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feat(ha-commit-durability): durable-backed vote/PreVote freshness floor + bare-durable candidate advertise (task 4.2)

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Rongsong Shen 2026-06-18 09:02:11 +00:00
parent 4b7457144c
commit 3049b620f3
7 changed files with 282 additions and 26 deletions
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14
src/controller/ha.h
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@ -678,6 +678,20 @@ void ha_vote_self_freshness(ha_state_t *ha,
uint64_t *out_tag,
uint64_t *out_lsn);
/*
* ha_candidate_advertise_lsn: the LSN a candidate advertises in a RequestVote /
* PreVote payload (ha-commit-durability task 4.2).
*
* Returns the BARE durable WAL tip persist_durable_floor(p) — NOT the folded
* max(durable_floor, last_known_committed_lsn) ha_vote_self_freshness computes
* for the voter floor. A candidate may only claim a log position it can
* durably back, so a node restarted with a truncated log cannot over-advertise
* a stale volatile learned-committed value and win (design §1a/§5a). The
* candidate's TAG axis still uses ha_vote_self_freshness (config epoch is
* orthogonal to log durability). NULL-safe (→ 0).
*/
uint64_t ha_candidate_advertise_lsn(persist_t *p);
/*
* ha_elect_evaluate_and_signal: evaluate accumulated ha_elect_ctx_t votes.
* Sets ctx->result (1=primary, 0=standby) and posts ctx->done semaphore.