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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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4
src/backend/storage/lmgr/proc.c
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@@ -393,7 +393,7 @@ InitProcess(void)
MyProc->roleId = InvalidOid;
MyProc->tempNamespaceId = InvalidOid;
MyProc->isBackgroundWorker = IsBackgroundWorker;
MyProc->delayChkpt = false;
MyProc->delayChkpt = 0;
MyProc->statusFlags = 0;
/* NB -- autovac launcher intentionally does not set IS_AUTOVACUUM */
if (IsAutoVacuumWorkerProcess())
@@ -578,7 +578,7 @@ InitAuxiliaryProcess(void)
MyProc->roleId = InvalidOid;
MyProc->tempNamespaceId = InvalidOid;
MyProc->isBackgroundWorker = IsBackgroundWorker;
MyProc->delayChkpt = false;
MyProc->delayChkpt = 0;
MyProc->statusFlags = 0;
MyProc->lwWaiting = false;
MyProc->lwWaitMode = 0;