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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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27
src/backend/commands/tablecmds.c
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@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/commands/tablecmds.c,v 1.329 2010/03/20 00:43:42 rhaas Exp $
* $PostgreSQL: pgsql/src/backend/commands/tablecmds.c,v 1.330 2010/04/28 16:10:41 heikki Exp $
*
*-------------------------------------------------------------------------
*/
@@ -3272,14 +3272,7 @@ ATRewriteTable(AlteredTableInfo *tab, Oid OIDNewHeap)
/* If we skipped writing WAL, then we need to sync the heap. */
if (hi_options & HEAP_INSERT_SKIP_WAL)
{
char reason[NAMEDATALEN + 30];
snprintf(reason, sizeof(reason), "table rewrite on \"%s\"",
RelationGetRelationName(newrel));
XLogReportUnloggedStatement(reason);
heap_sync(newrel);
}
heap_close(newrel, NoLock);
}
@@ -7021,20 +7014,6 @@ ATExecSetTableSpace(Oid tableOid, Oid newTableSpace)
heap_close(pg_class, RowExclusiveLock);
/*
* Write an XLOG UNLOGGED record if WAL-logging was skipped because WAL
* archiving is not enabled.
*/
if (!XLogIsNeeded() && !rel->rd_istemp)
{
char reason[NAMEDATALEN + 40];
snprintf(reason, sizeof(reason), "ALTER TABLE SET TABLESPACE on \"%s\"",
RelationGetRelationName(rel));
XLogReportUnloggedStatement(reason);
}
relation_close(rel, NoLock);
/* Make sure the reltablespace change is visible */
@@ -7063,10 +7042,6 @@ copy_relation_data(SMgrRelation src, SMgrRelation dst,
/*
* We need to log the copied data in WAL iff WAL archiving/streaming is
* enabled AND it's not a temp rel.
*
* Note: If you change the conditions here, update the conditions in
* ATExecSetTableSpace() for when an XLOG UNLOGGED record is written to
* match.
*/
use_wal = XLogIsNeeded() && !istemp;