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feat(ha-convergence-recovery): self-restart primitive + demotion convergence (task 2.2)

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This commit is contained in:
Rongsong Shen 2026-06-14 03:47:12 +00:00
parent c8e55947c2
commit 09103a3141
7 changed files with 337 additions and 43 deletions
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24
src/controller/persist.c
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@ -1597,6 +1597,30 @@ int persist_truncate_wal_above(persist_t* p, uint64_t cutoff_lsn)
}
if (cutoff_seg_idx < 0) {
/* cutoff_lsn is below the oldest retained segment's start LSN, so EVERY
* on-disk entry has LSN > cutoff_lsn and must be removed (the function's
* contract: "remove all entries with LSN > cutoff_lsn"). This is the
* demotion-convergence case (ha-convergence-recovery Req 1.2): a demoted
* ex-primary whose committed boundary sits below its entire retained log
* must discard all of it and collapse the tip to cutoff_lsn + 1. Delete
* every segment, close the active fd, and reset the in-memory tip. */
for (int i = 0; i < nseg; i++) {
char del_path[4096];
snprintf(del_path, sizeof(del_path),
WAL_SEG_FMT, p->wal_path, seg_lsns[i]);
unlink(del_path);
}
if (p->wal_fd >= 0) {
fdatasync(p->wal_fd);
close(p->wal_fd);
p->wal_fd = -1;
}
p->seg_offset = 0;
p->seg_path[0] = '\0';
p->current_lsn = cutoff_lsn + 1;
p->last_crc = WAL_CRC_NONE;
atomic_store_explicit(&p->committed_lsn, cutoff_lsn,
memory_order_release);
pthread_mutex_unlock(&p->lock);
return 0;
}