database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-07-15 19:21:59 +03:00
Code Activity

Introduce wal_level GUC to explicitly control if information needed for

Browse Source 
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
Download Patch File Download Diff File Expand all files Collapse all files

8
src/backend/postmaster/postmaster.c
View File

@ -37,7 +37,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/postmaster/postmaster.c,v 1.605 2010/04/08 01:39:37 rhaas Exp $
* $PostgreSQL: pgsql/src/backend/postmaster/postmaster.c,v 1.606 2010/04/28 16:10:42 heikki Exp $
*
* NOTES
*
@ -728,6 +728,12 @@ PostmasterMain(int argc, char *argv[])
write_stderr("%s: superuser_reserved_connections must be less than max_connections\n", progname);
ExitPostmaster(1);
}
if (XLogArchiveMode && wal_level == WAL_LEVEL_MINIMAL)
ereport(ERROR,
(errmsg("WAL archival (archive_mode='on') requires wal_level 'archive' or 'hot_standby'")));
if (max_wal_senders > 0 && wal_level == WAL_LEVEL_MINIMAL)
ereport(ERROR,
(errmsg("WAL streaming (max_wal_senders > 0) requires wal_level 'archive' or 'hot_standby")));
/*
* Other one-time internal sanity checks can go here, if they are fast.