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Commit7899aa3

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Fix bug in clean shutdown of walsender that pg_receiving is connecting to.
On clean shutdown, walsender waits for all WAL to be replicated to a standby,and exits. It determined whether that replication had been completed bychecking whether its sent location had been equal to a standby's flushlocation. Unfortunately this condition never becomes true when the standbysuch as pg_receivexlog which always returns an invalid flush location isconnecting to walsender, and then walsender waits forever.This commit changes walsender so that it just checks a standby's writelocation if a flush location is invalid.Back-patch to 9.1 where enough infrastructure for this exists.
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‎src/backend/replication/walsender.c

Lines changed: 12 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -808,9 +808,20 @@ WalSndLoop(void)
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*/
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if (walsender_ready_to_stop)
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{
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XLogRecPtrreplicatedPtr;
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/* ... let's just be real sure we're caught up ... */
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XLogSend(output_message,&caughtup);
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if (caughtup&&XLByteEQ(sentPtr,MyWalSnd->flush)&&
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/*
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* Check a write location to see whether all the WAL have
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* successfully been replicated if this walsender is connecting
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* to a standby such as pg_receivexlog which always returns
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* an invalid flush location. Otherwise, check a flush location.
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*/
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replicatedPtr=XLogRecPtrIsInvalid(MyWalSnd->flush) ?
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MyWalSnd->write :MyWalSnd->flush;
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if (caughtup&&XLByteEQ(sentPtr,replicatedPtr)&&
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!pq_is_send_pending())
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{
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walsender_shutdown_requested= true;

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