Make walreceiver send a reply after receiving data but before flushing it.

robertmhaas · robertmhaas · commit 30f6136f28a6 · 2011-03-25T11:28:16.000-04:00
It originally worked this way, but was changed by commit a8a8a3e, since which time it's been impossible for walreceiver to ever send a reply with write_location and flush_location set to different values.
diff --git a/src/backend/replication/walreceiver.c b/src/backend/replication/walreceiver.c
@@ -317,6 +317,9 @@ WalReceiverMain(void)
 			while (walrcv_receive(0, &type, &buf, &len))
 				XLogWalRcvProcessMsg(type, buf, len);
 
+			/* Let the master know that we received some data. */
+			XLogWalRcvSendReply();
+
 			/*
 			 * If we've written some records, flush them to disk and let the
 			 * startup process and primary server know about them.
