On Sat, Aug 04, 2018 at 07:44:59AM +0100, Simon Riggs wrote: > I think the problem is that writing the online checkpoint is deferred > after promotion, so this is a timing issue that probably doesn't show > in our regression tests.
Somewhat. It is a performance improvement of 9.3 to let the startup request a checkpoint to the checkpointer process instead of doing it itself. > Sounds like we should write a pending timeline change to the control > file and have pg_rewind check that instead. > > I'd call this a timing bug, not a doc issue. Well, having pg_rewind enforce a checkpoint on the promoted standby could cause a performance hit as well if we do it mandatorily as if there is delay between the promotion and the rewind triggerring a checkpoint could have already happen. So it is for me a documentation bug first regarding the failover workflow, and potentially a patch for a new feature which makes pg_rewind trigger directly a checkpoint. -- Michael
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