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Commit83cb7da

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Fix bug in wasender's xlogid boundary handling, reported by Erik Rijkers.
LogwrtRqst.Write can be set to non-existent FF log segment, we mustn'ttry to send that in XLogSend().Also fix similar bug in ReadRecord(), which I just introduced in theReadRecord() refactoring patch.
1 parent1bb2558 commit83cb7da

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2 files changed

+21
-5
lines changed

2 files changed

+21
-5
lines changed

‎src/backend/access/transam/xlog.c

Lines changed: 7 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -7,7 +7,7 @@
77
* Portions Copyright (c) 1996-2010, PostgreSQL Global Development Group
88
* Portions Copyright (c) 1994, Regents of the University of California
99
*
10-
* $PostgreSQL: pgsql/src/backend/access/transam/xlog.c,v 1.362 2010/01/2715:27:50 heikki Exp $
10+
* $PostgreSQL: pgsql/src/backend/access/transam/xlog.c,v 1.363 2010/01/2716:41:09 heikki Exp $
1111
*
1212
*-------------------------------------------------------------------------
1313
*/
@@ -3574,6 +3574,12 @@ ReadRecord(XLogRecPtr *RecPtr, int emode_arg, bool fetching_ckpt)
35743574
NextLogPage(tmpRecPtr);
35753575
/* We will account for page header size below */
35763576
}
3577+
3578+
if (tmpRecPtr.xrecoff >=XLogFileSize)
3579+
{
3580+
(tmpRecPtr.xlogid)++;
3581+
tmpRecPtr.xrecoff=0;
3582+
}
35773583
}
35783584
else
35793585
{

‎src/backend/replication/walsender.c

Lines changed: 14 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -30,7 +30,7 @@
3030
*
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*
3232
* IDENTIFICATION
33-
* $PostgreSQL: pgsql/src/backend/replication/walsender.c,v 1.3 2010/01/21 08:19:57 heikki Exp $
33+
* $PostgreSQL: pgsql/src/backend/replication/walsender.c,v 1.4 2010/01/27 16:41:09 heikki Exp $
3434
*
3535
*-------------------------------------------------------------------------
3636
*/
@@ -610,8 +610,8 @@ XLogSend(StringInfo outMsg)
610610
return true;
611611

612612
/*
613-
* We gather multiple records together by issuing just oneread() of
614-
* a suitable size, and send them as one CopyData message. Repeat
613+
* We gather multiple records together by issuing just oneXLogRead()
614+
*ofa suitable size, and send them as one CopyData message. Repeat
615615
* until we've sent everything we can.
616616
*/
617617
while (XLByteLT(sentPtr,SendRqstPtr))
@@ -628,11 +628,21 @@ XLogSend(StringInfo outMsg)
628628
* The rounding is not only for performance reasons. Walreceiver
629629
* relies on the fact that we never split a WAL record across two
630630
* messages. Since a long WAL record is split at page boundary into
631-
* continuation records, page boundary isalwayssafe cut-off point.
631+
* continuation records, page boundary isalways a safe cut-off point.
632632
* We also assume that SendRqstPtr never points in the middle of a
633633
* WAL record.
634634
*/
635635
startptr=sentPtr;
636+
if (startptr.xrecoff >=XLogFileSize)
637+
{
638+
/*
639+
* crossing a logid boundary, skip the non-existent last log
640+
* segment in previous logical log file.
641+
*/
642+
startptr.xlogid+=1;
643+
startptr.xrecoff=0;
644+
}
645+
636646
endptr=startptr;
637647
XLByteAdvance(endptr,MAX_SEND_SIZE);
638648
/* round down to page boundary. */

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