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feat(ha-prevote): controller candidate-side PreVote orchestration (task 4.1)

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ha.c: raft_cb_send_pre_vote_request (emits preVoteRequest), ha_start_prevote_async
(side-effect-free round + bounded round timeout), pre_vote_reply_dispatch
(raft_on_pre_vote_reply + branch), ha_enter_real_election helper. WON -> truncate
+ CTRL_ELECTING + ha_start_election_async (unchanged real-election path); LOST/
timeout -> stay CTRL_STANDBY + re-arm liveness + log abandonment; PENDING -> no-op.
Round inert until task 4.2 wires triggers; absolute peer-index keyed tally. 6 new
test_ha_prevote tests via reply hook; daemon + suite link clean.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
Rongsong Shen 2026-06-16 05:45:06 +00:00
parent 6f95e4cdfc
commit 7e19bf6110
6 changed files with 801 additions and 1 deletions
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src/controller/meson.build
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@ -121,6 +121,7 @@ controller_unit_test_src = [
'testsuite/test_ha_connection_reuse.c',
'testsuite/test_ha_rdhup_integration.c',
'testsuite/test_ha_liveness.c',
'testsuite/test_ha_prevote.c',
'testsuite/test_commit_engine.c',
'testsuite/test_commit_barrier_rollout.c',
'testsuite/test_commit_barrier_reply.c',