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| author | Robert Haas <rhaas@postgresql.org> | 2021-01-27 15:52:34 -0500 |
|---|---|---|
| committer | Robert Haas <rhaas@postgresql.org> | 2021-01-27 15:52:34 -0500 |
| commit | 69059d3b2f0754c8e661ba479f7121e6631cdf4a (patch) | |
| tree | 95dc06a4c6dedacb3d782d52dc69ad8f07eff42f /src/backend/access/transam/clog.c | |
| parent | 0fcc2decd485a61321a3220d8f76cb108b082009 (diff) | |
| download | postgresql-69059d3b2f0754c8e661ba479f7121e6631cdf4a.tar.gz postgresql-69059d3b2f0754c8e661ba479f7121e6631cdf4a.zip | |
In TrimCLOG(), don't reset XactCtl->shared->latest_page_number.
Since the CLOG page number is not recorded directly in the checkpoint
record, we have to use ShmemVariableCache->nextXid to figure out the
latest CLOG page number at the start of recovery. However, as recovery
progresses, replay of CLOG/EXTEND records will update our notion of
the latest page number, and we should rely on that being accurate
rather than recomputing the value based on an updated notion of
nextXid. ShmemVariableCache->nextXid is only an approximation
during recovery anyway, whereas CLOG/EXTEND records are an
authoritative representation of how the SLRU has been updated.
Commit 0fcc2decd485a61321a3220d8f76cb108b082009 makes this
simplification possible, as before that change clog_redo() might
have injected a bogus value here, and we'd want to get rid of
that before entering normal running.
Patch by me, reviewed by Heikki Linnakangas.
Discussion: http://postgr.es/m/CA+TgmoZYig9+AQodhF5sRXuKkJ=RgFDugLr3XX_dz_F-p=TwTg@mail.gmail.com
Diffstat (limited to 'src/backend/access/transam/clog.c')
| -rw-r--r-- | src/backend/access/transam/clog.c | 5 |
1 files changed, 0 insertions, 5 deletions
diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c index 5ae962b86e1..6fa4713fb4d 100644 --- a/src/backend/access/transam/clog.c +++ b/src/backend/access/transam/clog.c @@ -774,11 +774,6 @@ TrimCLOG(void) LWLockAcquire(XactSLRULock, LW_EXCLUSIVE); /* - * Re-Initialize our idea of the latest page number. - */ - XactCtl->shared->latest_page_number = pageno; - - /* * Zero out the remainder of the current clog page. Under normal * circumstances it should be zeroes already, but it seems at least * theoretically possible that XLOG replay will have settled on a nextXID |