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In replication, when we shutdown the master, walsender tries to send all the outstanding WAL records to the standby, and then to exit. This basically means that all the WAL records are fully synced between two servers after the clean shutdown of the master. So, after promoting the standby to new master, we can restart the stopped master as new standby without the need for a fresh backup from new master. But there was one problem so far: though walsender tries to send all the outstanding WAL records, it doesn't wait for them to be replicated to the standby. Then, before receiving all the WAL records, walreceiver can detect the closure of connection and exit. We cannot guarantee that there is no missing WAL in the standby after clean shutdown of the master. In this case, backup from new master is required when restarting the stopped master as new standby. This patch fixes this problem. It just changes walsender so that it waits for all the outstanding WAL records to be replicated to the standby before closing the replication connection. Per discussion, this is a fix that needs to get backpatched rather than new feature. So, back-patch to 9.1 where enough infrastructure for this exists. Patch by me, reviewed by Andres Freund. |
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