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Fix some serious bugs in archive recovery, now that bgwriter is active
during it: When bgwriter is active, the startup process can't perform mdsync() correctly because it won't see the fsync requests accumulated in bgwriter's private pendingOpsTable. Therefore make bgwriter responsible for the end-of-recovery checkpoint as well, when it's active. When bgwriter is active (= archive recovery), the startup process must not accumulate fsync requests to its own pendingOpsTable, since bgwriter won't see them there when it performs restartpoints. Make startup process drop its pendingOpsTable when bgwriter is launched to avoid that. Update minimum recovery point one last time when leaving archive recovery. It won't be updated by the end-of-recovery checkpoint because XLogFlush() sees us as out of recovery already. This fixes bug #4879 reported by Fujii Masao.
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@@ -6,7 +6,7 @@
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* Portions Copyright (c) 1996-2009, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $PostgreSQL: pgsql/src/include/access/xlog.h,v 1.91 2009/02/18 15:58:41 heikki Exp $
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* $PostgreSQL: pgsql/src/include/access/xlog.h,v 1.92 2009/06/25 21:36:00 heikki Exp $
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*/
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#ifndef XLOG_H
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#define XLOG_H
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@@ -166,6 +166,8 @@ extern bool XLOG_DEBUG;
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/* These indicate the cause of a checkpoint request */
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#define CHECKPOINT_CAUSE_XLOG 0x0010 /* XLOG consumption */
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#define CHECKPOINT_CAUSE_TIME 0x0020 /* Elapsed time */
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#define CHECKPOINT_END_OF_RECOVERY 0x0040 /* Like shutdown checkpoint, but
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* issued at end of WAL recovery */
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/* Checkpoint statistics */
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typedef struct CheckpointStatsData
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