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Merge wal_level "archive" and "hot_standby" into new name "replica"

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The distinction between "archive" and "hot_standby" existed only because
at the time "hot_standby" was added, there was some uncertainty about
stability.  This is now a long time ago.  We would like to move forward
with simplifying the replication configuration, but this distinction is
in the way, because a primary server cannot tell (without asking a
standby or predicting the future) which one of these would be the
appropriate level.

Pick a new name for the combined setting to make it clearer that it
covers all (non-logical) backup and replication uses.  The old values
are still accepted but are converted internally.

Reviewed-by: Michael Paquier <michael.paquier@gmail.com>
Reviewed-by: David Steele <david@pgmasters.net>
This commit is contained in:
Peter Eisentraut
2016-02-29 20:01:54 -05:00
parent 4e1d2a1708
commit b555ed8102
17 changed files with 44 additions and 54 deletions
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20
src/backend/access/transam/xlog.c
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@ -5866,7 +5866,7 @@ static void
CheckRequiredParameterValues(void)
{
/*
* For archive recovery, the WAL must be generated with at least 'archive'
* For archive recovery, the WAL must be generated with at least 'replica'
* wal_level.
*/
if (ArchiveRecoveryRequested && ControlFile->wal_level == WAL_LEVEL_MINIMAL)
@ -5877,15 +5877,15 @@ CheckRequiredParameterValues(void)
}
/*
* For Hot Standby, the WAL must be generated with 'hot_standby' mode, and
* For Hot Standby, the WAL must be generated with 'replica' mode, and
* we must have at least as many backend slots as the primary.
*/
if (ArchiveRecoveryRequested && EnableHotStandby)
{
if (ControlFile->wal_level < WAL_LEVEL_HOT_STANDBY)
if (ControlFile->wal_level < WAL_LEVEL_REPLICA)
ereport(ERROR,
(errmsg("hot standby is not possible because wal_level was not set to \"hot_standby\" or higher on the master server"),
errhint("Either set wal_level to \"hot_standby\" on the master, or turn off hot_standby here.")));
(errmsg("hot standby is not possible because wal_level was not set to \"replica\" or higher on the master server"),
errhint("Either set wal_level to \"replica\" on the master, or turn off hot_standby here.")));
/* We ignore autovacuum_max_workers when we make this test. */
RecoveryRequiresIntParameter("max_connections",
@ -9459,10 +9459,8 @@ xlog_redo(XLogReaderState *record)
/*
* Update minRecoveryPoint to ensure that if recovery is aborted, we
* recover back up to this point before allowing hot standby again.
* This is particularly important if wal_level was set to 'archive'
* before, and is now 'hot_standby', to ensure you don't run queries
* against the WAL preceding the wal_level change. Same applies to
* decreasing max_* settings.
* This is important if the max_* settings are decreased, to ensure
* you don't run queries against the WAL preceding the change.
*/
minRecoveryPoint = ControlFile->minRecoveryPoint;
minRecoveryPointTLI = ControlFile->minRecoveryPointTLI;
@ -9793,7 +9791,7 @@ do_pg_start_backup(const char *backupidstr, bool fast, TimeLineID *starttli_p,
ereport(ERROR,
(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
errmsg("WAL level not sufficient for making an online backup"),
errhint("wal_level must be set to \"archive\", \"hot_standby\", or \"logical\" at server start.")));
errhint("wal_level must be set to \"replica\" or \"logical\" at server start.")));
if (strlen(backupidstr) > MAXPGPATH)
ereport(ERROR,
@ -10264,7 +10262,7 @@ do_pg_stop_backup(char *labelfile, bool waitforarchive, TimeLineID *stoptli_p)
ereport(ERROR,
(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
errmsg("WAL level not sufficient for making an online backup"),
errhint("wal_level must be set to \"archive\", \"hot_standby\", or \"logical\" at server start.")));
errhint("wal_level must be set to \"replica\" or \"logical\" at server start.")));
/*
* OK to update backup counters and forcePageWrites