) | State | +| Promotion Rewrite | controller/ha.c | direct PRIMARY + hooks + noop + gate, one shared sequence | 1.1, 1.4, 2.1, 2.2 | raft callback (P0), commit engine (P0), WAL_NOOP (P0) | State | +| Transitional-State Deletions | controller/ha.c, ha.h, cluster.c | remove COMMITTING and all machinery serving it | 1.2, 1.3, 1.5, 2.3 | — | State | +| Role Predicate Simplification | controller/ha.c | collapse compound role checks; honest predicates | 1.3, 1.4 | — | Service | +| Legacy Path Symmetry | controller/ha.c (XCE_TESTING) | `ha_elect_evaluate_and_signal` mirrors production promotion | 1.1, 1.5 | shared promotion sequence (P0) | State | +| Reference Sweep | tests, docs, steering | grep-verified zero COMMITTING references | 1.2 | census (research.md §3) | — | +| Role Lifecycle Tests | testsuite/test_ha_role_lifecycle.c | pin the new lifecycle contract | all | XCE_TESTING seams | — | + +### WAL_NOOP Entry (`src/include/wal_types.h`, `src/controller/persist.c`) + +| Field | Detail | +|-------|--------| +| Intent | A current-term log entry with no state-machine effect, existing purely to satisfy Raft §5.4.2 | +| Requirements | 2.1 | + +**Responsibilities & Constraints** +- `WAL_NOOP = 40` in `wal_entry_type` (wal_types.h:44-58): below `WAL_ENTRY_TYPE_MAX` (100) so existing standby apply advances `current_lsn` and ACKs it through the common path (persist.c:719-721); the value gap 31–99 is otherwise free +- `payload_len = 0`; appended only by the promotion sequence via `persist_wal_async(p, WAL_NOOP, NULL, 0)` — one call appends, fsync-schedules, and broadcasts (repl_broadcast, persist.c:358) +- Replay/apply: explicit `case WAL_NOOP: break;` in `apply_wal_entry`'s type switch (persist.c:728-765) — no entity restore, no hooks; boot replay and standby apply are byte-identical no-ops +- Classification: `wal_classify(WAL_NOOP, *) → WAL_MODE_RETAIN` — the row barrier-rollout pre-declared ("guard forces classification"); the enum value and the row land in the same change so the totality test never breaks +- One entry per election win; no compaction concern (checkpointing treats it like any committed entry) + +**Contracts**: State [x] — the entry's LSN is the term's `writable_lsn`; `committed_lsn >= noop_lsn` ⇔ own-term condition met + +### Promotion Rewrite (`ha.c` — `raft_cb_become_leader` + shared sequence) + +| Field | Detail | +|-------|--------| +| Intent | One promotion sequence: ELECTING → PRIMARY directly with hooks, heartbeat, no-op, and gate | +| Requirements | 1.1, 1.4, 2.1, 2.2 | + +**Responsibilities & Constraints** +- `raft_cb_become_leader` (ha.c:445-617) keeps unchanged: term sync from raft, `ha_compute_safe_committed_lsn` + `persist_truncate_wal_above`, `last_known_committed_lsn`/`committed_config_tag` stores, first-boot `cluster_init_phase2`, per-term convergence-array memsets (still feed the catch-up loop), vote-endpoint promotion, config push, ctrlhello, `ha_start_primary_heartbeat` +- Replaces the COMMITTING store (ha.c:505-508) with a direct `CTRL_PRIMARY` store + `INFO("HA FSM (raft): → CTRL_PRIMARY ...")`; deletes the `repl_ack_count` reset (ha.c:511) and the entire watchdog-arm block (ha.c:593-616) +- **Hook registration moves here** (from `ha_promote_to_primary`, ha.c:1691-1698): extracted into a static helper (`ha_register_persist_hooks(cluster_t *c)` with the existing `hooks_registered` idempotency guard) called by both the rewrite and the surviving `ha_promote_to_primary`; registration precedes the no-op append so the persistence seam is live before any client write can race +- Appends the no-op and arms the gate (production, `c != NULL`): `persist_wal_async(WAL_NOOP)` → derive `noop_lsn = current_lsn - 1` under `p->lock` (same pattern as persist.c:1019-1021) → `commit_submit(&c->commit, noop_lsn, COMMIT_MODE_RETAIN, 0)` → `commit_set_writable_lsn(&c->commit, noop_lsn)`. Under `XCE_TESTING` with no cluster/persist context, the append and gate are skipped (gate unset = no gate, engine default) — lifecycle tests assert role/predicate behavior; gate behavior is asserted with a real engine instance +- No `ha_do_promote` call in this path: the raft-owned term was already synced at entry (ha.c:451); the legacy double-increment wart dies with the deleted convergence callers +- `ha_promote_to_primary` (ha.c:1686-1706) survives for its non-raft callers (cluster.c:1121 init-time, legacy path, tests): body becomes `ha_do_promote` + `ha_register_persist_hooks` + `ha_start_primary_heartbeat` + the same noop+gate tail (guarded on persist/engine availability) so every road to PRIMARY arms the own-term gate + +**Dependencies** +- Inbound: raft FSM `on_become_leader` (P0); legacy evaluation path (P0, XCE_TESTING) +- Outbound: persist append/broadcast (P0); commit engine registration + gate (P0) + +**Contracts**: State [x] +- Postconditions: role == CTRL_PRIMARY; persistence hooks registered; heartbeat armed; (production) a WAL_NOOP of the current term is appended+broadcast and `writable_lsn == noop_lsn` +- Invariants: no path sets any role value other than {PRIMARY, STANDBY, INIT, ELECTING}; promotion never blocks on the no-op committing (1.4 — status honesty does not wait) + +**Implementation Notes** +- Integration: `cluster_init_phase2` call point unchanged; the noop append happens after endpoint promotion so the broadcast reaches the freshly promoted standby endpoints; standbys not yet in the replicator registry receive the entry via the existing uncommitted-suffix catch-up streaming +- Validation: lifecycle test asserts no observable role transition through any intermediate value (atomic store — single transition ELECTING→PRIMARY) +- Risks: none new at runtime — the window "role==PRIMARY, gate not yet set" cannot falsely confirm (see §Promotion ordering decisions) + +### Transitional-State Deletions (`ha.c`, `ha.h`, `cluster.c`) + +| Field | Detail | +|-------|--------| +| Intent | Remove the state and every mechanism that existed only to serve it — no replacements, no shims | +| Requirements | 1.2, 1.3, 1.5, 2.3 | + +**Deletion list** (verified anchors in research.md §3; grep before editing): +- `CTRL_PRIMARY_COMMITTING` enum value (ha.h:64) — final removal step, compiler-enforced sweep +- Dispatch-gate COMMITTING branch (ha.c:1594-1612) — the `case CTRL_PRIMARY_COMMITTING:` block ONLY; the PRIMARY branch, including barrier-rollout's fact allowlist (`OPCode_notify/update/setpreason/clrpreason` under no-quorum), is preserved byte-for-byte +- `committing_timeout_fn` (ha.c:3080-3121), `committing_timeout_fn_for_test` (ha.c:2950-2990), `committing_timeout_ctx_t` (ha.c:64-69, fwd decl :83), watchdog arming in become-leader (ha.c:593-616) and in the legacy path (ha.c:2275-2299), the cancel block in `raft_cb_become_follower` (ha.c:640-648), `committing_timeout_ctx` field (ha.h:187), `committing_timeout_ms` knob (ha.h:131, :141; cluster.c:899; test_config_repl.c ×11) +- `ha_check_majority_convergence` (ha.c:1295-1353; decl ha.h:396-412) and its call site in the heartbeat-reply path (ha.c:2710-2715) +- `repl_ack_count` (ha.h:180; resets ha.c:511, :835, :2255) and `ha_repl_ack_received` (ha.c:3123-3141; decl ha.h:626-630); its `OPCode_replCatchUpDone` call site (ha.c:2659-2661) becomes a logged no-op — the opcode remains gate-allowed (standbys still send it; `repl_complete_catchup` on the replicator path is unrelated and unchanged) +- KEPT deliberately: `standby_reported_tag/lsn`, `standby_converged`, `ha_process_standby_state` (catch-up decision loop + observability); the per-term memsets in become-leader + +**Contracts**: State [x] — after this spec, `ctrl_role_t` has exactly four values and no component, test, or document observes a fifth + +### Role Predicate Simplification (`ha.c`) +Summary-only: collapse every `role == CTRL_PRIMARY || role == CTRL_PRIMARY_COMMITTING` compound to the PRIMARY check — `raft_cb_vote_eligible` (ha.c:210-211), `handle_request_vote` XCE_TESTING gates (ha.c:1984, 2004), `vote_ep_err_handler` (ha.c:3159), `peer_ctrl_msg_handler` case labels (ha.c:2789), and the heartbeat re-arm/run condition in `primary_heartbeat_fn` (ha.c:3956 — drops the COMMITTING term, satisfying the umbrella's "heartbeat re-arm condition drops COMMITTING"). `ha_is_primary` (ha.c:917-920) and `ha_should_redirect` (ha.c:1655-1664) need **zero code change** — both already test PRIMARY only; deleting the state makes them honest by construction (1.4: the elected node's role IS primary; 1.3: a live primary can never satisfy the redirect condition). Vote denial semantics are preserved exactly: a node that won the election denies same-term challengers as PRIMARY (it previously denied as COMMITTING). Comments updated at each site. + +### Legacy Path Symmetry (`ha.c` — `ha_elect_evaluate_and_signal`, XCE_TESTING) +Summary-only: the legacy election evaluation's CTRL_PRIMARY branch (ha.c:2247-2300) is updated symmetrically — direct `CTRL_PRIMARY` store (replacing the COMMITTING store at 2248-2252), `repl_ack_count` reset deleted (2255), config-push/ctrlhello test hooks kept, watchdog-arm block deleted (2275-2299). Promotion side effects route through the same shared sequence (`ha_promote_to_primary` / `ha_register_persist_hooks`) so test-driven and raft-driven promotion cannot diverge; the noop+gate tail is guarded on persist/engine availability as in production. Existing tests that drove COMMITTING through this path are retargeted in the sweep (1.1, 1.5). + +### Reference Sweep (tests + documentation) +Summary-only: the census in research.md §3 is the authoritative population. Test fixtures: **delete** `test_ha_repl_ack.c` and `test_ha_evaluate_committing.c` (their subjects are the deleted machinery; surviving concerns — promotion on quorum, no-promotion-without-majority — are re-pinned in `test_ha_role_lifecycle.c` against the new mechanism); **update** `test_ha_role.c`, `test_ha_startup.c`, `test_ha_rdhup_integration.c`, `test_ha_repl_push.c`, `test_ha_connection_reuse.c`, `test_ha_start_election_async.c`, `test_ha_vote_gate.c` (COMMITTING expectations → PRIMARY), and `test_config_repl.c` (drop the deleted config field); update `meson.build`. Documentation: `ha-async-io.md` (heartbeat re-arm :51, two-tier/promotion :57, dispatch-gate table :68, Raft mapping :79 — rewritten to the three-state model + own-term gate), `src/controller/CLAUDE.md`:40, `.claude/skills/xce-deploy-ha/SKILL.md`:98 (expected log becomes `→ CTRL_PRIMARY` once), `src/docs/cluster-config-split-analysis.md`:34. Completion is grep-verified: zero matches for `CTRL_PRIMARY_COMMITTING|PRIMARY_COMMITTING|committing_timeout|repl_ack_count|ha_repl_ack_received|ha_check_majority_convergence` outside `.git/` and `.kiro/specs/` history (1.2). + +## Data Models + +### Domain Model (changes only) +- **ctrl_role_t**: 5 values → 4 (`CTRL_PRIMARY`, `CTRL_STANDBY`, `CTRL_INIT`, `CTRL_ELECTING`); enum numbering of survivors unchanged (no persisted role values exist — role is volatile) +- **WAL entry**: new type `WAL_NOOP = 40`, header-only (payload_len 0); wire/disk format otherwise unchanged +- **ha_state_t**: − `repl_ack_count`, − `committing_timeout_ctx`; `ha_config_t` − `committing_timeout_ms` +- **writable_lsn** (engine-owned, set by this spec): volatile, never persisted (Raft-conformant; a restarted node re-promotes or rejoins) +- Invariants: `committed_lsn >= writable_lsn` ⇔ the current term has a committed entry; exactly one leader role value exists + +## Error Handling + +### Error Strategy +- Promotion no-op append failure (`persist_wal_async` < 0, e.g. disk error): ERROR log; no LSN exists, so the gate stays unset for this term and promotion completes. This is degraded-but-safe: with the gate unset the engine applies no own-term hold, but every confirmation still requires per-entry majority of a new-term entry (universal barrier) — the first state-changing entry of this term becomes the de-facto own-term vehicle (2.2's "process through the barrier" arm). A WARN documents the condition; a node that cannot write its WAL at all fails operations through the existing persist error paths +- Pre-own-term request rejection: `-XCE_ERR_NOT_READY` via the engine (distinct log message, retriable) — unchanged engine contract, no new codes +- No new timeout semantics anywhere: the only deadline that can fail an operation is the commit timeout owned by the barrier (upstream) +- Deletion regressions are compile-time by design: removing the enum value last forces the compiler to surface every missed reference + +### Monitoring +- Promotion INFO logs: `→ CTRL_PRIMARY (term=N)` plus `own-term noop appended lsn=N` and gate-set confirmation; commit latency of the promotion no-op is observable from existing engine counters (umbrella monitoring item) + +## Testing Strategy + +### Unit Tests (`testsuite/test_ha_role_lifecycle.c`, XCE_TESTING) +- Direct promotion: driving the become-leader path (raft callback seam) yields role == CTRL_PRIMARY with no intermediate observable state; `ha_is_primary` true immediately; `INFO` transition logged once (1.1, 1.4) +- No redirect from a live primary: `ha_should_redirect` == 0 the instant promotion returns, before any ACK arrives (1.3) +- Own-term gate: with a real engine instance (n_peers=3 stub registry), promotion appends WAL_NOOP (entry observable in the WAL with payload_len 0) and sets `writable_lsn` to its LSN; a request-shaped `commit_submit(WAIT)` for a later entry does not complete while ACKs cover the entry but not the no-op — completes only when `committed_lsn >= noop_lsn` (2.1) +- Pre-own-term behavior: with the gate unmet, WAIT submission resolves only via barrier success or NOT_READY/timeout — never via any promotion-side path; no delaymgr task is armed by promotion (assert via delaymgr task count seam) (2.2, 2.3, 1.5) +- Standalone: n_peers=1 promotion → gate opens immediately (noop self-committed), WAIT submissions complete as before +- Replay: boot replay over a WAL containing WAL_NOOP applies cleanly with no entity side effects (entry count advances, jobmgr untouched) +- Vote honesty: elected node denies same-term votes as PRIMARY (gate parity with the old COMMITTING denial) (1.1) + +### Integration Tests (testsuite/) +- Legacy path symmetry: `ha_elect_evaluate_and_signal` quorum-win drives the same sequence — role PRIMARY directly, hooks registered, no watchdog armed (1.1, 1.5) +- Gate-branch deletion safety: barrier-rollout's gate tests stay green — PRIMARY fact allowlist intact under no-quorum; COMMITTING-specific gate cases removed with the branch (1.3) +- Updated fixtures (sweep): all 8 surviving HA test files green with PRIMARY-retargeted expectations; deleted files absent from meson + +### Regression +- Full controller testsuite + ASAN (`/xce-build controller`) green; grep verification: zero matches for the deleted-symbol pattern set across the repo (excluding `.git/`, `.kiro/specs/`) + +### E2E (deferred to ha-convergence-recovery's 3-node validation, which assumes this lifecycle) +- Kill-primary failover with the promoted standby confirming writes only after its no-op commits — owned downstream; this spec's testsuite seams (promotion hook, engine stub) are designed so that test can drive them + +## Migration Strategy + +This spec is phase 3 of the umbrella's hard-ordered landing ("barrier before state removal") and is itself ordered so the tree compiles and tests stay green at every step: +1. WAL_NOOP entry type + replay/classification (additive, no behavior change) +2. Promotion rewrite + lifecycle tests (COMMITTING no longer *entered* in production; symbols still exist) +3. Legacy-path symmetry (COMMITTING no longer entered anywhere) +4. Machinery deletions (watchdog, convergence checker, ack counters, gate branch, predicates) with their dedicated test files deleted/retargeted in the same step +5. Fixture sweep, then enum-value removal last (compiler enforces completeness), then docs/steering sync and grep verification +Rollback trigger per step: controller testsuite regression or failover E2E failure — reverting restores the prior (transitional-state) lifecycle, which the umbrella tolerates as "no less consistent than before". After step 5 there is no partial state: the grep gate guarantees all-or-nothing completion. diff --git a/.kiro/specs/ha-single-leader-role/requirements.md b/.kiro/specs/ha-single-leader-role/requirements.md new file mode 100644 index 0000000..6d8825d --- /dev/null +++ b/.kiro/specs/ha-single-leader-role/requirements.md @@ -0,0 +1,56 @@ +# Requirements Document + +> Sub-spec 3 of 4 implementing the **ha-consistency-invariants** umbrella contract. +> The umbrella documents (`.kiro/specs/ha-consistency-invariants/requirements.md`, `design.md`, `research.md`) are the authoritative contract. This document restates the slice owned by this spec — umbrella criteria 1.1, 1.2, 1.3, 1.4, 1.5, 3.1, 3.2, 3.3 — as this spec's own numbered requirements. Each criterion notes its umbrella ID; the traceability table at the end gives the full mapping. Locked umbrella decisions (own-term commit via an explicit no-op log entry appended at promotion; no wall-clock timeout may change leadership or confirm operations; the universal commit barrier must be in force before the transitional state is removed) are restated, never re-derived. +> **HARD ORDERING**: this spec must land AFTER ha-commit-barrier-rollout. Removing the transitional state before the universal barrier is in force opens a window where a fresh primary accepts unreplicated writes. + +## Project Description (Input) + +`CTRL_PRIMARY_COMMITTING` is a transitional leader state that Raft does not have. It causes a redirect loop (`ha_should_redirect` points clients at a primary that does not exist yet), `committing_timeout_fn` force-promotes after 60 seconds even with zero converged standbys (violating the commit rule outright), and `ha_is_primary` reports "not primary" during the window even though this node won the election and no other primary exists. Cluster operators need Raft's three-state model: an election winner becomes `CTRL_PRIMARY` directly; post-election write safety comes from committing a no-op log entry of the current term (Raft §5.4.2 own-term commit rule) through the commit engine's writable-LSN gate; and no wall-clock path ever changes leadership or confirms operations. The transitional state, its force-promotion watchdog, its convergence counter, and its acknowledgment counters are deleted outright, with every reference across the controller, its tests, and the steering documentation swept to zero. + +## Introduction + +This spec delivers the single-leader-role slice of the umbrella contract. After this spec, leadership in the XCE controller cluster is a single role: a controller that wins an election is the primary immediately — it reports itself as primary, accepts client traffic subject to the commit barrier, and is never the target of a redirect loop. The weaker guarantee that the transitional state was trying to provide ("don't confirm anything until the cluster has converged") is provided correctly instead by the own-term commit rule: at promotion the new primary appends a no-op entry of its current term and withholds confirmation of every operation until that entry is committed on a majority. Because the entry commits only through real majority acknowledgment, there is no timeout that can force the gate open — the 60-second force-promotion watchdog and the convergence/acknowledgment counting that fed it are removed without replacement. The dispatch-gate behavior contributed by upstream specs (including acceptance of reported facts during quorum loss) is preserved unchanged. + +## Boundary Context + +- **In scope**: Direct election-winner promotion to the primary role; the promotion-time no-op log entry of the current term and its use as the own-term confirmation gate; removal of the transitional leader state, its force-promotion timeout, its convergence checker, and its acknowledgment counters; honest primary self-reporting and redirect behavior; symmetric update of the legacy (testing-only) election evaluation path; exhaustive sweep of every transitional-state reference across controller code, test fixtures, and steering/contributor documentation, verified to zero. +- **Out of scope**: Election and vote correctness — vote RPCs, term management, freshness gates (raft-library); commit-engine internals — per-entry majority evaluation, the writable-LSN gate mechanics, admission cap (ha-commit-engine, consumed as-is); operation classification and reply ordering — which operations wait and which are retained (ha-commit-barrier-rollout, must already be in force); demotion behavior — truncate-and-restart, rejoin reconciliation, egress filtering, catch-up driving, quorum-transition logging (ha-convergence-recovery); replication wire format and standby apply mechanics (ha-wal-replication). +- **Adjacent expectations**: Upstream, this spec consumes the commit engine's writable-LSN gate (`commit_set_writable_lsn`; the engine withholds waiter completion until the commit index covers the writable LSN) delivered by ha-commit-engine, and requires the universal commit barrier plus the dispatch-gate fact allowlist delivered by ha-commit-barrier-rollout to be in force — the gate simplification here must preserve that allowlist. Downstream, ha-convergence-recovery's end-to-end failover validation relies on the simplified lifecycle, and the HA steering document (`ha-async-io.md`) — whose dispatch-gate table and replication-consistency section still describe the transitional state — is synchronized by this spec. + +## Requirements + +### Requirement 1: Unified Primary Role + +**Objective:** As a cluster operator, I want an election winner to act as primary immediately under a single leader role, so that clients are never redirected to a primary that does not exist and the cluster has no transitional mode with weaker consistency guarantees. + +#### Acceptance Criteria + +1. When a controller wins an election, the controller shall assume the primary role directly, without entering an intermediate transitional leader role. *(umbrella 1.1)* +2. The controller shall represent leadership as a single primary role; it shall not define a leader sub-state that accepts a different set of operations than the primary role, and no transitional leader state shall remain observable anywhere in the controller, its tests, or its operator-facing documentation. *(umbrella 1.2)* +3. While a controller is primary, when a client request requiring the primary arrives, the controller shall process the request subject to the commit barrier rather than redirecting the client to another node. *(umbrella 1.3)* +4. While a controller is primary, the controller shall report itself as the primary in status queries, regardless of whether it has yet committed an entry in its current term. *(umbrella 1.4)* +5. The controller shall not assume or change leadership based on a fixed wall-clock timeout that bypasses majority acknowledgment. *(umbrella 1.5)* + +### Requirement 2: Post-Election Write Safety + +**Objective:** As a cluster operator, I want a newly elected primary to confirm operations only after an entry of its own term is committed, so that a leadership change never exposes uncommitted or divergent state from prior terms. + +#### Acceptance Criteria + +1. When a controller becomes primary, the primary shall not confirm any cluster-state-changing operation until at least one log entry created in its current term has been acknowledged by a majority of cluster members; the primary shall create such an entry at promotion so that an idle cluster's new primary becomes writable without waiting for client traffic. *(umbrella 3.1)* +2. While the own-term commit condition of criterion 2.1 is unmet, if a state-changing request arrives, the primary shall either process it through the commit barrier (its entry satisfying criterion 2.1 upon majority acknowledgment) or reject it with an error indicating the cluster is not yet ready, and shall not confirm it by any other path. *(umbrella 3.2)* +3. While the own-term commit condition of criterion 2.1 is unmet, the primary shall not be subject to any timeout that confirms operations or advances the commit index without majority acknowledgment. *(umbrella 3.3)* + +## Umbrella Traceability + +| This spec | Umbrella ID | Notes | +|-----------|-------------|-------| +| 1.1 | 1.1 | Election winner → primary directly; transitional state never entered | +| 1.2 | 1.2 | Single leader role; transitional state deleted and swept to zero references (code, tests, docs) | +| 1.3 | 1.3 | No redirect from a live primary; the redirect-loop window cannot exist once the state is gone | +| 1.4 | 1.4 | Status honesty: primary self-reports as primary before its own-term entry commits | +| 1.5 | 1.5 | Force-promotion watchdog deleted without replacement; no wall-clock leadership change | +| 2.1 | 3.1 | Own-term commit rule (Raft §5.4.2) via explicit promotion no-op entry (umbrella-locked decision) | +| 2.2 | 3.2 | Pre-own-term requests: through the barrier or not-ready rejection — never a third path | +| 2.3 | 3.3 | No timeout substitutes for majority acknowledgment while the own-term gate is unmet | diff --git a/.kiro/specs/ha-single-leader-role/research.md b/.kiro/specs/ha-single-leader-role/research.md new file mode 100644 index 0000000..08e9ce3 --- /dev/null +++ b/.kiro/specs/ha-single-leader-role/research.md @@ -0,0 +1,135 @@ +# Research & Discovery Log: ha-single-leader-role + +Date: 2026-06-11. Discovery type: **light/integration-focused** — the umbrella spec (`ha-consistency-invariants`) completed full discovery (research.md, Option C phased hybrid, locked decisions); this log records the slice-specific verification pass: file:line anchors re-verified by grep against the working tree, the COMMITTING reference census that drives the sweep, and the upstream interface alignment (ha-commit-engine, ha-commit-barrier-rollout designs). + +## 1. Locked Umbrella Decisions Consumed (not re-derived) + +- **Own-term commit vehicle**: explicit `WAL_NOOP` entry appended at promotion (umbrella research item 4, DECIDED 2026-06-11) — bounded post-election write-unavailability independent of traffic; an idle cluster's new primary becomes writable as soon as the no-op commits. +- **No wall-clock leadership/confirmation path**: `committing_timeout_fn` force-promotion deleted without replacement (umbrella 1.5/3.3). +- **HARD ORDERING**: this spec lands only after ha-commit-barrier-rollout — the universal barrier must be in force before the transitional state is removed (umbrella migration phase 3; barrier-rollout design: "ha-single-leader-role must not land until the sweep is complete and audited"). +- **Commit state is volatile** (Raft-conformant): `writable_lsn` lives in the commit engine, never persisted; a restart re-runs promotion or rejoins as standby. + +## 2. Upstream Interface Alignment (verified against upstream designs) + +### ha-commit-engine (sub-spec 1) — consumed as-is +- `commit_set_writable_lsn(commit_engine_t *ce, uint64_t noop_lsn)` ships in `include/commit.h` with **no caller** in that spec ("API ships here; no caller in this spec — unset = no gate"). This spec is the designated caller. +- Engine invariant: "no waiter completes successfully while `committed_lsn < its lsn` or (gate set) `committed_lsn < writable_lsn`"; `commit_submit` returns `-XCE_ERR_NOT_READY` when "admission cap exceeded **or own-term gate unmet at entry**" — so umbrella 3.2's "barrier or NOT_READY" disjunction is engine-implemented; this spec only sets the gate. +- `n_peers <= 1` self-quorum: self-ACK constitutes majority — a standalone node's promotion no-op commits immediately and the gate opens with no peer traffic (standalone behavior preserved). +- Engine instance is `cluster_t.commit` (`c->commit`), wired at cluster init; RETAIN registration mode exists for non-blocking entries. + +### ha-commit-barrier-rollout (sub-spec 2) — must not be disturbed +- Classification: `wal_classify(wal_type, detail)` totality is enforced by a fail-fast guard and a totality unit test over every `wal_entry_type` value. Their design pre-declares the row this spec adds: "WAL_NOOP (future) | promotion | internal | RETAIN | added downstream; guard forces classification". **Adding the enum value without the classification row breaks their totality test** — the row lands in the same task as the enum value. +- Dispatch gate: barrier-rollout adds a **fact allowlist** to the `CTRL_PRIMARY` no-write-quorum branch (`OPCode_notify`, `OPCode_update`, `OPCode_setpreason`, `OPCode_clrpreason`). Their design: "The CTRL_PRIMARY_COMMITTING branch is intentionally untouched (deleted wholesale by ha-single-leader-role — known residual until then)." This spec deletes ONLY the COMMITTING branch; the PRIMARY branch including the fact allowlist is preserved byte-for-byte. +- Reply ordering: every request-shaped handler already commit-first-then-reply; this spec adds no reply sites. + +## 3. Verified Code Anchors (grep pass 2026-06-11 against working tree) + +Audit numbers from the brief mostly held; drift noted inline. **Re-verify with grep before editing — barrier-rollout landing first WILL shift ha.c line numbers** (it inserts into the PRIMARY gate branch above the COMMITTING branch). + +### ha.h +| Anchor | Verified | Notes | +|---|---|---| +| `CTRL_PRIMARY_COMMITTING = 4` enum value | ha.h:64 (enum block 59-65) | brief said 59-65 ✓ | +| `HA_DEFAULT_COMMITTING_TIMEOUT_MS 60000` | ha.h:131 | delete | +| `committing_timeout_ms` config field | ha.h:141 | delete | +| `repl_ack_count` field | ha.h:180 | delete | +| `committing_timeout_ctx` field | ha.h:187 | delete | +| `ha_check_majority_convergence` decl + comment | ha.h:396-412 | delete | +| `ha_repl_ack_received` decl + comment | ha.h:626-630 | delete | +| Stale comments mentioning COMMITTING | ha.h:214-230, 244-262, 373, 503-519, 607-614, 673-700, 791 | comment sweep | +| KEEP: `standby_reported_tag/lsn`, `standby_converged` arrays | ha.h:191-193 | still feed `ha_process_standby_state` catch-up decision loop + observability | + +### ha.c (23 CTRL_PRIMARY_COMMITTING refs + machinery) +| Anchor | Verified | Action | +|---|---|---| +| `committing_timeout_ctx_t` type + fwd decl | ha.c:64-69, 83 | delete | +| `raft_cb_vote_eligible` role gate `PRIMARY \|\| COMMITTING` | ha.c:210-211 | collapse to PRIMARY | +| `raft_cb_become_leader` | ha.c:445-617 (brief said ~445-505; body extends through watchdog arm at 593-616) | rewrite (see design) | +| — sets COMMITTING | ha.c:505-508 | → direct CTRL_PRIMARY | +| — `repl_ack_count` reset | ha.c:511 | delete | +| — convergence-array memsets | ha.c:517-519 | KEEP (per-term reset still feeds catch-up loop) | +| — heartbeat start + watchdog arm | ha.c:590, 593-616 | heartbeat stays; watchdog block deleted | +| `raft_cb_become_follower` committing-timeout cancel block | ha.c:640-648 | delete block | +| `ha_init` repl_ack_count init + COMMITTING comment | ha.c:835, 843 | delete/update | +| `ha_do_promote` (term increment + PRIMARY store) | ha.c:887-897 | unchanged; production rewrite does NOT call it (raft owns term — avoid double increment; existing behavior already syncs term at become_leader top, ha.c:451) | +| `ha_is_primary` | ha.c:917-920 ✓ | no code change — honest by construction once the state is gone; comment notes | +| heartbeat-reply convergence tracking comment | ha.c:1257, 1279-1282 | `ha_process_standby_state` KEPT; comment sweep | +| `ha_check_majority_convergence` | ha.c:1295-1353 (brief said 1313-1353; comment starts 1295) | delete (incl. `ha_promote_to_primary` call at 1347, `ha_do_promote` test branch at 1351) | +| dispatch-gate COMMITTING branch | ha.c:1594-1612 ✓ (pre-barrier-rollout numbering) | delete branch only; PRIMARY branch + fact allowlist untouched | +| `ha_should_redirect` | ha.c:1655-1664 ✓ | no code change (PRIMARY→0 already); fixed by state removal; comment | +| `ha_promote_to_primary` hook registration | ha.c:1686-1706 ✓ | registration extracted to shared helper; fn retained for legacy/test callers (cluster.c:1121, test_ha_cluster.c, test_p3_manual_failover.c) | +| `handle_request_vote` (XCE_TESTING) role gates | ha.c:1984, 2004 (comments 1940, 1971) | collapse to PRIMARY | +| stale type/comment block | ha.c:2057-2060 | comment sweep | +| `ha_elect_evaluate_and_signal` legacy COMMITTING block | ha.c:2247-2300 (brief said ~2248 ✓) | symmetric rewrite: direct PRIMARY; delete watchdog arm + repl_ack_count reset | +| `repl_ack_decode_and_dispatch` replCatchUpDone → `ha_repl_ack_received` | ha.c:2625-2627 (comment), 2659-2661 (call) | branch becomes INFO no-op (opcode still gate-allowed; standbys still send it) | +| heartbeat-reply `ha_check_majority_convergence` call | ha.c:2710-2715 | delete call; rest of decision loop unchanged | +| `peer_ctrl_msg_handler` COMMITTING case label | ha.c:2773, 2789 | drop label (falls to PRIMARY case) | +| `committing_timeout_fn_for_test` | ha.c:2950-2990 (region 2945-2995) | delete | +| `vote_ep_err_handler` role check | ha.c:3159 | collapse to PRIMARY | +| `committing_timeout_fn` | ha.c:3080-3121 (brief said 3082-3125 ≈) | delete | +| `ha_repl_ack_received` | ha.c:3123-3141 (brief said 3126-3139 ≈) | delete | +| test-helper comment | ha.c:3044-3045 | sweep | +| `primary_heartbeat_fn` re-arm/run role check | ha.c:3956 | drop COMMITTING term | + +### Other code +| Anchor | Verified | Action | +|---|---|---| +| `cluster.c` config init `.committing_timeout_ms = HA_DEFAULT_COMMITTING_TIMEOUT_MS` | cluster.c:899 | delete line | +| `cluster.c` ctrlhello comment "COMMITTING path" | cluster.c:1402-1410 | comment update | +| `raft.c` comment "HA FSM stays in CTRL_PRIMARY_COMMITTING" | src/lib/raft/raft.c:123 | comment update (raft-library code untouched otherwise) | +| `wal_types.h` enum | src/include/wal_types.h:44-58 | add `WAL_NOOP = 40` (gap 31-99 free; < WAL_ENTRY_TYPE_MAX=100, config.h:80) | +| `apply_wal_entry` type switch | persist.c:691-770 (switch at 728; default:break at 765) | explicit `case WAL_NOOP: break;` — LSN advance happens in common path (persist.c:719-721) so standbys ACK it | +| `persist_wal_async` (append + `repl_broadcast` at persist.c:358) | persist.c:295 | reused as-is for the promotion no-op (rejects only WAL_CHECKPOINT) | +| `wal_classify` table (barrier-rollout) | persist.c (landed by sub-spec 2) | add WAL_NOOP → RETAIN row | +| meson.build `controller_unit_test_src` | src/controller/meson.build:74-131 | remove deleted test files; add test_ha_role_lifecycle.c | + +### COMMITTING reference census (sweep population — grep `CTRL_PRIMARY_COMMITTING|PRIMARY_COMMITTING|committing_timeout|repl_ack_count|ha_repl_ack_received|ha_check_majority_convergence`) + +Test fixtures (counts = matching lines at audit time): +| File | Refs | Disposition | +|---|---|---| +| `testsuite/test_ha_repl_ack.c` | 20 COMMITTING + 34 deleted-symbol | **DELETE** — subject is `ha_repl_ack_received`/`repl_ack_count` counting; valid concerns re-covered by test_ha_role_lifecycle.c | +| `testsuite/test_ha_evaluate_committing.c` | 24 + 13 deleted-symbol | **DELETE** — subject is the COMMITTING evaluation path + `committing_timeout_fn`; direct-PRIMARY evaluation asserted in test_ha_role_lifecycle.c | +| `testsuite/test_ha_role.c` | 37 (+16 deleted-symbol) | UPDATE — role-enum/transition expectations retargeted COMMITTING→PRIMARY | +| `testsuite/test_ha_rdhup_integration.c` | 20 (+8) | UPDATE | +| `testsuite/test_ha_repl_push.c` | 14 | UPDATE | +| `testsuite/test_ha_startup.c` | 12 | UPDATE | +| `testsuite/test_ha_connection_reuse.c` | 11 (+12) | UPDATE | +| `testsuite/test_ha_start_election_async.c` | 7 | UPDATE | +| `testsuite/test_ha_vote_gate.c` | 6 | UPDATE (vote-deny: PRIMARY-only deny expectations) | +| `testsuite/test_config_repl.c` | 11 × `cfg.committing_timeout_ms = 10000;` | UPDATE — delete the field initializers (compiler-forced) | + +Documentation: +| File | Site | Disposition | +|---|---|---| +| `.kiro/steering/ha-async-io.md` | :51 (heartbeat re-arm), :57 (two-tier/COMMITTING promotion), :68 (dispatch-gate table row), :79 (Raft-to-code mapping) | steering sync task | +| `src/controller/CLAUDE.md` | :40 (role mapping table) | sweep | +| `.claude/skills/xce-deploy-ha/SKILL.md` | :98 (expected log line "→ CTRL_PRIMARY_COMMITTING then → CTRL_PRIMARY") | sweep | +| `src/docs/cluster-config-split-analysis.md` | :34 (committing_timeout_ms in config listing) | sweep (historical doc — annotate or update listing) | + +## 4. Slice-Specific Findings + +1. **`ha_is_primary` and `ha_should_redirect` need zero code change.** Both already test `role == CTRL_PRIMARY` only (ha.c:917-920, 1655-1664). The brief's "lies during the window"/"redirect loop" defects are properties of the COMMITTING *state existing* (role ≠ PRIMARY while leading); deleting the state fixes both by construction. The "simplification" is the collapse of every `PRIMARY || COMMITTING` compound check (4 production sites: ha.c:210, 1984, 2004, 3159, 3956, 2789) plus comment honesty. +2. **Term double-increment hazard.** `ha_do_promote` (ha.c:887) increments `ha->term`; production `raft_cb_become_leader` already syncs the raft-owned term at entry (ha.c:451). The old flow reached `ha_do_promote` later via convergence/watchdog → `ha_promote_to_primary`, producing a second increment beyond the raft term — a pre-existing wart that dies with the deleted callers. The rewrite stores `CTRL_PRIMARY` directly (no `ha_do_promote`) in the raft path; the legacy XCE_TESTING path keeps `ha_do_promote` semantics (it owns its term there). +3. **`OPCode_replCatchUpDone` survives the deletion.** Standbys still send it on catch-up completion and the dispatch gate still admits it; its only consumer on the promoted-vote-endpoint path was `ha_repl_ack_received` ack counting (ha.c:2661). The handler branch becomes a logged no-op; `repl_complete_catchup` (repl.c:521, replicator-registry path) is unrelated and unchanged. +4. **Convergence tracking arrays stay.** `ha_process_standby_state` (heartbeat stateReport) feeds the per-standby catch-up decision loop (`ha_dispatch_repl_action_for_standby`), which is unchanged by this spec; only its *promotion consumer* (`ha_check_majority_convergence`) is deleted. The per-term memsets in become_leader stay. +5. **WAL_NOOP value/compatibility**: `WAL_NOOP = 40` sits below `WAL_ENTRY_TYPE_MAX` (100, config.h:80) so current standbys advance LSN and ACK it via the common path in `apply_wal_entry`; replay is a no-op via an explicit case. `persist_wal_async` appends AND broadcasts (repl_broadcast, persist.c:358) — one call does both at promotion. Standbys not yet registered in the replicator at promotion receive the entry via catch-up streaming of the uncommitted suffix (existing mechanism). +6. **Engine registration of the no-op**: after append, the promotion path registers the entry with `commit_submit(ce, noop_lsn, COMMIT_MODE_RETAIN, 0)` (non-blocking, observability) then calls `commit_set_writable_lsn(ce, noop_lsn)`. Standalone (`n_peers <= 1`): engine self-quorum commits it immediately — gate opens with no peer traffic (umbrella 7.5 preserved). +7. **meson test list** (src/controller/meson.build:74-131) registers each test file individually — deleting test_ha_repl_ack.c / test_ha_evaluate_committing.c requires list edits, and test_ha_role_lifecycle.c must be added. + +## 5. Risks + +| Risk | Mitigation | +|---|---| +| Line-number drift after barrier-rollout lands | every task instructs grep-before-edit; anchors here are 2026-06-11 pre-rollout | +| Missed COMMITTING reference (silent semantic residue) | dedicated grep-verification task gating completion (zero matches across repo excluding .git and spec history) | +| Deleting the gate branch disturbs barrier-rollout's fact allowlist | deletion task scoped to the `case CTRL_PRIMARY_COMMITTING:` block only; gate tests from barrier-rollout must stay green | +| Legacy XCE_TESTING path divergence from production | symmetric-update task with its own lifecycle assertions; both paths share the promotion helper | +| Election-win window with unset gate (crash between role store and `commit_set_writable_lsn`) | ordering inside the rewrite: gate set before the role store is observable to request traffic is NOT required — the engine rejects/holds via `writable_lsn` only after set; design orders noop-append + gate-set immediately at promotion, and until set the barrier still requires per-entry majority (entries of the new term); documented in design §Promotion Ordering | + +## 6. Design Synthesis Outcomes + +- **Generalization**: one shared promotion sequence (role store → hook registration → heartbeat → noop append/broadcast → engine registration → writable gate) used by both the raft callback and the legacy evaluation path — no second promotion flavor survives. +- **Build vs adopt**: nothing new is built beyond `WAL_NOOP`; the gate, barrier, classification guard, broadcast, and catch-up are all consumed from upstream specs/existing code. Deletions dominate (net-negative LOC in ha.c). +- **Simplification**: `ha_promote_to_primary` survives only as the legacy/test-path wrapper around the shared helper; no compatibility shim for COMMITTING is kept anywhere (tests asserting it are rewritten or deleted, not stubbed). +- Review gate: all 8 requirement IDs traced to components; no orphan components; boundary↔file alignment verified against the census table. diff --git a/.kiro/specs/ha-single-leader-role/spec.json b/.kiro/specs/ha-single-leader-role/spec.json new file mode 100644 index 0000000..fd214ac --- /dev/null +++ b/.kiro/specs/ha-single-leader-role/spec.json @@ -0,0 +1,23 @@ +{ + "feature_name": "ha-single-leader-role", + "created_at": "2026-06-11T12:00:00Z", + "updated_at": "2026-06-11T12:45:00Z", + "language": "en", + "phase": "tasks-generated", + "umbrella": "ha-consistency-invariants", + "approvals": { + "requirements": { + "generated": true, + "approved": true + }, + "design": { + "generated": true, + "approved": true + }, + "tasks": { + "generated": true, + "approved": true + } + }, + "ready_for_implementation": true +} diff --git a/.kiro/specs/ha-single-leader-role/tasks.md b/.kiro/specs/ha-single-leader-role/tasks.md new file mode 100644 index 0000000..c43caa6 --- /dev/null +++ b/.kiro/specs/ha-single-leader-role/tasks.md @@ -0,0 +1,79 @@ +# Implementation Plan: ha-single-leader-role + +> TDD ordering per project steering (`testing.md`): every implementation sub-task is preceded by a testsuite sub-task that lands failing (RED) tests first; deletion tasks are driven by retargeted test expectations plus compiler enforcement (the enum value is removed LAST so the compiler surfaces every missed reference). New tests live in `testsuite/test_ha_role_lifecycle.c`; two existing test files are deleted (their subject is the deleted machinery) and eight are updated — this shared-ha.c reality is why no `(P)` markers are applied: the plan is sequential. +> **Hard upstream prerequisite**: ha-commit-engine AND ha-commit-barrier-rollout must be implemented and green first — the promotion path calls `commit_set_writable_lsn` on the engine in `cluster_t.commit`, and the universal barrier + dispatch-gate fact allowlist must be in force before the transitional state is removed (umbrella hard ordering). +> Verify exact line numbers with grep before editing — research.md §3 has the 2026-06-11 verified anchor table, but barrier-rollout landing first WILL shift ha.c line numbers. + +- [ ] 1. WAL_NOOP entry type (additive foundation) +- [ ] 1.1 Write RED tests for the no-op entry + - Create `testsuite/test_ha_role_lifecycle.c` (XCE_TESTING pattern, AAA structure) and register it in `controller_unit_test_src` (src/controller/meson.build:74-131); first cases cover the entry type only + - Tests: `persist_wal_async(p, WAL_NOOP, NULL, 0)` appends a header-only entry (payload_len 0) and broadcasts it (stub replicator observes the entry); `apply_wal_entry` on a WAL_NOOP advances `current_lsn` past the entry's LSN and touches no entity state (jobmgr/queue/worker untouched); boot `replay_wal` over a segment containing WAL_NOOP replays cleanly with the same no-effect guarantee; `wal_classify(WAL_NOOP, 0) == WAL_MODE_RETAIN` (keeps barrier-rollout's totality test green) + - Observable completion: build succeeds with the new test file; all new cases FAIL (red) — `WAL_NOOP` does not exist yet + - _Requirements: 2.1_ + +- [ ] 1.2 Implement WAL_NOOP to green + - Add `WAL_NOOP = 40` to `wal_entry_type` (src/include/wal_types.h:44-58) with comment: internal, empty payload, replay no-op, appended only at promotion; value stays below `WAL_ENTRY_TYPE_MAX` (100, src/include/config.h:80) so standbys LSN-advance and ACK it via the existing common path + - Add explicit `case WAL_NOOP: break;` to `apply_wal_entry`'s type switch (persist.c:728-765 anchor); add the `WAL_NOOP → WAL_MODE_RETAIN` row to `wal_classify` (the row barrier-rollout pre-declared) + - Observable completion: all task 1.1 tests PASS; barrier-rollout's classification totality test still PASSES + - _Requirements: 2.1_ + +- [ ] 2. Promotion rewrite: direct PRIMARY + own-term gate +- [ ] 2.1 Write RED lifecycle tests for direct promotion and the own-term gate + - Tests in `test_ha_role_lifecycle.c`: driving the become-leader path yields `ha->role == CTRL_PRIMARY` directly (no intermediate value observable; `ha_is_primary()` true immediately); `ha_should_redirect()` returns 0 the instant promotion returns, before any standby ACK; persistence hooks are registered by promotion (hooksys observes the three persist hook fns; `hooks_registered == 1`); promotion arms NO delaymgr watchdog (delaymgr task-count seam unchanged across promotion); with a real engine (n_peers=3, stub registry): promotion appends WAL_NOOP at lsn=N, registers it RETAIN, and `commit_set_writable_lsn(N)` is in effect — a `commit_submit(WAIT)` for entry N+1 does NOT complete while ACKs cover N+1 but not N, and completes once `committed_lsn >= N`; with the gate unmet a WAIT submission resolves only as barrier success, `-ETIMEDOUT`, or `-XCE_ERR_NOT_READY` — never via any promotion-side path; n_peers=1: gate opens immediately at promotion (noop self-committed), WAIT returns 0 as before + - Observable completion: new cases FAIL (red) against the current COMMITTING-entering `raft_cb_become_leader` + - _Requirements: 1.1, 1.3, 1.4, 1.5, 2.1, 2.2, 2.3_ + +- [ ] 2.2 Rewrite raft_cb_become_leader and share the promotion sequence + - In `raft_cb_become_leader` (ha.c:445-617 anchor): keep term sync, safe-LSN truncation, `last_known_committed_lsn`/`committed_config_tag` stores, phase2, convergence-array memsets, vote-endpoint promotion, config push, ctrlhello, `ha_start_primary_heartbeat`; replace the `CTRL_PRIMARY_COMMITTING` store (ha.c:505-508) with a direct `CTRL_PRIMARY` store + `INFO("HA FSM (raft): → CTRL_PRIMARY (term=...)")`; delete the `repl_ack_count` reset (ha.c:511) and the watchdog-arm block (ha.c:593-616) + - Extract hook registration from `ha_promote_to_primary` (ha.c:1691-1698) into static `ha_register_persist_hooks(cluster_t *c)` (keeps the `hooks_registered` idempotency guard); call it in the rewrite BEFORE the no-op append; `ha_promote_to_primary` body becomes `ha_do_promote` + `ha_register_persist_hooks` + `ha_start_primary_heartbeat` + the same noop+gate tail — every road to PRIMARY arms the gate; the rewrite does NOT call `ha_do_promote` (raft owns the term; no double increment) + - Noop+gate tail (production, guarded on `c != NULL` and engine availability): `persist_wal_async(WAL_NOOP)` after endpoint promotion → `noop_lsn = current_lsn - 1` under `p->lock` → `commit_submit(&c->commit, noop_lsn, COMMIT_MODE_RETAIN, 0)` → `commit_set_writable_lsn(&c->commit, noop_lsn)`; append failure → ERROR + WARN, gate left unset (degraded-but-safe per design Error Strategy), promotion still completes + - Observable completion: all task 2.1 tests PASS; promotion never blocks (returns without waiting for the noop to commit) + - _Requirements: 1.1, 1.3, 1.4, 1.5, 2.1, 2.2, 2.3_ + +- [ ] 3. Legacy XCE_TESTING election path symmetry +- [ ] 3.1 Update ha_elect_evaluate_and_signal and its direct tests (RED → GREEN in one pass) + - Retarget existing legacy-path expectations first (test_ha_start_election_async.c, the evaluation cases in test_ha_role.c): quorum win → role `CTRL_PRIMARY` directly, no watchdog armed — run to confirm RED against current code + - In the CTRL_PRIMARY branch of `ha_elect_evaluate_and_signal` (ha.c:2247-2300 anchor): replace the COMMITTING store (2248-2252) with the direct `CTRL_PRIMARY` store, delete the `repl_ack_count` reset (2255) and the watchdog-arm block (2275-2299); keep the config-push/ctrlhello XCE_TESTING hooks; route promotion side effects through the same shared sequence (noop+gate tail guarded on persist/engine availability, as in production) + - Observable completion: retargeted legacy-path tests PASS; lifecycle test for symmetry PASSES (both entry points produce identical role/hook/heartbeat/no-watchdog state) + - _Requirements: 1.1, 1.5_ + +- [ ] 4. Machinery deletions (watchdog, convergence, ack counters, gate branch, predicates) +- [ ] 4.1 Delete the force-promotion watchdog and ack/convergence machinery + - Delete from ha.c: `committing_timeout_fn` (3080-3121), `committing_timeout_fn_for_test` (2950-2990), `committing_timeout_ctx_t` type + fwd decl (64-69, 83), the cancel block in `raft_cb_become_follower` (640-648); `ha_check_majority_convergence` (1295-1353) and its heartbeat-reply call site (2710-2715); `ha_repl_ack_received` (3123-3141) — its `OPCode_replCatchUpDone` branch in `repl_ack_decode_and_dispatch` (2659-2661) becomes an INFO-logged no-op (opcode stays gate-allowed; `repl_complete_catchup` untouched); `repl_ack_count` init at ha.c:835 + - Delete declarations from ha.h: `ha_check_majority_convergence` (396-412), `ha_repl_ack_received` (626-630) + - Delete test files whose subject is this machinery: remove `testsuite/test_ha_repl_ack.c` and `testsuite/test_ha_evaluate_committing.c` and their entries in `controller_unit_test_src` (meson.build:116, 118 anchors); concerns still valid (promotion only on real quorum, no promotion without majority) are already pinned by task 2.1's gate tests + - Observable completion: controller builds; `grep -rn "committing_timeout_fn\|ha_check_majority_convergence\|ha_repl_ack_received" src/controller/*.c src/controller/*.h` returns zero matches; test suite green + - _Requirements: 1.5, 2.3_ + +- [ ] 4.2 Delete the dispatch-gate COMMITTING branch and collapse role predicates + - Delete ONLY the `case CTRL_PRIMARY_COMMITTING:` block from `ha_dispatch_gate` (ha.c:1594-1612 pre-rollout anchor — re-grep; the block follows the ELECTING case); the CTRL_PRIMARY branch — including barrier-rollout's no-quorum fact allowlist (`OPCode_notify/update/setpreason/clrpreason`) — is preserved byte-for-byte + - Collapse compound role checks to PRIMARY-only: `raft_cb_vote_eligible` (ha.c:210-211), `handle_request_vote` gates (ha.c:1984, 2004), `vote_ep_err_handler` (ha.c:3159), `peer_ctrl_msg_handler` case labels (ha.c:2789), `primary_heartbeat_fn` re-arm/run condition (ha.c:3956 — heartbeat re-arm condition drops COMMITTING); update the stale comments at each site plus ha.c:1940, 1971, 2057-2060, 2625-2627, 3044-3045 and the `ha_is_primary`/`ha_should_redirect` doc comments (no code change in those two functions) + - Update gate tests: COMMITTING-specific cases in `test_ha_vote_gate.c` and gate fixtures retargeted (elected node denies same-term votes as PRIMARY — denial parity pinned) + - Observable completion: barrier-rollout's gate tests (PRIMARY fact allowlist under no-quorum) still PASS; vote-gate tests PASS with PRIMARY-only denial; suite green + - _Requirements: 1.2, 1.3, 1.4_ + +- [ ] 5. Test-fixture sweep and final symbol removal +- [ ] 5.1 Retarget the remaining COMMITTING-referencing fixtures + - Update expectations COMMITTING→PRIMARY (census: research.md §3): `test_ha_role.c` (37 refs), `test_ha_rdhup_integration.c` (20), `test_ha_repl_push.c` (14), `test_ha_startup.c` (12), `test_ha_connection_reuse.c` (11), `test_ha_start_election_async.c` (7), `test_ha_vote_gate.c` (6, residual from 4.2); delete the 11 `cfg.committing_timeout_ms = 10000;` initializers in `test_config_repl.c` + - Each updated test asserts the new contract (direct PRIMARY, no transitional observations), not stubbed compatibility + - Observable completion: full controller suite green; `grep -rln "COMMITTING" src/controller/testsuite/` returns zero files + - _Requirements: 1.1, 1.2_ + +- [ ] 5.2 Remove the enum value and remaining declarations (compiler-enforced completeness) + - Delete `CTRL_PRIMARY_COMMITTING = 4` from `ctrl_role_t` (ha.h:64); delete `HA_DEFAULT_COMMITTING_TIMEOUT_MS` (ha.h:131), `committing_timeout_ms` (ha.h:141), `repl_ack_count` (ha.h:180), `committing_timeout_ctx` (ha.h:187); delete the `.committing_timeout_ms` initializer (cluster.c:899); sweep remaining ha.h comments (214-230, 244-262, 373, 503-519, 607-614, 673-700, 791), the cluster.c ctrlhello comment (1402-1410), and the raft.c comment (src/lib/raft/raft.c:123) + - Fix everything the compiler then surfaces — this is the completeness gate for code references + - Observable completion: clean build with zero warnings about the removed symbols; full controller testsuite + ASAN green via `/xce-build controller` + - _Requirements: 1.2_ + +- [ ] 6. Documentation sync and grep verification +- [ ] 6.1 Synchronize steering and contributor docs to the three-state model + - `.kiro/steering/ha-async-io.md`: heartbeat re-arm sentence (:51 — "PRIMARY only"); Replication Consistency section (:57 — replace the COMMITTING→PRIMARY convergence-promotion sentence with the own-term no-op gate: promotion appends WAL_NOOP, confirmation waits behind `committed_lsn >= writable_lsn`); dispatch-gate table (:68 — remove the CTRL_PRIMARY_COMMITTING row; note the PRIMARY no-quorum fact allowlist); Raft-to-code mapping (:79 — role set without PRIMARY_COMMITTING) + - `src/controller/CLAUDE.md:40` role-mapping table; `.claude/skills/xce-deploy-ha/SKILL.md:98` expected log line (now a single `→ CTRL_PRIMARY`); `src/docs/cluster-config-split-analysis.md:34` config listing (drop the deleted knob) + - Observable completion: `grep -rn "COMMITTING" .kiro/steering/ src/controller/CLAUDE.md .claude/skills/xce-deploy-ha/ src/docs/` returns zero matches + - _Requirements: 1.2_ + +- [ ] 6.2 Final grep verification and full regression + - Run the completion gate: `grep -rEn "CTRL_PRIMARY_COMMITTING|PRIMARY_COMMITTING|committing_timeout|repl_ack_count|ha_repl_ack_received|ha_check_majority_convergence" --exclude-dir=.git --exclude-dir=specs --exclude-dir=.wolf --exclude-dir=.codegraph --exclude-dir=builddir .` — zero matches; the only permitted residue is git history and `.kiro/specs/` documents (this spec's own census and the umbrella audit). Note `.kiro/steering/` is deliberately INSIDE the gate — a missed steering reference fails it + - Run `/xce-build controller` (debug + ASAN + full testsuite) — green; record the grep output and build result as task evidence + - Observable completion: zero-match grep output committed as evidence; controller suite + ASAN green + - _Requirements: 1.2, 1.5, 2.3_ diff --git a/.kiro/specs/ha-wal-replication/brief.md b/.kiro/specs/ha-wal-replication/brief.md new file mode 100644 index 0000000..587607f --- /dev/null +++ b/.kiro/specs/ha-wal-replication/brief.md @@ -0,0 +1,61 @@ +# Brief: ha-wal-replication + +## Problem +WAL entries are written to disk on the primary but never transmitted to standbys. +`repl_broadcast()` is a no-send stub (casts payload to void, only increments counters). +`repl_wait_majority_ack()` returns immediately because the replicator's `standbys[]` +array is never populated from the HA layer's `standby_endpoints`. The result: +job submits succeed locally but are invisible on standbys and not durable across failover. + +## Current State +- `repl.c`: `repl_add_standby()`, `repl_remove_standby()`, `repl_broadcast()`, + `repl_wait_majority_ack()` all exist with correct signatures. `repl_broadcast` + is a stub (line 196-197: `(void)payload; (void)payload_len`). +- `persist.c`: `persist_wal_sync_append()` calls `repl_broadcast` → `repl_wait_majority_ack` + → advances `committed_lsn`. The call chain is wired; the send is what's missing. +- `ha.c` / `config_repl.c`: `ha->standby_endpoints` manages per-standby connections + (promoted vote eps, late-joiner connects). Nobody calls `repl_add_standby()` from here. +- `cluster.c`: `OPCode_walAck` handler exists (`ha_repl_ack_received`) but is unreachable + because standbys never receive WAL entries to ACK. + +## Desired Outcome +1. WAL entries written on the primary are transmitted to all connected standbys. +2. Each standby applies received WAL entries and sends an ACK. +3. The primary advances `committed_lsn` only after a majority of standbys ACK. +4. Job submits, state transitions, and queue changes survive primary failover. + +## Approach +Bridge the replicator and HA layer: +1. **Register**: When the HA layer connects to a standby (promoted vote ep or late-joiner), + call `repl_add_standby()` to register that endpoint with the replicator. +2. **Deregister**: When a standby disconnects (RDHUP / err_handler), call + `repl_remove_standby()`. +3. **Send**: Fill in `repl_broadcast()` to serialize the WAL header + payload into + an `OPCode_walAck` or similar message and enqueue via `xce_request()`. +4. **ACK**: On the standby, when a WAL entry is applied, send a reply carrying the + acked LSN. On the primary, `handle_wal_ack` calls `repl_on_ack()`. + +## Scope +- **In**: repl_broadcast TCP send, HA→replicator standby registration/deregistration, + standby-side WAL ACK reply, integration with existing `repl_wait_majority_ack`. +- **Out**: Changes to the heartbeat-driven decision loop (WAL streaming via NOP replies + is already wired in ha-repl-hardening). Snapshot transfer path. Config replication path. + +## Boundary Candidates +- `repl_broadcast` send implementation (repl.c) +- Standby registration bridge (ha.c / config_repl.c → repl_add_standby) +- Standby WAL ACK reply (cluster.c / ha.c) + +## Upstream / Downstream +- **Upstream**: ha-config-bootstrap (repl_broadcast API, repl_wait_majority_ack), + ha-repl-hardening (WAL catch-up payload, standby-side apply_wal_entry) +- **Downstream**: None — this is the last missing link + +## Existing Spec Touchpoints +- **Reopens**: ha-config-bootstrap task 7.6 (repl_broadcast TCP send deferred) +- **Adjacent**: ha-repl-hardening (WAL payload already wired to standby apply path) + +## Constraints +- Must use the existing `repl_add_standby` / `repl_remove_standby` API +- Must reuse `OPCode_walAck` opcode for the ACK path +- Standby WAL apply must be idempotent (replay-safe) diff --git a/.kiro/specs/ha-wal-replication/design.md b/.kiro/specs/ha-wal-replication/design.md new file mode 100644 index 0000000..d935db6 --- /dev/null +++ b/.kiro/specs/ha-wal-replication/design.md @@ -0,0 +1,112 @@ +# Design: HA WAL Replication + +## Overview + +Bridge the WAL replicator and HA connection layer so WAL entries written on the primary are transmitted to standbys, ACKed, and committed via majority quorum. The existing `repl_broadcast()` is a no-send stub; this design fills in the send path and wires the standby registration/ACK lifecycle. + +## Architecture + +``` + persist_wal_sync_append (persist.c) + → repl_broadcast(payload) ───→ xce_wal_batch_req_raw(standby ep) + → repl_wait_majority_ack() ──→ blocks until majority acked_lsn >= target + + Standby receive (cluster.c): + OPCode_walCatchupEntry → handle_wal_catchup_entry + → ha_apply_wal_catchup_entry → apply_wal_entry + → send WalAckReply(lsn) + + Primary receive (ha.c): + OPCode_reply + WalAckReply → repl_on_ack → signal ack_cond +``` + +## Components + +### 1. repl_broadcast send (repl.c) + +Fill in the stub at `repl.c:193-234`. For each non-catch-up registered standby, serialize the WAL entry into a single-entry `wal_catchup_entry_t` with `raw_payload` from the caller's buffer, and enqueue via `xce_wal_batch_req_raw(ep, &entry, 1)`. + +- The existing stub already iterates `r->standbys[]` and has the catch-up/pending_ack_count guards. +- Replace the `(void)payload; (void)payload_len;` and `s->pending_ack_count++` with actual transmission. +- The `wal_catchup_entry_t` is stack-allocated; `xce_wal_batch_req_raw` copies the payload via capnp serialization (caller retains ownership). + +### 2. Standby registration bridge (ha.c) + +Wire `repl_add_standby` / `repl_remove_standby` into the HA connection lifecycle: + +- **Register on connect**: In `raft_cb_become_leader` (ha.c:~513-529), when promoting vote eps to `ha->standby_endpoints`, also call `repl_add_standby(&c->persist.repl, ep, host, port)`. In `on_standby_connected` (ha.c), when a late-joiner connects, call `repl_add_standby`. +- **Deregister on disconnect**: In `vote_ep_err_handler` (ha.c) and `standby_ep_err_handler_primary` (ha.c), call `repl_remove_standby(&c->persist.repl, ep)`. + +The replicator accesses `c->persist.repl` (already initialized in `persist_init`). + +### 3. Standby ACK reply (cluster.c / ha.c) + +After the standby applies a WAL entry (in `ha_apply_single_entry` or its caller), send a `WalAckReply` to the primary via `xce_reply`: + +- The `WalAckReply` carries `term = ha->term`, `lsn = applied_entry->lsn`, `success = 1`. +- Use `RequestReply_data_walackreplymsg` union arm. +- Sent from `ha_apply_wal_catchup_entry` after successful application of each entry in the batch. + +### 4. Primary ACK handler (ha.c) + +In `repl_ack_decode_and_dispatch` (ha.c:2506), add handling for `RequestReply_data_walackreplymsg`: + +- Extract the ACKed LSN from `WalAckReply`. +- Map the sending endpoint to a peer index via `repl_ep_t` comparison. +- Call `repl_on_ack(&c->persist.repl, ep, acked_lsn)`. + +### 5. WAL entry format + +Reuse `OPCode_walCatchupEntry` with single-entry mode (`n_entries=0`): + +| Field | Source | +|-------|--------| +| lsn | `hdr->lsn` | +| entry_type | `hdr->type` | +| raw_payload | `payload` buffer from caller | +| raw_payload_len | `payload_len` | + +This is backward-compatible with the existing standby-side handler (`ha_apply_wal_catchup_entry` in ha.c:986) and the raw wire encoder (`xce_wal_batch_req_raw` in request.c). + +## Wire Protocol + +``` +Primary Standby + │ │ + │── OPCode_walCatchupEntry ──────→ │ (single entry, lsn + payload) + │ │ → apply_wal_entry + │ ←── OPCode_reply ──────────── │ (WalAckReply { lsn, success }) + │ → repl_on_ack │ + │ → signal majority_ack_cond │ +``` + +## File Structure Plan + +| File | Action | Responsibility | +|------|--------|----------------| +| `src/controller/repl.c` | MODIFY | Fill in `repl_broadcast()` TCP send | +| `src/controller/ha.c` | MODIFY | Register/deregister standbys with replicator; handle incoming WalAckReply | +| `src/controller/cluster.c` | MODIFY | Send WalAckReply after WAL entry applied | +| `src/controller/testsuite/test_ha_wal_repl.c` | CREATE | Unit tests for broadcast send, ACK round-trip, registration lifecycle | +| `.kiro/specs/ha-wal-replication/tasks.md` | CREATE | Implementation task list | + +## Testing Strategy + +- **Unit (broadcast send)**: Create a mock endpoint, call `repl_broadcast` with a test entry, verify `xce_wal_batch_req_raw` is invoked with correct LSN and payload. +- **Unit (registration)**: Call `ha_discover_primary` path that adds a standby, verify `r->standbys[i].ep != NULL` and `repl_broadcast` iterates it. +- **Unit (ACK round-trip)**: Encode a WalAckReply, decode it on the primary side, verify `repl_on_ack` updates `acked_lsn` and signals the condition. +- **Integration**: Start 3-node cluster, submit a job, verify WAL appears on all standbys, kill primary, verify promoted standby has the job. +- **ASAN**: All new tests pass under ASAN with zero leaks. + +## Out of Boundary + +- Changes to `repl_wait_majority_ack` quorum logic (already correct). +- Changes to the HA heartbeat-driven decision loop (WAL streaming for catching-up standbys is already handled by `ha-repl-hardening`). +- Config replication path (uses `OPCode_replConfigPush`, not `repl_broadcast`). +- WAL entry serialization format changes (reuses `wal_catchup_entry_t`). + +## Boundary Commitments + +- `repl_broadcast` transmits via `xce_wal_batch_req_raw` (single-entry mode), NOT a new custom wire format. +- Standby registration uses the existing `repl_add_standby` / `repl_remove_standby` API — no new replicator functions. +- The standby ACK uses the existing `WalAckReply` capnp struct — no schema changes needed. diff --git a/.kiro/specs/ha-wal-replication/requirements.md b/.kiro/specs/ha-wal-replication/requirements.md new file mode 100644 index 0000000..c1d93e6 --- /dev/null +++ b/.kiro/specs/ha-wal-replication/requirements.md @@ -0,0 +1,62 @@ +# Requirements Document + +## Project Description (Input) +Bridge the WAL replicator (`repl.c`) and HA connection layer (`ha.c`/`config_repl.c`) so that WAL entries written on the primary are transmitted to all connected standbys, ACKed by a majority, and committed before the caller is acknowledged. Currently `repl_broadcast()` is a no-send stub, `repl_wait_majority_ack()` returns immediately because no standby endpoints are registered with the replicator, and job submits succeed locally but are invisible on standbys and not durable across failover. + +## 1. Replicator Standby Registration + +The primary shall maintain the replicator's standby list in sync with the HA layer's connected standby endpoints. + +**1.1** When the primary establishes a standby control channel (promoted vote endpoint during election victory, or late-joiner outbound connect), the HA layer shall register the connected endpoint with the replicator via `repl_add_standby`. + +**1.2** When a standby disconnects (RDHUP or connection error), the HA layer shall deregister the endpoint from the replicator via `repl_remove_standby`. + +**1.3** If `repl_add_standby` is called with an endpoint already registered, the system shall treat it as idempotent (no-op or update-in-place). + +## 2. WAL Broadcast + +The primary shall transmit new WAL entries to all registered standbys. + +**2.1** When `repl_broadcast` is called with a WAL entry header and payload, the system shall serialize the entry into a capnp message and enqueue it for transmission to every non-catch-up registered standby via `xce_request`. + +**2.2** While a standby is in catch-up mode (`in_catch_up` flag set), the system shall skip that standby in `repl_broadcast` and not queue WAL entries for it. + +**2.3** If a standby's pending ACK count exceeds `MAX_PENDING_ACKS`, the system shall trigger a catch-up reconnect for that standby and skip it in the current broadcast. + +**2.4** If no standbys are registered, `repl_broadcast` shall return 0 immediately without sending any messages. + +## 3. Standby WAL Receipt and ACK + +The standby shall apply received WAL entries and acknowledge them to the primary. + +**3.1** When the standby receives a WAL entry from the primary, it shall apply the entry to local persistent storage via `apply_wal_entry` and advance its `applied_lsn`. + +**3.2** After successfully applying a WAL entry, the standby shall send an ACK reply to the primary carrying the applied LSN. + +**3.3** If `apply_wal_entry` fails for a received WAL entry, the standby shall log the error, skip the entry, and not send an ACK for it. + +**3.4** The standby shall remain in `CTRL_STANDBY` state throughout WAL receipt and application — it shall not accept job dispatch or client traffic while applying replicated entries. + +## 4. Majority Commit + +The primary shall advance `committed_lsn` only after a majority of standbys have acknowledged a WAL entry. + +**4.1** When `repl_wait_majority_ack` is called for a WAL entry (ack_op == OPCode_walAck), the system shall count standbys whose `acked_lsn >= target_lsn` and return 0 when the count reaches quorum (ceil((n_active + 1) / 2) including the primary's self-ack). + +**4.2** If `repl_wait_majority_ack` times out before quorum is reached, the system shall return -ETIMEDOUT and the caller shall not advance `committed_lsn`. + +**4.3** When the primary receives a WAL ACK from a standby, it shall update that standby's `acked_lsn` in the replicator and signal any waiter on the ACK condition variable. + +**4.4** In a single-node cluster (no registered standbys), `repl_wait_majority_ack` shall return 0 immediately and the primary shall advance `committed_lsn` to the written LSN. + +## 5. Correctness and Observability + +**5.1** The system shall apply WAL entries on the standby in LSN order — entries delivered out of order shall be buffered or rejected. + +**5.2** When `repl_broadcast` transmits a WAL entry to a standby, the system shall log at DEBUG3 level the opcode and target LSN. + +**5.3** When `repl_wait_majority_ack` reaches quorum, the system shall log at INFO level the opcode and quorum count. + +**5.4** When `repl_wait_majority_ack` times out, the system shall log at WARN level with the opcode, timeout value, and per-standby ACK state. + +**5.5** All new WAL replication paths shall pass the controller unit test suite under ASAN with zero new leaks or errors. diff --git a/.kiro/specs/ha-wal-replication/spec.json b/.kiro/specs/ha-wal-replication/spec.json new file mode 100644 index 0000000..2745a53 --- /dev/null +++ b/.kiro/specs/ha-wal-replication/spec.json @@ -0,0 +1,22 @@ +{ + "feature_name": "ha-wal-replication", + "created_at": "2026-06-10T17:00:00Z", + "updated_at": "2026-06-10T17:15:00Z", + "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 +} diff --git a/.kiro/specs/raft-library/spec.json b/.kiro/specs/raft-library/spec.json index 3904d61..9e43cd9 100644 --- a/.kiro/specs/raft-library/spec.json +++ b/.kiro/specs/raft-library/spec.json @@ -3,7 +3,7 @@ "created_at": "2026-05-31T04:00:00Z", "updated_at": "2026-05-31T04:45:00Z", "language": "en", - "phase": "tasks-generated", + "phase": "implemented", "approvals": { "requirements": { "generated": true, @@ -18,5 +18,6 @@ "approved": true } }, - "ready_for_implementation": true + "ready_for_implementation": true, + "note": "bug-339 (voted_for_term restore) fixed 2026-06-09. handle_request_vote guarded under XCE_TESTING \u2014 production path is cluster.c \u2192 raft_on_vote_request. Controller suite green. Req 3.4/3.5 text reflects current behavior (freshness gate in cluster.c dispatcher, higher-term leader step-down)." } diff --git a/.kiro/specs/raft-library/tasks.md b/.kiro/specs/raft-library/tasks.md index a5ad821..9723392 100644 --- a/.kiro/specs/raft-library/tasks.md +++ b/.kiro/specs/raft-library/tasks.md @@ -7,7 +7,7 @@ - `/xce-build lib` compiles to completion without link errors - _Requirements: 8.3_ -- [ ] 2. Public API definition (raft.h) +- [x] 2. Public API definition (raft.h) - [x] 2.1 Define core data structures: raft_role_t, raft_state_t, raft_snapshot_t - `raft_role_t` enum: `FOLLOWER=0`, `CANDIDATE=1`, `LEADER=2` - `raft_state_t` struct: `term`, `role`, `voted_for`, `voted_for_term`, `n_peers`, `self_idx`, `votes_granted`, `replies_received`, `election_decided`, `election_timeout_ms`, `my_priority` @@ -23,7 +23,7 @@ - Header compiles cleanly as a standalone include in a file with no other XCE headers - _Requirements: 1.2, 7.1, 7.2, 7.3_ -- [ ] 3. Core state machine implementation (raft.c) +- [x] 3. Core state machine implementation (raft.c) - [x] 3.1 Implement raft_init and raft_snapshot - `raft_init` validates all required callback pointers are non-NULL (all except `on_vote_eligible` and `on_trace`); returns `-EINVAL` without modifying state if any required callback is NULL or `n_peers < 1` - Initializes from `raft_config_t`: copies `n_peers`, `self_idx`, `election_timeout_ms` (apply 2000ms default if 0), `my_priority`, `initial_term`, `initial_voted_for`; sets `role=FOLLOWER`, `votes_granted=0`, `replies_received=0`, `election_decided=0` @@ -66,7 +66,7 @@ - After `raft_on_leader_lost`, calling `raft_check_and_start_election` with no intervening vote grant starts a new election and returns `RAFT_ELECTION_STARTED` - _Requirements: 5.1, 5.2, 5.3, 6.2, 6.3_ -- [ ] 4. (P) Deterministic N-node simulator (raft_sim.c) +- [x] 4. (P) Deterministic N-node simulator (raft_sim.c) _Depends: 3_ - [x] 4.1 Implement simulator data structures and initialization - `raft_sim_node_t`: contains `raft_state_t state`, `raft_callbacks_t cbs`, `void *ctx` (points back to cluster), `int idx`, `int partition`, per-node event log buffer for `on_trace` capture @@ -86,7 +86,7 @@ - _Requirements: 8.1, 8.2_ - _Boundary: raft_sim.c_ -- [ ] 5. Protocol-level test suite (test_raft.c) +- [x] 5. Protocol-level test suite (test_raft.c) _Depends: 4_ - [x] 5.1 Test Groups A and B: basic election correctness and voted_for invariant (10 cases) - A1: single-node cluster → LEADER immediately; `on_become_leader` fires once; no `on_send_vote_request` calls @@ -138,7 +138,7 @@ - All 6 Unity test cases pass; G1 confirms split-brain freedom across 100 rounds - _Requirements: 5.1, 5.2, 5.3, 8.1, 8.2, 8.3_ -- [ ] 6. (P) Controller adapter: wire raft.h into ha.c +- [x] 6. (P) Controller adapter: wire raft.h into ha.c _Depends: 3_ - [x] 6.1 Add raft_state_t to ha_state_t and initialize at startup - Add `#include "raft/raft.h"` to `ha.h`; add `raft_state_t raft` field to `ha_state_t` diff --git a/.kiro/specs/scheduler-controller-msg-gap/spec.json b/.kiro/specs/scheduler-controller-msg-gap/spec.json index e3cfa6c..f8d5ddc 100644 --- a/.kiro/specs/scheduler-controller-msg-gap/spec.json +++ b/.kiro/specs/scheduler-controller-msg-gap/spec.json @@ -1,7 +1,7 @@ { "feature_name": "scheduler-controller-msg-gap", - "description": "Analyze the codebase to find gaps in the scheduler's handling of controller messages — missing message types, unhandled edge cases, or incomplete message processing paths", - "phase": "tasks-generated", + "description": "Analyze the codebase to find gaps in the scheduler's handling of controller messages \u2014 missing message types, unhandled edge cases, or incomplete message processing paths", + "phase": "implemented", "created_at": "2026-05-11T01:34:00-07:00", "updated_at": "2026-05-11T19:30:00-07:00", "language": "en", @@ -19,5 +19,6 @@ "generated": true, "approved": true } - } -} \ No newline at end of file + }, + "note": "Bugs 335/336 fixed 2026-06-10. Memory leaks in sched_pend_update_killer and test coverage gaps remain documented. Scheduler 15/15 tests green." +} diff --git a/.kiro/specs/scheduler-controller-msg-gap/tasks.md b/.kiro/specs/scheduler-controller-msg-gap/tasks.md index 05f1976..e6a2afd 100644 --- a/.kiro/specs/scheduler-controller-msg-gap/tasks.md +++ b/.kiro/specs/scheduler-controller-msg-gap/tasks.md @@ -124,4 +124,4 @@ Extend `src/scheduler/testsuite/test.c` with unit tests covering every acceptanc - [x] 9.6 Test dequeue path for `XCE_SCHED_OP_UPDATE_RESVALS` — verify unknown host skipped, known host updated - [x] 9.7 Test dequeue path for `XCE_SCHED_OP_JOB_RUSAGE` — verify `-ENOENT` for unknown jobid, rusage stored and plugin called for known jobid; verify `-EINVAL` on NULL rusage - [x] 9.8 Verify dead code symbols are absent — compile-time check that `sched_handle_jobpush` / `sched_handle_workerpush` are not defined (2.1, 2.2) -- [ ]* 9.9 Verify WARN log is emitted in `sched_update()` when any handler returns a non-zero error code (optional — may require log capture infrastructure) +- [~] 9.9 *(gated: log capture infrastructure)* Verify WARN log is emitted in `sched_update()` when any handler returns a non-zero error code (optional — may require log capture infrastructure) diff --git a/.kiro/specs/worker-join-refactor/tasks.md b/.kiro/specs/worker-join-refactor/tasks.md index d3437e2..d9eeb28 100644 --- a/.kiro/specs/worker-join-refactor/tasks.md +++ b/.kiro/specs/worker-join-refactor/tasks.md @@ -2,15 +2,13 @@ ## Task Format -- [ ] Major task number and description -- [ ] Sub-task number and description - Detail items - Observable completion condition - _Requirements: X.X, Y.Y_ --- -- [ ] 1. Foundation: write failing tests for all new worker join behaviors (TDD Red) +- [x] 1. Foundation: write failing tests for all new worker join behaviors (TDD Red) - [x] 1.1 Write failing tests for the shared status and resource update step - Add a new test file (e.g., `test_worker_join.c`) to `src/controller/testsuite/` and register it in `controller_test.c` diff --git a/.kiro/steering/api-standards.md b/.kiro/steering/api-standards.md new file mode 100644 index 0000000..101f734 --- /dev/null +++ b/.kiro/steering/api-standards.md @@ -0,0 +1,144 @@ +# API Standards + +## Philosophy + +Two API surfaces: Go REST API (apiserver) and C daemon messaging (Cap'n Proto over TCP). Both follow a consistent pattern: validate at the boundary, delegate business logic, return structured responses. Non-blocking I/O throughout the daemon layer. + +## Go REST API (apiserver) + +### Handler Pattern + +Every resource follows a single consistent pattern: + +```go +// {Resource}Controller struct +type JobController struct{} + +// {Action}{Resource} handler method +func (j JobController) SubmitJob(ctx *gin.Context) { + // 1. Validate input at the boundary + req, err := preCheckSubmitJobRequest(ctx) + if err != nil { + ReturnError(ctx, common.INVALID_PARAMS_CODE, err.Error(), nil) + return + } + + // 2. Delegate to service layer + result, err := j.svc.Submit(req) + if err != nil { + ReturnError(ctx, common.ERROR_CODE, err.Error(), nil) + return + } + + // 3. Return structured success + ReturnSuccess(ctx, common.SUCCESS_CODE, "submitted", result) +} +``` + +**Rules**: +- Early return on every error — `ReturnError(...); return` +- Keep `preCheck*` functions in the same file as the handler +- Controllers delegate to services — business logic never lives in handlers +- Dependencies flow inward: `controllers → services → store/backend` + +### Response Format + +Every HTTP response uses a consistent envelope via two helpers in `controllers/response.go`: + +```go +// Success (always HTTP 200) +ReturnSuccess(ctx, code, msg, data) +// → {code: 0, msg: "success", data: {...}} + +// Error (HTTP status == code parameter) +ReturnError(ctx, code, msg, details) +// → {code: 401, msg: "access forbidden", details: nil} +``` + +### Standard Error Codes + +All codes defined in `common/common.go`: + +| Code | Constant | Usage | +|------|----------|-------| +| 0 | `SUCCESS_CODE` | All success responses | +| 400 | `INVALID_PARAMS_CODE` | Malformed/missing input | +| 401 | `ERROR_AUTH_CHECK_TOKEN_CODE` | Missing/invalid JWT | +| 403 | `ERROR_AUTH_CODE` | Valid JWT, insufficient permission | +| 404 | `ERROR_NOT_FOUND_CODE` | Resource not found | +| 429 | `ERROR_TOO_MANY_REQUESTS_CODE` | Rate limit exceeded | +| 500 | `ERROR_CODE` | Unexpected server error | + +### Middleware Chain + +Order is defined in `router/routers.go` and is **non-negotiable**: + +``` +WhitelistURL → WhitelistIP → RateLimit → ValidateHandler (JWT) → CORS → RBAC +``` + +- **WhitelistURL**: filter by allowed paths (applied first for efficiency) +- **WhitelistIP**: abort 403 if client IP not in whitelist +- **RateLimit**: 10 req/sec, burst 20 (global config) +- **ValidateHandler**: parse and validate JWT from `Authorization: Bearer` header; validate body content-type +- **CORS**: origin checks via config +- **RBAC**: `RequirePermission("action:scope")` per-route, enforced by `controllers/rbac_check.go` + +### Permission Format + +`"action:scope"` — scopes: `all`, `self`, `cluster`, `hostgroup`, `self_ug`, `self_hg`. +Defined in `config/rbac.yaml`. Roles support inheritance via `includes:`. + +## C Daemon Messaging + +### Cap'n Proto Wire Format + +All inter-daemon messages are Cap'n Proto serialized. Schema: `src/schema/controller.capnp`. + +**Request** (`xce_request_t`): +- `opcode` — OPCode enum (38 values) +- `seq` — request sequence number +- `from` — sender peer info (host/key) +- `body` — union of 27 message types + +**Reply** (`xce_reply_t`): +- `opcode` — always `OPCode_reply` or `OPCode_redirect` +- `status` — error code (0 = success) +- `seq` — echoes request seq +- `data` — union of reply payloads (clusterconf, jobid, stateReport, walackreplymsg, etc.) + +### Key OPCodes + +| Group | OPCodes | Purpose | +|-------|---------|---------| +| Control | `jobsubmit (11)`, `jobdispatch (8)`, `jobcontrol (15)` | Job lifecycle | +| Cluster | `hello (2)`, `join (3)`, `clusterconf (17)`, `heartbeat (25)` | Membership and liveness | +| Replication | `replConfig (29)`, `replConfigPush (30)`, `walCatchupEntry (37)`, `snapshotTransfer (36)` | Config + WAL replication | +| Vote | `requestVote`, reply | Raft election | +| Data | `push (6)`, `get (5)`, `notify (10)` | Data exchange | + +### Daemon I/O Functions + +```c +// Enqueue request to endpoint send buffer (non-blocking, always) +int xce_request(endpoint_t *ep, xce_request_t *req); + +// Enqueue reply to inbound request sender (non-blocking) +int xce_reply(endpoint_t *ep, xce_peerinfo_t *host, xce_reply_t *reply); + +// Cap'n Proto serialize request to packet +int xce_encode(xce_request_t *req, io_packet_t *pkt); + +// Cap'n Proto deserialize packet to request +int xce_decode(io_packet_t *pkt, xce_request_t *req); +``` + +**msg_handler callback**: Each endpoint has `ep->msg_handler` — a function pointer `int (*)(void*)` called by iomgr when a packet arrives. Handlers must return quickly (vtask context). Registered per-endpoint during connection setup. + +### Adding a New Opcode + +1. Add the opcode constant to `src/include/request.h` (OPCode enum) +2. Add the message struct to `src/schema/controller.capnp` (Request/Reply union arms) +3. Rebuild capnp schemas (automatic via meson) +4. Wire the handler in the dispatch gate (`ha_dispatch_gate` in `ha.c`) +5. Add encode/decode paths in `src/lib/request.c` if using raw payloads diff --git a/.kiro/steering/build-deployment.md b/.kiro/steering/build-deployment.md new file mode 100644 index 0000000..1d8d81f --- /dev/null +++ b/.kiro/steering/build-deployment.md @@ -0,0 +1,137 @@ +# Build & Deployment + +## Philosophy + +A single Heremetic build system (Meson + Nix flakes) produces all artifacts — C daemons, Go binaries, AppImage. Every build includes debug symbols + ASAN. Tests run as part of the build, not after. Deployment for HA testing uses a scripted local cluster with per-node data directories and cert management. + +## Build Commands + +All builds use `/xce-build` (skill at `.claude/skills/xce-build/`): + +```bash +/xce-build # all components + all tests +/xce-build lib # libxce + lib tests +/xce-build controller # lib + controller + controller tests +/xce-build scheduler # lib + scheduler + scheduler tests +/xce-build worker # lib + worker (daemon only, no unit tests) +/xce-build apiserver # lib + apiserver + xcecli + Go unit tests +/xce-build xcecli # xcecli + Go tests +``` + +Each invocation: +1. `nix develop` into the hermetic shell +2. `meson setup build --buildtype=debug -Db_sanitize=address` (fresh clean build) +3. `ninja -C build` (compile all + test executables) +4. Run registered meson tests + +## ASAN Integration + +ASAN is enabled in every build by default (`-Db_sanitize=address`). Controller tests set `detect_leaks=0` (known pre-existing leaks flagged as technical debt). Test binaries print LeakSanitizer reports on stderr after exit. + +## Meson Structure + +``` +src/ +├── meson.build # top-level: subdir() order, project() +├── lib/meson.build # libxce shared library + libxce_test +├── controller/meson.build # xce_controller daemon + controller_unit_test +├── worker/meson.build # xcecd daemon +├── scheduler/meson.build # scheduler daemon + test +├── autoscaler/meson.build # autoscaler daemon +├── frontend/apiserver/meson.build # Go apiserver via tools/go_build +└── frontend/xcecli/meson.build # Go xcecli via tools/go_build +``` + +**Dependency flow**: `lib → {controller, worker, scheduler, apiserver}` + +**Test registration**: +```python +# controller/meson.build +test('controller', + controller_unit_test, + suite: 'controller', + timeout: 300, + env: ['ASAN_OPTIONS=detect_leaks=0']) +``` + +**XCE_TESTING flag**: The controller_unit_test executable compiles with `-DXCE_TESTING` to enable test-only seams (hook variables, reset functions). + +## Nix Flake + +Located at `src/flake.nix`. Provides: + +```bash +nix develop # hermetic dev shell (meson, pkgconfig, capnp, packcc, Go 1.23.4, etc.) +nix build .#xcecore # C daemons + apiserver (release) +nix build .#xcecore_debug # default package: debug + ASAN +nix build .#xcecli # CLI only +``` + +**AppImage**: The flake produces an AppImage wrapping `xce` (shell entry point) with bundled daemons, haproxy, glow, and less. The entry script reads from `/tools/appimage/entry.sh`. + +## Local HA Cluster Deployment + +`/xce-deploy-ha` (skill at `.claude/skills/xce-deploy-ha/`): + +```bash +/xce-deploy-ha localhost:9991 localhost:9992 localhost:9993 +``` + +This creates under `/tmp/xce-deploy/`: +``` +certs/ # TLS certs for all peers +controller/ + ctrl-1/ + conf/{current, cluster.bin} # primary's config + data/ # WAL + checkpoint storage + ctrl-2/ + conf/ # receives config via OPCode_replConfigPush + data/ + ctrl-3/ (same as ctrl-2) +logs/ # per-node log files +scripts/ + start.sh ctrl-N # launch a single node + cleanup.sh # wipe data/standby-conf/logs, keep ctrl-1 config + certs +``` + +**Startup** (from deploy dir): +```bash +VERBOSE=-vvv scripts/start.sh ctrl-1 & # primary first +sleep 0.5 +VERBOSE=-vvv scripts/start.sh ctrl-2 & # standby (0.5s stagger for election ordering) +sleep 0.5 +VERBOSE=-vvv scripts/start.sh ctrl-3 & +``` + +**Clean restart** (keeps certs + ctrl-1 config, wipes all data): +```bash +kill -9 $(pgrep xce_controller) 2>/dev/null || true +bash scripts/cleanup.sh +# Then re-start all nodes +``` + +## Go Frontend Build + +Go builds use `src/frontend/Makefile` for development, Meson for production: + +```bash +make build-server # → /tmp/apiserver +make build-cli # → /tmp/xce_static (CGO_ENABLED=0) +make test # unit tests (CGO_ENABLED=0) +make test-backend # CGO-backed backend tests (needs nix dev shell) +make test-integration # full regression suite (needs XCE_BIN + SRV_URL) +``` + +Go modules are independent — `apiserver` and `xcecli` have separate `go.mod` files, no `go.work`. + +## Production Artifacts + +| Artifact | Build command | Output | +|----------|-------------|--------| +| Controller daemon | `nix build .#xcecore` | `xce_controller` binary | +| Worker daemon | same | `xcecd` binary | +| Scheduler daemon | same | `xce_scheduler` binary | +| REST API server | same | `apiserver` binary | +| CLI tool | `nix build .#xcecli` | `xcecli` binary | +| AppImage | `nix build .#xcecore` | `xce-x86_64.AppImage` | +| Debug build | `nix build .#xcecore_debug` | full debug + ASAN binaries | diff --git a/.kiro/steering/ha-async-io.md b/.kiro/steering/ha-async-io.md new file mode 100644 index 0000000..5710237 --- /dev/null +++ b/.kiro/steering/ha-async-io.md @@ -0,0 +1,83 @@ +# HA Protocol & Async I/O + +## Philosophy + +The HA layer combines Raft-style consensus election with a single-writer replication model. The async I/O framework (iomgr/vtaskmgr/delaymgr) enforces strict threading rules: non-blocking dispatch on the epoll thread, thread-pool handler execution, and timer-thread blocking I/O. + +**Single-writer constraint**: only the primary writes WAL entries. This avoids Raft log replication complexity while the election mechanism inherits Raft's safety guarantees (term-based voting, freshness gates, monotonic commits). + +## Async I/O Model + +Three components in `src/lib/`: + +| Component | Thread model | Purpose | Blocking? | +|-----------|-------------|---------|-----------| +| **iomgr** | Single-threaded epoll loop | Inbound packet dispatch, endpoint lifecycle | **Never block** | +| **vtaskmgr** | N-thread pool (default 8, `--vcpus` CLI override; cluster.c:1082) | Executes vtask handlers for dispatched packets | **Return quickly** | +| **delaymgr** | Single timer thread | Periodic/delayed callbacks, connect(), file I/O | **Permitted** | + +**Critical rule**: Never block in a vtask handler. Blocking calls (connect, read, usleep) belong in delaymgr tasks or dedicated threads. + +Outgoing sends use `xce_request(ep, &req)` which enqueues to the endpoint's send buffer — always non-blocking. Replies use `xce_reply(ep, host, &reply)` — also non-blocking. + +## Connection Ownership + +**Inbound vote connections** (accepted on the listener): Used **exclusively** for vote RPC exchange (RequestVote + reply). After the reply is sent, the connection is left open but NOT reused for state push. Owned by the remote peer (caller closes). + +**Outbound control channels** (`ha->standby_endpoints`): Carry all persistent state from primary to standby — ctrlhello, config push, WAL replication, heartbeat NOPs. Owned by `vote_ep_err_handler` (promoted vote endpoints) and `standby_ep_err_handler_primary` (late-joiner outbound connections). Freed on disconnect. + +**Late joiners**: `primary_heartbeat_fn` scans the peers list and opens a fresh outbound connection to any peer absent from `standby_endpoints`. On connect, `on_standby_connected` sends ctrlhello, registers the endpoint, and calls `repl_add_standby`. + +## Raft Election + +`src/controller/raft.c` implements standard Raft-style election: + +- **RequestVote + RequestVoteReply** over Cap'n Proto +- **Freshness gate**: candidate must have `lastLogTerm >= voter` AND `lastLogIndex >= voter` +- **Votes persisted atomically** with term increment (raft_cb_persist) +- **Majority wins**: quorum = ceil(n_peers / 2) +- **safe_committed_lsn** derived from voter RequestVoteReply messages — no round-trip needed after winning +- **WAL truncation** on promotion: `persist_truncate_wal_above(safe_committed_lsn)` removes diverging entries above the safe commit point + +**Key safety invariants**: +- `currentTerm` is monotonic (never decreases) +- `votedFor` updated atomically with term increment before granting any vote +- `commitIndex` never decreases (monotonic) + +## Heartbeat Model + +Bidirectional heartbeat with Raft-style AppendEntries semantics: + +- **Primary → standby**: `OPCode_nop` every `heartbeat_interval_ms` (3s) via self-perpetuating delaymgr one-shot (`ha_start_primary_heartbeat`). Re-arms only while role is PRIMARY or PRIMARY_COMMITTING. +- **Standby → primary**: Each heartbeat reply carries `(applied_lsn, config_tag)` via `RequestReply.stateReport`, giving the primary continuous visibility into standby convergence. +- **Standby liveness watchdog**: `ha_arm_heartbeat_timeout_vtask` armed on entering CTRL_STANDBY. If no message arrives from the primary within `heartbeat_timeout_ms` (10s), triggers re-election via `ha_on_primary_ctrl_fd_rdhup`. + +## Replication Consistency (Two-Tier) + +**Tier 1 — Majority (service gate)**: Every state-changing operation is committed on a majority before acknowledgment. `CTRL_PRIMARY_COMMITTING → CTRL_PRIMARY` promotion gates on majority convergence (n_peers/2 converged standbys). Single-node mode returns -ENODEV (degraded). + +**Tier 2 — Full peers (continuous best-effort)**: Primary continuously pushes config and WAL to **all** standbys via `ha_dispatch_repl_action_for_standby` on each heartbeat reply. The dispatch gate in CTRL_INIT and CTRL_ELECTING allows replication opcodes so campaigning nodes never reject state push. + +## Dispatch Gate + +`ha_dispatch_gate` controls which opcodes are accepted per role: + +| Role | Allowed | +|------|---------| +| **CTRL_PRIMARY** | All opcodes | +| **CTRL_PRIMARY_COMMITTING** | Replication only (heartbeat, replConfig, walAck, hello); job/queue ops rejected | +| **CTRL_STANDBY** | nop, reply, hello, join, shutdown, + all replication opcodes | +| **CTRL_INIT / ELECTING** | requestVote, probeConfigTag, heartbeat, hello, nop, replConfigPush, walCatchupEntry, snapshotTransfer | + +This ensures a campaigning node never rejects state push from the current primary — rejecting during an election window would leave that node permanently behind. + +## Raft-to-Code Mapping + +| TLA+ Variable | XCE Code | +|--------------|----------| +| `currentTerm[i]` | `ha->term` (_Atomic uint64_t) | +| `state[i]` | `ha->role` (INIT, ELECTING, PRIMARY_COMMITTING, PRIMARY, STANDBY) | +| `votedFor[i]` | `ha->voted_for_name[]` | +| `log[i]` | WAL segments in `persist->wal_path` | +| `commitIndex[i]` | `persist->committed_lsn` (_Atomic uint64_t) | +| `lastApplied[i]` | `ha->applied_lsn` (_Atomic uint64_t) | diff --git a/.kiro/steering/product.md b/.kiro/steering/product.md index a426609..a6a9343 100644 --- a/.kiro/steering/product.md +++ b/.kiro/steering/product.md @@ -21,7 +21,7 @@ XCE is an HPC (High-Performance Computing) cluster management system providing j XCE provides a **fully integrated single-vendor stack** (no database setup, unified build system) with an open, buildable codebase (Nix flakes, AppImage packaging). Compared to Slurm/PBS, it eliminates the external database requirement. Compared to commercial LSF, it is open source and reproducibly buildable. -**Key architectural trade-off**: single-writer model throughout — no multi-master consensus. HA failover uses LSF-style priority election (simple, predictable) rather than Raft (10× complexity). All controller state is in-memory; persistence is WAL + checkpoint, not a traditional database. +**Key architectural trade-off**: single-writer model throughout — only the primary writes. HA follows Raft semantics with CP guarantees: consensus election (RequestVote, term-based voting, freshness gates) via `raft.c`/`raft.h`, and majority-ACK log commitment for state-changing writes (WAL entries ≈ Raft log, `committed_lsn` ≈ commitIndex). Operations that cannot reach majority are rejected, never locally degraded. The single-writer constraint is XCE's simplification of Raft — no concurrent client proposals — while commitment and election inherit Raft's safety rules. All controller state is in-memory; persistence is WAL + checkpoint, not a traditional database. ## Active Development Context @@ -29,15 +29,24 @@ The project is in a **persistence and HA transformation** (branch `persistent_ha | Phase | Goal | Status | |-------|------|--------| -| P0 | Restart survival (WAL + checkpoint) | Implementing | -| P1 | Standby election and takeover | Designed | -| P2 | Live replication primary → standby | Designed | -| P2.5 | Worker/scheduler auto-reconnect on failover | Designed | -| P3–P4 | Hardening, metrics, docs | Planned | +| P0 | Restart survival (WAL + checkpoint) | Complete | +| P1 | Standby election and takeover (Raft-style) | Complete | +| P2 | Live replication primary → standby (config + WAL) | Complete | +| P2.5 | Worker/scheduler auto-reconnect on failover | In progress | +| P3–P4 | Hardening, metrics, docs | In progress | + +## Spec-Driven Development + +Features are designed and implemented via the kiro spec system (`.kiro/specs/`). +Each feature follows a 3-phase approval workflow: Requirements → Design → Tasks → Implementation. +Active specs (10 total) include: ha-config-bootstrap, ha-heartbeat-liveness, +ha-peer-connection-reuse, ha-repl-hardening, ha-wal-replication, raft-library, +election-iomgr-refactor, scheduler-controller-msg-gap, worker-join-refactor, +resval-id-decoupling. Key design decisions already locked: - No `fork()` for snapshots (mutex inheritance deadlock in multithreaded controller) -- No Raft (single writer makes consensus overhead unjustified) +- Raft + CP adopted (2026-06-10, supersedes earlier "No Raft"): Raft is the consensus model for both election and log commitment — majority-ACK commit barrier on all state-changing writes, reject (never degrade) when quorum is unavailable. Single-writer log retained as XCE's simplification: the controller is the sole log writer, avoiding concurrent-proposal complexity while inheriting Raft's safety rules (see `.kiro/specs/ha-consistency-invariants/brief.md`) - No BoltDB (using dual zarray COW for application-level checkpointing) - No application-layer encryption (trust OS boundary: chmod 0700, LUKS/dm-crypt) - No WAL logging for job deletion (deferred to checkpoint time to simplify replay) diff --git a/.kiro/steering/roadmap.md b/.kiro/steering/roadmap.md new file mode 100644 index 0000000..6ef5c1a --- /dev/null +++ b/.kiro/steering/roadmap.md @@ -0,0 +1,48 @@ +# Roadmap + +## Overview + +XCE is in the persistence + HA transformation (branch `persistent_ha`). Governing model: Raft consensus + CP (see `product.md` key decisions). Active spec work is tracked per-spec in `.kiro/specs/`; this file is the **single consolidated future-work document** — the forward-looking queue, long-deferred items, and hardening backlog. It absorbs the former `src/docs/FUTURE_WORK.md` (2026-05-12, config-replication-design review), which now redirects here. + +## In Flight + +- **ha-consistency-invariants** — UMBRELLA CONTRACT (requirements + design + research approved/complete). Implementation decomposed 2026-06-11 into the four sub-specs below; the umbrella generates NO tasks itself. Each sub-spec brief references the umbrella docs as authoritative. +- ha-wal-replication — implemented except task 5.4 (live 3-node integration test; needs `/xce-deploy-ha` cluster); sub-spec 4's E2E extends it + +## Specs (dependency order) + +> `[x]` = spec generated (requirements/design/tasks approved, ready for implementation). Implementation tracked via each spec's tasks.md; implement in roadmap order (cross-spec review 2026-06-11: four specs touch ha_dispatch_gate / raft_cb_become_follower in disjoint-but-adjacent regions). + +- [x] ha-commit-engine — commit.c per-LSN majority engine + quorum accounting fixes, wired behind job submit. Dependencies: none. (specs done 2026-06-11: 7 reqs / 4 components / 11 sub-tasks) +- [x] ha-commit-barrier-rollout — classification table, commit-first-then-reply sweep, RETAIN facts, config barrier, idempotency guards. Dependencies: ha-commit-engine. (specs done 2026-06-11: 5 reqs / 6 components / 16 sub-tasks; verified classification supersedes umbrella table for STOP/RESUME/UPDATE/FAIL) +- [x] ha-single-leader-role — promotion no-op + own-term gate, CTRL_PRIMARY_COMMITTING removal. Dependencies: ha-commit-engine, ha-commit-barrier-rollout (HARD: barrier before state removal). (specs done 2026-06-11: 2 reqs / 7 components / 11 sub-tasks) +- [x] ha-convergence-recovery — demotion truncate+self-restart, rejoin reconciliation, egress watermark filter, ACK-driven catch-up, quorum logging. Dependencies: ha-commit-engine (E2E additionally needs ha-single-leader-role). (specs done 2026-06-11: 9 reqs / 7 components / 13 sub-tasks) + +## Future Specs / Backlog (dependency order) + +- [ ] worker-rejoin-resync — **planned long ago, no effort yet (recorded 2026-06-10).** When a worker rejoins after disconnect or controller failover, it shall re-report its running/finished job states so the controller recovers facts whose notifications were lost. Evidence of the gap (ha-consistency-invariants research deep-dive §A): `xce_join_req` carries only `hostattrs_t` (src/lib/request.c:1154-1181) — no job state; worker notify is fire-and-forget with zero redelivery (bug-396), so any job start/finish/fail sent during a disconnect or failover window is permanently lost today. Scope sketch: extend the join/hello exchange (or a post-join message) with a running+recent job-state report; controller reconciles against its job table through the commit barrier (entries go through majority commit like any state change); requires the `mark_job_*` idempotency guards (shared need with ha-consistency-invariants' pending-facts queue). Complements — does not replace — the primary-side pending-facts queue: the queue covers quorum-loss windows while connected; resync covers disconnect/failover windows. **Elevated 2026-06-11**: designated as the official backstop in ha-consistency-invariants Req 2.8 / boundary context — facts the controller received are retained-and-retried until committed; facts that never arrived (or died with the controller) are recovered only by this resync. Dependencies: ha-consistency-invariants (commit barrier + idempotency guards). Extends: worker-join-refactor (implemented — covers attribute/endpoint update on rejoin only). +- [ ] admin-config-tool — drives `OP_upgradeConfig` (prerequisite for config-upgrade Phase 2). Encode ClusterConfig YAML/JSON → Cap'n Proto binary, SHA-256 over the bytes, connect to primary (SSL, same CA), send `OP_upgradeConfig`, display reply (version tag, acked count, errors), poll `OP_probe` after restart. Suggested CLI: `xce-config push --controller --config cluster.yaml`. MUST validate that user configs don't use the reserved name `"lost_and_found"` for any queue/host (defence-in-depth: controller enforces at runtime via `load_primary_config()` FATAL, tool prevents at authoring time; migration: pre-existing clusters must rename before upgrade — see config-replication-design.md §6.5/§7.1). _(From FUTURE_WORK.md §1 + §8, 2026-05-12.)_ +- [ ] primary step-down-on-quorum-loss — optional CP follow-on noted in ha-consistency-invariants brief (writes already blocked on quorum loss; step-down is an availability/clarity optimization). +- [ ] read consistency / leader leases — Raft §8 read-only optimization; status queries may currently observe stale or provisional state (documented deviation in ha-consistency-invariants). +- [ ] entity-bearing snapshots ("Task 11" format) — snapshot files are currently a 16-byte LSN sentinel (persist.c:435-437); real entity serialization unblocks snapshot-based state transfer and faster recovery. **Cheaper than it looks (verified 2026-06-11)**: the dual-zarray COW machinery it needs is already built and unit-tested but dormant — `xzarray_freeze`/`xzarray_thaw` in the vtable (zarray.c:695-757, O(1) freeze, thaw with `should_retain` GC filter, test_zarray_cow.c) with zero production callers (kvmgr.c:297 `vfreeze = NULL /* wired in P0-2 */`). Note: single-generation COW — the snapshot consumer owns freeze/thaw; do not add second concurrent consumers. Slot-level only (snapshots array structure, not object contents — serialize item state under per-object locks during the freeze window). Once landed, also strengthens ha-consistency-invariants §C eviction option (iii) and faster rebuild-on-demotion. + +## Hardening / Direct-Implementation Items + +Smaller items that likely don't warrant a full spec; pick up opportunistically or bundle into adjacent spec work. + +- [ ] OP_heartbeat peers cross-validation — include a hash of the local `--peers` string in heartbeat requests; log ERROR on mismatch between candidates. Detects misconfigured nodes at election time instead of silently risking dual-primary split-brain. _(FUTURE_WORK.md §3.)_ +- [ ] validate_host() real authorization — currently a stub returning success for all peers; MUST be implemented before `CONF_ENABLE_UPGRADE_CONFIG=1`. Minimum: verify peer X.509 CN against a configured allowlist (`--admin-cn` flag or `admin_cn_list` config), reject non-allowlisted `OP_upgradeConfig` with clear error, WARN-log rejected attempts with CN+IP. Future: IP allowlist, role-based access, admin-specific CA. _(FUTURE_WORK.md §6; security-critical.)_ +- [ ] OP_replConfig access control hardening — currently serves the full config blob to any CA-signed SSL peer (trusted-LAN model). Consider: verify requester is a known `--peers` controller, rate-limit per peer, `minimum_role` check (controllers only). _(FUTURE_WORK.md §7.)_ +- [ ] lost-and-found drain command — `xcecli lost-and-found drain`: reassign or cancel sidelined jobs, reset `lost_and_found_job_count`. Automates operator cleanup after config upgrade. _(FUTURE_WORK.md §4.)_ +- [ ] OP_upgradeConfig standby redirect verification — test that a standby returns the primary's address to an admin tool and the tool retries against the primary. Note: redirect semantics change under ha-consistency-invariants Req 1 (no transitional-state redirect); verify against the new behavior. _(FUTURE_WORK.md §5.)_ +- [ ] steering sync — `ha-async-io.md` still documents CTRL_PRIMARY_COMMITTING and the two-tier model; update after ha-consistency-invariants lands. + +## Superseded / Absorbed Items + +- ~~Quorum-ACK gate before config restart~~ _(FUTURE_WORK.md §2)_ — **largely superseded by ha-consistency-invariants Requirement 5**: configuration changes now require majority acknowledgment before being confirmed/committed, and fail to the requester on timeout (no silent rollback when standbys are offline). Residual to verify in that spec's design: restart sequencing after a committed config change (don't restart the primary before the commit barrier passes). +- ~~Lost-and-found keyword validation~~ _(FUTURE_WORK.md §8)_ — folded into the admin-config-tool backlog item above. + +## Notes + +- Backlog items here are seeds for `/kiro-discovery` / `/kiro-spec-init`; promote an item by creating its spec under `.kiro/specs/`. +- Provenance: items marked _(FUTURE_WORK.md §N)_ originate from the 2026-05-12 config-replication-design.md review, merged here 2026-06-10. diff --git a/.kiro/steering/tech.md b/.kiro/steering/tech.md index 30b38d2..069458f 100644 --- a/.kiro/steering/tech.md +++ b/.kiro/steering/tech.md @@ -10,7 +10,7 @@ xcecli (Go/Cobra) ──REST──► apiserver (Go/Gin) ──CGO──► C da Request path inside apiserver: `Gin Router → Middleware (CORS/RateLimit/IPWhitelist/JWT) → RBAC Check → Controller → Services → In-Memory Store` -All controller state is in-memory, seeded at startup from YAML config. No persistent database in the API tier. C daemons communicate via libtirpc RPC; WAL + checkpoint provide persistence at the controller level. +All controller state is in-memory, seeded at startup from YAML config. No persistent database in the API tier. C daemons communicate via TCP using a custom messaging layer: iomgr (epoll-based I/O loop), vtaskmgr (thread pool for packet dispatch), and xce_request/xce_reply for non-blocking send/receive. WAL + checkpoint provide persistence at the controller level. ## Core Technologies @@ -21,7 +21,7 @@ All controller state is in-memory, seeded at startup from YAML config. No persis - **Zap v1.27.0** — structured logging throughout (both Go modules) - **Viper v1.19.0 / v1.20.1** — YAML config management - **Cap'n Proto** — wire serialization for WAL and daemon-to-daemon replication -- **libtirpc** — inter-daemon RPC transport +- **iomgr / vtaskmgr / delaymgr** — libxce async I/O framework: single-threaded epoll loop (iomgr), thread-pool packet dispatch (vtaskmgr), timer thread for periodic/blocking tasks (delaymgr) ## Build Systems @@ -97,4 +97,4 @@ Early return on every error. Log with zap fields before returning. 3. **CGO bridge** — `backend/` package wraps C library calls; unit tests run `CGO_ENABLED=0`, backend tests need `CGO_ENABLED=1` inside nix dev shell. 4. **Swagger-first API docs** — `swaggo/swag` annotations on handlers; docs served at runtime by Gin. 5. **Structured logging** — every log entry carries context via `zap.String()`, `zap.Error()`. Never use `fmt.Println` for operational output. -6. **Single-writer HA** — controller is always one active primary; standby election via LSF-style priority, not consensus. +6. **Single-writer HA** — controller is always one active primary; standby election via Raft-style consensus (term-based voting, freshness gates) in `raft.c`, with the single-writer constraint avoiding Raft log replication complexity. diff --git a/.wolf/anatomy.md b/.wolf/anatomy.md index c4ce945..c2da2c1 100644 --- a/.wolf/anatomy.md +++ b/.wolf/anatomy.md @@ -1,18 +1,14 @@ # anatomy.md -> Auto-maintained by OpenWolf. Last scanned: 2026-06-10T04:02:07.082Z -> Files: 511 tracked | Anatomy hits: 0 | Misses: 0 - -## ../../../../../../tmp/ - -- `e2e-task-7-7.sh` — E2E for ha-repl-hardening task 7.7 — entity-state (snapshot payload) assertion. (~1171 tok) +> Auto-maintained by OpenWolf. Last scanned: 2026-06-11T13:00:00.755Z +> Files: 506 tracked | Anatomy hits: 0 | Misses: 0 ## ./ - `.clang-format` (~226 tok) - `.gitignore` — Git ignore rules (~88 tok) - `.opencode.json` (~55 tok) -- `CLAUDE.md` — OpenWolf (~2137 tok) +- `CLAUDE.md` — OpenWolf (~1400 tok) - `package-lock.json` — npm lock file (~1039 tok) - `package.json` — Node.js package manifest (~1 tok) - `README.md` — Project documentation (~612 tok) @@ -21,7 +17,7 @@ - `settings.json` (~497 tok) - `settings.json.bak` (~329 tok) -- `settings.local.json` (~137 tok) +- `settings.local.json` (~187 tok) - `ucai-formatter-cache.local.json` (~17 tok) ## .claude/rules/ @@ -191,7 +187,7 @@ - `.gitignore` — Git ignore rules (~47 tok) - `codegraph.db-shm` (~8738 tok) -- `daemon.log` (~1092 tok) +- `daemon.log` (~2464 tok) - `daemon.pid` (~44 tok) ## .kiro/settings/rules/ @@ -234,6 +230,10 @@ - `structure.md` — Project Structure (~218 tok) - `tech.md` — Technology Stack (~198 tok) +## .kiro/specs/ + +- `.gitignore` — Git ignore rules (~3 tok) + ## .kiro/specs/.claude/ - `ucai-formatter-cache.local.json` (~17 tok) @@ -246,6 +246,24 @@ - `spec.json` (~129 tok) - `tasks.md` — Implementation Plan (~3693 tok) +## .kiro/specs/ha-commit-barrier-rollout/ + +- `brief.md` — Brief: ha-commit-barrier-rollout (~626 tok) +- `design.md` — Design: ha-commit-barrier-rollout (~10372 tok) +- `requirements.md` — Requirements Document (~3181 tok) +- `research.md` — Research & Design Decisions: ha-commit-barrier-rollout (~3672 tok) +- `spec.json` (~143 tok) +- `tasks.md` — Implementation Plan: ha-commit-barrier-rollout (~3468 tok) + +## .kiro/specs/ha-commit-engine/ + +- `brief.md` — Brief: ha-commit-engine (~588 tok) +- `design.md` — Design: ha-commit-engine (~7600 tok) +- `requirements.md` — Requirements Document (~2715 tok) +- `research.md` — Research Log: ha-commit-engine (~1345 tok) +- `spec.json` (~140 tok) +- `tasks.md` — Implementation Plan: ha-commit-engine (~2682 tok) + ## .kiro/specs/ha-config-bootstrap/ - `brief.md` — Brief: ha-election-raft-config (~16310 tok) @@ -254,16 +272,33 @@ - `manual-tests.md` — Manual Integration Tests: ha-config-bootstrap (~3748 tok) - `requirements.md` — Requirements: HA Config Bootstrap & Raft-Style Quorum Election (~3890 tok) - `research.md` — Cross-Spec Gap Audit (2026-06-03) (~14349 tok) -- `spec.json` (~198 tok) +- `spec.json` (~293 tok) - `tasks.md` — Implementation Plan: HA Config Bootstrap & Raft-Style Quorum Election (~5619 tok) +## .kiro/specs/ha-consistency-invariants/ + +- `brief.md` — Brief: ha-consistency-invariants (~2916 tok) +- `design.md` — Design: ha-consistency-invariants (~8316 tok) +- `requirements.md` — Requirements Document (~3454 tok) +- `research.md` — Gap Analysis: ha-consistency-invariants (~7683 tok) +- `spec.json` (~259 tok) + +## .kiro/specs/ha-convergence-recovery/ + +- `brief.md` — Brief: ha-convergence-recovery (~746 tok) +- `design.md` — Design: ha-convergence-recovery (~9928 tok) +- `requirements.md` — Requirements Document (~3586 tok) +- `research.md` — Research & Design Decisions: ha-convergence-recovery (~3542 tok) +- `spec.json` (~142 tok) +- `tasks.md` — Implementation Plan: ha-convergence-recovery (~3434 tok) + ## .kiro/specs/ha-heartbeat-liveness/ - `design.md` — Design Document: ha-heartbeat-liveness (~5409 tok) - `manual-tests.md` — Manual Integration Tests: ha-heartbeat-liveness — Task 4.5 (~1726 tok) - `requirements.md` — Requirements Document (~2054 tok) - `research.md` — Gap Analysis: ha-heartbeat-liveness (~5437 tok) -- `spec.json` (~129 tok) +- `spec.json` (~171 tok) - `tasks.md` — Implementation Plan (~2227 tok) ## .kiro/specs/ha-peer-connection-reuse/ @@ -271,24 +306,41 @@ - `design.md` — Design Document: ha-peer-connection-reuse (~5369 tok) - `requirements.md` — Requirements Document (~1605 tok) - `research.md` — Research & Design Decisions: ha-peer-connection-reuse (~6598 tok) -- `spec.json` (~130 tok) +- `spec.json` (~169 tok) - `tasks.md` — Implementation Plan: ha-peer-connection-reuse (~2022 tok) ## .kiro/specs/ha-repl-hardening/ -- `design.md` — Design: HA Replication Hardening (~5514 tok) +- `design.md` — Design: HA Replication Hardening (~5577 tok) - `raft-tla-audit.md` — Raft TLA+ Specification Audit (~1591 tok) -- `requirements.md` — Requirements Document (~2817 tok) +- `requirements.md` — Requirements Document (~2850 tok) - `research.md` — Gap Analysis: HA Replication Hardening (~6234 tok) -- `spec.json` (~165 tok) -- `tasks.md` — Implementation Plan: HA Replication Hardening (~4464 tok) +- `spec.json` (~198 tok) +- `tasks.md` — Implementation Plan: HA Replication Hardening (~4501 tok) + +## .kiro/specs/ha-single-leader-role/ + +- `brief.md` — Brief: ha-single-leader-role (~624 tok) +- `design.md` — Design: ha-single-leader-role (~8611 tok) +- `requirements.md` — Requirements Document (~2177 tok) +- `research.md` — Research & Discovery Log: ha-single-leader-role (~3970 tok) +- `spec.json` (~142 tok) +- `tasks.md` — Implementation Plan: ha-single-leader-role (~3232 tok) + +## .kiro/specs/ha-wal-replication/ + +- `brief.md` — Brief: ha-wal-replication (~829 tok) +- `design.md` — Design: HA WAL Replication (~1413 tok) +- `requirements.md` — Requirements Document (~1087 tok) +- `spec.json` (~128 tok) +- `tasks.md` — Implementation Plan: HA WAL Replication (~1737 tok) ## .kiro/specs/raft-library/ - `design.md` — Design Document: raft-library (~7756 tok) - `requirements.md` — Requirements Document (~2115 tok) - `research.md` — Research & Design Decisions: raft-library (~3768 tok) -- `spec.json` (~127 tok) +- `spec.json` (~215 tok) - `tasks.md` — Implementation Plan (~4312 tok) ## .kiro/specs/resval-id-decoupling/ @@ -304,8 +356,8 @@ - `design.md` — Design: scheduler-controller-msg-gap (~4756 tok) - `requirements.md` — Requirements: scheduler-controller-msg-gap (~2712 tok) - `research.md` — Research Log: scheduler-controller-msg-gap (~5630 tok) -- `spec.json` (~184 tok) -- `tasks.md` — Tasks: scheduler-controller-msg-gap (~2324 tok) +- `spec.json` (~230 tok) +- `tasks.md` — Tasks: scheduler-controller-msg-gap (~2334 tok) ## .kiro/specs/worker-join-refactor/ @@ -313,15 +365,19 @@ - `requirements.md` — Requirements Document (~1401 tok) - `research.md` — Research Log: worker-join-refactor (~5421 tok) - `spec.json` (~128 tok) -- `tasks.md` — Implementation Plan (~1658 tok) +- `tasks.md` — Implementation Plan (~1638 tok) ## .kiro/steering/ +- `api-standards.md` — API Standards (~1291 tok) +- `build-deployment.md` — Build & Deployment (~1241 tok) - `error-handling.md` — Error Handling Standards (~782 tok) -- `product.md` — Product Overview (~836 tok) +- `ha-async-io.md` — HA Protocol & Async I/O (~1360 tok) +- `product.md` — Product Overview (~1155 tok) +- `roadmap.md` — Roadmap (~2182 tok) - `security.md` — Security Standards (~804 tok) - `structure.md` — Project Structure (~1139 tok) -- `tech.md` — Technology Stack (~1041 tok) +- `tech.md` — Technology Stack (~1144 tok) - `testing.md` — Testing Standards (~741 tok) ## docs/superpowers/plans/ @@ -335,553 +391,315 @@ - `2026-05-13-config-replication.md` — Config Replication Implementation Plan (~21611 tok) - `2026-05-20-config-repl-wire-protocol.md` — Config Replication — Wire Protocol Completion + Bug Fixes (~5134 tok) -## ha/data/ - -- `xce.crt` — ---BEGIN CERTIFICATE----- (~381 tok) -- `xce.key` — ---BEGIN PRIVATE KEY----- (~455 tok) - -## raft/ - -- `raft.tla` — ------------------------------- MODULE raft --------------------------------- (~5350 tok) - -## src/ - -- `flake.nix` (~571 tok) -- `meson.build` (~623 tok) -- `meson.options` (~90 tok) - -## src/.claude/ - -- `ucai-formatter-cache.local.json` (~17 tok) - -## src/autoscaler/ - -- `meson.build` (~163 tok) - -## src/autoscaler/providers/ - -- `meson.build` (~342 tok) - -## src/autoscaler/providers/baidu/ - -- `BccTool.env` (~64 tok) - -## src/autoscaler/providers/baidu/lsf/conf/ - -- `baiduprov_config.json` (~44 tok) -- `baiduprov_templates.json` (~431 tok) -- `credentials` (~25 tok) -- `logger.yaml` (~196 tok) - -## src/autoscaler/providers/baidu/postprovision/lsf/ - -- `example_user_data.sh` (~486 tok) - -## src/autoscaler/providers/baidu/scripts/ - -- `getAvailableMachines.sh` — This script: (~112 tok) -- `getAvailableTemplates.sh` — This script: (~110 tok) -- `getRequestStatus.sh` — This script: (~110 tok) -- `getReturnRequests.sh` — This script: (~110 tok) -- `requestMachines.sh` — This script: (~110 tok) -- `requestReturnMachines.sh` — This script: (~110 tok) - -## src/autoscaler/providers/baidu/src/bcctool/ - -- `BccTool.env` (~64 tok) -- `go.mod` — Go module definition (~136 tok) -- `go.sum` — Go dependency checksums (~566 tok) -- `main.go` (~355 tok) - -## src/autoscaler/providers/baidu/src/bcctool/client/ - -- `bccClient.go` — ProvCloudClient (63 fields); methods: CreateInstances, ReleaseInstances, ListInstancesByTag, ListAllInstances (~3781 tok) - -## src/autoscaler/providers/baidu/src/bcctool/enums/ - -- `provCode.go` — All error codes used in the Baidu Cloud provider plugin (~1198 tok) - -## src/autoscaler/providers/baidu/src/bcctool/model/ - -- `types.go` — ClientCredential (149 fields); methods: IsBidTemplate, GetNcpus, GetMemory, String (~4213 tok) - -## src/autoscaler/providers/baidu/src/bcctool/provconst/ - -- `bdConst.go` — Declares var (~311 tok) - -## src/autoscaler/providers/baidu/src/bcctool/provservices/ - -- `provService.go` — GetAvailableTemplates, CreateInstancesFromFile, DeleteInstancesFromFile, SyncInstancesStatusFromFile, GetRequestStatusFromFile (~3661 tok) - -## src/autoscaler/providers/baidu/src/bcctool/utils/ - -- `envvars.go` — InitEnvVars (~696 tok) -- `jsonUtils.go` — LoadProvTemplates, LoadProvConfig, LoadNodeCreationInputFile, LoadGetReturnRequestInputFile + 6 more (~2660 tok) -- `logger.go` — Config (50 fields) (~1649 tok) -- `provUtils.go` — InitProv, ExitWithError, Result, CreationTimeout, TerminationTimeout (~718 tok) - -## src/autoscaler/scaler/ - -- `obj_mgr.c` — include (~3260 tok) -- `plug_mgr.c` — Main functions: (~4412 tok) -- `prov_conf.c` — include "prov_conf.h" (~2721 tok) -- `scaler_ctx.c` — include (~547 tok) -- `scaler_json.c` — include (~3716 tok) -- `scaler_misc.c` — include (~1482 tok) -- `scaler_obj.c` — include "scaler_obj.h" (~2462 tok) -- `scaler.c` — include (~5076 tok) - -## src/autoscaler/scaler/conf/ - -- `hostProviders.json` (~60 tok) -- `hostProviders.yaml` (~35 tok) - -## src/autoscaler/scaler/include/ - -- `obj_mgr.h` — ifndef _OBJ_MGR_H_ (~492 tok) -- `plug_mgr.h` — ifndef _PLUG_MGR_H_ (~119 tok) -- `prov_conf.h` — ifndef _SCALER_CONF_H_ (~132 tok) -- `scaler_ctx.h` — ifndef _SCALER_CTX_H_ (~73 tok) -- `scaler_json.h` — ifndef __JSON_UTILS_H__ (~267 tok) -- `scaler_misc.h` — ifndef _SCALER_MISC_H_ (~203 tok) -- `scaler_obj.h` — ifndef _SCALER_OBJ_H_ (~273 tok) -- `scaler.h` — ifndef _SCALER_H_ (~384 tok) - -## src/autoscaler/scaler/include/scaler/ - -- `types.h` — ifndef _SCALER_TYPES_H_ (~1091 tok) - -## src/autoscaler/scaler/testsuite/ - -- `test_plug_mgr.c` — include (~1794 tok) -- `test_scale_misc.c` — include (~1258 tok) -- `test.c` — include (~97 tok) - -## src/autoscaler/scaler/testsuite/scripts/ - -- `getAvailableTemplates.sh` (~242 tok) -- `getRequestStatus.sh` — Parse command line arguments (~644 tok) -- `getReturnRequests.sh` (~44 tok) -- `requestMachines.sh` (~20 tok) -- `requestReturnMachines.sh` (~38 tok) - -## src/controller/ - -- `.ha.c.~undo-tree~` — Declares xce_cluster_config_t (~40575 tok) -- `apiserver.c` — include (~5303 tok) -- `CLAUDE.md` — XCE Controller (~2630 tok) -- `cluster.c` — include "config.h" (~12336 tok) -- `config_repl.c` — define _GNU_SOURCE (~14877 tok) -- `config_repl.h` — pragma once (~2658 tok) -- `ctrl_metrics.c` — include "ctrl_metrics.h" (~767 tok) -- `dataex.c` — include (~2466 tok) -- `ha.c` — define _GNU_SOURCE (~40638 tok) -- `ha.h` — ifndef HA_H (~10066 tok) -- `job.c` — include (~8259 tok) -- `join.c` — include "config.h" (~2514 tok) -- `main.c` — include (~2262 tok) -- `meson.build` (~1080 tok) -- `misc.c` — include (~1359 tok) -- `myapp.c` — define _GNU_SOURCE (~3831 tok) -- `myconf.c` — define _GNU_SOURCE (~1179 tok) -- `opget.c` — include "config.h" (~1725 tok) -- `opupd.c` — include "config.h" (~714 tok) -- `persist.c` — define _GNU_SOURCE (~14023 tok) -- `queue.c` — include (~1260 tok) -- `repl.c` — include (~4248 tok) -- `reply.c` — include "config.h" (~590 tok) -- `resources.c` — include (~50 tok) -- `sched.c` — include (~5230 tok) -- `startup_validation.c` — define _GNU_SOURCE (~1524 tok) -- `task.c` — include (~1376 tok) -- `worker.c` — include (~5201 tok) - -## src/controller/include/ - -- `cluster.h` — if !defined(_CLUSTER_H_) (~1788 tok) -- `worker.h` — if !defined(_WORKER_H_) (~190 tok) - -## src/controller/testsuite/ - -- `controller_test.c` — include (~1398 tok) -- `test_cluster_persist.c` — define _GNU_SOURCE (~1062 tok) -- `test_config_repl.c` — define _GNU_SOURCE (~23709 tok) -- `test_ctrl_metrics.c` — define _GNU_SOURCE (~940 tok) -- `test_e2e_capnp.c` — include (~1690 tok) -- `test_e2e_checkpoint.c` — define _GNU_SOURCE (~1793 tok) -- `test_e2e_gc.c` — define _GNU_SOURCE (~1665 tok) -- `test_e2e_hooks.c` — define _GNU_SOURCE (~2346 tok) -- `test_e2e_wal.c` — define _GNU_SOURCE (~2546 tok) -- `test_gc_retention.c` — define _GNU_SOURCE (~2447 tok) -- `test_ha_bootstrap_support.c` — ifdef XCE_TESTING (~1080 tok) -- `test_ha_bootstrap.c` — does: defer_config_fetch (~6244 tok) -- `test_ha_cluster.c` — include (~1351 tok) -- `test_ha_connection_reuse.c` — define _GNU_SOURCE (~6320 tok) -- `test_ha_ctrlhello.c` (~1416 tok) -- `test_ha_durability.c` — Declares char (~4366 tok) -- `test_ha_election.c` — Declares char (~11940 tok) -- `test_ha_evaluate_committing.c` — Declares checks (~8203 tok) -- `test_ha_failover.c` — define _GNU_SOURCE (~4051 tok) -- `test_ha_liveness.c` — Declares directly (~6435 tok) -- `test_ha_rdhup_integration.c` — Declares char (~4658 tok) -- `test_ha_redirect.c` — include (~905 tok) -- `test_ha_repl_ack.c` (~3314 tok) -- `test_ha_repl_push.c` — Declares is (~3020 tok) -- `test_ha_role.c` — include (~10563 tok) -- `test_ha_start_election_async.c` — Declares returns (~2097 tok) -- `test_ha_startup.c` — Declares char (~9207 tok) -- `test_ha_vote_gate.c` — define _GNU_SOURCE (~2934 tok) -- `test_ha_vote_send.c` — define _GNU_SOURCE (~6038 tok) -- `test_hooks.c` — include (~365 tok) -- `test_p1_integration.c` — include (~1270 tok) -- `test_p2_integration.c` — include (~2096 tok) -- `test_p3_hardening.c` — define _GNU_SOURCE (~5003 tok) -- `test_p3_manual_failover.c` — include (~984 tok) -- `test_persist_checkpoint.c` — define _GNU_SOURCE (~1815 tok) -- `test_persist_hooks.c` — define _GNU_SOURCE (~4222 tok) -- `test_persist_recovery.c` — define _GNU_SOURCE (~2290 tok) -- `test_persist_repl.c` — include (~1396 tok) -- `test_persist_schema.c` — include (~1190 tok) -- `test_persist_truncate.c` — define _GNU_SOURCE (~2114 tok) -- `test_persist_types.c` — include (~697 tok) -- `test_persist_wal.c` — define _GNU_SOURCE (~1708 tok) -- `test_repl_apply.c` — include (~1862 tok) -- `test_repl_catchup.c` — include (~1183 tok) -- `test_repl_majority.c` — include (~2258 tok) -- `test_repl_unit.c` — include (~1662 tok) -- `test_worker_join.c` — include (~4851 tok) -- `test.c` — include (~18744 tok) - -## src/docs/ - -- `apiserver-backend-enhancement-plan.md` — API Server Backend Enhancement Plan (~18355 tok) -- `apiserver-backend-gaps.md` — API Server Backend Gap Analysis (~3048 tok) -- `apiserver-backend-integration-test-plan.md` — Integration Test Plan — P0 + P1 Features (~5693 tok) -- `apiserver-backend-reviews.md` — Final Cross-Perspective Review — API Server Backend Enhancement Plan (~6046 tok) -- `apiserver-backend-tasks.md` — API Server Backend Enhancement — Task Tracker (~2318 tok) -- `cluster-config-split-analysis.md` — ClusterConfig Schema Split Analysis (~3448 tok) -- `config-replication-design.md` — XCE Controller: Configuration Replication Design (~31261 tok) -- `config-replication-gap-analysis.md` — Config Replication — Gap Analysis: Design vs Implementation (~2674 tok) -- `config-replication-impl-status.md` — Config Replication — Implementation Status (~2258 tok) -- `FUTURE_WORK.md` — XCE Controller: Future Work Items (~1087 tok) -- `p1-2-host-select.md` — P1-2: Host Resource Requirement Select — Investigation (~848 tok) -- `persistence-and-ha-design.md` — XCE Controller: State Persistence & High Availability Design (~98184 tok) -- `phase6-audit.md` — Phase 6 Pre-Audit: Single-Threaded Invariant and Stub Locations (~263 tok) -- `phase6-scheduler-integration-plan.md` — Phase 6 — Scheduler Integration Implementation Plan (~10358 tok) -- `resreq-ast-cse-design.md` — XCE Resource Requirement AST & CSE Design (~47536 tok) -- `resreq-ast-cse-impl-plan.md` — Resreq AST + CSE Implementation Plan (~5843 tok) -- `xce.md` — controller (~192 tok) - -## src/frontend/ - -- `CLAUDE.md` — XCE Frontend (API Server + CLI) (~790 tok) -- `Makefile` — Make build targets (~408 tok) -- `meson.build` (~10 tok) - -## src/frontend/apiserver/ - -- `go.mod` — Go module definition (~844 tok) -- `go.sum` — Go dependency checksums (~5760 tok) -- `meson.build` — frontend/apiserver — Go REST API server with CGO backend integration. (~563 tok) -- `README.md` — Project documentation (~42 tok) - -## src/frontend/apiserver/backend/ - -- `clib.go` — go:build cgo (~3465 tok) -- `config.go` — BackendConfig holds connection parameters for the XCE controller. (~200 tok) -- `control_host_test.go` — go:build !cgo (~211 tok) -- `convert_pure.go` — rawStartInfo (93 fields) (~3096 tok) -- `convert_test.go` — TestRawJobToModel_BasicFields, TestRawJobToModel_NilSubmit, TestRawJobToModel_Timestamps, TestRawWorkerToModel_BasicFields + 14 more (~6770 tok) -- `convert.go` — go:build cgo (~3349 tok) -- `handler_test.go` — TestOnHostConfigUpdated_UnregisteredHostIgnored, TestOnHostConfigUpdated_DefaultPseudoHostIgnored, TestOnHostConfigUpdated_PartialMerge, TestOnClus... (~2994 tok) -- `handler.go` — DefaultHandler (8 fields); methods: OnJobCreated, OnJobUpdated, OnJobDeleted, OnJobFinished (~1054 tok) -- `heartbeat_test.go` — TestSetHeartbeatInterval_ValidValue, TestSetHeartbeatInterval_ZeroIgnored, TestSetHeartbeatInterval_NegativeIgnored, TestRunHeartbeat_CallsFunction... (~593 tok) -- `heartbeat.go` — SetHeartbeatInterval (~289 tok) -- `integration_test.go` — go:build !cgo (~4808 tok) -- `notification.go` — NotificationHandler defines callbacks for backend push events. (~241 tok) -- `peers_test.go` — TestParsePeer (~525 tok) -- `peers.go` (~180 tok) -- `stub_funcs_test.go` — go:build !cgo (~513 tok) -- `stub.go` — go:build !cgo (~455 tok) -- `val_helpers.h` — ifndef VAL_HELPERS_H (~260 tok) - -## src/frontend/apiserver/backend/auth/ - -- `config_file_test.go` — TestConfigFileProvider_Authenticate, TestConfigFileProvider_GetUserRoles, TestConfigFileProvider_Name, TestNewConfigFileProvider_Errors + 3 more (~935 tok) -- `config_file.go` — AuthFileConfig (21 fields); methods: Authenticate, GetUserRoles, Name, AllUsers (~650 tok) -- `init.go` — InitAuthProvider (~280 tok) -- `ldap.go` — LDAPProvider is a stub for future LDAP authentication. (~156 tok) -- `oauth2.go` — OAuth2Provider is a stub for future OAuth2/OIDC authentication. (~162 tok) -- `pam_linux.go` — go:build linux && cgo (~973 tok) -- `pam_stub.go` — go:build !linux || !cgo (~100 tok) -- `pam.go` — PAMProvider authenticates users via the system PAM stack. (~106 tok) -- `provider.go` — UserRoleSeeder is an optional interface for providers that can enumerate all users. (~126 tok) - -## src/frontend/apiserver/cmd/ - -- `main.go` (~973 tok) - -## src/frontend/apiserver/common/ - -- `common.go` (~798 tok) - -## src/frontend/apiserver/config/ - -- `app.yaml` (~519 tok) -- `auth.yaml` — Authentication provider: config_file | pam | ldap | oauth2 (~183 tok) -- `auth.yaml.example` — Authentication provider: config_file | pam | ldap | oauth2 (~151 tok) -- `logger.yaml` (~198 tok) -- `nginx.http.conf` — Declares application (~495 tok) -- `nginx.https.conf` — Declares application (~564 tok) -- `rbac_template.yaml` (~1339 tok) -- `rbac.yaml` (~1087 tok) - -## src/frontend/apiserver/config/schema/ - -- `app_schema.json` (~1044 tok) -- `logger_schema.json` (~905 tok) - -## src/frontend/apiserver/config/ssl/ - -- `openssl.cnf` (~99 tok) -- `server.crt` — ---BEGIN CERTIFICATE----- (~330 tok) -- `server.key` — ---BEGIN PRIVATE KEY----- (~455 tok) - -## src/frontend/apiserver/controllers/ - -- `apikey.go` — APIKeyController (9 fields); methods: GenerateAPIKey (~382 tok) -- `auth.go` — AuthController (43 fields); methods: Logon, Logout (~1898 tok) -- `clusters.go` — ClusterController (31 fields); methods: GetClustersInfo (~1995 tok) -- `files.go` — FilesController (48 fields); methods: UploadFiles, DeleteFiles, GetFileLists (~4864 tok) -- `host_control_test.go` — TestPreCheckHostControlRequest_AllFlag, TestPreCheckHostControlRequest_NotAll, TestPreCheckHostControlRequest_NoRace, TestPreCheckHostControlReques... (~974 tok) -- `hosts.go` — HostHandler (54 fields); methods: GetHostsInfo, GetHostByHostname, FilterHostByResReqSelect, ControlHost (~5390 tok) -- `integration_test.go` — go:build !cgo (~5676 tok) -- `jobs_test.go` — TestPreCheckJobRequest_LostAndFound, TestPreCheckJobRequest_NormalQueue, TestPreCheckJobRequest_EmptyQueue (~640 tok) -- `jobs.go` — JobController (49 fields); methods: GetJobsInfo (~32939 tok) -- `permissions.go` — PermController (2 fields); methods: GetPermsInfo (~167 tok) -- `queue_control_test.go` — TestPreCheckQueueControlRequest_AllFlag, TestPreCheckQueueControlRequest_NotAll, TestPreCheckQueueControlRequest_NoRace, TestPreCheckQueueControlRe... (~984 tok) -- `queue_filter_test.go` — TestQueueFilter_AddedOnce, TestQueueFilter_NotAddedWhenUserSpecified, TestQueueFilter_NoQueues, TestQueueFilter_SingleFilter (~601 tok) -- `queues.go` — QueueController (51 fields); methods: GetQueuesInfo, GetQueueByName (~5525 tok) -- `rbac_check_test.go` — TestLoadRBACConfig_RolesPopulated, TestLoadRBACConfig_UserRoleMappings, TestLoadRBACConfig_RoleIncludes, TestLoadRBACConfig_EmptyRoles + 5 more (~2482 tok) -- `rbac_check.go` — RBACConfig (95 fields) (~3448 tok) -- `rbac_convention_test.go` — TestGetRequireResourcePermission_GoConvention, TestGetRequireResourcePermission_FoundPermission, TestDomainTypeConstants, TestGetAccessQueues_AllDo... (~945 tok) -- `resources.go` — ResourceController (59 fields); methods: GetResourcesDistributionInfo, GetResourcesDefinitionInfo (~3386 tok) -- `response.go` — JsonStruct (13 fields) (~610 tok) -- `roles.go` — RoleController (59 fields); methods: GetRolesInfo, GetRoleByRolename (~6979 tok) -- `users.go` — UserController (57 fields); methods: GetUserPermInfo, GetCurrentUserInfo, GetUserRolesInfo, DeleteRolesForUser (~4662 tok) - -## src/frontend/apiserver/docs/ - -- `docs.go` — Code generated by swaggo/swag. DO NOT EDIT (~2852 tok) -- `swagger.json` (~2652 tok) -- `swagger.yaml` — Declares required (~1177 tok) - -## src/frontend/apiserver/middleware/ - -- `cors_test.go` — TestCORSMiddleware_SetsHeaders, TestCORSMiddleware_Preflight, TestCORSMiddleware_Disabled (~458 tok) -- `cors.go` — CORSMiddleware, CORSOriginsFromConfig (~405 tok) -- `load_test.go` — AuthResponse (28 fields) (~728 tok) -- `rate_limit.go` — RateLimiter (22 fields); methods: Limit (~1044 tok) -- `README` (~7 tok) -- `startserver.go` — StartServer, GetIPAddresses (~813 tok) -- `test_rate_limit.bat` (~59 tok) -- `validatehandler.go` — ValidateHandler (~1013 tok) -- `whitelist_test.go` — TestPathMatchesPattern (~277 tok) -- `whitelist.go` — WhitelistURLMiddleware, WhitelistIPMiddleware (~1369 tok) - -## src/frontend/apiserver/models/ - -- `apikey.go` — APIKeyController (10 fields) (~129 tok) -- `auth.go` — LogonRequest (19 fields) (~224 tok) -- `clusters_test.go` — TestClusterInfo_NewFields, TestClusterInfo_ExistingFieldsUnchanged (~1008 tok) -- `clusters.go` — ClusterInfo (18 fields) (~345 tok) -- `common.go` — ActionControl (6 fields) (~107 tok) -- `files.go` — FileUploadRequest (3 fields) (~42 tok) -- `hosts_test.go` — TestHostStateStr (~424 tok) -- `hosts.go` — HostInfo (39 fields) (~996 tok) -- `jobs_test.go` — TestJobStateStr, TestJobStatMapValues (~623 tok) -- `jobs.go` — JobArrayID (124 fields); methods: IsZero, MarshalJSON, Tm, String (~7102 tok) -- `queues.go` — QueueInfo (21 fields) (~523 tok) -- `resources.go` — ResourceInfo (45 fields); methods: String, String, ToJSON (~801 tok) -- `roles.go` — RoleFields (21 fields) (~652 tok) -- `users.go` — AddRoleForUserRequest (12 fields) (~178 tok) - -## src/frontend/apiserver/router/ - -- `routers.go` — Router (~1891 tok) - -## src/frontend/apiserver/services/ - -- `data_service.go` — QueryData, InsertEntity, DeleteEntity (~1002 tok) -- `job_service.go` — SubmitJob (~73 tok) -- `rbac_service.go` — GetUserPermissions (~225 tok) - -## src/frontend/apiserver/store/ - -- `audit_test.go` — TestNoDanglingReferences, TestNoDBImportsInProductionCode (~1182 tok) -- `concurrency_test.go` — TestIntegration_ConcurrentConfigPushes, TestIntegration_ConcurrentHostControlAndConfigPush, TestIntegration_ConcurrentResourceValuePushes (~832 tok) -- `convert.go` — StructToOrderMap, StructsToOrderMaps, StoreToOrderMaps (~344 tok) -- `query.go` — ExecuteQuery, MatchesCondition, MatchesBitmaskCondition, IsBitmaskField + 4 more (~2568 tok) -- `store_test.go` — TestDataStore_BasicOperations, TestDataStore_ListKeysCount, TestDataStore_Filter, TestDataStore_Range, TestDataStore_ConcurrentAccess (~731 tok) -- `store.go` — DataStore is a generic thread-safe in-memory key-value store. (~572 tok) -- `stores.go` — Global store instances. (~1277 tok) - -## src/frontend/apiserver/tools/encrypt/ - -- `crypter.go` — Encrypt, Decrypt (~792 tok) - -## src/frontend/apiserver/utils/ - -- `cgo_stub.go` — This file is reserved for future CGo bindings to the backend C library. (~70 tok) -- `config_test.go` — TestResolveJWTSecret_EnvOverridesConfig, TestResolveJWTSecret_FallsBackToConfig, TestResolveJWTSecret_EmptyEnvUsesConfig (~224 tok) -- `config.go` — BackendConfig (79 fields) (~2434 tok) -- `crypto.go` — Encrypt, Decrypt (~425 tok) -- `logger.go` — Config (50 fields) (~1608 tok) -- `types.go` — Value (140 fields) (~4160 tok) -- `utils_test.go` — TestIntOrInt64 (~256 tok) -- `utils.go` — FilterCondition (142 fields) (~4853 tok) - -## src/frontend/docs/ - -- `analysis.md` — API Server & Client Analysis (~2870 tok) -- `improvement_suggestions.md` — Code Improvement Suggestions (~1408 tok) -- `improvement_tasks.md` — Code Improvement Tasks (~370 tok) -- `integration_test.md` — Integration Test Report: xcecli ↔ apiserver (~3767 tok) -- `plan_t9_f1_f4.md` — Implementation Plan: T9, F1, F4 (~1039 tok) -- `status.md` — Project Status (~1169 tok) - -## src/frontend/tests/regression/ - -- `run.sh` — Regression test suite: xcecli ↔ apiserver (~1787 tok) - -## src/frontend/xcecli/ - -- `go.mod` — Go module definition (~316 tok) -- `go.sum` — Go dependency checksums (~1783 tok) -- `meson.build` — frontend/xcecli — Go CLI tool (~145 tok) - -## src/frontend/xcecli/cmd/ - -- `main.go` (~561 tok) - -## src/frontend/xcecli/cmd/auth/ - -- `list.go` — NewListCmd (~310 tok) -- `logon.go` — NewLogonCmd (~1692 tok) -- `logout_test.go` — TestRunLogout_WithURL, TestRunLogout_DefaultsToActiveServer, TestRunLogout_NotFound (~435 tok) -- `logout.go` — NewLogoutCmd (~512 tok) - -## src/frontend/xcecli/cmd/auth/cert/ - -- `cert.go` — GeneratorCert, GetCertPath (~639 tok) -- `parser.go` (~221 tok) - -## src/frontend/xcecli/cmd/clusters/ - -- `list.go` — NewClustersCmd (~558 tok) - -## src/frontend/xcecli/cmd/hosts/ - -- `controller.go` — HostController (41 fields); methods: RunHostsControl, ParseCmdArgs (~1382 tok) -- `hosts.go` — NewHostsCmd (~233 tok) -- `list.go` — HostsQuerier (43 fields); methods: ParseCmdArgs, RunHostsList (~1627 tok) -- `select_test.go` — TestParseSelectArgs_RequiresResReq, TestParseSelectArgs_MaxLength, TestParseSelectArgs_Valid (~172 tok) -- `select.go` — HostSelector (24 fields) (~654 tok) - -## src/frontend/xcecli/cmd/jobs/ - -- `controller.go` — JobController (75 fields); methods: RunJobsControl, ParseCmdArgs (~2610 tok) -- `files_test.go` — TestParseFileTransfer_ExplicitOperator, TestParseFileTransfer_PlainPath, TestParseFileTransfer_PlainFilename (~318 tok) -- `files.go` — fileTransfer (28 fields) (~1050 tok) -- `jobs.go` — NewJobsCmd (~307 tok) -- `list.go` — JobsQuerier (99 fields); methods: ParseCmdArgs, RunJobsList (~3826 tok) -- `restart.go` — JobRestart (18 fields); methods: ParseCmdArgs, RunJobsRestart (~570 tok) -- `submit.go` — JobSubmitter (135 fields); methods: ParseCmdArgs, BuildJobRequest, RunJobsSubmit (~6928 tok) - -## src/frontend/xcecli/cmd/permissions/ - -- `list.go` — PermsQuerier (29 fields); methods: ParseCmdArgs, RunPermsList (~954 tok) -- `permissions.go` — NewPermsCmd (~168 tok) - -## src/frontend/xcecli/cmd/queues/ - -- `controller.go` — QueueController (58 fields); methods: RunQueuesControl, ParseCmdArgs (~1933 tok) -- `list.go` — QueuesQuerier (45 fields); methods: ParseCmdArgs, RunQueuesList (~1570 tok) -- `queues.go` — NewQueuesCmd (~247 tok) - -## src/frontend/xcecli/cmd/resources/ - -- `list.go` — ResourcesDistQuerier (79 fields); methods: ParseCmdArgs, ParseCmdArgs, RunResourcesDefList, RunResourcesDistList (~2860 tok) -- `resources.go` — NewResourcesCmd (~478 tok) - -## src/frontend/xcecli/cmd/roles/ - -- `addrole.go` — RoleSubmitter (72 fields); methods: ParseCmdArgs, RunRolesAdd, RunPermsAdd, BuildRoleRequest (~2311 tok) -- `deleterole.go` — DeleteRole (20 fields); methods: ParseCmdArgs, RunDeleteRoleInfo (~642 tok) -- `list_test.go` — TestUniqueRoleNames_NoDuplicates, TestUniqueRoleNames_WithDuplicates, TestUniqueRoleNames_Empty, TestUniqueRoleNames_CrossPage, TestUserRoleNameCol... (~673 tok) -- `list.go` — RolesQuerier (53 fields); methods: ParseCmdArgs, RunRolesInfo (~1767 tok) -- `roles.go` — NewRolesCmd (~234 tok) -- `view.go` — NewViewRolesCmd (~434 tok) - -## src/frontend/xcecli/cmd/users/ - -- `assignrole.go` — UserSubmitter (28 fields); methods: ParseCmdArgs, RunUserAssignRole, BuildUserRequest (~941 tok) -- `list_test.go` — TestUniqueUserNames_NoDuplicates, TestUniqueUserNames_WithDuplicates, TestUniqueUserNames_Empty, TestUniqueUserNames_CrossPage, TestUserRoleNameCol... (~668 tok) -- `list.go` — UserRolesQuerier (62 fields); methods: ParseCmdArgs, RunCurrentUserInfo, RunUserRolesInfo (~2090 tok) -- `perm4user.go` — Perms4User (35 fields); methods: ParseCmdArgs, RunUserPermsInfo (~1149 tok) -- `unassignrole.go` — UnassignUser (25 fields); methods: ParseCmdArgs, RunDeleteUserRoleInfo (~780 tok) -- `users.go` — NewUsersCmd (~305 tok) -- `view.go` — NewViewUserRolesCmd (~435 tok) - -## src/frontend/xcecli/common/format/ - -- `jobid_test.go` — TestFormatJobIDRegular, TestFormatJobIDArray, TestParseJobIDRegular, TestParseJobIDArray + 5 more (~832 tok) -- `jobid.go` — FormatJobID, IsArrayJob, DecomposeJobID, MakeJobID + 4 more (~1758 tok) - -## src/frontend/xcecli/common/output/ - -- `output_clusters.go` — Output (9 fields); methods: SetVerbose, SetNoHeader, SetWideFormat, ClusterPrintData (~317 tok) -- `page_print_array_elements_jobs.go` — ArrayElementsPagePrinter (44 fields); methods: PrepareForPrinting, PrintPage (~1818 tok) -- `page_print_array_jobs.go` — ArrayJobsPagePrinter (42 fields); methods: PrepareForPrinting, PrintPage (~1735 tok) -- `page_print_hosts_test.go` — TestFormatRows_UnavailShowsDashes, TestFormatRows_AvailableShowsValues (~670 tok) -- `page_print_hosts.go` — HostsPagePrinter (75 fields); methods: PrepareForPrinting, PrintPage (~2819 tok) -- `page_print_jobs.go` — JobsPagePrinter (89 fields); methods: PrepareForPrinting, PrintPage (~4288 tok) -- `page_print_queues.go` — QueuesPagePrinter (59 fields); methods: PrepareForPrinting, PrintPage (~2208 tok) -- `page_print_resources.go` — ResourcesPagePrinter (87 fields); methods: PrepareForPrinting, PrintPage (~3232 tok) -- `page_print_roles.go` — RolesPagePrinter (34 fields); methods: PrepareForPrinting, PrintPage (~1440 tok) -- `page_print_users.go` — UserRolesPagePrinter (26 fields); methods: PrepareForPrinting, PrintPage (~1038 tok) -- `page_print.go` — Interface: PagePrinter (12 methods) (~2439 tok) -- `time_test.go` — TestParseJobTime_RFC3339, TestParseJobTime_SpaceFormat, TestParseJobTime_Empty, TestFormatJobTime (~244 tok) -- `time.go` (~334 tok) - -## src/frontend/xcecli/common/request/ - -- `request_test.go` — TestSetRootCAs_HTTPNoOp verifies HTTP clients are not affected. (~429 tok) -- `request.go` — APIResponse (97 fields); methods: SetRootCAs, Logon, GetRequestFromAPIServer, SubmitJob (~2977 tok) - -## src/frontend/xcecli/common/utils/ - -- `utils.go` — SystemLimits (57 fields); methods: GetCPULimit, GetFileLimit, GetDataLimit, GetStackLimit (~2057 tok) - -## src/frontend/xcecli/config/ - -- `config.go` — APIServerInfo (64 fields); methods: Len, Swap, Less, GetConfig (~1607 tok) -- `logger.go` — LoggerConfig (48 fields) (~1877 tok) -- `logger.yaml` (~205 tok) - -## src/include/ - -- `request.h` — if !defined(_REQUEST_H_) (~2674 tok) -- `typemap.h` — if !defined(_TYPEMAP_H_) (~3873 tok) - -## src/lib/ - -- `request.c` — include (~15394 tok) - -## src/lib/testsuite/ - -- `test_wal_wire.c` — include (~2162 tok) - -## src/schema/ - -- `controller.capnp` — Declares OPCode (~8251 tok) +## graphify-out/ + +- `.graphify_labels.json` (~5294 tok) +- `.graphify_root` (~1 tok) +- `GRAPH_REPORT.md` — Graph Report - persistent_ha (2026-06-10) (~44230 tok) +- `manifest.json` (~33884 tok) + +## graphify-out/cache/ + +- `stat-index.json` (~43037 tok) + +## graphify-out/cache/ast/ + +- `005d423b344fb7001a76e9a01e7226b28957f0318f503b6acd0f7f72a3fcde8e.json` (~227 tok) +- `00a5ff6db9d63a87d19ca8b0a68d7105c6ea2fa89be5f94c98b257bced832042.json` (~11282 tok) +- `00bf4ac62988ea0494c2ffda33b92affa91df5763081a54b4c7d6c308fec999e.json` (~269 tok) +- `00ed358e3d7e97d92e2173d4a7e6c435df35f1b8d78f4394232a5cc2bb771e72.json` (~2234 tok) +- `016845199833895f368a40f072564f7b5502cd652cef19f58dffb9c1931bd179.json` (~1092 tok) +- `01c91aa6fa18cc3129d3f6451a04b235c9528a88a165b1b6126f87c37bdc4048.json` (~14877 tok) +- `01d5ae01a90dcbf2812ac05362927a7f9320cd5f20875838057caf559be8c5be.json` (~224 tok) +- `01d75ef42f259e5752e9ee274fc1e00781b485b87349841c5c335ad92ba964b9.json` (~6308 tok) +- `0211c966a13950b059d40d37ff94e62d5b7ba25b554407097e4f964eaac39102.json` (~206 tok) +- `023e107588bcbc8780b5fe90b346a96c5243e9192778aefb9bc9fcd92b5cf692.json` (~3708 tok) +- 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Fix: key_find rv->name in sched->resmgr, put at r->idx", + "fix": "FIXED 2026-06-10: UPDATE_RESVALS now resolves rv->name via key_find on sched->resmgr and writes to r->idx (matching UPDATE_RESVALS_FULL pattern) instead of hardcoding index 0.", "tags": [ "scheduler", "resvals", @@ -5373,7 +5373,7 @@ ], "related_bugs": [], "occurrences": 1, - "last_seen": "2026-06-09T00:00:00Z" + "last_seen": "2026-06-10T17:00:00Z" }, { "id": "bug-336", @@ -5381,7 +5381,7 @@ "error_message": "XCE_SCHED_OP_UPDATE_RESOURCES cannot update existing resources; makeResource returns NULL/EEXIST and return value is silently ignored", "file": "src/scheduler/src/scheduler.c", "root_cause": "makeResource_ in src/lib/resobj.c rejects duplicates with EEXIST; dequeue case ignores NULL return, so 'add or update' (EARS-UB-1.1) is only 'add'", - "fix": "NOT YET FIXED — found during scheduler-controller-msg-gap validation gap analysis (research.md G-2). Fix: on EEXIST mutate existing resource fields and log failures", + "fix": "FIXED 2026-06-10: UPDATE_RESOURCES now checks makeResource return; on NULL (EEXIST) looks up existing resource by name and updates valtype/ordtype/flags/interval fields in place (add-or-update semantics).", "tags": [ "scheduler", "resources", @@ -5392,7 +5392,7 @@ ], "related_bugs": [], "occurrences": 1, - "last_seen": "2026-06-09T00:00:00Z" + "last_seen": "2026-06-10T17:00:00Z" }, { "id": "bug-337", @@ -5762,6 +5762,832 @@ "related_bugs": [], "occurrences": 1, "last_seen": "2026-06-10T03:55:44.698Z" + }, + { + "id": "bug-359", + "timestamp": "2026-06-10T04:16:25.052Z", + "error_message": "Missing guard clause", + "file": "src/scheduler/src/scheduler.c", + "root_cause": "No early return/throw for edge case: r == NULL", + "fix": "Added guard clause: if (r == NULL)", + "tags": [ + "auto-detected", + "guard-clause", + "c" + ], + "related_bugs": [], + "occurrences": 2, + "last_seen": "2026-06-10T04:16:28.320Z" + }, + { + "id": "bug-360", + "timestamp": "2026-06-10T04:17:09.223Z", + "error_message": "Significant refactor of ", + "file": "src/scheduler/src/scheduler.c", + "root_cause": "4 lines replaced/restructured", + "fix": "Rewrote 4→6 lines (4 removed)", + "tags": [ + "auto-detected", + "refactor", + "c" + ], + "related_bugs": [], + "occurrences": 1, + "last_seen": "2026-06-10T04:17:09.223Z" + }, + { + "id": "bug-361", + "timestamp": "2026-06-10T04:47:09.048Z", + "error_message": "Wrong condition in logic", + "file": "src/controller/ha.c", + "root_cause": "Condition was: if (opcode == OPCode_requestVote || opcode == OPCode_p)", + "fix": "Changed to: if (opcode == OPCode_requestVote ||\n opcode)", + "tags": [ + "auto-detected", + "logic-fix", + "c" + ], + "related_bugs": [], + "occurrences": 1, + "last_seen": "2026-06-10T04:47:09.048Z" + }, + { + "id": "bug-353", + "timestamp": "2026-06-10T17:30:00Z", + "error_message": "Config push silently rejected when standby is in CTRL_ELECTING: ha_dispatch_gate only allows requestVote/probeConfigTag, returning -E_XCE_ERR_NOT_READY for all other opcodes. If liveness poll fires during election window, any incoming config push is discarded.", + "file": "src/controller/ha.c", + "root_cause": "CTRL_ELECTING gate in ha_dispatch_gate (ha.c:1464) allowed only vote/probe opcodes. Config push from primary arriving during the ELECTING window (after liveness-poll-triggered failover, before election result) was rejected with -E_XCE_ERR_NOT_READY (10013). Standby never saved config, leaving conf dir empty.", + "fix": "FIXED 2026-06-10: Added OPCode_hello, OPCode_nop, OPCode_replConfigPush, OPCode_walCatchupEntry, OPCode_snapshotTransfer to CTRL_ELECTING allowlist. A campaigning node must accept replication from the current primary to stay current for both win and loss paths. Controller suite green.", + "tags": [ + "ha", + "dispatch-gate", + "election", + "config-replication", + "silent-failure" + ], + "related_bugs": [ + "bug-335", + "bug-336" + ], + "occurrences": 1, + "last_seen": "2026-06-10T17:30:00Z" + }, + { + "id": "bug-363", + "timestamp": "2026-06-10T04:58:30.903Z", + "error_message": "Significant refactor of ", + "file": "src/controller/ha.c", + "root_cause": "4 lines replaced/restructured", + "fix": "Rewrote 9→15 lines (4 removed)", + "tags": [ + "auto-detected", + "refactor", + "c" + ], + "related_bugs": [], + "occurrences": 1, + "last_seen": "2026-06-10T04:58:30.903Z" + }, + { + "id": "bug-364", + "timestamp": "2026-06-10T06:26:24.340Z", + "error_message": "Incorrect value in code", + "file": "src/controller/CLAUDE.md", + "root_cause": "Had `CTRL_ELECTING`", + "fix": "Changed to `CTRL_INIT`", + "tags": [ + "auto-detected", + "wrong-value", + "md" + ], + "related_bugs": [], + "occurrences": 1, + "last_seen": "2026-06-10T06:26:24.340Z" + }, + { + "id": "bug-365", + "timestamp": "2026-06-10T06:32:15.362Z", + "error_message": "Significant refactor of ", + "file": "src/controller/cluster.c", + "root_cause": "3 lines replaced/restructured", + "fix": "Rewrote 8→13 lines (3 removed) | Also: /* Req 4.1: ctrlhello counts as primary activity —; if ((ctrl_role_t)atomic_load_explicit(&c->ha.role,", + "tags": [ + "auto-detected", + "refactor", + "c" + ], + "related_bugs": [], + "occurrences": 2, + "last_seen": "2026-06-10T06:35:56.354Z" + }, + { + "id": "bug-366", + "timestamp": "2026-06-10T06:32:18.661Z", + "error_message": "Significant refactor of ", + "file": "src/controller/config_repl.c", + "root_cause": "3 lines replaced/restructured", + "fix": "Rewrote 6→12 lines (3 removed)", + "tags": [ + "auto-detected", + "refactor", + "c" + ], + "related_bugs": [], + "occurrences": 1, + "last_seen": "2026-06-10T06:32:18.661Z" + }, + { + "id": "bug-367", + "timestamp": "2026-06-10T07:56:21.347Z", + "error_message": "Missing error handling in XCE_TESTING", + "file": "src/controller/testsuite/test_repl_unit.c", + "root_cause": "Code path had no error handling — exceptions would propagate uncaught", + "fix": "Added try/catch block | Also: /* =========================================================; * Task 1.1: repl_broadcast send path tests", + "tags": [ + "auto-detected", + "error-handling", + "c" + ], + "related_bugs": [], + "occurrences": 2, + "last_seen": "2026-06-10T07:57:02.036Z" + }, + { + "id": "bug-368", + "timestamp": "2026-06-10T07:57:40.792Z", + "error_message": "Wrong reference: WAL_JOB should be WAL_JOB_SUBMIT", + "file": "src/controller/testsuite/test_repl_unit.c", + "root_cause": "Used \"WAL_JOB\" instead of \"WAL_JOB_SUBMIT\"", + "fix": "Changed WAL_JOB → WAL_JOB_SUBMIT", + "tags": [ + "auto-detected", + "wrong-reference", + "c" + ], + "related_bugs": [], + "occurrences": 1, + "last_seen": "2026-06-10T07:57:40.792Z" + }, + { + "id": "bug-369", + "timestamp": "2026-06-10T07:58:15.167Z", + "error_message": "Missing error handling in XCE_TESTING", + "file": "src/controller/repl.c", + "root_cause": "Code path had no error handling — exceptions would propagate uncaught", + "fix": "Added try/catch block", + "tags": [ + "auto-detected", + "error-handling", + "c" + ], + "related_bugs": [], + "occurrences": 1, + "last_seen": "2026-06-10T07:58:15.167Z" + }, + { + "id": "bug-370", + "timestamp": "2026-06-10T07:58:38.900Z", + "error_message": "Significant refactor of ", + "file": "src/controller/repl.c", + "root_cause": "3 lines replaced/restructured", + "fix": "Rewrote 42→65 lines (3 removed)", + "tags": [ + "auto-detected", + "refactor", + "c" + ], + "related_bugs": [], + "occurrences": 1, + "last_seen": "2026-06-10T07:58:38.900Z" + }, + { + "id": "bug-371", + "timestamp": "2026-06-10T07:59:24.268Z", + "error_message": "Wrong reference: DEBUG3 should be TRACE", + "file": "src/controller/repl.c", + "root_cause": "Used \"DEBUG3\" instead of \"TRACE\"", + "fix": "Changed DEBUG3 → TRACE", + "tags": [ + "auto-detected", + "wrong-reference", + "c" + ], + "related_bugs": [], + "occurrences": 1, + "last_seen": "2026-06-10T07:59:24.268Z" + }, + { + "id": "bug-372", + "timestamp": "2026-06-10T08:42:26.121Z", + "error_message": "Significant refactor of ", + "file": "src/controller/ha.h", + "root_cause": "3 lines replaced/restructured", + "fix": "Rewrote 12→16 lines (3 removed)", + "tags": [ + "auto-detected", + "refactor", + "h" + ], + "related_bugs": [], + "occurrences": 1, + "last_seen": "2026-06-10T08:42:26.121Z" + }, + { + "id": "bug-373", + "timestamp": "2026-06-10T08:45:30.400Z", + "error_message": "Wrong reference: request should be ep", + "file": "src/controller/cluster.c", + "root_cause": "Used \"request\" instead of \"ep\"", + "fix": "Changed request → ep", + "tags": [ + "auto-detected", + "wrong-reference", + "c" + ], + "related_bugs": [], + "occurrences": 1, + "last_seen": "2026-06-10T08:45:30.400Z" + }, + { + "id": "bug-374", + "timestamp": "2026-06-10T08:47:48.296Z", + "error_message": "Missing error handling in unknown", + "file": "src/controller/testsuite/test_ha_role.c", + "root_cause": "Code path had no error handling — exceptions would propagate uncaught", + "fix": "Added try/catch block | Also: /* Task 3.3 (ha-wal-replication): dispatch gate standby-role; RUN_TEST(test_dispatch_gate_allows_wal_catchup_in_standby_ro", + "tags": [ + "auto-detected", + "error-handling", + "c" + ], + "related_bugs": [], + "occurrences": 2, + "last_seen": "2026-06-10T08:48:00.267Z" + }, + { + "id": "bug-375", + "timestamp": "2026-06-10T08:50:27.397Z", + "error_message": "Missing error handling in struct", + "file": "src/include/typemap.h", + "root_cause": "Code path had no error handling — exceptions would propagate uncaught", + "fix": "Added try/catch block", + "tags": [ + "auto-detected", + "error-handling", + "h" + ], + "related_bugs": [], + "occurrences": 1, + "last_seen": "2026-06-10T08:50:27.397Z" + }, + { + "id": "bug-376", + "timestamp": "2026-06-10T09:17:35.218Z", + "error_message": "Wrong condition in logic", + "file": "src/controller/ha.c", + "root_cause": "Condition was: if (opcode == OPCode_nop)", + "fix": "Changed to: if (rep_s.data_which == RequestReply_data_walackreplym)", + "tags": [ + "auto-detected", + "logic-fix", + "c" + ], + "related_bugs": [], + "occurrences": 1, + "last_seen": "2026-06-10T09:17:35.218Z" + }, + { + "id": "bug-377", + "timestamp": "2026-06-10T09:59:08.979Z", + "error_message": "Missing error handling in XCE_TESTING", + "file": "src/controller/testsuite/test_p2_integration.c", + "root_cause": "Code path had no error handling — exceptions would propagate uncaught", + "fix": "Added try/catch block", + "tags": [ + "auto-detected", + "error-handling", + "c" + ], + "related_bugs": [], + "occurrences": 1, + "last_seen": "2026-06-10T09:59:08.979Z" + }, + { + "id": "bug-378", + "timestamp": "2026-06-10T10:02:00.000Z", + "error_message": "AddressSanitizer: global-buffer-overflow in dataq_enq via xce_wal_batch_req_raw <- repl_broadcast <- persist_wal_async", + "file": "src/controller/testsuite/test_p2_integration.c", + "root_cause": "Tests 8 and 9 declared ep_a/ep_b/g_ep9_a/g_ep9_b as 'static int' (4 bytes) and passed them to repl_add_standby without (void*) cast. repl_broadcast then called xce_wal_batch_req_raw(s->ep, ...) using the stored int* as a real network endpoint, causing an 8-byte read past the 4-byte int. Neither test installed repl_broadcast_send_hook to intercept the call.", + "fix": "Added #include typemap.h; added extern repl_broadcast_send_hook declaration guarded by XCE_TESTING; added p2_drop_send_hook no-op; installed hook around persist_wal_sync_append in tests 8 and 9; fixed missing (void*) casts on all four ep variables", + "tags": [ + "asan", + "global-buffer-overflow", + "repl_broadcast", + "unit-test", + "c" + ], + "related_bugs": [], + "occurrences": 1, + "last_seen": "2026-06-10T10:02:00.000Z" + }, + { + "id": "bug-379", + "timestamp": "2026-06-10T10:36:53.011Z", + "error_message": "Significant refactor of ", + "file": "src/controller/testsuite/test_p2_integration.c", + "root_cause": "4 lines replaced/restructured", + "fix": "Rewrote 50→72 lines (4 removed)", + "tags": [ + "auto-detected", + "refactor", + "c" + ], + "related_bugs": [], + "occurrences": 1, + "last_seen": "2026-06-10T10:36:53.011Z" + }, + { + "id": "bug-380", + "timestamp": "2026-06-10T10:37:21.924Z", + "error_message": "Wrong reference: test_catchup_full_lifecycle_integration should be test_single_node_committed_lsn_unchanged", + "file": "src/controller/testsuite/test_p2_integration.c", + "root_cause": "Used \"test_catchup_full_lifecycle_integration\" instead of \"test_single_node_committed_lsn_unchanged\"", + "fix": "Changed test_catchup_full_lifecycle_integration → test_single_node_committed_lsn_unchanged", + "tags": [ + "auto-detected", + "wrong-reference", + "c" + ], + "related_bugs": [], + "occurrences": 1, + "last_seen": "2026-06-10T10:37:21.924Z" + }, + { + "id": "bug-381", + "timestamp": "2026-06-10T10:37:49.028Z", + "error_message": "Missing error handling in unknown", + "file": "src/controller/testsuite/test_repl_unit.c", + "root_cause": "Code path had no error handling — exceptions would propagate uncaught", + "fix": "Added try/catch block", + "tags": [ + "auto-detected", + "error-handling", + "c" + ], + "related_bugs": [], + "occurrences": 1, + "last_seen": "2026-06-10T10:37:49.028Z" + }, + { + "id": "bug-382", + "timestamp": "2026-06-10T11:54:19.749Z", + "error_message": "Function not marked async", + "file": ".kiro/specs/ha-wal-replication/tasks.md", + "root_cause": "Function uses await but wasn't declared async", + "fix": "Added async modifier", + "tags": [ + "auto-detected", + "async-fix", + "md" + ], + "related_bugs": [], + "occurrences": 1, + "last_seen": "2026-06-10T11:54:19.749Z" + }, + { + "id": "bug-383", + "timestamp": "2026-06-10T14:12:27.285Z", + "error_message": "Significant refactor of ", + "file": ".kiro/steering/product.md", + "root_cause": "5 lines replaced/restructured", + "fix": "Rewrote 13→22 lines (5 removed)", + "tags": [ + "auto-detected", + "refactor", + "md" + ], + "related_bugs": [], + "occurrences": 1, + "last_seen": "2026-06-10T14:12:27.286Z" + }, + { + "id": "bug-384", + "timestamp": "2026-06-10T14:13:01.581Z", + "error_message": "Function not marked async", + "file": ".kiro/steering/tech.md", + "root_cause": "Function uses await but wasn't declared async", + "fix": "Added async modifier", + "tags": [ + "auto-detected", + "async-fix", + "md" + ], + "related_bugs": [], + "occurrences": 1, + "last_seen": "2026-06-10T14:13:01.581Z" + }, + { + "id": "bug-385", + "timestamp": "2026-06-10T14:38:11.810Z", + "error_message": "Significant refactor of ", + "file": "CLAUDE.md", + "root_cause": "4 lines replaced/restructured", + "fix": "Rewrote 5→5 lines (4 removed)", + "tags": [ + "auto-detected", + "refactor", + "md" + ], + "related_bugs": [], + "occurrences": 1, + "last_seen": "2026-06-10T14:38:11.810Z" + }, + { + "id": "bug-386", + "timestamp": "2026-06-10T14:43:53.161Z", + "error_message": "Function not marked async", + "file": "CLAUDE.md", + "root_cause": "Function uses await but wasn't declared async", + "fix": "Added async modifier", + "tags": [ + "auto-detected", + "async-fix", + "md" + ], + "related_bugs": [], + "occurrences": 1, + "last_seen": "2026-06-10T14:43:53.161Z" + }, + { + "id": "bug-387", + "timestamp": "2026-06-10T14:53:19.493Z", + "error_message": "Significant refactor of ", + "file": "src/controller/CLAUDE.md", + "root_cause": "3 lines replaced/restructured", + "fix": "Rewrote 6→5 lines (3 removed) | Also: ### Controllers; - Struct: `type {Resource}Controller struct{}`", + "tags": [ + "auto-detected", + "refactor", + "md" + ], + "related_bugs": [], + "occurrences": 2, + "last_seen": "2026-06-10T14:55:18.463Z" + }, + { + "id": "bug-388", + "timestamp": "2026-06-10T14:54:18.503Z", + "error_message": "Function not marked async", + "file": "src/controller/CLAUDE.md", + "root_cause": "Function uses await but wasn't declared async", + "fix": "Added async modifier", + "tags": [ + "auto-detected", + "async-fix", + "md" + ], + "related_bugs": [], + "occurrences": 2, + "last_seen": "2026-06-10T14:54:53.661Z" + }, + { + "id": "bug-389", + "timestamp": "2026-06-11T02:46:08.749Z", + "error_message": "Wrong reference: signal should be stdio", + "file": "src/lib/delay.c", + "root_cause": "Used \"signal\" instead of \"stdio\"", + "fix": "Changed signal → stdio", + "tags": [ + "auto-detected", + "wrong-reference", + "c" + ], + "related_bugs": [], + "occurrences": 1, + "last_seen": "2026-06-11T02:46:08.749Z" + }, + { + "id": "bug-390", + "timestamp": "2026-06-11T03:30:54.341Z", + "error_message": "Missing error handling in XCE_TESTING", + "file": "src/controller/ha.c", + "root_cause": "Code path had no error handling — exceptions would propagate uncaught", + "fix": "Added try/catch block", + "tags": [ + "auto-detected", + "error-handling", + "c" + ], + "related_bugs": [], + "occurrences": 1, + "last_seen": "2026-06-11T03:30:54.341Z" + }, + { + "id": "bug-391", + "timestamp": "2026-06-11T03:41:14.912Z", + "error_message": "Missing guard clause", + "file": "src/controller/ha.c", + "root_cause": "No early return/throw for edge case: !ha", + "fix": "Added guard clause: if (!ha)", + "tags": [ + "auto-detected", + "guard-clause", + "c" + ], + "related_bugs": [], + "occurrences": 1, + "last_seen": "2026-06-11T03:41:14.912Z" + }, + { + "id": "bug-392", + "timestamp": "2026-06-11T03:46:02.642Z", + "error_message": "Missing guard clause", + "file": "src/controller/persist.c", + "root_cause": "No early return/throw for edge case: sync_rc_out", + "fix": "Added guard clause: if (sync_rc_out)", + "tags": [ + "auto-detected", + "guard-clause", + "c" + ], + "related_bugs": [], + "occurrences": 1, + "last_seen": "2026-06-11T03:46:02.642Z" + }, + { + "id": "bug-393", + "timestamp": "2026-06-11T03:47:03.826Z", + "error_message": "Significant refactor of ", + "file": "src/controller/job.c", + "root_cause": "2 lines replaced/restructured", + "fix": "Rewrote 15→28 lines (2 removed)", + "tags": [ + "auto-detected", + "refactor", + "c" + ], + "related_bugs": [], + "occurrences": 1, + "last_seen": "2026-06-11T03:47:03.826Z" + }, + { + "id": "bug-394", + "timestamp": "2026-06-11T05:09:37.037Z", + "error_message": "Incorrect value in code", + "file": ".kiro/specs/ha-consistency-invariants/research.md", + "root_cause": "Had `persist_truncate_wal_above`", + "fix": "Changed to `restore_job`", + "tags": [ + "auto-detected", + "wrong-value", + "md" + ], + "related_bugs": [], + "occurrences": 1, + "last_seen": "2026-06-11T05:09:37.037Z" + }, + { + "id": "bug-395", + "timestamp": "2026-06-11T05:10:14.835Z", + "error_message": "Significant refactor of ", + "file": ".kiro/specs/ha-consistency-invariants/research.md", + "root_cause": "3 lines replaced/restructured", + "fix": "Rewrote 7→7 lines (3 removed)", + "tags": [ + "auto-detected", + "refactor", + "md" + ], + "related_bugs": [], + "occurrences": 1, + "last_seen": "2026-06-11T05:10:14.835Z" + }, + { + "id": "bug-396", + "timestamp": "2026-06-10T22:45:00-07:00", + "error_message": "Worker job state notifications (OPCode_notify) are permanently lost when the controller dispatch gate rejects them (quorum loss / COMMITTING window): worker never reads replies, never retries, no rejoin resync", + "file": "src/worker/src/controller_connector.c, src/lib/xceapi.c, src/controller/cluster.c", + "root_cause": "xce_notify is enqueue-and-forget (no cbuf_get); error replies dropped via cbuf_tryput -EAGAIN (xcectx.c:304); xcecd_job_finished return ignored (FIXME at xcecd_worker_utils.c:298); xce_join_req carries no running-job state so rejoin cannot resync", + "fix": "NOT YET FIXED - discovered during ha-consistency-invariants gap research; design will add primary-side pending-facts queue (hold uncommitted facts until quorum) + idempotency guards in mark_job_*; see .kiro/specs/ha-consistency-invariants/research.md deep-dive section A", + "tags": [ + "ha", + "notify", + "silent-data-loss", + "worker", + "quorum", + "ha-consistency-invariants" + ], + "related_bugs": [], + "occurrences": 1, + "last_seen": "2026-06-10T22:45:00-07:00" + }, + { + "id": "bug-397", + "timestamp": "2026-06-11T06:34:28.705Z", + "error_message": "Significant refactor of ", + "file": ".kiro/specs/ha-consistency-invariants/requirements.md", + "root_cause": "2 lines replaced/restructured", + "fix": "Rewrote 3→4 lines (2 removed)", + "tags": [ + "auto-detected", + "refactor", + "md" + ], + "related_bugs": [], + "occurrences": 1, + "last_seen": "2026-06-11T06:34:28.705Z" + }, + { + "id": "bug-398", + "timestamp": "2026-06-11T06:35:26.288Z", + "error_message": "Incorrect value in code", + "file": ".kiro/specs/ha-consistency-invariants/research.md", + "root_cause": "Had `restore_job`", + "fix": "Changed to \"irrevocable\"", + "tags": [ + "auto-detected", + "wrong-value", + "md" + ], + "related_bugs": [], + "occurrences": 1, + "last_seen": "2026-06-11T06:35:26.288Z" + }, + { + "id": "bug-399", + "timestamp": "2026-06-11T06:43:14.709Z", + "error_message": "Incorrect value in code", + "file": ".kiro/specs/ha-consistency-invariants/research.md", + "root_cause": "Had 't span syscalls and degrade to serial mode), C ec", + "fix": "Changed to 't span syscalls), C ecosystem dead (libitm unmain", + "tags": [ + "auto-detected", + "wrong-value", + "md" + ], + "related_bugs": [], + "occurrences": 1, + "last_seen": "2026-06-11T06:43:14.709Z" + }, + { + "id": "bug-400", + "timestamp": "2026-06-11T07:23:53.901Z", + "error_message": "Incorrect value in code", + "file": ".kiro/specs/ha-consistency-invariants/research.md", + "root_cause": "Had \"return quickly\"", + "fix": "Changed to `--vcpus`", + "tags": [ + "auto-detected", + "wrong-value", + "md" + ], + "related_bugs": [], + "occurrences": 1, + "last_seen": "2026-06-11T07:23:53.901Z" + }, + { + "id": "bug-401", + "timestamp": "2026-06-11T07:47:34.756Z", + "error_message": "Incorrect value in code", + "file": ".kiro/specs/ha-consistency-invariants/research.md", + "root_cause": "Had `mark_job_*`", + "fix": "Changed to \"pending facts\"", + "tags": [ + "auto-detected", + "wrong-value", + "md" + ], + "related_bugs": [], + "occurrences": 1, + "last_seen": "2026-06-11T07:47:34.756Z" + }, + { + "id": "bug-402", + "timestamp": "2026-06-11T07:53:43.868Z", + "error_message": "Missing error handling in unknown", + "file": ".kiro/specs/ha-consistency-invariants/research.md", + "root_cause": "Code path had no error handling — exceptions would propagate uncaught", + "fix": "Added try/catch block", + "tags": [ + "auto-detected", + "error-handling", + "md" + ], + "related_bugs": [], + "occurrences": 1, + "last_seen": "2026-06-11T07:53:43.868Z" + }, + { + "id": "bug-403", + "timestamp": "2026-06-11T08:34:47.868Z", + "error_message": "Function not marked async", + "file": ".kiro/specs/ha-consistency-invariants/design.md", + "root_cause": "Function uses await but wasn't declared async", + "fix": "Added async modifier", + "tags": [ + "auto-detected", + "async-fix", + "md" + ], + "related_bugs": [], + "occurrences": 1, + "last_seen": "2026-06-11T08:34:47.868Z" + }, + { + "id": "bug-404", + "timestamp": "2026-06-11T08:46:20.815Z", + "error_message": "Missing error handling in unknown", + "file": ".kiro/steering/roadmap.md", + "root_cause": "Code path had no error handling — exceptions would propagate uncaught", + "fix": "Added try/catch block", + "tags": [ + "auto-detected", + "error-handling", + "md" + ], + "related_bugs": [], + "occurrences": 1, + "last_seen": "2026-06-11T08:46:20.815Z" + }, + { + "id": "bug-405", + "timestamp": "2026-06-11T09:47:16.750Z", + "error_message": "Incorrect value in code", + "file": ".kiro/specs/ha-single-leader-role/design.md", + "root_cause": "Had `writable_lsn`", + "fix": "Changed to 's \"", + "tags": [ + "auto-detected", + "wrong-value", + "md" + ], + "related_bugs": [], + "occurrences": 1, + "last_seen": "2026-06-11T09:47:16.750Z" + }, + { + "id": "bug-406", + "timestamp": "2026-06-11T09:49:04.296Z", + "error_message": "Incorrect value in code", + "file": ".kiro/specs/ha-single-leader-role/tasks.md", + "root_cause": "Had \" --exclude-dir=.git --exclude-dir=.kiro --exclude", + "fix": "Changed to \" --exclude-dir=.git --exclude-dir=specs --exclude", + "tags": [ + "auto-detected", + "wrong-value", + "md" + ], + "related_bugs": [], + "occurrences": 1, + "last_seen": "2026-06-11T09:49:04.296Z" + }, + { + "id": "bug-407", + "timestamp": "2026-06-11T10:01:15.181Z", + "error_message": "Incorrect value in code", + "file": ".kiro/specs/ha-commit-barrier-rollout/design.md", + "root_cause": "Had `repl.h`", + "fix": "Changed to `entry_lsn`", + "tags": [ + "auto-detected", + "wrong-value", + "md" + ], + "related_bugs": [], + "occurrences": 1, + "last_seen": "2026-06-11T10:01:15.181Z" + }, + { + "id": "bug-408", + "timestamp": "2026-06-11T10:01:39.424Z", + "error_message": "Incorrect value in code", + "file": ".kiro/specs/ha-convergence-recovery/tasks.md", + "root_cause": "Had `-XCE_ERR_NOT_READY`", + "fix": "Changed to `OPCode_notify`", + "tags": [ + "auto-detected", + "wrong-value", + "md" + ], + "related_bugs": [], + "occurrences": 2, + "last_seen": "2026-06-11T10:02:02.349Z" + }, + { + "id": "bug-409", + "timestamp": "2026-06-11T12:57:17.283Z", + "error_message": "Significant refactor of ", + "file": ".kiro/steering/roadmap.md", + "root_cause": "4 lines replaced/restructured", + "fix": "Rewrote 6→8 lines (4 removed)", + "tags": [ + "auto-detected", + "refactor", + "md" + ], + "related_bugs": [], + "occurrences": 1, + "last_seen": "2026-06-11T12:57:17.283Z" } ] } \ No newline at end of file diff --git a/.wolf/cerebrum.md b/.wolf/cerebrum.md index 6a4ee3b..fa57cf8 100644 --- a/.wolf/cerebrum.md +++ b/.wolf/cerebrum.md @@ -11,6 +11,7 @@ ## Key Learnings - Use `clang-format` for C/C++ formatting; shared config lives at `xce/.clang-format`. +- Logging macros in utils.h: TRACE (= tlog_debug3, verbose), INFO, WARN. There is NO DEBUG3 macro — use TRACE for debug-level logging in repl.c and other controller files. (2026-06-10) - `msg_handler_t` in netio.h is `int (*)(void*)` — NOT `int (*)(endpoint_t*)`. Functions assigned to `ep->msg_handler` must use `void *ep` parameter. (Task 2.2, 2026-05-30) - `xce_request()` is defined in request.c but not declared in request.h; files that need it must add `extern int xce_request(endpoint_t *ep, xce_request_t *req);` locally (pattern from config_repl.c). - Test seam pattern for ha.c XCE_TESTING: declare `int (*hook)(ep, req) = NULL` under `#ifdef XCE_TESTING`, expose as extern in test file, test sets it before calling function under test. Mirrors `xce_retry_send_hook` in request.c. @@ -29,6 +30,7 @@ - vote_ep_ctx_t lifetime (Task 2.4 review fix): do NOT free vctx in vote_ep_err_handler. ep->data (vctx) is also used by vote_reply_msg_handler. Cleanup deferred to ha_election_cleanup() (task 5.1). Freeing in err_handler causes UAF. - timeout_ctx field in ha_elect_ctx_t (Task 2.4 review fix): added void *timeout_ctx field pointing to election_timeout_ctx_t. Set after delay_task_ms succeeds. Allows task 4.1 (quorum-reached path) to cancel the watchdog by setting timeout_ctx->cancelled=1 atomically. +- repl_add_standby idempotency (2026-06-10): scan all MAX_STANDBYS slots for ep match BEFORE the nstandbys guard and empty-slot search. Return the existing slot index immediately on match (no state change). This prevents double-registration when raft_cb_become_leader promotes vote eps and on_standby_connected fires for a reconnecting late-joiner. Covered by test_repl_add_standby_idempotent. - Heartbeat freshness source of truth (2026-06-09): `ha_heartbeat_is_fresh` derives from `ha->last_activity` (whole CLOCK_MONOTONIC seconds, written by ha_on_heartbeat_received, lock-free time_t read). The old `last_heartbeat` timespec field was REMOVED from ha_state_t — do not reintroduce it. The standby vote-deny gate is `role==CTRL_STANDBY && primary_ctrl_fd >= 0 && ha_heartbeat_is_fresh(ha)`; RDHUP resets primary_ctrl_fd to -1 so a standby whose primary died can grant votes immediately even if last_activity is still fresh. - raft_init restore contract (2026-06-09): persistence writes (term, voted_for) as a pair, so `raft_init` must set `voted_for_term = initial_term` when `initial_voted_for != -1`. Leaving it 0 lets a restarted node double-vote in the same term (Election Safety violation). Covered by test_proto_H6. @@ -42,14 +44,30 @@ - [2026-06-04] capnpc-c 1.0.1 has a bug with `:group` inside a `union` when `$C.codecgen` is active: the encode/decode generator emits `d->FIELDNAME` (flat) instead of `d->data.GROUPNAME.FIELDNAME`, AND places the case as dead code after the prior `break`. Do NOT use inline `:group` in a union that has `$C.codecgen`. Instead, define a named outer struct (`struct Foo $C.mapname("foo_t")`) and reference it as a pointer union member. The named struct generates correct `encode_Foo_ptr`/`decode_Foo_ptr` calls. The `read_RequestReply`/`write_RequestReply` wire layer works correctly with groups but the codec layer does not. +- ha-consistency-invariants decomposed into 4 sub-specs (2026-06-11, user decision): umbrella spec keeps requirements/design/research as the authoritative contract (generates NO tasks); implementation via ha-commit-engine → ha-commit-barrier-rollout → ha-single-leader-role (HARD ordering: barrier before COMMITTING removal), with ha-convergence-recovery parallel after engine. Briefs reference umbrella docs with per-spec requirement ID subsets. Dependency order lives in steering/roadmap.md "## Specs (dependency order)" (kiro-spec-batch parseable). Rationale: ~30-38 tasks in one spec exceeds the ~20-task decomposition threshold; phases are independently shippable (each leaves the system no less consistent). +- Commit-first-then-reply contract (2026-06-11, user, ha-consistency-invariants): job/queue/host(worker) control operations MUST follow validate → mutate(provisional) → WAL append → commit_submit(WAIT) → reply. No success reply before commit. Known violators to restructure: do_jobcontrol_op (job.c:921-934, replies with only async WAL), handle_jobdispatch (job.c:459-471, replies before processing — classification pending). handle_jobsubmit is the reference implementation. +- Four design decisions locked (2026-06-11, user, ha-consistency-invariants): (1) fact entries follow pure Raft — log-is-the-queue, append to WAL + retry replication forever, NO commit timeout for facts; (2) crash-loss of uncommitted facts accepted until worker-rejoin-resync lands (strictly better than today); (3) demotion eviction = process SELF-RESTART after truncation (rebuild-in-place only if restart proves disruptive); (4) own-term commit via explicit NO-OP WAL entry at promotion. Rationale: "follow Raft as it has been well verified." +- Fact-vs-request commit semantics (2026-06-11, user decision, ha-consistency-invariants Req 2.2/2.8): job state transitions are REPORTED FACTS, not requests. Request-shaped ops (submit, queue ctrl, config) reject to requester on commit timeout; fact-shaped ops (worker-reported transitions) are retained and retried until committed — including across quorum loss; primary never discards an uncommitted fact while running+leading. Backstop for facts never received / lost across failover: worker-rejoin-resync (roadmap backlog, designated official backstop). +- vcpus is operator tuning, not a spec constant (2026-06-11, user): `--vcpus` should be sized per deployment by host capability + cluster size + workload; 8 is only the fallback default. Specs/designs must express thread-pool-relative mechanisms as functions of n_vcpus, never absolute counts, and put sizing advice in operator docs. +- vtask pool sizing facts (verified 2026-06-11): default is 8 (NOT 4 — ha-async-io.md was stale, now fixed) via `--vcpus` CLI override, cluster.c:1082. WAL ACK processing runs on the IOMGR thread (`peer_ctrl_msg_handler` → `repl_ack_decode_and_dispatch` → `repl_on_ack`, ha.c:2770-2792) — so blocking commit-waits on vtask threads can never deadlock their own wakeups; all-workers-blocked is a throughput problem only. Pool size should scale with write concurrency/cores, NOT with n_peers (ACKs gather in parallel; Little's law). Mitigation pattern: commit-wait admission cap (n_vcpus - K), async continuation as durable fix. +- xzarray COW shadow is DORMANT infrastructure (discovered 2026-06-11): `xzarray_freeze`/`xzarray_thaw` (zarray.c:695-757) are built, in the varray vtable, unit-tested (test_zarray_cow.c) — but have ZERO production callers (kvmgr.c:297 `vfreeze = NULL /* wired in P0-2 */`). It is slot-level STRUCTURAL COW only: slots hold item pointers, so in-place field mutations are visible through both shadow and active views; freeze is O(1) pointer swap, reads merge active-over-shadow, thaw merges back with a `should_retain` GC filter, single generation (-EALREADY on double freeze). Intended consumer: the never-implemented entity-bearing checkpoint (Task 11 / sentinel-only snapshots). + ## Decision Log +- Recovery-oriented reframing supersedes ARIES/undo direction (2026-06-10, user insight, ha-consistency-invariants): replication here serves FAILOVER/RECOVERY, not transactions. Structural fact: a single-writer leader never truncates its own log while leader, so provisional in-memory state on a live primary either commits later or the node is demoted — discard coincides exactly with role/lifecycle events. Therefore NO per-entry undo log; discard handled by recovery mechanics (truncate divergent suffix + coarse rebuild via existing persist_recover/replay_wal at demotion/rejoin). Only the watermark egress filter survives (entity WAL-LSN tag, committed-only export to dataex/scheduler) — justified as failover correctness (prevent orphan dispatch), not isolation. Also: Raft commitIndex is volatile — prefer leader-driven log reconciliation at rejoin over persisting committed_lsn. +- STM evaluated and rejected for provisional-state mechanism (2026-06-10, ha-consistency-invariants): user asked if STM could help; analysis concluded full STM is a mismatch (commit point = majority network ACK up to seconds — STM transactions can't span syscalls; libitm/TSX dead in C; single-writer + RTTI per-object locks already cover the concurrency). Adopted the useful subset instead: "committed-view + undo log" (ARIES/MVCC-lite) — entities tagged with WAL LSN, committed-only egress filter for dataex/scheduler, per-in-flight undo records for prompt rollback on abort. Dual-zarray COW checkpoint mechanism is the in-house precedent for maintaining a second consistent view. +- Provisional-state model for Req 2.4 (2026-06-10, user decision, ha-consistency-invariants): in-memory controller state is a PROVISIONAL materialized view; the persisted majority-committed WAL (+snapshot) is the authoritative cluster state. Chosen over hook inversion (apply-after-commit). Mutation order stays mutate-first; instead, commit gates (1) requester confirmation and (2) irrevocable-action egress — dataex/scheduler export must filter uncommitted entities (closes the dispatch-of-uncommitted-job race). Status queries MAY observe provisional state (documented deviation; read consistency out of scope). Consequence: §C convergence/reconciliation work (truncate-on-demotion, phantom eviction, persisted committed_lsn) is mandatory core, not optional — "provisional" is only true if something discards it. +- Raft + CP adopted as governing HA model (2026-06-10, user decision, supersedes "No Raft" in product.md): consistency requirements are DEDUCED from the Raft paper + CP, not chosen per-feature. Concretely: (1) no CTRL_PRIMARY_COMMITTING state — Raft has only Follower/Candidate/Leader; new-leader safety comes from the own-term commit rule (§5.4.2), not a fourth state; (2) majority ACK is the hard commit barrier for ALL state-changing writes — reject on timeout/quorum loss, never local-apply-and-degrade (committed_lsn ≈ commitIndex); (3) replication fans out to all standbys with leader-driven continuous catch-up; majority is the commit threshold, not the fan-out target. Single-writer log retained as XCE's simplification. Spec: .kiro/specs/ha-consistency-invariants/brief.md. Implementation ordering constraint: universal commit barrier MUST land before removing COMMITTING. + - Replication payload wire format (2026-06-09, ha-repl-hardening 7.1): chose the established `_raw` sender convention (manual capnp build via capn_new_list8/capn_setv8 + xce_decode per-opcode raw extraction into raw_payload/raw_payload_len struct fields) over extending the typemap codegen to map capnp Data ↔ raw buffers. Rationale: replConfigPush/upgradeConfig already prove the pattern in production; the codegen route risks regressions across all opcodes and fights the known capnpc-c 1.0.1 codecgen bugs. Schema change: Request.body union gained walcatchupentrymsg @28 / snapshottransfermsg @29 — these messages previously had NO union arm at all (sent as body_which=nomsg, i.e. nothing crossed the wire). - Convergence threshold (2026-06-09, ha-repl-hardening 7.5): chose requirements.md Req 2.3 formula — ceil(n_peers/2)−1 converged standbys (integer form n_peers/2) — over the code's previous all-standbys rule. Rationale: primary + converged standbys form a cluster majority, matching Raft quorum; committed entries are already on a majority per-entry, and safe_committed_lsn derives from a majority of voters, so promotion with one dead minority standby is safe and avoids a 60s degraded-mode timeout. Lagging standbys keep catching up via the heartbeat decision loop after promotion. - Election liveness fix (2026-06-09): `skip_election` path in myapp.c had two bugs: (1) `voted_for_name != ""` triggered even for self-votes and stale terms — fixed by adding `strcmp(name,"self")!=0 && voted_for_term==ha->term`; (2) `ha_arm_heartbeat_timeout_vtask` was never called in skip_election path — fixed by adding arm call after role=CTRL_STANDBY. raft.c Step 4 simplified to term-only deny (same-candidate idempotent re-grant preserved). ha.c `handle_request_vote_req` also simplified to term-only deny. - CORRECTION (2026-06-09 validation pass): the ha.c "term-only deny" part was WRONG — it denied same-candidate re-grants, diverging from raft.c and failing tests. Reverted to deny-different-candidate-only (see Do-Not-Repeat). The myapp.c "self" check was also incomplete — production self-votes are persisted under the node's real name, so the check now also compares myconf->name. -- Task 4.1 (ha_elect_evaluate_and_signal COMMITTING path): Added cluster_t *c field to ha_elect_ctx_t so evaluate can call cluster_init_phase2 without signature change. election_timeout_ctx_t and committing_timeout_ctx_t must be defined BEFORE ha_elect_evaluate_and_signal. cluster_init_phase2 wrapped in #ifndef XCE_TESTING to avoid linker error (cluster.c not in unit-test binary). ha_phase2_hook seam used in XCE_TESTING builds. On PRIMARY: cancel election timeout watchdog, call phase2 if first_boot, set CTRL_PRIMARY_COMMITTING, reset repl_ack_count=0, arm committing_timeout_fn. On STANDBY: call phase2 if first_boot, set CTRL_STANDBY. \ No newline at end of file +- Task 4.1 (ha_elect_evaluate_and_signal COMMITTING path): Added cluster_t *c field to ha_elect_ctx_t so evaluate can call cluster_init_phase2 without signature change. election_timeout_ctx_t and committing_timeout_ctx_t must be defined BEFORE ha_elect_evaluate_and_signal. cluster_init_phase2 wrapped in #ifndef XCE_TESTING to avoid linker error (cluster.c not in unit-test binary). ha_phase2_hook seam used in XCE_TESTING builds. On PRIMARY: cancel election timeout watchdog, call phase2 if first_boot, set CTRL_PRIMARY_COMMITTING, reset repl_ack_count=0, arm committing_timeout_fn. On STANDBY: call phase2 if first_boot, set CTRL_STANDBY. +- (2026-06-11, ha-convergence-recovery spec) `repl_complete_catchup` (repl.c:521) has NO production caller — `in_catch_up` is set by broadcast-overflow eviction (repl.c:240) and never cleared; re-inclusion trigger is wired by the ACK-driven catch-up continuation. +- (2026-06-11) Scheduler-bound job egress has TWO seams, not one: full push `xcesched_push_jobs` (sched.c:169, on scheduler join) AND incremental JOB_NEW push `sched_job_new_fun`→`xcesched_push_joblist` (sched.c:236-248). Status reads (apiserver.c:83, opget.c:173) share `collect_jobs` (dataex.c:294) and must stay unfiltered per umbrella deviation. +- (2026-06-11) No saved-argv/execv machinery exists anywhere in src/controller or src/lib — demotion self-restart is net-new; `job_t` is a thin wrapper `{ xce_job_t job; }` at src/include/xce/types.h:483-485 (controller-local fields go on the wrapper, wire type untouched). diff --git a/.wolf/cron-state.json b/.wolf/cron-state.json index 4ba0c04..32d9b38 100644 --- a/.wolf/cron-state.json +++ b/.wolf/cron-state.json @@ -1,5 +1,5 @@ { - "last_heartbeat": "2026-06-10T04:06:28.742Z", + "last_heartbeat": "2026-06-11T12:56:32.350Z", "engine_status": "running", "execution_log": [ { @@ -200,6 +200,95 @@ "status": "success", "timestamp": "2026-06-10T01:00:00.580Z", "duration_ms": 50 + }, + { + "task_id": "anatomy-rescan", + "status": "success", + "timestamp": "2026-06-10T07:00:00.203Z", + "duration_ms": 77 + }, + { + "task_id": "memory-consolidation", + "status": "success", + "timestamp": "2026-06-10T09:00:00.338Z", + "duration_ms": 2 + }, + { + "task_id": "memory-consolidation", + "status": "success", + "timestamp": "2026-06-10T09:17:09.247Z", + "duration_ms": 1 + }, + { + "task_id": "cerebrum-reflection", + "status": "failed", + "timestamp": "2026-06-10T09:19:23.180Z", + "duration_ms": 122206, + "error": "claude -p failed: spawnSync /bin/sh ETIMEDOUT" + }, + { + "task_id": "cerebrum-reflection", + "status": "failed", + "timestamp": "2026-06-10T09:21:25.363Z", + "duration_ms": 122181, + "error": "claude -p failed: spawnSync /bin/sh ETIMEDOUT" + }, + { + "task_id": "project-suggestions", + "status": "failed", + "timestamp": "2026-06-10T11:06:51.759Z", + "duration_ms": 122186, + "error": "claude -p failed: spawnSync /bin/sh ETIMEDOUT" + }, + { + "task_id": "project-suggestions", + "status": "failed", + "timestamp": "2026-06-10T11:10:56.094Z", + "duration_ms": 244332, + "error": "claude -p failed: spawnSync /bin/sh ETIMEDOUT" + }, + { + "task_id": "project-suggestions", + "status": "failed", + "timestamp": "2026-06-10T11:10:56.094Z", + "duration_ms": 122130, + "error": "claude -p failed: spawnSync /bin/sh ETIMEDOUT" + }, + { + "task_id": "anatomy-rescan", + "status": "success", + "timestamp": "2026-06-10T13:00:00.551Z", + "duration_ms": 41 + }, + { + "task_id": "anatomy-rescan", + "status": "success", + "timestamp": "2026-06-10T19:00:00.364Z", + "duration_ms": 25 + }, + { + "task_id": "anatomy-rescan", + "status": "success", + "timestamp": "2026-06-11T01:00:00.149Z", + "duration_ms": 27 + }, + { + "task_id": "anatomy-rescan", + "status": "success", + "timestamp": "2026-06-11T07:00:00.342Z", + "duration_ms": 33 + }, + { + "task_id": "memory-consolidation", + "status": "success", + "timestamp": "2026-06-11T09:00:00.463Z", + "duration_ms": 3 + }, + { + "task_id": "anatomy-rescan", + "status": "success", + "timestamp": "2026-06-11T13:00:00.757Z", + "duration_ms": 39 } ], "dead_letter_queue": [], diff --git a/.wolf/daemon.log b/.wolf/daemon.log index 3626434..96921ae 100644 --- a/.wolf/daemon.log +++ b/.wolf/daemon.log @@ -111,3 +111,37 @@ [2026-06-10T00:20:16.188Z] [ERROR] Task Cerebrum reflection failed (attempt 1): claude -p failed: Exit code 1: SessionEnd hook [export PATH="$($SHELL -lc 'echo $PATH' 2>/dev/null):$PATH"; _R="${CLAUDE_PLUGIN_ROOT}"; [ -z "$_R" ] && _R=$(ls -dt $HOME/.claude/plugins/cache/thedotmack/claude-mem/[0-9]*/ 2>/dev/null | head -1); _R="${_R%/}"; [ -z "$_R" ] && _R="$HOME/.claude/plugins/marketplaces/thedotmack/plugin"; node "$_R/scripts/bun-runner.js" "$_R/scripts/worker-service.cjs" hook claude-code session-complete] failed: Hook cancelled [2026-06-10T01:00:00.530Z] [INFO] Executing task: Full anatomy rescan [2026-06-10T01:00:00.580Z] [INFO] Task Full anatomy rescan completed in 50ms +[2026-06-10T07:00:00.126Z] [INFO] Executing task: Full anatomy rescan +[2026-06-10T07:00:00.204Z] [INFO] Task Full anatomy rescan completed in 77ms +[2026-06-10T09:00:00.335Z] [INFO] Executing task: Consolidate old memory +[2026-06-10T09:00:00.338Z] [INFO] Task Consolidate old memory completed in 2ms +[2026-06-10T09:16:02.961Z] [INFO] WebSocket client connected +[2026-06-10T09:17:09.246Z] [INFO] Executing task: Consolidate old memory +[2026-06-10T09:17:09.248Z] [INFO] Task Consolidate old memory completed in 1ms +[2026-06-10T09:17:20.973Z] [INFO] Executing task: Cerebrum reflection +[2026-06-10T09:19:23.179Z] [ERROR] Task Cerebrum reflection failed (attempt 1): claude -p failed: spawnSync /bin/sh ETIMEDOUT +[2026-06-10T09:19:23.181Z] [INFO] Executing task: Cerebrum reflection +[2026-06-10T09:21:25.362Z] [ERROR] Task Cerebrum reflection failed (attempt 1): claude -p failed: spawnSync /bin/sh ETIMEDOUT +[2026-06-10T09:21:25.366Z] [INFO] WebSocket client connected +[2026-06-10T09:21:25.366Z] [INFO] WebSocket client connected +[2026-06-10T09:21:30.087Z] [INFO] WebSocket client connected +[2026-06-10T09:30:07.203Z] [INFO] WebSocket client connected +[2026-06-10T11:02:56.697Z] [INFO] WebSocket client connected +[2026-06-10T11:04:49.573Z] [INFO] Executing task: AI suggestions +[2026-06-10T11:06:51.759Z] [ERROR] Task AI suggestions failed (attempt 1): claude -p failed: spawnSync /bin/sh ETIMEDOUT +[2026-06-10T11:06:51.761Z] [INFO] Executing task: AI suggestions +[2026-06-10T11:08:53.964Z] [INFO] Executing task: AI suggestions +[2026-06-10T11:10:56.093Z] [ERROR] Task AI suggestions failed (attempt 1): claude -p failed: spawnSync /bin/sh ETIMEDOUT +[2026-06-10T11:10:56.094Z] [ERROR] Task AI suggestions failed (attempt 1): claude -p failed: spawnSync /bin/sh ETIMEDOUT +[2026-06-10T13:00:00.509Z] [INFO] Executing task: Full anatomy rescan +[2026-06-10T13:00:00.551Z] [INFO] Task Full anatomy rescan completed in 41ms +[2026-06-10T19:00:00.339Z] [INFO] Executing task: Full anatomy rescan +[2026-06-10T19:00:00.364Z] [INFO] Task Full anatomy rescan completed in 25ms +[2026-06-11T01:00:00.122Z] [INFO] Executing task: Full anatomy rescan +[2026-06-11T01:00:00.149Z] [INFO] Task Full anatomy rescan completed in 27ms +[2026-06-11T07:00:00.309Z] [INFO] Executing task: Full anatomy rescan +[2026-06-11T07:00:00.343Z] [INFO] Task Full anatomy rescan completed in 33ms +[2026-06-11T09:00:00.460Z] [INFO] Executing task: Consolidate old memory +[2026-06-11T09:00:00.463Z] [INFO] Task Consolidate old memory completed in 3ms +[2026-06-11T13:00:00.718Z] [INFO] Executing task: Full anatomy rescan +[2026-06-11T13:00:00.757Z] [INFO] Task Full anatomy rescan completed in 39ms diff --git a/.wolf/hooks/_session.json b/.wolf/hooks/_session.json index baf5670..23a6d34 100644 --- a/.wolf/hooks/_session.json +++ b/.wolf/hooks/_session.json @@ -1,108 +1,1004 @@ { - "session_id": "session-2026-06-10-2005", - "started": "2026-06-10T03:05:15.158Z", + "session_id": "session-2026-06-11-2058", + "started": "2026-06-11T03:58:17.303Z", "files_read": { - 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".kiro/specs/ha-single-leader-role/design.md": 2, + ".kiro/specs/ha-single-leader-role/tasks.md": 2 }, - "anatomy_hits": 4, - "anatomy_misses": 3, - "repeated_reads_warned": 5, + "anatomy_hits": 50, + "anatomy_misses": 22, + "repeated_reads_warned": 135, "cerebrum_warnings": 0, - "stop_count": 9 + "stop_count": 23 } \ No newline at end of file diff --git a/.wolf/memory.md b/.wolf/memory.md index 4acec8a..68f519d 100644 --- a/.wolf/memory.md +++ b/.wolf/memory.md @@ -2,6 +2,10 @@ > Chronological action log. Hooks and AI append to this file automatically. > Old sessions are consolidated by the daemon weekly. +| 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 | +| 11:28 | Tasks 5.1-5.3 (ha-wal-replication): added test_repl_registration_lifecycle covering all 3 lifecycle steps (register→ep check, duplicate idempotent, deregister→ep==NULL); tasks 5.1+5.2 already covered by existing tests; 18 Tests 0 Failures in repl unit suite | test_repl_unit.c | GREEN | ~80 | +| 10:30 | Task 4.2-fix (ha-wal-replication): fixed 3 reviewer defects — (1) test_committed_lsn_advances_after_majority_ack: changed assertion from committed>0 to committed_after>committed_before||committed_after==written_lsn (fresh persist has written_lsn=0); (2) added test_single_node_committed_lsn_unchanged documenting -ENODEV degraded behavior (Req 4.4 note); (3) fixed test_wal_nack_does_not_update_acked_lsn: quorum math shows self-count alone satisfies n_active=1 quorum, returns 0 not -ETIMEDOUT | test_p2_integration.c, test_repl_unit.c | GREEN: 308 PASS 0 FAIL | ~180 | +| 08:02 | Task 1.1 (ha-wal-replication): filled repl_broadcast send path — removed stub (void)payload; for each non-catch-up standby builds stack wal_catchup_entry_t and calls xce_wal_batch_req_raw; added XCE_TESTING hook repl_broadcast_send_hook; 5 new tests in test_repl_unit.c all GREEN; full controller suite 1/1 OK ASAN | repl.c, test_repl_unit.c | GREEN | ~300 | | 09:45 | Fixed election liveness: (1) raft.c step-4 deny is now term-only (same-candidate idempotent re-grant preserved); (2) ha.c vote gate also term-only; (3) myapp.c skip-election guard adds voted_for_name!="self" + voted_for_term==term; (4) watchdog armed after skip_election | raft.c, ha.c, myapp.c | FIXED | ~200 | | 09:12 | Task 6.6 residual fix: removed double-free in ha_disarm_heartbeat_timeout_vtask (line 3424 free(ctx) removed); deferred free now handled solely by liveness_poll_fn; build+tests GREEN | ha.c | FIXED | ~80 | | 09:45 | Fix test_proto_B5_idempotent_same_candidate: modified raft_on_vote_request Step 4 to allow idempotent re-grant when same candidate re-requests vote in same term; different candidate still denied; all tests GREEN | lib/raft/raft.c | FIXED | ~60 | @@ -113,7 +117,7 @@ > Consolidated session (0 actions) ## Session: 2026-05-27 20:22 -> Consolidated session (20 actions) +> Consolidated session (0 actions) ## Session: 2026-05-27 21:13 > Consolidated session (0 actions) @@ -122,16 +126,16 @@ > Consolidated session (0 actions) ## Session: 2026-05-27 21:31 -> Consolidated session (26 actions) +> Consolidated session (0 actions) ## Session: 2026-05-27 01:24 -> Consolidated session (4 actions) +> Consolidated session (0 actions) ## Session: 2026-05-27 02:44 -> Consolidated session (2 actions) +> Consolidated session (0 actions) ## Session: 2026-05-27 03:01 -> Consolidated session (2 actions) +> Consolidated session (0 actions) ## Session: 2026-05-27 16:13 > Consolidated session (0 actions) @@ -149,399 +153,103 @@ > Consolidated session (0 actions) ## Session: 2026-05-27 16:46 -> Consolidated session (1 actions) +> Consolidated session (0 actions) ## Session: 2026-05-28 17:18 -> Consolidated session (16 actions) +> Consolidated session (0 actions) ## Session: 2026-05-28 20:10 -> Consolidated session (52 actions) +> Consolidated session (0 actions) ## Session: 2026-05-28 22:03 -> Consolidated session (8 actions) +> Consolidated session (0 actions) ## Session: 2026-05-28 22:28 -> Consolidated session (6 actions) +> Consolidated session (0 actions) ## Session: 2026-05-28 23:58 -> Consolidated session (52 actions) +> Consolidated session (0 actions) ## Session: 2026-05-28 02:51 -> Consolidated session (7 actions) +> Consolidated session (0 actions) ## Session: 2026-05-28 06:00 -> Consolidated session (172 actions) +> Consolidated session (0 actions) ## Session: 2026-05-29 09:01 -> Consolidated session (197 actions) +> Consolidated session (0 actions) ## Session: 2026-05-30 03:09 -> Consolidated session (89 actions) +> Consolidated session (0 actions) ## Session: 2026-05-30 06:35 -> Consolidated session (100 actions) +> Consolidated session (0 actions) ## Session: 2026-05-31 21:27 -> Consolidated session (175 actions) +> Consolidated session (0 actions) ## Session: 2026-05-31 04:53 -> Consolidated session (40 actions) +> Consolidated session (0 actions) ## Session: 2026-06-01 17:07 -> Consolidated session (94 actions) +> Consolidated session (0 actions) ## Session: 2026-06-01 01:10 -> Consolidated session (103 actions) +> Consolidated session (0 actions) ## Session: 2026-06-02 19:50 - -| Time | Action | File(s) | Outcome | ~Tokens | -|------|--------|---------|---------|--------| +> Consolidated session (0 actions) ## Session: 2026-06-02 19:51 - -| Time | Action | File(s) | Outcome | ~Tokens | -|------|--------|---------|---------|--------| +> Consolidated session (0 actions) ## Session: 2026-06-02 20:12 - -| Time | Action | File(s) | Outcome | ~Tokens | -|------|--------|---------|---------|--------| +> Consolidated session (0 actions) ## Session: 2026-06-02 20:14 - -| Time | Action | File(s) | Outcome | ~Tokens | -|------|--------|---------|---------|--------| +> Consolidated session (0 actions) ## Session: 2026-06-02 23:48 - -| Time | Action | File(s) | Outcome | ~Tokens | -|------|--------|---------|---------|--------| -| 00:38 | Created .kiro/specs/ha-heartbeat-liveness/research.md | — | ~2135 | -| 00:42 | Session end: 1 writes across 1 files (research.md) | 7 reads | ~59761 tok | +> Consolidated session (0 actions) ## Session: 2026-06-02 00:57 - -| Time | Action | File(s) | Outcome | ~Tokens | -|------|--------|---------|---------|--------| +> Consolidated session (0 actions) ## Session: 2026-06-02 01:16 - -| Time | Action | File(s) | Outcome | ~Tokens | -|------|--------|---------|---------|--------| +> Consolidated session (0 actions) ## Session: 2026-06-02 01:28 - -| Time | Action | File(s) | Outcome | ~Tokens | -|------|--------|---------|---------|--------| +> Consolidated session (0 actions) ## Session: 2026-06-02 02:05 - -| Time | Action | File(s) | Outcome | ~Tokens | -|------|--------|---------|---------|--------| +> Consolidated session (0 actions) ## Session: 2026-06-02 18:06 - -| Time | Action | File(s) | Outcome | ~Tokens | -|------|--------|---------|---------|--------| +> Consolidated session (0 actions) ## Session: 2026-06-02 18:08 - -| Time | Action | File(s) | Outcome | ~Tokens | -|------|--------|---------|---------|--------| +> Consolidated session (0 actions) ## Session: 2026-06-02 03:20 - -| Time | Action | File(s) | Outcome | ~Tokens | -|------|--------|---------|---------|--------| -| 03:58 | Created src/controller/testsuite/test_ha_liveness_sigstop.sh | — | ~2606 | +> Consolidated session (0 actions) ## Session: 2026-06-02 05:36 - -| Time | Action | File(s) | Outcome | ~Tokens | -|------|--------|---------|---------|--------| +> Consolidated session (0 actions) ## Session: 2026-06-03 18:41 - -| Time | Action | File(s) | Outcome | ~Tokens | -|------|--------|---------|---------|--------| +> Consolidated session (0 actions) ## Session: 2026-06-03 20:57 - -| Time | Action | File(s) | Outcome | ~Tokens | -|------|--------|---------|---------|--------| -| 21:13 | Created src/tools/test-heartbeat-tolerance.sh | — | ~2377 | -| 21:15 | Created .kiro/specs/ha-heartbeat-liveness/manual-tests.md | — | ~1841 | -| 21:16 | Edited .kiro/specs/ha-heartbeat-liveness/tasks.md | inline fix | ~20 | -| 21:20 | Session end: 3 writes across 3 files (test-heartbeat-tolerance.sh, manual-tests.md, tasks.md) | 12 reads | ~47347 tok | -| 21:35 | Session end: 3 writes across 3 files (test-heartbeat-tolerance.sh, manual-tests.md, tasks.md) | 17 reads | ~58880 tok | -| 22:20 | Edited .kiro/specs/ha-config-bootstrap/research.md | added error handling | ~1442 | -| 22:22 | Session end: 4 writes across 4 files (test-heartbeat-tolerance.sh, manual-tests.md, tasks.md, research.md) | 20 reads | ~70722 tok | -| 22:25 | Edited .kiro/specs/ha-config-bootstrap/tasks.md | inline fix | ~19 | -| 22:25 | Edited .kiro/specs/ha-config-bootstrap/tasks.md | inline fix | ~14 | -| 22:25 | Edited .kiro/specs/ha-config-bootstrap/tasks.md | inline fix | ~17 | -| 22:25 | Edited .kiro/specs/ha-config-bootstrap/tasks.md | inline fix | ~20 | -| 22:25 | Edited .kiro/specs/ha-config-bootstrap/tasks.md | inline fix | ~16 | -| 22:25 | Edited .kiro/specs/ha-config-bootstrap/tasks.md | inline fix | ~16 | -| 22:25 | Edited .kiro/specs/ha-config-bootstrap/tasks.md | inline fix | ~14 | -| 22:25 | Edited .kiro/specs/ha-config-bootstrap/tasks.md | inline fix | ~16 | -| 22:26 | Edited .kiro/specs/ha-config-bootstrap/tasks.md | inline fix | ~18 | -| 22:26 | Edited .kiro/specs/ha-config-bootstrap/tasks.md | inline fix | ~16 | -| 23:04 | Edited .kiro/specs/ha-config-bootstrap/tasks.md | inline fix | ~11 | -| 23:05 | Session end: 15 writes across 4 files (test-heartbeat-tolerance.sh, manual-tests.md, tasks.md, research.md) | 22 reads | ~70913 tok | +> Consolidated session (0 actions) ## Session: 2026-06-03 01:05 - -| Time | Action | File(s) | Outcome | ~Tokens | -|------|--------|---------|---------|--------| +> Consolidated session (0 actions) ## Session: 2026-06-03 01:16 - -| Time | Action | File(s) | Outcome | ~Tokens | -|------|--------|---------|---------|--------| -| 01:40 | Edited .kiro/specs/ha-config-bootstrap/research.md | modified is() | ~902 | -| 01:40 | Edited .kiro/specs/election-iomgr-refactor/research.md | modified body() | ~379 | -| 01:41 | Session end: 2 writes across 1 files (research.md) | 12 reads | ~76847 tok | -| 01:47 | Edited src/controller/ha.c | removed 72 lines | ~25 | -| 01:47 | Edited src/controller/ha.c | reduced (-16 lines) | ~52 | -| 01:47 | Edited src/controller/ha.h | 7→3 lines | ~26 | -| 01:48 | Edited src/controller/ha.h | reduced (-11 lines) | ~30 | -| 01:48 | Edited src/controller/cluster.c | 2→2 lines | ~28 | -| 01:48 | Edited src/controller/testsuite/test_ha_role.c | removed 87 lines | ~43 | -| 01:49 | Edited src/controller/testsuite/test_ha_role.c | reduced (-7 lines) | ~24 | -| 01:50 | Edited src/controller/testsuite/controller_test.c | 3→2 lines | ~18 | -| 01:51 | Edited src/controller/testsuite/controller_test.c | 3→2 lines | ~14 | -| 01:54 | Session end: 11 writes across 6 files (research.md, ha.c, ha.h, cluster.c, test_ha_role.c) | 15 reads | ~81340 tok | -| 02:06 | Edited src/controller/ha.c | removed 103 lines | ~28 | -| 02:07 | Edited src/controller/ha.h | reduced (-7 lines) | ~44 | -| 02:11 | Session end: 13 writes across 6 files (research.md, ha.c, ha.h, cluster.c, test_ha_role.c) | 16 reads | ~87405 tok | -| 02:13 | Session end: 13 writes across 6 files (research.md, ha.c, ha.h, cluster.c, test_ha_role.c) | 16 reads | ~86538 tok | -| 02:16 | Edited src/controller/ha.c | 3→2 lines | ~51 | -| 02:17 | Edited src/controller/ha.c | reduced (-22 lines) | ~52 | -| 02:18 | Edited src/controller/ha.c | removed 92 lines | ~95 | -| 02:19 | Edited src/controller/ha.h | 3→3 lines | ~74 | -| 02:19 | Edited src/controller/ha.h | 5→3 lines | ~76 | -| 02:21 | Edited src/controller/cluster.c | 3→3 lines | ~40 | -| 02:21 | Edited src/controller/cluster.c | ERROR() → ha_arm_heartbeat_timeout_vtask() | ~53 | -| 02:22 | Edited src/controller/testsuite/test_ha_role.c | removed 68 lines | ~57 | -| 02:24 | Edited src/controller/testsuite/test_ha_role.c | removed 30 lines | ~46 | -| 02:25 | Edited src/controller/testsuite/test_ha_role.c | 8→5 lines | ~53 | -| 02:30 | Session end: 23 writes across 6 files (research.md, ha.c, ha.h, cluster.c, test_ha_role.c) | 19 reads | ~92847 tok | -| 07:53 | Edited .kiro/specs/ha-config-bootstrap/manual-tests.md | modified Election() | ~150 | -| 07:53 | Edited .kiro/specs/ha-config-bootstrap/manual-tests.md | modified c() | ~217 | -| 07:54 | Edited .kiro/specs/ha-config-bootstrap/manual-tests.md | 14→15 lines | ~173 | -| 07:54 | Edited .kiro/specs/ha-config-bootstrap/manual-tests.md | 4→5 lines | ~37 | -| 07:56 | Edited .kiro/specs/ha-config-bootstrap/manual-tests.md | modified timeout() | ~1204 | -| 07:58 | Edited .kiro/specs/ha-config-bootstrap/tasks.md | modified test() | ~448 | -| 07:59 | Session end: 29 writes across 8 files (research.md, ha.c, ha.h, cluster.c, test_ha_role.c) | 22 reads | ~99923 tok | -| 08:05 | Edited .kiro/specs/ha-config-bootstrap/manual-tests.md | modified configs() | ~571 | -| 08:07 | Edited .kiro/specs/ha-config-bootstrap/manual-tests.md | modified Election() | ~399 | -| 08:08 | Edited .kiro/specs/ha-config-bootstrap/manual-tests.md | modified 3() | ~112 | -| 08:08 | Edited .kiro/specs/ha-config-bootstrap/manual-tests.md | 24→21 lines | ~279 | -| 08:09 | Edited .kiro/specs/ha-config-bootstrap/manual-tests.md | 9→9 lines | ~107 | -| 08:09 | Edited .kiro/specs/ha-config-bootstrap/manual-tests.md | 6→6 lines | ~108 | -| 08:10 | Session end: 35 writes across 8 files (research.md, ha.c, ha.h, cluster.c, test_ha_role.c) | 22 reads | ~101456 tok | -| 16:44 | Session end: 35 writes across 8 files (research.md, ha.c, ha.h, cluster.c, test_ha_role.c) | 22 reads | ~101456 tok | -| 16:50 | Edited src/controller/ha.c | added 1 condition(s) | ~798 | -| 17:06 | Edited src/lib/raft/raft.c | added 1 condition(s) | ~165 | -| 17:24 | Edited src/controller/myapp.c | added 3 condition(s) | ~358 | -| 17:36 | Session end: 38 writes across 10 files (research.md, ha.c, ha.h, cluster.c, test_ha_role.c) | 25 reads | ~104735 tok | -| 18:42 | Created .kiro/specs/ha-config-bootstrap/election-trace.md | — | ~3101 | -| 18:43 | Session end: 39 writes across 11 files (research.md, ha.c, ha.h, cluster.c, test_ha_role.c) | 25 reads | ~108232 tok | -| 19:03 | Session end: 39 writes across 11 files (research.md, ha.c, ha.h, cluster.c, test_ha_role.c) | 25 reads | ~108232 tok | -| 19:56 | Edited src/controller/myapp.c | modified if() | ~148 | -| 19:58 | Edited src/controller/ha.h | 2→3 lines | ~75 | -| 20:04 | Edited src/controller/ha.c | added 1 condition(s) | ~284 | -| 20:06 | Edited src/controller/ha.c | added 1 condition(s) | ~154 | -| 20:07 | Edited src/controller/ha.c | added 1 condition(s) | ~334 | -| 20:17 | Session end: 44 writes across 11 files (research.md, ha.c, ha.h, cluster.c, test_ha_role.c) | 26 reads | ~109543 tok | -| 21:06 | Session end: 44 writes across 11 files (research.md, ha.c, ha.h, cluster.c, test_ha_role.c) | 28 reads | ~127375 tok | -| 21:26 | Created ../../../../../claude/.claude/plans/hazy-exploring-swan.md | — | ~1126 | -| 21:31 | Created .kiro/specs/ha-repl-hardening/spec.json | — | ~129 | -| 21:31 | Created .kiro/specs/ha-repl-hardening/requirements.md | — | ~401 | -| 21:31 | Session end: 47 writes across 14 files (research.md, ha.c, ha.h, cluster.c, test_ha_role.c) | 30 reads | ~129425 tok | -| 23:47 | Created .kiro/specs/ha-repl-hardening/requirements.md | — | ~2557 | -| 23:48 | Edited .kiro/specs/ha-repl-hardening/requirements.md | inline fix | ~10 | -| 23:48 | Edited .kiro/specs/ha-repl-hardening/requirements.md | inline fix | ~36 | -| 23:49 | Edited .kiro/specs/ha-repl-hardening/requirements.md | inline fix | ~67 | -| 23:49 | Edited .kiro/specs/ha-repl-hardening/spec.json | 5→5 lines | ~36 | -| 23:50 | Session end: 52 writes across 14 files (research.md, ha.c, ha.h, cluster.c, test_ha_role.c) | 43 reads | ~165254 tok | -| 00:05 | Created .kiro/specs/ha-repl-hardening/requirements.md | — | ~3005 | -| 00:05 | Created ../../../../../claude/.claude/plans/hazy-exploring-swan.md | — | ~1174 | -| 00:19 | Session end: 54 writes across 14 files (research.md, ha.c, ha.h, cluster.c, test_ha_role.c) | 44 reads | ~172125 tok | -| 00:28 | Created .kiro/specs/ha-repl-hardening/research.md | — | ~2540 | -| 00:29 | Session end: 55 writes across 14 files (research.md, ha.c, ha.h, cluster.c, test_ha_role.c) | 47 reads | ~183452 tok | -| 00:41 | Session end: 55 writes across 14 files (research.md, ha.c, ha.h, cluster.c, test_ha_role.c) | 47 reads | ~183452 tok | -| 00:54 | Created .kiro/specs/ha-repl-hardening/design.md | — | ~4561 | -| 01:00 | Edited .kiro/specs/ha-repl-hardening/spec.json | 9→9 lines | ~54 | -| 01:05 | Session end: 57 writes across 15 files (research.md, ha.c, ha.h, cluster.c, test_ha_role.c) | 52 reads | ~210462 tok | -| 01:50 | Session end: 57 writes across 15 files (research.md, ha.c, ha.h, cluster.c, test_ha_role.c) | 52 reads | ~210462 tok | -| 01:54 | Created .kiro/specs/ha-repl-hardening/design.md | — | ~4278 | -| 01:54 | Session end: 58 writes across 15 files (research.md, ha.c, ha.h, cluster.c, test_ha_role.c) | 53 reads | ~219322 tok | -| 02:10 | Created .kiro/specs/ha-repl-hardening/raft-tla-audit.md | — | ~1698 | -| 02:11 | Session end: 59 writes across 16 files (research.md, ha.c, ha.h, cluster.c, test_ha_role.c) | 53 reads | ~221141 tok | -| 02:19 | Edited .kiro/specs/ha-repl-hardening/design.md | modified election() | ~464 | -| 02:20 | Session end: 60 writes across 16 files (research.md, ha.c, ha.h, cluster.c, test_ha_role.c) | 53 reads | ~221374 tok | -| 02:30 | Edited src/controller/CLAUDE.md | expanded (+64 lines) | ~1167 | -| 02:31 | Edited src/controller/CLAUDE.md | 5→7 lines | ~264 | -| 02:32 | Edited .kiro/specs/ha-repl-hardening/design.md | modified raft_cb_become_leader() | ~324 | -| 02:32 | Session end: 63 writes across 17 files (research.md, ha.c, ha.h, cluster.c, test_ha_role.c) | 54 reads | ~223254 tok | -| 02:46 | Edited .kiro/specs/ha-repl-hardening/design.md | expanded (+60 lines) | ~987 | -| 02:46 | Session end: 64 writes across 17 files (research.md, ha.c, ha.h, cluster.c, test_ha_role.c) | 54 reads | ~224616 tok | -| 02:58 | Session end: 64 writes across 17 files (research.md, ha.c, ha.h, cluster.c, test_ha_role.c) | 54 reads | ~224616 tok | -| 03:00 | Session end: 64 writes across 17 files (research.md, ha.c, ha.h, cluster.c, test_ha_role.c) | 54 reads | ~224616 tok | -| 03:17 | Created .kiro/specs/ha-repl-hardening/tasks.md | — | ~2932 | -| 03:18 | Created .kiro/specs/ha-repl-hardening/spec.json | — | ~128 | -| 03:18 | Session end: 66 writes across 17 files (research.md, ha.c, ha.h, cluster.c, test_ha_role.c) | 56 reads | ~230976 tok | +> Consolidated session (0 actions) ## Session: 2026-06-04 04:46 - -| Time | Action | File(s) | Outcome | ~Tokens | -|------|--------|---------|---------|--------| -| 04:54 | Edited .kiro/specs/ha-repl-hardening/design.md | "(checkpoint_lsn, last_rec" → "snap.part" | ~181 | -| 04:55 | Created ../../../../../claude/.claude/plans/functional-tumbling-squirrel.md | — | ~986 | -| 04:56 | Edited .kiro/specs/ha-repl-hardening/design.md | inline fix | ~92 | -| 04:57 | Edited .kiro/specs/ha-repl-hardening/design.md | 1→3 lines | ~150 | -| 04:57 | Edited .kiro/specs/ha-repl-hardening/design.md | 1→3 lines | ~147 | -| 04:58 | Edited .kiro/specs/ha-repl-hardening/design.md | inline fix | ~110 | -| 04:58 | Session end: 6 writes across 2 files (design.md, functional-tumbling-squirrel.md) | 6 reads | ~13860 tok | -| 05:14 | Created .kiro/specs/ha-repl-hardening/tasks.md | — | ~3735 | -| 05:15 | Created .kiro/specs/ha-repl-hardening/spec.json | — | ~128 | -| 05:15 | Session end: 8 writes across 4 files (design.md, functional-tumbling-squirrel.md, tasks.md, spec.json) | 9 reads | ~21714 tok | -| 05:21 | Created .kiro/specs/ha-repl-hardening/spec.json | — | ~128 | -| 05:58 | Session end: 9 writes across 4 files (design.md, functional-tumbling-squirrel.md, tasks.md, spec.json) | 17 reads | ~171206 tok | -| 06:04 | Session end: 9 writes across 4 files (design.md, functional-tumbling-squirrel.md, tasks.md, spec.json) | 17 reads | ~171206 tok | -| 06:05 | Session end: 9 writes across 4 files (design.md, functional-tumbling-squirrel.md, tasks.md, spec.json) | 17 reads | ~171206 tok | -| 06:10 | Edited src/schema/controller.capnp | 12→16 lines | ~162 | -| 06:13 | Edited src/schema/controller.capnp | modified mapname() | ~66 | -| 06:17 | Edited src/schema/controller.capnp | 4→4 lines | ~66 | -| 06:20 | Edited src/schema/controller.capnp | modified mapname() | ~66 | -| 06:21 | Edited src/include/typemap.h | modified struct() | ~255 | -| 06:21 | Edited src/schema/controller.capnp | 4→4 lines | ~68 | -| 06:24 | Edited src/schema/controller.capnp | 4→1 lines | ~27 | -| 06:24 | Edited src/schema/controller.capnp | modified mapname() | ~138 | -| 06:24 | Edited src/include/typemap.h | 3→3 lines | ~31 | -| 13:27 | Task 1.1 (ha-repl-hardening): Added StateReport struct + stateReportMsg @15 union variant to RequestReply in controller.capnp; added state_report_t typedef + pointer member to xce_reply_t in typemap.h; workaround for capnpc-c 1.0.1 group-in-union codec bug | src/schema/controller.capnp, src/include/typemap.h | GREEN: controller build + tests pass (1/1 OK) | ~3000 | -| 06:33 | Edited .kiro/specs/ha-repl-hardening/tasks.md | inline fix | ~22 | -| 06:36 | Edited src/schema/controller.capnp | modified mapname() | ~77 | -| 06:38 | Edited src/include/typemap.h | modified struct() | ~91 | -| 13:41 | Task 1.2: added entries @3 :List(WalCatchupEntry) to WalCatchupEntry in controller.capnp; added n_entries/entries fields to wal_catchup_entry_t in typemap.h | src/schema/controller.capnp, src/include/typemap.h | GREEN: 1/1 controller test OK, 0 failures | ~800 | -| 06:45 | Edited .kiro/specs/ha-repl-hardening/tasks.md | inline fix | ~10 | -| 06:48 | Edited src/schema/controller.capnp | modified mapname() | ~252 | -| 06:48 | Edited src/include/typemap.h | modified struct() | ~122 | -| 06:55 | Edited .kiro/specs/ha-repl-hardening/tasks.md | inline fix | ~14 | -| 06:58 | Edited src/controller/testsuite/test_ha_role.c | modified test_ha_init_zeroes_standby_convergence_fields() | ~602 | -| 06:59 | Edited src/controller/ha.h | 3→7 lines | ~161 | -| 06:59 | Edited src/controller/ha.c | 3→8 lines | ~132 | -| 07:14 | Edited .kiro/specs/ha-repl-hardening/tasks.md | inline fix | ~19 | -| 07:33 | Edited src/controller/testsuite/test_config_repl.c | added error handling | ~298 | -| 07:33 | Edited src/controller/testsuite/test_config_repl.c | added error handling | ~1332 | -| 07:33 | Edited src/controller/testsuite/test_config_repl.c | added error handling | ~123 | -| 07:38 | Edited src/controller/testsuite/test_config_repl.c | modified test_wal_catchup_entry_advances_applied_lsn() | ~950 | -| 07:41 | Edited src/controller/cluster.c | added error handling | ~895 | -| 07:41 | Edited src/controller/cluster.c | added error handling | ~161 | -| 07:42 | Edited src/controller/cluster.c | 7→8 lines | ~38 | -| 07:44 | Edited src/controller/cluster.c | modified handle_wal_catchup_entry() | ~179 | -| 07:45 | Edited src/controller/ha.c | added error handling | ~691 | -| 07:46 | Edited src/controller/ha.h | added error handling | ~190 | -| 07:47 | Edited src/controller/ha.h | added error handling | ~81 | -| 08:05 | Edited .kiro/specs/ha-repl-hardening/tasks.md | inline fix | ~20 | -| 08:09 | Edited src/controller/testsuite/test_config_repl.c | added error handling | ~1800 | -| 08:10 | Edited src/controller/testsuite/test_config_repl.c | 5→10 lines | ~135 | -| 08:22 | Edited src/controller/ha.c | added 4 condition(s) | ~1220 | -| 08:32 | Edited .kiro/specs/ha-repl-hardening/tasks.md | inline fix | ~15 | -| 08:47 | Edited src/controller/testsuite/test_config_repl.c | modified XCE_TESTING() | ~871 | -| 08:48 | Edited src/controller/testsuite/test_config_repl.c | 6→9 lines | ~120 | -| 08:49 | Edited src/controller/cluster.c | modified XCE_TESTING() | ~558 | -| 08:50 | Edited src/controller/cluster.c | modified XCE_TESTING() | ~408 | -| 08:50 | Edited src/controller/cluster.c | modified XCE_TESTING() | ~323 | -| 08:51 | Edited src/controller/cluster.c | 10→15 lines | ~192 | -| 08:51 | Edited src/controller/testsuite/test_config_repl.c | TEST_ASSERT_NOT_NULL() → TEST_ASSERT_EQUAL_PTR() | ~826 | -| 08:54 | Edited src/controller/ha.h | modified struct() | ~184 | -| 08:55 | Edited src/controller/ha.h | 6→7 lines | ~105 | -| 08:55 | Edited src/controller/ha.h | 9→7 lines | ~124 | -| 08:56 | Edited src/controller/ha.c | modified ha_nop_reply_state_report() | ~316 | -| 08:57 | Edited src/controller/cluster.c | removed 24 lines | ~1 | -| 09:02 | Edited .kiro/specs/ha-repl-hardening/tasks.md | inline fix | ~18 | -| 09:14 | Edited src/controller/testsuite/test_ha_role.c | modified under() | ~1609 | -| 09:15 | Edited src/controller/ha.h | modified criteria() | ~411 | -| 09:15 | Edited src/controller/ha.c | added 2 condition(s) | ~486 | -| 09:19 | Edited src/controller/ha.c | added 3 condition(s) | ~932 | -| 09:21 | Edited src/controller/ha.c | decode_StateReport_ptr() → read_StateReport() | ~170 | -| 09:36 | Edited .kiro/specs/ha-repl-hardening/tasks.md | 2→2 lines | ~36 | -| 09:41 | Session end: 64 writes across 11 files (design.md, functional-tumbling-squirrel.md, tasks.md, spec.json, controller.capnp) | 45 reads | ~315308 tok | -| 09:44 | Edited src/controller/testsuite/test_ha_role.c | modified under() | ~1227 | -| 09:44 | Edited src/controller/ha.h | modified enum() | ~592 | -| 09:45 | Edited src/controller/ha.c | added 3 condition(s) | ~387 | -| 16:53 | Task 3.2: add ha_evaluate_repl_action() enum+pure fn to ha.h/ha.c; 5 new unit tests in test_ha_role.c | ha.h, ha.c, test_ha_role.c | build+tests pass (exit 0) | ~800 | -| 09:57 | Edited src/controller/testsuite/test_ha_role.c | 4→4 lines | ~48 | -| 09:57 | Edited src/controller/testsuite/test_ha_role.c | "test_evaluate_repl_action" → "test_evaluate_repl_action" | ~18 | -| 09:58 | Edited src/controller/testsuite/test_ha_role.c | inline fix | ~16 | -| 09:58 | Edited .kiro/specs/ha-repl-hardening/tasks.md | inline fix | ~19 | -| 10:05 | Edited src/controller/testsuite/test_ha_role.c | modified XCE_TESTING() | ~1141 | -| 10:05 | Edited src/controller/testsuite/test_ha_role.c | 7→10 lines | ~147 | -| 10:06 | Edited src/controller/ha.h | expanded (+15 lines) | ~251 | -| 10:06 | Edited src/controller/ha.h | expanded (+30 lines) | ~486 | -| 10:07 | Edited src/controller/ha.c | modified calls() | ~194 | -| 10:08 | Edited src/controller/ha.c | added 4 condition(s) | ~935 | -| 10:08 | Edited src/controller/ha.c | added 1 condition(s) | ~218 | -| 10:09 | Edited src/controller/ha.c | modified XCE_TESTING() | ~204 | -| 10:11 | Edited src/controller/testsuite/test_ha_role.c | removed 8 lines | ~11 | -| 10:18 | Edited .kiro/specs/ha-repl-hardening/tasks.md | inline fix | ~16 | -| 10:32 | Edited src/controller/ha.h | expanded (+6 lines) | ~530 | -| 10:32 | Edited src/controller/ha.h | expanded (+20 lines) | ~278 | -| 10:33 | Edited src/controller/config_repl.h | expanded (+28 lines) | ~374 | -| 10:34 | Edited src/controller/testsuite/test_config_repl.c | added error handling | ~1834 | -| 10:34 | Edited src/controller/testsuite/test_config_repl.c | 5→9 lines | ~116 | -| 10:35 | Edited src/controller/testsuite/test_ha_role.c | modified XCE_TESTING() | ~418 | -| 10:36 | Edited src/controller/ha.c | added 2 condition(s) | ~1016 | -| 10:37 | Edited src/controller/ha.c | expanded (+10 lines) | ~149 | -| 10:37 | Edited src/controller/ha.c | 3→3 lines | ~57 | -| 10:40 | Edited src/controller/config_repl.c | added error handling | ~1875 | -| 10:40 | Edited src/controller/ha.c | modified if() | ~122 | -| 11:30 | Task 3.4 (ha-repl-hardening): ha_stream_wal_to_standby() in config_repl.c; batch accumulation up to 256 entries/64KB; xce_wal_stream_request_hook seam; ha_repl_stream_wal_hook in ha.h; ep param added to ha_dispatch_repl_action_for_standby; 3 new tests in test_config_repl.c RED→GREEN | config_repl.c, config_repl.h, ha.c, ha.h, testsuite/test_config_repl.c, testsuite/test_ha_role.c | GREEN: 3/3 new tests PASS, 1/1 controller test OK | ~3000 | -| 10:47 | Edited .kiro/specs/ha-repl-hardening/tasks.md | inline fix | ~16 | -| 10:56 | Edited src/controller/ha.c | 3→3 lines | ~55 | -| 10:57 | Edited src/controller/ha.c | inline fix | ~16 | -| 10:57 | Edited src/controller/ha.c | inline fix | ~18 | -| 10:58 | Session end: 96 writes across 13 files (design.md, functional-tumbling-squirrel.md, tasks.md, spec.json, controller.capnp) | 50 reads | ~345091 tok | -| 16:09 | Edited src/controller/testsuite/test_config_repl.c | added 1 condition(s) | ~1007 | -| 16:09 | Edited src/controller/testsuite/test_config_repl.c | 5→8 lines | ~102 | -| 16:10 | Edited src/controller/config_repl.c | added 6 condition(s) | ~635 | -| 16:11 | Edited src/controller/config_repl.h | 4→9 lines | ~89 | -| 16:11 | Edited src/controller/ha.c | added 1 condition(s) | ~220 | -| 16:21 | Edited src/controller/config_repl.c | added error handling | ~456 | -| 16:22 | Edited src/controller/testsuite/test_config_repl.c | 9→12 lines | ~192 | -| 16:22 | Edited src/controller/testsuite/test_config_repl.c | 5→5 lines | ~86 | -| 16:44 | Session end: 104 writes across 13 files (design.md, functional-tumbling-squirrel.md, tasks.md, spec.json, controller.capnp) | 51 reads | ~352103 tok | -| 18:16 | Edited .kiro/specs/ha-repl-hardening/tasks.md | expanded (+26 lines) | ~562 | -| 18:18 | Edited src/controller/ha.c | modified XCE_TESTING() | ~131 | -| 18:18 | Edited src/controller/ha.c | modified if() | ~148 | -| 18:18 | Edited src/controller/config_repl.h | 2→4 lines | ~50 | -| 18:19 | Edited src/controller/config_repl.c | added 1 condition(s) | ~151 | -| 18:19 | Edited src/controller/config_repl.c | added 3 condition(s) | ~140 | -| 18:19 | Edited src/controller/testsuite/test_config_repl.c | 2→2 lines | ~38 | -| 18:19 | Edited src/controller/testsuite/test_config_repl.c | inline fix | ~16 | -| 18:21 | Edited src/controller/testsuite/test_config_repl.c | 2→2 lines | ~38 | -| 18:24 | Edited .kiro/specs/ha-repl-hardening/tasks.md | inline fix | ~18 | -| 18:29 | Edited src/include/persist.h | 5→10 lines | ~173 | -| 18:29 | Edited src/controller/persist.c | modified persist_load_snapshot() | ~90 | -| 18:30 | Edited src/controller/ha.h | expanded (+24 lines) | ~323 | -| 18:31 | Edited src/controller/testsuite/test_config_repl.c | added 1 condition(s) | ~1829 | -| 18:31 | Edited src/controller/testsuite/test_config_repl.c | 4→8 lines | ~107 | -| 18:33 | Edited src/controller/ha.c | added 9 condition(s) | ~984 | -| 18:34 | Edited src/controller/cluster.c | added 2 condition(s) | ~367 | -| 18:34 | Edited src/controller/cluster.c | expanded (+7 lines) | ~212 | -| 01:37 | Task 3.5c (ha-repl-hardening): ha_handle_snapshot_chunk() in ha.c; persist_load_snapshot() wrapper in persist.c; declared in ha.h and persist.h; case OPCode_snapshotTransfer wired in cluster.c; 3 new tests in test_config_repl.c; RED→GREEN TDD | ha.c, ha.h, persist.c, persist.h, cluster.c, testsuite/test_config_repl.c | GREEN: 3/3 new tests PASS, 1/1 controller test OK | ~2500 | -| 18:38 | Edited .kiro/specs/ha-repl-hardening/tasks.md | inline fix | ~20 | -| 18:46 | Edited src/controller/ha.h | 2→3 lines | ~55 | -| 18:46 | Edited src/controller/ha.h | expanded (+14 lines) | ~220 | -| 18:46 | Edited src/controller/ha.c | added 1 condition(s) | ~190 | -| 18:47 | Edited src/controller/ha.c | expanded (+8 lines) | ~147 | -| 18:47 | Edited src/controller/testsuite/test_ha_role.c | modified XCE_TESTING() | ~651 | -| 18:47 | Edited src/controller/testsuite/test_ha_role.c | 3→5 lines | ~91 | -| 18:48 | Edited src/controller/testsuite/test_config_repl.c | modified creates() | ~1262 | -| 18:48 | Edited src/controller/testsuite/test_config_repl.c | 5→7 lines | ~92 | +> Consolidated session (144 actions) ## Session: 2026-06-05 18:53 @@ -847,3 +555,308 @@ | 04:07 | Closed 6 specs: ha-repl-hardening→implemented, ha-peer-connection-reuse (ASAN leak fix), ha-heartbeat-liveness (last_activity on WAL/snap/config handlers), raft-library (handle_request_vote→XCE_TESTING), ha-config-bootstrap→implemented (all tasks done, policy gaps documented). 9/9 specs: 8 implemented, 1 remaining (scheduler-controller-msg-gap, bugs 335/336) | ha.c ha.h cluster.c config_repl.c test_ha_connection_reuse.c spec.json x6 | controller suite green | ~60k | | 21:07 | Session end: 8 writes across 5 files (test_ha_connection_reuse.c, cluster.c, config_repl.c, ha.c, ha.h) | 8 reads | ~67113 tok | | 21:11 | Session end: 8 writes across 5 files (test_ha_connection_reuse.c, cluster.c, config_repl.c, ha.c, ha.h) | 8 reads | ~67113 tok | +| 21:16 | Edited src/scheduler/src/scheduler.c | added 2 condition(s) | ~322 | +| 21:16 | Edited src/scheduler/src/scheduler.c | added 1 condition(s) | ~232 | +| 21:17 | Edited src/scheduler/src/scheduler.c | 4→6 lines | ~94 | +| 21:17 | Edited src/scheduler/src/scheduler.c | 6→6 lines | ~99 | +| 21:19 | Session end: 12 writes across 6 files (test_ha_connection_reuse.c, cluster.c, config_repl.c, ha.c, ha.h) | 11 reads | ~67912 tok | +| 21:22 | Session end: 12 writes across 6 files (test_ha_connection_reuse.c, cluster.c, config_repl.c, ha.c, ha.h) | 11 reads | ~67912 tok | +| 21:47 | Edited src/controller/ha.c | expanded (+12 lines) | ~220 | +| 21:50 | Session end: 13 writes across 6 files (test_ha_connection_reuse.c, cluster.c, config_repl.c, ha.c, ha.h) | 12 reads | ~80555 tok | +| 21:52 | Edited src/controller/CLAUDE.md | modified state() | ~593 | +| 21:58 | Edited src/controller/ha.c | expanded (+6 lines) | ~194 | +| 23:26 | Edited src/controller/CLAUDE.md | "CTRL_ELECTING" → "CTRL_INIT" | ~92 | +| 23:26 | Session end: 16 writes across 7 files (test_ha_connection_reuse.c, cluster.c, config_repl.c, ha.c, ha.h) | 13 reads | ~83812 tok | +| 23:31 | Edited src/controller/ha.c | added 1 condition(s) | ~261 | +| 23:32 | Edited src/controller/cluster.c | added 1 condition(s) | ~139 | +| 23:32 | Edited src/controller/config_repl.c | added 1 condition(s) | ~137 | +| 23:32 | Edited src/controller/ha.h | 2→7 lines | ~108 | +| 23:32 | Edited src/controller/ha.c | 4→4 lines | ~74 | +| 23:35 | Edited src/controller/cluster.c | added 1 condition(s) | ~185 | +| 23:42 | Session end: 22 writes across 7 files (test_ha_connection_reuse.c, cluster.c, config_repl.c, ha.c, ha.h) | 13 reads | ~84971 tok | +| 00:09 | Session end: 22 writes across 7 files (test_ha_connection_reuse.c, cluster.c, config_repl.c, ha.c, ha.h) | 13 reads | ~44079 tok | +| 00:34 | Session end: 22 writes across 7 files (test_ha_connection_reuse.c, cluster.c, config_repl.c, ha.c, ha.h) | 14 reads | ~44079 tok | +| 00:40 | Created .kiro/specs/ha-wal-replication/brief.md | — | ~885 | +| 00:40 | Session end: 23 writes across 8 files (test_ha_connection_reuse.c, cluster.c, config_repl.c, ha.c, ha.h) | 14 reads | ~45027 tok | +| 00:42 | Created .kiro/specs/ha-wal-replication/spec.json | — | ~129 | +| 00:42 | Created .kiro/specs/ha-wal-replication/requirements.md | — | ~169 | +| 00:43 | Created .kiro/specs/ha-wal-replication/requirements.md | — | ~1160 | +| 00:45 | Created .kiro/specs/ha-wal-replication/design.md | — | ~1507 | +| 00:46 | Created .kiro/specs/ha-wal-replication/tasks.md | — | ~1754 | +| 00:47 | Session end: 28 writes across 12 files (test_ha_connection_reuse.c, cluster.c, config_repl.c, ha.c, ha.h) | 18 reads | ~51902 tok | +| 00:56 | Edited src/controller/testsuite/test_repl_unit.c | added error handling | ~203 | +| 00:57 | Edited src/controller/testsuite/test_repl_unit.c | added error handling | ~1901 | +| 00:57 | Edited src/controller/testsuite/test_repl_unit.c | inline fix | ~4 | +| 00:58 | Edited src/controller/repl.c | added error handling | ~149 | +| 00:58 | Edited src/controller/repl.c | added 2 condition(s) | ~600 | +| 00:59 | Edited src/controller/repl.c | DEBUG3() → TRACE() | ~35 | +| 01:18 | Edited src/controller/testsuite/test_repl_unit.c | modified Test() | ~292 | +| 01:18 | Edited src/controller/testsuite/test_repl_unit.c | 2→4 lines | ~51 | +| 01:25 | Edited src/controller/repl.c | added 1 condition(s) | ~170 | +| 01:26 | Edited src/controller/ha.c | added 2 condition(s) | ~367 | +| 01:26 | Edited src/controller/ha.c | added 2 condition(s) | ~276 | +| 01:27 | Edited src/controller/ha.c | added 1 condition(s) | ~238 | +| 01:27 | Edited src/controller/ha.c | added 1 condition(s) | ~202 | +| 01:41 | Edited src/schema/controller.capnp | 2→3 lines | ~55 | +| 01:41 | Edited src/include/typemap.h | 4→5 lines | ~59 | +| 01:42 | Edited src/controller/ha.h | modified success() | ~230 | +| 01:43 | Edited src/controller/ha.c | added 1 condition(s) | ~923 | +| 01:45 | Edited src/controller/cluster.c | modified handle_wal_catchup_entry() | ~344 | +| 01:45 | Edited src/controller/cluster.c | inline fix | ~15 | +| 01:45 | Edited src/controller/testsuite/test_config_repl.c | modified XCE_TESTING() | ~108 | +| 01:46 | Edited src/controller/testsuite/test_config_repl.c | inline fix | ~15 | +| 01:46 | Edited src/controller/testsuite/test_config_repl.c | inline fix | ~23 | +| 01:47 | Edited src/controller/testsuite/test_ha_role.c | added error handling | ~507 | +| 01:48 | Edited src/controller/testsuite/test_ha_role.c | modified 3() | ~115 | +| 01:50 | Edited src/include/typemap.h | added error handling | ~136 | +| 09:13 | Implemented Tasks 3.1/3.2/3.3 (ha-wal-replication): WalAckReply after WAL apply, skip ACK on failure, dispatch gate test | schema/controller.capnp, include/typemap.h, controller/ha.c, controller/ha.h, controller/cluster.c, testsuite/test_config_repl.c, testsuite/test_ha_role.c | Build clean, controller test suite: 1/1 OK (test_dispatch_gate_allows_wal_catchup_in_standby_roles PASS) | ~3500 | + +## Session: 2026-06-10 02:17 + +| Time | Action | File(s) | Outcome | ~Tokens | +|------|--------|---------|---------|--------| +| 02:17 | Edited src/controller/ha.c | added 3 condition(s) | ~290 | + +## Session: 2026-06-10 02:19 + +| Time | Action | File(s) | Outcome | ~Tokens | +|------|--------|---------|---------|--------| + +## Session: 2026-06-10 02:21 + +| Time | Action | File(s) | Outcome | ~Tokens | +|------|--------|---------|---------|--------| +| 02:31 | Edited src/controller/testsuite/test_repl_unit.c | added 2 condition(s) | ~1033 | +| 02:32 | Edited src/controller/testsuite/test_repl_unit.c | 13→15 lines | ~103 | +| 02:32 | Edited src/controller/testsuite/test_repl_unit.c | 4→3 lines | ~55 | +| 02:32 | Edited src/controller/testsuite/test_repl_unit.c | 3→6 lines | ~65 | +| 09:36 | task 4.1: added test_wal_ack_reply_updates_acked_lsn_and_signals + test_wal_nack_does_not_update_acked_lsn to test_repl_unit.c; build+tests pass (1/1 OK) | test_repl_unit.c | PASS | ~2k | +| 02:46 | Edited .kiro/specs/ha-wal-replication/tasks.md | inline fix | ~13 | +| 02:49 | Edited src/controller/testsuite/test_p2_integration.c | 23→24 lines | ~164 | +| 02:50 | Edited src/controller/testsuite/test_p2_integration.c | added 1 condition(s) | ~1255 | +| 02:59 | Edited src/controller/testsuite/test_p2_integration.c | added error handling | ~259 | +| 02:59 | Edited src/controller/testsuite/test_p2_integration.c | 25→28 lines | ~312 | +| 02:59 | Edited src/controller/testsuite/test_p2_integration.c | modified test_committed_lsn_advances_after_majority_ack() | ~294 | +| 03:01 | Edited src/controller/testsuite/test_p2_integration.c | 4→5 lines | ~28 | +| 10:02 | Fixed ASAN global-buffer-overflow in test_p2_integration.c (tests 8+9) | src/controller/testsuite/test_p2_integration.c | build green, 1/1 tests pass | ~800 | +| 10:07 | Task 4.2 (ha-wal-replication): gap analysis → added Test 8 (committed_lsn not advanced on timeout, Req 4.2) and Test 9 (committed_lsn advances after majority ACK, Req 4.1/4.4) to test_p2_integration.c; repl_broadcast_send_hook seam used to drop sends to dummy eps; build-fix: added pthread.h + typemap.h + extern hook declaration | test_p2_integration.c | GREEN (1/1 controller test OK) | ~180 | +| 03:36 | Edited src/controller/testsuite/test_p2_integration.c | modified test_committed_lsn_advances_after_majority_ack() | ~856 | +| 03:37 | Edited src/controller/testsuite/test_p2_integration.c | modified test_single_node_committed_lsn_unchanged() | ~525 | +| 03:37 | Edited src/controller/testsuite/test_p2_integration.c | 2→3 lines | ~43 | +| 03:37 | Edited src/controller/testsuite/test_repl_unit.c | modified 3() | ~541 | + +## Session: 2026-06-10 04:04 + +| Time | Action | File(s) | Outcome | ~Tokens | +|------|--------|---------|---------|--------| + +## Session: 2026-06-10 04:06 + +| Time | Action | File(s) | Outcome | ~Tokens | +|------|--------|---------|---------|--------| + +## Session: 2026-06-10 04:08 + +| Time | Action | File(s) | Outcome | ~Tokens | +|------|--------|---------|---------|--------| +| 04:18 | Edited .kiro/specs/ha-wal-replication/tasks.md | inline fix | ~14 | +| 04:22 | Edited src/controller/testsuite/test_repl_unit.c | modified 1() | ~830 | +| 04:42 | Edited .kiro/specs/ha-wal-replication/tasks.md | 20→20 lines | ~269 | +| 04:54 | Edited .kiro/specs/ha-wal-replication/tasks.md | 14→16 lines | ~264 | +| 12:04 | ha-wal-replication impl complete: tasks 4.1,4.2,5.1-5.3,5.5 done; 5.4 blocked (manual); validation GO | ha.c,repl.c,test_repl_unit.c,test_p2_integration.c | 308 assertions pass; 7 commits | ~800k | +| 05:04 | Session end: 4 writes across 2 files (tasks.md, test_repl_unit.c) | 17 reads | ~15633 tok | +| 05:46 | Session end: 4 writes across 2 files (tasks.md, test_repl_unit.c) | 17 reads | ~15633 tok | +| 06:32 | Session end: 4 writes across 2 files (tasks.md, test_repl_unit.c) | 34 reads | ~15633 tok | +| 06:41 | Created src/docs/xce.md | — | ~428 | +| 06:41 | Created src/docs/p1-2-host-select.md | — | ~583 | +| 06:41 | Session end: 6 writes across 4 files (tasks.md, test_repl_unit.c, xce.md, p1-2-host-select.md) | 34 reads | ~16715 tok | +| 07:12 | Edited .kiro/steering/product.md | inline fix | ~119 | +| 07:12 | Edited .kiro/steering/product.md | expanded (+9 lines) | ~263 | +| 07:12 | Edited .kiro/steering/tech.md | inline fix | ~98 | +| 07:13 | Edited .kiro/steering/tech.md | 2→2 lines | ~73 | +| 07:13 | Edited .kiro/steering/tech.md | inline fix | ~63 | +| 07:13 | Session end: 11 writes across 6 files (tasks.md, test_repl_unit.c, xce.md, p1-2-host-select.md, product.md) | 40 reads | ~22718 tok | +| 07:21 | Created .kiro/steering/ha-async-io.md | — | ~1440 | +| 07:21 | Created .kiro/steering/api-standards.md | — | ~1377 | +| 07:21 | Created .kiro/steering/build-deployment.md | — | ~1324 | +| 07:21 | Session end: 14 writes across 9 files (tasks.md, test_repl_unit.c, xce.md, p1-2-host-select.md, product.md) | 65 reads | ~30737 tok | +| 07:38 | Edited CLAUDE.md | 5→5 lines | ~98 | +| 07:38 | Session end: 15 writes across 10 files (tasks.md, test_repl_unit.c, xce.md, p1-2-host-select.md, product.md) | 65 reads | ~30842 tok | +| 07:43 | Edited CLAUDE.md | reduced (-47 lines) | ~476 | +| 07:44 | Session end: 16 writes across 10 files (tasks.md, test_repl_unit.c, xce.md, p1-2-host-select.md, product.md) | 65 reads | ~31381 tok | +| 07:53 | Edited src/controller/CLAUDE.md | 6→5 lines | ~43 | +| 07:54 | Edited src/controller/CLAUDE.md | 3→5 lines | ~119 | +| 07:54 | Edited src/controller/CLAUDE.md | removed 107 lines | ~94 | +| 07:55 | Edited src/frontend/CLAUDE.md | reduced (-23 lines) | ~202 | +| 07:55 | Session end: 20 writes across 10 files (tasks.md, test_repl_unit.c, xce.md, p1-2-host-select.md, product.md) | 70 reads | ~37470 tok | +| 19:45 | Edited src/lib/netio.c | 13→14 lines | ~79 | +| 19:45 | Edited src/lib/netio.c | modified iomgr_init() | ~96 | +| 19:46 | Edited src/lib/delay.c | 3→2 lines | ~10 | +| 19:49 | Session end: 23 writes across 12 files (tasks.md, test_repl_unit.c, xce.md, p1-2-host-select.md, product.md) | 73 reads | ~37667 tok | +| 20:17 | Edited src/controller/repl.c | added 1 condition(s) | ~124 | +| 20:17 | Edited src/controller/ha.c | TRACE() → INFO() | ~85 | +| 20:18 | Edited src/controller/ha.c | TRACE() → INFO() | ~52 | +| 20:19 | Session end: 26 writes across 14 files (tasks.md, test_repl_unit.c, xce.md, p1-2-host-select.md, product.md) | 74 reads | ~75968 tok | +| 20:23 | Edited src/controller/job.c | modified if() | ~396 | +| 20:24 | Session end: 27 writes across 15 files (tasks.md, test_repl_unit.c, xce.md, p1-2-host-select.md, product.md) | 74 reads | ~76392 tok | +| 20:30 | Edited src/controller/ha.c | added 1 condition(s) | ~813 | +| 20:31 | Session end: 28 writes across 15 files (tasks.md, test_repl_unit.c, xce.md, p1-2-host-select.md, product.md) | 74 reads | ~77274 tok | +| 20:37 | Session end: 28 writes across 15 files (tasks.md, test_repl_unit.c, xce.md, p1-2-host-select.md, product.md) | 75 reads | ~77482 tok | +| 20:41 | Edited src/controller/ha.c | added 3 condition(s) | ~659 | +| 20:42 | Edited src/controller/ha.c | 2→2 lines | ~26 | +| 20:43 | Session end: 30 writes across 15 files (tasks.md, test_repl_unit.c, xce.md, p1-2-host-select.md, product.md) | 76 reads | ~78216 tok | +| 20:46 | Edited src/controller/persist.c | mode() → registered() | ~139 | +| 20:47 | Edited src/controller/job.c | added 1 condition(s) | ~255 | +| 20:47 | Session end: 32 writes across 16 files (tasks.md, test_repl_unit.c, xce.md, p1-2-host-select.md, product.md) | 77 reads | ~86410 tok | + +## Session: 2026-06-11 20:58 + +| Time | Action | File(s) | Outcome | ~Tokens | +|------|--------|---------|---------|--------| +| 21:10 | Created .kiro/specs/ha-consistency-invariants/brief.md | — | ~2197 | +| 21:15 | kiro-discovery: HA consistency invariant audit → new spec brief (Path C) | .kiro/specs/ha-consistency-invariants/brief.md | 8 violations found (PRIMARY_COMMITTING removal, universal majority-ack barrier, quorum accounting) | ~130k | +| 21:11 | Created ../../../../../claude/.claude/projects/-home-rshen-projects-xce-xce/memory/project_ha_consistency_invariants.md | — | ~266 | +| 21:11 | Session end: 2 writes across 2 files (brief.md, project_ha_consistency_invariants.md) | 7 reads | ~72373 tok | +| 21:17 | Created .kiro/specs/ha-consistency-invariants/brief.md | — | ~3110 | +| 21:17 | Edited .kiro/steering/product.md | inline fix | ~124 | +| 21:17 | Edited .kiro/steering/product.md | inline fix | ~179 | +| 21:18 | Created ../../../../../claude/.claude/projects/-home-rshen-projects-xce-xce/memory/project_ha_consistency_invariants.md | — | ~370 | +| 21:30 | Reframed ha-consistency-invariants under Raft+CP governing model; superseded 'No Raft' steering decision | brief.md, product.md, cerebrum.md | brief now maps each rule to Raft paper section | ~15k | +| 21:19 | Session end: 6 writes across 3 files (brief.md, project_ha_consistency_invariants.md, product.md) | 7 reads | ~76425 tok | +| 21:20 | Created .kiro/specs/ha-consistency-invariants/spec.json | — | ~134 | +| 21:20 | Created .kiro/specs/ha-consistency-invariants/requirements.md | — | ~484 | +| 21:40 | kiro-spec-init ha-consistency-invariants: spec.json + requirements.md created from brief | .kiro/specs/ha-consistency-invariants/ | phase=initialized | ~3k | +| 21:21 | Session end: 8 writes across 5 files (brief.md, project_ha_consistency_invariants.md, product.md, spec.json, requirements.md) | 9 reads | ~77242 tok | +| 21:26 | Created .kiro/specs/ha-consistency-invariants/requirements.md | — | ~3174 | +| 21:27 | Edited .kiro/specs/ha-consistency-invariants/requirements.md | inline fix | ~47 | +| 21:27 | Edited .kiro/specs/ha-consistency-invariants/spec.json | 8→8 lines | ~56 | +| 21:55 | kiro-spec-requirements ha-consistency-invariants: 7 EARS requirements generated from Raft+CP deductions | .kiro/specs/ha-consistency-invariants/requirements.md, spec.json | review gate passed (1 repair: R1.4 subject) | ~25k | +| 21:27 | Session end: 11 writes across 5 files (brief.md, project_ha_consistency_invariants.md, product.md, spec.json, requirements.md) | 13 reads | ~84086 tok | +| 21:47 | Created .kiro/specs/ha-consistency-invariants/research.md | — | ~3325 | +| 22:15 | kiro-validate-gap ha-consistency-invariants: research.md written; key finds: apply-before-commit universal (even job submit), acked_lsn>0 not per-entry, notification-shaped facts can't be rejected | .kiro/specs/ha-consistency-invariants/research.md | Option C (phased) recommended; 6 research items for design | ~120k | +| 21:48 | Session end: 12 writes across 6 files (brief.md, project_ha_consistency_invariants.md, product.md, spec.json, requirements.md) | 16 reads | ~90652 tok | +| 22:09 | Edited .kiro/specs/ha-consistency-invariants/research.md | 3→3 lines | ~323 | +| 22:09 | Edited .kiro/specs/ha-consistency-invariants/research.md | 2→3 lines | ~199 | +| 22:10 | Edited .kiro/specs/ha-consistency-invariants/research.md | modified Needed() | ~507 | +| 22:11 | Edited .kiro/specs/ha-consistency-invariants/research.md | expanded (+50 lines) | ~2290 | +| 22:45 | Deep-dive research Req 2.2/2.4/2.5 (3 parallel agents): notify has zero redelivery (bug-396), hook inversion feasible, 5 convergence gaps | research.md, buglog.json | all Unknown tags resolved | ~390k | +| 22:12 | Session end: 16 writes across 6 files (brief.md, project_ha_consistency_invariants.md, product.md, spec.json, requirements.md) | 30 reads | ~94209 tok | +| 23:34 | Edited .kiro/specs/ha-consistency-invariants/requirements.md | inline fix | ~172 | +| 23:34 | Edited .kiro/specs/ha-consistency-invariants/requirements.md | 3→4 lines | ~271 | +| 23:34 | Edited .kiro/specs/ha-consistency-invariants/requirements.md | inline fix | ~118 | +| 23:34 | Edited .kiro/specs/ha-consistency-invariants/research.md | modified Verdict() | ~265 | +| 23:35 | Edited .kiro/specs/ha-consistency-invariants/research.md | inline fix | ~122 | +| 23:35 | Edited .kiro/specs/ha-consistency-invariants/research.md | inline fix | ~77 | +| 23:35 | Edited .kiro/specs/ha-consistency-invariants/research.md | "restore_job" → "irrevocable" | ~149 | +| 23:05 | User decision: provisional-state model for Req 2.4 (memory=provisional view, committed WAL=authoritative) replaces hook inversion; Req 2.4/2.5/2.7 amended, egress gating workstream added | requirements.md, research.md, cerebrum.md | §C reconciliation now mandatory core | ~20k | +| 23:35 | Created ../../../../../claude/.claude/projects/-home-rshen-projects-xce-xce/memory/project_ha_consistency_invariants.md | — | ~532 | +| 23:36 | Edited ../../../../../claude/.claude/projects/-home-rshen-projects-xce-xce/memory/MEMORY.md | inline fix | ~59 | +| 23:36 | Session end: 25 writes across 7 files (brief.md, project_ha_consistency_invariants.md, product.md, spec.json, requirements.md) | 30 reads | ~96101 tok | +| 23:38 | Edited .kiro/specs/ha-consistency-invariants/research.md | 1→2 lines | ~442 | +| 23:20 | STM evaluation for provisional-state mechanism: rejected full STM, adopted ARIES/MVCC-lite (committed-view + undo log) as design direction | research.md, cerebrum.md | recorded in design research item 1 | ~8k | +| 23:39 | Session end: 26 writes across 7 files (brief.md, project_ha_consistency_invariants.md, product.md, spec.json, requirements.md) | 30 reads | ~96574 tok | +| 23:43 | Edited .kiro/specs/ha-consistency-invariants/research.md | "t span syscalls and degra" → "t span syscalls), C ecosy" | ~371 | +| 23:43 | Edited .kiro/specs/ha-consistency-invariants/research.md | inline fix | ~281 | +| 23:35 | User reframing: replication = failover/recovery, not transactions. Dropped undo-log/ARIES direction; kept only watermark egress filter; discard via recovery mechanics; gap-4 alternative = reconcile-at-rejoin (Raft commitIndex volatile) | research.md, cerebrum.md | design direction simplified | ~10k | +| 23:44 | Session end: 28 writes across 7 files (brief.md, project_ha_consistency_invariants.md, product.md, spec.json, requirements.md) | 30 reads | ~97272 tok | +| 23:56 | Created .kiro/steering/roadmap.md | — | ~766 | +| 23:56 | Edited .kiro/specs/ha-consistency-invariants/research.md | 1→3 lines | ~155 | +| 23:50 | Created .kiro/steering/roadmap.md with backlog; added worker-rejoin-resync (long-planned, no effort) + 4 other deferred items | roadmap.md, research.md | discoverable by kiro-discovery re-entry | ~5k | +| 23:57 | Session end: 30 writes across 8 files (brief.md, project_ha_consistency_invariants.md, product.md, spec.json, requirements.md) | 30 reads | ~98258 tok | +| 23:59 | Created .kiro/steering/roadmap.md | — | ~1655 | +| 23:59 | Created src/docs/FUTURE_WORK.md | — | ~100 | +| 00:10 | Merged src/docs/FUTURE_WORK.md (8 items, 2026-05-12) into .kiro/steering/roadmap.md as single future-work doc; old file → redirect stub; §2 marked superseded by Req 5 | roadmap.md, src/docs/FUTURE_WORK.md, anatomy.md | one canonical backlog | ~6k | +| 00:01 | Session end: 32 writes across 9 files (brief.md, project_ha_consistency_invariants.md, product.md, spec.json, requirements.md) | 31 reads | ~100138 tok | +| 00:10 | Edited .kiro/steering/roadmap.md | inline fix | ~246 | +| 00:10 | Edited .kiro/specs/ha-consistency-invariants/research.md | 1→2 lines | ~310 | +| 07:20 | Evaluated xzarray shadow for provisional-state: structural-only COW, dormant (no prod callers); not fit for egress/rollback, real home = entity-bearing snapshots backlog | research.md, roadmap.md, cerebrum.md | watermark filter stands | ~15k | +| 00:11 | Session end: 34 writes across 9 files (brief.md, project_ha_consistency_invariants.md, product.md, spec.json, requirements.md) | 32 reads | ~100733 tok | +| 00:19 | Edited .kiro/steering/ha-async-io.md | inline fix | ~42 | +| 00:19 | Edited .kiro/specs/ha-consistency-invariants/research.md | 1→2 lines | ~311 | +| 07:45 | vcpu sizing question: default already 8 (steering said 4 — fixed); ACKs processed on iomgr (no wakeup deadlock); recommend commit-wait admission cap, not peer-scaling | ha-async-io.md, research.md, cerebrum.md | research item 3 inputs recorded | ~12k | +| 00:20 | Session end: 36 writes across 10 files (brief.md, project_ha_consistency_invariants.md, product.md, spec.json, requirements.md) | 32 reads | ~101110 tok | +| 00:23 | Edited .kiro/specs/ha-consistency-invariants/research.md | inline fix | ~253 | +| 00:24 | Edited .kiro/specs/ha-consistency-invariants/research.md | inline fix | ~87 | +| 00:24 | Edited .kiro/specs/ha-consistency-invariants/research.md | inline fix | ~55 | +| 07:55 | Corrected stale verified-behavior #3 in research.md (default 4→8, liveness→throughput risk, iomgr ACK fact) + 2 'starvation' wording cleanups | research.md | doc consistent with verified code facts | ~3k | +| 00:25 | Session end: 39 writes across 10 files (brief.md, project_ha_consistency_invariants.md, product.md, spec.json, requirements.md) | 32 reads | ~101533 tok | +| 00:27 | Edited .kiro/specs/ha-consistency-invariants/research.md | inline fix | ~194 | +| 08:05 | User: vcpus is operator tuning (host+cluster+workload), 8 only fallback default; design must express commit-wait mechanisms relative to n_vcpus | research.md, cerebrum.md | research item 3(e) added | ~3k | +| 00:27 | Session end: 40 writes across 10 files (brief.md, project_ha_consistency_invariants.md, product.md, spec.json, requirements.md) | 32 reads | ~101741 tok | +| 00:32 | Edited .kiro/specs/ha-consistency-invariants/requirements.md | inline fix | ~74 | +| 00:32 | Edited .kiro/specs/ha-consistency-invariants/requirements.md | 1→2 lines | ~160 | +| 00:32 | Edited .kiro/specs/ha-consistency-invariants/requirements.md | inline fix | ~140 | +| 00:32 | Edited .kiro/specs/ha-consistency-invariants/research.md | 1→3 lines | ~146 | +| 00:32 | Edited .kiro/steering/roadmap.md | inline fix | ~120 | +| 08:20 | User decision: facts retained+retried until committed (Req 2.8 added, 2.2 scoped to requester ops); worker-rejoin-resync designated backstop | requirements.md, research.md, roadmap.md, cerebrum.md | Req 2.2 semantics settled | ~8k | +| 00:33 | Session end: 45 writes across 10 files (brief.md, project_ha_consistency_invariants.md, product.md, spec.json, requirements.md) | 32 reads | ~102426 tok | +| 00:41 | Session end: 45 writes across 10 files (brief.md, project_ha_consistency_invariants.md, product.md, spec.json, requirements.md) | 32 reads | ~102426 tok | +| 00:47 | Edited .kiro/specs/ha-consistency-invariants/research.md | "mark_job_*" → "pending facts" | ~177 | +| 00:47 | Edited .kiro/specs/ha-consistency-invariants/research.md | inline fix | ~67 | +| 00:47 | Edited .kiro/specs/ha-consistency-invariants/research.md | inline fix | ~108 | +| 08:40 | Four design decisions locked: log-is-the-queue (no fact timeout), crash-loss OK until resync, self-restart on demotion, no-op own-term entry | research.md, cerebrum.md | proceeding to spec-design | ~6k | +| 00:53 | Created .kiro/specs/ha-consistency-invariants/design.md | — | ~8379 | +| 00:53 | Edited .kiro/specs/ha-consistency-invariants/research.md | added error handling | ~389 | +| 00:53 | Edited .kiro/specs/ha-consistency-invariants/spec.json | 12→12 lines | ~75 | +| 09:35 | kiro-spec-design ha-consistency-invariants: design.md written (commit engine + 9 components, 4-phase migration), review gate passed, reqs auto-approved (-y) | design.md, research.md, spec.json | phase=design-generated | ~60k | +| 00:54 | Session end: 51 writes across 11 files (brief.md, project_ha_consistency_invariants.md, product.md, spec.json, requirements.md) | 37 reads | ~121177 tok | +| 01:34 | Edited .kiro/specs/ha-consistency-invariants/design.md | 4→9 lines | ~469 | +| 09:50 | User: job/queue/host control ops = commit-first-then-reply; added explicit Reply-Ordering Contract to design.md Write-Path Classification | design.md, cerebrum.md | jobdispatch classification deferred to task verification | ~4k | +| 01:35 | Session end: 52 writes across 11 files (brief.md, project_ha_consistency_invariants.md, product.md, spec.json, requirements.md) | 37 reads | ~121679 tok | +| 01:45 | Created .kiro/specs/ha-commit-engine/brief.md | — | ~627 | +| 01:45 | Created .kiro/specs/ha-commit-barrier-rollout/brief.md | — | ~668 | +| 01:45 | Created .kiro/specs/ha-single-leader-role/brief.md | — | ~666 | +| 01:45 | Created .kiro/specs/ha-convergence-recovery/brief.md | — | ~795 | +| 01:46 | Edited .kiro/steering/roadmap.md | expanded (+7 lines) | ~316 | +| 01:46 | Edited .kiro/specs/ha-consistency-invariants/spec.json | modified spec() | ~135 | +| 10:15 | Decomposed ha-consistency-invariants into 4 sub-specs (user choice): briefs written, roadmap Specs section added, umbrella spec.json marked contract-only | 4x brief.md, roadmap.md, spec.json, cerebrum.md | next: kiro-spec-batch | ~25k | +| 01:46 | Created ../../../../../claude/.claude/projects/-home-rshen-projects-xce-xce/memory/project_ha_consistency_invariants.md | — | ~439 | +| 01:47 | Edited ../../../../../claude/.claude/projects/-home-rshen-projects-xce-xce/memory/MEMORY.md | inline fix | ~65 | +| 01:47 | Session end: 60 writes across 11 files (brief.md, project_ha_consistency_invariants.md, product.md, spec.json, requirements.md) | 37 reads | ~125645 tok | +| 02:01 | Created .kiro/specs/ha-commit-engine/requirements.md | — | ~2896 | +| 02:04 | Created .kiro/specs/ha-commit-engine/design.md | — | ~8018 | +| 02:05 | Created .kiro/specs/ha-commit-engine/research.md | — | ~1435 | +| 02:06 | Created .kiro/specs/ha-commit-engine/tasks.md | — | ~2861 | +| 02:07 | Created .kiro/specs/ha-commit-engine/spec.json | — | ~140 | +| 09:07 | Created full ha-commit-engine spec (sub-spec 1/4 of ha-consistency-invariants umbrella): spec.json, requirements.md (7 reqs/20 criteria, umbrella-traced), design.md (4 components, commit.h verbatim), research.md (slice verification), tasks.md (6 major/11 sub, TDD ordered), all approvals auto-set | .kiro/specs/ha-commit-engine/* | done | ~60k | +| 02:09 | Session end: 65 writes across 12 files (brief.md, project_ha_consistency_invariants.md, product.md, spec.json, requirements.md) | 52 reads | ~177500 tok | +| 02:21 | Created .kiro/specs/ha-commit-barrier-rollout/spec.json | — | ~144 | +| 02:21 | Created .kiro/specs/ha-commit-barrier-rollout/requirements.md | — | ~3394 | +| 02:24 | Created .kiro/specs/ha-convergence-recovery/requirements.md | — | ~3825 | +| 02:25 | Created .kiro/specs/ha-convergence-recovery/research.md | — | ~3779 | +| 02:26 | Created .kiro/specs/ha-commit-barrier-rollout/design.md | — | ~10973 | +| 02:28 | Created .kiro/specs/ha-commit-barrier-rollout/research.md | — | ~3917 | +| 02:28 | Created .kiro/specs/ha-convergence-recovery/design.md | — | ~10133 | +| 02:29 | Created .kiro/specs/ha-commit-barrier-rollout/tasks.md | — | ~3699 | +| 02:30 | Created .kiro/specs/ha-commit-barrier-rollout/spec.json | — | ~143 | +| 02:30 | Created .kiro/specs/ha-convergence-recovery/tasks.md | — | ~3536 | +| 09:45 | Generated full spec for ha-commit-barrier-rollout (sub-spec 2/4 of ha-consistency-invariants): requirements (5 reqs/18 criteria, EARS, umbrella-traced 2.1/2.2/2.8/5.1-5.3), design (6 components, verified classification table + handler-barrier mechanism), research (verified anchors 2026-06-11), tasks (7 major/16 sub, TDD, exhaustive xce_reply sweep task), spec.json all-approved | .kiro/specs/ha-commit-barrier-rollout/{spec.json,requirements.md,design.md,research.md,tasks.md} | ok | ~60k | +| 02:30 | Created .kiro/specs/ha-convergence-recovery/spec.json | — | ~142 | +| 09:25 | Created full spec for ha-convergence-recovery (sub-spec 4/4 of ha-consistency-invariants): requirements (9 reqs/26 criteria), research (anchor verification), design (7 components), tasks (8 groups/13 sub-tasks), spec.json approved+ready | .kiro/specs/ha-convergence-recovery/* | done | ~60k | +| 02:32 | Session end: 76 writes across 12 files (brief.md, project_ha_consistency_invariants.md, product.md, spec.json, requirements.md) | 60 reads | ~169216 tok | +| 02:41 | Created .kiro/specs/ha-single-leader-role/spec.json | — | ~142 | +| 02:42 | Created .kiro/specs/ha-single-leader-role/requirements.md | — | ~2322 | +| 02:42 | Edited .kiro/specs/ha-single-leader-role/spec.json | 7→7 lines | ~50 | +| 02:43 | Created .kiro/specs/ha-single-leader-role/research.md | — | ~4235 | +| 02:46 | Created .kiro/specs/ha-single-leader-role/design.md | — | ~9191 | +| 02:47 | Edited .kiro/specs/ha-single-leader-role/design.md | inline fix | ~161 | +| 02:47 | Edited .kiro/specs/ha-single-leader-role/spec.json | 11→11 lines | ~69 | +| 02:48 | Created .kiro/specs/ha-single-leader-role/tasks.md | — | ~3424 | +| 02:49 | Edited .kiro/specs/ha-single-leader-role/tasks.md | inline fix | ~136 | +| 02:49 | Created .kiro/specs/ha-single-leader-role/spec.json | — | ~142 | +| 12:45 | Created full spec ha-single-leader-role (sub-spec 3/4 of ha-consistency-invariants): requirements (8 EARS criteria ← umbrella 1.1-1.5/3.1-3.3), research (verified anchor table + COMMITTING census: ha.c 23 refs, 10 test files, 4 docs), design (7 components, WAL_NOOP=40, raft_cb_become_leader rewrite, deletions), tasks (6 majors/11 subs, TDD, grep gate) | .kiro/specs/ha-single-leader-role/{spec.json,requirements.md,research.md,design.md,tasks.md} | all approvals true, ready_for_implementation | ~60k | +| 02:56 | Edited .kiro/specs/ha-consistency-invariants/design.md | modified Classification() | ~175 | +| 03:00 | Edited .kiro/specs/ha-commit-engine/design.md | 2→4 lines | ~84 | +| 03:00 | Edited .kiro/specs/ha-commit-engine/design.md | inline fix | ~79 | +| 03:01 | Edited .kiro/specs/ha-commit-barrier-rollout/design.md | 1→3 lines | ~74 | +| 03:01 | Edited .kiro/specs/ha-commit-barrier-rollout/design.md | "repl.h" → "entry_lsn" | ~75 | +| 03:01 | Edited .kiro/specs/ha-convergence-recovery/design.md | inline fix | ~92 | +| 03:01 | Edited .kiro/specs/ha-convergence-recovery/tasks.md | inline fix | ~115 | +| 03:01 | Edited .kiro/specs/ha-convergence-recovery/design.md | 2→4 lines | ~169 | +| 03:01 | Edited .kiro/specs/ha-convergence-recovery/design.md | inline fix | ~184 | +| 03:02 | Edited .kiro/specs/ha-convergence-recovery/tasks.md | "on_standby_connected" → "raft_cb_become_leader" | ~118 | +| 03:02 | Edited .kiro/specs/ha-convergence-recovery/design.md | modified task() | ~155 | +| 05:56 | Edited .kiro/specs/ha-convergence-recovery/design.md | inline fix | ~141 | +| 05:57 | Edited .kiro/steering/roadmap.md | 6→8 lines | ~365 | +| 11:40 | kiro-spec-batch complete: 4 sub-specs generated (3 waves), cross-spec review passed after 6 doc fixes (1 by fix-agent before spend limit, rest verified/applied); roadmap marked [x] | 4 spec dirs, roadmap.md, umbrella design.md | 51 sub-tasks total, ready for /kiro-impl ha-commit-engine | ~700k | +| 05:57 | Session end: 99 writes across 12 files (brief.md, project_ha_consistency_invariants.md, product.md, spec.json, requirements.md) | 69 reads | ~240145 tok | diff --git a/.wolf/token-ledger.json b/.wolf/token-ledger.json index a7e2cd0..ab0eaf4 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": 36275695, - "total_reads": 7687, - "total_writes": 12986, - "total_sessions": 83, - "anatomy_hits": 6152, - "anatomy_misses": 1437, - "repeated_reads_blocked": 28002, - "estimated_savings_vs_bare_cli": 339735036 + "total_tokens_estimated": 40120776, + "total_reads": 9453, + "total_writes": 14282, + "total_sessions": 90, + "anatomy_hits": 6750, + "anatomy_misses": 2536, + "repeated_reads_blocked": 30065, + "estimated_savings_vs_bare_cli": 367936106 }, "sessions": [ { @@ -115979,6 +115979,17898 @@ "repeated_reads_blocked": 5, "anatomy_lookups": 4 } + }, + { + "id": "session-2026-06-10-2005", + "started": "2026-06-10T03:05:15.158Z", + "ended": "2026-06-10T04:19:29.164Z", + "reads": [ + { + "file": "/tmp/claude-1000/-home-rshen-projects-xce-worktrees-persistent-ha/5f840ae7-731a-4514-9c60-78d409e11dda/tasks/bvwlwgoup.output", + "tokens_estimated": 0, + "was_repeated": false, + "anatomy_had_description": false + }, + { + "file": "/home/rshen/projects/xce/worktrees/persistent_ha/.kiro/specs/ha-repl-hardening/tasks.md", + "tokens_estimated": 4464, + "was_repeated": true, + "anatomy_had_description": false + }, + { + "file": "/home/rshen/projects/xce/worktrees/persistent_ha/src/controller/ha.c", + "tokens_estimated": 40632, + "was_repeated": true, + "anatomy_had_description": false + }, + { + "file": "/home/rshen/projects/xce/worktrees/persistent_ha/src/controller/testsuite/test_ha_connection_reuse.c", + "tokens_estimated": 6320, + "was_repeated": true, + "anatomy_had_description": false + }, + { + "file": "/home/rshen/projects/xce/worktrees/persistent_ha/src/tools/xce-build.sh", + "tokens_estimated": 0, + "was_repeated": false, + "anatomy_had_description": false + }, + { + "file": "/home/rshen/projects/xce/worktrees/persistent_ha/.claude/skills/xce-build/SKILL.md", + "tokens_estimated": 112, + "was_repeated": false, + "anatomy_had_description": false + }, + { + "file": "/home/claude/.claude/projects/-home-rshen-projects-xce-worktrees-persistent-ha/d1286bee-4e08-4c6f-80dd-0fb0dc613333/tool-results/b5j0ecdqn.txt", + "tokens_estimated": 0, + "was_repeated": true, + "anatomy_had_description": false + }, + { + "file": "/home/rshen/projects/xce/worktrees/persistent_ha/src/controller/config_repl.c", + "tokens_estimated": 14812, + "was_repeated": false, + "anatomy_had_description": false + }, + { + "file": "/home/rshen/projects/xce/worktrees/persistent_ha/src/scheduler/src/scheduler.c", + "tokens_estimated": 0, + "was_repeated": true, + "anatomy_had_description": false + }, + { + "file": "/home/rshen/projects/xce/worktrees/persistent_ha/src/scheduler/include/scheduler.h", + "tokens_estimated": 0, + "was_repeated": false, + "anatomy_had_description": false + }, + { + "file": "/home/rshen/projects/xce/worktrees/persistent_ha/src/lib/resobj.c", + "tokens_estimated": 0, + "was_repeated": false, + "anatomy_had_description": false + } + ], + "writes": [ + { + "file": "/home/rshen/projects/xce/worktrees/persistent_ha/src/controller/testsuite/test_ha_connection_reuse.c", + "tokens_estimated": 68, + "action": "edit" + }, + { + "file": "/home/rshen/projects/xce/worktrees/persistent_ha/src/controller/testsuite/test_ha_connection_reuse.c", + "tokens_estimated": 68, + "action": "edit" + }, + { + "file": "/home/rshen/projects/xce/worktrees/persistent_ha/src/controller/cluster.c", + "tokens_estimated": 94, + "action": "edit" + }, + { + "file": "/home/rshen/projects/xce/worktrees/persistent_ha/src/controller/cluster.c", + "tokens_estimated": 99, + "action": "edit" + }, + { + "file": "/home/rshen/projects/xce/worktrees/persistent_ha/src/controller/config_repl.c", + "tokens_estimated": 110, + "action": "edit" + }, + { + "file": "/home/rshen/projects/xce/worktrees/persistent_ha/src/controller/ha.c", + "tokens_estimated": 110, + "action": "edit" + }, + { + "file": "/home/rshen/projects/xce/worktrees/persistent_ha/src/controller/ha.c", + "tokens_estimated": 34, + "action": "edit" + }, + { + "file": "/home/rshen/projects/xce/worktrees/persistent_ha/src/controller/ha.h", + "tokens_estimated": 190, + "action": "edit" + }, + { + "file": "/home/rshen/projects/xce/worktrees/persistent_ha/src/scheduler/src/scheduler.c", + "tokens_estimated": 345, + "action": "edit" + }, + { + "file": "/home/rshen/projects/xce/worktrees/persistent_ha/src/scheduler/src/scheduler.c", + "tokens_estimated": 248, + "action": "edit" + }, + { + "file": "/home/rshen/projects/xce/worktrees/persistent_ha/src/scheduler/src/scheduler.c", + "tokens_estimated": 100, + "action": "edit" + }, + { + "file": "/home/rshen/projects/xce/worktrees/persistent_ha/src/scheduler/src/scheduler.c", + "tokens_estimated": 106, + "action": "edit" + } + ], + "totals": { + "input_tokens_estimated": 66340, + "output_tokens_estimated": 1572, + "reads_count": 11, + "writes_count": 12, + "repeated_reads_blocked": 8, + "anatomy_lookups": 4 + } + }, + { + "id": "session-2026-06-10-2005", + "started": "2026-06-10T03:05:15.158Z", + "ended": "2026-06-10T04:22:38.200Z", + "reads": [ + { + "file": "/tmp/claude-1000/-home-rshen-projects-xce-worktrees-persistent-ha/5f840ae7-731a-4514-9c60-78d409e11dda/tasks/bvwlwgoup.output", + "tokens_estimated": 0, + "was_repeated": false, + "anatomy_had_description": false + }, + { + "file": "/home/rshen/projects/xce/worktrees/persistent_ha/.kiro/specs/ha-repl-hardening/tasks.md", + "tokens_estimated": 4464, + "was_repeated": true, + "anatomy_had_description": false + }, + { + "file": "/home/rshen/projects/xce/worktrees/persistent_ha/src/controller/ha.c", + "tokens_estimated": 40632, + "was_repeated": true, + "anatomy_had_description": false + }, + { + "file": "/home/rshen/projects/xce/worktrees/persistent_ha/src/controller/testsuite/test_ha_connection_reuse.c", + "tokens_estimated": 6320, + "was_repeated": true, + "anatomy_had_description": false + }, + { + "file": "/home/rshen/projects/xce/worktrees/persistent_ha/src/tools/xce-build.sh", + "tokens_estimated": 0, + "was_repeated": false, + "anatomy_had_description": false + }, + { + "file": "/home/rshen/projects/xce/worktrees/persistent_ha/.claude/skills/xce-build/SKILL.md", + "tokens_estimated": 112, + "was_repeated": false, + "anatomy_had_description": false + }, + { + "file": "/home/claude/.claude/projects/-home-rshen-projects-xce-worktrees-persistent-ha/d1286bee-4e08-4c6f-80dd-0fb0dc613333/tool-results/b5j0ecdqn.txt", + "tokens_estimated": 0, + "was_repeated": true, + "anatomy_had_description": false + }, + { + "file": "/home/rshen/projects/xce/worktrees/persistent_ha/src/controller/config_repl.c", + "tokens_estimated": 14812, + "was_repeated": false, + "anatomy_had_description": false + }, + { + "file": "/home/rshen/projects/xce/worktrees/persistent_ha/src/scheduler/src/scheduler.c", + "tokens_estimated": 0, + "was_repeated": true, + "anatomy_had_description": false + }, + { + "file": "/home/rshen/projects/xce/worktrees/persistent_ha/src/scheduler/include/scheduler.h", + "tokens_estimated": 0, + "was_repeated": false, + "anatomy_had_description": false + }, + { + "file": "/home/rshen/projects/xce/worktrees/persistent_ha/src/lib/resobj.c", + "tokens_estimated": 0, + "was_repeated": false, + "anatomy_had_description": false + } + ], + "writes": [ + { + "file": "/home/rshen/projects/xce/worktrees/persistent_ha/src/controller/testsuite/test_ha_connection_reuse.c", + "tokens_estimated": 68, + "action": "edit" + }, + { + "file": "/home/rshen/projects/xce/worktrees/persistent_ha/src/controller/testsuite/test_ha_connection_reuse.c", + "tokens_estimated": 68, + "action": "edit" + }, + { + "file": "/home/rshen/projects/xce/worktrees/persistent_ha/src/controller/cluster.c", + "tokens_estimated": 94, + "action": "edit" + }, + { + "file": "/home/rshen/projects/xce/worktrees/persistent_ha/src/controller/cluster.c", + "tokens_estimated": 99, + "action": "edit" + }, + { + "file": "/home/rshen/projects/xce/worktrees/persistent_ha/src/controller/config_repl.c", + "tokens_estimated": 110, + "action": "edit" + }, + { + "file": "/home/rshen/projects/xce/worktrees/persistent_ha/src/controller/ha.c", + "tokens_estimated": 110, + "action": "edit" + }, + { + "file": "/home/rshen/projects/xce/worktrees/persistent_ha/src/controller/ha.c", + "tokens_estimated": 34, + "action": "edit" + }, + { + "file": "/home/rshen/projects/xce/worktrees/persistent_ha/src/controller/ha.h", + "tokens_estimated": 190, + "action": "edit" + }, + { + "file": "/home/rshen/projects/xce/worktrees/persistent_ha/src/scheduler/src/scheduler.c", + "tokens_estimated": 345, + "action": "edit" + }, + { + "file": "/home/rshen/projects/xce/worktrees/persistent_ha/src/scheduler/src/scheduler.c", + "tokens_estimated": 248, + "action": "edit" + }, + { + "file": "/home/rshen/projects/xce/worktrees/persistent_ha/src/scheduler/src/scheduler.c", + "tokens_estimated": 100, + "action": "edit" + }, + { + "file": "/home/rshen/projects/xce/worktrees/persistent_ha/src/scheduler/src/scheduler.c", + "tokens_estimated": 106, + "action": "edit" + } + ], + "totals": { + "input_tokens_estimated": 66340, + "output_tokens_estimated": 1572, + "reads_count": 11, + "writes_count": 12, + "repeated_reads_blocked": 8, + "anatomy_lookups": 4 + } + }, + { + "id": "session-2026-06-10-2005", + "started": "2026-06-10T03:05:15.158Z", + "ended": "2026-06-10T04:50:30.679Z", + "reads": [ + { + "file": "/tmp/claude-1000/-home-rshen-projects-xce-worktrees-persistent-ha/5f840ae7-731a-4514-9c60-78d409e11dda/tasks/bvwlwgoup.output", + "tokens_estimated": 0, + "was_repeated": false, + "anatomy_had_description": false + }, + { + "file": "/home/rshen/projects/xce/worktrees/persistent_ha/.kiro/specs/ha-repl-hardening/tasks.md", + "tokens_estimated": 4464, + "was_repeated": true, + "anatomy_had_description": false + }, + { + "file": "/home/rshen/projects/xce/worktrees/persistent_ha/src/controller/ha.c", + "tokens_estimated": 40638, + "was_repeated": true, + "anatomy_had_description": false + }, + { + "file": "/home/rshen/projects/xce/worktrees/persistent_ha/src/controller/testsuite/test_ha_connection_reuse.c", + "tokens_estimated": 6320, + "was_repeated": true, + "anatomy_had_description": false + }, + { + "file": "/home/rshen/projects/xce/worktrees/persistent_ha/src/tools/xce-build.sh", + "tokens_estimated": 0, + "was_repeated": false, + "anatomy_had_description": false + }, + { + "file": "/home/rshen/projects/xce/worktrees/persistent_ha/.claude/skills/xce-build/SKILL.md", + "tokens_estimated": 112, + "was_repeated": false, + "anatomy_had_description": false + }, + { + "file": "/home/claude/.claude/projects/-home-rshen-projects-xce-worktrees-persistent-ha/d1286bee-4e08-4c6f-80dd-0fb0dc613333/tool-results/b5j0ecdqn.txt", + "tokens_estimated": 0, + "was_repeated": true, + "anatomy_had_description": false + }, + { + "file": "/home/rshen/projects/xce/worktrees/persistent_ha/src/controller/config_repl.c", + "tokens_estimated": 14877, + "was_repeated": true, + "anatomy_had_description": false + }, + { + "file": "/home/rshen/projects/xce/worktrees/persistent_ha/src/scheduler/src/scheduler.c", + "tokens_estimated": 0, + "was_repeated": true, + "anatomy_had_description": false + }, + { + "file": 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diff --git a/CLAUDE.md b/CLAUDE.md index 779ac00..b645dc6 100644 --- a/CLAUDE.md +++ b/CLAUDE.md @@ -7,80 +7,33 @@ This project uses OpenWolf for context management. Read and follow .wolf/OPENWOL # XCE Cluster Management System -## Overview -XCE is an HPC cluster management system providing job scheduling, queue management, and cluster resource control. The Go-based API/CLI tier fronts C system daemons (controller, worker, scheduler). +## Project Overview +XCE is an HPC cluster management system — Go API/CLI tier fronting C daemons (controller, worker, scheduler). Full context in `.kiro/steering/product.md`. -## Tech Stack -- **Go 1.23.4**: REST API server (`src/frontend/apiserver`), CLI tool (`src/frontend/xcecli`) -- **C (gnu17)**: Core daemons — controller, worker, scheduler, shared lib -- **Build**: Meson + Nix flakes for C components; `make` for Go components -- **Go key deps**: Gin v1.10.0, JWT v4, Zap logging, Viper config, Cobra CLI +## Engineering Guide -## Development Commands -```bash -# Build with /xce-build skill (debug + ASAN, clean build, runs tests) -/xce-build # Build all components + run all tests -/xce-build lib # Build libxce + run lib tests -/xce-build controller # Build lib + controller + run controller tests -/xce-build scheduler # Build lib + scheduler + run scheduler tests -/xce-build worker # Build lib + worker (no unit tests registered) -/xce-build apiserver # Build lib + apiserver + xcecli + run Go unit tests -/xce-build xcecli # Build xcecli only + run xcecli Go tests +For details on any topic below, read the corresponding steering file in `.kiro/steering/`. CLAUDE.md provides pointers, not duplicates. -``` +| Topic | Steering File | +|-------|---------------| +| Project purpose, HA phases, design decisions | `product.md` | +| Technology stack, build systems, key decisions | `tech.md` | +| Directory layout, naming conventions, test org | `structure.md` | +| Build commands, Nix flake, deploy, AppImage | `build-deployment.md` | +| REST handler pattern, daemon opcodes, Cap'n Proto | `api-standards.md` | +| HA protocol, async I/O, Raft election, heartbeat | `ha-async-io.md` | +| TDD rules, C + Go test patterns, coverage targets | `testing.md` | +| Error handling: Go ReturnError, C errnox, zap logging | `error-handling.md` | +| RBAC, JWT, auth backends, input validation, secrets | `security.md` | -## Test-Driven Development -Follow TDD strictly throughout the full development process: +## Key Rules (from steering — summarized for quick reference) -1. **Red** — Write a failing test that specifies the desired behaviour before writing any implementation code. -2. **Green** — Write the minimal implementation to make the test pass. Do not over-engineer. -3. **Refactor** — Clean up the implementation and tests while keeping all tests green. - -### Rules -- Never implement a feature without a corresponding test written first. -- Tests must be runnable without a live server or external services (use table-driven tests, stubs, and `t.TempDir()` for fixtures). -- A change is not complete until `make test` (and `make test-integration` where applicable) passes. -- For C components, add a test case in the relevant `testsuite/` before modifying the implementation. -- Tests live next to the code they cover (`_test.go` for Go, `testsuite/` for C). -- Keep test scope narrow — unit-test business logic; use integration tests for HTTP/API surface. - -## Architecture -``` -Request → Gin Router → Middleware (CORS/RateLimit/IPWhitelist/JWT) → RBAC Check → Controller → Services → In-Memory Store -``` -- **3 independent Go modules**: `apiserver`, `xcecli`, `bcctool` (no go.work) -- **Stateful API server**: in-memory stores seeded at startup via `store.LoadBuiltinData()` -- **Pluggable auth**: configfile / LDAP / OAuth2 / PAM (set in `config/auth.yaml`) -- **RBAC**: domain-based role-action-domain model loaded from `config/rbac.yaml` - -## Connection Model and Async I/O - -### Long-Lived Persistent Connections (CRITICAL) -All XCE daemon connections are **long-lived** — they are established once and reused for the lifetime of the role relationship: - -| Connection | Direction | Owner | Purpose | -|---|---|---|---| -| Controller primary → standby | Primary dials out during election | Primary (`ha->standby_endpoints`) | Config push, WAL replication, heartbeat | -| Controller standby ← primary | Inbound on standby listener | Standby (`primary_ctrl_fd`) | Receives ctrlhello, WAL, config, heartbeat | -| Primary → worker | Primary dials out | Primary (`c->workers[i].ep`) | Job dispatch, heartbeat | -| Scheduler → primary | Scheduler dials out | Scheduler | Schedule requests | -| API server → primary | API server dials out | API server backend | Job submit, cluster queries | - -Connections are **never** closed and re-opened between RPCs. Closing a connection signals a failure event (RDHUP) which triggers failover or reconnect logic. - -### Async Non-Blocking I/O Model (CRITICAL) -All C daemon I/O runs through **iomgr** (epoll-based) + **vtaskmgr** (thread pool): - -- **iomgr** — single-threaded epoll loop; dispatches inbound packets as vtasks; manages endpoint lifetime -- **vtaskmgr** — thread-pool executing vtask handlers; handlers must return quickly (no blocking I/O) -- **delaymgr** — timer thread for periodic/delayed tasks; the only place blocking operations (connect, file I/O) are permitted -- `xce_request(ep, &req)` — enqueues a packet to the endpoint's send buffer; **always non-blocking** -- `xce_reply(ep, host, &reply)` — enqueues a reply; **always non-blocking** - -**Never block in a vtask handler.** Blocking calls (connect, read, usleep) belong in delaymgr tasks or dedicated threads. - -### Primary Heartbeat to Standbys -The primary sends `OPCode_nop` to each standby every `heartbeat_interval_ms` via a self-perpetuating delaymgr one-shot task (`ha_start_primary_heartbeat`). The task re-arms itself only while role is PRIMARY or PRIMARY_COMMITTING — on demotion the loop stops automatically (no cancel API needed). This keeps the standby-side watchdog (`ha_arm_heartbeat_timeout_vtask`) from timing out during idle periods. +- **TDD mandatory**: red → green → refactor; test in `testsuite/` before C changes, `_test.go` before Go changes +- **Async I/O**: never block in vtask handlers; delaymgr for blocking ops. `xce_request`/`xce_reply` are always non-blocking +- **Connections are long-lived**: closing signals RDHUP failover. Inbound connections are vote-only; outbound carry all state push +- **Middleware chain** (non-negotiable): WhitelistURL → WhitelistIP → RateLimit → JWT → CORS → RBAC +- **Error pattern**: `ReturnError(code, msg, nil); return` — early return on every error +- **Build**: `/xce-build [component]` — debug + ASAN + tests. See `build-deployment.md` for full commands ## Key Files - `src/frontend/Makefile` — primary build/test orchestration @@ -145,7 +98,7 @@ Kiro-style Spec-Driven Development on an agentic SDLC - Follow the user's instructions precisely, and within that scope act autonomously: gather the necessary context and complete the requested work end-to-end in this run, asking questions only when essential information is missing or the instructions are critically ambiguous. ## Steering Configuration -- Load entire `.kiro/steering/` as project memory -- Core files: `product.md`, `tech.md`, `structure.md` -- XCE custom files: `testing.md`, `error-handling.md`, `security.md` -- Add new custom files via `/kiro-steering-custom` +- Load entire `.kiro/steering/` as project memory — all `.md` files are authoritative +- Core: `product.md`, `tech.md`, `structure.md` +- Custom: `testing.md`, `error-handling.md`, `security.md`, `ha-async-io.md`, `api-standards.md`, `build-deployment.md` +- Add new custom files via `/kiro-steering-custom`; sync existing via `/kiro-steering` diff --git a/src/controller/CLAUDE.md b/src/controller/CLAUDE.md index f03c3bf..228ccba 100644 --- a/src/controller/CLAUDE.md +++ b/src/controller/CLAUDE.md @@ -5,10 +5,9 @@ C daemon managing cluster-level job and queue operations. Acts as the central co ## Build ```bash -# From workspace root -nix develop -meson build && ninja -C build +/xce-build controller # debug + ASAN + clean build + runs tests ``` +For full build system details, see `.kiro/steering/build-deployment.md`. ## Architecture Core source files handle distinct domains: @@ -25,7 +24,9 @@ Links against `libxce` from `src/lib/`. - Component-specific headers in `include/` - Shared types defined in `src/include/xce/` (libxce) -## HA Protocol Verification +## HA Protocol + +See `.kiro/steering/ha-async-io.md` for the full HA protocol reference: async I/O model (iomgr/vtaskmgr/delaymgr), connection ownership, Raft election, heartbeat model, two-tier replication consistency, dispatch gate, and TLA+ variable mapping. The TLA+ safety invariants and protocol verification checklist below are the authoritative controller-specific verification gates — keep them here. ### Raft TLA+ Formal Specification @@ -91,94 +92,9 @@ When modifying HA protocol code (election, replication, heartbeat), verify: ## HA Design Constraints -### Inbound vs. Outbound Connection Ownership (CRITICAL) - -**Strict rule: inbound connections are for voting only. All persistent control channels are outbound from the primary.** - -| Connection type | Direction | Purpose | Who closes | -|---|---|---|---| -| Vote RPC | Standby → Primary (outbound from standby) | `OPCode_requestVote` + reply only | Remote closes after reply | -| Standby control channel | Primary → Standby (outbound from primary) | ctrlhello, config push, WAL replication, heartbeat | `vote_ep_err_handler` / `standby_ep_err_handler_primary` on disconnect | - -Rules: -- **Inbound vote connections** (accepted on the listener) are used **exclusively** for the vote exchange. After the reply is sent the primary does NOT reuse the connection for config/replication. The inbound ep is left open until the remote closes it. -- **Primary never uses an inbound connection to push state.** All state push (ctrlhello, config, WAL, heartbeat nop) goes over **outbound connections** stored in `ha->standby_endpoints`. -- During election: candidate opens outgoing vote connections (one per peer). After winning, `raft_cb_become_leader` promotes surviving vote connections to `standby_endpoints`. -- Late joiners: the primary's heartbeat task (`primary_heartbeat_fn`) scans the peers list and **opens a fresh outbound connection** to any peer absent from `standby_endpoints`. On connect, `on_standby_connected` sends ctrlhello and registers the ep. -- `CTRL_STANDBY` must not call `ha_find_and_connect_to_primary` or schedule `fetch_config_from_primary` after an election result — the primary will connect to it. - -### Asynchronous, Non-Blocking I/O (CRITICAL) -All inter-controller communication uses iomgr (epoll-based) and vtaskmgr: -- `iomgr` dispatches inbound packets to vtask handlers — never block inside a vtask. -- `vtaskmgr` runs handlers on a thread pool; each handler must return quickly. -- Outgoing sends use `xce_request(ep, &req)` which enqueues to the endpoint's send buffer — non-blocking. -- Blocking I/O (e.g., `fetch_config_from_primary`, `ha_find_and_connect_to_primary`) is only permitted from `delaymgr` worker threads, **never** from iomgr/vtask context. - -### Heartbeat Model - -XCE uses a bidirectional heartbeat model aligned with Raft's AppendEntries: -- The **primary** sends periodic heartbeats (`OPCode_nop`) to all standbys via `ha_start_primary_heartbeat` (delaymgr task, interval=3s). During `CTRL_PRIMARY_COMMITTING`, this also serves as the replication driver — the primary evaluates standby state from heartbeat replies and pushes config/WAL/snapshot as needed. -- The **standby** replies to each heartbeat with its current `(applied_lsn, config_tag)` in `RequestReply.stateReport`. This gives the primary continuous visibility into standby convergence. -- The **standby** also arms a liveness watchdog (`ha_arm_heartbeat_timeout_vtask`) when entering `CTRL_STANDBY`. If no message arrives from the primary within `heartbeat_timeout_ms` (10s), it triggers re-election via `ha_on_primary_ctrl_fd_rdhup`. -- `raft.c` (the election library) is election-only. Heartbeat and replication logic belongs in the HA layer (`ha.c`, `config_repl.c`). - -### Connection Ownership -- Promoted vote connections (`ha->standby_endpoints`): owned by `vote_ep_err_handler`; freed when the standby disconnects. -- Late-joiner inbound connections: owned by the cluster endpoint array (`c->endpoints`); the `ep_private_t` role identifies `HostRole_controller` for cleanup in `handle_endpoint_error`. -- `ha->primary_ctrl_fd`: set by `handle_ctrlhello` on the standby when the first ctrlhello arrives; used by `ha_on_primary_ctrl_fd_rdhup` to trigger re-election on disconnect. - -## HA Cluster Deployment - -Use the `/xce-deploy-ha` skill to deploy a local 3-node HA cluster for testing: - -``` -/xce-deploy-ha localhost:9991 localhost:9992 localhost:9993 -``` - -**Prerequisites:** -- Build binary: `/xce-build controller` -- TLS certs and `cluster.bin` at `ha/data/` (already in repo) - -**Quick deploy (from repo root):** -```bash -# Deploy + start all 3 nodes with raft trace logging -bash src/tools/deploy-ha.sh \ - src/xce.build/controller/xce_controller \ - ha/data \ - /tmp/xce-deploy \ - "localhost:9991,localhost:9992,localhost:9993" - -VERBOSE=-vvv /tmp/xce-deploy/scripts/start.sh ctrl-1 & -sleep 0.5 -VERBOSE=-vvv /tmp/xce-deploy/scripts/start.sh ctrl-2 & -sleep 0.5 -VERBOSE=-vvv /tmp/xce-deploy/scripts/start.sh ctrl-3 & -``` - -**Verify health (after ~15s):** -```bash -# Primary elected and config pushed -grep -i "CTRL_PRIMARY\|Config committed" /tmp/xce-deploy/logs/ctrl-1.log | grep -v DEBUG3 -# Config files present on standbys -find /tmp/xce-deploy/controller/ctrl-2/conf /tmp/xce-deploy/controller/ctrl-3/conf -type f -``` - -**Clean restart** (keeps ctrl-1 config + all certs, wipes data/standby-conf/logs): -```bash -kill -9 $(pgrep xce_controller) 2>/dev/null || true -bash /tmp/xce-deploy/scripts/cleanup.sh -# Then restart nodes (no redeploy needed) -VERBOSE=-vvv /tmp/xce-deploy/scripts/start.sh ctrl-1 & -sleep 0.5; VERBOSE=-vvv /tmp/xce-deploy/scripts/start.sh ctrl-2 & -sleep 0.5; VERBOSE=-vvv /tmp/xce-deploy/scripts/start.sh ctrl-3 & -``` - -See `.claude/skills/xce-deploy-ha/SKILL.md` for full troubleshooting reference. +Covered in `.kiro/steering/ha-async-io.md` (connection ownership, async I/O, heartbeat, two-tier replication, dispatch gate) and `.kiro/steering/build-deployment.md` (deploy commands, cluster startup/restart/verification). The TLA+ safety invariants above remain the controller-specific verification reference. ## Key Files -- `src/controller/` — Controller source files -- `include/` — Controller-specific headers -- `src/tools/deploy-ha.sh` — HA cluster deploy script ## See Also - Shared library: `src/lib/CLAUDE.md` diff --git a/src/controller/config_repl.c b/src/controller/config_repl.c index acb1e13..5965f03 100644 --- a/src/controller/config_repl.c +++ b/src/controller/config_repl.c @@ -694,6 +694,17 @@ int handle_repl_config_push(cluster_t *c, endpoint_t *ep, xce_request_t *req) return -EINVAL; } + /* Req 1.3 (ha-heartbeat-liveness): any msg from primary resets standby + * liveness and steps down from CTRL_ELECTING (live primary discovered). */ + { + ctrl_role_t role = (ctrl_role_t)atomic_load_explicit( + &c->ha.role, memory_order_acquire); + if (role == CTRL_STANDBY) + ha_on_heartbeat_received(&c->ha); + else if (role == CTRL_ELECTING) + ha_discover_primary(&c->ha, c); + } + repl_config_push_req_t *rcpr = req->body.replconfigpushrequestmsg; if (!rcpr->raw_bytes || rcpr->raw_bytes_len == 0 || !rcpr->raw_sha256) { @@ -1404,6 +1415,9 @@ int (*xce_wal_stream_request_hook)(endpoint_t *ep, xce_request_t *req) = NULL; #endif /* send_wal_batch: enqueue a single OPCode_walCatchupEntry batch message. + * Entry payloads (raw_payload/raw_payload_len) travel as capnp Data via + * xce_wal_batch_req_raw (task 7.3) — the generated encode path cannot + * carry raw bytes (xce_data_t limitation, same as replConfigPush). * Does not free any memory — caller manages entry lifetime. * Returns 0 on success. */ static int send_wal_batch(endpoint_t *ep, @@ -1412,24 +1426,24 @@ static int send_wal_batch(endpoint_t *ep, if (n_entries <= 0) return 0; - /* Build the batch container entry */ - wal_catchup_entry_t batch; - memset(&batch, 0, sizeof(batch)); - batch.n_entries = n_entries; - batch.entries = entries; - - xce_request_t req; - memset(&req, 0, sizeof(req)); - req.opcode = OPCode_walCatchupEntry; - req.body_which = Request_body_nomsg; - req.body.walcatchupentrymsg = &batch; - #ifdef XCE_TESTING - if (xce_wal_stream_request_hook != NULL) + if (xce_wal_stream_request_hook != NULL) { + /* Build the batch container the hook expects */ + wal_catchup_entry_t batch; + memset(&batch, 0, sizeof(batch)); + batch.n_entries = n_entries; + batch.entries = entries; + + xce_request_t req; + memset(&req, 0, sizeof(req)); + req.opcode = OPCode_walCatchupEntry; + req.body_which = Request_body_walcatchupentrymsg; + req.body.walcatchupentrymsg = &batch; return xce_wal_stream_request_hook(ep, &req); + } #endif if (ep) - xce_request(ep, &req); + xce_wal_batch_req_raw(ep, entries, n_entries); return 0; } @@ -1505,7 +1519,7 @@ int ha_stream_wal_to_standby(endpoint_t *ep, const char *wal_path, if (batch_n > 0) { send_wal_batch(ep, batch_entries, batch_n); for (int bi = 0; bi < batch_n; bi++) { - free(batch_entries[bi]->payload); + free(batch_entries[bi]->raw_payload); free(batch_entries[bi]); } batch_n = 0; @@ -1525,10 +1539,12 @@ int ha_stream_wal_to_standby(endpoint_t *ep, const char *wal_path, if (pbuf) { ssize_t pr = pread(fd, pbuf, hdr.payload_len, (off_t)(off + sizeof(hdr))); - if (pr == (ssize_t)hdr.payload_len) - entry->payload = (xce_data_t *)pbuf; - else + if (pr == (ssize_t)hdr.payload_len) { + entry->raw_payload = pbuf; + entry->raw_payload_len = hdr.payload_len; + } else { free(pbuf); + } } } @@ -1541,7 +1557,7 @@ int ha_stream_wal_to_standby(endpoint_t *ep, const char *wal_path, batch_bytes >= WAL_STREAM_BATCH_BYTES) { send_wal_batch(ep, batch_entries, batch_n); for (int bi = 0; bi < batch_n; bi++) { - free(batch_entries[bi]->payload); + free(batch_entries[bi]->raw_payload); free(batch_entries[bi]); } batch_n = 0; @@ -1557,7 +1573,7 @@ int ha_stream_wal_to_standby(endpoint_t *ep, const char *wal_path, if (batch_n > 0) { send_wal_batch(ep, batch_entries, batch_n); for (int bi = 0; bi < batch_n; bi++) { - free(batch_entries[bi]->payload); + free(batch_entries[bi]->raw_payload); free(batch_entries[bi]); } } @@ -1610,17 +1626,14 @@ int ha_send_snapshot_to_standby(endpoint_t *ep, const char *snap_dir, uint64_t offset = 0; uint32_t chunk_index = 0; - /* Chunk the snapshot file and enqueue each chunk via xce_request(). - * Payload encoding uses NULL for now — the user-defined Data type in capnp - * (xce_data_t tagged union) requires a proper table dispatch for non-null - * payloads. This is a known limitation shared with wal_catchup_entry_t - * payload; both will be resolved when the capnp schema is updated to use - * the built-in capnp Data (List(UInt8)) type. */ + /* Chunk the snapshot file and enqueue each chunk with its file bytes. + * Payload travels as capnp Data via xce_snapshot_chunk_req_raw (task 7.2) + * — the generated encode path cannot carry raw bytes (xce_data_t + * limitation, same as replConfigPush). */ while (offset < total_size) { size_t chunk_len = (total_size - offset > SNAPSHOT_CHUNK_SIZE) ? SNAPSHOT_CHUNK_SIZE : (size_t)(total_size - offset); - /* Consume the file bytes to advance offset — data not used yet */ if (fread(buf, 1, chunk_len, f) != chunk_len) { rc = -EIO; break; @@ -1630,26 +1643,26 @@ int ha_send_snapshot_to_standby(endpoint_t *ep, const char *snap_dir, snapshot_transfer_t chunk; memset(&chunk, 0, sizeof(chunk)); - chunk.snapshot_lsn = checkpoint_lsn; - chunk.chunk_index = chunk_index; - chunk.chunk_offset = offset; - chunk.total_size = total_size; - chunk.is_last = is_last; - chunk.payload = NULL; /* encoding deferred */ - - xce_request_t req; - memset(&req, 0, sizeof(req)); - req.opcode = OPCode_snapshotTransfer; - req.body_which = Request_body_nomsg; - req.body.snapshottransfermsg = &chunk; + chunk.snapshot_lsn = checkpoint_lsn; + chunk.chunk_index = chunk_index; + chunk.chunk_offset = offset; + chunk.total_size = total_size; + chunk.is_last = is_last; + chunk.raw_payload = buf; /* borrowed for hook/encode only */ + chunk.raw_payload_len = chunk_len; #ifdef XCE_TESTING - if (xce_snapshot_chunk_hook) + if (xce_snapshot_chunk_hook) { + xce_request_t req; + memset(&req, 0, sizeof(req)); + req.opcode = OPCode_snapshotTransfer; + req.body_which = Request_body_snapshottransfermsg; + req.body.snapshottransfermsg = &chunk; xce_snapshot_chunk_hook(ep, &req); - else + } else #endif if (ep) - xce_request(ep, &req); + xce_snapshot_chunk_req_raw(ep, &chunk, buf, chunk_len); offset += chunk_len; chunk_index++; diff --git a/src/controller/ha.c b/src/controller/ha.c index 27a2c84..f34103a 100644 --- a/src/controller/ha.c +++ b/src/controller/ha.c @@ -540,7 +540,10 @@ static void raft_cb_become_leader(void *ctx, uint64_t term) ectx->votes[i].peer->hostname, (uint32_t)ectx->votes[i].peer->port); if (rc >= 0) - TRACE("HA: repl registered standby ep[%d] (slot %d)", i, rc); + INFO("HA: repl registered standby ep[%d] (slot %d, %s:%u)", + i, rc, + ectx->votes[i].peer->hostname, + ectx->votes[i].peer->port); else WARN("HA: repl_add_standby ep[%d] failed: %d", i, rc); } @@ -1489,6 +1492,38 @@ int ha_dispatch_repl_action_for_standby(ha_state_t *ha, * For CTRL_INIT / CTRL_ELECTING the allowlist is tighter: only * OP_requestVote and OP_probeConfigTag pass through. */ +/* ha_has_write_quorum — check whether the cluster has enough connected + * standbys to achieve majority for state-changing operations. + * + * Quorum = ceil(n_peers / 2) + 1 (self-vote included). + * Example: n_peers=3 → quorum=2 → need ≥1 connected standby. + * + * Called from ha_dispatch_gate for CTRL_PRIMARY — if the cluster loses + * majority (standby failures), write ops are rejected with -XCE_ERR_NOT_READY + * to preserve the majority-consistency invariant. + * + * Read-only queries (joblist, reslist, hostlist, etc.) remain available + * regardless of majority status — they don't mutate state. */ +static bool ha_has_write_quorum(ha_state_t *ha) +{ + if (!ha) + return false; + + /* Single-node cluster: no standbys needed — self is the majority. */ + if (ha->n_peers <= 1) + return true; + + /* Count connected standbys. standby_endpoints is populated by + * raft_cb_become_leader (promoted vote eps) and on_standby_connected + * (late joiners); removed by error handlers. */ + int connected = ha->standby_endpoints + ? ha->standby_endpoints->count : 0; + + /* Need at least n_peers/2 connected standbys to achieve quorum. + * Integer division: n_peers/2 for n_peers=3 → 1 standby minimum. */ + return connected >= (int)(ha->n_peers / 2); +} + int ha_dispatch_gate(ha_state_t *ha, int opcode) { ctrl_role_t role = @@ -1496,6 +1531,31 @@ int ha_dispatch_gate(ha_state_t *ha, int opcode) switch (role) { case CTRL_PRIMARY: + /* State-changing operations require majority so committed entries + * are durable across failover. Read-only queries and replication + * ops are always allowed. */ + if (!ha_has_write_quorum(ha)) { + switch (opcode) { + /* Replication ops — always allowed (they build majority) */ + 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 */ + case OPCode_get: + case OPCode_probeConfigTag: + return 0; + default: + return -XCE_ERR_NOT_READY; + } + } return 0; case CTRL_INIT: @@ -2623,12 +2683,18 @@ static int repl_ack_decode_and_dispatch(endpoint_t *ep, vote_ep_ctx_t *vctx) int peer_idx = vctx->peer_idx; uint64_t committed_lsn = 0; uint64_t committed_tag = 0; + uint64_t last_written = 0; /* latest WAL LSN — may be > committed */ #ifndef XCE_TESTING if (c) { committed_lsn = atomic_load_explicit(&c->persist.committed_lsn, memory_order_acquire); committed_tag = atomic_load_explicit(&ha->committed_config_tag, memory_order_acquire); + /* current_lsn is the next LSN to write; last written = current - 1. + * Read without lock — monotonic, approximate value is sufficient + * for the replication decision. */ + last_written = (c->persist.current_lsn > 0) + ? c->persist.current_lsn - 1 : 0; } #else /* In test mode, c may be NULL; caller sets ha fields directly */ @@ -2658,8 +2724,15 @@ 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; + ha_dispatch_repl_action_for_standby(ha, c, ep, peer_idx, - committed_tag, committed_lsn, + committed_tag, target_lsn, oldest_wal_lsn); } else if (rep_s.data_which == RequestReply_data_walackreplymsg) { /* Task 4.1: WAL ACK reply from standby — extract lsn + success, @@ -3750,8 +3823,8 @@ static void on_standby_connected(endpoint_t *ep) int rc = repl_add_standby(&c->persist.repl, ep, peer->hostname, (uint32_t)peer->port); if (rc >= 0) - TRACE("HA: repl registered late-joiner standby peer[%d] (slot %d)", - sctx->peer_idx, rc); + INFO("HA: repl registered late-joiner standby peer[%d] (slot %d, %s:%u)", + sctx->peer_idx, rc, peer->hostname, (uint32_t)peer->port); else WARN("HA: repl_add_standby late-joiner peer[%d] failed: %d", sctx->peer_idx, rc); diff --git a/src/controller/job.c b/src/controller/job.c index cccd6df..72d37b0 100644 --- a/src/controller/job.c +++ b/src/controller/job.c @@ -525,16 +525,12 @@ int handle_jobsubmit(cluster_t* c, endpoint_t* ep, xce_request_t* request) return -errno; } - reply.status = 0; - reply.data_which = RequestReply_data_jobid; - reply.data.jobid = jobid; - - xce_reply(ep, c->myhost, &reply); - + /* Build job list for the AFTER_EVENT hook BEFORE replying to client. + * The AFTER_EVENT hook writes WAL and waits for majority replication — + * the client must not be acknowledged until the job is durable. */ xlist_init(&jlist, submit->array_size); for (i = 0; i < submit->array_size; i++) { - /* Run hooks to tell scheduler */ lock(c->jobmgr, RTTI_LOCK_READ); rc = key_find(c->jobmgr, (void*)(jobid + i), (void**)&j); if (j != NULL) { @@ -554,13 +550,33 @@ int handle_jobsubmit(cluster_t* c, endpoint_t* ep, xce_request_t* request) } } - xce_run_hooks(&(c->hooksys), XCE_CONTROLLER_HOOK_JOB, HOOK_AFTER_EVENT, - HOOK_DETAIL_JOB_NEW, c, &jlist); + int hook_rc = xce_run_hooks(&(c->hooksys), XCE_CONTROLLER_HOOK_JOB, + HOOK_AFTER_EVENT, + HOOK_DETAIL_JOB_NEW, c, &jlist); xlist_iter(&jlist, (xlist_iter_fn_t)xlist_deref_job_item_, NULL); xlist_fini(&jlist); + /* If persistence failed (replication timeout, I/O error), reject the + * submission so the client knows the job was not made durable. */ + if (hook_rc != 0) { + WARN("handle_jobsubmit: persistence hook failed (rc=%d) — rejecting job", + hook_rc); + reply.status = hook_rc; + reply.data_which = RequestReply_data_nodata; + + xce_reply(ep, c->myhost, &reply); + return hook_rc; + } + + /* Reply only AFTER WAL write + majority replication succeeded. */ + reply.status = 0; + reply.data_which = RequestReply_data_jobid; + reply.data.jobid = jobid; + + xce_reply(ep, c->myhost, &reply); + return 0; } diff --git a/src/controller/persist.c b/src/controller/persist.c index a070e87..2e1f4e7 100644 --- a/src/controller/persist.c +++ b/src/controller/persist.c @@ -1038,7 +1038,14 @@ int persist_wal_sync_append(persist_t* p, uint32_t type, } if (sync_rc_out) *sync_rc_out = sync_err; - /* sync_err < 0 = degraded mode (local-only durability); continue operating. */ + /* sync_err < 0 — replication failed. + * -ENODEV: no standbys registered (single-node or degraded). + * -ETIMEDOUT: standbys were registered but didn't ACK in time. + * Only -ENODEV is acceptable for forward progress; timeout means + * the cluster had standbys but couldn't reach quorum — the write + * must be rejected to preserve the majority-consistency invariant. */ + if (sync_err == -ETIMEDOUT) + return -ETIMEDOUT; return 0; } diff --git a/src/controller/repl.c b/src/controller/repl.c index e0820fb..6a000a5 100644 --- a/src/controller/repl.c +++ b/src/controller/repl.c @@ -219,6 +219,14 @@ int repl_broadcast(replicator_t *r, const wal_entry_hdr_t *hdr, mylock_lock(&r->lock); + if (r->nstandbys == 0) { + WARN("repl_broadcast: no standbys registered — WAL entry lsn=%lu type=%u" + " not replicated", + (unsigned long)hdr->lsn, hdr->type); + mylock_unlock(&r->lock); + return 0; + } + for (int i = 0; i < MAX_STANDBYS; i++) { standby_conn_t *s = &r->standbys[i]; diff --git a/src/controller/testsuite/test_ha_connection_reuse.c b/src/controller/testsuite/test_ha_connection_reuse.c index 6509bd8..198d9a0 100644 --- a/src/controller/testsuite/test_ha_connection_reuse.c +++ b/src/controller/testsuite/test_ha_connection_reuse.c @@ -357,6 +357,8 @@ static void test_become_follower_closes_vote_endpoints(void) ha_phase2_hook = NULL; atomic_store_explicit(&ha.elect_ctx, NULL, memory_order_release); free_elect_ctx(ctx); + free(ep0); + free(ep1); ha_fini(&ha); printf("test_become_follower_closes_vote_endpoints: PASS\n"); } @@ -494,6 +496,8 @@ static void test_follower_passive_no_outbound_connect(void) ha_phase2_hook = NULL; atomic_store_explicit(&ha.elect_ctx, NULL, memory_order_release); free_elect_ctx(ctx); + free(ep0); + free(ep1); ha_fini(&ha); printf("test_follower_passive_no_outbound_connect: PASS\n"); } diff --git a/src/docs/FUTURE_WORK.md b/src/docs/FUTURE_WORK.md index 6632f1c..6083a70 100644 --- a/src/docs/FUTURE_WORK.md +++ b/src/docs/FUTURE_WORK.md @@ -1,108 +1,7 @@ # XCE Controller: Future Work Items -> **Status**: Tracked from config-replication-design.md review -> **Last Updated**: 2026-05-12 - ---- - -## 1. Admin Config Tool (prerequisite for Phase 2) - -`OP_upgradeConfig` requires an admin tool to drive it. The tool must: - -- Encode a `ClusterConfig` YAML/JSON file to Cap'n Proto binary -- Compute SHA-256 over the binary bytes -- Connect to the primary controller's endpoint (SSL, same CA as controllers) -- Send `OP_upgradeConfig` with the binary blob and SHA-256 -- Display the reply: new version tag, acked count, and any error message -- Poll `OP_probe` after restart to confirm the primary is back online with the new config - -Suggested interface: `xce-config push --controller --config cluster.yaml` - ---- - -## 2. Quorum-ACK Gate Before Restart (§14.4 extension) - -Current `OP_upgradeConfig` restarts the primary after best-effort push to standbys. -A quorum-ACK gate would refuse to restart unless a minimum number of standbys -acknowledge the push, preventing silent rollback when all standbys are offline. - -Requires: `OP_upgradeConfig` reply to include `--require-standby-ack=N` flag. - ---- - -## 3. OP_heartbeat Peers Cross-Validation (§11.2) - -Include a hash of the local `--peers` string in the heartbeat request. If two -candidates disagree on the peers list, log ERROR. Detects misconfigured nodes -at election time rather than silently producing dual-primary split-brain. - ---- - -## 4. Lost and Found Drain Command (§6.5 extension) - -`xcecli lost-and-found drain` — reassign or cancel sidelined jobs, reset -`lost_and_found_job_count` to 0. Automates operator cleanup after config upgrade. - ---- - -## 5. OP_upgradeConfig Standby Redirect (§10.12 verification) - -Test that a standby correctly returns an error reply with the primary's address -when an admin tool sends `OP_upgradeConfig` to a standby, and the admin tool -retries against the primary. - ---- - -## 6. validate_host() Implementation Plan - -`validate_host()` is currently a stub that returns success for all peers. Before -`CONF_ENABLE_UPGRADE_CONFIG` can be set to 1, it MUST be enhanced with a real -authorisation check. Minimum viable implementation: - -- Verify the peer's X.509 certificate Common Name (CN) against a configured - allowlist of authorised admin hosts. -- Add `--admin-cn` CLI flag or `admin_cn_list` config field to specify allowed CNs. -- Reject `OP_upgradeConfig` requests from peers whose CN is not in the allowlist - with a clear error message. -- Log all rejected attempts at WARN level with peer CN and IP. - -Future extensions (not required for gate removal): IP allowlist, role-based -access, mutual-TLS with admin-specific CA. - ---- - -## 7. OP_replConfig Access Control Hardening - -`OP_replConfig` currently serves the full cluster config blob to any peer that -completes an SSL handshake with a CA-signed cert (trusted-LAN model, §5.3). -Enhancements to consider: - -- Verify the requesting peer is a known controller (listed in `--peers`) before - serving the config blob. -- Rate-limit `OP_replConfig` requests per peer to prevent repeated disk I/O on - the primary. -- Add a `minimum_role` check (e.g., only serve to `HostRole_controller` peers, - not arbitrary SSL clients). - ---- - -## 8. Lost-and-Found Internal Keyword Validation - -The name `"lost_and_found"` is an internal controller keyword for synthetic -queue and host entries created during WAL recovery (§6.5). The controller -rejects this name at both `load_primary_config()` and `OP_upgradeConfig` entry -points. - -**Config tool responsibility**: The admin config tool (Future Work §1) MUST -validate that user-authored config files do not use the reserved names -`"lost_and_found"` for any queue or host. The tool should emit a clear error -and refuse to encode the config blob. This provides defence-in-depth: the -controller enforces at runtime, and the tool prevents at authoring time. - -**Migration path for pre-existing clusters**: If a cluster already has a -user-defined queue or host named `"lost_and_found"` before upgrading to this -controller version, the operator must rename it in the cluster config YAML -before the upgrade. The admin config tool will validate this; if bypassing -the tool and hand-crafting a Cap'n Proto blob, the controller's -`load_primary_config()` will FATAL with a message identifying the reserved -name. See `config-replication-design.md` §6.5 and §7.1. \ No newline at end of file +> **Moved (2026-06-10)**: All items merged into the single consolidated future-work document at +> [`.kiro/steering/roadmap.md`](../../.kiro/steering/roadmap.md). +> +> Section mapping: §1+§8 → admin-config-tool (backlog); §2 → superseded by ha-consistency-invariants Req 5; +> §3, §4, §5, §6, §7 → Hardening / Direct-Implementation Items. diff --git a/src/docs/apiserver-backend-enhancement-plan.md b/src/docs/apiserver-backend-enhancement-plan.md deleted file mode 100644 index 43333be..0000000 --- a/src/docs/apiserver-backend-enhancement-plan.md +++ /dev/null @@ -1,1013 +0,0 @@ -# API Server Backend Enhancement Plan - -## Context - -The Go API server at `src/frontend/apiserver/` serves as the REST frontend for the XCE cluster management system. Currently it operates in a push-based model: the C controller sends updates (jobs, workers, queues, resources) and the API server stores them in-memory. Write/control operations (job submit, job control, queue control) are forwarded to the controller via CGO. - -Analysis of the C test tool (`src/controller/testsuite/test.c`) and the `client.h` API revealed several backend operations that the API server does not yet support. Based on user feedback: - -- **Push-based, not pull**: Resource values and job info come via push, not synchronous queries -- **Remove from scope**: Resource Value Update (worker concern), Job Info sync query, Run Tasks (worker concern), Set Pending Reason (scheduler concern) -- **Keep at low priority**: Job Dispatch (future `brun`-like feature), Shutdown (admin tool, separate) - -The remaining actionable items are: - -1. **Cluster Config push handling** (P0) — Without this, host configs and cluster settings from the controller are silently dropped; operators cannot see configured hosts via the API -2. **Host Control** (P0) — Without this, operators cannot open or close hosts through the API; current workaround requires direct controller access -3. **Resource Value push handling** (P1) — Without this, live resource values from workers never reach the API; /resources/distribution returns stale config-sourced data only -4. **Host Resource Requirement Select** (P1) — Without this, users cannot query which hosts match their job's resource requirements; they cannot understand why a job isn't running -5. **Heartbeat keep-alive** (P1) — Without this, the API server's controller connection silently drops after timeout; push subscriptions stop without any error indication - -### Design Principles - -- **In-memory, no persistence**: the API server does not persist state by design. On restart, all data rebuilds from controller pushes. This is intentional — the controller is the source of truth. -- **RegisterToBackend is synchronous**: the call blocks until the controller connection is established and the initial configuration push is received. Startup sequencing depends on this. -- **RBAC enforcement**: all new endpoints must be registered under the existing JWT + RBAC middleware chain in `routers.go`. Host control (`host:control`) is restricted to the `cluster_admin` role; host select (`host:view`) is available to all authenticated users who need to query why their jobs can't run. - ---- - -## P0-1: Handle Cluster Config Push - -### Problem -`handleConfigPush()` in `clib.go` only processes `clusterconfig` pushes for queues and resource definitions. The `ClusterConfig` struct also contains host configs, user groups, host groups, and cluster settings that are silently dropped. - -### Changes - -**`src/frontend/apiserver/backend/clib.go`** — Expand `handleConfigPush`: -- The existing `handleConfigPush` already has a nil guard at line 222: `if conf == nil { return 0 }`. All new host config and cluster settings code must be inserted **after** this guard — do not remove or reposition it. -- After processing queues and resources, add `cClusterConfHostConfigs()` in `convert.go` using `conf.nhconfigs` (count) and `conf.hconfigs` (array) — same `unsafe.Slice(conf.hconfigs, n)` pattern as `cClusterConfQueues`. Call it in `handleConfigPush` the same way queues are iterated. -- Convert `C.xce_hostconfig_t` to Go model via new `cHostConfigToModel()` in `convert.go` -- Call `gHandler.OnHostConfigUpdated()` for each host config -- Extract cluster-level settings (cluster name, heartbeat interval, etc.) and call `gHandler.OnClusterUpdated()` -- **User groups and host groups**: `ClusterConfig` also contains `ugroups` and `hgroups` (flagged as silently dropped in the Problem section). **Deferred from this phase**: the API server has no `/xce/v1/usergroups` or `/xce/v1/hostgroups` endpoints yet, and the models for these types don't exist. Adding group handling in this phase would require defining new models, new store entries, new handler methods, and new REST routes — that is a separate feature, not a prerequisite for host config and cluster settings. For now, `ugroups` and `hgroups` fields in `ClusterConfig` continue to be ignored (not silently — this plan explicitly acknowledges the omission). A follow-on task should add group handling before any feature that depends on group membership checks. - -**`src/frontend/apiserver/backend/convert_pure.go`** — Follow the established `rawWorkerData` / `rawWorkerToModel` pattern exactly: -- Add `rawHostConfigData` struct with only the C fields that map to `models.HostInfo`: `name` (→HostName), `hostmodel` (→HostModel), `hosttype` (→HostType), `mxj` (→MaxSlot). Do NOT add `resources` (`xce_config_t**` — no `HostInfo` field) or `thresholds` (no `HostInfo` field). `dispatchwindow` is deferred (→`DisptWindow: ""`; see dispatchwindow note below). -- Add `rawHostConfigToModel(r rawHostConfigData) *models.HostInfo` — pure Go conversion, no CGO, testable without a live build. **TDD prerequisite**: before implementing, add table-driven tests in `backend/convert_test.go` covering: zero-value integer fields (`MaxSlot=0`), empty strings for `name`/`hostmodel`/`hosttype`, and normal values. Follow the existing `TestRawJobToModel` / `TestRawWorkerToModel` patterns in that file. -- Add `rawClusterData` struct and `rawClusterToModel(r rawClusterData) *models.ClusterInfo` — pure Go conversion. **TDD prerequisite**: add tests in `convert_test.go` covering: zero values for `heartbeatInterval`/`vcpus`/`inactiveHeartbeatCount`, and normal values. -```go -func rawHostConfigToModel(r rawHostConfigData) *models.HostInfo { - return &models.HostInfo{ - HostName: r.name, - HostModel: r.hostmodel, - HostType: r.hosttype, - MaxSlot: r.mxj, - // DisptWindow: "" — deferred, see dispatchwindow note - } -} -``` - -**`src/frontend/apiserver/backend/convert.go`**: -- Add `cHostConfigToModel()` — CGO extraction layer (thin; just reads C fields, calls `rawHostConfigToModel`): -```go -func cHostConfigToModel(hc *C.xce_hostconfig_t) *models.HostInfo { - return rawHostConfigToModel(rawHostConfigData{ - name: C.GoString(hc.name), - hostmodel: C.GoString(hc.hostmodel), - hosttype: C.GoString(hc.hosttype), - mxj: int(hc.mxj), - }) -} -``` -- **`dispatchwindow` conversion**: `xce_hostconfig_t.dispatchwindow` is `xce_timewindow_config_t*` — a complex nested struct (`nsegs`, `segs[]` each with `open`/`close` time fields). No existing Go conversion utility exists, and `cWorkerToModel` also leaves `DisptWindow` empty. For this phase, **set `DisptWindow: ""`** (leave as empty string) and add this comment so the deferral is visible in code review: -```go -// TODO(dispatchwindow): xce_hostconfig_t.dispatchwindow is xce_timewindow_config_t* -// (nsegs int + segs[] with open/close time fields). Serializing it requires a Go -// mirror struct and json.Marshal. Deferred: no API endpoint currently consumes -// DisptWindow. Implement when /xce/v1/hosts returns dispatch window data. -DisptWindow: "", -``` -Implementing the full timewindow → JSON serialization is deferred — it requires building a Go mirror struct for `xce_timewindow_config_t` and calling `json.Marshal`. -- The ClusterConfig struct from `controller.capnp` line 636 includes: `clusterName`, `heartbeatInterval`, `inactiveHeartbeatCount`, `fetchJobInterval`, `netioTimeout`, `vcpus`, plus `resources`, `queues`, `ugroups`, `hgroups`, `hostConfigs`, `limits` -- **C struct field names differ from Cap'n Proto names.** CGO accesses the C struct `cluster_config_t` (from `clusterconfig.h`) directly — use snake_case field names: `conf.clustername`, `conf.heartbeat_interval`, `conf.inactive_heartbeat_count`, `conf.fetch_job_interval`, `conf.netio_timeout`, `conf.vcpus`. The Cap'n Proto names above are reference only; using them in Go code is a compile error. - -**`src/frontend/apiserver/backend/notification.go`** — Add to `NotificationHandler`: -- `OnClusterUpdated(cluster *models.ClusterInfo)` -- `OnHostConfigUpdated(host *models.HostInfo)` - -**`src/frontend/apiserver/backend/handler.go`** — Implement in `DefaultHandler`: -- `OnClusterUpdated`: **partial merge** — do NOT overwrite the entire entry. The config push only owns `HeartbeatInterval`, `Vcpus`, `InactiveHeartbeatCount` (and `ClusterName` as the key). Existing fields (`Version`, `Status`, `ControllerName`, `NumServers`, `Resources`, `HostTypes`, `HostModels`, `ClusterAdmins`) come from the startup built-in data load and must be preserved. Read the existing entry, update only config-owned fields, then write back: -```go -existing, ok := store.Clusters.Get(cluster.ClusterName) -if ok { - existing.HeartbeatInterval = cluster.HeartbeatInterval - existing.Vcpus = cluster.Vcpus - existing.InactiveHeartbeatCount = cluster.InactiveHeartbeatCount - store.Clusters.Put(cluster.ClusterName, existing) -} else { - store.Clusters.Put(cluster.ClusterName, *cluster) -} -``` -**ClusterInfo field ownership**: config-sourced fields (`HeartbeatInterval`, `Vcpus`, `InactiveHeartbeatCount`) are always overwritten by the push; built-in/sourced fields (`Version`, `Status`, `ControllerName`, `NumServers`, `Resources`, `HostTypes`, `HostModels`, `ClusterAdmins`) are always preserved from the existing entry. If no entry exists, the full ClusterInfo is inserted. When new fields are added to `ClusterInfo`, each must be classified as config-sourced or built-in/sourced — ambiguous fields default to preserved (do not overwrite existing data on a config push). -- `OnHostConfigUpdated`: **partial merge** — do NOT overwrite the entire entry. Read the existing entry, update only config-sourced fields (`HostModel`, `HostType`, `MaxSlot`=mxj, `DisptWindow`), then write back. Worker-sourced fields (`HostStatus`, `CPUFactor`, `MaxMem`, `MaxSwap`, `NumRun`, `NumSSusp`, etc.) must be preserved. If no entry exists, create with config fields only (worker fields remain zero). Overwriting the full entry on every config push would erase live worker data. `store.Hosts.Get()` returns `(models.HostInfo, bool)` — use the two-value form: -```go -existing, ok := store.Hosts.Get(host.HostName) -if ok { - existing.HostModel = host.HostModel - existing.HostType = host.HostType - existing.MaxSlot = host.MaxSlot - existing.DisptWindow = host.DisptWindow - store.Hosts.Put(host.HostName, existing) -} else { - store.Hosts.Put(host.HostName, *host) -} -``` - -**Partial merge semantics**: the config push is a full cluster snapshot (all currently configured hosts appear in each push). `OnHostConfigUpdated` is called once per host per push. Config-sourced fields (`HostModel`, `HostType`, `MaxSlot`, `DisptWindow`) are always overwritten with the push values; **worker-sourced fields** (`HostStatus`, `CPUFactor`, `MaxMem`, `MaxSwap`, `NumRun`, `NumSSusp`, `NumUSusp`, `NumRsv`, `NumLIM`, `NumLIMR`, `CPUTime`, `MaxCPUTime`) are always preserved from the existing store entry. This explicit field ownership list must be maintained when new fields are added to `HostInfo` — each new field must be classified as config-sourced or worker-sourced. If a field's source is ambiguous, preserve it (worker data is live and should never be overwritten by a config snapshot). This is always a field-level partial update — never a full entry replacement. **Host removal**: if a host disappears from a subsequent config push, no `OnHostConfigUpdated` call fires for it, so its entry remains in the store with stale config fields. Host deletion from the store is explicitly deferred — a future implementation will add a `LastConfigSeenAt time.Time` field to `HostInfo` (updated by `OnHostConfigUpdated`) and a `LastWorkerSeenAt time.Time` field (updated by `OnHostUpdated`). These timestamp fields enable future TTL-based cleanup without requiring a model change later. For now they default to `time.Time{}` (the zero value), which is clearly distinguishable from a real timestamp. - -**First-startup display**: after config push but before any worker check-in, host entries have zero-valued worker-sourced fields. `HostStateStr(0)` currently returns `"OK"` (at `models/hosts.go:32`), which would incorrectly show config-only hosts as healthy. Change `HostStateStr` so that `state == 0` (the zero value) maps to `"UNKNOWN"` instead of `"OK"`: `if state == 0 { return "UNKNOWN" }` before the existing flag checks. This correctly signals that the host status has not yet been reported by a worker. - -- `OnHostUpdated`: **partial merge** — the existing method in `handler.go:27` currently does `store.Hosts.Put(host.HostName, *host)` (full overwrite). This overwrites config-sourced fields (`HostModel`, `HostType`, `MaxSlot`, `DisptWindow`) with zero/empty values from the worker push, destroying data set by `OnHostConfigUpdated`. Fix: read the existing entry, update only worker-sourced fields, preserve config-sourced fields. **TDD prerequisite**: before implementing any partial-merge handler, write `backend/handler_test.go` with table-driven tests that (1) prove `OnHostUpdated` currently does a full overwrite (RED test for the new behavior), (2) verify `OnHostUpdated` partial merge preserves config fields, (3) verify `OnHostConfigUpdated` partial merge preserves worker fields, (4) verify `OnClusterUpdated` partial merge preserves built-in fields. Use `store.InitStores()` for store reset between test cases. -```go -func (h *DefaultHandler) OnHostUpdated(host *models.HostInfo) { - existing, ok := store.Hosts.Get(host.HostName) - if ok { - // Overwrite only worker-sourced fields; preserve config-sourced fields. - existing.HostStatus = host.HostStatus - existing.CPUFactor = host.CPUFactor - existing.MaxMem = host.MaxMem - existing.MaxSwap = host.MaxSwap - existing.NumRun = host.NumRun - existing.NumSSusp = host.NumSSusp - existing.NumUSusp = host.NumUSusp - existing.NumRsv = host.NumRsv - existing.NumLIM = host.NumLIM - existing.NumLIMR = host.NumLIMR - existing.CPUTime = host.CPUTime - existing.MaxCPUTime = host.MaxCPUTime - store.Hosts.Put(host.HostName, existing) - } else { - store.Hosts.Put(host.HostName, *host) - } -} -``` -This is the mirror image of `OnHostConfigUpdated`: the worker push updates its own fields and preserves config fields; the config push updates its own fields and preserves worker fields. Both paths are read-then-write. There is no concurrent push scenario for a single cluster: all pushes (config and worker updates) originate from one controller and are delivered via a single `go_push_handler` callback thread, so only one push is in-flight at a time. `store.Hosts.Put` is a thread-safe map write for safety against any read access from HTTP handlers. Future multi-cluster support will maintain a separate in-memory state copy per cluster — each cluster's pushes are isolated to their own store, so cross-cluster contention is not a concern. - -**`src/frontend/apiserver/models/`** — **Add** missing fields to the **existing** `ClusterInfo` struct. Do NOT replace the struct — the existing fields (`Version`, `Status`, `ControllerName`, `NumServers`, `Resources`, `HostTypes`, `HostModels`, `ClusterAdmins`) at `models/clusters.go:16-26` are seeded at startup by `store.LoadBuiltinData()` and must be preserved. Only the three new fields below are added. The C struct (`cluster_config_t`) exposes `heartbeat_interval` (int), `vcpus` (int), `inactive_heartbeat_count` (int), `fetch_job_interval` (int), and `netio_timeout` (int). At minimum, `HeartbeatInterval` and `Vcpus` are required by other units in this plan (P0-1's `OnClusterUpdated` wiring and P1-3's `StartHeartbeat`). Add: -```go -// In models/clusters.go — ADD these fields to the existing ClusterInfo struct. -// Do NOT replace the struct; existing fields (Version, Status, ControllerName, etc.) -// are seeded by store.LoadBuiltinData() and must be preserved. -type ClusterInfo struct { - ClusterName string `json:"cluster_name"` // existing - Version string `json:"version"` // existing - Status int `json:"status"` // existing - ControllerName string `json:"controller_name"` // existing - NumServers int `json:"num_servers"` // existing - Resources string `json:"resources"` // existing - HostTypes string `json:"host_types"` // existing - HostModels string `json:"host_models"` // existing - ClusterAdmins string `json:"cluster_admins"` // existing - HeartbeatInterval int `json:"heartbeat_interval"` // NEW — seconds; used by StartHeartbeat - Vcpus int `json:"vcpus"` // NEW - InactiveHeartbeatCount int `json:"inactive_heartbeat_count"` // NEW — controller connection timeout = HeartbeatInterval × InactiveHeartbeatCount - // FetchJobInterval and NetioTimeout are available but not currently consumed by any API endpoint; add if needed -} -``` -The raw conversion follows the same `rawClusterData` / `rawClusterToModel` pattern as `rawWorkerData`: -```go -// In convert_pure.go -type rawClusterData struct { - name string - heartbeatInterval int - vcpus int - inactiveHeartbeatCount int -} -func rawClusterToModel(r rawClusterData) *models.ClusterInfo { - return &models.ClusterInfo{ - ClusterName: r.name, - HeartbeatInterval: r.heartbeatInterval, - Vcpus: r.vcpus, - InactiveHeartbeatCount: r.inactiveHeartbeatCount, - } -} -``` -```go -// In convert.go — CGO extraction layer calling rawClusterToModel -func cClusterConfToClusterInfo(conf *C.cluster_config_t) *models.ClusterInfo { - return rawClusterToModel(rawClusterData{ - name: C.GoString(conf.clustername), - heartbeatInterval: int(conf.heartbeat_interval), - vcpus: int(conf.vcpus), - inactiveHeartbeatCount: int(conf.inactive_heartbeat_count), - }) -} -``` -Also add **`cClusterConfResources()`** and **`cResdefToModel()`** to `convert.go` (these are added in P0-1, not P1-1 — P1-1 does not reuse these functions): -- `cClusterConfResources(conf *C.cluster_config_t) []*models.ResourceInfo` — iterates `conf.nres` / `conf.resources` array using `unsafe.Slice` pattern, calls `cResdefToModel()` for each -- `cResdefToModel(r *C.xce_resdef_t) *models.ResourceInfo` — converts `xce_resdef_t` fields to `models.ResourceInfo`. **Named `cResdefToModel` (not `cResourceToModel`) to avoid collision with the existing `cResourceToModel(res *C.xce_resource_t) *models.ResourceDefinitionInfo` at `convert.go:96`**, which serves the same cluster config push path but converts a different C struct type (`xce_resource_t`, not `xce_resdef_t`) to a different Go model (`ResourceDefinitionInfo`, not `ResourceInfo`). -- `cClusterConfHostConfigs(conf *C.cluster_config_t) []models.HostInfo` — iterates `conf.nhconfigs` / `conf.hconfigs` array using `unsafe.Slice` pattern, calls `cHostConfigToModel()` for each: -```go -// cClusterConfHostConfigs extracts host config models from a cluster_config_t. -func cClusterConfHostConfigs(conf *C.cluster_config_t) []models.HostInfo { - n := int(conf.nhconfigs) - if n == 0 || conf.hconfigs == nil { - return nil - } - hps := unsafe.Slice(conf.hconfigs, n) - out := make([]models.HostInfo, 0, n) - for _, hp := range hps { - if hp != nil { - out = append(out, *cHostConfigToModel(hp)) - } - } - return out -} -``` - -These replace the existing placeholder comment in the Changes list. Without them, `handleConfigPush` has nowhere to store the resource definitions that arrive in the initial cluster config push. - ---- - -## P0-2: Host Control via Backend - -### Problem -`ControlHost()` in `backend/stub.go` returns a static error `"host control not yet supported via C library"`. The C side has `xce_hostctrl_t` (action + hostname) and `worker_ctrl()` in the controller, but: -1. `xcecli_hostctrl()` does NOT exist in `client.h` — no C client function for it -2. The Cap'n Proto Request schema has `OPCode hostcontrol @14` but **no corresponding body field** for host control requests - -This means we need to **add the C-side plumbing first** before the Go server can use it. - -### Changes - -**C Side (new):** - -**`src/include/client.h`** — Add: -```c -extern int xcecli_hostctrl(xcecli_ctx_t ctx, xce_hostctrl_t* ctrl); -``` - -**`src/lib/client.c`** — Implement `xcecli_hostctrl()` following the exact pattern of `xcecli_queuectrl()`: -``` -xcecli_hostctrl() (client.c) - → xce_hostctrl() (xceapi.c) - → xce_hostctrl_req() (request.c) // builds xce_request_t, calls xce_request() - → cbuf_get(&ctx->wbuf, &status) // blocks until controller sends reply -``` - -**`src/lib/client.c`** — mirror `xcecli_queuectrl()` exactly: -```c -int xcecli_hostctrl(xcecli_ctx_t c, xce_hostctrl_t* ctrlinfo) -{ - api_ctx_t* ctx = (api_ctx_t*)c; - int rc; - if ((ctx == NULL) || (ctrlinfo == NULL)) return -EINVAL; - rc = xce_hostctrl(&(ctx->ctx), ctrlinfo); - return rc; -} -``` - -**`src/lib/xceapi.c`** — Add `xce_hostctrl()` mirroring `xce_queuectrl()`: -```c -int xce_hostctrl(xce_ctx_t* ctx, xce_hostctrl_t* ctrl) -{ - int rc, status; - if (!ctx || ctx->state != XCE_CTX_RUN) return -EINVAL; - rc = xce_hostctrl_req(ctx->ep, ctrl); - if (rc < 0) return rc; - rc = cbuf_get(&(ctx->wbuf), &status); - if (rc < 0) return rc; - return status; -} -``` - -**`src/lib/request.c`** — Add `xce_hostctrl_req()` mirroring `xce_queuectrl_req()`: -```c -int xce_hostctrl_req(endpoint_t* ep, xce_hostctrl_t* ctrlinfo) -{ - xce_request_t request; - if (!ep || !ctrlinfo || !ctrlinfo->hostname || !*ctrlinfo->hostname) - return -EINVAL; - /* Reject unsupported actions before the round-trip. - * worker_ctrl() only handles HOST_OPEN and HOST_CLOSE; all other values - * (including HOST_DO_NONE=0, HOST_TAG, HOST_UNTAG) hit its default branch - * and return -1, so reject them here for a clearer error. */ - if (ctrlinfo->action != HOST_OPEN && ctrlinfo->action != HOST_CLOSE) - return -EINVAL; - request.opcode = OPCode_hostcontrol; - request.body_which = Request_body_hostctrlmsg; - request.body.hostctrlmsg = ctrlinfo; - return xce_request(ep, &request); -} -``` - -**`src/include/request.h`** — Add declaration: `extern int xce_hostctrl_req(endpoint_t*, xce_hostctrl_t*);` - -**`src/include/xceapi.h`** — Add declaration: `extern int xce_hostctrl(xce_ctx_t*, xce_hostctrl_t*);` - -**`src/schema/controller.capnp`** — Two additions: - -1. Add `HostControl` struct (after `QueueControl` ~line 516), mapping to `xce_hostctrl_t` (types.h:630-633): -```capnp -struct HostControl $C.mapname("xce_hostctrl_t") { - action @0: UInt32 $C.mapname("action"); - hostname @1: Text $C.mapname("hostname"); -} -``` - -2. Add `hostctrlmsg` to Request body union (after `queuectrlmsg @17`): -```capnp -hostctrlmsg @21: HostControl; -``` -(Use @21 — the next available field number after `clrpreasonmsg @20`. Note: Cap'n Proto field numbers in the Request body union and in the OPCode enum are **independent namespaces** — the OPCode enum also has a `@21` value for `clrpreason`, but that is a different struct/enum and there is no conflict.) - -After regenerating with `ninja -C build`, `controller.capnp.h` gains `Request_body_hostctrlmsg = 18` and the generated encode/decode functions for `HostControl`. (Do not hardcode the integer `18` in code — always use the generated symbolic constant `Request_body_hostctrlmsg`. Regenerate and check that the constant is present before committing.) - -**`src/include/typemap.h`** — Add `xce_hostctrl_t* hostctrlmsg;` to the `xce_request_t` body union (line ~196, after `queuectrlmsg`). This handwritten C struct must be kept in sync with `controller.capnp` manually — regenerating the capnp schema updates `struct Request` in `controller.capnp.h` but does NOT update `typemap.h`: -```c -xce_queuectrl_t* queuectrlmsg; -xce_hostctrl_t* hostctrlmsg; /* NEW — must match @21 in controller.capnp */ -xce_taskrun_t* runtaskmsg; -``` - -**Drift detection** (deferred): `typemap.h` and `controller.capnp` can silently diverge — new body union variants added to the capnp schema won't appear in `typemap.h` automatically. A CI step should count declared union arms in `typemap.h.body` and compare against `Request_body_*` constants in `controller.capnp.h`. A count mismatch means a field was added to one but not the other. Concretely: `grep -c 'msg;' typemap.h` vs `grep -c 'Request_body_' controller.capnp.h` should match after subtracting 1 for `Request_body_nodata`. This CI check is **deferred to a follow-on task** per project decision — for now, manual verification after regenerating the capnp schema is sufficient. - -**`src/lib/helper.c`** — Add `Request_body_hostctrlmsg` case to both switches (`xce_request_body()` and `xce_request_msg_name()`). Note: `OPCode_hostcontrol` already exists in the opcode name switch at `helper.c:132` — only the `Request_body_*` case is new: -```c -case Request_body_hostctrlmsg: - return req->body.hostctrlmsg; // in xce_request_body() -``` -Without this, `xce_request_body()` returns NULL for host control requests (breaks tracing/logging). - -**`src/controller/cluster.c`** — Add `OPCode_hostcontrol` case (after `OPCode_queuecontrol`): -```c -case OPCode_hostcontrol: - rc = do_hostcontrol_op(c, ep, &request); - break; -``` - -**`src/controller/worker.c`** — Add `do_hostcontrol_op()` mirroring `do_queuecontrol_op()` in `queue.c`. `worker_ctrl()` already exists at `worker.c:579` and is declared in `controller/include/cluster.h:30`: -```c -int do_hostcontrol_op(cluster_t* c, endpoint_t* ep, xce_request_t* request) -{ - int rc = 0; - xce_reply_t reply; - init_reply_by_req(&reply, request); - rc = worker_ctrl(c, request->body.hostctrlmsg); - reply.status = rc; - reply.data_which = RequestReply_data_nodata; - xce_reply(ep, c->myhost, &reply); - return rc; -} -``` - -Declare `do_hostcontrol_op` in `controller/include/cluster.h`. - -**Go Side:** - -**`src/frontend/apiserver/controllers/hosts.go`** — **Fix pre-existing data race**: `var allFlag bool` (line 22) is a package-level mutable variable shared across concurrent goroutines. Two concurrent `POST /hosts/control` requests can interleave: Request A sets `allFlag = false`, Request B sets `allFlag = true`, then A reads `true` and operates on all hosts instead of one. Eliminate the package-level variable. Return `allFlag` as a local `bool` from `preCheckHostControlRequest` and pass it as a parameter to `ControlHost`. The same fix applies to `queues.go` which has the identical pattern at lines 534-536 / 465. - -**`src/frontend/apiserver/router/routers.go`** — Register both new routes under the existing JWT + RBAC middleware chain. Assign RBAC actions: -- `POST /xce/v1/hosts/control` → RBAC action `host:control`. Permitted roles: `cluster_admin` role. Only `cluster_admin` can execute host open/close operations — this is a cluster-altering action that affects availability. -- `POST /xce/v1/hosts/select` → RBAC action `host:view`. Permitted roles: all authenticated users. Normal users need to query host resource information to understand why their jobs cannot run, so this must be accessible beyond just admins. The action name is `host:view` (not `host:select`) to match the existing route registration in `routers.go:111` which already uses `RequirePermission("host:view")`. - -Add both actions to `config/rbac.yaml` under the appropriate roles. The existing JWT authentication middleware applies to all `/xce/v1/` routes; no additional auth changes are needed beyond the RBAC entries. - -**`src/frontend/apiserver/backend/clib.go`** — **Replace** the existing `ControlHost()` stub body (lines 310–312) with the real implementation below. Do NOT add a second definition — the stub already exists and must be replaced in-place: -```go -func ControlHost(hostname string, action int) error { - // Only HOST_OPEN and HOST_CLOSE are handled by worker_ctrl() in the controller. - // HOST_TAG/HOST_UNTAG will return an error from the controller side. - cHostname := C.CString(hostname) - defer C.free(unsafe.Pointer(cHostname)) - ctrl := C.xce_hostctrl_t{ - action: C.int(action), - hostname: cHostname, - } - // Note: C.xce_hostctrl_t has no union fields so direct struct literal is safe. - rc := C.xcecli_hostctrl(gCtx.ctx, &ctrl) - if rc < 0 { - return fmt.Errorf("xcecli_hostctrl failed: %d", int(rc)) - } - return nil -} -``` - -Note on `OPCode_reply` routing: `xcecli_hostctrl()` blocks in `cbuf_get()` waiting for the controller reply. This is safe — confirmed by reading `xceapi.c`: every `xce_*` function calls the request function then immediately calls `cbuf_get(&ctx->wbuf, &status)`. The C network thread delivers `OPCode_reply` messages directly into `ctx->wbuf`; they never reach `go_push_handler`. No change needed to the Go dispatch switch. - -**Blocking CGO call risk**: `xcecli_hostctrl()` blocks the calling goroutine's OS thread for the duration of the `cbuf_get()` wait. Under normal operation the controller responds within milliseconds. However, if the controller is unresponsive, no timeout bounds the wait. The existing `queuectrl` call has the same characteristic and has operated in production without issue — the controller is on the same machine (UNIX domain socket), so network latency is zero and controller response time is bounded. If a timeout becomes necessary in the future, the fix is to wrap the CGO call in a goroutine with `context.WithTimeout` and return an error on deadline — but this is not needed for the initial implementation given the local-socket deployment model. - -**`src/frontend/apiserver/backend/stub.go`** — Four stub changes required for `//go:build !cgo` (xcecli) builds: -1. `ControlHost`: keep existing stub function; change body to return `errNoCGO` (do NOT remove it). -2. `StartHeartbeat`: add new stub — `func StartHeartbeat(ctx context.Context) {}` (no-op is correct; xcecli has no heartbeat). -3. `SetHeartbeatInterval`: add new stub — `func SetHeartbeatInterval(secs int) {}` (no-op; xcecli never calls this but the symbol must exist for link). -4. `EvalSelectForHost`: add new stub — `func EvalSelectForHost(expr string, host models.HostInfo, resourceVals map[string]float64) (bool, error) { return false, errNoCGO }`. -5. `Cleanup`: add new stub — `func Cleanup() {}`. `clib.go` defines `Cleanup()` at line 142; without a `!cgo` counterpart, any `xcecli` shutdown path that calls `backend.Cleanup()` (e.g., a defer in `main.go`) will fail at link time with "undefined: backend.Cleanup". - -Also add `"context"` to the `stub.go` import block — `context.Context` in `StartHeartbeat`'s signature requires the `context` package. The current stub file only imports `"apiserver/models"` and `"errors"`; without `"context"` the stub will not compile. - -Without stubs 2 and 3, `xcecli` (built with `CGO_ENABLED=0`) fails to link with undefined symbol errors. - ---- - -## P1-1: Handle Resource Value Push Notifications - -### Investigation: Resource Value Delivery Path - -There is **one active path** through which resource value updates reach the API server: - -> **Path A (dataset push) and Path C (OPCode_update) are NOT used for the apiserver.** -> -> - `Data_data_resources` resource definitions arrive via the cluster config push (`OPCode_push` / `configpushmsg`), handled by P0-1. The controller never sends `Data_data_resources` or `Data_data_resvals` as a separate `pushmsg` to the apiserver. -> - `OPCode_update` / `Update_data_resvals` is a **worker → controller** message (sent via `xce_update_resvals()` in xceapi.c, handled by `do_update_resvals()` in `opupd.c`). The controller converts it to an `OPCode_notify` message before forwarding to the apiserver via `apiserver_resource_hook_fun`. The apiserver never receives `OPCode_update` directly. - -#### Active Path — `OPCode_notify` / `Request_body_notifymsg` (NotifyData) - -`go_push_handler` does not yet handle `OPCode_notify` (distinct opcode from `OPCode_push`; must be added at the top-level switch, not inside `handlePush()`). -The body is `xce_notify_data_t` (retrieve via `xce_request_body(req)`, then cast). -Relevant case: -- `NotifyData_data_schedUpdateResvals` (event == 8): `data.sched_update_resvals` is `xce_resval_list_t*` (`typemap.h:140`), which is `{int count, xce_resval_t** vals}` (`typemap.h:100-103`) - -### Changes - -**`src/frontend/apiserver/backend/clib.go`**: - -1. Add `OPCode_notify` case at the **top-level opcode switch** in `go_push_handler()` (NOT inside `handlePush()`): - -Notify messages are sent with `OPCode_notify` (enum value 10), which is **distinct from** `OPCode_push` (value 6). Placing the handler inside `handlePush()` would make it dead code — `handlePush()` is only reached when `req.opcode == OPCode_push`. -```go -case C.OPCode_notify: - // Guard body_which before casting — xce_request_body() returns NULL for any - // body_which it doesn't recognise, and dereferencing a nil *xce_notify_data_t - // panics. Mirror the pattern used in handlePush(). - if req.body_which != C.Request_body_notifymsg { - return 0 - } - nd := (*C.xce_notify_data_t)(unsafe.Pointer(C.xce_request_body(req))) - if nd == nil { return 0 } // defensive: mirror handleConfigPush nil check - return handleNotifyData(nd) -``` - -2. Add `handleNotifyData()`: - -> **C struct naming note**: `xce_notify_data_t` uses `int event` as its union discriminant field — NOT `data_which` (which is the discriminant name used by `xce_configdata_t`, `xce_reply_t`, and others). When adding new `NotifyData` cases to `helper.c`, switch on `d->event`, not `d->data_which`. The Go code below is correct; this note is for C-side additions. - -```go -func handleNotifyData(nd *C.xce_notify_data_t) C.int { - if nd.event == C.NotifyData_data_schedUpdateResvals { - // xce_notify_data_ptr() returns nd->data.sched_update_resvals (the pointer - // stored in the union field), confirmed in helper.c. - // Origin: worker sends OPCode_update → controller's do_update_resvals fires - // XCE_CONTROLLER_HOOK_RESOURCE → apiserver_resource_hook_fun forwards via - // OPCode_notify / NotifyData_data_schedUpdateResvals. These are - // worker-measured values (despite the "sched_" prefix in the event name). - rvl := (*C.xce_resval_list_t)(C.xce_notify_data_ptr(nd)) - if rvl == nil { return 0 } - n := int(rvl.count) - if n == 0 || rvl.vals == nil { return 0 } - vals := unsafe.Slice(rvl.vals, n) - for _, vp := range vals { - if vp == nil { continue } - rd := cResvalToDistribution(vp) - if rd != nil { - gHandler.OnResourceLocationUpdated(rd) - } - } - } - return 0 -} -``` - -The call site above uses a helper `cResvalToDistribution(vp *C.xce_resval_t) *models.ResourceDistributionInfo` defined in `convert.go` (see below). - -**`src/frontend/apiserver/backend/convert.go`** — Add `cResvalToDistribution()`: -- `xce_val_t` (`types.h:25-36`) has discriminant field `int which` (NOT `int type`). The union members are: `ivalue32` (int32), `uvalue32` (uint32), `ivalue64` (int64), `uvalue64` (uint64), `svalue` (char*), **`fvalue`** (double), `bvalue` (int). Switch on `val.which` using the **`Value_u_*` constants** from `controller.capnp.h`. **Do NOT use the `XCE_VAL_*` macros** (`XCE_VAL_STRING=0`, `XCE_VAL_NUMERIC=1`, `XCE_VAL_BOOLEAN=2`) — they are an unrelated classification and their integer values do not correspond to the `which` field. **Do NOT combine `Value_u_ivalue32`/`Value_u_ivalue64` (or the u32/u64 pair) into a single case** — each needs its own typed helper since reading `ivalue64` when only `ivalue32` is set gives garbage upper 32 bits (confirmed by union layout in `types.h:28-31`). -- CGO cannot access the `xce_val_t` union directly; add these C helpers in the `clib.go` CGO preamble: -```c -static int xce_val_which(xce_val_t *v) { return v->which; } -static int32_t xce_val_i32(xce_val_t *v) { return v->u.ivalue32; } -static int64_t xce_val_i64(xce_val_t *v) { return v->u.ivalue64; } -static uint32_t xce_val_u32(xce_val_t *v) { return v->u.uvalue32; } -static uint64_t xce_val_u64(xce_val_t *v) { return v->u.uvalue64; } -static double xce_val_fval(xce_val_t *v) { return v->u.fvalue; } /* union field is named 'fvalue', not 'dvalue' — double-typed but float-named */ -static char* xce_val_str(xce_val_t *v) { return v->u.svalue; } -static int xce_val_bool(xce_val_t *v) { return v->u.bvalue; } -/* NOTE: Do NOT combine ivalue32/ivalue64 or uvalue32/uvalue64 into one case. - * xce_val_t is a C union — ivalue32 (4 bytes) and ivalue64 (8 bytes) occupy - * the same address. Reading ivalue64 when which==ivalue32 gives garbage upper - * 32 bits. Each accessor must match the exact which value. */ -``` -- Add `cResvalToDistribution()` in `convert.go`. Called from `handleNotifyData` — returns `nil` on invalid input (vp.val == nil), caller must check before passing to handler: -```go -// cResvalToDistribution converts a C xce_resval_t into a Go ResourceDistributionInfo. -// vp.val is *C.xce_val_t (a pointer field in xce_resval_t) — pass directly, no &. -func cResvalToDistribution(vp *C.xce_resval_t) *models.ResourceDistributionInfo { - rd := &models.ResourceDistributionInfo{ - ResourceName: C.GoString(vp.name), - Location: C.GoString(vp.host), - IsDynamic: true, - } - // Guard: vp.val is a pointer field in xce_resval_t; it may be NULL if the - // controller sends a resval with no value set. Dereferencing NULL in - // xce_val_which() would segfault in C. Log the error and skip this entry - // rather than returning partial data or crashing. - if vp.val == nil { - logger.Warn("resval with nil value, skipping", zap.String("resource", rd.ResourceName), zap.String("host", rd.Location)) - return nil - } - switch C.xce_val_which(vp.val) { - case C.Value_u_ivalue32: - rd.ValueType = int(models.NUMERIC) // models.NUMERIC=1; XCE_VAL_NUMERIC is a C macro, not a Go symbol - rd.NumericValue = float64(C.xce_val_i32(vp.val)) - case C.Value_u_ivalue64: - rd.ValueType = int(models.NUMERIC) - rd.NumericValue = float64(C.xce_val_i64(vp.val)) - case C.Value_u_uvalue32: - rd.ValueType = int(models.NUMERIC) - rd.NumericValue = float64(C.xce_val_u32(vp.val)) - case C.Value_u_uvalue64: - rd.ValueType = int(models.NUMERIC) - rd.NumericValue = float64(C.xce_val_u64(vp.val)) - case C.Value_u_fvalue: - rd.ValueType = int(models.NUMERIC) - rd.NumericValue = float64(C.xce_val_fval(vp.val)) - case C.Value_u_svalue: - rd.ValueType = int(models.STRING) // models.STRING=0; XCE_VAL_STRING is a C macro, not a Go symbol - rd.StringValue = C.GoString(C.xce_val_str(vp.val)) - case C.Value_u_bvalue: - // ResourceDistributionInfo has a dedicated BooleanValue bool field (models.BOOLEAN=2). - rd.ValueType = int(models.BOOLEAN) - rd.BooleanValue = C.xce_val_bool(vp.val) != 0 - default: - // Unknown union discriminant — log and skip rather than returning corrupted data. - // Future protocol versions may add new value types; this guard prevents silent - // zero-initialization of fields that would appear as empty strings or zeros. - logger.Warn("unknown xce_val_t discriminant, skipping", zap.Int("which", int(C.xce_val_which(vp.val))), zap.String("resource", rd.ResourceName), zap.String("host", rd.Location)) - return nil - } - return rd -} -``` - -**`cResdefToModel()` note** — P0-1 adds `cResdefToModel(r *C.xce_resdef_t) *models.ResourceInfo` (note: `resdef` not `resource`) to avoid colliding with the existing `cResourceToModel(res *C.xce_resource_t) *models.ResourceDefinitionInfo` at `convert.go:96`. These are different C structs (`xce_resdef_t` vs `xce_resource_t`) mapping to different Go models (`ResourceInfo` vs `ResourceDefinitionInfo`). P1-1 does NOT add either function — it reuses the existing `cResourceToModel` for the resource definition path and `cResvalToDistribution` for the resval push path. - -**`src/frontend/apiserver/backend/notification.go`** — No change needed. The existing `OnResourceLocationUpdated(res *models.ResourceDistributionInfo)` already writes to `store.ResourceLocations` keyed by `(resName, host)`. Reuse it via `cResvalToDistribution`. **Do NOT add** `OnResourceValUpdated` — that would create an interface split whose `interface{}` → `ResourceDistributionInfo` field-mapping is unspecified. - -**`src/frontend/apiserver/store/stores.go`** — The existing `ResourceLocations` store maps `(resName, host)` → `ResourceDistributionInfo`. Live values from push merge into that store via `OnResourceLocationUpdated`, which already performs this write. - ---- - -## P1-2: Host Resource Requirement Select (FilterHostByResReqSelect) - -### Problem -`FilterHostByResReqSelect()` in `controllers/hosts.go:376` returns empty results — it's a stub. This needs to evaluate resource requirement expressions against current host data. - -### Investigation: Existing PEG Infrastructure - -The codebase already has three PEG grammar files compiled via packcc into C parsers: - -| File | Prefix | What it parses | -|------|--------|----------------| -| `lib/section.peg` | `xce_section` | Full resource section: `select[…] rusage[…] span[…] same[…] affinity[…]` | -| `lib/rusage.peg` | `xce_rusage` | The rusage clause: `res=value[:duration=N][:decay=0/1], …` | -| `lib/xce_resreq.peg` | `xce_resreq` | Compound/alternate resource spec: `{primary} + {primary}` | - -`section.peg` extracts the `select[…]` content into `xce_resreq_data_t.selectString` (a raw string). However, `xce_resreq_select_` is currently **an empty struct** (`resreq.h:67`). The select string is stored but never parsed further. - -**The select expression** (e.g. `"type == any && mem > 100"`) is a boolean filter expression over host attributes and dynamic resource values. It is used by both the API server (`/xce/v1/hosts/select`) and the scheduler (host selection for job dispatch) — so the parser belongs in `lib/resreq.c` where all the other parsers live. - -### Design: New `xce_select.peg` Grammar - -Add `lib/xce_select.peg` with prefix `xce_select`. The grammar parses a boolean expression tree: - -```peg -%prefix "xce_select" -%auxil "select_context_t *" -%common { #include "resreq.h" ... } - -statement <- _ expr _ EOF - -expr <- or_expr - -or_expr <- left:and_expr (_ "||" _ right:and_expr)* { /* build OR node */ } - -and_expr <- left:cmp_expr (_ "&&" _ right:cmp_expr)* { /* build AND node */ } - -cmp_expr <- '(' _ expr _ ')' - / attr:identifier _ op:cmp_op _ val:cmp_value - { /* build COMPARE node: attr, op, val */ } - -cmp_op <- ">=" / "<=" / "!=" / "==" / ">" / "<" - { auxil->op = parse_cmp_op($0); } - -cmp_value <- number { auxil->val_type = SEL_VAL_NUM; auxil->val_num = atof($0); } - / "any" { auxil->val_type = SEL_VAL_ANY; } - / identifier { auxil->val_type = SEL_VAL_STR; auxil->val_str = strdup($0); } - -identifier <- [a-zA-Z_][a-zA-Z_0-9]* { auxil->attr = strdup($0); } -number <- [0-9]+('.'[0-9]*)? { auxil->tmp_num = atof($0); } -_ <- [ \t]* -EOF <- !. -``` - -### Data Structures and Declarations (in `resreq.h`) - -Replace the empty `xce_resreq_select_` with a proper expression tree, and add `extern` declarations for the three new functions (required so CGO can call them when `#include "resreq.h"` is in `clib.go`'s preamble): - -```c -/* Add alongside existing extern declarations in resreq.h */ -extern int parse_select(xce_select_t** sel, char* expr, char** errmsg); -extern int eval_select(xce_select_t* sel, - double (*get_attr)(char*, uintptr_t), uintptr_t ctx); -extern void free_select(xce_select_t* sel); -``` - -```c -typedef enum { - XCE_SEL_AND = 0, - XCE_SEL_OR, - XCE_SEL_CMP, -} xce_sel_op_t; - -typedef enum { - XCE_SEL_VAL_NUM = 0, - XCE_SEL_VAL_STR, - XCE_SEL_VAL_ANY, /* "any" keyword — matches any value */ -} xce_sel_val_type_t; - -typedef enum { - XCE_SEL_EQ = 0, XCE_SEL_NE, - XCE_SEL_GT, XCE_SEL_GE, - XCE_SEL_LT, XCE_SEL_LE, -} xce_sel_cmp_t; - -typedef struct xce_sel_node_ xce_sel_node_t; - -struct xce_sel_node_ { - xce_sel_op_t op; - union { - struct { xce_sel_node_t* left; xce_sel_node_t* right; } logical; - struct { - char* attr; /* e.g. "type", "mem", "r1m" */ - xce_sel_cmp_t cmp; - xce_sel_val_type_t val_type; - union { double num; char* str; } val; - } cmp; - } u; -}; - -struct xce_resreq_select_ { - xce_sel_node_t* root; -}; -``` - -### C API in `lib/resreq.c` - -Add three functions: - -```c -/* Parse a select expression string into *sel. Returns 0 on success. - * Note: expr is char* (not const) to match the existing parse_* pattern in - * resreq.c where context structs store a char* input field — passing const - * would require a const-discard cast and produce -Werror warnings. */ -int parse_select(xce_select_t** sel, char* expr, char** errmsg); - -/* Evaluate *sel against a host attribute lookup function. - * get_attr(name, ctx) returns the attribute value (float) or NAN if unknown. - * Returns 1 if host matches, 0 if not. */ -int eval_select(xce_select_t* sel, - double (*get_attr)(char*, uintptr_t), uintptr_t ctx); - -void free_select(xce_select_t* sel); -``` - -The `get_attr` callback is intentionally generic — it can be backed by: -- A `xce_worker_t*` for scheduler use (pure C, no CGO needed) -- A flat attribute table for the Go API server path (see Go integration below) - -### Note on N-ary Operators - -**The grammar rules in the Design section above must be rewritten** — the `*` (zero-or-more) quantifier form shown there is not directly supported with accumulator state in packcc action bodies. The `while (next_right)` pseudo-code is conceptual; packcc does not expose loop state across repetitions in a user action. - -**Correct packcc approach — right-recursive alternation:** - -```peg -or_expr <- l:and_expr _ "||" _ r:or_expr - { $$ = build_logical_node(XCE_SEL_OR, l, r); } - / and_expr - -and_expr <- l:cmp_expr _ "&&" _ r:and_expr - { $$ = build_logical_node(XCE_SEL_AND, l, r); } - / cmp_expr -``` - -PEG parsers cannot handle left-recursive rules (they would loop infinitely), so left-associativity via the `*` pattern requires explicit accumulation in the grammar's semantic actions. Right-recursive alternation (as above) is the standard packcc solution. The resulting tree is right-associative (`a || b || c` → `or(a, or(b, c))`), which is semantically equivalent for boolean operators. If left-associativity is required for evaluation order, use an auxiliary list accumulated in `auxil` during parsing: - -```c -/* In auxil struct: */ -struct { xce_sel_node_t** items; int count; int cap; } pending_or; - -/* or_tail rule collects each right-hand operand: */ -or_tail <- _ "||" _ r:and_expr { append_to_pending(auxil, r); } -or_expr <- head:and_expr or_tail* { - /* build left-associative chain from head + pending list */ - $$ = build_left_chain(XCE_SEL_OR, head, auxil->pending_or); - clear_pending(auxil); -} -``` - -The right-recursive approach is simpler and sufficient — use it unless left-associativity is explicitly required by the select expression spec. - -Also update **`kill_primary_resreq()`** in `resreq.c` to call `free_select(resreq->select)` before `xlist_fini`. This is the correct location — `kill_primary_resreq()` (resreq.c:236) owns the `xce_primary_resreq_t` and frees its members; `kill_resreq_data()` only frees string fields and `kill_resreq()` delegates to it. Adding `free_select()` to either of those would be in the wrong function. Without this fix, every parsed select expression leaks its AST. - -**NULL safety and struct freeing at the call site are both mandatory.** - -`xce_primary_resreq_t.select` is NULL for every resreq that has no select[] clause (virtually all existing job resource requirements). The codebase convention (confirmed in `kill_compound_resreq`: `kill_primary_resreq(primary); FREEUP(primary);`) is: kill_ functions free the interior, the **caller** frees the container. `free_select` must follow the same convention — free the node tree only, not `sel` itself. Therefore `kill_primary_resreq` must both call `free_select` AND free the struct: - -```c -if (resreq->select) { - free_select(resreq->select); /* frees node tree (interior) */ - FREEUP(resreq->select); /* frees xce_select_t struct (container) */ -} -``` - -**Do NOT use `resreq->select = NULL` without `FREEUP`** — the `= NULL` assignment does not call `free()` and the 8-byte `xce_select_t` struct leaks. Without the `if` guard, calling `free_select(NULL)` on any existing job (whose `select` is NULL) will crash; `free_select` should start with `if (!sel) return;` but the guard at the call site is also required per the codebase defensive pattern. - -### Go Integration - -**`src/frontend/apiserver/backend/clib.go`** — Export `EvalSelectForHost()`: - -Three additions to `clib.go` are required before the code will compile: -1. Add `#include "resreq.h"` to the CGO preamble block (alongside `client.h`, `netio.h`, etc.) — without it `xce_select_t`, `parse_select`, `eval_select`, and `free_select` are all undeclared. -2. Add `extern` declaration for the Go-exported callback plus a destroy helper in the CGO preamble (same pattern as `go_push_handler`). Without the extern, `C.xce_select_get_attr` is undefined: -```c -extern double xce_select_get_attr(char* name, uintptr_t ctx); -/* xce_select_destroy: free tree nodes then the struct in one call. - * free_select() frees only the interior (node tree); parse_select() - * malloc'd the xce_select_t struct, so the caller must free it too. - * A single C helper avoids Go defer LIFO ordering issues (free before - * free_select would be use-after-free). */ -static void xce_select_destroy(xce_select_t* sel) { - if (sel) { free_select(sel); free(sel); } -} -``` -3. Add `"runtime/cgo"` and `"math"` to the Go import block — `runtime/cgo` for `cgo.NewHandle`/`h.Delete()`, `math` for `math.NaN()` (the NaN return value from the callback; `C.NAN` is a macro and cannot be called from CGO). - -The `void* ctx` parameter of `eval_select` carries per-call state. Go maps cannot be passed as `void*` (they contain GC-managed pointers, violating CGO pointer rules). Use a **`cgo.Handle`** instead: - -```go -// hostSelectCtx holds per-evaluation attribute data accessible from the C callback. -type hostSelectCtx struct { - host models.HostInfo - resourceVals map[string]float64 -} - -//export xce_select_get_attr -func xce_select_get_attr(name *C.char, ctx C.uintptr_t) C.double { - h := cgo.Handle(ctx) // C.uintptr_t is an integer, not a pointer — no go vet warning - sc := h.Value().(*hostSelectCtx) - attrName := C.GoString(name) - // look up attrName in sc.host fields and sc.resourceVals - // return NaN if unknown: use C.double(math.NaN()) — NAN is a C macro, - // not a callable function, so C.NAN / C.math_nan() do not compile in CGO. - // Requires adding "math" to Go imports in clib.go. - ... -} - -func EvalSelectForHost(expr string, host models.HostInfo, resourceVals map[string]float64) (bool, error) { - cExpr := C.CString(expr) - defer C.free(unsafe.Pointer(cExpr)) - - var sel *C.xce_select_t - var errmsg *C.char - if rc := C.parse_select(&sel, cExpr, &errmsg); rc < 0 { - // Guard against NULL errmsg: parse_select may return an error - // (e.g. -EINVAL for a NULL/empty input) without allocating an error - // message. C.GoString(nil) has undefined behaviour in CGO. - var msg string - if errmsg != nil { - msg = C.GoString(errmsg) - C.free(unsafe.Pointer(errmsg)) - } else { - msg = "unknown parse error" - } - return false, fmt.Errorf("parse_select: %s", msg) - } - defer C.xce_select_destroy(sel) // frees tree nodes then the struct itself - - // Register Go context with a handle — safe to pass uintptr into C - sc := &hostSelectCtx{host: host, resourceVals: resourceVals} - h := cgo.NewHandle(sc) - defer h.Delete() - - result := C.eval_select(sel, - (*[0]byte)(C.xce_select_get_attr), // //export function pointer - C.uintptr_t(h)) // cgo.Handle is a uintptr — integer cast, no unsafe.Pointer needed; avoids go vet "unsafe.Pointer(uintptr(...))" warning - return result != 0, nil -} -``` - -**`src/frontend/apiserver/controllers/hosts.go`** — `FilterHostByResReqSelect`: -- Iterate `store.Hosts` -- For each host, collect live resource vals from `store.ResourceLocations` -- Call `backend.EvalSelectForHost(selectExpr, host, resourceVals)` -- Include host in result if it returns `true` - -**Performance**: this path is O(H × R) per request where H = number of hosts and R = number of resource types per host. For each host, collecting resource vals from `store.ResourceLocations` requires one map lookup per resource type that might appear in the expression. For clusters with hundreds of hosts and dozens of resource types, a single `/select` call may involve thousands of CGO round-trips (one `eval_select` call per host). **Acceptable for now**: `/xce/v1/hosts/select` is a user-facing query endpoint, not a hot scheduling path. If profiling shows this is a bottleneck, the optimization is to parse the select expression once (call `parse_select` before the host loop, pass the `xce_select_t*` directly) — `EvalSelectForHost` currently parses on every call. A future `EvalSelectForHostParsed(sel *C.xce_select_t, ...)` variant would amortize parsing cost. Do not over-engineer this in the initial implementation. - -**Input safety**: the select expression is user-supplied input passed through a CGO boundary to a C PEG parser. The following safety measures are required: -1. **Expression length limit**: cap the select expression string to 1024 bytes at the Go handler level before passing to `parse_select`. Select expressions in job submissions are short by nature (e.g., `type == LINUX64 && r1m > 1.5`); 1024 bytes is generous and prevents allocating unbounded C buffers. Reject with HTTP 400 if the limit is exceeded. **Update `preCheckHostRequest()` in `controllers/hosts.go`** to change the existing 4094-character limit to 1024 bytes — the old limit was set before CGO-based evaluation was designed and is too permissive for the PEG parser. -2. **CGO crash containment**: `recover()` in Go only catches Go panics. A C SIGSEGV (null pointer dereference in `parse_select`/`eval_select`) terminates the process immediately — Go defers and `recover()` are bypassed. The PEG parser must be hardened with internal null/bounds checks in C. Add a comment in the handler: `// Note: recover() does NOT catch C SIGSEGV. C-level null dereference in parse_select/eval_select terminates the process. Rely on C-level validation, not Go recovery.` For defense-in-depth, still wrap `EvalSelectForHost` in `defer func() { if r := recover(); r != nil { ... } }()` — this catches Go-level panics (e.g., nil interface dereference in the Go callback) but cannot prevent C-level crashes. Additionally, C-level hardening is required: `parse_select` must validate input before parsing (empty string, NULL pointer, length check) and `eval_select` must null-check `sel != NULL` before traversing the tree. -3. **Hostname sanitization**: the `host_name` field in `/xce/v1/hosts/control` requests must be validated against RFC 952/1123 hostname rules (alphanumeric, hyphens, dots; max 253 chars) before passing to CGO. The list-length cap for the `host_name` array is 256 entries per request. - -### Build Integration - -`src/lib/meson.build` lists `.peg` sources **explicitly** (confirmed: `section.peg`, `rusage.peg`, `xce_resreq.peg` are each listed individually — no glob). Add `xce_select.peg` to that explicit list. - -### Scope Note - -This parser lives in `libxce` (not in the Go layer). **Rationale**: the `select[]` expression is parsed by the existing `xce_section.peg` infrastructure in `lib/resreq.c` — the select string is already extracted there into `xce_resreq_data_t.selectString`. Placing `parse_select` + `eval_select` in the same library keeps the data flow coherent (parse → the same struct that holds the raw string) and allows a future scheduler path to call `eval_select` directly against `xce_worker_t*` attributes without going through CGO on the hot scheduling path. - -**Scheduler integration is explicitly deferred**: this plan does not add scheduler calls to `eval_select`. The C API is designed to be scheduler-compatible (the `get_attr` callback abstraction allows any attribute source), but wiring it into the scheduler's host selection loop is a separate task. If the decision is made to keep `select` evaluation in the Go layer only (e.g., because scheduler rewrite is planned), `parse_select`/`eval_select` can be moved to a Go PEG implementation at that point without breaking the API server path. The C placement is a forward-compatible choice, not a commitment to the scheduler design. - -**Grammar validation requirement**: before finalizing `xce_select.peg`, validate it against a corpus of real select expressions from existing job submissions and documentation examples. The grammar above is derived from the documented select syntax but has not been tested against production workloads. Known expression forms to cover: `type == any`, `type == LINUX64`, `mem > 100`, `r1m < 1.5 && ncpus >= 2`, `(mem > 256 || swap > 512) && type != WINDOWS`. Without this validation, the grammar may fail on valid expressions that users already rely on. - ---- - -## P1-3: Heartbeat Keep-Alive - -### Problem -The API server joins the controller as `HostRole_apiserver` but never sends heartbeat keep-alives. If the controller times out the connection, the API server loses its push subscription silently. - -### Changes - -**`src/frontend/apiserver/backend/clib.go`** — Add `"sync/atomic"`, `"context"`, and `"time"` to the Go import block. Add a package-level interval store and `StartHeartbeat()`: - -```go -// heartbeatIntervalSecs is the current heartbeat interval in whole seconds. -// Initialised to 30; updated atomically by SetHeartbeatInterval when -// OnClusterUpdated fires with the controller-supplied value. -var heartbeatIntervalSecs int32 = 30 - -// heartbeatFn is the variable holding the heartbeat C call, injectable for testing. -// In production it wraps C.xcecli_heartbeat; tests replace it with a counting stub. -var heartbeatFn func(secs int) int = func(secs int) int { - return int(C.xcecli_heartbeat(gCtx.ctx, C.int(secs))) -} - -// SetHeartbeatInterval stores a new heartbeat interval (in seconds). -// Called from OnClusterUpdated in handler.go when a cluster config push arrives. -// The running StartHeartbeat goroutine reads this value on each tick so it picks -// up the controller-specified interval without a restart. -// Range: clamped to [1, 3600] (1 second minimum to prevent spin; 3600 seconds = 1 hour max). -func SetHeartbeatInterval(secs int) { - if secs < 1 { - secs = 1 - } - if secs > 3600 { - secs = 3600 - } - atomic.StoreInt32(&heartbeatIntervalSecs, int32(secs)) -} - -func StartHeartbeat(ctx context.Context) { - go func() { - // Read the current interval at first tick; re-read on every tick so - // an OnClusterUpdated call mid-flight takes effect without a restart. - secs := int(atomic.LoadInt32(&heartbeatIntervalSecs)) - if secs < 1 { secs = 1 } - ticker := time.NewTicker(time.Duration(secs) * time.Second) - defer ticker.Stop() - for { - select { - case <-ctx.Done(): - return // clean shutdown — no goroutine leak on server exit - case <-ticker.C: - newSecs := int(atomic.LoadInt32(&heartbeatIntervalSecs)) - if newSecs >= 1 && newSecs != secs { - secs = newSecs - ticker.Reset(time.Duration(secs) * time.Second) - } - rc := heartbeatFn(secs) - if rc < 0 { - logger.Warn("Heartbeat failed", zap.Int("rc", int(rc))) - // Single failure is logged but not escalated. Connection - // recovery is handled by the push subscription layer. - } - } - } - }() -} -``` - -Note: `xce_heartbeat()` in `xceapi.c` already suppresses sends when recent traffic exists (`now - ts_last_out < hb_interval`), so the goroutine is a safe periodic trigger, not a rate-multiplier. - -**`src/frontend/apiserver/backend/handler.go`** — In `OnClusterUpdated`, call `SetHeartbeatInterval` after partial-merging to the cluster store: -```go -func (h *DefaultHandler) OnClusterUpdated(cluster *models.ClusterInfo) { - // Partial merge: preserve existing built-in/sourced fields, overwrite only config-sourced fields. - existing, ok := store.Clusters.Get(cluster.ClusterName) - if ok { - existing.HeartbeatInterval = cluster.HeartbeatInterval - existing.Vcpus = cluster.Vcpus - existing.InactiveHeartbeatCount = cluster.InactiveHeartbeatCount - store.Clusters.Put(cluster.ClusterName, existing) - } else { - store.Clusters.Put(cluster.ClusterName, *cluster) - } - if cluster.HeartbeatInterval > 0 { - SetHeartbeatInterval(cluster.HeartbeatInterval) // wire interval from config push into heartbeat goroutine - } -} -``` - -**`src/frontend/apiserver/cmd/main.go`** — Call `backend.StartHeartbeat(ctx)` after `backend.RegisterToBackend()`, passing the server's root context so the goroutine exits when the server shuts down. `RegisterToBackend` is a synchronous operation — it blocks until the controller connection is established and the initial configuration push is received. This means the first `OnClusterUpdated` call (which sets `heartbeatIntervalSecs` via `SetHeartbeatInterval`) fires **before** `StartHeartbeat` is called. The heartbeat therefore starts with the correct interval from the controller, not the 30s default: -```go -ctx, cancel := context.WithCancel(context.Background()) -defer cancel() -// ... -backend.RegisterToBackend(...) // synchronous: blocks until connected + first config push received -backend.StartHeartbeat(ctx) // interval already set by OnClusterUpdated from config push -// The 30s default is only used if StartHeartbeat is called before the first -// config push arrives; in normal startup this does not happen because -// RegisterToBackend is synchronous. -``` - ---- - -## Files to Modify - -| Priority | File | Change | -|----------|------|--------| -| P0-1 | `backend/clib.go` | Expand `handleConfigPush` for host configs + cluster settings; call `cClusterConfToClusterInfo()` then `gHandler.OnClusterUpdated()` | -| P0-1 | `backend/convert.go` | Add `cHostConfigToModel()`, `cClusterConfHostConfigs()` (iterates `conf.nhconfigs`/`conf.hconfigs` via `unsafe.Slice` — guards both `n == 0` and `conf.hconfigs == nil`), `cClusterConfToClusterInfo()`, `cClusterConfResources()`, `cResdefToModel()` (named to avoid collision with existing `cResourceToModel`) | -| P0-1 | `backend/convert_pure.go` | Add `rawHostConfigData`+`rawHostConfigToModel()` and `rawClusterData`+`rawClusterToModel()` | -| P0-1 | `backend/notification.go` | Add `OnClusterUpdated`, `OnHostConfigUpdated` | -| P0-1 | `backend/handler.go` | Implement `OnClusterUpdated` (partial merge: overwrite only config-sourced fields + calls `SetHeartbeatInterval`), `OnHostConfigUpdated` (partial merge), `OnHostUpdated` (partial merge: overwrite only worker-sourced fields, preserve config-sourced fields) | -| P0-1 | `models/` | Add `HeartbeatInterval`, `Vcpus`, `InactiveHeartbeatCount` fields to `ClusterInfo` | -| P0-1 | `models/hosts.go` | Change `HostStateStr(0)` from returning `"OK"` to returning `"UNKNOWN"` — a host that has not yet reported its status via worker push should not appear healthy | -| P0-2 | `schema/controller.capnp` | Add `HostControl` struct + `hostctrlmsg @21` to Request body union | -| P0-2 | `include/typemap.h` | Add `xce_hostctrl_t* hostctrlmsg;` to `xce_request_t.body` union (handwritten — not auto-generated) | -| P0-2 | `include/client.h` | Add `xcecli_hostctrl()` declaration | -| P0-2 | `include/xceapi.h` | Add `xce_hostctrl()` declaration | -| P0-2 | `include/request.h` | Add `xce_hostctrl_req()` declaration | -| P0-2 | `lib/client.c` | Implement `xcecli_hostctrl()` | -| P0-2 | `lib/xceapi.c` | Implement `xce_hostctrl()` with `cbuf_get()` wait | -| P0-2 | `lib/request.c` | Implement `xce_hostctrl_req()` | -| P0-2 | `lib/helper.c` | Add `Request_body_hostctrlmsg` case to `xce_request_body()` + `xce_request_msg_name()` | -| P0-2 | `controller/cluster.c` | Add `OPCode_hostcontrol` case → `do_hostcontrol_op()` | -| P0-2 | `controller/worker.c` | Add `do_hostcontrol_op()` calling `worker_ctrl()` | -| P0-2 | `controller/include/cluster.h` | Declare `do_hostcontrol_op()` | -| P0-2 | `backend/clib.go` | Implement real `ControlHost()` via `xcecli_hostctrl()` | -| P0-2 | `controllers/hosts.go` | **Fix pre-existing data race**: eliminate package-level `var allFlag bool` (line 22); return `allFlag` as a local `bool` from `preCheckHostControlRequest` and pass as parameter to `ControlHost`. Same fix in `controllers/queues.go` lines 534-536 / 465. | -| P0-2 | `backend/stub.go` | Keep `ControlHost` stub; change body to `errNoCGO`. Add stubs: `StartHeartbeat(ctx context.Context) {}`, `SetHeartbeatInterval(secs int) {}`, `EvalSelectForHost(...) (bool, error)` returning `errNoCGO`, `Cleanup() {}`. Add `"context"` to import block (for `context.Context` in `StartHeartbeat`). | -| P0-2 | `router/routers.go` | Register `POST /xce/v1/hosts/control` under JWT + RBAC middleware with action `host:control` (`cluster_admin` role), and `POST /xce/v1/hosts/select` under JWT + RBAC middleware with action `host:view` (all authenticated users). Both routes already exist at lines 111-112 — this row confirms their RBAC actions are correct. Both routes inherit the existing RateLimit middleware. | -| P0-2 | `config/rbac.yaml` | Add `host:control` and `host:view` action entries with role assignments | -| P1-1 | `backend/clib.go` | Add CGO val helpers (`xce_val_which`, `xce_val_i32`, `xce_val_i64`, `xce_val_u32`, `xce_val_u64`, `xce_val_fval`, `xce_val_str`, `xce_val_bool`) to preamble; add `OPCode_notify` case in `go_push_handler` + `handleNotifyData()` for `NotifyData_data_schedUpdateResvals`; iterate resvals with nil guard on `cResvalToDistribution(vp)` — skip entries that return nil (logs warning for nil vp.val). Do NOT add `OPCode_update` handler — that is a worker→controller message; the apiserver never receives it. | -| P1-1 | `backend/convert.go` | Add `cResvalToDistribution()` — constructs `*models.ResourceDistributionInfo` from `*C.xce_resval_t`; returns `nil` (with warning log) if `vp.val == nil` instead of returning partial struct. Switch on `vp.val` (already `*C.xce_val_t`, no `&`) using `Value_u_*` constants; handle all 7 cases separately: `Value_u_ivalue32` → `NUMERIC` via `xce_val_i32` (NOT i64; ivalue32 is 4 bytes), `Value_u_ivalue64` → `NUMERIC` via `xce_val_i64`, `Value_u_uvalue32` → `NUMERIC` via `xce_val_u32` (NOT u64), `Value_u_uvalue64` → `NUMERIC` via `xce_val_u64`, `Value_u_fvalue` → `NUMERIC` via `xce_val_fval`, `Value_u_svalue` → `STRING` via `xce_val_str`, `Value_u_bvalue` → `BOOLEAN` via `xce_val_bool`. Do NOT combine i32/i64 or u32/u64 — each must use its own typed accessor. **`cResdefToModel()` already exists** (added in P0-1 for `xce_resdef_t` → `ResourceInfo`) — do NOT add a second definition. The existing `cResourceToModel(res *C.xce_resource_t) *models.ResourceDefinitionInfo` (at `convert.go:96`) serves a different purpose (worker push path for resource definitions) and is not related to P1-1. | -| P1-1 | `backend/notification.go` | No change — reuse existing `OnResourceLocationUpdated(*models.ResourceDistributionInfo)`; do NOT add `OnResourceValUpdated` | -| P1-1 | `backend/handler.go` | No change — existing `DefaultHandler.OnResourceLocationUpdated` already writes to `store.ResourceLocations` | -| P1-2 | `include/resreq.h` | Replace empty `xce_resreq_select_` with expression tree types; add enum types; add `extern` declarations for `parse_select`, `eval_select`, `free_select` | -| P1-2 | `lib/xce_select.peg` | New PEG grammar for select boolean expressions (with N-ary chain accumulation) | -| P1-2 | `lib/resreq.c` | Add `parse_select()`, `eval_select()`, `free_select()` (free_select frees node tree only — caller frees container); update `kill_primary_resreq()` to add `if (resreq->select) { free_select(resreq->select); FREEUP(resreq->select); }` before `xlist_fini` — both calls required: free_select for the tree, FREEUP for the xce_select_t struct | -| P1-2 | `lib/meson.build` | Verify glob vs explicit; add `xce_select.peg` if explicit | -| P1-2 | `backend/clib.go` | Add `EvalSelectForHost()` using `cgo.Handle` for callback context | -| P1-2 | `controllers/hosts.go` | Implement `FilterHostByResReqSelect` using `EvalSelectForHost`; update `preCheckHostRequest()` to reduce select expression limit from 4094 chars to 1024 bytes (see Input safety section) | -| P1-3 | `backend/clib.go` | Add `heartbeatIntervalSecs int32` atomic (default 30), `SetHeartbeatInterval(secs int)`, `heartbeatFn` var for test injection, `StartHeartbeat(ctx context.Context)` with context cancellation and per-tick interval re-read | -| P1-3 | `backend/handler.go` | `OnClusterUpdated` calls `SetHeartbeatInterval(cluster.HeartbeatInterval)` after storing to Clusters | -| P1-3 | `cmd/main.go` | Create root `context.WithCancel`; call `backend.StartHeartbeat(ctx)` after `RegisterToBackend` | - -## Verification - -1. **P0-1**: After implementing, restart API server → verify stores are populated from initial config push (check `/xce/v1/hosts`, `/xce/v1/queues`, `/xce/v1/resources/definition` endpoints return data immediately after startup, not just after change events) - -2. **P0-2**: `POST /xce/v1/hosts/control` with `{"action": "close", "host_name": ["hostname"]}` should forward to controller and return success (not the current stub error). Test both `open` and `close` actions. - -3. **P1-1**: After a worker updates its resource values, verify the API server receives the push and updates `ResourceLocations` store entries. Check via `GET /xce/v1/resources/distribution`. - -4. **P1-2**: `POST /xce/v1/hosts/select` with `{"select": "type == LINUX64 && max_mem > 64"}` should return matching hosts from the store. - -5. **P1-3**: Write a unit test for `StartHeartbeat` that replaces the C call with a counter. The test must not depend on real time — use a fake ticker or inject the tick channel: -```go -func TestStartHeartbeat_TicksAndStops(t *testing.T) { - // Replace the C heartbeat call with an atomic counter (inject via function var) - var callCount int32 - origFn := heartbeatFn - heartbeatFn = func(secs int) int { atomic.AddInt32(&callCount, 1); return 0 } - defer func() { heartbeatFn = origFn }() - - ctx, cancel := context.WithCancel(context.Background()) - atomic.StoreInt32(&heartbeatIntervalSecs, 1) // 1s for test speed - StartHeartbeat(ctx) - - time.Sleep(3500 * time.Millisecond) - cancel() - time.Sleep(100 * time.Millisecond) // let goroutine exit - - n := atomic.LoadInt32(&callCount) - if n < 2 || n > 5 { - t.Errorf("expected 2-5 heartbeat calls in 3.5s, got %d", n) - } -} -``` -To support injection, declare `var heartbeatFn func(secs int) int` in `clib.go` and have `StartHeartbeat` call it instead of `C.xcecli_heartbeat` directly. The test verifies: (a) the goroutine fires, (b) `cancel()` stops it with no further calls after context cancellation. - -6. **Build verification**: `make test` in `src/frontend/` passes. C components build with `ninja -C build`. - -7. **RBAC verification**: Confirm both new routes are registered under the JWT + RBAC middleware chain in `routers.go`. Verify that `POST /xce/v1/hosts/control` returns 403 for non-admin users and `POST /xce/v1/hosts/select` returns results for any authenticated user. Verify that `config/rbac.yaml` contains `host:control` and `host:view` action entries. - -8. **Input safety verification**: Test `POST /xce/v1/hosts/select` with a select expression exceeding 1024 bytes — must return HTTP 400. Test with an invalid expression (e.g., `"` unclosed quote) — must return a parse error, not crash the server. Test `POST /xce/v1/hosts/control` with `host_name` list exceeding 256 entries — must return HTTP 400. - -**Rate limiting**: both `/xce/v1/hosts/control` and `/xce/v1/hosts/select` must be registered under the existing RateLimit middleware group in `routers.go`. The select endpoint is particularly sensitive: the PEG parse cost can be exploited for CPU exhaustion if rate-limited too loosely. Confirm in the route registration that both endpoints inherit the global rate limiter. - -[feedback] Follow tdd process \ No newline at end of file diff --git a/src/docs/apiserver-backend-gaps.md b/src/docs/apiserver-backend-gaps.md deleted file mode 100644 index 269148f..0000000 --- a/src/docs/apiserver-backend-gaps.md +++ /dev/null @@ -1,225 +0,0 @@ -# API Server Backend Gap Analysis - -Source: `src/controller/testsuite/test.c` (C test tool) vs `src/frontend/apiserver/` (Go API server) - -## Overview - -The C test tool (`test.c`) directly calls `xcecli_*` C library functions to interact -with the controller. The Go API server currently operates in a **push-based, read-only-from-store** -model: the controller pushes data (jobs, workers, queues, resources) via Cap'n Proto, and -the API server reads from its in-memory stores. Write/control operations are forwarded -via the CGO backend layer, but only a subset of the C API is wired up. - ---- - -## Currently Implemented (Backend Forwards to C Controller) - -| C Test Command | C API Call | Go Backend Function | REST Endpoint | -|----------------|------------------------|-------------------------|------------------------------------| -| `jobsub` | `xcecli_jobsubmit()` | `backend.SubmitJob()` | `POST /xce/v1/jobs/create` | -| `jobkill/jobckpt` | `xcecli_jobctrl()` | `backend.ControlJob()` | `POST /xce/v1/jobs/:jobids/control` | -| `qctrl` | `xcecli_queuectrl()` | `backend.ControlQueue()`| `POST /xce/v1/queues/control` | -| *(partial)* | `xcecli_hostctrl()` (N/A) | `backend.ControlHost()` **stub only** | `POST /xce/v1/hosts/control` | - -Push notifications (read path, already working via `handlePush`): - -- Job updates via `OnJobUpdated` -> `store.Jobs` -- Worker/host updates via `OnHostUpdated` -> `store.Hosts` -- Queue updates via `OnQueueUpdated` -> `store.Queues` -- Resource definitions via `OnResourceUpdated` -> `store.Resources` -- Resource locations via `OnResourceLocationUpdated` -> `store.ResourceLocations` - ---- - -## NOT Implemented -- Backend Request Gaps - -### 1. Resource Value Query (`cmd_resval` -> `xcecli_resval()`) - -- **What it does**: Queries current numeric/string values of a named resource on a - specific host (or cluster-wide). Returns typed values (float, string, bool). -- **REST impact**: No `GET /xce/v1/resources/values` endpoint exists. The resource - controller only serves definitions and distributions, not live values. -- **Priority**: **High** -- Essential for monitoring dashboards to show real-time - `mem`, `r1m`, `slots` etc. - -[feedback] api server will not pull resources from controller, it just waits controller to push - updated resource information, so api server just handle resource information update will be OK. - -### 2. Resource Value Update (`cmd_resupdate` -> `xcecli_update_resvals()`) - -- **What it does**: Worker pushes updated resource values to the controller. -- **REST impact**: No equivalent. Currently workers call the C API directly. If the - API server should support an admin endpoint to update resource values (e.g., for - testing or override), this is missing. -- **Priority**: **Low-Medium** -- Workers typically call this directly; rarely needed - via REST. Could be useful for admin overrides. - -[feedback] This item will not be applied to api server, resource update function need to be - used to update resources information of worker node(such as cpu/memory/..., and api - server will not talke workload, so it do not need this) - -### 3. Job Dispatch (`cmd_jobrun` -> `xcecli_jobdispatch()`) - -- **What it does**: Dispatches a job to specific hosts with allocation info - (host:ntasks pairs). This is how the scheduler tells the controller to start - running a job on specific workers. -- **REST impact**: Not exposed. The `POST /xce/v1/jobs/create` handles submission, - but **dispatch** (assignment to hosts) is a separate operation currently done by - the scheduler directly. -- **Priority**: **Low** -- Dispatch is an internal scheduler->controller operation. - Not typically user-facing. - -[feedback] treat this as low priority, IBM LSF has a brun command which issued by user to - force a job to run in given host, we may need this. also cmd_jobrun() has - been used to test execution flow/protocol between controller and work daemon - -### 4. Job Info / Single Job Detail (`cmd_jobinfo` -> `xcecli_jobinfo()`) - -- **What it does**: Queries detailed info for a single job by ID, including pend - reasons. -- **REST impact**: The `GET /xce/v1/jobs/:jobids` endpoint reads from the in-memory - store, which is populated by push notifications. This works for already-known jobs - but **cannot query a job that hasn't been pushed yet**. The C `xcecli_jobinfo()` is - a synchronous request-response to the controller -- fundamentally different from - the store-read pattern. -- **Priority**: **Medium** -- Store-based reads are sufficient for most cases. The - sync query path would only matter if pushes are delayed or the store is stale. - -[feedback] no need this, as job information will be pushed to api server - -### 5. Cluster Configuration (`cmd_getconf` -> `xcecli_clusterconf()`) - -- **What it does**: Synchronously fetches the full cluster config (resources, queues, - workers, host groups, user groups, global configs). -- **REST impact**: Currently the API server relies entirely on push notifications to - populate stores. There's no way to do a one-shot **full sync** with the controller. - On startup, it joins via `xcecli_join(HostRole_apiserver)` but doesn't explicitly - request the current state. -- **Priority**: **High** -- Without an initial sync, if the API server restarts - mid-session, it loses all state until the next push. The store is stale until a - new push arrives. - -[feedback] api server need handle pushed cluster configuration - -### 6. Host Control (`backend.ControlHost()` -> `xcecli_hostctrl()`) - -- **What it does**: The C library doesn't expose `xcecli_hostctrl()` yet (the Go - stub returns an error). -- **REST impact**: `POST /xce/v1/hosts/control` exists but will always fail: - `"host control not yet supported via C library"`. -- **Priority**: **High** -- Users cannot open/close hosts via the API. - -[feedback] we need this - -### 7. Set Pending Reason (`cmd_setpend` -> `xcecli_set_pend_reason()`) - -- **What it does**: Scheduler sets pend reasons on a job (host-based or - resource-based). -- **REST impact**: No equivalent endpoint. Job pend reasons are currently populated - only via push data. -- **Priority**: **Low** -- This is a scheduler->controller internal operation. - -[feedback] set pending reason is for scheduler to set why job will be pend, this is - used for test scheduler to controller job pending api - -### 8. Run Tasks (`cmd_runtasks` -> `xcecli_runtask()`) - -- **What it does**: Launches individual tasks on specific hosts (not a full job, but - sub-task execution). -- **REST impact**: No endpoint exists. -- **Priority**: **Low-Medium** -- Used for advanced task launch scenarios. Could be - needed for MPI job management. - -[feedback] this function is used by worker to run non rank 0 tasks(this is for MPI jobs) and api server - need not handle this - -### 9. Shutdown (`cmd_shutdown` -> `xcecli_shutdown()`) - -- **What it does**: Sends shutdown command to the cluster controller. -- **REST impact**: No endpoint. Currently cluster management operations (shutdown, - restart) are not available via REST. -- **Priority**: **Medium** -- Operations teams need remote cluster control capability. - -[feedback] we may need to admin tool, which talk to controller directly for this, as normal - user do not need this at all - -### 10. Resource Requirement Select (`FilterHostByResReqSelect`) - -- **What it does**: The hosts `POST /select` endpoint exists but returns **empty - results** -- it's a stub: `processHostData([]utils.OrderMap{}, "")`. -- **REST impact**: `POST /xce/v1/hosts/select` is defined but non-functional. -- **Priority**: **Medium** -- This is the XCE equivalent of `lsload -R` / host - matching by resource requirements. Important for job submission workflows to - find eligible hosts. - -[feedback] we may need this - ---- - -## Enhancement Proposal (Prioritized) - -| Priority | Enhancement | Effort | Description | -|----------|---------------------------------------------|------------|-------------| -| **P0** | Initial state sync via `xcecli_clusterconf()` | Medium | On startup (after `RegisterToBackend`), call `xcecli_clusterconf()` to do a full state sync into stores. Prevents stale stores after API server restart. | -| **P0** | Implement `ControlHost()` in C library + Go wrapper | Medium | Expose `xcecli_hostctrl()` in `client.h`, then replace the Go stub in `clib.go` with a real CGO call. | -| **P1** | Resource value query endpoint | Medium | Add `GET /xce/v1/resources/values?host=X&name=Y` -> `backend.QueryResourceValues()` -> `xcecli_resval()`. This is a synchronous request-response pattern (different from push). | -| **P1** | Implement `FilterHostByResReqSelect` | Medium-High| Wire `POST /xce/v1/hosts/select` to evaluate resource requirement expressions against current host state from the store. | -| **P2** | Cluster shutdown endpoint | Low | Add `POST /xce/v1/clusters/control` -> `backend.ShutdownCluster()` -> `xcecli_shutdown()`. Should be admin-only with RBAC. | -| **P2** | Resource value update endpoint | Low | Add `POST /xce/v1/resources/values/update` -> `backend.UpdateResourceValues()` -> `xcecli_update_resvals()`. Admin/testing use. | -| **P3** | Task run endpoint | Low-Medium | Add `POST /xce/v1/tasks/run` -> `backend.RunTask()` -> `xcecli_runtask()`. For advanced MPI task management. | -| **P3** | Set pending reason endpoint | Low | Add `POST /xce/v1/jobs/:jobid/pending-reason` -> `backend.SetPendReason()` -> `xcecli_set_pend_reason()`. Internal/scheduler-facing only. | - ---- - -## Architecture Note: Synchronous vs Push-Based - -The biggest design decision lurking here: several of these C APIs (`xcecli_resval()`, -`xcecli_clusterconf()`, `xcecli_jobinfo()`) are **synchronous request-response** calls --- the client sends a request and blocks until the controller replies. This is -fundamentally different from the current **push-based** pattern where the controller -asynchronously pushes updates. - -To implement these, we'd need to either: - -1. **Direct CGO call** (simpler but blocks the Go goroutine -- acceptable if calls - are fast and we set timeouts) -2. **Request-response via push channel** (more complex -- send request, register a - wait, receive push reply) - -Recommendation: option 1 for initial implementation (it's what `SubmitJob` and -`ControlJob` already do), with timeouts and goroutine isolation to prevent a slow -controller from blocking the API server. - ---- - -## Additional C API Calls Not Used Anywhere (Reference) - -These exist in `client.h` but are not called by `test.c` either: - -| C API Call | Purpose | -|--------------------------|---------| -| `xcecli_hello()` | Health check / greeting | -| `xcecli_nop()` | No-op heartbeat | -| `xcecli_heartbeat()` | Periodic heartbeat | -| `xcecli_notify_jobstart()`| Worker notifies job started (with PID info) | -| `xcecli_notify_jobfail()` | Worker notifies job failed | -| `xcecli_notify_jobstop()` | Worker notifies job stopped | -| `xcecli_notify_jobresume()`| Worker notifies job resumed | -| `xcecli_notify_jobpostdone()`| Worker notifies job post-exec done | -| `xcecli_update_jusage()` | Worker updates job resource usage | -| `xcecli_notify()` | Generic notification | -| `xcecli_notify_taskstart()`| Worker notifies task started | -| `xcecli_notify_taskfail()`| Worker notifies task failed | -| `xcecli_notify_taskfinish()`| Worker notifies task finished | -| `xcecli_clear_reason()` | Clear pend reasons for jobs | -| `xcecli_block_tasks()` | Block task processing | -| `xcecli_unblock_tasks()` | Unblock task processing | -| `xcecli_get_my_endpoint()`| Get local endpoint info | -| `xcecli_get_myinfo()` | Get local peer info | - -[feedback] I think we just need heartbeat to tell controller that I'm alive, and other - functions for worker and scheduler - -These are primarily worker->controller notifications. They would be needed if -the API server were to act as a proxy for worker daemons, which is not the -current design. diff --git a/src/docs/apiserver-backend-integration-test-plan.md b/src/docs/apiserver-backend-integration-test-plan.md deleted file mode 100644 index 2a03d52..0000000 --- a/src/docs/apiserver-backend-integration-test-plan.md +++ /dev/null @@ -1,459 +0,0 @@ -# Integration Test Plan — P0 + P1 Features - -## Purpose - -Verify end-to-end correctness of every feature delivered by tasks P0-1 through P1-3, -exercising the full stack: handler → store → handler merge → store readback. -These tests **do not** require a live C controller or CGO — they use the pure-Go stores -and `DefaultHandler` directly, which is what unit tests already do. The integration layer -adds: **multi-step sequences**, **cross-feature interactions**, and **edge-case coverage** -that unit tests leave out. - ---- - -## Test Environment - -- All tests run with `CGO_ENABLED=0` (pure Go) -- Each test calls `store.InitStores()` to reset all global state -- `utils.Log = zap.NewNop()` to suppress log output -- **§1–§5, §7, §8**: call handler/store methods directly — no HTTP server required -- **§6 (RBAC)**: requires a test HTTP server via `httptest.NewRecorder` with a full Gin router; JWT tokens must be real HS256-signed tokens using the configured signing secret (typically `"xce-api-key"` in test config); `ctx.Set("user", "admin")` does **not** satisfy `GetUsernameFromToken()` which reads and parses the `Authorization` header - - **JWT IP binding:** `isValidToken` checks `claims.IP == ctx.ClientIP()`; in `httptest`, `ClientIP()` reads from `req.RemoteAddr` — set `req.RemoteAddr = "127.0.0.1:0"` on every test request and embed `"ip": "127.0.0.1"` in the JWT claims; a mismatch returns 401 for the wrong reason, silently invalidating the test - - **Auth config:** `isValidToken` dereferences `utils.AuthenticationYamlConfig`, a package-level pointer that is `nil` until `LoadConfig()` is called — before any JWT test set `utils.AuthenticationYamlConfig = &utils.Authentication{Token: utils.TokenConfig{SecretKey: "xce-api-key"}}` directly; do not call `LoadConfig()` (reads a file that won't exist in CI) - ---- - -## 1. P0-1: Cluster Config Push - -### 1.1 Config push populates all stores in a single call - -**Steps:** -1. Call `dispatchConfigPush(handler, queues, resources, hostConfigs, cluster)` with non-nil data for all four. -2. Verify `store.Queues`, `store.Resources`, `store.Hosts`, `store.Clusters` all contain the pushed data. - -**Asserts:** A single config push updates all four store types in sequence (queues → resources → hosts → cluster); the four updates are NOT atomic — a concurrent reader may see a partial state. - -### 1.2 Second config push merges (does not replace) - -**Steps:** -1. Seed `store.Hosts` with worker-sourced data (HostStatus, CPUFactor, NumCPUs, etc.) -2. Call `h.OnHostConfigUpdated()` with config-sourced fields (HostModel, HostType, MaxSlot) -3. Call `h.OnHostConfigUpdated()` a second time with `HostModel: "modelB"` (distinct from step 2's "modelA") -4. Verify worker-sourced fields from step 1 are still preserved -5. Verify `HostModel == "modelB"` (config-sourced field reflects the second push, not the first) - -**Asserts:** Partial merge is idempotent and correctly preserves the other source's fields across multiple pushes. - -### 1.3 Cluster update with zero HeartbeatInterval preserves existing value - -**Steps:** -1. `store.Clusters.Put("c1", ClusterInfo{HeartbeatInterval: 45})` -2. Call `h.OnClusterUpdated(&ClusterInfo{ClusterName: "c1", HeartbeatInterval: 0, Vcpus: 8})` -3. Verify `HeartbeatInterval` is still 45 (zero is ignored per `if incoming.HeartbeatInterval > 0` guard) - -**Asserts:** Cluster push with `HeartbeatInterval=0` does not zero out the stored interval. - -### 1.4 Config push with nil cluster argument is a no-op - -**Steps:** -1. Call `dispatchConfigPush(handler, nil, nil, nil, nil)` -2. Verify `store.Clusters.Count() == 0` - -**Covers:** `dispatchConfigPush` skips the cluster update when the cluster argument is nil. (The empty-name guard lives in the CGO layer `cClusterConfToClusterInfo` and is not reachable in `CGO_ENABLED=0` tests; a `ClusterInfo{ClusterName:""}` passed directly would be stored under an empty key.) - -### 1.5 Config push with nil queues/resources/hosts is safe - -**Steps:** -1. Call `dispatchConfigPush(handler, nil, nil, nil, nil)` -2. Verify no panics, no store entries. - -**Covers:** Nil-safety of the dispatch loop. - ---- - -## 2. P0-2: Host Control via Backend - -### 2.1 Valid control action (open/close) routes through to backend - -**Steps:** -1. `store.Hosts.Put("node01", HostInfo{HostName: "node01"})` -2. Call `preCheckHostControlRequest(&HostControlRequest{ControlAction: "open", Hostname: []string{"node01"}})` -3. Assert `allFlag == false`, `err == nil` - -**Asserts:** Valid actions pass pre-check. - -### 2.2 Invalid action is rejected - -**Steps:** -1. Call `preCheckHostControlRequest(&HostControlRequest{ControlAction: "reboot", Hostname: []string{"node01"}})` -2. Assert error is returned. - -**Asserts:** Only "open" and "close" are accepted. - -### 2.3 Comment length limit (512 chars) - -**Steps:** -1. Call `preCheckHostControlRequest` with `Comment` of 513 chars -2. Assert error -3. Call with 512 chars — assert no error - -**Already covered in unit tests.** Integration adds: verify the error message is human-readable. - -### 2.4 Hostname validation checks store existence - -**Steps:** -1. `store.Hosts.Put("node01", HostInfo{HostName: "node01"})` -2. Call `validateHost(ctx, action, []string{"node01", "nonexistent"})` -3. Assert `node01` in success list, `nonexistent` in failed map - -**Note:** `validateHost` calls `GetUsernameFromToken()` internally, requiring the same JWT setup as §6 — set `utils.AuthenticationYamlConfig`, set `req.RemoteAddr = "127.0.0.1:0"`, embed `"ip": "127.0.0.1"` in the JWT claims, and pass the token via `Authorization` header. `ctx.Set("user", "admin")` is **not** sufficient. See §6 Test Environment notes for the full setup checklist. Unlike §2.1–2.3, this test is grouped with the §6 JWT-required tests in `controllers/integration_test.go`. - -### 2.5 RBAC: host:control requires cluster_admin role - -**Steps:** -1. Load RBAC config with `cluster_admin` having `host:control` -2. Use `httptest.NewRecorder` + Gin router with a spy handler that sets a response body -3. Call with a user that is NOT cluster_admin — assert 403 response -4. Call with cluster_admin user — assert 2xx and spy handler body present - -**Note:** `RequirePermission` short-circuits for `cluster_admin` via early `return` (without calling `ctx.Next()`). Asserting `ctx.IsAborted() == false` gives a **false pass** — the middleware doesn't abort, but the handler is also never called. Use an HTTP recorder to verify the handler response actually appeared. - -**Covers:** Route middleware integration. - -### 2.6 RBAC: host:view accessible to basic_user - -**Steps:** -1. Load RBAC config with `basic_user` having `host:view` -2. Call `RequirePermission("host:view")` with basic_user -3. Assert request proceeds - -### 2.7 Concurrent control requests do not race - -**Already covered:** `TestPreCheckHostControlRequest_NoRace` (50 goroutines). -Integration adds: test that concurrent `ControlHost` calls to the same host don't corrupt store state. - -### 2.8 Batch response construction - -**Steps:** -1. Build success and failed slices directly (do NOT call `ControlHost` — it calls the CGO stub which returns `errNoCGO` under `CGO_ENABLED=0`): - - `succeededItems := []map[string]interface{}{{"node": "node01"}, {"node": "node02"}}` - - `failedItems := []map[string]interface{}{{"node": "bad", "reason": "not found"}}` -2. Call `BuildBatchOperationResponse("close", "host", succeededItems, failedItems)` -3. Verify returned status is `"partially_accepted"`, success list has 2 entries, failed map has 1 - -**Covers:** Batch response construction logic; the CGO backend call is out of scope for pure-Go integration tests. - ---- - -## 3. P1-1: Resource Value Push - -### 3.1 All 7 value types convert correctly (pure-Go path) - -**Steps:** -1. For each value type (i32, i64, u32, u64, fval, sval, bval): - - Create `rawResvalData` with that type - - Call `rawResvalToDistribution(r)` - - Assert `ValueType`, `NumericValue`/`StringValue`/`BooleanValue` match expected - -**Already covered in unit tests.** Integration adds: round-trip through `OnResourceLocationUpdated`: -2. Call `h.OnResourceLocationUpdated(rd)` for each type -3. Read back from `store.ResourceLocations` using composite key `name:host` -4. Assert stored values match - -### 3.2 Nil val produces nil return (no store update) - -**Steps:** -1. Create `rawResvalData{valNil: true, ...}` -2. Assert `rawResvalToDistribution` returns nil -3. Assert `store.ResourceLocations.Count() == 0` - -### 3.3 Unknown discriminant produces nil return with warn log - -**Steps:** -1. Create `rawResvalData{valWhich: 99, ...}` -2. Assert `rawResvalToDistribution` returns nil -3. Assert `store.ResourceLocations.Count() == 0` - -### 3.4 Multiple resource values in a single push - -**Steps:** -1. Call `h.OnResourceLocationUpdated(rd1)` then `h.OnResourceLocationUpdated(rd2)` with different `name:host` keys -2. Assert `store.ResourceLocations.Count() == 2` -3. Assert each key returns the correct value - -### 3.5 Resource value update overwrites previous value - -**Steps:** -1. `h.OnResourceLocationUpdated(rd)` with `NumericValue: 100.0` -2. `h.OnResourceLocationUpdated(rd)` with same `name:host` but `NumericValue: 200.0` -3. Assert stored value is 200.0 (last-write-wins) - -**Covers:** Store `Put` is a full replacement, not merge. - -### 3.6 Composite key format is `res_name:location` - -**Steps:** -1. Push a resource with `ResourceName: "mem"` and `Location: "node01"` -2. Assert `store.ResourceLocations.Has("mem:node01") == true` -3. Assert `store.ResourceLocations.Has("mem") == false` - ---- - -## 4. P1-3: Heartbeat Keep-Alive - -> **Isolation requirement:** `heartbeatIntervalSecs` is a package-level `var int32` in the `backend` package shared across all tests in that package. Tests in this section MUST NOT call `t.Parallel()`. Run the full heartbeat test group sequentially to avoid cross-test interference via `SetHeartbeatInterval`. - -### 4.1 Heartbeat interval updates on cluster config push - -**Steps:** -1. `atomic.StoreInt32(&heartbeatIntervalSecs, 30)` (default) -2. Call `h.OnClusterUpdated(&ClusterInfo{ClusterName: "c1", HeartbeatInterval: 45})` -3. Assert `atomic.LoadInt32(&heartbeatIntervalSecs) == 45` - -**Covers:** The P1-3 integration point — cluster config push triggers heartbeat interval change. - -### 4.2 Cluster push with HeartbeatInterval=0 preserves current interval - -**Steps:** -1. `atomic.StoreInt32(&heartbeatIntervalSecs, 45)` -2. Call `h.OnClusterUpdated(&ClusterInfo{ClusterName: "c1", HeartbeatInterval: 0})` -3. Assert `atomic.LoadInt32(&heartbeatIntervalSecs) == 45` (unchanged) - -**Covers:** The `> 0` guard in `OnClusterUpdated` and `SetHeartbeatInterval`. - ---- - -## 5. Cross-Feature Integration - -### 5.1 Config push updates heartbeat interval AND stores cluster data - -**Steps:** -1. Default `heartbeatIntervalSecs = 30` -2. Call `dispatchConfigPush(h, nil, nil, nil, &ClusterInfo{ClusterName: "c1", HeartbeatInterval: 60, Vcpus: 32})` -3. Assert `store.Clusters.Get("c1")` has `HeartbeatInterval=60, Vcpus=32` -4. Assert `atomic.LoadInt32(&heartbeatIntervalSecs) == 60` - -**Covers:** P0-1 + P1-3 interaction in a single dispatch. - -### 5.2 Config push + host control on same host - -**Steps:** -1. `dispatchConfigPush(h, nil, nil, []HostInfo{{HostName: "node01", HostModel: "x86_64"}}, nil)` -2. Assert `store.Hosts.Get("node01")` has `HostModel="x86_64"` -3. Assert `store.Hosts.Has("node01") == true` — verifies config-push data is visible in the host store -4. Call `preCheckHostControlRequest(&HostControlRequest{ControlAction: "close", Hostname: []string{"node01"}})` — assert `allFlag == false`, `err == nil` (validates action format; store lookup is handled by `validateHost` which requires JWT — see §2.4 note) - -**Covers:** Data created by config push is written to the host store and is visible to subsequent operations. - -### 5.3 Resource push after host config push — same host referenced - -**Steps:** -1. `h.OnHostConfigUpdated(&HostInfo{HostName: "node01", HostModel: "x86_64"})` -2. `h.OnResourceLocationUpdated(&ResourceDistributionInfo{ResourceName: "mem", Location: "node01", NumericValue: 65536.0, ValueType: NUMERIC, IsDynamic: true})` -3. Assert `store.Hosts.Get("node01")` has `HostModel="x86_64"` (preserved) -4. Assert `store.ResourceLocations.Get("mem:node01")` has `NumericValue=65536.0` -5. Assert `store.Hosts.Get("node01").HostModel` still "x86_64" (host config was not overwritten) - -**Covers:** Two independent push paths don't interfere with each other's store data. - -### 5.4 Worker push after config push preserves config fields - -**Steps:** -1. `h.OnHostConfigUpdated(&HostInfo{HostName: "node01", HostModel: "x86_64", MaxSlot: 8})` -2. `h.OnHostUpdated(&HostInfo{HostName: "node01", HostStatus: 3, CPUFactor: 2.5, NumCPUs: 16})` -3. Assert `got.HostModel == "x86_64" && got.MaxSlot == 8` (config preserved) -4. Assert `got.HostStatus == 3 && got.CPUFactor == 2.5` (worker updated) - -**Covers:** Two-push merge correctness — already tested in unit tests but verified here at integration scope. - -### 5.5 Multiple sequential config pushes (idempotent) - -**Steps:** -1. Push config with `ClusterInfo{Vcpus: 16, HeartbeatInterval: 30}` -2. Push config with `ClusterInfo{Vcpus: 32, HeartbeatInterval: 60}` -3. Assert store has `Vcpus=32, HeartbeatInterval=60` (last-write-wins for config fields) -4. Assert `heartbeatIntervalSecs == 60` - -**Covers:** Rapid config push updates don't leave stale data. - ---- - -## 6. RBAC Integration (End-to-End) - -> **RBAC isolation:** Call `resetRBACState()` (not `store.InitStores()`) at the start of each RBAC test. `resetRBACState()` zeros `rbacConfig`, preventing `AddPermissionsForRole` from appending duplicate permissions across test reloads. `store.InitStores()` does not reset RBAC state. - -### 6.1 Full middleware chain: JWT → RBAC → handler - -**Steps:** -1. Set up Gin router with real middleware (`RequirePermission("host:control")`) -2. Create a valid JWT token for a cluster_admin user -3. POST `/xce/v1/hosts/control` with `action=close, host_name=["node01"]` -4. Assert 202 Accepted (or mocked backend response) - -5. Create a valid JWT token for a basic_user -6. POST `/xce/v1/hosts/control` — assert 403 Forbidden - -7. POST `/xce/v1/hosts/select` with basic_user — assert passes (host:view) - -**Note:** This requires spinning up a test HTTP server via `httptest.NewRecorder`. Do not mock at the middleware level — the purpose of §6 is to exercise the real middleware chain end-to-end. - -### 6.2 RBAC: cluster_admin bypasses permission check - -**Steps:** -1. Set up Gin router with `RequirePermission("host:control")` -2. Sign a JWT for "admin1" with role "cluster_admin" and issue `POST /xce/v1/hosts/control` -3. Assert response status is **not 403** — verifies the middleware did not block the request - -**Note:** `RequirePermission` returns early for `cluster_admin` without calling `ctx.Next()`, so downstream handlers are **never reached**. Do not assert a spy handler body or `ctx.IsAborted() == false` — both give false results. To verify full handler execution for a privileged user, write a separate test with a non-cluster_admin user that has explicit `host:control` permission (see §6.3). - -### 6.3 RBAC: basic_user cannot control hosts but can view - -**Steps:** -1. Assign user "user1" role "basic_user" -2. Call `RequirePermission("host:control")` — assert 403 -3. Call `RequirePermission("host:view")` — assert passes - -### 6.4 JWT algorithm confusion is rejected - -**Steps:** -1. Configure test server with HS256 signing secret `"xce-api-key"` -2. Craft a token header claiming `"alg": "none"` or a mismatched algorithm (RS256) -3. POST to `/xce/v1/hosts/control` with that token (use valid IP binding so IP mismatch is not the cause of rejection) -4. Assert 401 Unauthorized -5. Assert response body contains a token/signature error string (e.g., `"token"`, `"invalid"`, or `"signature"`) — not `"ip"` or `"expired"` — to confirm the rejection is due to algorithm/signature failure, not an unrelated check - -**Covers:** Prevents algorithm confusion attacks where an attacker downgrades signing to `none`. - -### 6.5 Expired JWT is rejected - -**Steps:** -1. Sign a JWT with `exp = time.Now().Unix() - 3600` (expired 1 hour ago) -2. POST to any protected endpoint -3. Assert 401 Unauthorized - -**Covers:** Token replay after expiry — ensures expired tokens cannot be reused. - -### 6.6 Known gap: hostgroup domain restriction bypass - -> **Documents a known limitation, not a working feature.** `validateHost` at `hosts.go:505-507` contains a `// TODO` that silently skips hostgroup domain enforcement. This test makes the gap explicit so it is visible in code review and prevents accidental regression if the TODO is removed. - -**Steps:** -1. Provision a user with `host:control` scoped to hostgroup "gpu-nodes" -2. Issue `POST /xce/v1/hosts/control` targeting a host NOT in "gpu-nodes" -3. **Assert request is accepted** (not 403) — documents that hostgroup scoping is not yet enforced - -**Note:** When P1-2b implements hostgroup enforcement, flip this assertion to assert 403 and remove the `// TODO` marker. - -### 6.7 Post-logout token reuse - -> **Design gap:** JWTs are stateless and the current server does not maintain a JTI blacklist. A token valid at logout time remains valid until expiry. This test documents the current behavior as an explicit design decision. - -**Steps:** -1. Sign a valid JWT with a 1-hour expiry -2. Call `POST /xce/v1/users/logout` (or equivalent) — record any logout response -3. Immediately reuse the same token on `GET /xce/v1/hosts` — assert **200 OK** (not 401) - -**Note:** If a JTI blacklist is added in future, flip this assertion to expect 401 and add the blacklist provisioning step. - ---- - -## 7. Store Thread Safety - -> **CI requirement:** All §7 tests must run with `-race`: `go test -race ./store/...`. A test that passes without `-race` provides no guarantee of absence of data races — the Go race detector instruments memory accesses at runtime and is the authoritative check. - -### 7.1 Concurrent config pushes don't corrupt data - -**Steps:** -1. Start 10 goroutines, each calling `h.OnHostConfigUpdated(&HostInfo{HostName: "node01", ...})` with slightly different HostModel values -2. Wait for all goroutines to complete -3. Assert `store.Hosts.Get("node01")` returns a valid HostInfo (no zero-value corruption) -4. Assert `HostName` field is "node01" - -**Race detection note:** A simple value-validity assertion cannot prove absence of a data race — concurrent writes all produce plausible values. Run this test with `go test -race ./store/...` to detect RMW races via the Go race detector. The assertion above verifies structural integrity; `-race` detects the underlying race condition. - -### 7.2 Concurrent host control + config push - -**Steps:** -1. Goroutine A: call `OnHostConfigUpdated` for "node01" in a loop -2. Goroutine B: call `validateHost` checking "node01" existence in a loop -3. Assert no panics and no store corruption after 100 iterations - -### 7.3 Concurrent resource value pushes for same key - -**Steps:** -1. Start 10 goroutines, each calling `OnResourceLocationUpdated` for `"mem:node01"` with different NumericValue -2. Assert final stored value is one of the 10 values (no corruption) -3. Assert key exists exactly once - ---- - -## 8. Input Safety - -### 8.1 Hostname length limits - -> **Skip until P1-2b is implemented.** No hostname length validation exists in `preCheckHostControlRequest` yet — this test will pass vacuously. Add `//go:build p1_2b` build tag or comment out pending that task. - -**Steps:** -1. Call `preCheckHostControlRequest` with hostname exceeding the P1-2b limit (>1024 chars) -2. Assert `err != nil` with message indicating length exceeded - -### 8.2 Empty hostname list - -**Steps:** -1. Call `preCheckHostControlRequest` with `Hostname: []` -2. Assert `err != nil` — inspect the actual error message from `preCheckHostControlRequest` and assert it contains the expected string (e.g., "no hostnames provided" or similar) - -### 8.3 Select expression length (current limit: 4094) - -**Steps:** -1. Call handler with `Select` string > 4094 chars -2. Assert error -3. Call with 4094 chars — assert accepted - -### 8.4 Special characters in hostnames - -**Steps:** -1. Call with hostname containing `` -2. Assert the hostname is stored as a string without interpretation (XSS safety at API layer) - ---- - -## Test File Organization - -| File | Tests | -|------|-------| -| `backend/integration_test.go` | §1 (config push), §3 (resource push), §4 (heartbeat), §5 (cross-feature) | -| `controllers/integration_test.go` | §2.1–2.3, §2.5–2.8 (host control — no JWT required), §2.4 (host validation — **requires full JWT setup; see §6 prerequisites**), §6 (RBAC middleware), §8 (input safety) | -| `store/concurrency_test.go` | §7 (thread safety) | - -All test files use `//go:build !cgo` or `CGO_ENABLED=0` compatible patterns. - -**Package declarations:** -- `backend/integration_test.go` must declare `package backend` (not `package backend_test`) to access unexported symbols: `heartbeatIntervalSecs`, `rawResvalToDistribution`, `dispatchConfigPush` -- `controllers/integration_test.go` may use `package controllers_test` for black-box tests, but any test accessing unexported helpers must use `package controllers` - -**JWT signing secret in tests:** Integration tests in `controllers/integration_test.go` that create real JWTs must use a test-only signing secret (e.g., `"xce-api-key"` from the test config file). Never use the production signing secret. Document the expected test secret in a comment at the top of the test file so it is clearly identifiable during security audits. - ---- - -## Priority Classification - -| Priority | Tests | Rationale | -|----------|-------|-----------| -| **P0 — Must have** | 1.1, 1.2, 1.3, 2.1, 2.2, 2.5, 3.1, 3.4, 4.1, 5.1 | Core functionality and merge correctness | -| **P1 — Should have** | 1.4, 1.5, 2.4, 2.6, 2.8, 3.2, 3.3, 3.5, 3.6, 4.2, 5.2, 5.3, 6.1, 6.2, 6.3, 6.4, 6.5, 6.6, 6.7 | Edge cases, RBAC, JWT security, and known gap documentation | -| **P2 — Nice to have** | 2.3, 2.7, 5.4, 5.5, 7.1, 7.2, 7.3, 8.1–8.4 | Robustness and stress | - ---- - -## Existing Test Coverage - -The following unit tests already cover much of the ground above and should NOT be duplicated: - -| Existing Test File | What It Covers | Integration Gap | -|--------------------|----------------|-----------------| -| `backend/handler_test.go` | Single-push merge for hosts, clusters, dispatch | Multi-push sequences, cross-feature | -| `backend/convert_test.go` | All 7 value types, nil val, unknown discriminant | Store round-trip after conversion | -| `backend/heartbeat_test.go` | SetHeartbeatInterval, runHeartbeat call/cancel | Interval change triggered by OnClusterUpdated | -| `controllers/host_control_test.go` | preCheck validation, concurrent no-race | Full handler flow with store interaction | -| `controllers/rbac_check_test.go` | host:control/host:view permissions | Full middleware chain with JWT | \ No newline at end of file diff --git a/src/docs/apiserver-backend-reviews.md b/src/docs/apiserver-backend-reviews.md deleted file mode 100644 index 72efc76..0000000 --- a/src/docs/apiserver-backend-reviews.md +++ /dev/null @@ -1,325 +0,0 @@ ---- -reviewers: [adversarial, feasibility, cgo-correctness, security, architecture] -reviewed_at: 2026-04-16T07:00:00Z -document_reviewed: apiserver-backend-enhancement-plan.md -prior_review_at: 2026-04-15T04:00:00Z ---- - -# Final Cross-Perspective Review — API Server Backend Enhancement Plan - -> **Prior review** (adversarial + feasibility, 2026-04-15) is summarised at the bottom. -> This document covers only **new findings** from the final three-reviewer pass. -> All issues flagged in the prior review are confirmed fixed in the current plan. - ---- - -## Round 2 Verification (2026-04-16) - -### Claims Verified Against Codebase - -**RBAC `cluster_admin` role**: ✅ PASS. `rbac.yaml:88` assigns `action: host:control` to `cluster_admin` role with `domain: type: all`. `routers.go:112` already wires `RequirePermission("host:control")` for `POST /xce/v1/hosts/control`. No `host_admin` role exists. The plan's update to `cluster_admin` is correct. - -**`go_push_handler` is single-threaded**: ✅ PASS. `clib.go:32` calls `xcecli_set_handler(ctx, handler, NULL)` — this registers ONE handler function. `clib.go:150` `go_push_handler` runs on the C library's callback thread. The C library dispatches events sequentially on this thread. There is no concurrent push scenario for a single cluster. - -### Remaining HIGH Issues Still in the Plan - -| # | Issue | Status | -|---|-------|--------| -| CGO-1 | `unsafe.Slice(conf.hconfigs, n)` — missing `conf.hconfigs == nil` guard | **FIXED** — plan now guards `if n == 0 \|\| conf.hconfigs == nil { return nil }` | -| CGO-2 | `unsafe.Slice(rvl.vals, n)` — missing `rvl.vals == nil` guard | **FIXED** — plan now guards `if n == 0 \|\| rvl.vals == nil { return 0 }` | -| SEC-1 | `recover()` claim in plan said it catches C crashes | **FIXED** — plan now states `recover()` does NOT catch C SIGSEGV; C-level hardening required | -| SEC-2 | `allFlag` package-level data race in `hosts.go:22` | **FIXED** — plan now specifies converting `allFlag` to local return value | -| ARCH-1 | `cResourceToModel` naming collision — duplicate function name | **FIXED** — P0-1 new function renamed to `cResdefToModel(r *C.xce_resdef_t) *models.ResourceInfo` | -| ARCH-4 | No RED test for `OnHostUpdated` behavioral change | **FIXED** — plan now requires `backend/handler_test.go` before implementation | -| ARCH-5 | No unit tests for `rawHostConfigToModel`/`rawClusterToModel` | **FIXED** — plan now requires table-driven tests in `convert_test.go` | -| ARCH-6 | `HostStateStr(0)` = `"OK"` for hosts with no worker data | **FIXED** — plan now specifies `HostStateStr(0)` → `"UNKNOWN"` + `LastConfigSeenAt`/`LastWorkerSeenAt` timestamps | - -### Fresh Findings - -**SEC-7 — `C.GoString(nil)` undefined behavior on NULL C strings (MEDIUM)** -- `cClusterConfToClusterInfo` calls `C.GoString(conf.clustername)`. If `conf->clustername` is NULL, `C.GoString(nil)` is undefined behavior per CGO rules. -- The pattern in existing `convert.go` (e.g., `cResourceToModel` line 98) uses `goString(res.name)` — a helper that should guard against NULL. -- **Verdict**: The plan should use `C.GoString` only after a nil guard, or use the existing `goString` helper which presumably handles nil. -- **Severity**: MEDIUM (Go's `C.GoString` typically panics on nil, but this depends on C library always providing a non-NULL string for `clustername`) - -**ARCH-12 — Action string-to-integer mapping not documented (LOW)** -- The Go HTTP handler receives JSON `{"action": "open"}` but C `HOST_OPEN`/`HOST_CLOSE` are integer enum constants. The plan's P0-2 does not document where this string-to-integer mapping happens. -- The existing `ValidateControlAction` at `controllers/hosts.go:557` validates the string. The actual mapping to C constants must happen in `ControlHost()`. -- **Verdict**: Include a comment or table in `ControlHost()` documenting the mapping: `"open"` → `HOST_OPEN` (C constant), `"close"` → `HOST_CLOSE`. - -**ARCH-13 — `parse_select` errmsg ownership not specified (LOW)** -- P1-2 does `C.free(unsafe.Pointer(errmsg))` when errmsg != nil. This is correct only if `parse_select` allocates errmsg with `malloc` (or equivalent). The plan should explicitly state the memory ownership contract for the errmsg output parameter. -- **Verdict**: Add a one-line contract note: "parse_select allocates errmsg via malloc on error; caller owns and must free it." - ---- - -## CGO / C Interop Correctness Review - -### CGO-1 — `unsafe.Slice(conf.hconfigs, n)` panics when pointer is nil (HIGH) - -**Location:** P0-1, `cClusterConfHostConfigs()` in `backend/convert.go` - -**Bug:** The guard is `if n == 0 { return nil }` but there is no check for `conf.hconfigs == nil`. The Go specification states that `unsafe.Slice(ptr, n)` panics if `ptr == nil` and `n > 0`. A controller or partial-initialization path that sets `nhconfigs = N` and leaves `hconfigs = NULL` will crash the apiserver. This pattern is a systemic gap: the same nil guard is missing in the existing `cClusterConfQueues` and `cClusterConfResources` functions — the new function replicates the existing defect. - -**Fix:** -```go -if n == 0 || conf.hconfigs == nil { - return nil -} -``` - -### CGO-2 — `unsafe.Slice(rvl.vals, n)` panics when pointer is nil (HIGH) - -**Location:** P1-1, `handleNotifyData()` in `backend/clib.go` - -**Bug:** The guard `if rvl == nil { return 0 }` does not check `rvl.vals`. `xce_resval_list_t` in `typemap.h` has `int count` and `xce_resval_t** vals` — a null `vals` with non-zero `count` is a valid C state on error paths or partial serialization. `unsafe.Slice(rvl.vals, n)` with `n > 0` and `rvl.vals == nil` panics. - -**Fix:** -```go -if rvl == nil || rvl.vals == nil || n == 0 { - return 0 -} -``` - -### CGO-3 — `StartHeartbeat` goroutine blocked in CGO during shutdown (MEDIUM) - -**Location:** P1-3, `StartHeartbeat()` in `backend/clib.go` - -**Issue:** `C.xcecli_heartbeat()` is a blocking CGO call. When `ctx.Done()` fires, the goroutine can only exit after the current C call returns. If the controller is unreachable and the C call has a long (or no) timeout, the process shutdown is delayed by up to one heartbeat cycle. This is not a goroutine leak but will delay `defer cancel()` in `main.go`. Add a comment documenting this known limitation. No API change needed for initial implementation. - -### CGO-4 — Items confirmed safe (informational) - -- `req.body_which` field access: `xce_request_t.body_which` is a plain `int` at struct level, not inside the union. CGO-accessible. ✓ -- `nd.event` field: `xce_notify_data_t.event` is a plain top-level `int`. CGO-accessible. ✓ -- `(*[0]byte)(C.xce_select_get_attr)`: correct standard CGO idiom for `//export` function pointer. ✓ -- `C.uintptr_t(h)` where `h` is `cgo.Handle`: integer-to-integer cast, not a pointer conversion. Avoids `go vet` warning. ✓ - ---- - -## Security Review - -### SEC-1 — `recover()` does NOT catch C SIGSEGV — plan's stated protection is false (HIGH) - -**Location:** P1-2, "Input safety" section — "Wrap the EvalSelectForHost call in a `recover()` block" - -**Bug:** Go's `recover()` catches Go panics only. A null pointer dereference or out-of-bounds access inside `eval_select` or `parse_select` (C code) raises SIGSEGV via the OS, which terminates the process immediately — Go defers and recover() are bypassed. The plan's claim that `recover()` protects the server from C-side crashes is incorrect and must not be used as justification for skipping C-level validation. - -**Fix:** Remove or correct the recover() claim. The actual protection must come from: -1. Hardening `parse_select`/`eval_select` with internal bounds checking and null guards in C. -2. Fuzz testing the PEG parser with a corpus before shipping. -3. Optionally running the parse/eval in a subprocess with a timeout (more complex, not required for initial implementation, but the only true isolation). - -Add a comment in the Go handler: `// Note: recover() does not catch C SIGSEGV. C-level null dereference in parse_select/eval_select will crash the process. Rely on C-level validation, not Go recovery.` - -### SEC-2 — `allFlag` package-level global is a data race on concurrent requests (HIGH) - -**Location:** `controllers/hosts.go:22`, `controllers/queues.go` (pre-existing, exposed by this plan) - -**Bug:** `var allFlag bool` is a package-level shared variable. `preCheckHostControlRequest` sets it, `ControlHost` reads it — with no synchronization between goroutines. Two concurrent `POST /hosts/control` requests can interleave: Request A sets `allFlag = false` (targeted), Request B sets `allFlag = true` (all hosts), then Request A reads `true` and silently operates on the entire cluster instead of a single host. This is a logic race that can trigger unintended cluster-wide operations. - -The plan's P0-2 test coverage (Verification step 2) will make this race more observable. The architecture reviewer confirmed it is present in the existing code; it must be fixed before P0-2 lands since the plan adds the real implementation path. - -**Fix:** Eliminate the package-level variable. Return the `allFlag` value from `preCheckHostControlRequest` as a local `bool` and pass it to `ControlHost`. The same fix applies to `queues.go`. - -### SEC-3 — In-process push data has no Go-side range check on `nrows` (MEDIUM) - -**Location:** `backend/clib.go`, `handleDataset()` — pre-existing, not introduced by this plan - -**Issue:** `unsafe.Slice(C.dataset_jobs(d), n)` constructs a Go slice over C memory where `n = int(d.nrows)`. If the C library delivers a dataset with a crafted or corrupted `nrows` exceeding the actual allocation, the slice construction succeeds but iteration reads out-of-bounds C memory. This can corrupt the in-memory store. The plan does not address this because it is pre-existing, but the new P1-1 resource push handler follows the same pattern and has the same risk. - -**Fix for P1-1:** Add a sanity bound on `rvl.count` before the `unsafe.Slice` call: -```go -const maxResVals = 65536 // sanity cap -if n > maxResVals { - logger.Warn("resval count exceeds sanity limit, truncating", zap.Int("count", n)) - n = maxResVals -} -``` - -### SEC-4 — PEG parser DoS: 1024-byte limit alone is insufficient (MEDIUM) - -**Location:** P1-2, "Input safety" — expression length limit - -**Issue:** PEG parsers without memoization (packrat parsing) have O(2^n) backtracking on adversarial inputs like `((((((((a`. A 1024-byte limit does not prevent CPU exhaustion — it sets the budget. 1024 bytes of adversarial expression can still pin a CPU core for seconds in a naive PEG implementation. - -**Mitigation required:** Verify that `xce_select.peg` generates a **packrat** (memoized) parser — packcc supports this with the `--packrat` flag or equivalent option. Document this requirement explicitly in `lib/meson.build`'s `custom_target` invocation. Without packrat, the DoS risk is real. `/hosts/select` rate limiting (already inherited from RateLimit middleware) reduces but does not eliminate the risk. - -### SEC-5 — Error message leaks internal C error codes (LOW) - -**Location:** P0-2, `ControlHost()` — `fmt.Errorf("xcecli_hostctrl failed: %d", int(rc))` - -**Issue:** Negative C return codes propagate to the HTTP response body. In HPC contexts these are typically library-specific codes (not OS errno values) and are not meaningfully sensitive. However, the current stub error at `clib.go:311` already leaks the hostname and action integer in the error string — this must be cleaned up when the stub is replaced. - -**Fix:** Map C error codes to generic messages at the API boundary: `"host control failed"` (with the code logged server-side at WARN level, not returned to the client). - -### SEC-6 — Confirmed safe (informational) - -- `host:view` permission for all authenticated users: intentional HPC design. Users need host capacity info to craft job resource requests. ✓ -- Hostname as `C.CString()`: the store lookup in `validateHost` acts as an allowlist — only controller-pushed hostnames reach C. ✓ - ---- - -## Architecture & Design Consistency Review - -### ARCH-1 — `cResourceToModel` naming collision: plan adds a duplicate with a different signature (HIGH) - -**Location:** P0-1, "convert.go" section; P1-1, "cResourceToModel note" - -**Bug:** `convert.go` already contains `cResourceToModel(res *C.xce_resource_t) *models.ResourceDefinitionInfo` (line 95-104). The plan's P0-1 describes adding `cResourceToModel(r *C.xce_resdef_t) *models.ResourceInfo` — a different input type (`xce_resdef_t` vs `xce_resource_t`) and a different output type (`ResourceInfo` vs `ResourceDefinitionInfo`). Two functions with the same name in the same package is a compile error. - -The plan's P1-1 note "cResourceToModel already exists — do NOT add a duplicate" is internally contradictory: it refers to the **existing** function (xce_resource_t → ResourceDefinitionInfo), not the new P0-1 function described in the same document. - -**Fix:** Rename the new function in P0-1 to `cResdefToModel(r *C.xce_resdef_t) *models.ResourceInfo`. Update all call sites. P1-1 can continue to use the existing `cResourceToModel` (the old one) without conflict. - -### ARCH-2 — `host_admin` RBAC role referenced in plan does not exist (HIGH) - -**Location:** P0-2, "Go Side / router/routers.go" - -**Bug:** The plan states "Permitted roles: admin users with the `host_admin` role." The actual `rbac.yaml` has three roles: `basic_user`, `cluster_admin`, `queue_admin`. There is no `host_admin` role. The `host:control` permission is already assigned to `cluster_admin`. Both routes at `routers.go:111-112` already exist with `RequirePermission("host:control")` and `RequirePermission("host:view")`. - -**Fix:** Remove all references to `host_admin` from the plan. Clarify: `host:control` → `cluster_admin` (already configured). Verification step 7 should read "returns 403 for `basic_user` and `queue_admin`, succeeds for `cluster_admin`." - -### ARCH-3 — P0-2 stubs reference P1-3 symbols: CGO build fails between phases (HIGH) - -**Location:** P0-2, "backend/stub.go" - -**Issue:** The plan adds `StartHeartbeat(ctx context.Context) {}` and `SetHeartbeatInterval(secs int) {}` stubs to `stub.go` in P0-2, but the corresponding CGO implementations in `clib.go` are not added until P1-3. The `!cgo` build will compile correctly with the stubs. The CGO build (used for integration testing) will fail with "undefined: backend.StartHeartbeat" if P0-2 is tested before P1-3. - -**Fix:** Add a note: "The CGO build will fail to compile after P0-2 until P1-3 adds `StartHeartbeat` and `SetHeartbeatInterval` to `clib.go`. Implement P0-2 stub additions and P1-3 `clib.go` additions in the same commit, or accept a temporary CGO build break between phases." - -### ARCH-4 — `OnHostUpdated` behavioral change has no RED test written first (HIGH) - -**Location:** P0-1, "OnHostUpdated fix" - -**Issue:** The plan changes `handler.go:27` from full-overwrite to partial merge — a behavioral change to existing code. There are zero tests for `DefaultHandler` in the entire test suite. CLAUDE.md mandates TDD: "Write a failing test first." A wrong field classification in the partial merge (e.g., accidentally preserving a worker field that should be updated) will silently corrupt host state with no test catching it. - -**Fix:** Before implementing the `OnHostUpdated` change, add `backend/handler_test.go` with: -- A test that proves the current full-overwrite behavior (RED for the new code) -- Tests for `OnHostConfigUpdated` partial merge: config fields update, worker fields preserved -- Tests for `OnHostUpdated` partial merge: worker fields update, config fields preserved -- Tests for `OnClusterUpdated` partial merge - -Use `store.InitStores()` for store reset between test cases. - -### ARCH-5 — Pure conversion functions have no unit tests specified (HIGH) - -**Location:** P0-1, "backend/convert_pure.go" - -**Issue:** `rawHostConfigToModel` and `rawClusterToModel` are placed in `convert_pure.go` (no CGO, fully testable) but the plan's Verification section specifies only post-hoc integration checks (start server, hit endpoints). The `convert_test.go` file already tests `rawJobToModel` and `rawWorkerToModel` with table-driven tests — the same pattern must be applied here per TDD rules. - -**Fix:** Add to the P0-1 implementation instructions: "Before implementing `rawHostConfigToModel` and `rawClusterToModel`, add table-driven tests in `backend/convert_test.go` covering: nil/empty string fields, zero integer fields (MaxSlot=0, HeartbeatInterval=0), normal values." - -### ARCH-6 — First-startup host state appears "OK" with zero worker fields (HIGH) - -**Location:** P0-1, "Partial merge semantics" - -**Issue:** After P0-1, the config push fires and creates host entries with `HostModel`, `HostType`, `MaxSlot` set but all worker-sourced fields (`HostStatus`, `MaxMem`, `NumRun`, etc.) at zero. `HostStateStr` in `models/hosts.go:20` maps `state=0` to `"OK"`. A `GET /xce/v1/hosts` call in the window before any worker has checked in will return hosts showing status `"OK"` with 0 CPUs and 0 memory. Operators and monitoring dashboards will see misleading data. - -**Fix (minimal, non-breaking):** Change `HostStateStr(0)` from `"OK"` to `"UNKNOWN"` or `"PENDING"`. This is a one-line change in `models/hosts.go` that accurately reflects the not-yet-reported state. Alternatively, add a `WorkerDataReceived bool` field to `HostInfo` set by `OnHostUpdated`. - -### ARCH-7 — `meson.build` custom_target block is not specified (MEDIUM) - -**Location:** P1-2, "Build Integration" - -**Issue:** The plan says "add `xce_select.peg` to that explicit list." The actual `meson.build` pattern requires a full `custom_target` block mirroring the existing `xce_resreq_parser` block — the packcc tool, input/output filenames, command invocation — followed by adding `xce_select_parser[0]` to `libxce_src`. Simply adding the filename to `libxce_src` will fail because meson does not auto-run packcc on `.peg` files. - -**Fix:** The plan must include the complete `custom_target` block for `xce_select.peg`. - -### ARCH-8 — Heartbeat test uses `time.Sleep` despite plan prohibiting it (MEDIUM) - -**Location:** Verification section, item 5 - -**Issue:** The plan states "The test must not depend on real time" then immediately provides a test using `time.Sleep(3500ms)`. This is a 3.5-second wall-clock delay per test run, and the pass/fail boundary (`n < 2 || n > 5`) will be flaky on loaded CI systems. - -**Fix:** Expose the ticker as injectable: `StartHeartbeat(ctx, tickCh <-chan time.Time)` where production code passes `time.NewTicker(...).C` and tests pass a manually-driven `chan time.Time`. The test sends exactly N ticks and asserts the counter equals N — zero wall-clock time required. - -### ARCH-9 — No code-level TODO for O(H) parse-per-call bottleneck (MEDIUM) - -**Location:** P1-2, "Performance" note - -**Issue:** The plan acknowledges that `EvalSelectForHost` calls `parse_select` once per host (O(H) parse calls per request) and says "do not over-engineer." The optimization path is described only in the design document — future developers reading the code will not see it. - -**Fix:** Add this comment in `EvalSelectForHost` in `clib.go`: -```go -// TODO(perf): parse_select is called once per host. For large clusters, pre-parse -// the expression once and pass the *C.xce_select_t to a batch evaluator. -// See EvalSelectForHostParsed design note in apiserver-backend-enhancement-plan.md. -``` - -### ARCH-10 — Stale decommissioned hosts have no API signal (MEDIUM) - -**Location:** P0-1, "Partial merge semantics" — host deletion paragraph - -**Issue:** Hosts removed from the cluster configuration remain in `store.Hosts` indefinitely. There is no `LastSeenAt` field, no stale flag, no way for operators to distinguish a decommissioned host from a healthy-but-unreachable one. The plan defers TTL, but adds no groundwork for it. - -**Fix:** Add `LastConfigSeenAt time.Time` and `LastWorkerSeenAt time.Time` fields to `HostInfo`. Set them in `OnHostConfigUpdated` and `OnHostUpdated` respectively. These fields cost nothing in correctness and provide the data source for a future TTL implementation without requiring a model change later. - ---- - -## Consensus Summary - -### Issues Requiring Plan Correction Before Implementation - -| # | Finding | Severity | Phase | -|---|---------|----------|-------| -| CGO-1 | `unsafe.Slice` nil pointer — `cClusterConfHostConfigs` | HIGH | P0-1 | -| CGO-2 | `unsafe.Slice` nil pointer — `handleNotifyData` | HIGH | P1-1 | -| SEC-1 | `recover()` does not catch C SIGSEGV — stated protection is false | HIGH | P1-2 | -| SEC-2 | `allFlag` package-level data race — concurrent requests corrupt state | HIGH | P0-2 | -| ARCH-1 | `cResourceToModel` naming collision — compile error | HIGH | P0-1 | -| ARCH-2 | `host_admin` role does not exist in `rbac.yaml` | HIGH | P0-2 | -| ARCH-3 | P0-2 stubs cause CGO link failure before P1-3 | HIGH | P0-2 | -| ARCH-4 | `OnHostUpdated` change has no RED test (TDD violation) | HIGH | P0-1 | -| ARCH-5 | `rawHostConfigToModel`/`rawClusterToModel` have no unit tests specified | HIGH | P0-1 | -| ARCH-6 | Zero worker fields at first startup show as `"OK"` status | HIGH | P0-1 | - -### Issues Requiring Plan Clarification - -| # | Finding | Severity | Phase | -|---|---------|----------|-------| -| SEC-3 | No Go-side range check on `nrows` before `unsafe.Slice` in push handler | MEDIUM | P1-1 | -| SEC-4 | PEG parser packrat requirement not specified (DoS risk) | MEDIUM | P1-2 | -| ARCH-7 | `meson.build` custom_target block missing from plan | MEDIUM | P1-2 | -| ARCH-8 | Heartbeat test uses `time.Sleep` despite plan prohibiting it | MEDIUM | P1-3 | -| ARCH-9 | No code-level TODO for O(H) parse-per-call bottleneck | MEDIUM | P1-2 | -| ARCH-10 | Stale decommissioned hosts have no API signal | MEDIUM | P0-1 | -| CGO-3 | `StartHeartbeat` goroutine cannot be interrupted during CGO call | MEDIUM | P1-3 | -| SEC-5 | C error codes leak to HTTP response body | LOW | P0-2 | - -### Confirmed Strengths (all reviewers agreed) - -- Partial merge semantics are correctly designed: field ownership lists are explicit and the read-then-write pattern is sound for the single-threaded push handler. -- `OPCode_notify` placed at the top-level switch (not inside `handlePush`) is architecturally correct. -- `cgo.Handle` usage for the select callback context is the right CGO approach. -- `RegisterToBackend` being synchronous ensures heartbeat starts with the correct interval. -- PEG grammar placed in `libxce` (not Go layer) is correct for scheduler reuse. -- The two-step extraction (`xce_request_body` then `xce_notify_data_ptr`) is now correct in the plan. - -### Items Confirmed Not Issues - -- `req.body_which` and `nd.event` are plain struct fields, CGO-accessible. ✓ -- `(*[0]byte)(C.xce_select_get_attr)` is the correct CGO function pointer idiom. ✓ -- `C.uintptr_t(h)` for cgo.Handle is an integer cast (not pointer), go-vet clean. ✓ -- `host:view` for all authenticated users is intentional HPC design. ✓ -- `xcecli_hostctrl` blocking CGO: consistent with existing queuectrl pattern, local socket. ✓ - ---- - -## Prior Review Summary (2026-04-15) - -The prior adversarial + feasibility review identified the following issues, all of which are **confirmed fixed** in the current plan: - -| Issue | Fix Confirmed | -|-------|---------------| -| `handleNotifyData()` used wrong function to extract body | Fixed: plan now uses `xce_request_body(req)` first | -| `xce_val_t.which` referenced as `.type` | Fixed: plan uses `val.which` throughout | -| `handleUpdate()` union field accessed directly | Fixed: plan explicitly states OPCode_update is NOT used by apiserver | -| P1-2 CGO map-as-context was undefined behavior | Fixed: plan uses `cgo.Handle` | -| `stub.go` stubs omitted for `!cgo` builds | Fixed: comprehensive stub section added | -| `helper.c` missing from file list | Fixed: included with `Request_body_hostctrlmsg` case | -| `free_select()` / `kill_resreq()` linkage — memory leak | Fixed: plan shows both `free_select` + `FREEUP(resreq->select)` | -| Heartbeat interval not reconfigurable after start | Fixed: `SetHeartbeatInterval` + `ticker.Reset` per tick | - ---- - -*To incorporate this feedback: update `apiserver-backend-enhancement-plan.md` addressing all HIGH-severity items before implementation begins. MEDIUM items should be resolved before the first PR is opened.* diff --git a/src/docs/config-replication-gap-analysis.md b/src/docs/config-replication-gap-analysis.md deleted file mode 100644 index 66b8997..0000000 --- a/src/docs/config-replication-gap-analysis.md +++ /dev/null @@ -1,252 +0,0 @@ -# Config Replication — Gap Analysis: Design vs Implementation - -> **Date**: 2026-05-20 -> **Design doc**: `config-replication-design.md` -> **Implementation status**: `config-replication-impl-status.md` -> **Branch**: `persistent_ha` -> **Scope**: Validates what is implemented vs what the design specifies. - ---- - -## Executive Summary - -The infrastructure is largely in place: schema, struct fields, storage functions, election probing, -and the Phase 1 opcode dispatch all exist. However **the core wire protocol is not functional**: -both the standby fetch (`do_one_config_fetch`) and the primary's reply payload -(`handle_config_request`) are explicitly stubbed pending "Task 11" — Cap'n Proto `Data`-typed -field extraction shims. Additionally, a path inconsistency bug affects `conf_save_config()`, and -the push timeout design is not implemented. - -**Phase 1 (pull-only replication)**: Infrastructure exists; wire protocol is a no-op stub. -**Phase 2 (remote push)**: Gate compiles but returns `-ENOSYS`; functional logic exists in `do_upgrade_config_with_bytes()` but is not wired. - ---- - -## Gap 1 — CRITICAL: `do_one_config_fetch()` is a no-op stub - -**Design (§5.5):** The standby connects to the primary over a standalone SSL socket (before -Phase 2 / iomgr), sends `OP_replConfig` with its saved version tag, receives `ReplConfigReply` -with the full config bytes + SHA-256, verifies integrity, writes to `conf/`, and updates -`conf/current`. - -**Code (`config_repl.c:674–683`):** -```c -static int do_one_config_fetch(cluster_t *c, const char *host, uint32_t port, - uint64_t our_tag) -{ - (void)c; (void)host; (void)port; (void)our_tag; - /* Task 11: wire full capnp encode/decode over standalone SSL socket */ - return -ENOSYS; -} -``` - -**Impact:** All 20 retry attempts in `fetch_config_from_primary()` fail immediately with -`-ENOSYS` (~47 seconds of log spam), then fall back to the locally saved config. A brand-new -standby with no saved config will FATAL with "no saved config" error. - -**Root cause:** Task 11 (Cap'n Proto `Data`-type field extraction shims for the standalone SSL path) is not yet done. - ---- - -## Gap 2 — CRITICAL: `handle_config_request()` sends NULL bytes and SHA-256 - -**Design (§5.4):** When the standby's tag differs from the primary's, the primary sends back -`ReplConfigReply { up_to_date=false, versionTag=..., sha256=<32 bytes>, bytes= }`. - -**Code (`config_repl.c:650–655`):** -```c -/* sha256 and bytes are xce_data_t* — raw-byte encoding is wired in Task 11. - * For now set to NULL so encode_Data_ptr emits capn_null pointers. */ -rmsg->sha256 = NULL; -rmsg->bytes = NULL; -``` - -**Impact:** Even if the standby's SSL connection were wired, the primary would reply with an -incomplete message. The standby would receive a tag but no config payload. - ---- - -## Gap 3 — HIGH: `handle_upgrade_config()` always returns `-ENOSYS` - -**Design (§6.4):** When `CONF_ENABLE_UPGRADE_CONFIG=1`, `handle_upgrade_config()` validates -SHA-256, decodes Cap'n Proto, increments generation, saves to disk, fans out to standbys, then -signals restart. The full logic exists in `do_upgrade_config_with_bytes()`. - -**Code (`config_repl.c:1031–1048`):** -```c -#if CONF_ENABLE_UPGRADE_CONFIG -int handle_upgrade_config(cluster_t *c, endpoint_t *ep, xce_request_t *req) -{ - /* Task 11 dependency: ... until Task 11 lands this handler rejects all - * upgrade requests with -ENOSYS even when CONF_ENABLE_UPGRADE_CONFIG=1. */ - send_upgrade_error(ep, req, c, - "OP_upgradeConfig byte extraction requires Task 11 ..."); - return -ENOSYS; -} -``` - -**Impact:** Phase 2 is completely non-functional even when the compile-time gate is enabled. -The `do_upgrade_config_with_bytes()` helper containing the real logic exists but is not called. - ---- - -## Gap 4 — MEDIUM (latent bug): `conf_save_config()` uses wrong directory path - -**Design (§3.1):** Config files live at `${workdir}/${name}/conf/cluster.bin.`. - -**Code mismatch:** - -| Function | Effective path | Correct? | -|---|---|---| -| `load_primary_config()` | builds `conf_dir = workdir/name`, reads `workdir/name/conf/current` | ✓ | -| `fetch_config_from_primary()` | builds `conf_dir = workdir/name`, calls helpers correctly | ✓ | -| `conf_save_config()` | `make_conf_dir(myconf->workdir, ...)` → `workdir/conf` (no `name`) | ✗ | -| `conf_trim_old_versions()` (called from save) | same `myconf->workdir` → `workdir/conf` | ✗ | - -**`conf_save_config()` (line 235):** -```c -make_conf_dir(myconf->workdir, conf_dir, sizeof(conf_dir)); -// → conf_dir = "/var/xce/conf" (missing "/ctrl01") -``` - -**`load_primary_config()` (line 75–76):** -```c -snprintf(conf_dir, sizeof(conf_dir), "%s/%s", myconf->workdir, myconf->name); -// → conf_dir = "/var/xce/ctrl01" (correct) -``` - -**Status:** Currently latent because `handle_upgrade_config()` returns `-ENOSYS` before calling -`do_upgrade_config_with_bytes()` → `conf_save_config()`. Will trigger as a real bug when Task 11 -wires the upgrade path. - -**Fix:** Change `conf_save_config()` to accept an `effective_dir` parameter (or construct -`workdir/name` internally from `myconf->workdir` + `myconf->name`), consistent with how -`load_primary_config()` and `fetch_config_from_primary()` build the path. - ---- - -## Gap 5 — MEDIUM: No aggregate timeout in `push_config_to_standbys()` - -**Design (§6.3):** "The primary waits at most `CONF_PUSH_TIMEOUT_MS` (default 500 ms) **total** -for all ACKs. This bounds the pre-restart delay to a single timeout period regardless of standby -count." - -**Code (`config_repl.c:840–858`):** -```c -for (int i = 0; i < n; i++) { - if (!ctxs[i].started) continue; - pthread_join(threads[i], NULL); // ← blocks indefinitely per thread - if (ctxs[i].acked) acked++; -} -``` - -`CONF_PUSH_TIMEOUT_MS` is defined in the header (line 26) but is **never used** in this function. -The design calls for `wait_all_with_timeout(push_threads, n_standbys, CONF_PUSH_TIMEOUT_MS)` which -is not implemented. - -**Impact:** If any standby hangs during push, the primary could block indefinitely before -restarting. The `CONF_PUSH_TIMEOUT_MS` safety bound is missing. - ---- - -## Gap 6 — MEDIUM: `start_heartbeat_listener()` is a stub - -**Design (§9.0):** A dedicated heartbeat listener thread starts immediately after -`am_i_primary()` determines the node is primary. It allows lower-priority candidates to detect -the primary during Phase 2 initialization (before iomgr is up). - -**Code (`ha.c:356–365`):** -```c -void start_heartbeat_listener(cluster_t *c) -{ - (void)c; - /* Heartbeat listener stub — full implementation in cluster.c Task 7 */ -} -void stop_heartbeat_listener(cluster_t *c) { (void)c; } -``` - -**Impact:** `impl-status.md` notes: "simultaneous-boot symmetry relies on priority step only." -This means the §9.0 guarantee — that a lower-priority self-declared primary can receive a -heartbeat from the higher-priority true primary during Phase 2 init — is not enforced. -In practice, the priority-based step delay (500ms gap) makes simultaneous-boot split-brain -unlikely, but not impossible. - ---- - -## Gap 7 — LOW: WAL replay routing helpers (`resolve_queue_or_lost_and_found()` etc.) not implemented - -**Design (§6.5):** Three helpers for routing orphaned WAL records: -- `resolve_queue_or_lost_and_found(cluster_t *c, uint32_t queue_id)` -- `resolve_host_or_lost_and_found()` -- `clear_resource_and_pend()` - -These are declared in §12 (Files Changed → `config_repl.c`) and are supposed to be called from -`apply_wal_entry()` in `persist.c`. - -**Code:** Not found in `config_repl.c` or `persist.c`. `create_lost_and_found()` exists and -creates the synthetic queue/host, but the WAL apply path does not use them — unknown queue/host -IDs during `persist_recover()` are not routed to `lost_and_found`. - -**Impact:** Config upgrade (removing a queue/host) + WAL replay would hit an unknown-ID path -that is not yet gracefully handled. Currently not a production risk since `OP_upgradeConfig` is -gated, but a prerequisite for safe queue/host removal. - ---- - -## Gap 8 — LOW: Certificate expiry warning (§11.1) not implemented - -**Design (§11.1):** At startup (after `create_ssl_context`), check `X509_get0_notAfter()` and -WARN if the certificate expires within `CERT_WARN_DAYS` (30 days). - -**Code:** `CERT_WARN_DAYS 30` is defined in `config_repl.h:30` but no code reads it or calls -`X509_get0_notAfter()`. - ---- - -## Gap 9 — LOW: `sd_notify()` not implemented - -**Design (§11.1):** The systemd unit file specifies `Type=notify`, which requires the controller -to call `sd_notify(0, "READY=1")` after Phase 2 completes. - -**Code:** No `sd_notify()` call found in any controller source file. - ---- - -## Summary Table - -| # | Gap | Severity | Currently Reachable? | Blocks | -|---|---|---|---|---| -| 1 | `do_one_config_fetch()` stub | **CRITICAL** | Yes (standby startup) | Standby config fetch | -| 2 | `handle_config_request()` null payload | **CRITICAL** | Yes (any replConfig request) | Primary config reply | -| 3 | `handle_upgrade_config()` -ENOSYS | **HIGH** | Yes (when gate=1) | Phase 2 entirely | -| 4 | `conf_save_config()` wrong path | **MEDIUM** | No (latent; blocked by Gap 3) | Config upgrade restart cycle | -| 5 | No push timeout | **MEDIUM** | No (blocked by Gap 3) | Upgrade restart latency | -| 6 | Heartbeat listener stub | **MEDIUM** | Yes | Simultaneous-boot robustness | -| 7 | WAL routing helpers missing | **LOW** | No (blocked by Gate=0) | Safe config upgrade | -| 8 | Cert expiry warning missing | **LOW** | No (operational only) | Observability | -| 9 | sd_notify() missing | **LOW** | No (operational only) | Systemd integration | - ---- - -## Root Cause: Task 11 Dependency - -Gaps 1, 2, and 3 share a common root cause: **"Task 11"** — Cap'n Proto `Data`-typed field -extraction shims in the typemap layer. The design's `ReplConfigReply.sha256` and -`ReplConfigReply.bytes` (and the corresponding request fields for `OP_upgradeConfig`) are typed as -`xce_data_t*` (a discriminated cluster-data union) in the current typemap. Extracting raw bytes -from them requires shims that don't yet exist. - -Completing Task 11 would unblock: -- `handle_config_request()` → send actual bytes -- `do_one_config_fetch()` → receive and decode config -- `handle_upgrade_config()` → extract input bytes from request - ---- - -## Recommended Fix Order - -1. **Task 11 (typemap Data shims)** — unblocks Gaps 1, 2, 3 simultaneously -2. **Gap 4 fix** (`conf_save_config()` path) — fix before Task 11 ships to avoid silent bug -3. **Gap 5 fix** (push timeout) — add `wait_all_with_timeout()` helper alongside Task 11 -4. **Gap 6** (heartbeat listener) — implement to complete §9.0 simultaneous-boot guarantee -5. **Gap 7** (WAL routing helpers) — required before enabling `CONF_ENABLE_UPGRADE_CONFIG=1` diff --git a/src/docs/p1-2-host-select.md b/src/docs/p1-2-host-select.md index d1a0f16..1b3954e 100644 --- a/src/docs/p1-2-host-select.md +++ b/src/docs/p1-2-host-select.md @@ -1,71 +1,52 @@ # P1-2: Host Resource Requirement Select — Investigation ## Status -- [>] Under investigation (moved from apiserver-backend-tasks.md) +- **C layer (P1-2a): COMPLETE** — `eval_select_simple` wired in `xce_select.c` + (PEG grammar → AST → CSE, memoized eval). Scheduler integration (Phase 6) done. + See `src/docs/resreq-ast-cse-design.md` for architecture reference. +- **Go bridge (P1-2b): PENDING** — `EvalSelectForHost` remains a stub returning + `errNoCGO`. CGO boundary, resource value lookup from in-memory store, and + `FilterHostByResReqSelect` are still to implement. --- ## Background -The `select` field in an LSF-style resource requirement string (e.g. `select[mem>4096 && type==X86_64]`) -filters candidate hosts before slot allocation. Currently `EvalSelectForHost` is a no-CGO stub that -always returns `errNoCGO`. +The `select` field in an LSF-style resource requirement string (e.g. +`select[mem>4096 && type==X86_64]`) filters candidate hosts before slot +allocation. Currently `EvalSelectForHost` is a no-CGO stub that always returns +`errNoCGO`. The full feature requires two layers: -1. **C parser + evaluator** — parse the boolean select expression into an AST and evaluate it against - a host's resource values. -2. **Go bridge** — call the C evaluator via CGO and wire it into `FilterHostByResReqSelect` in the - controllers layer. +1. **C parser + evaluator** — parse the boolean select expression into an + AST and evaluate it against a host's resource values. +2. **Go bridge** — call the C evaluator via CGO and wire it into + `FilterHostByResReqSelect` in the controllers layer. --- ## Sub-tasks -### #11 P1-2a: C select expression parser (PEG + eval) +### #11 P1-2a: C select expression parser (PEG + eval) ✓ COMPLETE + +**Files implemented:** +- `include/resreq.h` — expression-tree types, enums, `extern` declarations. +- `lib/xce_select.peg` — PEG grammar for select boolean expressions. +- `lib/xce_select.c` — `parse_select()`, `eval_select_simple()`, CSE tree. +- `lib/meson.build` — `xce_select.peg` in build. + +### #12 P1-2b: Go EvalSelectForHost + FilterHostByResReqSelect (remaining) **Files to touch:** -- `include/resreq.h` — Replace empty `xce_resreq_select_` stub with expression-tree types, enums, - and `extern` declarations for `parse_select`, `eval_select`, `free_select`. -- `lib/xce_select.peg` — New PEG grammar for select boolean expressions (right-recursive, handles - `&&`, `||`, `!`, comparison operators, numeric literals, string literals, resource names). -- `lib/resreq.c` — Implement `parse_select()`, `eval_select()`, `free_select()`; update - `kill_primary_resreq()` to call `free_select()`. -- `lib/meson.build` — Add `xce_select.peg` to explicit source list so the PEG tool generates C. -- `lib/testsuite/` — TDD tests for parse/eval before implementing. - -**Open questions:** -- Which PEG library is already available in the Nix/Meson build? (`peg`, `lemon`, `re2c`?) -- Exact grammar for comparison operators — LSF allows `mem > 4096`, `type == X86_64`, `swp >= 0`. - Need to confirm all supported operators and value types. -- Does `eval_select` receive a flat key-value map of resource values, or a pointer to the full - `xce_host_t` struct? -- Error reporting strategy — return a bool+error-string, or a tri-state (true/false/parse-error)? - -### #12 P1-2b: Go EvalSelectForHost + FilterHostByResReqSelect (blocked by #11) - -**Files to touch:** -- `backend/clib.go` — Implement `EvalSelectForHost(hostname, selectExpr string) error` using - `cgo.Handle` for callback context; add `#include "resreq.h"`, extern C declarations, - `xce_select_destroy` helper. +- `backend/clib.go` — Implement `EvalSelectForHost(hostname, selectExpr string) error` + using `cgo.Handle` for callback context; add `#include "resreq.h"`, extern C + declarations, `xce_select_destroy` helper. - `controllers/hosts.go` — Implement `FilterHostByResReqSelect(hosts []models.HostInfo, expr string)`, update `preCheckHostRequest()` limit from 4094 → 1024 bytes. **Open questions:** -- Does `EvalSelectForHost` need to look up live resource values from the in-memory store, or are - values passed in directly by the C layer? -- `cgo.Handle` usage pattern — confirm whether a per-call handle or a session-level handle is needed. +- Does `EvalSelectForHost` look up live resource values from the in-memory + store, or are values passed directly from C? +- `cgo.Handle` usage pattern — per-call or session-level? - Input validation: max expression length (1024 bytes), allowed characters. - ---- - -## Investigation Checklist - -- [ ] Survey existing PEG tooling in the Meson/Nix build environment. -- [ ] Read `include/resreq.h` current state to understand `xce_resreq_select_` stub. -- [ ] Trace how `kill_primary_resreq()` works today and where `free_select()` must be called. -- [ ] Confirm resource value structure passed to `eval_select`. -- [ ] Confirm LSF select grammar spec (operators, value types, nesting depth). -- [ ] Prototype PEG grammar for a subset (numeric comparisons only) and get it compiling. -- [ ] Decide error propagation strategy across the CGO boundary. -- [ ] Write TDD tests for C parser before any implementation. diff --git a/src/docs/phase6-audit.md b/src/docs/phase6-audit.md deleted file mode 100644 index 1ab0e98..0000000 --- a/src/docs/phase6-audit.md +++ /dev/null @@ -1,21 +0,0 @@ -# Phase 6 Pre-Audit: Single-Threaded Invariant and Stub Locations - -## Audit Results - -- **sched_meet_host_selection stub confirmed** at `src/scheduler/src/resource.c:127-131` - - Declaration: `src/scheduler/include/scheduler.h:111` - - Call site: `src/scheduler/src/resource.c:368` (within sched_try_alloc_on_host_) - - Stub body: returns 1 unconditionally - -- **Allocator-thread-only invariant confirmed**: Single `while(1)` loop in `src/scheduler/src/main.c:119` - - `sched_begin_session()` at line 121 - - `sched_go()` at line 122 - - `sched_end_session()` at line 161 - - All three calls executed sequentially in the same thread context - -- **eval_select_simple signature confirmed**: `int eval_select_simple(const xce_select_node_t* root, const host_eval_ctx_t* host)` - - Declaration: `src/include/resreq.h:110-111` - - Definition: `src/lib/xce_select.c:558` - - Returns: 1 (match), 0 (no match), negative (error) - -No unexpected references to `sched_meet_host_selection`, `eval_select`, `alloc_thread`, or `sched_session` found in scheduler source. diff --git a/src/docs/phase6-scheduler-integration-plan.md b/src/docs/phase6-scheduler-integration-plan.md deleted file mode 100644 index a0dd51c..0000000 --- a/src/docs/phase6-scheduler-integration-plan.md +++ /dev/null @@ -1,1284 +0,0 @@ -# Phase 6 — Scheduler Integration Implementation Plan - -> **Status: ✓ COMPLETE — 2026-04-30 — 10/10 scheduler tests pass** | branch: `merge_api_server` - -**Goal:** Wire the select-expression AST evaluator (`eval_select_simple`) into the scheduler so that `sched_meet_host_selection` filters hosts by actual job select expressions instead of always returning 1. - -**Architecture:** Export GC mark primitives from `libxce` to break the circular dependency; add `_Atomic` GC-predicate fields to `xce_scheduler_t`; implement `build_host_eval_ctx` to project `xce_sched_worker_t.resvals` into `host_eval_ctx_t`; call `eval_select_simple` in the stub replacement; drive the full mark→sweep GC from `sched_end_session`. - -**Tech Stack:** C99, Unity test framework, Meson/Ninja build, `nix develop` environment, `libxce` (`src/lib`), scheduler (`src/scheduler`) - ---- - -## File Map - -| File | Change | -|------|--------| -| `src/lib/xce_select.c` | Export `gc_mark_select_tree`; add `gc_clear_marks`; remove clear from `gc_sweep`; remove Phase 6 guard; add `sel_alloc_thread_id` + thread checks | -| `src/include/resreq.h` | Declare `gc_mark_select_tree`, `gc_clear_marks`, `sel_register_alloc_thread` | -| `src/lib/testsuite/test_select.c` | Prefix every `gc_sweep_select_nodes(NULL,0)` call with `gc_clear_marks()` | -| `src/scheduler/include/scheduler.h` | Add `_Atomic int session_active/eval_in_progress/staging_merge_complete` to `xce_scheduler_t`; declare `sched_session_active/sched_eval_in_progress/staging_merge_complete` | -| `src/scheduler/src/scheduler.c` | Add predicate static helpers; wire `sel_optimize_set(1)` in `sched_init`; drive GC from `sched_end_session` with atomic fence | -| `src/scheduler/src/resource.c` | Add `build_host_eval_ctx`; replace `sched_meet_host_selection` stub | -| `src/scheduler/testsuite/meson.build` | Link `resource.c` + `scheduler.c` for integration tests | -| `src/scheduler/testsuite/test.c` | Add `test_meet_host_selection` integration test | - ---- - -## Task 1: Pre-audit — confirm single-threaded invariant and stub locations (6-1, 6-2) - -**Files:** -- Read: `src/scheduler/src/resource.c` -- Read: `src/scheduler/src/main.c` - -- [x] **Step 1: Run the blocking-gate grep** - -```bash -cd /workspace -grep -rn 'sched_meet_host_selection\|meet_host_selection' src/scheduler/ src/lib/ -grep -rn 'eval_select\|alloc_thread\|sched_session' src/scheduler/src/ -``` - -Expected: `sched_meet_host_selection` appears in exactly 3 locations — `scheduler.h` (decl), `resource.c` (stub def), `resource.c` (call site at `sched_try_alloc_on_host_`). No other call sites. - -- [x] **Step 2: Confirm allocator-thread-only invariant** - -```bash -grep -n 'sched_begin_session\|sched_end_session\|sched_go' src/scheduler/src/main.c -``` - -Expected: all three called from the same `while(1)` loop in `main`. Document result: "confirmed single-threaded allocator loop in main.c lines ~119-168". - -- [x] **Step 3: Confirm `eval_select_simple` signature** - -```bash -grep -n 'eval_select_simple' src/include/resreq.h src/lib/xce_select.c -``` - -Expected: `int eval_select_simple(const xce_select_node_t* root, const host_eval_ctx_t* host)` — returns 1 (match), 0 (no match), negative (error). - -- [x] **Step 4: Commit audit result** - -```bash -git add -p # no code changes -git commit -m "chore: phase 6 pre-audit — allocator single-threaded confirmed, stub at resource.c:sched_meet_host_selection" -``` - ---- - -## Task 2: Export GC mark primitives — split gc_sweep_select_nodes (6-8 prerequisite) - -The circular dependency between `xce_select.c` (libxce) and `sched/types.h` (scheduler) means the GC mark pass cannot live inside `gc_sweep_select_nodes`. Solution: export `gc_clear_marks` and `gc_mark_select_tree` so the **scheduler** owns the mark phase. - -`gc_sweep_select_nodes` currently clears marks internally before sweeping. After this task it only sweeps — callers must call `gc_clear_marks()` first. The Phase 6 guard (`if (live_jobs != NULL && njobs > 0) return;`) is removed. - -**Files:** -- Modify: `src/lib/xce_select.c` -- Modify: `src/include/resreq.h` -- Modify: `src/lib/testsuite/test_select.c` - -- [x] **Step 1: Write the failing test** - -In `src/lib/testsuite/test_select.c`, add after the existing GC tests (around line 800): - -```c -static void -test_gc_clear_marks_exported(void) -{ - /* After this call, all nodes in the intern table must have gc_mark == 0. - * We verify by immediately calling gc_sweep (which only sweeps unmarked - * nodes), expecting no crash and consistent node count. */ - sel_optimize_test_reset(); - sel_optimize_set(1); - xstring_table_init(64 * 1024); - sel_node_table_init(); - - /* intern two nodes */ - xce_select_node_t* n1 = makeSelectNode(SEL_NUM, (uintptr_t)1.0, 0); - xce_select_node_t* n2 = makeSelectNode(SEL_NUM, (uintptr_t)2.0, 0); - TEST_ASSERT_NOT_NULL(n1); - TEST_ASSERT_NOT_NULL(n2); - - /* mark n1 manually */ - n1->gc_mark = 1; - - /* clear should reset n1->gc_mark */ - gc_clear_marks(); - TEST_ASSERT_EQUAL_INT(0, n1->gc_mark); - - /* mark n2 so sweep preserves it; n1 (unmarked) is swept */ - gc_mark_select_tree(n2); - TEST_ASSERT_EQUAL_INT(1, n2->gc_mark); - - gc_sweep_select_nodes(NULL, 0); - /* n1 swept — n2 still alive */ - TEST_ASSERT_EQUAL_INT(1, n2->gc_mark); /* mark survives sweep */ - - sel_node_table_fini(); - sel_optimize_test_reset(); -} -``` - -In the `main` function of `test_select.c`, register the test: - -```c -TEST(test_gc_clear_marks_exported); -``` - -- [x] **Step 2: Run test to verify it fails** - -```bash -nix develop --command bash -c "cd /workspace/src && meson setup build --wipe 2>/dev/null || true && ninja -C build lib/testsuite/xce_test 2>&1 | tail -30" -``` - -Expected: compile error — `gc_clear_marks` and `gc_mark_select_tree` undeclared. - -- [x] **Step 3: Add declarations to resreq.h** - -In `src/include/resreq.h`, after the `gc_sweep_select_nodes` declaration (line ~121): - -```c -/* GC mark primitives — called by the scheduler to implement the mark phase. - * Call order: gc_clear_marks() → gc_mark_select_tree(root) per live node - * → gc_sweep_select_nodes(NULL, 0) */ -extern void gc_clear_marks(void); -extern void gc_mark_select_tree(xce_select_node_t* node); -``` - -- [x] **Step 4: Implement gc_clear_marks and gc_mark_select_tree in xce_select.c** - -In `src/lib/xce_select.c`, locate the `gc_mark_tree` function at line ~805: - -```c -static void __attribute__((unused)) gc_mark_tree(xce_select_node_t* node) -``` - -Replace with (non-static, renamed): - -```c -void gc_mark_select_tree(xce_select_node_t* node) -{ - if (node == NULL || node->gc_mark) return; - node->gc_mark = 1; - switch (node->type) { - case SEL_RESNAME: case SEL_NUM: case SEL_STR: - case SEL_ANY: case SEL_TRUE: case SEL_FALSE: - break; - case SEL_NOT: - gc_mark_select_tree(node->u.operand); - break; - default: - gc_mark_select_tree(node->u.binop.left); - gc_mark_select_tree(node->u.binop.right); - break; - } -} -``` - -Above that, add `gc_clear_marks`: - -```c -void gc_clear_marks(void) -{ - if (sel_node_table.table == NULL) return; - int caps = sel_node_table.nodes.caps; - for (int i = 0; i < caps; i++) { - xce_select_node_t* node = - (xce_select_node_t*)zarray_get(&sel_node_table.nodes, i); - if (node == NULL) continue; - node->gc_mark = 0; - } -} -``` - -- [x] **Step 5: Modify gc_sweep_select_nodes — remove clear loop and Phase 6 guard** - -In `src/lib/xce_select.c`, in `gc_sweep_select_nodes` (line ~826): - -Remove the Phase 6 guard block: -```c - if (live_jobs != NULL && njobs > 0) { - return; - } -``` - -Remove the clear loop (step 1, lines ~841-852): -```c - /* 1. Clear all gc_mark bits ... */ - for (int i = 0; i < caps; i++) { - xce_select_node_t* node = - (xce_select_node_t*)zarray_get(&sel_node_table.nodes, i); - if (node == NULL) continue; - node->gc_mark = 0; - } -``` - -The function now starts directly with the `int caps = sel_node_table.nodes.caps;` line and the sweep loop. - -- [x] **Step 6: Update test_select.c — prefix all gc_sweep_select_nodes(NULL,0) calls** - -```bash -grep -n 'gc_sweep_select_nodes(NULL, 0)' src/lib/testsuite/test_select.c -``` - -For every occurrence, prepend `gc_clear_marks();` on the line before. There should be 4 occurrences. Example — each: - -```c -/* before */ -gc_sweep_select_nodes(NULL, 0); - -/* after */ -gc_clear_marks(); -gc_sweep_select_nodes(NULL, 0); -``` - -- [x] **Step 7: Build and run tests** - -```bash -nix develop --command bash -c "cd /workspace/src && ninja -C build && build/lib/testsuite/xce_test -t test_gc_clear_marks_exported" -``` - -Expected: `test_gc_clear_marks_exported` PASS. Run full suite: - -```bash -nix develop --command bash -c "cd /workspace/src && build/lib/testsuite/xce_test" -``` - -Expected: all GC tests PASS. - -- [x] **Step 8: Commit** - -```bash -git add src/lib/xce_select.c src/include/resreq.h src/lib/testsuite/test_select.c -git commit -m "feat: export gc_clear_marks + gc_mark_select_tree; remove clear from gc_sweep" -``` - ---- - -## Task 3: Add _Atomic GC-predicate fields to xce_scheduler_t (6-3) - -**Files:** -- Modify: `src/scheduler/include/scheduler.h` - -- [x] **Step 1: Write the failing test** - -In `src/scheduler/testsuite/test.c`, add: - -```c -#include -#include "scheduler.h" - -static void -test_scheduler_t_has_atomic_gc_fields(void) -{ - xce_scheduler_t sched; - memset(&sched, 0, sizeof(sched)); - - /* Verify atomic fields exist and are zero-initialized */ - TEST_ASSERT_EQUAL_INT(0, atomic_load(&sched.session_active)); - TEST_ASSERT_EQUAL_INT(0, atomic_load(&sched.eval_in_progress)); - TEST_ASSERT_EQUAL_INT(0, atomic_load(&sched.staging_merge_complete)); -} -``` - -In `main`, add: `TEST(test_scheduler_t_has_atomic_gc_fields);` - -- [x] **Step 2: Run to verify it fails** - -```bash -nix develop --command bash -c "cd /workspace/src && ninja -C build scheduler/testsuite/sched_test 2>&1 | tail -20" -``` - -Expected: compile error — `session_active` not a member of `xce_scheduler_t`. - -- [x] **Step 3: Add fields to xce_scheduler_t** - -In `src/scheduler/include/scheduler.h`, add three fields at the end of `xce_scheduler_t` (before the closing `}`, after `cbuf_t decisions;`): - -```c - _Atomic int session_active; /* 1 during scheduling session */ - _Atomic int eval_in_progress; /* 1 while eval_select loop runs */ - _Atomic int staging_merge_complete; /* 1 after staging merge completes */ -``` - -Also add `#include ` near the top of `scheduler.h` (after `#include `). - -- [x] **Step 4: Build and run** - -```bash -nix develop --command bash -c "cd /workspace/src && ninja -C build && build/scheduler/testsuite/sched_test" -``` - -Expected: `test_scheduler_t_has_atomic_gc_fields` PASS. - -- [x] **Step 5: Commit** - -```bash -git add src/scheduler/include/scheduler.h src/scheduler/testsuite/test.c -git commit -m "feat: add _Atomic gc-predicate fields to xce_scheduler_t (6-3)" -``` - ---- - -## Task 4: Add GC-predicate statics in scheduler.c + wire sel_optimize_set (6-4, 6-9) - -**Files:** -- Modify: `src/scheduler/src/scheduler.c` -- Modify: `src/scheduler/include/scheduler.h` - -The predicates are scheduler-internal — `static` helpers in `scheduler.c`. They are called at the GC call site (Task 7). The `fake_scheduler_t` stubs in `test_select.c` remain (unit tests still use them). - -- [x] **Step 1: Write failing test** - -In `src/scheduler/testsuite/test.c`, add: - -```c -static void -test_sel_optimize_level_set_at_init(void) -{ - /* After sched_init, sel_get_optimize_level() must return 1. */ - /* We can check it directly since it's a library call. */ - /* We can't call sched_init (it starts threads) so check indirectly: - * the field is set by sel_optimize_set — test the setter directly. */ - sel_optimize_set(1); - TEST_ASSERT_EQUAL_INT(1, sel_get_optimize_level()); - sel_optimize_set(0); /* reset for other tests */ -} -``` - -Add `#include "resreq.h"` to test includes. - -In `main`, add: `TEST(test_sel_optimize_level_set_at_init);` - -- [x] **Step 2: Run to verify it fails** - -```bash -nix develop --command bash -c "cd /workspace/src && ninja -C build scheduler/testsuite/sched_test 2>&1 | tail -20" -``` - -Expected: compile error — `sel_optimize_set` undeclared (not linked yet — Task 8 will fix meson.build; for now just verify the include path works). - -Note: If it fails on `sel_optimize_set` not linked, proceed to Step 3 and come back. - -- [x] **Step 3: Add static predicate helpers to scheduler.c** - -In `src/scheduler/src/scheduler.c`, after the `#include` block (around line 20), add: - -```c -#include "resreq.h" - -static int sched_session_active(xce_scheduler_t* sched) -{ - return atomic_load_explicit(&sched->session_active, memory_order_acquire); -} - -static int sched_eval_in_progress(xce_scheduler_t* sched) -{ - return atomic_load_explicit(&sched->eval_in_progress, memory_order_acquire); -} - -static int sched_staging_merge_complete(xce_scheduler_t* sched) -{ - return atomic_load_explicit(&sched->staging_merge_complete, - memory_order_acquire); -} -``` - -- [x] **Step 4: Wire sel_optimize_set(1) in sched_init** - -In `src/scheduler/src/scheduler.c`, in `sched_init` (line ~318), after `memset(sched, 0x0, sizeof(*sched));` (line ~357), add: - -```c - sel_optimize_set(1); -``` - -This must come before any `makeSelectNode` calls (which happen during job parsing). The write-once guard in `sel_optimize_set` ensures it can only be set once per process. - -- [x] **Step 5: Build** - -```bash -nix develop --command bash -c "cd /workspace/src && ninja -C build 2>&1 | grep -E 'error:|warning:|FAILED|OK' | head -20" -``` - -Expected: builds cleanly (the test executable link will be fixed in Task 9 meson update). - -- [x] **Step 6: Commit** - -```bash -git add src/scheduler/src/scheduler.c -git commit -m "feat: add sched GC predicate statics; wire sel_optimize_set(1) in sched_init (6-4, 6-9)" -``` - ---- - -## Task 5: Implement build_host_eval_ctx (6-7) - -`build_host_eval_ctx` flattens `xce_sched_worker_t.resvals` (a `zarray_t` of `xce_val_t*` indexed by `res_idx`) into the `numvals`/`strvals` arrays expected by `host_eval_ctx_t`. - -Capnp constants (from `controller.capnp.h`): `Value_u_fvalue = 5` (float), `Value_u_svalue = 4` (string), `Value_u_bvalue = 6` (bool → stored as 0.0/1.0 in `numvals`). - -**Files:** -- Modify: `src/scheduler/src/resource.c` - -- [x] **Step 1: Write the failing test** - -In `src/scheduler/testsuite/test.c`, add: - -```c -#include "sched/types.h" -#include "resreq.h" -#include "zarray.h" -#include "controller.capnp.h" - -/* build_host_eval_ctx is static — declare prototype for test access */ -static host_eval_ctx_t* build_host_eval_ctx(const xce_sched_worker_t* w, - int num_res); - -static void -test_build_host_eval_ctx_float(void) -{ - /* Build a worker with one float resource at res_idx=2 (value=4.0) */ - xce_sched_worker_t w; - memset(&w, 0, sizeof(w)); - zarray_init(&w.resvals, 8, NULL); - - xce_val_t v; - memset(&v, 0, sizeof(v)); - v.which = Value_u_fvalue; - v.u.fvalue = 4.0f; - xce_val_t* vp = &v; - - /* slot 0, 1 = NULL; slot 2 = &v */ - zarray_set(&w.resvals, 0, NULL); - zarray_set(&w.resvals, 1, NULL); - zarray_set(&w.resvals, 2, &vp); - - host_eval_ctx_t* ctx = build_host_eval_ctx(&w, 3); - TEST_ASSERT_NOT_NULL(ctx); - TEST_ASSERT_EQUAL_DOUBLE(4.0, ctx->numvals[2]); - TEST_ASSERT_NULL(ctx->strvals[2]); - - free((void*)ctx->numvals); - free((void*)ctx->strvals); - free(ctx); - zarray_fini(&w.resvals); -} -``` - -In `main`, add: `TEST(test_build_host_eval_ctx_float);` - -- [x] **Step 2: Run to verify it fails** - -```bash -nix develop --command bash -c "cd /workspace/src && ninja -C build scheduler/testsuite/sched_test 2>&1 | tail -20" -``` - -Expected: compile error — `build_host_eval_ctx` not yet defined. - -- [x] **Step 3: Implement build_host_eval_ctx in resource.c** - -In `src/scheduler/src/resource.c`, add `#include "controller.capnp.h"` to the include block, then add before `sched_meet_host_selection`: - -```c -/* Build a host_eval_ctx_t from a scheduler worker's resource-value zarray. - * Allocates numvals and strvals on the heap; caller frees all three. - * Returns NULL on OOM. */ -static host_eval_ctx_t* -build_host_eval_ctx(const xce_sched_worker_t* w, int num_res) -{ - host_eval_ctx_t* ctx = calloc(1, sizeof(*ctx)); - if (ctx == NULL) return NULL; - - double* numvals = calloc(num_res, sizeof(double)); - const char** strvals = calloc(num_res, sizeof(char*)); - if (numvals == NULL || strvals == NULL) { - free(numvals); - free(strvals); - free(ctx); - return NULL; - } - - for (int i = 0; i < num_res; i++) { - xce_val_t** slot = (xce_val_t**)zarray_get(&w->resvals, i); - if (slot == NULL || *slot == NULL) continue; - xce_val_t* v = *slot; - switch (v->which) { - case Value_u_fvalue: - numvals[i] = (double)v->u.fvalue; - break; - case Value_u_bvalue: - numvals[i] = v->u.bvalue ? 1.0 : 0.0; - break; - case Value_u_svalue: - strvals[i] = v->u.svalue; - break; - } - } - - ctx->num_res = num_res; - ctx->numvals = numvals; - ctx->strvals = strvals; - return ctx; -} - -static void -free_host_eval_ctx(host_eval_ctx_t* ctx) -{ - if (ctx == NULL) return; - free((void*)ctx->numvals); - free((void*)ctx->strvals); - free(ctx); -} -``` - -- [x] **Step 4: Check xce_val_t layout** - -```bash -grep -n 'xce_val_t\|fvalue\|svalue\|bvalue' src/include/xce/types.h | head -20 -grep -n 'Value_u_fvalue\|Value_u_svalue\|Value_u_bvalue' src/scheduler/src/resource.c || \ - grep -rn 'Value_u_fvalue' src/controller/ | head -3 -``` - -Verify the `u.fvalue`, `u.svalue`, `u.bvalue` field names match `xce_val_t` in `controller.capnp.h`. - -- [x] **Step 5: Build and run test** - -```bash -nix develop --command bash -c "cd /workspace/src && ninja -C build && build/scheduler/testsuite/sched_test -t test_build_host_eval_ctx_float" -``` - -Expected: PASS. - -- [x] **Step 6: Commit** - -```bash -git add src/scheduler/src/resource.c -git commit -m "feat: implement build_host_eval_ctx — project resvals zarray to host_eval_ctx_t (6-7)" -``` - ---- - -## Task 6: Implement sched_meet_host_selection (6-5) - -Replace the stub with `eval_select_simple`. This is the pragmatic Phase 6 approach (no session restructuring — deferred to a later phase). The `int` return value and `add_job_preason` call in the caller remain unchanged. - -**Files:** -- Modify: `src/scheduler/src/resource.c` - -- [x] **Step 1: Write the failing test** - -In `src/scheduler/testsuite/test.c`, add: - -```c -#include "kvmgr.h" - -static void -test_meet_host_selection_null_select_passes(void) -{ - /* A NULL select pointer means no expression — always pass */ - xce_scheduler_t sched; - memset(&sched, 0, sizeof(sched)); - xce_sched_worker_t w; - memset(&w, 0, sizeof(w)); - zarray_init(&w.resvals, 4, NULL); - - int rc = sched_meet_host_selection(&sched, &w, NULL); - TEST_ASSERT_EQUAL_INT(1, rc); - - zarray_fini(&w.resvals); -} - -static void -test_meet_host_selection_always_true_passes(void) -{ - xce_scheduler_t sched; - memset(&sched, 0, sizeof(sched)); - sel_optimize_set(1); - sel_node_table_init(); - - xce_sched_worker_t w; - memset(&w, 0, sizeof(w)); - zarray_init(&w.resvals, 4, NULL); - - /* SEL_TRUE root — must pass any host */ - xce_select_node_t* root = makeSelectNode(SEL_TRUE, 0, 0); - TEST_ASSERT_NOT_NULL(root); - - xce_select_t sel = { .root = root }; - int rc = sched_meet_host_selection(&sched, &w, &sel); - TEST_ASSERT_EQUAL_INT(1, rc); - - zarray_fini(&w.resvals); - gc_clear_marks(); - gc_sweep_select_nodes(NULL, 0); - sel_node_table_fini(); - sel_optimize_test_reset(); -} - -static void -test_meet_host_selection_always_false_fails(void) -{ - xce_scheduler_t sched; - memset(&sched, 0, sizeof(sched)); - sel_optimize_set(1); - sel_node_table_init(); - - xce_sched_worker_t w; - memset(&w, 0, sizeof(w)); - zarray_init(&w.resvals, 4, NULL); - - /* SEL_FALSE root — must fail every host */ - xce_select_node_t* root = makeSelectNode(SEL_FALSE, 0, 0); - TEST_ASSERT_NOT_NULL(root); - - xce_select_t sel = { .root = root }; - int rc = sched_meet_host_selection(&sched, &w, &sel); - TEST_ASSERT_EQUAL_INT(0, rc); - - zarray_fini(&w.resvals); - gc_clear_marks(); - gc_sweep_select_nodes(NULL, 0); - sel_node_table_fini(); - sel_optimize_test_reset(); -} -``` - -In `main`, register all three tests. - -- [x] **Step 2: Run to verify failures** - -```bash -nix develop --command bash -c "cd /workspace/src && ninja -C build scheduler/testsuite/sched_test 2>&1 | tail -20" -``` - -Expected: link errors (scheduler sources not yet in meson) OR `test_meet_host_selection_always_false_fails` FAIL (stub returns 1 for SEL_FALSE). - -Proceed to Step 3. - -- [x] **Step 3: Replace the stub in resource.c** - -In `src/scheduler/src/resource.c`, replace the `sched_meet_host_selection` function body (currently lines ~415-422): - -```c -int sched_meet_host_selection(xce_scheduler_t* sched, xce_sched_worker_t* w, - xce_select_t* s) -{ - if (s == NULL || s->root == NULL) return 1; - - /* Count resources: use resvals.caps as upper bound on res_idx */ - int num_res = (int)w->resvals.caps; - - host_eval_ctx_t* hctx = build_host_eval_ctx(w, num_res); - if (hctx == NULL) { - /* OOM: conservatively pass host — scheduler will reject on resource - * quantities anyway */ - return 1; - } - - int rc = eval_select_simple(s->root, hctx); - free_host_eval_ctx(hctx); - - /* eval_select_simple: 1=match, 0=no-match, <0=error (treat as no-match) */ - return (rc > 0) ? 1 : 0; -} -``` - -Add `#include "resreq.h"` to `resource.c` includes if not already present. - -- [x] **Step 4: Build and run** - -```bash -nix develop --command bash -c "cd /workspace/src && ninja -C build 2>&1 | grep -E 'error:|FAILED' | head -10" -``` - -Expected: builds cleanly. - -- [x] **Step 5: Commit** - -```bash -git add src/scheduler/src/resource.c -git commit -m "feat: implement sched_meet_host_selection using eval_select_simple (6-5)" -``` - ---- - -## Task 7: Drive GC from sched_end_session with live_jobs + atomic fence (6-8, 6-4, 6-12) - -`sched_end_session` collects all live jobs, performs the mark phase, inserts the seq_cst fence, then sweeps. The GC idle invariant (6-4) is enforced by the three predicate guards. - -**Files:** -- Modify: `src/scheduler/src/scheduler.c` - -- [x] **Step 1: Write the failing test** - -In `src/scheduler/testsuite/test.c`, add: - -```c -static void -test_gc_predicates_idle_invariant(void) -{ - /* session_active=0, eval_in_progress=0, staging_merge_complete=0 after - * memset — GC call site guard must NOT log_fatal. We can only test - * indirectly by calling sched_end_session on an empty scheduler. */ - xce_scheduler_t sched; - memset(&sched, 0, sizeof(sched)); - /* staging_merge_complete must be 1 for GC to proceed */ - atomic_store(&sched.staging_merge_complete, 1); - - sel_optimize_set(1); - sel_node_table_init(); - - /* sched_end_session with no jobs — should call gc with empty live_jobs */ - /* We can't call sched_end_session directly (it calls plugin_end_session - * which requires full init). Test the predicate reads directly. */ - TEST_ASSERT_EQUAL_INT(0, atomic_load(&sched.session_active)); - TEST_ASSERT_EQUAL_INT(0, atomic_load(&sched.eval_in_progress)); - TEST_ASSERT_EQUAL_INT(1, atomic_load(&sched.staging_merge_complete)); - - gc_clear_marks(); - gc_sweep_select_nodes(NULL, 0); - - sel_node_table_fini(); - sel_optimize_test_reset(); -} -``` - -In `main`, add: `TEST(test_gc_predicates_idle_invariant);` - -- [x] **Step 2: Run to verify** - -```bash -nix develop --command bash -c "cd /workspace/src && ninja -C build scheduler/testsuite/sched_test 2>&1 | tail -20" -``` - -- [x] **Step 3: Add live_jobs collection and GC call to sched_end_session** - -In `src/scheduler/src/scheduler.c`, replace `sched_end_session` (line ~752): - -```c -void sched_end_session(xce_scheduler_t* sched) -{ - plugin_end_session(sched); - - /* GC idle invariant guard — any violation is a use-after-free risk */ - if (sched_session_active(sched) || sched_eval_in_progress(sched) - || !sched_staging_merge_complete(sched)) { - log_fatal("sched_end_session: GC idle invariant violated: " - "session_active=%d eval_in_progress=%d staging_merge=%d", - sched_session_active(sched), - sched_eval_in_progress(sched), - sched_staging_merge_complete(sched)); - return; - } - - /* Collect live jobs into a flat array for GC mark phase */ - rtti_iter_t it; - xce_sched_job_t* job = NULL; - int njobs = 0; - int cap = 64; - xce_sched_job_t** live_jobs = calloc(cap, sizeof(*live_jobs)); - if (live_jobs == NULL) goto sweep; - - iter_init(&it); - lock(sched->jobs, RTTI_LOCK_READ); - while (iter_next(&it, sched->jobs, (void**)&job) == RTTI_ITER_OK) { - if (njobs >= cap) { - int newcap = cap * 2; - xce_sched_job_t** tmp = realloc(live_jobs, - newcap * sizeof(*live_jobs)); - if (tmp == NULL) { - unlock(sched->jobs); - iter_destroy(&it); - goto sweep_with_jobs; - } - live_jobs = tmp; - cap = newcap; - } - live_jobs[njobs++] = job; - } - unlock(sched->jobs); - iter_destroy(&it); - -sweep_with_jobs: - /* Mark phase: clear all gc_marks, then mark every select root reachable - * from live job resreq trees */ - gc_clear_marks(); - for (int i = 0; i < njobs; i++) { - xce_resreq_t* rr = live_jobs[i]->resreq; - if (rr == NULL) continue; - /* dispatch on resreq tag to reach all select roots */ - if (rr->tag == XCE_RESREQ_PRIMARY) { - if (rr->u.primary && rr->u.primary->select) - gc_mark_select_tree(rr->u.primary->select->root); - } else if (rr->tag == XCE_RESREQ_COMPOUND) { - if (rr->u.compound) { - xlist_iter_t li; - xce_primary_resreq_t* pr; - xlist_for_each(&rr->u.compound->primaries, &li, - (void**)&pr) { - if (pr && pr->select) - gc_mark_select_tree(pr->select->root); - } - } - } else if (rr->tag == XCE_RESREQ_ALTER) { - if (rr->u.alter) { - xlist_iter_t li; - xce_compound_resreq_t* cp; - xlist_for_each(&rr->u.alter->compounds, &li, - (void**)&cp) { - if (cp == NULL) continue; - xlist_iter_t li2; - xce_primary_resreq_t* pr; - xlist_for_each(&cp->primaries, &li2, (void**)&pr) { - if (pr && pr->select) - gc_mark_select_tree(pr->select->root); - } - } - } - } - } - - /* Fence: ensure all gc_mark writes are visible before the sweep reads - * them. Also ensures NULL-stores to unlinked roots (if any) are visible - * before gc_mark_select_tree reads root pointers. */ - atomic_thread_fence(memory_order_seq_cst); - -sweep: - gc_sweep_select_nodes(NULL, 0); - free(live_jobs); -} -``` - -Add `#include ` to `scheduler.c` includes, and ensure `#include "resreq.h"` is present. - -Check `xlist_for_each` macro — if it doesn't exist, use `xlist_iter_t` loop pattern from existing code in the file: - -```bash -grep -n 'xlist_for_each\|xlist_iter' src/scheduler/src/scheduler.c | head -5 -``` - -If `xlist_for_each` is not available, replace with the pattern used elsewhere in `scheduler.c`. - -- [x] **Step 4: Set/clear session_active and staging_merge_complete at session boundaries** - -In `sched_begin_session` (line ~740), at the START: - -```c - atomic_store_explicit(&sched->session_active, 1, memory_order_release); - atomic_store_explicit(&sched->staging_merge_complete, 0, memory_order_release); -``` - -In `sched_end_session`, at the END (after the GC sweep), add: - -```c - atomic_store_explicit(&sched->staging_merge_complete, 1, memory_order_release); -``` - -And in `sched_end_session` at the VERY START (before the guard), add: - -```c - atomic_store_explicit(&sched->session_active, 0, memory_order_release); -``` - -- [x] **Step 5: Build** - -```bash -nix develop --command bash -c "cd /workspace/src && ninja -C build 2>&1 | grep -E 'error:|FAILED' | head -20" -``` - -Expected: builds cleanly. - -- [x] **Step 6: Commit** - -```bash -git add src/scheduler/src/scheduler.c -git commit -m "feat: drive GC from sched_end_session — live_jobs mark, seq_cst fence, gc_sweep (6-8, 6-12)" -``` - ---- - -## Task 8: Add sel_alloc_thread_id thread-ownership checks (6-10) - -**Files:** -- Modify: `src/lib/xce_select.c` -- Modify: `src/include/resreq.h` -- Modify: `src/scheduler/src/scheduler.c` (register allocator thread) - -- [x] **Step 1: Write the failing test** - -In `src/lib/testsuite/test_select.c`, add: - -```c -static void -test_sel_register_alloc_thread(void) -{ - /* sel_alloc_thread_id is 0 (unregistered) before registration — - * thread checks must be skipped. After registration they must - * match pthread_self(). */ - sel_optimize_test_reset(); /* resets sel_alloc_thread_id to 0 */ - sel_optimize_set(1); - sel_node_table_init(); - - /* Should not crash when unregistered */ - xce_select_node_t* n = makeSelectNode(SEL_TRUE, 0, 0); - TEST_ASSERT_NOT_NULL(n); - - /* Register current thread */ - sel_register_alloc_thread(); - - /* makeSelectNode from same thread must still work */ - xce_select_node_t* n2 = makeSelectNode(SEL_FALSE, 0, 0); - TEST_ASSERT_NOT_NULL(n2); - - gc_clear_marks(); - gc_sweep_select_nodes(NULL, 0); - sel_node_table_fini(); - sel_optimize_test_reset(); -} -``` - -In `main`, add: `TEST(test_sel_register_alloc_thread);` - -- [x] **Step 2: Run to verify it fails** - -```bash -nix develop --command bash -c "cd /workspace/src && ninja -C build lib/testsuite/xce_test 2>&1 | tail -15" -``` - -Expected: compile error — `sel_register_alloc_thread` undeclared. - -- [x] **Step 3: Add sel_alloc_thread_id to xce_select.c** - -In `src/lib/xce_select.c`, add `#include ` to the include block. - -After the `sel_optimize_level` static variable declaration, add: - -```c -static pthread_t sel_alloc_thread_id; /* 0 = unregistered, skip checks */ -``` - -Add the registration function before `eval_select`: - -```c -void sel_register_alloc_thread(void) -{ - sel_alloc_thread_id = pthread_self(); -} -``` - -Extend `sel_optimize_test_reset` to also reset `sel_alloc_thread_id`: - -```c -void sel_optimize_test_reset(void) -{ - atomic_store_explicit(&sel_optimize_level, -1, memory_order_seq_cst); - sel_alloc_thread_id = 0; -} -``` - -- [x] **Step 4: Add thread checks in eval_select and gc_sweep_select_nodes** - -In `eval_select` (line ~633), after the `sel_get_optimize_level()` guard, add: - -```c - if (sel_alloc_thread_id != 0 && pthread_self() != sel_alloc_thread_id) { - ERROR("eval_select called from non-allocator thread"); - return -1; - } -``` - -In `gc_sweep_select_nodes` (line ~826), at the top after the `table == NULL` check, add: - -```c - if (sel_alloc_thread_id != 0 && pthread_self() != sel_alloc_thread_id) { - ERROR("gc_sweep_select_nodes called from non-allocator thread"); - return; - } -``` - -- [x] **Step 5: Declare sel_register_alloc_thread in resreq.h** - -In `src/include/resreq.h`, after `sel_optimize_set`/`sel_get_optimize_level`: - -```c -/* Register the current thread as the sole allocator thread. - * Must be called once before any eval_select or gc_sweep_select_nodes call. - * A value of 0 (default) disables the check (unit-test mode). */ -extern void sel_register_alloc_thread(void); -``` - -- [x] **Step 6: Wire registration in scheduler main loop** - -In `src/scheduler/src/main.c`, in the allocator thread's first `while(1)` iteration (line ~119, before `sched_begin_session`), add a one-time call: - -```c - /* Register this thread as the sole eval/GC thread (write-once) */ - static int sel_thread_registered = 0; - if (!sel_thread_registered) { - sel_register_alloc_thread(); - sel_thread_registered = 1; - } -``` - -Add `#include "resreq.h"` to `main.c` includes. - -- [x] **Step 7: Build and run** - -```bash -nix develop --command bash -c "cd /workspace/src && ninja -C build && build/lib/testsuite/xce_test -t test_sel_register_alloc_thread" -``` - -Expected: PASS. Run full lib suite: - -```bash -nix develop --command bash -c "cd /workspace/src && build/lib/testsuite/xce_test" -``` - -Expected: all tests PASS. - -- [x] **Step 8: Commit** - -```bash -git add src/lib/xce_select.c src/include/resreq.h src/scheduler/src/main.c -git commit -m "feat: add sel_alloc_thread_id ownership check in eval_select and gc_sweep (6-10)" -``` - ---- - -## Task 9: Scheduler testsuite — link resource.c + integration tests (6-11) - -**Files:** -- Modify: `src/scheduler/testsuite/meson.build` -- Modify: `src/scheduler/testsuite/test.c` - -- [x] **Step 1: Update meson.build to link scheduler source files** - -Replace `src/scheduler/testsuite/meson.build` with: - -```meson -scheduler_test_src = [ - 'test.c', - '../src/resource.c', -] - -scheduler_test_deps = [libxce_deps, librtti_dep, unity_dep] - -incdir = include_directories('../include', '../../include', '.') - -scheduler_test = executable('sched_test', - scheduler_test_src, - include_directories:[incdir], - dependencies: [scheduler_test_deps], - install: false) -``` - -Note: Only `resource.c` is needed — it implements the functions under test. `scheduler.c` (which calls `sched_init` and starts threads) is intentionally excluded to keep tests free of thread/network side effects. - -- [x] **Step 2: Write integration test with a known-good resreq/host pair** - -In `src/scheduler/testsuite/test.c`, add: - -```c -#include "xstring.h" - -static void -test_meet_host_selection_numeric_match(void) -{ - /* Job requires: ncpus >= 4. - * Worker has ncpus=8 at res_idx=0 → must match (rc=1). - * Worker has ncpus=2 at res_idx=0 → must not match (rc=0). */ - - sel_optimize_set(1); - xstring_table_init(64 * 1024); - sel_node_table_init(); - - /* Build resreq AST: ncpus >= 4 - * SEL_GE(SEL_RESNAME(res_idx=0, RES_TYPE_NUMERIC), SEL_NUM(4.0)) */ - xce_select_node_t* resname = makeSelectNode(SEL_RESNAME, 0, - RES_TYPE_NUMERIC); - xce_select_node_t* num4 = makeSelectNode(SEL_NUM, - (uintptr_t)(double)4.0, 0); - xce_select_node_t* ge = makeSelectNode(SEL_GE, - (uintptr_t)resname, - (uintptr_t)num4); - TEST_ASSERT_NOT_NULL(ge); - - xce_select_t sel = { .root = ge }; - - /* --- host with 8 cpus --- */ - xce_sched_worker_t w8; - memset(&w8, 0, sizeof(w8)); - zarray_init(&w8.resvals, 2, NULL); - - xce_val_t v8; - memset(&v8, 0, sizeof(v8)); - v8.which = Value_u_fvalue; - v8.u.fvalue = 8.0f; - xce_val_t* v8p = &v8; - zarray_set(&w8.resvals, 0, &v8p); - - xce_scheduler_t sched; - memset(&sched, 0, sizeof(sched)); - - TEST_ASSERT_EQUAL_INT(1, sched_meet_host_selection(&sched, &w8, &sel)); - - /* --- host with 2 cpus --- */ - xce_sched_worker_t w2; - memset(&w2, 0, sizeof(w2)); - zarray_init(&w2.resvals, 2, NULL); - - xce_val_t v2; - memset(&v2, 0, sizeof(v2)); - v2.which = Value_u_fvalue; - v2.u.fvalue = 2.0f; - xce_val_t* v2p = &v2; - zarray_set(&w2.resvals, 0, &v2p); - - TEST_ASSERT_EQUAL_INT(0, sched_meet_host_selection(&sched, &w2, &sel)); - - zarray_fini(&w8.resvals); - zarray_fini(&w2.resvals); - gc_clear_marks(); - gc_sweep_select_nodes(NULL, 0); - sel_node_table_fini(); - sel_optimize_test_reset(); -} - -static void -test_meet_host_selection_string_match(void) -{ - /* Job requires: hosttype == "gpu". - * Worker has hosttype="gpu" at res_idx=1 → must match. - * Worker has hosttype="cpu" at res_idx=1 → must not match. */ - - sel_optimize_set(1); - xstring_table_init(64 * 1024); - sel_node_table_init(); - - /* Build resreq AST: hosttype == "gpu" */ - xce_select_node_t* resname = makeSelectNode(SEL_RESNAME, 1, - RES_TYPE_STRING); - const char* gpu_str = xstring_get("gpu", 3); - xce_select_node_t* str_gpu = makeSelectNode(SEL_STR, - (uintptr_t)gpu_str, 0); - xce_select_node_t* eq = makeSelectNode(SEL_EQ, - (uintptr_t)resname, - (uintptr_t)str_gpu); - TEST_ASSERT_NOT_NULL(eq); - - xce_select_t sel = { .root = eq }; - - /* helper to build worker with string at res_idx=1 */ - xce_scheduler_t sched; - memset(&sched, 0, sizeof(sched)); - - xce_sched_worker_t wgpu; - memset(&wgpu, 0, sizeof(wgpu)); - zarray_init(&wgpu.resvals, 2, NULL); - - xce_val_t vgpu; - memset(&vgpu, 0, sizeof(vgpu)); - vgpu.which = Value_u_svalue; - vgpu.u.svalue = "gpu"; - xce_val_t* vgpup = &vgpu; - zarray_set(&wgpu.resvals, 1, &vgpup); - - TEST_ASSERT_EQUAL_INT(1, sched_meet_host_selection(&sched, &wgpu, &sel)); - - xce_sched_worker_t wcpu; - memset(&wcpu, 0, sizeof(wcpu)); - zarray_init(&wcpu.resvals, 2, NULL); - - xce_val_t vcpu; - memset(&vcpu, 0, sizeof(vcpu)); - vcpu.which = Value_u_svalue; - vcpu.u.svalue = "cpu"; - xce_val_t* vcpup = &vcpu; - zarray_set(&wcpu.resvals, 1, &vcpup); - - TEST_ASSERT_EQUAL_INT(0, sched_meet_host_selection(&sched, &wcpu, &sel)); - - zarray_fini(&wgpu.resvals); - zarray_fini(&wcpu.resvals); - gc_clear_marks(); - gc_sweep_select_nodes(NULL, 0); - sel_node_table_fini(); - sel_optimize_test_reset(); -} -``` - -In `main`, register: -```c - TEST(test_meet_host_selection_null_select_passes); - TEST(test_meet_host_selection_always_true_passes); - TEST(test_meet_host_selection_always_false_fails); - TEST(test_build_host_eval_ctx_float); - TEST(test_meet_host_selection_numeric_match); - TEST(test_meet_host_selection_string_match); - TEST(test_scheduler_t_has_atomic_gc_fields); - TEST(test_gc_predicates_idle_invariant); - TEST(test_sel_optimize_level_set_at_init); -``` - -- [x] **Step 3: Check xce_val_t field names** - -```bash -grep -n 'svalue\|fvalue\|bvalue\|xce_val_t' src/include/xce/types.h | head -20 -``` - -Adjust `v.u.fvalue`, `v.u.svalue`, `v.u.bvalue` in the tests if the generated capnp struct uses different field names. - -- [x] **Step 4: Build and run all scheduler tests** - -```bash -nix develop --command bash -c "cd /workspace/src && ninja -C build && build/scheduler/testsuite/sched_test" -``` - -Expected: all tests PASS. - -- [x] **Step 5: Run full build + lib testsuite to verify no regressions** - -```bash -nix develop --command bash -c "cd /workspace/src && ninja -C build && build/lib/testsuite/xce_test" -``` - -Expected: all tests PASS. - -- [x] **Step 6: Commit** - -```bash -git add src/scheduler/testsuite/meson.build src/scheduler/testsuite/test.c -git commit -m "test: scheduler integration tests for sched_meet_host_selection (6-11)" -``` - ---- - -## Self-Review Checklist - -| Spec item | Task | -|-----------|------| -| 6-1 pre-audit | Task 1 | -| 6-2 blocking gate grep | Task 1 | -| 6-3 _Atomic fields | Task 3 | -| 6-4 GC predicate wrappers (real scheduler) | Task 4 | -| 6-5 implement sched_meet_host_selection | Task 6 | -| 6-6 (deferred — void return + session restructure) | — | -| 6-7 build_host_eval_ctx | Task 5 | -| 6-8 live_jobs flat array + mark phase | Task 7 | -| 6-9 sel_optimize_set(1) | Task 4 | -| 6-10 sel_alloc_thread_id | Task 8 | -| 6-11 integration tests | Task 9 | -| 6-12 atomic_thread_fence | Task 7 | - -### Post-review fixes (final code review, 2026-04-30) - -| # | Severity | Finding | Fix | Commit | -|---|----------|---------|-----|--------| -| R1 | **CRITICAL** | `staging_merge_complete` bootstrap deadlock — `sched_begin_session` reset it to 0 but never set it back to 1; `sched_end_session`'s guard `(!staging_merge_complete)` always fired → GC never ran, select-node memory leaked indefinitely | Added `atomic_store_explicit(&sched->staging_merge_complete, 1, memory_order_release)` at end of `sched_begin_session` after `sched_account_jobs` | `d438742` | -| R2 | **HIGH** | `recompact_node_ids()` missing from GC protocol in `sched_end_session` — without recompaction `sel_node_next_id` grows monotonically; `select_eval_ctx_t` arrays (sized by max node_id) grow without bound across GC cycles | Added `recompact_node_ids()` call after `gc_sweep_select_nodes(NULL, 0)` | `d438742` | - -### Known deferred items - -- **6-6** (outer-host/inner-job session restructuring + `void` return): The current implementation uses `eval_select_simple` which re-evaluates the expression for every (host, job) call independently. The design doc describes a future optimisation where a single `select_eval_ctx_t` is reused per host across all jobs in a session. Deferred to a follow-on plan. - -- **`eval_in_progress` guard**: The `sched_eval_in_progress` check in `sched_end_session` is always false (field never set to 1). Correct under the current single-threaded model; wiring is deferred to when concurrent eval is introduced. diff --git a/src/docs/resreq-ast-cse-impl-plan.md b/src/docs/resreq-ast-cse-impl-plan.md deleted file mode 100644 index d130d95..0000000 --- a/src/docs/resreq-ast-cse-impl-plan.md +++ /dev/null @@ -1,233 +0,0 @@ -# Resreq AST + CSE Implementation Plan - -> Generated from: `resreq-ast-cse-design.md` -> Date: 2026-04-28 -> Branch: merge_api_server - ---- - -## Summary Priority Order - -``` -P0 (blocking): makeString() TOCTOU fix, section.peg boundary bug ✓ DONE -Phase 1: TDD test skeletons (parallel with Phase 3) ✓ DONE -Phase 2: Header definitions + ABI audit ✓ DONE -Phase 3: PEG grammar (parallel with Phase 1) ✓ DONE 143 PASS / 3 FAIL (stubs) -Phase 4a: Core interning + sel_optimize_level ✓ DONE 145 PASS / 1 FAIL (Phase 4b stub) -Phase 4b: Type validation (gated on P0-1) ✓ DONE 203 PASS (2026-04-29) -Phase 4c: AND/OR associativity flattening ✓ DONE 157 PASS (2026-04-29) -Phase 4d: Const-fold transform ✓ DONE (2026-04-29) -Phase 4e: Memoized eval ✓ DONE 73 PASS (2026-04-29) -Phase 4f: GC + recompaction ✓ DONE 73 PASS (2026-04-29) -Phase 5: Build wiring ✓ DONE -Phase 6: Scheduler integration ✓ DONE 10 PASS (2026-04-30) -``` - ---- - -## P0 — Critical Prerequisites (blocking gate) - -Must complete before any Phase 4 work begins. - -| # | Task | Section | Rationale | -|---|------|---------|-----------| -| P0-1 | ~~**Fix `makeString()` TOCTOU in `src/lib/xstring.c`**~~ **DONE** — extended lock region to cover `makeInstance` + `key_add`, eliminating the TOCTOU window. `key_add` can no longer return `-EEXIST` on a miss path. | §5.4 | Silent NULL return corrupts the interned AST in all §7 numeric-to-string coercions; blocks Phase 4b entirely | -| P0-2 | ~~**Fix `section.peg` clause-boundary grammar**~~ **DONE** — Root cause: the original grammar used multiple ordered-choice alternatives in `select_statement` / `usage_statement` / `span_statement`, but PEG's `e*` always succeeds (matches empty), so alternatives 2+ were dead code (confirmed by packcc generating "defined but not used" for all `pcc_action_select_statement_N` functions). Fix: collapsed each statement rule into a single alternative with a compound negative lookahead covering all subsequent clause keywords. `select_statement` now stops at any of `rusage[`, `span[`, `same[`, `affinity[`, or `]`; `usage_statement` stops at `span[`, `same[`, `affinity[`, or `]`; `span_statement` stops at `same[`, `affinity[`, or `]`. Both implicit (`type==any span[ptile=1]`) and explicit (`select[type==any] span[ptile=1]`) select forms verified by TDD: `test_parse_section3` (implicit), `test_parse_section_explicit_select_with_span`, `test_parse_section_explicit_select_rusage_span`, `test_parse_section_span_not_in_select` — all PASS, no packcc dead-code warnings. | §3.1 | Silent span/rusage content bleed into selectString in all implicit-select + multi-clause inputs | - ---- - -## Phase 1 — TDD Tests (write failing skeletons first) ✓ DONE - -**Priority: HIGH — must come before implementation (TDD contract)** - -Develop concurrently with Phase 3 (grammar is the test oracle). - -| # | Task | Notes | -|---|------|-------| -| 1-1 | ~~Write `lib/testsuite/test_select.c` skeletons: parse valid expressions, unknown resource names (error), type mismatches (error)~~ **DONE** | | -| 1-2 | ~~Write tests: `SELECT_MAX_INPUT_LEN` (8192) overflow, `SELECT_MAX_DEPTH` (64) nesting overflow~~ **DONE** | | -| 1-3 | ~~Write CSE tests: `A&&B` and `B&&A` produce same pointer; two `makeSelectNode` calls with same args return same pointer~~ **DONE** — FAIL until Phase 4a | | -| 1-4 | ~~Write eval tests: numeric `>/<`/`==`, string `==`, bool standalone, `!`/`&&`/`||`, short-circuit~~ **DONE** | | -| 1-5 | ~~Write GC tests: unlink job root → `gc_sweep_select_nodes` frees unreachable node; subsequent `makeSelectNode` re-interns fresh node~~ **DONE** — FAIL until Phase 4f | | -| 1-6 | ~~Write GC predicate contract tests (`sched_session_active`, `sched_eval_in_progress`, `staging_merge_complete`) using `fake_scheduler_t` scaffold in `test_select.c`~~ **DONE** — FAIL until Phase 4f | Phase 6 wires real scheduler — signatures stable | -| 1-7 | ~~Create shared resmgr fixture: `src/lib/testsuite/test_resmgr_fixture.h` + `.c` with `make_test_resmgr()`/`free_test_resmgr()`~~ **DONE** | | - ---- - -## Phase 2 — Header Definitions ✓ DONE - -**Priority: HIGH — unblocks all implementation work** - -| # | Task | Notes | -|---|------|-------| -| 2-1 | ~~Add `res_type_t`, `sel_node_type_t`, `xce_select_node_t` typedef + struct to `include/resreq.h`~~ **DONE** | | -| 2-2 | ~~Fill `struct xce_resreq_select_` with `xce_select_node_t* root`~~ **DONE** | | -| 2-3 | ~~Declare all public APIs: `makeSelectNode`, `eval_select`, `eval_select_simple`, `select_eval_ctx_*`, `sel_node_table_*`, `gc_sweep_select_nodes`, `recompact_node_ids`~~ **DONE** | `gc_mark_tree` stays `static` in `.c` | -| 2-4 | ~~Add `var resmgr` field to `resreq_context_t` (outer PEG auxil)~~ **DONE** | | -| 2-5 | ~~Add `valtype_to_res_type` helper; omit `res_type_to_valtype` (no current consumer — YAGNI)~~ **DONE** | | -| 2-6 | ~~Add `xce_str_match` as `static inline` wrapping `strcmp`~~ **DONE** | | -| 2-7 | ~~**CGO audit**: `grep -rn 'parse_resreq\|C\.parse_resreq' src/frontend/`~~ **DONE** — no CGO callers found | | -| 2-8 | ~~Update `parse_resreq_primary` and `parse_resreq` signatures to accept `var resmgr`~~ **DONE** — call sites updated: `schedobj.c:171`, `test_resreq.c:244/301/330` | | - ---- - -## Phase 3 — PEG Grammar (`lib/xce_select.peg`) ✓ DONE - -**Priority: HIGH — develop concurrently with Phase 1** - -| # | Task | Notes | -|---|------|-------| -| 3-1 | ~~Implement `select_expr` grammar (§3.1): `\|\|`, `&&`, `!`, comparisons, resname, literals, `any`~~ **DONE** | | -| 3-2 | ~~Implement `select_context_t` auxil with `resmgr`, `depth`, `errmsg[256]`, `has_error`~~ **DONE** | | -| 3-3 | ~~Implement `resname` action: `key_find`, `res_idx` validity guard, `valtype_to_res_type` mapping~~ **DONE** | | -| 3-4 | ~~**Clause-keyword conflict check** in `resname` action: check against `{select, rusage, span, same, affinity}`~~ **DONE** | | -| 3-5 | ~~Implement `SELECT_MAX_INPUT_LEN` (8192) and `SELECT_MAX_DEPTH` (64) guards~~ **DONE** | | -| 3-6 | ~~LSF-compatible disambiguation: bare word vs known resource name → `SEL_RESNAME` vs `SEL_STR`; `any` excluded by grammar; `true`/`false` produce migration diagnostic~~ **DONE** | | -| 3-R1 | ~~**[Review fix — HIGH]** Switch `SEL_STR` from `strdup`/`free` to `makeString`/`dereference` in `xce_select.peg` and `xce_select.c`~~ **DONE** — xstring-interned strings now refcounted; `kill_select_node` calls `dereference()` | | -| 3-R2 | ~~**[Review fix — MEDIUM]** Add `_Static_assert(sizeof(uintptr_t) >= sizeof(double))` before `makeSelectNode` in `xce_select.c`~~ **DONE** — guards the `SEL_NUM` bit-cast at compile time | | -| 3-R3 | ~~**[Review fix — MEDIUM]** Add `!("any" ![a-zA-Z_0-9])` negative lookahead to `resname_node` and `resname_leaf` in `xce_select.peg`~~ **DONE** — prevents `any` keyword from being tried as a resource name | | - ---- - -## Phase 4a — Core Node Allocation and Interning ✓ DONE - -**Priority: HIGH — foundational; unblocks 4b–4f** - -| # | Task | Notes | -|---|------|-------| -| 4a-1 | ~~Implement `sel_optimize_level` (`static _Atomic int`, sentinel -1) with `sel_optimize_set()` write-once CAS and `sel_get_optimize_level()` accessor~~ **DONE** | | -| 4a-2 | ~~Implement `sel_make_key()` — zero padding bytes via struct literal init; SEL_RESNAME zeroes `op2` for key purposes (res_type stored in node, not in key)~~ **DONE** | | -| 4a-3 | ~~Implement `sel_key_hash` over the 3 key fields~~ **DONE** | | -| 4a-4 | ~~Implement `sel_node_table_init` / `sel_node_table_fini` — `makeInstance(&kvtab_type, ¶ms)` with **`datakiller=NULL`**, `zarray_init` for linear nodes array~~ **DONE** | | -| 4a-5 | ~~Implement `makeSelectNode` — CSE-disabled fast path; CSE-enabled path with commutativity sort, key lookup, TOCTOU double-check under lock, node_id assignment via `atomic_fetch_add`, zarray rollback via `atomic_fetch_sub`~~ **DONE** | | -| 4a-6 | ~~Implement `sel_node_to_key()` for GC key reconstruction (must apply same commutativity sort as `makeSelectNode`)~~ **DONE** | | -| 4a-7 | ~~Add `sel_optimize_test_reset()` test-only helper (`#ifdef UNIT_TEST`): `atomic_store_explicit` reset to -1 plus `sel_node_table_fini`~~ **DONE** | | -| 4a-R1 | ~~**[Review fix — HIGH]** Move `node_id` assignment inside lock after `key_add` succeeds so TOCTOU losers need no counter rollback~~ **DONE** | Counter divergence under concurrent load | -| 4a-R2 | ~~**[Review fix — HIGH]** Add `dereference((char*)op1)` on first-lock cache hit for SEL_STR — caller transfers xstring ownership~~ **DONE** | Ref leak on every cache hit for string nodes | -| 4a-R3 | ~~**[Review fix — HIGH]** Add `SEL_MAX_INTERNED_NODES` cap check in both lock sections (first miss + TOCTOU re-check)~~ **DONE** | Unbounded table growth without cap | -| 4a-R4 | ~~**[Review fix — HIGH]** Fix `sel_node_table_fini` to iterate and free all interned nodes before `destroy(table)` — NULL datakiller does not free them~~ **DONE** | All nodes leaked at teardown; LSAN clean now | -| 4a-R5 | ~~**[Review fix — MEDIUM]** Set `node->hashcode = sel_key_hash_fn(&key)` in CSE path — was left 0, breaking Phase 4e memoization~~ **DONE** | | -| 4a-R6 | ~~**[Review fix — MEDIUM]** Add `dereference((char*)op1)` on `calloc` failure in level==0 path~~ **DONE** | xstring ref leak on OOM | -| 4a-R7 | ~~**[Review fix — MEDIUM]** Add `-EINVAL` guard on `key_find` — corrupt table must not silently proceed~~ **DONE** | | -| 4a-R8 | ~~**[Review fix — MEDIUM]** Add `-EEXIST` recovery in `key_add` failure path — re-find and return the racing winner~~ **DONE** | Rare concurrent insert race | -| 4a-R9 | ~~**[Review fix — LOW]** Change `_Static_assert(sizeof(uintptr_t) >= ...)` to `==` per spec requirement~~ **DONE** | | - ---- - -## Phase 4b — Parse-Time Type Validation ✓ DONE (2026-04-29) - -**Priority: HIGH — gate: P0-1 `makeString()` fix must be merged first** - -| # | Task | Notes | -|---|------|-------| -| 4b-1 | ~~Wire `parse_select()` into `parse_resreq_primary` **before** `kill_resreq_data`~~ **DONE** | Use-after-free if called after `kill_resreq_data` frees `data.selectString` | -| 4b-2 | ~~Implement EQ/NE type validation: reject BOOL×STR; coerce SEL_NUM to SEL_STR when comparing with string resource (`snprintf "%.17g"`), NULL-check `makeString` result, symmetric coercion~~ **DONE** | Free orphaned SEL_NUM node in unoptimized mode before overwriting pointer | -| 4b-3 | ~~Implement `>/<`/`>=`/`<=` type validation: reject non-numeric operands~~ **DONE** | `log_fatal` (not `assert`) for belt-and-suspenders at eval time too | -| 4b-4 | ~~Implement `res_idx` validity guard and unknown-resource error; add migration diagnostic for `true`/`false` identifiers (parse as SEL_RESNAME with no match)~~ **DONE** | | -| 4b-5 | ~~Update `kill_primary_resreq` for conditional teardown: CSE-enabled → null root only; CSE-disabled → `free_select_tree()` then `FREEUP`~~ **DONE** | NULL store before `FREEUP` to prevent GC mark dangling-pointer race | -| 4b-6 | ~~**LC_NUMERIC enforcement**: wrap PEG parser call in `parse_select` with `newlocale(LC_NUMERIC_MASK, "C")` / `uselocale` / `freelocale`; `log_fatal` on failure in scheduler, `log_error`+return in API server~~ **DONE** | `_XOPEN_SOURCE 700` required before system headers | -| 4b-7 | ~~**strtod locale coverage check**~~ **DONE — SAFE**: packcc emits single `strtod` in `pcc_action_value_node_1` (line 1593 of generated file), inside the `uselocale` scope — no locale vulnerability | | -| 4b-R1 | ~~**[Review fix — HIGH]** Add `lock(auxil->resmgr, RTTI_LOCK_READ)` / `unlock(auxil->resmgr)` around `key_find` in `resolve_resname()` (`xce_select.peg:38`) — missing read lock caused data race in multi-threaded scheduler~~ **DONE** | | -| 4b-R2 | **[Review check — F2]** STRING×NUM coercion error paths reviewed: `makeSelectNode` releases the xstring on OOM failure (level-0 path calls `dereference(op1)` before returning NULL); outer `makeSelectNode(op_type)` failure correctly calls `SEL_DISCARD(l)` + `SEL_DISCARD(r)` — **no leak, false positive** | | - ---- - -## Phase 4c — Commutativity + Associativity Flattening ✓ DONE (2026-04-29) - -| # | Task | Notes | -|---|------|-------| -| 4c-1 | ~~Verify commutativity sort in `makeSelectNode` step 1 covers AND/OR/EQ/NE; non-commutative GT/LT/GE/LE/NOT unchanged~~ **DONE** — `test_cse_gt_not_commutative` confirms GT is not commutative; AND/OR/EQ/NE sort verified. | Already integrated in §5.4 design | -| 4c-2 | ~~Implement post-parse **flatten pass** for `&&`/`||` chains: `do { changed = flatten_pass(root); } while (changed)`~~ **DONE** — `sel_flatten_pass` added to `xce_select.c`; do-while loop in `parse_select()` in `resreq.c`; 7 tests: noop, single-level, deep 3+, OR, mixed-ops, CSE mode. 157 PASS. | Repeat-until-stable needed for depth-3+ explicit parenthesization | -| 4c-3 | ~~In unoptimized mode: `flatten_pass` must `free()` each orphaned node — not its children (re-parented children must not be freed)~~ **DONE** — level==0 path frees orphaned intermediate node (`free(new_right); free(node)`) after re-parenting A/B/C; SEL_NOT branch frees `node` only. | Children freed would cause double-free when `free_select_tree` walks from root | - -**Senior review fixes applied (2026-04-29):** -- **[MEDIUM — OOM safety]** In AND/OR branch: update `node->u.binop.left/right` in-place (level==0) immediately after recursive calls, before any `makeSelectNode`. This ensures `return node` after OOM returns a valid tree with live (not dangling) children. -- **[LOW — dead code]** Removed dead `if (node->type == SEL_STR ...)` / `if (new_right->type == SEL_STR ...)` guards in AND/OR and SEL_NOT branches — those nodes are never SEL_STR in those arms. - ---- - -## Phase 4d — Const-Fold Transform ✓ DONE (2026-04-29) - -| # | Task | Notes | -|---|------|-------| -| 4d-1 | ~~`resname == any` → `SEL_TRUE`; `resname != any` → `SEL_FALSE` — check **both** child slots for SEL_ANY pointer (commutativity sort is ASLR-nondeterministic across runs)~~ **DONE** | | -| 4d-2 | ~~Identity laws: `SEL_TRUE && X` → `X`; `SEL_FALSE \|\| X` → `X`~~ **DONE** | | -| 4d-3 | ~~Annihilation laws: `SEL_FALSE && X` → `SEL_FALSE`; `SEL_TRUE \|\| X` → `SEL_TRUE`~~ **DONE** | | -| 4d-4 | ~~Complement laws: `!SEL_TRUE` → `SEL_FALSE`; `!SEL_FALSE` → `SEL_TRUE`~~ **DONE** | Single-pass — const-fold shrinks trees, does not create new flattening opportunities | - ---- - -## Phase 4e — Evaluation with Memoization ✓ DONE (2026-04-29) - -| # | Task | Notes | -|---|------|-------| -| 4e-1 | ~~Implement `eval_get_bool`/`eval_set_bool` 2-bit bitmap accessors with `node_id >= bool_bits_cap` guards using `log_fatal`~~ **DONE** | `_Static_assert(EVAL_NONE == 0)` for memset-reset correctness | -| 4e-2 | ~~Implement `eval_select_inner` — recursive eval with **explicit** error propagation (`if (lv < 0) return -1`), NOT C `&&`/`||` (C's `-1` is truthy, would swallow errors)~~ **DONE** | SEL_ANY reaching eval → `log_fatal("SEL_ANY reached eval — const-fold not applied")` | -| 4e-3 | ~~Leaf cache writes in `eval_select_inner`: SEL_RESNAME writes to `ctx->num_vals[node_id]` or `ctx->str_vals[node_id]`; comparison ops call `eval_select(child, ctx)` then read cached arrays~~ **DONE** | **Critical**: `get_leaf_value()` must NOT be called directly — bypasses cache writes, silently reads 0.0/NULL | -| 4e-4 | ~~Implement memoized `eval_select` wrapper — bitmap cache check before calling `eval_select_inner`; cache EVAL_ERROR too (node-structural errors repeat per host)~~ **DONE** | | -| 4e-5 | ~~Implement `eval_select_simple` for unoptimized path — plain recursive tree-walk, no `select_eval_ctx_t`, thread-safe (no shared state)~~ **DONE** | | -| 4e-6 | ~~Add `eval_select` guard: `log_fatal` if `sel_get_optimize_level() <= 0`~~ **DONE** | | -| 4e-7 | ~~Implement `select_eval_ctx_init` / `select_eval_ctx_reset` / `select_eval_ctx_fini`~~ **DONE** | `node_count` snapshot at init; `reset` uses snapshot, never re-reads `sel_node_next_id` | -| 4e-8 | ~~Pre-session capacity check: `memset` extended bool_bits bytes after realloc (realloc does not zero extension); partial-OOM contract — all three reallocs (bool_bits, num_vals, str_vals) must succeed atomically or `log_fatal`~~ **DONE** | Mismatched capacities allow out-of-bounds write to num_vals with no inline bounds check | - ---- - -## Phase 4f — Mark-and-Sweep GC + Recompaction ✓ DONE (2026-04-29) - -| # | Task | Notes | -|---|------|-------| -| 4f-1 | ~~Implement `gc_mark_tree` — recursive DFS, early return on `node == NULL \|\| node->gc_mark`; handles leaf / SEL_NOT / binary node types~~ **DONE** — `__attribute__((unused))` for Phase 6 wire-in | Recursion bounded by `SELECT_MAX_DEPTH` (64); any increase requires stack analysis | -| 4f-2 | ~~Implement `gc_sweep_select_nodes` — Phase 6 guard placed **before** mark-clear (prevents two-call sweep-of-reachable-nodes bug); mark-clear iterates `caps`; sweep iterates `caps`, `zarray_del` before `free`~~ **DONE** — live_jobs traversal deferred to Phase 6 (sched/types.h not in libxce scope) | GC does NOT acquire `sel_node_table.lock` (idle-phase invariant) | -| 4f-3 | Insert **`atomic_thread_fence(memory_order_seq_cst)`** after all `primary->select->root = NULL` unlinks and before `gc_sweep_select_nodes` call — **Phase 6 call-site task** | Without fence: CPU/compiler may reorder NULL store after GC mark pass | -| 4f-4 | Runtime GC idle invariant guards at GC call site (`sched_session_active`, `sched_eval_in_progress`, `staging_merge_complete`) — `log_fatal` not `assert` — **Phase 6 call-site task** → see 6-3/6-4 | `assert` compiled out by NDEBUG; use-after-free would result | -| 4f-5 | ~~Implement `recompact_node_ids` — iterate `nodes` zarray over `caps` slots (not `count`, gaps exist after `zarray_del`), assign sequential `node_id`, reset `sel_node_next_id` via `atomic_store_explicit(..., memory_order_release)`~~ **DONE** | `node_id` and zarray slot index are **decoupled** — do not conflate | -| 4f-R1 | ~~**[Review fix — HIGH]** Move Phase 6 early-return guard to before mark-clear loop — prior ordering allowed two consecutive calls (njobs>0 then njobs==0) to sweep still-reachable nodes~~ **DONE** | Two-call scenario: first call clears all marks and returns; second call sweeps everything | -| 4f-R2 | ~~**[Review fix — HIGH]** Swap `free(node)` / `zarray_del` order — `zarray_del` NULLs slot first, then `free`; eliminates latent use-after-free if killer is ever installed on nodes zarray~~ **DONE** | | -| 4f-R3 | ~~**[Bug fix]** `sel_node_table_fini` iterated `nodes.count` instead of `nodes.caps` — after `zarray_del` creates gaps, new nodes slot into positions beyond `count` boundary and leaked~~ **DONE** | Manifested as 32-byte ASAN leak after GC sweep + reintern in same lifetime | - ---- - -## Phase 5 — Build Wiring - -| # | Task | Notes | -|---|------|-------| -| 5-1 | ~~Add `custom_target` for `xce_select.peg` in `lib/meson.build` matching `section_parser`/`rusage_parser` pattern~~ **DONE** | Verify `-o 'lib/xce_select'` path format: `grep -A8 'custom_target' src/lib/meson.build \| grep '\-o'` | -| 5-2 | ~~Add `xce_select_parser[0]` (generated `.c`) to `libxce_src`~~ **DONE** | | -| 5-3 | ~~Add `test_resmgr_fixture.c` to testsuite `executable()` sources in `lib/meson.build`~~ **DONE** | | - ---- - -## Phase 6 — Scheduler Integration - -**Status: ✓ DONE — 2026-04-30 — 10/10 scheduler tests pass** - -| # | Task | Notes | -|---|------|-------| -| 6-1 | ~~**Pre-Phase-6 audit**: confirm allocator-thread-only invariant~~ **DONE** `bb4a95c` | Single-threaded confirmed; stub at `resource.c:127` | -| 6-2 | ~~**Blocking gate**: all `sched_meet_host_selection` call sites accounted for~~ **DONE** `bb4a95c` | No missed call sites | -| 6-3 | ~~Add `_Atomic int session_active`, `eval_in_progress`, `staging_merge_complete` to `xce_scheduler_t`~~ **DONE** `823a66e` | Use `_Atomic int` not `volatile int` — ARM atomicity guarantee | -| 6-4 | ~~Implement GC predicate wrappers referencing real `xce_scheduler_t` fields~~ **DONE** `acda9bb` | Signatures unchanged; only wrapper body changed | -| 6-5 | ~~Implement `sched_meet_host_selection` via `eval_select_simple`~~ **DONE** `40261b7` | Full implementation replacing stub that always returned 1 | -| 6-6 | ~~`sched_meet_host_selection` returns int (0/1); preason on fail~~ **DONE** `40261b7` | int return kept; preason wired | -| 6-7 | ~~Implement `build_host_eval_ctx`~~ **DONE** `907d8d8` | Flattens `worker->resvals` zarray to `numvals`/`strvals` using `Value_u_fvalue/svalue/bvalue` | -| 6-8 | ~~Materialize `live_jobs` flat array from `sched->jobs` kvmgr~~ **DONE** `5267d36` | Growth-loop heap alloc; OOM-safe (double-guarded: `calloc` fail + `realloc` null-sentinel `742d79e`, `fb5127a`) | -| 6-9 | ~~Wire `sel_optimize_set(1)` at scheduler startup~~ **DONE** `acda9bb` | Called in `sched_init`; no `sel_optimize_set(0)` needed (API server has separate process) | -| 6-10 | ~~Set `sel_alloc_thread_id`; add thread-ID checks in `eval_select` and `gc_sweep_select_nodes`~~ **DONE** `b722e5c` `1eb4eb1` | `_Atomic int` registered flag + `pthread_equal` guard; registered before `while(1)` loop | -| 6-11 | ~~Write integration/parity tests against known-good resreq/host pairs~~ **DONE** `5fcf85c` | Numeric (`SEL_GE`) and string (`SEL_EQ`) pass/fail cases | -| 6-12 | ~~`atomic_thread_fence(memory_order_seq_cst)` before `gc_sweep_select_nodes`~~ **DONE** `5267d36` | After all `gc_mark_select_tree` calls in `sched_end_session` | -| R1 | ~~**[Review fix — CRITICAL]** `staging_merge_complete` bootstrap deadlock — GC never ran~~ **DONE** `d438742` | `sched_begin_session` never set it to 1; guard in `sched_end_session` always fired | -| R2 | ~~**[Review fix — HIGH]** `recompact_node_ids()` missing from GC protocol~~ **DONE** `d438742` | Added after `gc_sweep_select_nodes` in `sched_end_session` | - ---- - -## Key Implementation Traps - -1. **`free_select_tree` vs GC mode confusion** — calling `free_select_tree` in CSE-enabled mode or forgetting it in disabled mode both produce memory corruption. The `sel_get_optimize_level()` guard inside `free_select_tree` catches this with `log_fatal`. - -2. **`get_leaf_value()` bypass bug** — calling `get_leaf_value()` directly in comparison branches bypasses the `num_vals`/`str_vals` cache write. Comparisons silently read 0.0/NULL (calloc default) instead of actual host values. Every comparison operator must call `eval_select(child, ctx)` first, then read the typed cache array. - -3. **TOCTOU in `makeSelectNode`** — the double-check under lock (step 5) prevents node leaks when two threads race to intern the same node. The re-find must happen inside the lock or the winner could be freed before the loser reads it. - -4. **`atomic_thread_fence` before GC** — root-unlink writes (`primary->select->root = NULL`) must be visible to the GC mark pass. Without a seq_cst fence, CPU/compiler reordering causes GC to retain a node that should be swept (or vice versa). - -5. **Partial-OOM in `select_eval_ctx_t` resize** — if one of the three reallocs (bool_bits, num_vals, str_vals) succeeds and another fails, the capacities diverge and `eval_select_inner` can write out-of-bounds to `num_vals` (no inline bounds guard at write site). Treat all three as atomic — `log_fatal` on partial failure. diff --git a/src/docs/xce.md b/src/docs/xce.md index f4beb16..d70d102 100644 --- a/src/docs/xce.md +++ b/src/docs/xce.md @@ -1,32 +1,58 @@ Help of XCE =========== -This is the entrypoint of xce tool. Currently, we have following sub-commands available: +This is the entrypoint of xce tool. Currently, we have following sub-commands +available: -- controller -- worker -- scheduler -- apiserver -- shell +- **controller** — start xce controller daemon +- **worker** — start xcecd worker daemon +- **scheduler** — start xce scheduler daemon +- **apiserver** — start xce REST API server +- **shell** — interactive bash shell for troubleshooting +- **xcecli** — CLI tool for cluster interaction (job submit, query, admin) -If you run xce without any parameter or with parameter which is not in above, then it will show this help screen +If you run xce without any parameter or with a parameter not listed above, it +will show this help screen. ## controller -This command with start xce controller with given parameters after controller sub-command +Start the xce controller daemon with the given parameters after the +`controller` sub-command. + +Example: +``` +xce controller --config /etc/xce/controller.yaml +``` ## scheduler -This command with start xce scheduler with given parameters after scheduler sub-command +Start the xce scheduler daemon with the given parameters after the +`scheduler` sub-command. ## worker -This command will start xcecd with given parameters after worker sub-command +Start xcecd with the given parameters after the `worker` sub-command. ## apiserver -This command will start xce apiserver with given parameters after apiserver sub-command +Start the xce REST API server with the given parameters after the +`apiserver` sub-command. The API server provides HTTP endpoints for job +submission, queue management, and cluster queries, backed by JWT +authentication and RBAC authorization. + +## xcecli + +The xce CLI (`src/frontend/xcecli/`) provides command-line access to the +cluster. Common operations: + +- `xcecli job submit ` — submit a job +- `xcecli job list` — list jobs +- `xcecli queue status` — show queue state + +Built as a standalone Go binary; communicates with the API server over +its REST interface. ## shell -An interactive bash shell to start, this is just for trouble shoot +An interactive bash shell used for troubleshooting and inspection. Not +intended for normal cluster operation. diff --git a/src/frontend/CLAUDE.md b/src/frontend/CLAUDE.md index 1d6c0b6..0fa0db1 100644 --- a/src/frontend/CLAUDE.md +++ b/src/frontend/CLAUDE.md @@ -35,37 +35,14 @@ config/ YAML configs and JSON schemas ## Conventions -### Controllers -- Struct: `type {Resource}Controller struct{}` -- Handler signature: `func (c {Resource}Controller) {Action}{Resource}(ctx *gin.Context)` -- Always return via helpers — never write response directly: - ```go - ReturnSuccess(ctx, common.SUCCESS_CODE, common.SUCCESS_MSG, data) - ReturnError(ctx, common.ERROR_CODE, err.Error(), nil) - ``` +See `.kiro/steering/api-standards.md` (handler pattern, middleware chain, error codes, response format), `.kiro/steering/error-handling.md` (ReturnError early-return, zap logging), `.kiro/steering/security.md` (RBAC, JWT, auth backends), and `.kiro/steering/testing.md` (TDD, table-driven tests, state isolation). -### Error Handling -- Early return on every error — no deferred error accumulation -- Log with zap fields before returning: `logger.Error("msg", zap.Error(err))` -- Use `preCheck{Resource}Request()` helpers for input validation before business logic - -### RBAC -- Protect routes with `controllers.RequirePermission("action:domain")` middleware -- Permission strings follow `action:scope` pattern (e.g., `job:view:self`, `queue:submit:all`) - -### Logging -- Import as: `logger "apiserver/utils"` -- Always include context: `zap.String("key", val)`, `zap.Error(err)` - -### Models -- JSON tags use snake_case: `json:"field_name"` -- Required fields: `binding:"required"` -- YAML tags for config structs: `yaml:"field_name,omitempty"` - -### Tests -- Use `t.TempDir()` for file fixtures -- Reset global state with a helper (e.g., `resetRBACState()` pattern in rbac_check_test.go) -- Table-driven tests for filter/validation logic +### Quick reference (from steering) +- Handler: `preCheck*() → service call → ReturnSuccess/ReturnError; return` +- Middleware chain: WhitelistURL → WhitelistIP → RateLimit → JWT → CORS → RBAC +- RBAC: `RequirePermission("action:scope")` — permissions in `config/rbac.yaml` +- Logging: `logger.Error("msg", zap.Error(err))` — never `fmt.Println` +- Tests: co-located `_test.go`, `t.TempDir()`, global state reset via `t.Cleanup` ## Key Files - `controllers/response.go` — ReturnSuccess / ReturnError helpers diff --git a/src/include/request.h b/src/include/request.h index bf219ea..91c71ea 100644 --- a/src/include/request.h +++ b/src/include/request.h @@ -112,6 +112,47 @@ extern int xce_replconfig_reply_ssl_decode(SSL *ssl, */ extern void xce_free_request(xce_request_t *req); +/* + * xce_wal_batch_encode_raw / xce_wal_batch_req_raw: encode/send an + * OPCode_walCatchupEntry batch carrying raw WAL payload bytes. + * + * Bypasses the generated encode path (payload :Data cannot be carried + * through xce_data_t — same limitation as replConfigPush). Each + * entries[i]->raw_payload/raw_payload_len is written as a capnp Data + * (List(UInt8)); the legacy xce_data_t payload field is ignored. + * The receiver's xce_decode() extracts the bytes back into + * raw_payload/raw_payload_len on each decoded sub-entry. + * + * encode_raw fills pkt (caller frees via free_packet on error paths); + * req_raw allocates the packet and enqueues it on ep (non-blocking). + */ +extern int xce_wal_batch_encode_raw(wal_catchup_entry_t **entries, + int n_entries, + xce_peerinfo_t *from, + uint64_t seq, + io_packet_t *pkt); +extern int xce_wal_batch_req_raw(endpoint_t *ep, + wal_catchup_entry_t **entries, + int n_entries); + +/* + * xce_snapshot_chunk_encode_raw / xce_snapshot_chunk_req_raw: encode/send + * an OPCode_snapshotTransfer chunk carrying raw snapshot file bytes. + * Same raw-Data convention as xce_wal_batch_req_raw; chunk envelope + * fields (snapshot_lsn, chunk_index, chunk_offset, total_size, is_last) + * are taken from *chunk, payload bytes from payload/payload_len. + */ +extern int xce_snapshot_chunk_encode_raw(const snapshot_transfer_t *chunk, + const uint8_t *payload, + size_t payload_len, + xce_peerinfo_t *from, + uint64_t seq, + io_packet_t *pkt); +extern int xce_snapshot_chunk_req_raw(endpoint_t *ep, + const snapshot_transfer_t *chunk, + const uint8_t *payload, + size_t payload_len); + /* * xce_upgrade_config_req_extract: extract sha256 + bytes from a decoded * OP_upgradeConfig request. xce_decode() stores malloc'd copies in diff --git a/src/lib/delay.c b/src/lib/delay.c index 83ab8cf..f9fa27f 100644 --- a/src/lib/delay.c +++ b/src/lib/delay.c @@ -1,5 +1,4 @@ #include -#include #include #include #include diff --git a/src/lib/meson.build b/src/lib/meson.build index 8ea42a0..3e98b8a 100644 --- a/src/lib/meson.build +++ b/src/lib/meson.build @@ -173,6 +173,7 @@ libxce_test_src = ['testsuite/test.c', 'testsuite/test_libxce_retry.c', 'testsuite/test_netio_on_connected.c', 'testsuite/test_raft.c', + 'testsuite/test_wal_wire.c', 'raft/raft_sim.c', ] diff --git a/src/lib/netio.c b/src/lib/netio.c index 43c0011..fa6f8a8 100644 --- a/src/lib/netio.c +++ b/src/lib/netio.c @@ -4,6 +4,7 @@ #include #include #include +#include #include #include #include @@ -949,6 +950,11 @@ SSL_CTX* create_ssl_context(char* cert_file, char* key_file) int iomgr_init(iomgr_t* iomgr) { + /* Ignore SIGPIPE — writing to a closed peer socket returns EPIPE + * instead of killing the daemon. All daemons call iomgr_init before + * any socket I/O, so this protects controller, worker, and scheduler. */ + signal(SIGPIPE, SIG_IGN); + mylock_init(&(iomgr->lock)); iomgr->epoll_fd = epoll_create1(0); if (iomgr->epoll_fd < 0) { diff --git a/src/lib/request.c b/src/lib/request.c index 9eef056..75a687f 100644 --- a/src/lib/request.c +++ b/src/lib/request.c @@ -56,6 +56,35 @@ int xce_encode(xce_request_t* req, io_packet_t* pkt) return 1; } +/* extract_data_bytes: copy a capnp Data (List(UInt8)) field into a fresh + * malloc'd buffer. Returns NULL (*out_len = 0) for absent/empty fields or + * allocation failure. Used by xce_decode() to pre-extract raw payload + * bytes before capn_free() destroys the segment. */ +static uint8_t *extract_data_bytes(Data_ptr dp, size_t *out_len) +{ + *out_len = 0; + + capn_list8 l; + l.p = dp.p; + if (l.p.type == CAPN_NULL) + return NULL; + + int len = capn_len(l); + if (len <= 0) + return NULL; + + uint8_t *buf = (uint8_t *)malloc((size_t)len); + if (!buf) + return NULL; + if (capn_getv8(l, 0, buf, len) != len) { + free(buf); + return NULL; + } + + *out_len = (size_t)len; + return buf; +} + int xce_decode(io_packet_t* pkt, xce_request_t* req) { struct capn c; @@ -158,6 +187,47 @@ int xce_decode(io_packet_t* pkt, xce_request_t* req) } } + /* OPCode_walCatchupEntry: payload :Data per (sub-)entry — pre-extract + * raw bytes into raw_payload/raw_payload_len (replConfigPush pattern). + * The wire entries list order matches the decoded entries[] order. */ + if (rq.opcode == OPCode_walCatchupEntry + && req->body_which == Request_body_walcatchupentrymsg + && req->body.walcatchupentrymsg != NULL) { + + wal_catchup_entry_t *batch = req->body.walcatchupentrymsg; + WalCatchupEntry_ptr b_ptr = rq.body.walcatchupentrymsg; + + /* Top-level payload (single-entry mode) */ + batch->raw_payload = + extract_data_bytes(WalCatchupEntry_get_payload(b_ptr), + &batch->raw_payload_len); + + /* Batch sub-entries */ + WalCatchupEntry_list wlist = WalCatchupEntry_get_entries(b_ptr); + int wn = (wlist.p.type != CAPN_NULL) ? capn_len(wlist) : 0; + for (int i = 0; i < wn && i < batch->n_entries; i++) { + if (!batch->entries || !batch->entries[i]) + continue; + struct WalCatchupEntry we; + get_WalCatchupEntry(&we, wlist, i); + batch->entries[i]->raw_payload = + extract_data_bytes(we.payload, + &batch->entries[i]->raw_payload_len); + } + } + + /* OPCode_snapshotTransfer: chunk payload :Data — pre-extract raw bytes. */ + if (rq.opcode == OPCode_snapshotTransfer + && req->body_which == Request_body_snapshottransfermsg + && req->body.snapshottransfermsg != NULL) { + + snapshot_transfer_t *chunk = req->body.snapshottransfermsg; + SnapshotTransfer_ptr s_ptr = rq.body.snapshottransfermsg; + chunk->raw_payload = + extract_data_bytes(SnapshotTransfer_get_payload(s_ptr), + &chunk->raw_payload_len); + } + TRACE("%s request op %d seq %ld from %s", __func__, req->opcode, req->seq, REQUEST_FROM(req)); capn_free(&c); @@ -210,6 +280,29 @@ void xce_free_request(xce_request_t *req) rcpr->raw_bytes_len = 0; } + if (req->body_which == Request_body_walcatchupentrymsg + && req->body.walcatchupentrymsg != NULL) { + wal_catchup_entry_t *batch = req->body.walcatchupentrymsg; + free(batch->raw_payload); + batch->raw_payload = NULL; + batch->raw_payload_len = 0; + for (int i = 0; i < batch->n_entries; i++) { + if (!batch->entries || !batch->entries[i]) + continue; + free(batch->entries[i]->raw_payload); + batch->entries[i]->raw_payload = NULL; + batch->entries[i]->raw_payload_len = 0; + } + } + + if (req->body_which == Request_body_snapshottransfermsg + && req->body.snapshottransfermsg != NULL) { + snapshot_transfer_t *chunk = req->body.snapshottransfermsg; + free(chunk->raw_payload); + chunk->raw_payload = NULL; + chunk->raw_payload_len = 0; + } + free_Request(req); } @@ -356,6 +449,197 @@ int xce_replconfigpush_req_raw(endpoint_t *ep, xce_peerinfo_t *from, return 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. */ +static void wal_entry_to_wire(struct capn_segment *cs, + struct WalCatchupEntry *w, + const wal_catchup_entry_t *e) +{ + memset(w, 0, sizeof(*w)); + w->lsn = e->lsn; + w->entryType = e->entry_type; + if (e->raw_payload && e->raw_payload_len > 0) { + capn_list8 pl = capn_new_list8(cs, (int)e->raw_payload_len); + capn_setv8(pl, 0, e->raw_payload, (int)e->raw_payload_len); + w->payload.p = pl.p; + } +} + +/* + * xce_wal_batch_encode_raw: encode an OPCode_walCatchupEntry batch into pkt. + * + * Bypasses encode_WalCatchupEntry (whose payload field routes through + * xce_data_t — cannot carry raw bytes; same limitation as replConfigPush). + * Builds the Request manually: a top-level WalCatchupEntry container + * (lsn=0, entryType=0) whose entries list holds one element per batch + * entry, each with lsn/entryType and payload written as capnp Data from + * raw_payload/raw_payload_len. + * + * pkt is caller-allocated; on success it holds the serialized message + * (caller owns; enqueue or free with free_packet). Returns 0 or -errno. + */ +int xce_wal_batch_encode_raw(wal_catchup_entry_t **entries, int n_entries, + xce_peerinfo_t *from, uint64_t seq, + io_packet_t *pkt) +{ + struct capn c; + struct capn_segment *cs; + struct Request rq; + struct WalCatchupEntry top; + WalCatchupEntry_ptr tp; + Request_ptr rp; + int rc; + + if (pkt == NULL || n_entries <= 0 || entries == NULL) + return -EINVAL; + + capn_init_malloc(&c); + cs = capn_root(&c).seg; + + memset(&rq, 0, sizeof(rq)); + memset(&top, 0, sizeof(top)); + + /* Batch container: header fields zero, entries list carries the batch */ + WalCatchupEntry_list lst = new_WalCatchupEntry_list(cs, n_entries); + for (int i = 0; i < n_entries; i++) { + struct WalCatchupEntry w; + wal_entry_to_wire(cs, &w, entries[i]); + set_WalCatchupEntry(&w, lst, i); + } + top.entries = lst; + + tp = new_WalCatchupEntry(cs); + write_WalCatchupEntry(&top, tp); + + rq.opcode = OPCode_walCatchupEntry; + rq.seq = seq; + rq.body_which = Request_body_walcatchupentrymsg; + rq.body.walcatchupentrymsg = tp; + encode_PeerInfo_ptr(cs, &rq.from, from); + + rp = new_Request(cs); + write_Request(&rq, rp); + capn_setp(capn_root(&c), 0, rp.p); + + pkt->sz = capn_size(&c); + rc = alloc_packet(pkt); + if (rc < 0) { + capn_free(&c); + return -errno; + } + + capn_write_mem(&c, (uint8_t *)pkt->data, pkt->sz, 0); + capn_free(&c); + return 0; +} + +int xce_wal_batch_req_raw(endpoint_t *ep, wal_catchup_entry_t **entries, + int n_entries) +{ + if (ep == NULL) + return -EINVAL; + + io_packet_t *pkt = (io_packet_t *)calloc(1, sizeof(*pkt)); + if (!pkt) + return -ENOMEM; + + int rc = xce_wal_batch_encode_raw(entries, n_entries, ep->peer, + endpoint_getseq(ep), pkt); + if (rc < 0) { + free(pkt); + return rc; + } + + endpoint_enq(ep, &(pkt->link)); + return 0; +} + +/* + * xce_snapshot_chunk_encode_raw: encode an OPCode_snapshotTransfer chunk + * into pkt. Envelope fields from *chunk; payload bytes written as capnp + * Data from payload/payload_len (the legacy xce_data_t payload field is + * ignored). pkt is caller-allocated. Returns 0 or -errno. + */ +int xce_snapshot_chunk_encode_raw(const snapshot_transfer_t *chunk, + const uint8_t *payload, size_t payload_len, + xce_peerinfo_t *from, uint64_t seq, + io_packet_t *pkt) +{ + struct capn c; + struct capn_segment *cs; + struct Request rq; + struct SnapshotTransfer st; + SnapshotTransfer_ptr sp; + Request_ptr rp; + int rc; + + if (pkt == NULL || chunk == NULL) + return -EINVAL; + + capn_init_malloc(&c); + cs = capn_root(&c).seg; + + memset(&rq, 0, sizeof(rq)); + memset(&st, 0, sizeof(st)); + + st.snapshotLsn = chunk->snapshot_lsn; + st.chunkIndex = chunk->chunk_index; + st.chunkOffset = chunk->chunk_offset; + st.totalSize = chunk->total_size; + st.isLast = chunk->is_last ? 1 : 0; + if (payload && payload_len > 0) { + capn_list8 pl = capn_new_list8(cs, (int)payload_len); + capn_setv8(pl, 0, payload, (int)payload_len); + st.payload.p = pl.p; + } + + sp = new_SnapshotTransfer(cs); + write_SnapshotTransfer(&st, sp); + + rq.opcode = OPCode_snapshotTransfer; + rq.seq = seq; + rq.body_which = Request_body_snapshottransfermsg; + rq.body.snapshottransfermsg = sp; + encode_PeerInfo_ptr(cs, &rq.from, from); + + rp = new_Request(cs); + write_Request(&rq, rp); + capn_setp(capn_root(&c), 0, rp.p); + + pkt->sz = capn_size(&c); + rc = alloc_packet(pkt); + if (rc < 0) { + capn_free(&c); + return -errno; + } + + capn_write_mem(&c, (uint8_t *)pkt->data, pkt->sz, 0); + capn_free(&c); + return 0; +} + +int xce_snapshot_chunk_req_raw(endpoint_t *ep, const snapshot_transfer_t *chunk, + const uint8_t *payload, size_t payload_len) +{ + if (ep == NULL) + return -EINVAL; + + io_packet_t *pkt = (io_packet_t *)calloc(1, sizeof(*pkt)); + if (!pkt) + return -ENOMEM; + + int rc = xce_snapshot_chunk_encode_raw(chunk, payload, payload_len, + ep->peer, endpoint_getseq(ep), pkt); + if (rc < 0) { + free(pkt); + return rc; + } + + endpoint_enq(ep, &(pkt->link)); + return 0; +} + /* * xce_replconfig_reply_raw: primary sends OP_replConfig reply with real * config bytes via an endpoint (uses iomgr queueing). diff --git a/src/lib/testsuite/test.c b/src/lib/testsuite/test.c index 386df1a..73516ef 100644 --- a/src/lib/testsuite/test.c +++ b/src/lib/testsuite/test.c @@ -37,6 +37,7 @@ extern void test_cluster_parse(void); extern void test_libxce_retry(void); extern void test_netio_on_connected(void); extern void test_raft(void); +extern void test_wal_wire(void); void setUp(void) { return; } @@ -143,6 +144,7 @@ int main(int argc, char* argv[]) TEST(test_libxce_retry); TEST(test_netio_on_connected); TEST(test_raft); + TEST(test_wal_wire); return UNITY_END(); } diff --git a/src/scheduler/src/scheduler.c b/src/scheduler/src/scheduler.c index 83d14d3..cdef2b6 100644 --- a/src/scheduler/src/scheduler.c +++ b/src/scheduler/src/scheduler.c @@ -771,10 +771,25 @@ int sched_update(xce_scheduler_t* sched) int i; for (i = 0; i < req->u.resourceupdate.nresources; i++) { xce_resource_t* r = req->u.resourceupdate.resources[i]; - if (r == NULL) { - continue; + if (r == NULL) continue; + xce_resource_t* existing = makeResource(sched->resmgr, r); + if (existing == NULL) { + /* EEXIST: update-in-place on existing resource (add-or-update) */ + xce_resource_t* found = NULL; + if (key_find(sched->resmgr, r->name, (void**)&found) == 0 + && found != NULL) { + /* Copy mutable integer fields; desc/name are identity, + * distributions/hbased_defined are deep-structs. */ + found->valtype = r->valtype; + found->ordtype = r->ordtype; + found->flags = r->flags; + found->interval = r->interval; + WARN("%s updated existing resource %s", __func__, r->name); + } else { + WARN("%s makeResource failed for %s and lookup not found", + __func__, r->name); + } } - makeResource(sched->resmgr, r); } rc = 0; break; @@ -804,14 +819,16 @@ int sched_update(xce_scheduler_t* sched) for (i = 0; i < resvals->count; i++) { xce_resval_t* rv = resvals->vals[i]; xce_sched_worker_t* w = NULL; - if (rv == NULL) { - continue; - } + xce_resource_t* r = NULL; + if (rv == NULL) continue; w = sched_get_worker(sched, rv->host); - if (w == NULL) { + if (w == NULL) continue; + if (key_find(sched->resmgr, rv->name, (void**)&r) < 0 || r == NULL) { + WARN("%s unknown resource %s in per-worker resvals update", + __func__, rv->name); continue; } - zarray_put(&w->resvals, 0, rv->val); + zarray_put(&w->resvals, r->idx, rv->val); } rc = 0; break;