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Fix possible recovery trouble if TRUNCATE overlaps a checkpoint.

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If TRUNCATE causes some buffers to be invalidated and thus the
checkpoint does not flush them, TRUNCATE must also ensure that the
corresponding files are truncated on disk. Otherwise, a replay
from the checkpoint might find that the buffers exist but have
the wrong contents, which may cause replay to fail.

Report by Teja Mupparti. Patch by Kyotaro Horiguchi, per a design
suggestion from Heikki Linnakangas, with some changes to the
comments by me. Review of this and a prior patch that approached
the issue differently by Heikki Linnakangas, Andres Freund, Álvaro
Herrera, Masahiko Sawada, and Tom Lane.

Discussion: http://postgr.es/m/BYAPR06MB6373BF50B469CA393C614257ABF00@BYAPR06MB6373.namprd06.prod.outlook.com
This commit is contained in:
Robert Haas
2022-03-24 14:32:06 -04:00
parent 86459b3296
commit 412ad7a556
11 changed files with 120 additions and 28 deletions
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6
src/backend/access/transam/multixact.c
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@@ -3088,8 +3088,8 @@ TruncateMultiXact(MultiXactId newOldestMulti, Oid newOldestMultiDB)
* crash/basebackup, even though the state of the data directory would
* require it.
*/
Assert(!MyProc->delayChkpt);
MyProc->delayChkpt = true;
Assert((MyProc->delayChkpt & DELAY_CHKPT_START) == 0);
MyProc->delayChkpt |= DELAY_CHKPT_START;
/* WAL log truncation */
WriteMTruncateXlogRec(newOldestMultiDB,
@@ -3115,7 +3115,7 @@ TruncateMultiXact(MultiXactId newOldestMulti, Oid newOldestMultiDB)
/* Then offsets */
PerformOffsetsTruncation(oldestMulti, newOldestMulti);
MyProc->delayChkpt = false;
MyProc->delayChkpt &= ~DELAY_CHKPT_START;
END_CRIT_SECTION();
LWLockRelease(MultiXactTruncationLock);