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feat(ha-election): per-priority failover election stagger + prevote dispatch-gate

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Desync FAILOVER re-elections by node priority (ha_election_stagger_ms /
ha_failover_stagger_fn) mirroring the startup stagger, with seed jitter and
async prevote start; allow prevote in voter roles through the dispatch gate.
Adds HA role and vote-gate tests (stagger desync by priority, prevote on dead
primary, stickiness-lapse grants).

Pre-existing uncommitted work, committed to establish a clean baseline before
ha-commit-durability implementation.
This commit is contained in:
Rongsong Shen 2026-06-18 04:16:54 +00:00
parent 223e1b8578
commit 749e194207
5 changed files with 238 additions and 2 deletions
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12
src/controller/ha.h
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@ -837,6 +837,18 @@ void ha_start_prevote_async(ha_state_t *ha, cluster_t *c);
*/
void ha_begin_failover(ha_state_t *ha, cluster_t *c);
/*
* ha_election_stagger_ms: per-node desync delay (ms) for a FAILOVER re-election.
*
* Mirrors the startup stagger (myapp.c): my_priority * election_priority_step_ms
* plus a fresh random jitter in [0, election_jitter_max_ms]. Applied before the
* PreVote start on the failover path so two survivors that lose the primary at
* the same instant do not campaign in lock-step and split the vote forever
* (Raft §5.2 randomized election timeout; bug-606). Re-randomized each call —
* the jitter_seed advances — so repeated collisions still converge.
*/
uint32_t ha_election_stagger_ms(ha_state_t *ha);
/*
* ha_dispatch_repl_action_for_standby: evaluate the replication decision for
* one standby and execute the resulting action.