On 2016-01-11 20:03:18 +0100, Andres Freund wrote: > More generally, I'm doubtful that the approach of reading data from WAL > as proposed here is a very good idea. It seems better to "just" dump the > entire 2pc state into *one* file at checkpoint time.
Or better: After determining the checkpoint redo location, insert a WAL record representing the entire 2PC state as of that moment. That way it can easily restored during WAL replay and nothing special has to be done on a standby. This way we'll need no extra wal flushes and fsyncs.
Feel free to submit a patch that does that.
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Simon Riggs http://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
