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feat(ha-repl-hardening): safe_committed_lsn from vote replies (task 4.1)

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- Add ha_compute_safe_committed_lsn() in ha.c: collects LSNs from
  granted voters (self + peers), sorts descending, picks index
  floor(n_granted/2) for majority-threshold value
- Wire into raft_cb_become_leader: compute safe_lsn/safe_tag from
  ha->elect_ctx after winning election, call persist_truncate_wal_above
- Four unit tests in test_ha_evaluate_committing.c:
  voters [99,100]+self=100 → 100; voters [50,51]+self=100 → 51;
  single-node → 0; denied voter excluded → self-only
This commit is contained in:
Rongsong Shen 2026-06-05 02:41:22 +00:00
parent 18ad3e9c9f
commit e7919304c3
4 changed files with 314 additions and 1 deletions
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.kiro/specs/ha-repl-hardening/tasks.md
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@ -147,7 +147,7 @@
---
- [ ] 4. Post-election safety: Safe commit point from vote replies
- [ ] 4.1 Determine `safe_committed_lsn` from vote replies in `raft_cb_become_leader`
- [x] 4.1 Determine `safe_committed_lsn` from vote replies in `raft_cb_become_leader`
- `ha_elect_ctx_t.votes[]` is already populated by the vote reply handler (`peerLastLogLsn`, `peerConfigTag` per voter); this task reads those fields after winning election
- Compute `safe_committed_lsn` = max LSN held by a majority of voters (iterate all voters with `granted=true`)
- Compute `safe_config_tag` from `peerConfigTag` using the same majority logic