forked from lei.chen/myxce
Rongsong Shen
102e263cce
Two independent call sites duplicated target = max(committed_lsn, last_written): ha.c's heartbeat/stateReport dispatch (repl_ack_decode_and_ dispatch) and config_repl.c's catchup_derive_target (used by the ACK-driven catch-up continuation path). Once config-upgrade-snapshot's marker-triggered checkpoint advances last_written one LSN past an already-committed committed_lsn (the checkpoint's own consumed, never-replicated LSN slot), the unconditional max() permanently wedges every standby's catch-up target at an unreachable value -- the primary re-streams an empty range every heartbeat forever. Extracted the shared, pure ha_compute_repl_target_lsn(committed_lsn, last_written) (ha.h/ha.c), which only falls back to last_written on genuine committed_lsn==0 bootstrap, and pointed both call sites at it so they can never disagree again. Fixing the second call site exposed three pre-existing tests in test_convergence_verification.c that hardcoded the old buggy formula's output as their expected target; updated their fixture values (committed_lsn 4->9, matching appended_lsn) to decouple them from the now-fixed edge case, which already has dedicated pure-function coverage in test_ha_role.c. GREEN: full controller_unit_test suite = 1040 tests, 0 failures, clean across multiple runs. Live-verified via run-ha-soak.sh --config-upgrade-wal-trim (18 jobs, zero job loss, ctrl-1 reconverged 3-of-3 using the preserved floor segment) -- unblocks config-upgrade-snapshot task 8.9. |
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