Before exiting walreceiver, fsync() all the WAL received.

hlinnaka · hlinnaka · commit 34ef02b4d4c0 · 2011-01-17T12:27:35.000+02:00
Otherwise WAL recovery will replay the un-flushed WAL after walreceiver has
exited, which can lead to a non-recoverable standby if the system crashes hard
at that point.
diff --git a/src/backend/replication/walreceiver.c b/src/backend/replication/walreceiver.c
@@ -324,6 +324,9 @@ WalRcvDie(int code, Datum arg)
 	/* use volatile pointer to prevent code rearrangement */
 	volatile WalRcvData *walrcv = WalRcv;
 
+	/* Ensure that all WAL records received are flushed to disk */
+	XLogWalRcvFlush();
+
 	SpinLockAcquire(&walrcv->mutex);
 	Assert(walrcv->walRcvState == WALRCV_RUNNING ||
 		   walrcv->walRcvState == WALRCV_STOPPING);
