Re: backup manifests

On Mon, Mar 30, 2020 at 2:59 PM Andres Freund <andres@anarazel.de> wrote:
> I wonder if it'd not be best, independent of whether we build in this
> verification, to include that metadata in the manifest file. That's for
> sure better than having to build a separate tool to parse timeline
> history files.

I don't think that's better, or at least not "for sure better". The
backup_label going to include the START TIMELINE, and if -Xfetch is
used, we're also going to have all the timeline history files. If the
backup manifest includes those same pieces of information, then we've
got two sources of truth: one copy in the files the server's actually
going to read, and another copy in the backup_manifest which we're
going to potentially use for validation but ignore at runtime. That
seems not great.

> Btw, just in case somebody suggests it: I don't think it's possible to
> compute the WAL checksums at this point. In stream mode WAL very well
> might already have been removed.

Right.

-- 
Robert Haas
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