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Fix bug in clean shutdown of walsender that pg_receiving is connecting to.

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On clean shutdown, walsender waits for all WAL to be replicated to a standby,
and exits. It determined whether that replication had been completed by
checking whether its sent location had been equal to a standby's flush
location. Unfortunately this condition never becomes true when the standby
such as pg_receivexlog which always returns an invalid flush location is
connecting to walsender, and then walsender waits forever.

This commit changes walsender so that it just checks a standby's write
location if a flush location is invalid.

Back-patch to 9.1 where enough infrastructure for this exists.
This commit is contained in:
Fujii Masao 2014-03-17 20:37:50 +09:00
parent 02703ff227
commit 5c6d9fc4b2
1 changed files with 11 additions and 1 deletions
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12
src/backend/replication/walsender.c
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@ -2446,10 +2446,20 @@ XLogSendLogical(void)
static void
WalSndDone(WalSndSendDataCallback send_data)
{
XLogRecPtr replicatedPtr;
/* ... let's just be real sure we're caught up ... */
send_data();
if (WalSndCaughtUp && sentPtr == MyWalSnd->flush &&
/*
* Check a write location to see whether all the WAL have
* successfully been replicated if this walsender is connecting
* to a standby such as pg_receivexlog which always returns
* an invalid flush location. Otherwise, check a flush location.
*/
replicatedPtr = XLogRecPtrIsInvalid(MyWalSnd->flush) ?
MyWalSnd->write : MyWalSnd->flush;
if (WalSndCaughtUp && sentPtr == replicatedPtr &&
!pq_is_send_pending())
{
/* Inform the standby that XLOG streaming is done */