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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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14
src/backend/utils/misc/guc.c
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@ -10,7 +10,7 @@
* Written by Peter Eisentraut <peter_e@gmx.net>.
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/misc/guc.c,v 1.551 2010/04/22 19:40:03 petere Exp $
* $PostgreSQL: pgsql/src/backend/utils/misc/guc.c,v 1.552 2010/04/28 16:10:42 heikki Exp $
*
*--------------------------------------------------------------------
*/
@ -340,6 +340,7 @@ static const struct config_enum_entry constraint_exclusion_options[] = {
/*
* Options for enum values stored in other modules
*/
extern const struct config_enum_entry wal_level_options[];
extern const struct config_enum_entry sync_method_options[];
/*
@ -2784,6 +2785,15 @@ static struct config_enum ConfigureNamesEnum[] =
TRACK_FUNC_OFF, track_function_options, NULL, NULL
},
{
{"wal_level", PGC_POSTMASTER, WAL_SETTINGS,
gettext_noop("Set the level of information written to the WAL."),
NULL
},
&wal_level,
WAL_LEVEL_MINIMAL, wal_level_options, NULL
},
{
{"wal_sync_method", PGC_SIGHUP, WAL_SETTINGS,
gettext_noop("Selects the method used for forcing WAL updates to disk."),
@ -7862,7 +7872,7 @@ pg_timezone_abbrev_initialize(void)
static const char *
show_archive_command(void)
{
if (XLogArchiveMode)
if (XLogArchivingActive())
return XLogArchiveCommand;
else
return "(disabled)";