diff options
| author | Alexander Korotkov | 2025-06-23 18:27:42 +0000 |
|---|---|---|
| committer | Alexander Korotkov | 2025-06-23 18:27:42 +0000 |
| commit | 70d8a91f82f19d270facd25bb6292a949773dfce (patch) | |
| tree | e4f4f44cf5a1482d74b6f286be42b56553fe2d80 | |
| parent | ccd5bc93fdfeae22c935f405b0687be5cfa9caa4 (diff) | |
Remove excess assert from InvalidatePossiblyObsoleteSlot()
ca307d5cec90 introduced keeping WAL segments by slot's last saved restart LSN.
It also added an assertion that the slot's restart LSN never goes backward.
However, situations when the restart LSN goes backward have been spotted by
buildfarm animals and investigated in the thread.
When pg_receivewal starts the replication, it sets the last replayed LSN to
the beginning of the segment, which is older than what
ReplicationSlotReserveWal() set for the slot. A similar situation can happen
to pg_basebackup. When standby reconnects to the primary, it sends the last
replayed LSN, which might be older than the last confirmed flush LSN. In
both these situations, a concurrent checkpoint may trigger an assert trap.
Based on ideas from Vitaly Davydov <[email protected]>,
Hayato Kuroda (Fujitsu) <[email protected]>,
Vignesh C <[email protected]>,
Amit Kapila <[email protected]>.
Reported-by: Vignesh C <[email protected]>
Reported-by: Tom Lane <[email protected]>
Discussion: https://postgr.es/m/CALDaNm3s-jpQTe1MshsvQ8GO%3DTLj233JCdkQ7uZ6pwqRVpxAdw%40mail.gmail.com
Reviewed-by: Vignesh C <[email protected]>
Reviewed-by: Amit Kapila <[email protected]>
| -rw-r--r-- | src/backend/replication/slot.c | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/src/backend/replication/slot.c b/src/backend/replication/slot.c index c64f020742f..c11e588d632 100644 --- a/src/backend/replication/slot.c +++ b/src/backend/replication/slot.c @@ -1810,8 +1810,6 @@ InvalidatePossiblyObsoleteSlot(uint32 possible_causes, */ SpinLockAcquire(&s->mutex); - Assert(s->data.restart_lsn >= s->last_saved_restart_lsn); - restart_lsn = s->data.restart_lsn; /* we do nothing if the slot is already invalid */ |