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feat(ha-repl-hardening): unified replication decision loop (task 3.2)

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ha_evaluate_repl_action() pure function: stale tag→PUSH_CONFIG,
lsn<oldest_wal→SEND_SNAPSHOT, lsn<committed→STREAM_WAL, else CONVERGED.
5 tests. Fixed misleading stream_wal_from_zero test name per review.
This commit is contained in:
Rongsong Shen 2026-06-04 16:58:48 +00:00
parent aab41fa609
commit a475ef621f
4 changed files with 176 additions and 1 deletions
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35
src/controller/ha.c
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@ -934,6 +934,41 @@ void ha_nop_reply_state_report(ha_state_t *ha, myconf_t *myconf,
reply_out->data.state_report = sr;
}
/*
* ha_evaluate_repl_action — pure decision function for the unified heartbeat-
* driven replication protocol.
*
* Implements the decision tree from the ha-repl-hardening design:
*
* if standby_tag < committed_tag → HA_REPL_PUSH_CONFIG
* elif standby_lsn < oldest_wal_lsn → HA_REPL_SEND_SNAPSHOT
* elif standby_lsn < committed_lsn → HA_REPL_STREAM_WAL
* else (tag >= committed AND lsn >= committed) → HA_REPL_CONVERGED
*
* No side effects. All callers must use the returned action to drive the
* replication send; they must not cache the result beyond the current cycle.
*
* Requirements: 2.2, 2.3, 2.4 (ha-repl-hardening spec)
* Boundary: Primary Heartbeat Handler (ha.c)
*/
ha_repl_action_t ha_evaluate_repl_action(uint64_t standby_tag,
uint64_t standby_lsn,
uint64_t committed_tag,
uint64_t committed_lsn,
uint64_t oldest_wal_lsn)
{
if (standby_tag < committed_tag)
return HA_REPL_PUSH_CONFIG;
if (standby_lsn < oldest_wal_lsn)
return HA_REPL_SEND_SNAPSHOT;
if (standby_lsn < committed_lsn)
return HA_REPL_STREAM_WAL;
return HA_REPL_CONVERGED;
}
/*
* ha_process_standby_state — update per-standby convergence tracking.
*