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Commit0d6c9e0

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Fix autovacuum launcher shutdown sequence
It was previously possible to have the launcher re-execute its main loopbefore shutting down if some other signal was received or an erroroccurred after getting SIGTERM, as reported by Qingqing Zhou.While investigating, Tom Lane further noticed that if autovacuum hadbeen disabled in the config file, it would misbehave by trying to starta new worker instead of bailing out immediately -- it would consideritself as invoked in emergency mode.Fix both problems by checking the shutdown flag in a few more places.These problems have existed since autovacuum was introduced, sobackpatch all the way back.
1 parentb1145ca commit0d6c9e0

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‎src/backend/postmaster/autovacuum.c

Lines changed: 13 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -534,6 +534,10 @@ AutoVacLauncherMain(int argc, char *argv[])
534534
/* Now we can allow interrupts again */
535535
RESUME_INTERRUPTS();
536536

537+
/* if in shutdown mode, no need for anything further; just go away */
538+
if (got_SIGTERM)
539+
gotoshutdown;
540+
537541
/*
538542
* Sleep at least 1 second after any error. We don't want to be
539543
* filling the error logs as fast as we can.
@@ -569,10 +573,14 @@ AutoVacLauncherMain(int argc, char *argv[])
569573
SetConfigOption("default_transaction_isolation","read committed",
570574
PGC_SUSET,PGC_S_OVERRIDE);
571575

572-
/* in emergency mode, just start a worker and go away */
576+
/*
577+
* In emergency mode, just start a worker (unless shutdown was requested)
578+
* and go away.
579+
*/
573580
if (!AutoVacuumingActive())
574581
{
575-
do_start_worker();
582+
if (!got_SIGTERM)
583+
do_start_worker();
576584
proc_exit(0);/* done */
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}
578586

@@ -587,7 +595,8 @@ AutoVacLauncherMain(int argc, char *argv[])
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*/
588596
rebuild_database_list(InvalidOid);
589597

590-
for (;;)
598+
/* loop until shutdown request */
599+
while (!got_SIGTERM)
591600
{
592601
structtimevalnap;
593602
TimestampTzcurrent_time=0;
@@ -787,6 +796,7 @@ AutoVacLauncherMain(int argc, char *argv[])
787796
}
788797

789798
/* Normal exit from the autovac launcher is here */
799+
shutdown:
790800
ereport(LOG,
791801
(errmsg("autovacuum launcher shutting down")));
792802
AutoVacuumShmem->av_launcherpid=0;

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