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Make pg_promote() detect postmaster death while waiting for promotion to end.
Previously even if postmaster died and WaitLatch() woke up with that event while pg_promote() was waiting for the standby promotion to finish, pg_promote() did nothing special and kept waiting until timeout occurred. This could cause a busy loop. This patch make pg_promote() return false immediately when postmaster dies, to avoid such a busy loop. Back-patch to v12 where pg_promote() was added. Author: Fujii Masao Reviewed-by: Michael Paquier Discussion: https://postgr.es/m/CAHGQGwEs9ROgSp+QF+YdDU+xP8W=CY1k-_Ov-d_Z3JY+to3eXA@mail.gmail.com
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@ -759,6 +759,8 @@ pg_promote(PG_FUNCTION_ARGS)
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#define WAITS_PER_SECOND 10
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for (i = 0; i < WAITS_PER_SECOND * wait_seconds; i++)
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{
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int rc;
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ResetLatch(MyLatch);
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if (!RecoveryInProgress())
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@ -766,10 +768,17 @@ pg_promote(PG_FUNCTION_ARGS)
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CHECK_FOR_INTERRUPTS();
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(void) WaitLatch(MyLatch,
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rc = WaitLatch(MyLatch,
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WL_LATCH_SET | WL_TIMEOUT | WL_POSTMASTER_DEATH,
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1000L / WAITS_PER_SECOND,
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WAIT_EVENT_PROMOTE);
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/*
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* Emergency bailout if postmaster has died. This is to avoid the
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* necessity for manual cleanup of all postmaster children.
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*/
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if (rc & WL_POSTMASTER_DEATH)
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PG_RETURN_BOOL(false);
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}
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ereport(WARNING,
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