I wrote:
> ... but this solution is astonishingly ugly. I think we should move up
> the LocalSetXLogInsertAllowed call, instead.
Specifically, I propose this patch instead. I'm not set up to try the
test case though, can you do that?
regards, tom lane
Index: src/backend/access/transam/xlog.c
===================================================================
RCS file: /cvsroot/pgsql/src/backend/access/transam/xlog.c,v
retrieving revision 1.348
diff -c -r1.348 xlog.c
*** src/backend/access/transam/xlog.c 12 Aug 2009 20:53:30 -0000 1.348
--- src/backend/access/transam/xlog.c 26 Aug 2009 14:40:28 -0000
***************
*** 6445,6450 ****
--- 6445,6461 ----
}
/*
+ * An end-of-recovery checkpoint is created before anyone is allowed to
+ * write WAL. To allow us to write the checkpoint record, temporarily
+ * enable XLogInsertAllowed. (This also ensures ThisTimeLineID is
+ * initialized, which we need here and in AdvanceXLInsertBuffer.)
+ */
+ if (flags & CHECKPOINT_END_OF_RECOVERY)
+ LocalSetXLogInsertAllowed();
+
+ checkPoint.ThisTimeLineID = ThisTimeLineID;
+
+ /*
* Compute new REDO record ptr = location of next XLOG record.
*
* NB: this is NOT necessarily where the checkpoint record itself will
be,
***************
*** 6567,6586 ****
START_CRIT_SECTION();
/*
- * An end-of-recovery checkpoint is created before anyone is allowed to
- * write WAL. To allow us to write the checkpoint record, temporarily
- * enable XLogInsertAllowed.
- */
- if (flags & CHECKPOINT_END_OF_RECOVERY)
- LocalSetXLogInsertAllowed();
-
- /*
- * This needs to be done after LocalSetXLogInsertAllowed(), else
- * ThisTimeLineID might still be uninitialized.
- */
- checkPoint.ThisTimeLineID = ThisTimeLineID;
-
- /*
* Now insert the checkpoint record into XLOG.
*/
rdata.data = (char *) (&checkPoint);
--- 6578,6583 ----
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