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Introduce wal_level GUC to explicitly control if information needed for
archival or hot standby should be WAL-logged, instead of deducing that from other options like archive_mode. This replaces recovery_connections GUC in the primary, where it now has no effect, but it's still used in the standby to enable/disable hot standby. Remove the WAL-logging of "unlogged operations", like creating an index without WAL-logging and fsyncing it at the end. Instead, we keep a copy of the wal_mode setting and the settings that affect how much shared memory a hot standby server needs to track master transactions (max_connections, max_prepared_xacts, max_locks_per_xact) in pg_control. Whenever the settings change, at server restart, write a WAL record noting the new settings and update pg_control. This allows us to notice the change in those settings in the standby at the right moment, they used to be included in checkpoint records, but that meant that a changed value was not reflected in the standby until the first checkpoint after the change. Bump PG_CONTROL_VERSION and XLOG_PAGE_MAGIC. Whack XLOG_PAGE_MAGIC back to the sequence it used to follow, before hot standby and subsequent patches changed it to 0x9003.
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@ -11,7 +11,7 @@
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* IDENTIFICATION
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* $PostgreSQL: pgsql/src/backend/storage/ipc/standby.c,v 1.19 2010/04/23 23:21:44 rhaas Exp $
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* $PostgreSQL: pgsql/src/backend/storage/ipc/standby.c,v 1.20 2010/04/28 16:10:42 heikki Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -256,7 +256,7 @@ ResolveRecoveryConflictWithSnapshot(TransactionId latestRemovedXid, RelFileNode
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*/
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if (!TransactionIdIsValid(latestRemovedXid))
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{
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elog(DEBUG1, "Invalid latestremovexXid reported, using latestcompletedxid instead");
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elog(DEBUG1, "invalid latestremovexXid reported, using latestcompletedxid instead");
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LWLockAcquire(ProcArrayLock, LW_SHARED);
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latestRemovedXid = ShmemVariableCache->latestCompletedXid;
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