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obs(ha-term-safety): promote committed_lsn advance to INFO + harness polls authoritative commit signal

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The commit-engine committed_lsn advance was TRACE-only; promoted to INFO (fires only
on a real advance, not noisy) so operators/tests can observe the authoritative primary
committed watermark. The clean-failover harness now polls this 'commit: committed_lsn
N -> M' line (not the lagging ha_process_standby_state heartbeat) with generous catch-up
headroom.

This made the live RED->GREEN visible: with Option A, committed_lsn reaches 5 on a
stable cluster ('jobs committed on a majority (committed_lsn=5 >= 5)') even via catch-up
delivery — the commit-stall is fixed.
This commit is contained in:
Rongsong Shen 2026-06-23 00:28:14 +00:00
parent 83fbed2370
commit 9e5e293605
2 changed files with 18 additions and 8 deletions
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9
src/controller/commit.c
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@ -181,8 +181,13 @@ static void commit_advance_locked(commit_engine_t* ce)
#endif
atomic_store(&ce->p->committed_lsn, cand);
TRACE("commit: committed_lsn %lu -> %lu (n_peers=%d)", cur, cand,
ce->n_peers);
/* INFO (not TRACE): the authoritative primary committed_lsn advance. Fires
* only on a real advance (monotonic guard above), so it is not noisy, and it
* is the canonical operator/test signal for the committed watermark — the
* standby-reported committed_lsn in ha_process_standby_state heartbeats lags
* and only logs on the one-time converged transition. */
INFO("commit: committed_lsn %lu -> %lu (n_peers=%d)", cur, cand,
ce->n_peers);
pthread_cond_broadcast(&ce->cond);
}