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Reduce severity of 'XLogFlush: request is not satisfied' error condition,

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per my proposal of a couple days ago.  This will eliminate the unable-
to-restart-database class of problem that we have seen reported half a
dozen times with 7.1.*.
This commit is contained in:
Tom Lane 2002-01-14 17:55:57 +00:00
parent eab6776358
commit 2004337785
1 changed files with 30 additions and 5 deletions
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35
src/backend/access/transam/xlog.c
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@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Header: /cvsroot/pgsql/src/backend/access/transam/xlog.c,v 1.85 2001/12/28 18:16:41 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/access/transam/xlog.c,v 1.86 2002/01/14 17:55:57 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -1262,15 +1262,40 @@ XLogFlush(XLogRecPtr record)
WriteRqst.Write = WriteRqstPtr;
WriteRqst.Flush = record;
XLogWrite(WriteRqst);
if (XLByteLT(LogwrtResult.Flush, record))
elog(STOP, "XLogFlush: request %X/%X is not satisfied --- flushed only to %X/%X",
record.xlogid, record.xrecoff,
LogwrtResult.Flush.xlogid, LogwrtResult.Flush.xrecoff);
}
LWLockRelease(WALWriteLock);
}
END_CRIT_SECTION();
/*
* If we still haven't flushed to the request point then we have a
* problem; most likely, the requested flush point is past end of XLOG.
* This has been seen to occur when a disk page has a corrupted LSN.
*
* Formerly we treated this as a STOP condition, but that hurts the
* system's robustness rather than helping it: we do not want to take
* down the whole system due to corruption on one data page. In
* particular, if the bad page is encountered again during recovery then
* we would be unable to restart the database at all! (This scenario
* has actually happened in the field several times with 7.1 releases.
* Note that we cannot get here while InRedo is true, but if the bad
* page is brought in and marked dirty during recovery then
* CreateCheckpoint will try to flush it at the end of recovery.)
*
* The current approach is to ERROR under normal conditions, but only
* NOTICE during recovery, so that the system can be brought up even if
* there's a corrupt LSN. Note that for calls from xact.c, the ERROR
* will be promoted to STOP since xact.c calls this routine inside a
* critical section. However, calls from bufmgr.c are not within
* critical sections and so we will not force a restart for a bad LSN
* on a data page.
*/
if (XLByteLT(LogwrtResult.Flush, record))
elog(InRecovery ? NOTICE : ERROR,
"XLogFlush: request %X/%X is not satisfied --- flushed only to %X/%X",
record.xlogid, record.xrecoff,
LogwrtResult.Flush.xlogid, LogwrtResult.Flush.xrecoff);
}
/*