On Tue, May 24, 2022 at 7:58 AM Masahiko Sawada <sawada.mshk@gmail.com> wrote:
>
> On Mon, May 23, 2022 at 2:39 PM Amit Kapila <amit.kapila16@gmail.com> wrote:
> >
> > On Mon, May 23, 2022 at 10:03 AM Kyotaro Horiguchi
> > <horikyota.ntt@gmail.com> wrote:
> > >
> > > At Sat, 21 May 2022 15:35:58 +0530, Amit Kapila <amit.kapila16@gmail.com> wrote in
> > > > I think if we don't have any better ideas then we should go with
> > > > either this or one of the other proposals in this thread. The other
> > > > idea that occurred to me is whether we can somehow update the snapshot
> > > > we have serialized on disk about this information. On each
> > > > running_xact record when we serialize the snapshot, we also try to
> > > > purge the committed xacts (via SnapBuildPurgeCommittedTxn). So, during
> > > > that we can check if there are committed xacts to be purged and if we
> > > > have previously serialized the snapshot for the prior running xact
> > > > record, if so, we can update it with the list of xacts that have
> > > > catalog changes. If this is feasible then I think we need to somehow
> > > > remember the point where we last serialized the snapshot (maybe by
> > > > using builder->last_serialized_snapshot). Even, if this is feasible we
> > > > may not be able to do this in back-branches because of the disk-format
> > > > change required for this.
> > > >
> > > > Thoughts?
>
> It seems to work, could you draft the patch?
>
I can help with the review and discussion.
--
With Regards,
Amit Kapila.