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Introduce wal_level GUC to explicitly control if information needed for

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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.
This commit is contained in:
Heikki Linnakangas
2010-04-28 16:10:43 +00:00
parent a2de4826e9
commit 9b8a73326e
22 changed files with 340 additions and 224 deletions
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12
src/backend/access/heap/rewriteheap.c
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@ -96,7 +96,7 @@
* Portions Copyright (c) 1994-5, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/access/heap/rewriteheap.c,v 1.21 2010/02/26 02:00:33 momjian Exp $
* $PostgreSQL: pgsql/src/backend/access/heap/rewriteheap.c,v 1.22 2010/04/28 16:10:40 heikki Exp $
*
*-------------------------------------------------------------------------
*/
@ -278,16 +278,6 @@ end_heap_rewrite(RewriteState state)
(char *) state->rs_buffer, true);
}
/* Write an XLOG UNLOGGED record if WAL-logging was skipped */
if (!state->rs_use_wal && !state->rs_new_rel->rd_istemp)
{
char reason[NAMEDATALEN + 30];
snprintf(reason, sizeof(reason), "heap rewrite on \"%s\"",
RelationGetRelationName(state->rs_new_rel));
XLogReportUnloggedStatement(reason);
}
/*
* If the rel isn't temp, must fsync before commit. We use heap_sync to
* ensure that the toast table gets fsync'd too.