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Wake up launcher when enabling a subscription

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Otherwise one would have to wait up to DEFAULT_NAPTIME_PER_CYCLE until
the subscription worker is considered for starting.

There is a small race condition:  If one enables a subscription right
after disabling it, the launcher might not have registered the stopping
when receiving the wakeup signal for the re-enabling.  The start will
then not happen right away but after the full cycle time.

Author: Kyotaro HORIGUCHI <horiguchi.kyotaro@lab.ntt.co.jp>
This commit is contained in:
Peter Eisentraut 2017-04-25 14:40:33 -04:00
parent ef0ba572b6
commit a3f17b9c31
1 changed files with 3 additions and 0 deletions
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3
src/backend/commands/subscriptioncmds.c
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@ -644,6 +644,9 @@ AlterSubscription(AlterSubscriptionStmt *stmt)
BoolGetDatum(enabled); BoolGetDatum(enabled);
replaces[Anum_pg_subscription_subenabled - 1] = true; replaces[Anum_pg_subscription_subenabled - 1] = true;
if (enabled)
ApplyLauncherWakeupAtCommit();
update_tuple = true; update_tuple = true;
break; break;
} }