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Commit580b941

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Prevent non-streaming replication connections from being selected sync slave
This prevents a pg_basebackup backup session that just does a basebackup (no xlog involved at all) from becoming the synchronous slaveand thus blocking all access while it runs.Also fixes the problem when a higher priority slave shows up it wouldbecome the sync standby before it has reached the STREAMING state, bymaking sure we can only switch to a walsender that's actually STREAMING.Fujii Masao
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‎src/backend/replication/syncrep.c

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@@ -399,6 +399,7 @@ SyncRepReleaseWaiters(void)
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volatileWalSnd*walsnd=&walsndctl->walsnds[i];
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if (walsnd->pid!=0&&
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walsnd->state==WALSNDSTATE_STREAMING&&
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walsnd->sync_standby_priority>0&&
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(priority==0||
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priority>walsnd->sync_standby_priority))

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