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Fix bug in %r handling in recovery_end_command, it always came out as 0

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because InRedo was cleared before recovery_end_command was executed.
Also, always take ControlFileLock when reading checkpoint location for
%r. That didn't matter before, but in 8.4 bgwriter is active during
recovery and can modify the control file concurrently.
This commit is contained in:
Heikki Linnakangas 2010-03-18 09:18:54 +00:00
parent c487a9540c
commit 9c563b6fd0
1 changed files with 10 additions and 22 deletions
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22
src/backend/access/transam/xlog.c
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@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2009, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/backend/access/transam/xlog.c,v 1.345.2.7 2010/02/19 01:04:39 itagaki Exp $
* $PostgreSQL: pgsql/src/backend/access/transam/xlog.c,v 1.345.2.8 2010/03/18 09:18:54 heikki Exp $
*
*-------------------------------------------------------------------------
*/
@ -2711,11 +2711,13 @@ RestoreArchivedFile(char *path, const char *xlogfname,
*/
if (InRedo)
{
LWLockAcquire(ControlFileLock, LW_SHARED);
XLByteToSeg(ControlFile->checkPointCopy.redo,
restartLog, restartSeg);
XLogFileName(lastRestartPointFname,
ControlFile->checkPointCopy.ThisTimeLineID,
restartLog, restartSeg);
LWLockRelease(ControlFileLock);
/* we shouldn't need anything earlier than last restart point */
Assert(strcmp(lastRestartPointFname, xlogfname) <= 0);
}
@ -2905,28 +2907,14 @@ ExecuteRecoveryEndCommand(void)
* Calculate the archive file cutoff point for use during log shipping
* replication. All files earlier than this point can be deleted from the
* archive, though there is no requirement to do so.
*
* We initialise this with the filename of an InvalidXLogRecPtr, which
* will prevent the deletion of any WAL files from the archive because of
* the alphabetic sorting property of WAL filenames.
*
* Once we have successfully located the redo pointer of the checkpoint
* from which we start recovery we never request a file prior to the redo
* pointer of the last restartpoint. When redo begins we know that we have
* successfully located it, so there is no need for additional status
* flags to signify the point when we can begin deleting WAL files from
* the archive.
*/
if (InRedo)
{
LWLockAcquire(ControlFileLock, LW_SHARED);
XLByteToSeg(ControlFile->checkPointCopy.redo,
restartLog, restartSeg);
XLogFileName(lastRestartPointFname,
ControlFile->checkPointCopy.ThisTimeLineID,
restartLog, restartSeg);
}
else
XLogFileName(lastRestartPointFname, 0, 0, 0);
LWLockRelease(ControlFileLock);
/*
* construct the command to be executed