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If the stats collector dies during Hot Standby, restart it.

Browse Source 
This bug exists as far back as 9.0, when Hot Standby was introduced,
so back-patch to all supported branches.

Report and patch by Takayuki Tsunakawa, reviewed by Michael Paquier
and Kuntal Ghosh.
This commit is contained in:
Robert Haas
2016-10-27 14:27:40 -04:00
parent 629575fa2d
commit 2be2838a71
1 changed files with 3 additions and 2 deletions
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5
src/backend/postmaster/postmaster.c
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@ -1517,7 +1517,8 @@ ServerLoop(void)
PgArchPID = pgarch_start();
/* If we have lost the stats collector, try to start a new one */
if (PgStatPID == 0 && pmState == PM_RUN)
if (PgStatPID == 0 &&
(pmState == PM_RUN || pmState == PM_HOT_STANDBY))
PgStatPID = pgstat_start();
/* If we need to signal the autovacuum launcher, do so now */
@ -2690,7 +2691,7 @@ reaper(SIGNAL_ARGS)
if (!EXIT_STATUS_0(exitstatus))
LogChildExit(LOG, _("statistics collector process"),
pid, exitstatus);
if (pmState == PM_RUN)
if (pmState == PM_RUN || pmState == PM_HOT_STANDBY)
PgStatPID = pgstat_start();
continue;
}