database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-06-16 06:01:02 +03:00
Code Activity

Fix possible recovery trouble if TRUNCATE overlaps a checkpoint.

Browse Source 
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
Download Patch File Download Diff File Expand all files Collapse all files

6
src/backend/storage/buffer/bufmgr.c
View File

@ -3911,7 +3911,9 @@ MarkBufferDirtyHint(Buffer buffer, bool buffer_std)
* essential that CreateCheckPoint waits for virtual transactions
* rather than full transactionids.
*/
MyProc->delayChkpt = delayChkpt = true;
Assert((MyProc->delayChkpt & DELAY_CHKPT_START) == 0);
MyProc->delayChkpt |= DELAY_CHKPT_START;
delayChkpt = true;
lsn = XLogSaveBufferForHint(buffer, buffer_std);
}
@ -3944,7 +3946,7 @@ MarkBufferDirtyHint(Buffer buffer, bool buffer_std)
UnlockBufHdr(bufHdr, buf_state);
if (delayChkpt)
MyProc->delayChkpt = false;
MyProc->delayChkpt &= ~DELAY_CHKPT_START;
if (dirtied)
{