Rongsong Shen
f88e4ef431
/xce-audit-invariants controller found two live violations of the async I/O thread-role contract: ha_demotion_convergence_fn (ha_convergence.c) ran WAL truncation + tlog_exit()+execv() directly on the delaymgr thread, and ha_catchup_continuation_fn (config_repl.c) ran unbounded WAL-streaming to a standby directly on delaymgr -- the same single thread that drives heartbeats and election timeouts cluster-wide, so either blocks liveness for the whole cluster and risks a spurious election. A prior vtask-pool offload attempt (2026-07-10, bug-1429) deadlocked controller_unit_test because c->ha.pool is never initialized by the lightweight unit-test fixtures these functions run under, and was fully reverted. This fix instead uses the codebase's established slow-lane pattern (the same mechanism already used for snapshot-send, config-push, and peer connect) -- a 4th and 5th instance, not a new mechanism. New g_drive_async_demotion_offload / g_drive_async_catchup_offload flags ship default OFF, matching the original rollout discipline of the three reference offloads (shipped OFF, flipped ON later after a dedicated compatibility audit). Flipping ON was tried during validation and reproduced two distinct hazards against pre-existing fixtures that never call slowlane_init: the already-known hang, and a new ASan SEGV in commit_advance_locked (logged as bug-1452, not root-caused, deferred to the future flip-to-ON audit). Both flags verified OFF and the full 976-test suite clean, then the committed state re-verified clean against a live 10-round chaotic and 10-round sequential HA soak (zero job loss, zero divergence, both PASS).
1222 lines
57 KiB
C
1222 lines
57 KiB
C
#define _GNU_SOURCE
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/*
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* test_demotion_convergence.c — RED-phase tests for the demotion-convergence
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* sequence and the self-restart primitive (ha-convergence-recovery task 2.1).
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*
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* Requirements (this spec's IDs — see requirements.md):
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* 1.1 — on demotion from PRIMARY the controller STOPS persisting new state
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* BEFORE continuing demotion (persistence hooks disabled synchronously,
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* observed via hooks_registered reset + a hook-counter probe).
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* 1.2 — on demotion the controller removes all log entries ABOVE committed_lsn
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* (truncate above the committed boundary).
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* 1.3 — when truncation completes the controller self-restarts so in-memory
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* state is rebuilt by boot recovery from the committed prefix only.
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* 1.4 — if the self-restart cannot be performed, terminate FATALLY rather
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* than continue (FATAL contract; XCE_TESTING routes to ha_fatal_hook).
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* 1.5 — the demotion is logged with the truncation boundary (committed LSN and
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* prior log tip) before restarting (observed here via the truncation
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* cutoff: current_lsn collapses to committed_lsn + 1).
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* 1.6 — under test mode the controller invokes the ha_restart_hook seam in
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* place of process re-execution.
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* 1.7 — in-memory state is reconstructible from the persisted committed state
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* only (provisional entries above committed_lsn absent after replay).
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* 2.4 — single-outcome convergence (in-process half): a committed prefix +
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* uncommitted suffix, run through the demotion seam, replays to a
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* committed-only state.
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*
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* RED status against the current tree: raft_cb_become_follower (ha.c) neither
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* disables the persistence hooks nor schedules any truncate/restart work on the
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* PRIMARY→follower edge, and ha_self_restart is a RED scaffold (ha_convergence.c)
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* that does not yet honor the restart/fatal seams. Every case below therefore
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* FAILS until task 2.2 lands the demotion branch + the real primitive.
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*
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* Harness: a partial-but-real cluster_t (real persist over a private tmpdir,
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* wired commit engine, stub standby registry, un-started delaymgr) mirroring
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* test_ha_role_lifecycle.c's lifecycle_cluster_setup, plus the live-cluster
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* become-follower seam raft_cb_become_follower_with_cluster_for_test.
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*
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* AAA structure throughout.
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*/
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#include <assert.h>
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#include <dirent.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <inttypes.h>
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#include <pthread.h>
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#include <stdatomic.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <sys/vfs.h>
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#include <unistd.h>
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#include <unity/unity.h>
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#include "commit.h" /* commit_engine_t, commit_engine_init */
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#include "delay.h" /* delaymgr_t, delay_task_t */
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#include "ha.h" /* raft_cb_become_follower_with_cluster_for_test,
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* ha_self_restart, controller_saved_argv,
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* ha_restart_hook / ha_fatal_hook seams,
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* ha_set_demotion_offload_for_test */
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#include "ordq.h" /* ordq_item_t (drive the scheduled task) */
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#include "persist.h" /* persist_t, persist_truncate_wal_above */
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#include "repl.h" /* repl_add_standby / repl_set_commit_engine */
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#include "slowlane.h" /* slowlane_init/slowlane_fini (offload lane) */
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#include "xce/cluster_def.h" /* full cluster_t layout */
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#include "xce/errnox.h" /* XCE_ERR_STANDBY (task 1.4 resolve rc) */
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#ifdef XCE_TESTING
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/* ── Broadcast drop-hook (precedent: test_ha_role_lifecycle.c lc_drop_send_hook):
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* the stub int endpoints registered via repl_add_standby are not real
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* endpoint_t, so repl_broadcast must never dereference ep->peer. Installing
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* this hook drops the wire send harmlessly during priming appends. */
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extern int (*repl_broadcast_send_hook)(void *ep,
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wal_catchup_entry_t **entries,
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int n_entries);
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static int dc_drop_send_hook(void *ep, wal_catchup_entry_t **entries,
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int n_entries)
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{
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(void)ep; (void)entries; (void)n_entries;
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return 0;
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}
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/* ── Restart / fatal seam counters (Req 1.4, 1.6) ───────────────────────── */
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static atomic_int g_restart_calls;
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static atomic_int g_fatal_calls;
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static int g_restart_hook_rc; /* return code dc_restart_hook reports */
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static int dc_restart_hook(cluster_t *c)
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{
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(void)c;
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atomic_fetch_add(&g_restart_calls, 1);
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return g_restart_hook_rc;
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}
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static void dc_fatal_hook(const char *msg)
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{
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(void)msg;
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atomic_fetch_add(&g_fatal_calls, 1);
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}
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/* ── Cluster fixture (mirror of lifecycle_cluster_setup) ────────────────── */
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static cluster_t g_dc; /* large — must not live on the test stack */
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static int g_dc_eps[MAX_STANDBYS];
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static char g_dc_workdir[256]; /* the fixture tmpdir (workdir for replay) */
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#define DC_PERSIST_NAME "ctrl-test"
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/* OVERLAYFS_SUPER_MAGIC — overlay filesystems (the sandbox /tmp) report this
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* f_type from statfs(). Used to gate the cross-context boot-recovery assertion
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* in test_demotion_replay_yields_committed_only (bug-1128): on overlayfs a
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* freshly-opened fd over a just-ftruncate'd WAL intermittently reads a STALE
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* (pre-truncate) size, so re-recovering a separate persist_t over the same
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* segments replays the already-truncated suffix. This is a sandbox fd/metadata
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* coherence artifact, NOT a product bug (production self-restart is execv — a
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* full process replacement on a real fs that never aliases two persist
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* contexts). Defaults to the real-fs path (full assertion) when statfs fails. */
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#define DC_OVERLAYFS_SUPER_MAGIC 0x794c7630
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static int dc_path_is_overlayfs(const char *path)
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{
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struct statfs sb;
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if (statfs(path, &sb) != 0)
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return 0; /* on error, default to the real-fs path (full assertion) */
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return sb.f_type == (typeof(sb.f_type))DC_OVERLAYFS_SUPER_MAGIC;
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}
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static ha_config_t dc_ha_cfg(void)
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{
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ha_config_t cfg = {
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.heartbeat_interval_ms = 3000,
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.heartbeat_timeout_ms = 10000,
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.election_timeout_ms = 2000,
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.probe_connect_timeout_ms = 500,
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.max_promotion_retries = 5,
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};
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return cfg;
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}
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/* Build g_dc: real persist over a fresh tmpdir, n_standbys stub standbys, a
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* wired commit engine, an initialised-but-UNSTARTED delaymgr (so any task in
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* tasks.head was armed by the code under test, not by a background runner),
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* role forced to CTRL_PRIMARY with the persist hooks registered (so a demotion
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* has hooks to disable). Leaves committed_lsn at 0; callers set it. */
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static void dc_setup(const char *suffix, int n_peers, int n_standbys,
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uint64_t appended_lsn, int n_vcpus)
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{
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char name[32];
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char tmpdir[256];
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memset(&g_dc, 0, sizeof(g_dc));
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atomic_store(&g_restart_calls, 0);
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atomic_store(&g_fatal_calls, 0);
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g_restart_hook_rc = 0;
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ha_config_t cfg = dc_ha_cfg();
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TEST_ASSERT_EQUAL_INT(0, ha_init(&g_dc.ha, &cfg, 0));
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g_dc.ha.phase2_done = 1; /* no phase2 wiring in this fixture */
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g_dc.ha.n_peers = n_peers;
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persist_config_t pcfg = persist_config_defaults();
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pcfg.wal_sync_ms = 5000; /* slow background fsync — no races */
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pcfg.sync_timeout_ms = 50; /* no real standby ACKs here */
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snprintf(tmpdir, sizeof(tmpdir), "/tmp/xce_dc_%s_XXXXXX", suffix);
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TEST_ASSERT_NOT_NULL(mkdtemp(tmpdir));
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snprintf(g_dc_workdir, sizeof(g_dc_workdir), "%s", tmpdir);
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persist_set_workdir(&g_dc.persist, tmpdir, DC_PERSIST_NAME);
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TEST_ASSERT_EQUAL_INT(0, persist_init(&g_dc.persist, &pcfg, &g_dc));
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TEST_ASSERT_EQUAL_INT(0, persist_start(&g_dc.persist));
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/* Prime the appended watermark: current_lsn = appended_lsn + 1. */
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pthread_mutex_lock(&g_dc.persist.lock);
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g_dc.persist.current_lsn = appended_lsn + 1;
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pthread_mutex_unlock(&g_dc.persist.lock);
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atomic_store(&g_dc.persist.committed_lsn, 0);
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/* ha-commit-durability 2.2: self caps at durable_lsn. This fixture primes
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* the WAL tip in-memory (no bytes written → the flusher can't advance
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* durable_lsn itself), so mark the primed log durable up front to preserve
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* the pre-durability "self covers every appended entry" commit model. */
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atomic_store(&g_dc.persist.durable_lsn, appended_lsn);
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for (int i = 0; i < n_standbys; i++) {
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snprintf(name, sizeof(name), "dcsb%d", i);
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TEST_ASSERT_TRUE_MESSAGE(
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repl_add_standby(&g_dc.persist.repl, &g_dc_eps[i], name,
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7500 + (uint32_t)i) >= 0,
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"repl_add_standby must return a slot index >= 0");
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}
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TEST_ASSERT_EQUAL_INT(0,
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commit_engine_init(&g_dc.commit, &g_dc.persist, n_peers, n_vcpus));
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repl_set_commit_engine(&g_dc.persist.repl, &g_dc.commit);
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repl_broadcast_send_hook = dc_drop_send_hook;
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/* delaymgr initialised but NOT started — the demotion-convergence task,
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* once task 2.2 schedules it, lands in tasks.head and is driven manually
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* by dc_run_pending_task (D1: truncation + restart run off the callback). */
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TEST_ASSERT_EQUAL_INT(0, delaymgr_init(&g_dc.delaymgr, 100, NULL));
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/* Slow lane for the demotion-convergence offload (xce-audit-invariants
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* controller pass, thread-role violation 1 fix, 2026-07-18). The
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* offload flag defaults OFF (see g_drive_async_demotion_offload in
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* ha_convergence.c), so most tests using this fixture still take the
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* legacy inline path unchanged; the dedicated offload tests below flip
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* the flag ON explicitly, at which point ha_demotion_convergence_fn
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* hands the truncate + self-restart off to a REAL lane worker thread
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* here, so dc_run_pending_task returns promptly and the convergence
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* effects (truncation, restart-seam call) land asynchronously shortly
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* after — tests poll for them via dc_poll_restart_calls below
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* regardless of which path is active (harmless when already-complete). */
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TEST_ASSERT_EQUAL_INT(0, slowlane_init(&g_dc.slowlane, 2, 4));
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/* Make this a PRIMARY with hooks registered, so a demotion has the three
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* persistence hooks to disable (Req 1.1). ha_promote_to_primary runs the
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* shared promotion sequence (ha_do_promote → register hooks → heartbeat →
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* own-term gate); the un-started delaymgr keeps the heartbeat arm skipped. */
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TEST_ASSERT_EQUAL_INT(0, ha_promote_to_primary(&g_dc));
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TEST_ASSERT_EQUAL_INT_MESSAGE(
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(int)CTRL_PRIMARY,
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(int)atomic_load_explicit(&g_dc.ha.role, memory_order_acquire),
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"fixture precondition: node must be CTRL_PRIMARY before demotion");
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TEST_ASSERT_EQUAL_INT_MESSAGE(1, g_dc.ha.hooks_registered,
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"fixture precondition: persist hooks must be registered before demotion");
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}
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static void dc_teardown(void)
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{
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repl_broadcast_send_hook = NULL;
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ha_restart_hook = NULL;
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ha_fatal_hook = NULL;
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slowlane_fini(&g_dc.slowlane);
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commit_engine_fini(&g_dc.commit);
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delaymgr_fini(&g_dc.delaymgr);
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persist_stop(&g_dc.persist);
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persist_fini(&g_dc.persist);
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repl_fini(&g_dc.persist.repl);
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ha_fini(&g_dc.ha);
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/* tmpdir left on disk — /tmp is ephemeral */
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}
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/* Bounded poll until g_restart_calls reaches `want` (or the timeout elapses).
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* When the demotion offload flag is ON, the truncate + restart-seam call run
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* asynchronously on a real slow-lane worker thread after dc_run_pending_task
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* returns, so tests must poll rather than assert immediately; with the flag
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* OFF (current default) the call has already completed synchronously by the
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* time dc_run_pending_task returns, so this poll returns on its first
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* iteration — safe either way. */
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static int dc_poll_restart_calls(int want, int timeout_ms)
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{
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for (int i = 0; i < timeout_ms; i++) {
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if (atomic_load(&g_restart_calls) >= want)
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break;
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struct timespec ts = { .tv_sec = 0, .tv_nsec = 1000000L }; /* 1 ms */
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nanosleep(&ts, NULL);
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}
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return atomic_load(&g_restart_calls);
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}
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/* Count pending delaymgr tasks by walking the ordq head chain (read-only;
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* single-threaded test, delaymgr never started). Same seam the lifecycle
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* suite uses to assert promotion arms no watchdog. */
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static int dc_task_count(const delaymgr_t *mgr)
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{
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int count = 0;
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const ordq_item_t *it = mgr->tasks.head;
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while (it != NULL) {
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count++;
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it = it->next;
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}
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return count;
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}
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/* Run the single pending delaymgr one-shot task synchronously by invoking its
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* stored entry(args), then return the entry's rc. Returns DC_NO_TASK sentinel if
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* there is no pending task (RED: nothing was scheduled).
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*
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* The run task is DEQUEUED and its node freed, mirroring the real delaymgr worker
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* (delay.c: ordq_get → runner_fn → runcount-- → FREEUP for a runcount==1 task).
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* This is required for correctness, not just fidelity: the convergence task bodies
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* free their own heap ctx (the args), exactly as production does (the delaymgr
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* killer frees only the delay_task_t node, never args; production execv never
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* re-runs a one-shot). Peeking without dequeuing would let a SECOND
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* dc_run_pending_task call re-run an already-run task on a freed ctx
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* (heap-use-after-free) — e.g. the rejoin once-guard test, whose second reconcile
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* correctly schedules NO new task so the head still points at the consumed one.
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* Dequeuing makes that second call return DC_NO_TASK, as production would. */
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#define DC_NO_TASK 0x7fffffff
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static int dc_run_pending_task(delaymgr_t *mgr)
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{
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ordq_item_t *it = ordq_get(&mgr->tasks, NULL);
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if (it == NULL || it->data == NULL) {
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if (it != NULL)
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free(it);
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return DC_NO_TASK;
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}
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delay_task_t *t = (delay_task_t *)it->data;
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if (t->entry == NULL) {
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free(t);
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free(it);
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return DC_NO_TASK;
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}
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int rc = t->entry(t->args); /* task body frees its own args ctx */
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free(t); /* mirror the worker's FREEUP(t) for runcount==1 */
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free(it); /* mirror the worker's FREEUP(it) */
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return rc;
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}
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/* ── Continuation recorder (raft-apply-decoupling task 1.4) ───────────────
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* Minimal local recorder for commit_submit_async continuations, mirroring
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* test_commit_resolve.c's continuation_recorder_t/recorder_fn pattern (kept
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* as a separate file-static copy -- no cross-TU sharing of test statics). */
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typedef struct {
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_Atomic int calls;
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uint64_t last_lsn;
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commit_outcome_t last_outcome;
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int last_rc;
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} dc_continuation_recorder_t;
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static void dc_recorder_fn(void *ctx, uint64_t lsn, commit_outcome_t outcome,
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int rc)
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{
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dc_continuation_recorder_t *r = (dc_continuation_recorder_t *)ctx;
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r->last_lsn = lsn;
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r->last_outcome = outcome;
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r->last_rc = rc;
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atomic_fetch_add(&r->calls, 1);
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}
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/* ── Tests ──────────────────────────────────────────────────────────────── */
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/* 1.1: demotion from PRIMARY disables the persistence hooks synchronously in
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* the callback (before any further event could be persisted), observed via
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* hooks_registered transitioning 1 → 0.
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* RED: raft_cb_become_follower never disables hooks on the PRIMARY edge. */
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static void test_demotion_from_primary_disables_hooks(void)
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{
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dc_setup("hooks", /*n_peers=*/3, /*n_standbys=*/2,
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/*appended_lsn=*/5, /*n_vcpus=*/8);
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atomic_store(&g_dc.persist.committed_lsn, 3);
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/* Act: drive become-follower from PRIMARY with a LIVE cluster. */
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raft_cb_become_follower_with_cluster_for_test(&g_dc, /*term=*/7);
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/* Assert: hooks disabled synchronously (Req 1.1). */
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TEST_ASSERT_EQUAL_INT_MESSAGE(0, g_dc.ha.hooks_registered,
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"demotion from PRIMARY must disable the persistence hooks "
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"synchronously (hooks_registered 1→0, Req 1.1)");
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dc_teardown();
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printf("test_demotion_from_primary_disables_hooks: checked\n");
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}
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/* 1.2/1.3/1.5/1.6: demotion from PRIMARY schedules exactly one convergence task
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* (off the callback thread, D1); running it truncates above committed_lsn and
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* invokes the restart seam exactly once.
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* RED: no task is scheduled, so dc_run_pending_task returns DC_NO_TASK and the
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* truncation/restart assertions fail. */
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static void test_demotion_schedules_convergence_truncate_and_restart(void)
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{
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dc_setup("conv", /*n_peers=*/3, /*n_standbys=*/2,
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/*appended_lsn=*/9, /*n_vcpus=*/8);
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/* committed prefix ends at LSN 4; entries 5..9 are the uncommitted suffix. */
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atomic_store(&g_dc.persist.committed_lsn, 4);
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/* Install the test restart seam so the eventual self-restart is observable
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* deterministically rather than exec'ing the test binary (Req 1.6). */
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ha_restart_hook = dc_restart_hook;
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ha_fatal_hook = dc_fatal_hook;
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|
g_restart_hook_rc = 0; /* model a successful restart */
|
|
|
|
int tasks_before = dc_task_count(&g_dc.delaymgr);
|
|
|
|
/* Act: demotion edge. */
|
|
raft_cb_become_follower_with_cluster_for_test(&g_dc, /*term=*/7);
|
|
|
|
/* The convergence work runs OFF the callback (D1) — exactly one one-shot
|
|
* delaymgr task must have been scheduled (Req 1.2/1.3 deferred). */
|
|
int tasks_after = dc_task_count(&g_dc.delaymgr);
|
|
TEST_ASSERT_EQUAL_INT_MESSAGE(tasks_before + 1, tasks_after,
|
|
"demotion from PRIMARY must schedule exactly one convergence task "
|
|
"(truncate+restart off the callback thread, D1)");
|
|
|
|
/* Run the scheduled convergence task. If the offload flag is ON this
|
|
* only submits to the slow lane and returns fast — the truncate +
|
|
* restart-seam call complete asynchronously on a real lane worker
|
|
* thread shortly after — so poll below rather than assert immediately
|
|
* (also safe, and immediate, when the flag is OFF, the current
|
|
* default). */
|
|
int rc = dc_run_pending_task(&g_dc.delaymgr);
|
|
TEST_ASSERT_NOT_EQUAL_MESSAGE(DC_NO_TASK, rc,
|
|
"no convergence task was scheduled on the demotion edge (Req 1.2/1.3)");
|
|
|
|
/* Assert (Req 1.3/1.6): the restart seam was invoked exactly once
|
|
* (bounded poll — the lane worker runs asynchronously). */
|
|
TEST_ASSERT_EQUAL_INT_MESSAGE(1, dc_poll_restart_calls(1, 2000),
|
|
"demotion convergence must invoke the restart seam exactly once "
|
|
"after truncation (Req 1.3, 1.6)");
|
|
TEST_ASSERT_EQUAL_INT_MESSAGE(0, atomic_load(&g_fatal_calls),
|
|
"a successful restart must NOT invoke the fatal seam");
|
|
|
|
/* Assert (Req 1.2/1.5): truncation removed everything above committed_lsn —
|
|
* current_lsn collapses to committed_lsn + 1 (the truncation boundary).
|
|
* Safe to read now (no lock): observing g_restart_calls==1 above
|
|
* (seq_cst atomic) happens-after the lane worker's truncate, which
|
|
* happens-before its restart-seam call in program order on that thread —
|
|
* the same "atomic completion flag" idiom used throughout this suite
|
|
* (e.g. test_ha_dispatch_integration.c's poll_atomic_ge). */
|
|
TEST_ASSERT_EQUAL_UINT64_MESSAGE(
|
|
atomic_load(&g_dc.persist.committed_lsn) + 1, g_dc.persist.current_lsn,
|
|
"demotion convergence must truncate above committed_lsn (Req 1.2): "
|
|
"current_lsn must collapse to committed_lsn + 1");
|
|
|
|
dc_teardown();
|
|
printf("test_demotion_schedules_convergence_truncate_and_restart: checked\n");
|
|
}
|
|
|
|
/* 1.4: ha_self_restart with a FAILING restart hook must invoke the fatal seam
|
|
* (the FATAL contract — a divergent ex-primary must never continue serving).
|
|
* RED: the ha_self_restart scaffold (ha_convergence.c) does not route to the
|
|
* seams yet, so neither hook fires. */
|
|
static void test_self_restart_failure_invokes_fatal_hook(void)
|
|
{
|
|
dc_setup("fatal", /*n_peers=*/3, /*n_standbys=*/2,
|
|
/*appended_lsn=*/5, /*n_vcpus=*/8);
|
|
|
|
ha_restart_hook = dc_restart_hook;
|
|
ha_fatal_hook = dc_fatal_hook;
|
|
g_restart_hook_rc = -EIO; /* model an exec failure */
|
|
|
|
/* Act: invoke the primitive directly. */
|
|
(void)ha_self_restart(&g_dc);
|
|
|
|
/* Assert (Req 1.4/1.6): the restart seam was attempted, and because it
|
|
* failed, the fatal seam fired in place of abort(). */
|
|
TEST_ASSERT_EQUAL_INT_MESSAGE(1, atomic_load(&g_restart_calls),
|
|
"ha_self_restart must invoke the restart seam under XCE_TESTING (Req 1.6)");
|
|
TEST_ASSERT_EQUAL_INT_MESSAGE(1, atomic_load(&g_fatal_calls),
|
|
"a failing restart must invoke the fatal seam — the FATAL contract "
|
|
"(Req 1.4); the ex-primary must never continue with divergent state");
|
|
|
|
dc_teardown();
|
|
printf("test_self_restart_failure_invokes_fatal_hook: checked\n");
|
|
}
|
|
|
|
/* raft-apply-decoupling task 1.4 (Req 1.3/1.4, 9.3/9.4): demotion from
|
|
* PRIMARY must resolve every currently registered commit continuation as
|
|
* FAILED -- otherwise a client/fact waiting on a pending commit is left
|
|
* permanently unresolved once this node can never commit it. Registers TWO
|
|
* continuations at different uncommitted LSNs to prove the resolve loop
|
|
* handles the whole pending set, not just a single slot.
|
|
* RED: before task 1.4, raft_cb_become_follower's was-PRIMARY branch never
|
|
* calls into the commit engine, so both continuations stay pending forever
|
|
* (calls == 0). */
|
|
static void test_demotion_from_primary_resolves_pending_continuations_failed(void)
|
|
{
|
|
dc_setup("resolve", /*n_peers=*/3, /*n_standbys=*/2,
|
|
/*appended_lsn=*/9, /*n_vcpus=*/8);
|
|
atomic_store(&g_dc.persist.committed_lsn, 4);
|
|
|
|
dc_continuation_recorder_t low = {0};
|
|
dc_continuation_recorder_t high = {0};
|
|
|
|
/* Both lsns sit above committed_lsn=4 (majority is unreachable in this
|
|
* fixture -- standbys never ACK -- so both stay genuinely pending, not
|
|
* already resolved COMMITTED by the time we demote). */
|
|
TEST_ASSERT_EQUAL_INT(0,
|
|
commit_submit_async(&g_dc.commit, 5, dc_recorder_fn, &low));
|
|
TEST_ASSERT_EQUAL_INT(0,
|
|
commit_submit_async(&g_dc.commit, 9, dc_recorder_fn, &high));
|
|
|
|
/* Act: demotion edge from a LIVE PRIMARY. This fixture never wires a
|
|
* vtaskmgr pool (commit_set_pool is never called), so commit_resolve's
|
|
* dispatch falls back to the inline fallback -- the recorder runs
|
|
* synchronously on this thread, no polling required. */
|
|
raft_cb_become_follower_with_cluster_for_test(&g_dc, /*term=*/7);
|
|
|
|
TEST_ASSERT_EQUAL_INT_MESSAGE(1, atomic_load(&low.calls),
|
|
"demotion must resolve every pending continuation, including one "
|
|
"for an lsn that could still reach majority under normal operation "
|
|
"(Req 1.3/1.4/9.4)");
|
|
TEST_ASSERT_EQUAL_INT_MESSAGE((int)COMMIT_OUTCOME_FAILED,
|
|
(int)low.last_outcome, "demotion must resolve as FAILED, not COMMITTED");
|
|
TEST_ASSERT_EQUAL_INT_MESSAGE(-XCE_ERR_STANDBY, low.last_rc,
|
|
"demotion must use the existing -XCE_ERR_STANDBY vocabulary (the "
|
|
"same code the HA dispatch gate already uses to reject writes to a "
|
|
"non-primary)");
|
|
TEST_ASSERT_EQUAL_UINT64_MESSAGE(5, low.last_lsn,
|
|
"the recorder must observe the lsn it was registered for");
|
|
|
|
TEST_ASSERT_EQUAL_INT_MESSAGE(1, atomic_load(&high.calls),
|
|
"demotion must resolve the uncommitted-tail continuation as FAILED "
|
|
"exactly once");
|
|
TEST_ASSERT_EQUAL_INT_MESSAGE((int)COMMIT_OUTCOME_FAILED,
|
|
(int)high.last_outcome, "demotion must resolve as FAILED, not COMMITTED");
|
|
TEST_ASSERT_EQUAL_INT_MESSAGE(-XCE_ERR_STANDBY, high.last_rc,
|
|
"demotion must use the existing -XCE_ERR_STANDBY vocabulary");
|
|
TEST_ASSERT_EQUAL_UINT64_MESSAGE(9, high.last_lsn,
|
|
"the recorder must observe the lsn it was registered for");
|
|
|
|
dc_teardown();
|
|
printf("test_demotion_from_primary_resolves_pending_continuations_failed: "
|
|
"checked\n");
|
|
}
|
|
|
|
/* raft-apply-decoupling task 1.5 (Req 9.1-9.4): a CONCURRENT burst of
|
|
* pending continuations, registered from real pthreads racing each other
|
|
* for ce->lock, must ALL resolve exactly once (FAILED/-XCE_ERR_STANDBY)
|
|
* through the SAME real demotion detection path the test above exercises
|
|
* for a fixed pair -- proving commit_resolve_pending_above's
|
|
* snapshot-then-resolve loop holds against a registry populated under
|
|
* genuine multi-threaded contention, not just two sequential registrations. */
|
|
#define DC_BURST_N 10
|
|
|
|
typedef struct {
|
|
uint64_t lsn;
|
|
int rc;
|
|
dc_continuation_recorder_t* rec;
|
|
} dc_burst_arg_t;
|
|
|
|
static void* dc_burst_register_thread(void* p)
|
|
{
|
|
dc_burst_arg_t* a = (dc_burst_arg_t*)p;
|
|
|
|
a->rc = commit_submit_async(&g_dc.commit, a->lsn, dc_recorder_fn, a->rec);
|
|
return NULL;
|
|
}
|
|
|
|
static void test_demotion_concurrent_burst_resolves_all_pending_exactly_once(void)
|
|
{
|
|
dc_continuation_recorder_t recs[DC_BURST_N] = {0};
|
|
dc_burst_arg_t args[DC_BURST_N];
|
|
pthread_t tids[DC_BURST_N];
|
|
|
|
dc_setup("burst", /*n_peers=*/3, /*n_standbys=*/2,
|
|
/*appended_lsn=*/DC_BURST_N + 4, /*n_vcpus=*/16);
|
|
atomic_store(&g_dc.persist.committed_lsn, 4);
|
|
|
|
/* Register a burst of DC_BURST_N continuations CONCURRENTLY from real
|
|
* threads, all for LSNs above the committed floor (4) -- majority is
|
|
* unreachable in this fixture (standbys never ACK), so every one stays
|
|
* genuinely pending, not already resolved, by the time demotion fires. */
|
|
for (int i = 0; i < DC_BURST_N; i++) {
|
|
args[i].lsn = (uint64_t)(5 + i);
|
|
args[i].rc = -9999;
|
|
args[i].rec = &recs[i];
|
|
TEST_ASSERT_EQUAL_INT(
|
|
0, pthread_create(&tids[i], NULL, dc_burst_register_thread, &args[i]));
|
|
}
|
|
for (int i = 0; i < DC_BURST_N; i++) {
|
|
pthread_join(tids[i], NULL);
|
|
}
|
|
for (int i = 0; i < DC_BURST_N; i++) {
|
|
TEST_ASSERT_EQUAL_INT_MESSAGE(
|
|
0, args[i].rc,
|
|
"every concurrent registration ahead of the demotion must succeed");
|
|
}
|
|
TEST_ASSERT_EQUAL_INT(DC_BURST_N, g_dc.commit.inflight_waits);
|
|
|
|
/* Act: a single real demotion edge. The burst above is already fully
|
|
* registered by the time this fires -- this proves the BULK resolve
|
|
* path handles a registry populated by real concurrent registrants
|
|
* correctly, not just the pre-existing two-continuation case above. */
|
|
raft_cb_become_follower_with_cluster_for_test(&g_dc, /*term=*/9);
|
|
|
|
for (int i = 0; i < DC_BURST_N; i++) {
|
|
TEST_ASSERT_EQUAL_INT_MESSAGE(
|
|
1, atomic_load(&recs[i].calls),
|
|
"every continuation in the burst must resolve exactly once on "
|
|
"demotion");
|
|
TEST_ASSERT_EQUAL_INT_MESSAGE(
|
|
(int)COMMIT_OUTCOME_FAILED, (int)recs[i].last_outcome,
|
|
"demotion must resolve every pending continuation as FAILED");
|
|
TEST_ASSERT_EQUAL_INT_MESSAGE(-XCE_ERR_STANDBY, recs[i].last_rc,
|
|
"demotion must use the existing -XCE_ERR_STANDBY vocabulary");
|
|
TEST_ASSERT_EQUAL_UINT64_MESSAGE((uint64_t)(5 + i), recs[i].last_lsn,
|
|
"the recorder must observe the lsn it was registered for");
|
|
}
|
|
TEST_ASSERT_EQUAL_INT_MESSAGE(
|
|
0, g_dc.commit.inflight_waits,
|
|
"every admission slot in the burst must be released exactly once");
|
|
|
|
dc_teardown();
|
|
printf("test_demotion_concurrent_burst_resolves_all_pending_exactly_once: "
|
|
"checked\n");
|
|
}
|
|
|
|
/* Regression: demotion from STANDBY must NOT truncate, NOT restart, NOT disable
|
|
* hooks beyond today's behavior — byte-equivalent to the pre-spec path. A
|
|
* STANDBY has no registered hooks and no convergence work. */
|
|
static void test_demotion_from_standby_no_truncation_no_restart(void)
|
|
{
|
|
dc_setup("standby", /*n_peers=*/3, /*n_standbys=*/2,
|
|
/*appended_lsn=*/9, /*n_vcpus=*/8);
|
|
atomic_store(&g_dc.persist.committed_lsn, 4);
|
|
|
|
/* Force role to STANDBY and disable hooks (the non-PRIMARY precondition). */
|
|
TEST_ASSERT_EQUAL_INT(0, ha_demote_to_standby(&g_dc));
|
|
TEST_ASSERT_EQUAL_INT((int)CTRL_STANDBY,
|
|
(int)atomic_load_explicit(&g_dc.ha.role, memory_order_acquire));
|
|
|
|
ha_restart_hook = dc_restart_hook;
|
|
ha_fatal_hook = dc_fatal_hook;
|
|
|
|
uint64_t tip_before = g_dc.persist.current_lsn;
|
|
int tasks_before = dc_task_count(&g_dc.delaymgr);
|
|
|
|
/* Act: a second become-follower from a non-PRIMARY role. */
|
|
raft_cb_become_follower_with_cluster_for_test(&g_dc, /*term=*/8);
|
|
|
|
/* Assert: no convergence task, no truncation, no restart. */
|
|
TEST_ASSERT_EQUAL_INT_MESSAGE(tasks_before,
|
|
dc_task_count(&g_dc.delaymgr),
|
|
"demotion from STANDBY must schedule NO convergence task (regression)");
|
|
TEST_ASSERT_EQUAL_UINT64_MESSAGE(tip_before, g_dc.persist.current_lsn,
|
|
"demotion from STANDBY must NOT truncate the WAL (regression)");
|
|
TEST_ASSERT_EQUAL_INT_MESSAGE(0, atomic_load(&g_restart_calls),
|
|
"demotion from STANDBY must NOT self-restart (regression)");
|
|
|
|
dc_teardown();
|
|
printf("test_demotion_from_standby_no_truncation_no_restart: checked\n");
|
|
}
|
|
|
|
/* Regression: demotion from ELECTING must NOT truncate or restart. */
|
|
static void test_demotion_from_electing_no_truncation_no_restart(void)
|
|
{
|
|
dc_setup("electing", /*n_peers=*/3, /*n_standbys=*/2,
|
|
/*appended_lsn=*/9, /*n_vcpus=*/8);
|
|
atomic_store(&g_dc.persist.committed_lsn, 4);
|
|
|
|
/* No registered hooks on a candidate; force role to ELECTING. */
|
|
TEST_ASSERT_EQUAL_INT(0, ha_demote_to_standby(&g_dc)); /* clears hooks */
|
|
atomic_store_explicit(&g_dc.ha.role, (int32_t)CTRL_ELECTING,
|
|
memory_order_release);
|
|
|
|
ha_restart_hook = dc_restart_hook;
|
|
ha_fatal_hook = dc_fatal_hook;
|
|
|
|
uint64_t tip_before = g_dc.persist.current_lsn;
|
|
int tasks_before = dc_task_count(&g_dc.delaymgr);
|
|
|
|
/* Act. */
|
|
raft_cb_become_follower_with_cluster_for_test(&g_dc, /*term=*/8);
|
|
|
|
/* Assert. */
|
|
TEST_ASSERT_EQUAL_INT_MESSAGE(tasks_before,
|
|
dc_task_count(&g_dc.delaymgr),
|
|
"demotion from ELECTING must schedule NO convergence task (regression)");
|
|
TEST_ASSERT_EQUAL_UINT64_MESSAGE(tip_before, g_dc.persist.current_lsn,
|
|
"demotion from ELECTING must NOT truncate the WAL (regression)");
|
|
TEST_ASSERT_EQUAL_INT_MESSAGE(0, atomic_load(&g_restart_calls),
|
|
"demotion from ELECTING must NOT self-restart (regression)");
|
|
|
|
dc_teardown();
|
|
printf("test_demotion_from_electing_no_truncation_no_restart: checked\n");
|
|
}
|
|
|
|
/* Regression: demotion from INIT must NOT truncate or restart (mirror of the
|
|
* ELECTING case — a CTRL_INIT node has no registered persistence hooks and no
|
|
* provisional suffix, so the was-PRIMARY convergence branch must not fire). */
|
|
static void test_demotion_from_init_no_truncation_no_restart(void)
|
|
{
|
|
dc_setup("init", /*n_peers=*/3, /*n_standbys=*/2,
|
|
/*appended_lsn=*/9, /*n_vcpus=*/8);
|
|
atomic_store(&g_dc.persist.committed_lsn, 4);
|
|
|
|
/* No registered hooks on a starting node; force role to INIT. */
|
|
TEST_ASSERT_EQUAL_INT(0, ha_demote_to_standby(&g_dc)); /* clears hooks */
|
|
atomic_store_explicit(&g_dc.ha.role, (int32_t)CTRL_INIT,
|
|
memory_order_release);
|
|
|
|
ha_restart_hook = dc_restart_hook;
|
|
ha_fatal_hook = dc_fatal_hook;
|
|
|
|
uint64_t tip_before = g_dc.persist.current_lsn;
|
|
int tasks_before = dc_task_count(&g_dc.delaymgr);
|
|
|
|
/* Act. */
|
|
raft_cb_become_follower_with_cluster_for_test(&g_dc, /*term=*/8);
|
|
|
|
/* Assert. */
|
|
TEST_ASSERT_EQUAL_INT_MESSAGE(tasks_before,
|
|
dc_task_count(&g_dc.delaymgr),
|
|
"demotion from INIT must schedule NO convergence task (regression)");
|
|
TEST_ASSERT_EQUAL_UINT64_MESSAGE(tip_before, g_dc.persist.current_lsn,
|
|
"demotion from INIT must NOT truncate the WAL (regression)");
|
|
TEST_ASSERT_EQUAL_INT_MESSAGE(0, atomic_load(&g_restart_calls),
|
|
"demotion from INIT must NOT self-restart (regression)");
|
|
|
|
dc_teardown();
|
|
printf("test_demotion_from_init_no_truncation_no_restart: checked\n");
|
|
}
|
|
|
|
/* 1.7/2.4 (integration, in-process half): append a committed prefix + an
|
|
* uncommitted suffix, run the demotion seam, then replay the SURVIVING WAL into
|
|
* a FRESH persist context. The replayed state must contain the committed prefix
|
|
* only — provisional entries above committed_lsn must be absent.
|
|
* RED: the demotion seam does not truncate, so the suffix survives into the
|
|
* fresh replay (current_lsn after recovery exceeds committed_lsn + 1). */
|
|
static void test_demotion_replay_yields_committed_only(void)
|
|
{
|
|
dc_setup("replay", /*n_peers=*/1, /*n_standbys=*/0,
|
|
/*appended_lsn=*/0, /*n_vcpus=*/8);
|
|
|
|
/* Build a real on-disk log: priming + a committed prefix + an uncommitted
|
|
* suffix. With n_standbys=0 the sync append returns without majority but
|
|
* the LOCAL WAL write lands (production keeps the entry on replication
|
|
* timeout); we only need the bytes on disk. */
|
|
for (int i = 0; i < 4; i++)
|
|
(void)persist_wal_async(&g_dc.persist, WAL_JOB_UPDATE, "p", 1);
|
|
uint64_t committed_boundary = g_dc.persist.current_lsn - 1; /* committed tip */
|
|
atomic_store(&g_dc.persist.committed_lsn, committed_boundary);
|
|
|
|
/* Uncommitted suffix (entries above the committed boundary). */
|
|
for (int i = 0; i < 3; i++)
|
|
(void)persist_wal_async(&g_dc.persist, WAL_JOB_UPDATE, "u", 1);
|
|
uint64_t tip_before = g_dc.persist.current_lsn - 1;
|
|
TEST_ASSERT_GREATER_THAN_UINT64_MESSAGE(committed_boundary, tip_before,
|
|
"fixture: the uncommitted suffix must sit above the committed boundary");
|
|
|
|
/* Persist the on-disk WAL so a fresh context can replay the same segments. */
|
|
(void)persist_flush(&g_dc.persist);
|
|
|
|
/* Pin the committed boundary deterministically. The fixture wires a LIVE
|
|
* commit engine; on a single node (n_peers=1) the persist durable-advance
|
|
* callback (fsync worker → on_durable_advance) commits the whole durable log,
|
|
* so the persist_flush above can asynchronously race committed_lsn UP from
|
|
* committed_boundary to the appended tip AFTER we set it. The demotion seam
|
|
* reads committed_lsn at task time, so that race would truncate to the tip
|
|
* (not committed_boundary) and break this test on ANY filesystem — it is a
|
|
* fixture commit-engine race, not the overlayfs artifact. Detach the
|
|
* durable-advance commit wake and re-pin committed_lsn so the demotion seam
|
|
* deterministically truncates to committed_boundary. (Test-only: production
|
|
* never demotes with an active auto-committer pushing past the boundary.) */
|
|
g_dc.persist.on_durable_advance = NULL;
|
|
atomic_store(&g_dc.persist.committed_lsn, committed_boundary);
|
|
|
|
/* Capture the workdir BEFORE teardown (the demotion seam restarts/converges
|
|
* the live context; we then boot-recover a fresh persist over the surviving
|
|
* segments using the SAME workdir + name — the boot-recovery contract). */
|
|
char workdir[256];
|
|
snprintf(workdir, sizeof(workdir), "%s", g_dc_workdir);
|
|
|
|
ha_restart_hook = dc_restart_hook;
|
|
ha_fatal_hook = dc_fatal_hook;
|
|
g_restart_hook_rc = 0;
|
|
|
|
/* Act: run the demotion seam (schedules + we drive the convergence task).
|
|
* If the offload flag is ON the truncate itself completes asynchronously
|
|
* on a real slow-lane worker thread shortly after dc_run_pending_task
|
|
* returns, so wait for the restart seam (its
|
|
* last action) before reading the truncate's effect below. */
|
|
raft_cb_become_follower_with_cluster_for_test(&g_dc, /*term=*/7);
|
|
int rc = dc_run_pending_task(&g_dc.delaymgr);
|
|
TEST_ASSERT_NOT_EQUAL_MESSAGE(DC_NO_TASK, rc,
|
|
"demotion must schedule a convergence task that truncates (Req 1.2)");
|
|
TEST_ASSERT_EQUAL_INT_MESSAGE(1, dc_poll_restart_calls(1, 2000),
|
|
"the convergence task must truncate then invoke the restart seam "
|
|
"(bounded poll — the lane worker runs asynchronously)");
|
|
|
|
/* Final assertion — both branches prove the SAME property: the demotion seam
|
|
* truncated the uncommitted suffix down to the committed boundary
|
|
* (current_lsn collapses to committed_boundary + 1).
|
|
*
|
|
* On a REAL fs we run the STRONGER cross-context check: boot-recover a FRESH
|
|
* persist over the surviving WAL and assert the recovered tip is the
|
|
* committed boundary only — the durable-on-disk path the real self-restart
|
|
* (execv) re-enters (Req 1.7).
|
|
*
|
|
* On overlayfs (the sandbox /tmp) the fresh-open-over-just-ftruncate'd-WAL
|
|
* read is incoherent (bug-1128: a fresh fd may see the STALE pre-truncate
|
|
* size and replay the already-removed suffix). This is a sandbox fd/metadata
|
|
* coherence limitation, NOT a product defect, so we SKIP that cross-context
|
|
* step and instead assert the truncate's effect on the LIVE context that
|
|
* actually performed it: persist_truncate_wal_above set
|
|
* g_dc.persist.current_lsn = committed_boundary + 1 under p->lock, so this
|
|
* read is coherent (no fd aliasing) and deterministic. */
|
|
if (dc_path_is_overlayfs(workdir)) {
|
|
printf("test_demotion_replay_yields_committed_only: overlayfs detected "
|
|
"(%s) — SKIPPING cross-context boot-recovery assertion "
|
|
"(bug-1128 sandbox fd-coherence limitation); asserting the "
|
|
"live-context truncate effect instead (the stronger boot-recovery "
|
|
"check runs on a real fs)\n", workdir);
|
|
uint64_t live_tip;
|
|
pthread_mutex_lock(&g_dc.persist.lock);
|
|
live_tip = g_dc.persist.current_lsn;
|
|
pthread_mutex_unlock(&g_dc.persist.lock);
|
|
TEST_ASSERT_TRUE_MESSAGE(
|
|
live_tip <= committed_boundary + 1,
|
|
"the demotion convergence seam must have truncated the live WAL to "
|
|
"the committed boundary ONLY (Req 1.7/2.4): the uncommitted suffix "
|
|
"above committed_lsn must be gone (live-context check; overlayfs)");
|
|
} else {
|
|
/* Real fs: boot-recover a FRESH persist context over the surviving WAL
|
|
* (same workdir + name → same <workdir>/<name>/data/wal segments the
|
|
* demotion seam left). This is the boot-recovery path the real
|
|
* self-restart re-enters (Req 1.7). */
|
|
persist_t *fresh = calloc(1, sizeof(persist_t));
|
|
TEST_ASSERT_NOT_NULL(fresh);
|
|
persist_config_t fcfg = persist_config_defaults();
|
|
fcfg.wal_sync_ms = 5000;
|
|
persist_set_workdir(fresh, workdir, DC_PERSIST_NAME);
|
|
TEST_ASSERT_EQUAL_INT(0, persist_init(fresh, &fcfg, NULL));
|
|
|
|
int recov = persist_recover(fresh);
|
|
TEST_ASSERT_TRUE_MESSAGE(recov >= 0, "boot recovery over surviving WAL");
|
|
|
|
/* Assert (Req 1.7/2.4): the replayed tip is the committed boundary only —
|
|
* provisional suffix entries are absent. */
|
|
TEST_ASSERT_TRUE_MESSAGE(
|
|
fresh->current_lsn <= committed_boundary + 1,
|
|
"boot recovery over the surviving WAL must yield the committed prefix "
|
|
"ONLY (Req 1.7/2.4): the uncommitted suffix must have been truncated "
|
|
"by the demotion convergence seam before restart");
|
|
|
|
persist_stop(fresh);
|
|
persist_fini(fresh);
|
|
free(fresh);
|
|
}
|
|
|
|
dc_teardown();
|
|
printf("test_demotion_replay_yields_committed_only: checked\n");
|
|
}
|
|
|
|
/* ═══════════════════════════════════════════════════════════════════════════
|
|
* xce-audit-invariants controller pass, thread-role violation 1 fix
|
|
* (2026-07-18): ha_demotion_convergence_fn must not block the delaymgr
|
|
* thread — the SAME single thread that drives heartbeats and election
|
|
* timeouts cluster-wide (ha-async-io.md thread-role contract). This test
|
|
* drives dc_run_pending_task (this suite's existing stand-in for "the
|
|
* delaymgr worker's turn to run this task") on a SEPARATE thread and asserts
|
|
* it returns promptly with the offload flag ON, but stalls with it OFF
|
|
* (RED) — proving the offload closes the violation. ha_restart_hook is
|
|
* installed as the park point: it sits at the very end of the (inline or
|
|
* lane) blocking body, so parking there proves the WHOLE body — truncate
|
|
* included — has not yet returned control to whichever thread called it.
|
|
* ═══════════════════════════════════════════════════════════════════════════ */
|
|
|
|
typedef struct {
|
|
pthread_mutex_t mu;
|
|
pthread_cond_t release_cv; /* test broadcasts to release the parked hook */
|
|
pthread_cond_t entered_cv; /* hook broadcasts when it has entered/parked */
|
|
int gate_open;
|
|
_Atomic int entered;
|
|
} dcb_gate_t;
|
|
|
|
static dcb_gate_t g_dcb_gate;
|
|
|
|
static void dcb_gate_init(dcb_gate_t *g)
|
|
{
|
|
pthread_mutex_init(&g->mu, NULL);
|
|
pthread_cond_init(&g->release_cv, NULL);
|
|
pthread_cond_init(&g->entered_cv, NULL);
|
|
g->gate_open = 0;
|
|
atomic_store(&g->entered, 0);
|
|
}
|
|
|
|
static void dcb_gate_destroy(dcb_gate_t *g)
|
|
{
|
|
pthread_mutex_destroy(&g->mu);
|
|
pthread_cond_destroy(&g->release_cv);
|
|
pthread_cond_destroy(&g->entered_cv);
|
|
}
|
|
|
|
static void dcb_gate_open(dcb_gate_t *g)
|
|
{
|
|
pthread_mutex_lock(&g->mu);
|
|
g->gate_open = 1;
|
|
pthread_cond_broadcast(&g->release_cv);
|
|
pthread_mutex_unlock(&g->mu);
|
|
}
|
|
|
|
/* Restart-hook stand-in: park at the gate (simulating the tail of the
|
|
* blocking convergence body — truncate has already run by the time this
|
|
* fires), then report success. */
|
|
static int dcb_gated_restart_hook(cluster_t *c)
|
|
{
|
|
(void)c;
|
|
atomic_fetch_add(&g_restart_calls, 1);
|
|
pthread_mutex_lock(&g_dcb_gate.mu);
|
|
atomic_fetch_add(&g_dcb_gate.entered, 1);
|
|
pthread_cond_broadcast(&g_dcb_gate.entered_cv);
|
|
while (!g_dcb_gate.gate_open)
|
|
pthread_cond_wait(&g_dcb_gate.release_cv, &g_dcb_gate.mu);
|
|
pthread_mutex_unlock(&g_dcb_gate.mu);
|
|
return 0;
|
|
}
|
|
|
|
static int dcb_gate_wait_entered(dcb_gate_t *g, int n, int timeout_ms)
|
|
{
|
|
struct timespec deadline;
|
|
clock_gettime(CLOCK_REALTIME, &deadline);
|
|
deadline.tv_sec += timeout_ms / 1000;
|
|
deadline.tv_nsec += (long)(timeout_ms % 1000) * 1000000L;
|
|
if (deadline.tv_nsec >= 1000000000L) { deadline.tv_sec++; deadline.tv_nsec -= 1000000000L; }
|
|
|
|
pthread_mutex_lock(&g->mu);
|
|
int rc = 0;
|
|
while (atomic_load(&g->entered) < n) {
|
|
rc = pthread_cond_timedwait(&g->entered_cv, &g->mu, &deadline);
|
|
if (rc != 0) break;
|
|
}
|
|
int entered = atomic_load(&g->entered);
|
|
pthread_mutex_unlock(&g->mu);
|
|
return entered >= n ? 0 : -1;
|
|
}
|
|
|
|
/* Worker thread standing in for "the delaymgr worker running this task". */
|
|
typedef struct { delaymgr_t *mgr; _Atomic int done; int rc; } dcb_run_arg_t;
|
|
static void *dcb_run_thread(void *p)
|
|
{
|
|
dcb_run_arg_t *a = (dcb_run_arg_t *)p;
|
|
a->rc = dc_run_pending_task(a->mgr);
|
|
atomic_store(&a->done, 1);
|
|
return NULL;
|
|
}
|
|
|
|
static void dcb_run_offload(int offload_on, const char *label)
|
|
{
|
|
dc_setup("blocking", /*n_peers=*/3, /*n_standbys=*/2,
|
|
/*appended_lsn=*/5, /*n_vcpus=*/8);
|
|
atomic_store(&g_dc.persist.committed_lsn, 3);
|
|
|
|
dcb_gate_init(&g_dcb_gate);
|
|
ha_restart_hook = dcb_gated_restart_hook;
|
|
ha_fatal_hook = dc_fatal_hook;
|
|
ha_set_demotion_offload_for_test(offload_on);
|
|
|
|
/* Schedule the convergence task (does not run it yet). */
|
|
raft_cb_become_follower_with_cluster_for_test(&g_dc, /*term=*/7);
|
|
TEST_ASSERT_EQUAL_INT_MESSAGE(1, dc_task_count(&g_dc.delaymgr),
|
|
"demotion must schedule exactly one convergence task before this "
|
|
"test can drive it");
|
|
|
|
/* Run the scheduled task on a SEPARATE thread — this suite's existing
|
|
* stand-in for the delaymgr worker's turn (dc_run_pending_task). */
|
|
dcb_run_arg_t arg = { .mgr = &g_dc.delaymgr };
|
|
atomic_store(&arg.done, 0);
|
|
pthread_t th;
|
|
pthread_create(&th, NULL, dcb_run_thread, &arg);
|
|
|
|
int done = 0;
|
|
for (int i = 0; i < 200; i++) { /* up to ~2s */
|
|
if (atomic_load(&arg.done)) { done = 1; break; }
|
|
struct timespec ts = { .tv_sec = 0, .tv_nsec = 10 * 1000000L };
|
|
nanosleep(&ts, NULL);
|
|
}
|
|
|
|
if (offload_on) {
|
|
TEST_ASSERT_EQUAL_INT_MESSAGE(1, done,
|
|
"GREEN: with demotion convergence offloaded to the slow lane, "
|
|
"the task body (standing in for the delaymgr thread) must "
|
|
"return promptly even while the restart-seam tail is still "
|
|
"parked on the lane");
|
|
/* The blocking work was actually reached — just on the lane, not
|
|
* the calling thread. */
|
|
TEST_ASSERT_EQUAL_INT_MESSAGE(0,
|
|
dcb_gate_wait_entered(&g_dcb_gate, 1, 1000),
|
|
"GREEN: the offloaded convergence body must still run (on the "
|
|
"lane) and reach the restart-seam park point");
|
|
} else {
|
|
TEST_ASSERT_EQUAL_INT_MESSAGE(0, done,
|
|
"RED: with offload OFF the convergence body runs INLINE, so the "
|
|
"calling (delaymgr-standin) thread blocks at the restart-seam "
|
|
"gate — this is the blocking-on-delaymgr shape the fix removes");
|
|
}
|
|
|
|
dcb_gate_open(&g_dcb_gate);
|
|
pthread_join(th, NULL);
|
|
/* Let the async completion (offload ON) finish before teardown. */
|
|
dc_poll_restart_calls(1, 2000);
|
|
|
|
ha_set_demotion_offload_for_test(0); /* restore production default */
|
|
dcb_gate_destroy(&g_dcb_gate);
|
|
dc_teardown();
|
|
printf("%s: PASS\n", label);
|
|
}
|
|
|
|
static void test_demotion_offload_task_returns_promptly(void)
|
|
{
|
|
dcb_run_offload(1, "test_demotion_offload_task_returns_promptly");
|
|
}
|
|
|
|
static void test_demotion_inline_task_blocks_RED(void)
|
|
{
|
|
dcb_run_offload(0, "test_demotion_inline_task_blocks_RED");
|
|
}
|
|
|
|
/* ════════════════════════════════════════════════════════════════════════════
|
|
* Rejoin reconciliation (ha-convergence-recovery task 3.1 — RED)
|
|
*
|
|
* Requirements (this spec's IDs — see requirements.md):
|
|
* 2.1 — when a standby learns the primary's committed boundary at (re)join and
|
|
* its local log tip EXCEEDS that boundary, it truncates above the boundary
|
|
* and self-restarts ONCE. A second reconcile call in the same process
|
|
* lifetime must NOT restart again (defensive once-guard).
|
|
* 2.2 — the standby must NOT remove entries at/below its own locally known
|
|
* committed_lsn during reconciliation (clamp): the truncation cutoff is
|
|
* max(primary_committed, local committed_lsn). Verified by setting the
|
|
* local committed_lsn ABOVE the reported boundary and asserting the cutoff
|
|
* is the higher local value, NOT the reported boundary.
|
|
* 2.3 — while the local tip does NOT exceed the boundary, the standby joins with
|
|
* NO truncation and NO restart, returning 0.
|
|
* (intake integration) — delivering a CtrlHelloReply through the real cluster.c
|
|
* intake stores last_known_committed_lsn (existing) AND triggers
|
|
* reconciliation.
|
|
*
|
|
* RED status against the current tree: ha_rejoin_reconcile is a no-op scaffold
|
|
* (ha_convergence.c) and the cluster.c CtrlHelloReply intake does NOT call it yet
|
|
* (task 3.2 GREEN wires both). Every case below therefore FAILS until 3.2 lands.
|
|
*
|
|
* Harness: reuses the dc_* fixture (real persist over a tmpdir, restart/fatal
|
|
* seam counters). The fixture comes up CTRL_PRIMARY; rejoin reconciliation is a
|
|
* STANDBY-side concern, so each rejoin test first demotes to STANDBY (which also
|
|
* clears the persist hooks — irrelevant to reconciliation) before exercising it.
|
|
* AAA structure throughout.
|
|
* ════════════════════════════════════════════════════════════════════════════ */
|
|
|
|
/* Set the local on-disk WAL tip to `tip_lsn` (current_lsn = tip_lsn + 1) and the
|
|
* local committed_lsn to `committed`. Mirrors dc_setup's priming convention. */
|
|
static void rj_set_local_state(uint64_t tip_lsn, uint64_t committed)
|
|
{
|
|
pthread_mutex_lock(&g_dc.persist.lock);
|
|
g_dc.persist.current_lsn = tip_lsn + 1;
|
|
pthread_mutex_unlock(&g_dc.persist.lock);
|
|
atomic_store(&g_dc.persist.committed_lsn, committed);
|
|
/* ha-commit-durability 2.2: keep durable_lsn at the primed tip so the
|
|
* commit-majority self-cap matches this in-memory-primed WAL state. */
|
|
atomic_store(&g_dc.persist.durable_lsn, tip_lsn);
|
|
}
|
|
|
|
/* Demote the fixture to STANDBY (the role rejoin reconciliation runs in) and
|
|
* install the restart/fatal seams so the self-restart is observable. */
|
|
static void rj_make_standby_with_seams(void)
|
|
{
|
|
TEST_ASSERT_EQUAL_INT(0, ha_demote_to_standby(&g_dc));
|
|
TEST_ASSERT_EQUAL_INT((int)CTRL_STANDBY,
|
|
(int)atomic_load_explicit(&g_dc.ha.role, memory_order_acquire));
|
|
ha_restart_hook = dc_restart_hook;
|
|
ha_fatal_hook = dc_fatal_hook;
|
|
g_restart_hook_rc = 0; /* model a successful restart */
|
|
}
|
|
|
|
/* ha-term-safety task 3.2: the committed-boundary (watermark) truncate + self-
|
|
* restart is RETIRED. Divergent-suffix reconciliation is now owned by the raft
|
|
* library's (term,lsn) log-matching (raft_on_append_entries_request →
|
|
* on_truncate_from), driven by the leader's AppendEntries — NOT by an LSN
|
|
* watermark on a CtrlHelloReply. ha_rejoin_reconcile therefore no longer
|
|
* truncates the local WAL or self-restarts; it is a no-op that returns 0 while
|
|
* the learned committed boundary is recorded by the caller and the precise
|
|
* truncation happens later via the library AE path. This test pins the RETIRED
|
|
* contract: even with a local tip ABOVE the reported boundary, NO truncation and
|
|
* NO restart occur here. */
|
|
static void test_rejoin_no_watermark_truncate_no_restart(void)
|
|
{
|
|
dc_setup("rjclamp", /*n_peers=*/3, /*n_standbys=*/0,
|
|
/*appended_lsn=*/9, /*n_vcpus=*/8);
|
|
rj_make_standby_with_seams();
|
|
|
|
/* Local tip = 9 (entries 1..9 on disk), local committed_lsn = 6, primary
|
|
* boundary = 4. Pre-3.2 this would have truncated above 6 + restarted; post-
|
|
* 3.2 it must leave the WAL and process untouched (the library reconciles by
|
|
* term when the leader's AE arrives). */
|
|
rj_set_local_state(/*tip_lsn=*/9, /*committed=*/6);
|
|
uint64_t tip_before = g_dc.persist.current_lsn;
|
|
|
|
int rc = ha_rejoin_reconcile(&g_dc, /*primary_committed_lsn=*/4);
|
|
(void)dc_run_pending_task(&g_dc.delaymgr);
|
|
|
|
TEST_ASSERT_EQUAL_INT_MESSAGE(0, rc,
|
|
"ha_rejoin_reconcile is retired to a no-op (task 3.2) and returns 0");
|
|
TEST_ASSERT_EQUAL_UINT64_MESSAGE(tip_before, g_dc.persist.current_lsn,
|
|
"the retired watermark truncate must NOT shrink the local WAL — the "
|
|
"library's (term,lsn) AE reconcile owns truncation now (task 3.2)");
|
|
TEST_ASSERT_EQUAL_INT_MESSAGE(0, atomic_load(&g_restart_calls),
|
|
"the retired rejoin reconcile must NOT self-restart (task 3.2)");
|
|
TEST_ASSERT_EQUAL_INT_MESSAGE(0, atomic_load(&g_fatal_calls),
|
|
"the retired rejoin reconcile must NOT invoke the fatal seam");
|
|
|
|
dc_teardown();
|
|
printf("test_rejoin_no_watermark_truncate_no_restart: checked\n");
|
|
}
|
|
|
|
/* 2.3: local tip AT/BELOW the boundary → no truncation, no restart, returns 0.
|
|
* RED: the no-op stub returns 0 with no side effects, so the no-action assertions
|
|
* PASS but the suite as a whole is RED via the other cases; this case pins the
|
|
* negative contract so 3.2 cannot over-truncate. (It is the one rejoin case that
|
|
* a correct no-op stub already satisfies — kept to lock the boundary for GREEN.) */
|
|
static void test_rejoin_tip_at_or_below_boundary_no_action(void)
|
|
{
|
|
dc_setup("rjnoop", /*n_peers=*/3, /*n_standbys=*/0,
|
|
/*appended_lsn=*/4, /*n_vcpus=*/8);
|
|
rj_make_standby_with_seams();
|
|
|
|
/* Local tip = 4, exactly the primary boundary; nothing to discard. */
|
|
rj_set_local_state(/*tip_lsn=*/4, /*committed=*/4);
|
|
uint64_t tip_before = g_dc.persist.current_lsn;
|
|
|
|
/* Act. */
|
|
int rc = ha_rejoin_reconcile(&g_dc, /*primary_committed_lsn=*/4);
|
|
|
|
/* Assert (Req 2.3): no side effects, returns 0. */
|
|
TEST_ASSERT_EQUAL_INT_MESSAGE(0, rc,
|
|
"rejoin reconcile with tip <= boundary must return 0 (Req 2.3)");
|
|
TEST_ASSERT_EQUAL_UINT64_MESSAGE(tip_before, g_dc.persist.current_lsn,
|
|
"rejoin reconcile with tip <= boundary must NOT truncate (Req 2.3)");
|
|
TEST_ASSERT_EQUAL_INT_MESSAGE(0, atomic_load(&g_restart_calls),
|
|
"rejoin reconcile with tip <= boundary must NOT self-restart (Req 2.3)");
|
|
|
|
dc_teardown();
|
|
printf("test_rejoin_tip_at_or_below_boundary_no_action: checked\n");
|
|
}
|
|
|
|
/* ha-term-safety task 3.2: with the watermark truncate retired, REPEATED rejoin
|
|
* reconcile calls remain side-effect-free — never truncating and never
|
|
* restarting, regardless of how far the local tip runs ahead. (Pre-3.2 this
|
|
* pinned a defensive once-guard around a single restart; post-3.2 there is no
|
|
* restart at all, so any number of calls is a no-op.) */
|
|
static void test_rejoin_repeated_calls_remain_no_op(void)
|
|
{
|
|
dc_setup("rjonce", /*n_peers=*/3, /*n_standbys=*/0,
|
|
/*appended_lsn=*/9, /*n_vcpus=*/8);
|
|
rj_make_standby_with_seams();
|
|
rj_set_local_state(/*tip_lsn=*/9, /*committed=*/4);
|
|
uint64_t tip_before = g_dc.persist.current_lsn;
|
|
|
|
(void)ha_rejoin_reconcile(&g_dc, /*primary_committed_lsn=*/4);
|
|
(void)dc_run_pending_task(&g_dc.delaymgr);
|
|
(void)ha_rejoin_reconcile(&g_dc, /*primary_committed_lsn=*/4);
|
|
(void)dc_run_pending_task(&g_dc.delaymgr);
|
|
|
|
TEST_ASSERT_EQUAL_INT_MESSAGE(0, atomic_load(&g_restart_calls),
|
|
"the retired rejoin reconcile must NEVER self-restart (task 3.2)");
|
|
TEST_ASSERT_EQUAL_UINT64_MESSAGE(tip_before, g_dc.persist.current_lsn,
|
|
"repeated retired rejoin reconcile must leave the local WAL untouched "
|
|
"(task 3.2)");
|
|
|
|
dc_teardown();
|
|
printf("test_rejoin_repeated_calls_remain_no_op: checked\n");
|
|
}
|
|
|
|
/* Intake integration: delivering a CtrlHelloReply through the REAL cluster.c
|
|
* intake (cluster_apply_ctrlhello_reply) stores last_known_committed_lsn AND
|
|
* triggers reconciliation.
|
|
* RED: the intake stores the boundary (passes) but does NOT call
|
|
* ha_rejoin_reconcile yet (task 3.2 wires it), so the restart assertion fails. */
|
|
static void test_ctrlhello_reply_intake_stores_and_reconciles(void)
|
|
{
|
|
dc_setup("rjintake", /*n_peers=*/3, /*n_standbys=*/0,
|
|
/*appended_lsn=*/9, /*n_vcpus=*/8);
|
|
rj_make_standby_with_seams();
|
|
/* Local tip 9 > the boundary the primary will report (4) → reconcile must fire
|
|
* from inside the intake. */
|
|
rj_set_local_state(/*tip_lsn=*/9, /*committed=*/4);
|
|
|
|
const uint64_t reported_committed = 4;
|
|
const uint64_t reported_tag = 77;
|
|
|
|
/* Act: drive the real standby-side CtrlHelloReply intake. */
|
|
cluster_apply_ctrlhello_reply(&g_dc, reported_committed, reported_tag);
|
|
(void)dc_run_pending_task(&g_dc.delaymgr);
|
|
|
|
/* Assert (existing behavior): the boundary + config tag are stored. */
|
|
TEST_ASSERT_EQUAL_UINT64_MESSAGE(reported_committed,
|
|
atomic_load(&g_dc.ha.last_known_committed_lsn),
|
|
"CtrlHelloReply intake must store last_known_committed_lsn (existing)");
|
|
TEST_ASSERT_EQUAL_UINT64_MESSAGE(reported_tag,
|
|
atomic_load(&g_dc.ha.last_known_committed_config_tag),
|
|
"CtrlHelloReply intake must store the config tag (existing)");
|
|
|
|
/* Assert (task 3.2): the intake STILL stores the boundary (above) but the
|
|
* watermark truncate/restart is RETIRED — the intake must NOT self-restart
|
|
* even though the local tip (9) exceeds the reported boundary (4). The
|
|
* library's (term,lsn) AE reconcile owns the divergent-suffix truncation now;
|
|
* the member stays alive and converges when the leader's AppendEntries arrive. */
|
|
TEST_ASSERT_EQUAL_INT_MESSAGE(0, atomic_load(&g_restart_calls),
|
|
"CtrlHelloReply intake must NOT self-restart on a tip-ahead boundary — the "
|
|
"retired watermark reconcile no longer truncates/restarts (task 3.2)");
|
|
TEST_ASSERT_EQUAL_UINT64_MESSAGE(10, g_dc.persist.current_lsn,
|
|
"the intake must leave the local WAL untouched (tip 9 → current_lsn 10); "
|
|
"reconciliation is deferred to the library AE path (task 3.2)");
|
|
|
|
dc_teardown();
|
|
printf("test_ctrlhello_reply_intake_stores_and_reconciles: checked\n");
|
|
}
|
|
|
|
#endif /* XCE_TESTING */
|
|
|
|
/* ── Suite entry point ──────────────────────────────────────────────────── */
|
|
|
|
void test_demotion_convergence(void)
|
|
{
|
|
UnitySetTestFile(__FILE__);
|
|
#ifdef XCE_TESTING
|
|
printf("\n>> demotion convergence + self-restart tests (RED, task 2.1)\n\n");
|
|
|
|
RUN_TEST(test_demotion_from_primary_disables_hooks);
|
|
RUN_TEST(test_demotion_from_primary_resolves_pending_continuations_failed);
|
|
RUN_TEST(test_demotion_concurrent_burst_resolves_all_pending_exactly_once);
|
|
RUN_TEST(test_demotion_schedules_convergence_truncate_and_restart);
|
|
RUN_TEST(test_self_restart_failure_invokes_fatal_hook);
|
|
RUN_TEST(test_demotion_from_standby_no_truncation_no_restart);
|
|
RUN_TEST(test_demotion_from_electing_no_truncation_no_restart);
|
|
RUN_TEST(test_demotion_from_init_no_truncation_no_restart);
|
|
RUN_TEST(test_demotion_replay_yields_committed_only);
|
|
|
|
printf("\n>> demotion-convergence slow-lane offload tests "
|
|
"(xce-audit-invariants controller pass, 2026-07-18)\n\n");
|
|
|
|
RUN_TEST(test_demotion_offload_task_returns_promptly);
|
|
RUN_TEST(test_demotion_inline_task_blocks_RED);
|
|
|
|
printf("\n>> rejoin reconciliation tests (RED, task 3.1)\n\n");
|
|
|
|
RUN_TEST(test_rejoin_no_watermark_truncate_no_restart);
|
|
RUN_TEST(test_rejoin_tip_at_or_below_boundary_no_action);
|
|
RUN_TEST(test_rejoin_repeated_calls_remain_no_op);
|
|
RUN_TEST(test_ctrlhello_reply_intake_stores_and_reconciles);
|
|
#else
|
|
printf("test_demotion_convergence: SKIP (non-test build)\n");
|
|
#endif
|
|
}
|