docs(ha-commit-durability): root-cause findings for failover committed-job loss (bug-828)

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WAL-byte decode proves REAL data loss (not commit-index): committed prefix
entries physically absent from live nodes (ctrl-2 WAL starts LSN 16, ctrl-3 LSN
13), present only on the down node. Mechanism: empty-rejoin catch-up streams
[watermark..committed] not [1..], no snapshot to backfill the prefix -> permanent
gap. Predates libxce-failover. Full findings + open forks + xce_test waldump
tooling plan in INVESTIGATION-failover-job-loss.md. Not yet fixed.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

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Rongsong Shen 2026-06-20 13:51:40 +00:00

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