Re: pg_rewind vs superuser

Hi,

On Thu, Apr 04, 2019 at 01:11:29PM +0900, Michael Paquier wrote:
> At the same time, let's also document that we need to use a checkpoint
> on the promoted standby so as the control file gets a refresh and
> pg_rewind is able to work properly.  I promised that some time ago and
> got reminded of that issue after seeing this thread...

Is there a good reason why Postgres doesn't just issue a CHECKPOINT
after promote itself? After all, this seems to be about making the
control file having the proper content, which sounds like a good thing
to have in general.

Could this be a problem for anything else besides pg_rewind?

This looks like a needless footgun waiting to happen, and just
documenting it in pg_rewind's notes section looks a bit too hidden to me
(but is certainly an improvement).


Michael