Re: pgsql: Remove secondary checkpoint

On 2017-11-07 14:12:19 -0500, Tom Lane wrote:
> Andres Freund <andres(at)anarazel(dot)de> writes:
> > On 2017-11-07 17:57:31 +0000, Simon Riggs wrote:
> >> Remove secondary checkpoint
>
> > FWIW, I don't think this should be applied without a pg_resetxlog
> > feature allowing to manually use older checkpoints.
>
> Uh, what? We have never before insisted on pg_resetxlog being able
> to use WAL across a WAL format change, and there have been many of
> those.

I think you misunderstand my point - I'm saying that pg_resetxlog should
be able to force the use of older checkpoints, basically as a fallback
to cases where the previous approach might actually have worked, not
that it needs to work across format changes.

Greetings,

Andres Freund