Re: pg_replication_origin_drop API potential race condition

On Thu, Feb 4, 2021 at 4:43 PM Amit Kapila <amit.kapila16@gmail.com> wrote:
>
> On Thu, Feb 4, 2021 at 9:57 AM Peter Smith <smithpb2250@gmail.com> wrote:
> >
> > On Wed, Feb 3, 2021 at 11:17 PM Amit Kapila <amit.kapila16@gmail.com> wrote:
> >
> > >
> > > How about if we call replorigin_by_name() inside replorigin_drop after
> > > acquiring the lock? Wouldn't that close this race condition? We are
> > > doing something similar for pg_replication_origin_advance().
> > >
> >
> > Yes, that seems ok.
> >
> > I wonder if it is better to isolate that locked portion
> > (replyorigin_by_name + replorigin_drop) so that in addition to being
> > called from pg_replication_origin_drop, we can call it internally from
> > PG code to safely drop the origins.
> >
>
> Yeah, I think that would be really good.

PSA a patch which I think implements what we are talking about.

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Kind Regards,
Peter Smith.
Fujitsu Australia