On Fri, Oct 27, 2023 at 5:45 AM Michael Paquier <michael@paquier.xyz> wrote:
>
> On Thu, Oct 26, 2023 at 09:40:09AM -0400, Robert Haas wrote:
> > Because of this, it is possible for bucketbuf, prevbuf, and wbuf to be
> > the same (your first scenario) but the second scenario you mention
> > (nextbuf == wbuf) should be impossible.
>
> Okay..
>
> > It seems to me that maybe we shouldn't even be registering wbuf or
> > doing anything at all to it if there are no tuples that need moving.
> > That would also require some adjustment of the redo routine.
>
> Hmm. So my question is: do we need the cleanup lock on the write
> buffer even if there are no tuples, and even if primary bucket and the
> write bucket are the same?
>
Yes, we need it to exclude any concurrent in-progress scans that could
return incorrect tuples during bucket squeeze operation.
--
With Regards,
Amit Kapila.
