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action_at_recovery_target recovery config option

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action_at_recovery_target = pause | promote | shutdown

Petr Jelinek

Reviewed by Muhammad Asif Naeem, Fujji Masao and
Simon Riggs
This commit is contained in:
Simon Riggs
2014-11-25 20:13:30 +00:00
parent bb1b8f694a
commit aedccb1f6f
4 changed files with 159 additions and 19 deletions
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98
src/backend/access/transam/xlog.c
View File

@@ -228,7 +228,7 @@ static char *recoveryEndCommand = NULL;
static char *archiveCleanupCommand = NULL;
static RecoveryTargetType recoveryTarget = RECOVERY_TARGET_UNSET;
static bool recoveryTargetInclusive = true;
static bool recoveryPauseAtTarget = true;
static RecoveryTargetAction actionAtRecoveryTarget = RECOVERY_TARGET_ACTION_PAUSE;
static TransactionId recoveryTargetXid;
static TimestampTz recoveryTargetTime;
static char *recoveryTargetName;
@@ -4647,6 +4647,9 @@ readRecoveryCommandFile(void)
ConfigVariable *item,
*head = NULL,
*tail = NULL;
bool recoveryPauseAtTargetSet = false;
bool actionAtRecoveryTargetSet = false;
fd = AllocateFile(RECOVERY_COMMAND_FILE, "r");
if (fd == NULL)
@@ -4692,13 +4695,43 @@ readRecoveryCommandFile(void)
}
else if (strcmp(item->name, "pause_at_recovery_target") == 0)
{
bool recoveryPauseAtTarget;
if (!parse_bool(item->value, &recoveryPauseAtTarget))
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("parameter \"%s\" requires a Boolean value", "pause_at_recovery_target")));
ereport(DEBUG2,
(errmsg_internal("pause_at_recovery_target = '%s'",
item->value)));
actionAtRecoveryTarget = recoveryPauseAtTarget ?
RECOVERY_TARGET_ACTION_PAUSE :
RECOVERY_TARGET_ACTION_PROMOTE;
recoveryPauseAtTargetSet = true;
}
else if (strcmp(item->name, "action_at_recovery_target") == 0)
{
if (strcmp(item->value, "pause") == 0)
actionAtRecoveryTarget = RECOVERY_TARGET_ACTION_PAUSE;
else if (strcmp(item->value, "promote") == 0)
actionAtRecoveryTarget = RECOVERY_TARGET_ACTION_PROMOTE;
else if (strcmp(item->value, "shutdown") == 0)
actionAtRecoveryTarget = RECOVERY_TARGET_ACTION_SHUTDOWN;
else
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("invalid value for recovery parameter \"%s\"",
"action_at_recovery_target"),
errhint("The allowed values are \"pause\", \"promote\" and \"shutdown\".")));
ereport(DEBUG2,
(errmsg_internal("action_at_recovery_target = '%s'",
item->value)));
actionAtRecoveryTargetSet = true;
}
else if (strcmp(item->name, "recovery_target_timeline") == 0)
{
@@ -4863,6 +4896,28 @@ readRecoveryCommandFile(void)
RECOVERY_COMMAND_FILE)));
}
/*
* Check for mutually exclusive parameters
*/
if (recoveryPauseAtTargetSet && actionAtRecoveryTargetSet)
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("cannot set both \"%s\" and \"%s\" recovery parameters",
"pause_at_recovery_target",
"action_at_recovery_target"),
errhint("The \"pause_at_recovery_target\" is deprecated.")));
/*
* Override any inconsistent requests. Not that this is a change
* of behaviour in 9.5; prior to this we simply ignored a request
* to pause if hot_standby = off, which was surprising behaviour.
*/
if (actionAtRecoveryTarget == RECOVERY_TARGET_ACTION_PAUSE &&
actionAtRecoveryTargetSet &&
standbyState == STANDBY_DISABLED)
actionAtRecoveryTarget = RECOVERY_TARGET_ACTION_SHUTDOWN;
/* Enable fetching from archive recovery area */
ArchiveRecoveryRequested = true;
@@ -6415,10 +6470,37 @@ StartupXLOG(void)
* end of main redo apply loop
*/
if (recoveryPauseAtTarget && reachedStopPoint)
if (reachedStopPoint)
{
SetRecoveryPause(true);
recoveryPausesHere();
if (!reachedConsistency)
ereport(FATAL,
(errmsg("requested recovery stop point is before consistent recovery point")));
/*
* This is the last point where we can restart recovery with a
* new recovery target, if we shutdown and begin again. After
* this, Resource Managers may choose to do permanent corrective
* actions at end of recovery.
*/
switch (actionAtRecoveryTarget)
{
case RECOVERY_TARGET_ACTION_SHUTDOWN:
/*
* exit with special return code to request shutdown
* of postmaster. Log messages issued from
* postmaster.
*/
proc_exit(3);
case RECOVERY_TARGET_ACTION_PAUSE:
SetRecoveryPause(true);
recoveryPausesHere();
/* drop into promote */
case RECOVERY_TARGET_ACTION_PROMOTE:
break;
}
}
/* Allow resource managers to do any required cleanup. */
@@ -6436,6 +6518,7 @@ StartupXLOG(void)
ereport(LOG,
(errmsg("last completed transaction was at log time %s",
timestamptz_to_str(xtime))));
InRedo = false;
}
else
@@ -6496,13 +6579,6 @@ StartupXLOG(void)
(EndOfLog < minRecoveryPoint ||
!XLogRecPtrIsInvalid(ControlFile->backupStartPoint)))
{
if (reachedStopPoint)
{
/* stopped because of stop request */
ereport(FATAL,
(errmsg("requested recovery stop point is before consistent recovery point")));
}
/*
* Ran off end of WAL before reaching end-of-backup WAL record, or
* minRecoveryPoint. That's usually a bad sign, indicating that you