Re: [HACKERS] logical decoding of two-phase transactions

On Wed, Mar 24, 2021 at 11:31 PM Amit Kapila <amit(dot)kapila16(at)gmail(dot)com> wrote:
>
> On Tue, Mar 23, 2021 at 3:31 PM Peter Smith <smithpb2250(at)gmail(dot)com> wrote:
> >
> > On Tue, Mar 23, 2021 at 10:44 AM Peter Smith <smithpb2250(at)gmail(dot)com> wrote:
> > >
> > > PSA patches to fix those.
> > >
> >
> > Hi Amit.
> >
> > PSA a patch to allow the ALTER SUBSCRIPTION ... REFRESH PUBLICATION to
> > work when two-phase tristate is PENDING.
> >
> > This is necessary for the pg_dump/pg_restore scenario, or for any
> > other use-case where the subscription might
> > start off having no tables.
> >
>
> + subrels = GetSubscriptionRelations(MySubscription->oid);
> +
> + /*
> + * If there are no tables then leave the state as PENDING, which
> + * allows ALTER SUBSCRIPTION ... REFRESH PUBLICATION to work.
> + */
> + become_two_phase_enabled = list_length(subrels) > 0;
>
> This code is similar at both the places it is used. Isn't it better to
> move this inside AllTablesyncsReady and if required then we can change
> the name of the function.

I agree. That way is better.

PSA a patch which changes the AllTableSyncsReady function to now
include the zero tables check.

(This patch is to be applied on top of all previous patches)

------
Kind Regards,
Peter Smith.
Fujitsu Australia.