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Have autovacuum workers listen to SIGHUP, too 

They have historically ignored it, but it's been said to be useful at
times to change their settings mid-flight.

Author: Michael Paquier
This commit is contained in:
Alvaro Herrera 2015-04-03 11:52:55 -03:00
parent 6e4bf4ecd3
commit a75fb9b335
1 changed files with 20 additions and 7 deletions
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27
src/backend/postmaster/autovacuum.c
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@ -311,7 +311,7 @@ static PgStat_StatTabEntry *get_pgstat_tabentry_relid(Oid relid, bool isshared,
PgStat_StatDBEntry *shared,
PgStat_StatDBEntry *dbentry);
static void autovac_report_activity(autovac_table *tab);
static void avl_sighup_handler(SIGNAL_ARGS);
static void av_sighup_handler(SIGNAL_ARGS);
static void avl_sigusr2_handler(SIGNAL_ARGS);
static void avl_sigterm_handler(SIGNAL_ARGS);
static void autovac_refresh_stats(void);
@ -419,7 +419,7 @@ AutoVacLauncherMain(int argc, char *argv[])
* backend, so we use the same signal handling. See equivalent code in
* tcop/postgres.c.
*/
pqsignal(SIGHUP, avl_sighup_handler);
pqsignal(SIGHUP, av_sighup_handler);
pqsignal(SIGINT, StatementCancelHandler);
pqsignal(SIGTERM, avl_sigterm_handler);
@ -1329,7 +1329,7 @@ AutoVacWorkerFailed(void)
/* SIGHUP: set flag to re-read config file at next convenient time */
static void
avl_sighup_handler(SIGNAL_ARGS)
av_sighup_handler(SIGNAL_ARGS)
{
int save_errno = errno;
@ -1460,11 +1460,8 @@ AutoVacWorkerMain(int argc, char *argv[])
* Set up signal handlers. We operate on databases much like a regular
* backend, so we use the same signal handling. See equivalent code in
* tcop/postgres.c.
*
* Currently, we don't pay attention to postgresql.conf changes that
* happen during a single daemon iteration, so we can ignore SIGHUP.
*/
pqsignal(SIGHUP, SIG_IGN);
pqsignal(SIGHUP, av_sighup_handler);
/*
* SIGINT is used to signal canceling the current table's vacuum; SIGTERM
@ -2163,6 +2160,22 @@ do_autovacuum(void)
CHECK_FOR_INTERRUPTS();
/*
* Check for config changes before processing each collected table.
*/
if (got_SIGHUP)
{
got_SIGHUP = false;
ProcessConfigFile(PGC_SIGHUP);
/*
* You might be tempted to bail out if we see autovacuum is now
* disabled. Must resist that temptation -- this might be a
* for-wraparound emergency worker, in which case that would be
* entirely inappropriate.
*/
}
/*
* hold schedule lock from here until we're sure that this table still
* needs vacuuming. We also need the AutovacuumLock to walk the