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Fix incomplete backpatch of pg_multixact truncation changes to <= 9.2

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The backpatch of a95335b544d9c8377e9dc7a399d8e9a155895f82 to 9.2, 9.1
and 9.0 was incomplete, missing changes to xlog.c, primarily the call
to TrimMultiXact(). Testing presumably didn't show a problem without
these changes because TrimMultiXact() performs defense-in-depth work,
which is not strictly necessary.

It also missed moving StartupMultiXact() which would have been
problematic if a restartpoing happened in exactly the wrong moment,
causing a transient error.

Andres Freund
This commit is contained in:
Alvaro Herrera
2013-12-02 13:28:10 -03:00
parent 8269e4091c
commit 3d974e303d
2 changed files with 11 additions and 3 deletions
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13
src/backend/access/transam/xlog.c
View File

@ -5991,6 +5991,12 @@ StartupXLOG(void)
XLogCtl->ckptXidEpoch = checkPoint.nextXidEpoch;
XLogCtl->ckptXid = checkPoint.nextXid;
/*
* Startup MultiXact. We need to do this early because we need its state
* initialized because we attempt truncation during restartpoints.
*/
StartupMultiXact();
/*
* We must replay WAL entries using the same TimeLineID they were created
* under, so temporarily adopt the TLI indicated by the checkpoint (see
@ -6121,8 +6127,9 @@ StartupXLOG(void)
ProcArrayInitRecovery(ShmemVariableCache->nextXid);
/*
* Startup commit log and subtrans only. Other SLRUs are not
* maintained during recovery and need not be started yet.
* Startup commit log and subtrans only. MultiXact has already
* been started up and other SLRUs are not maintained during
* recovery and need not be started yet.
*/
StartupCLOG();
StartupSUBTRANS(oldestActiveXID);
@ -6593,7 +6600,7 @@ StartupXLOG(void)
/*
* Perform end of recovery actions for any SLRUs that need it.
*/
StartupMultiXact();
TrimMultiXact();
TrimCLOG();
/* Reload shared-memory state for prepared transactions */

1
src/include/access/multixact.h
View File

@ -59,6 +59,7 @@ extern Size MultiXactShmemSize(void);
extern void MultiXactShmemInit(void);
extern void BootStrapMultiXact(void);
extern void StartupMultiXact(void);
extern void TrimMultiXact(void);
extern void ShutdownMultiXact(void);
extern void MultiXactGetCheckptMulti(bool is_shutdown,
MultiXactId *nextMulti,