Re: Skipping logical replication transactions on subscriber side

On Wed, Nov 24, 2021 at 12:13 PM Amit Kapila <amit(dot)kapila16(at)gmail(dot)com> wrote:
>
> On Wed, Nov 24, 2021 at 7:51 AM Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com> wrote:
> >
> > On Thu, Nov 18, 2021 at 12:52 PM houzj(dot)fnst(at)fujitsu(dot)com
> > <houzj(dot)fnst(at)fujitsu(dot)com> wrote:
> > >
> > > On Tuesday, November 16, 2021 2:31 PM Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com> wrote:
> > > > Right. I've fixed this issue and attached an updated patch.
> > > >
> > > Hi,
> > >
> > > I have few comments for the testcases.
> > >
> > > 1)
> > >
> > > +my $appname = 'tap_sub';
> > > +$node_subscriber->safe_psql(
> > > + 'postgres',
> > > + "CREATE SUBSCRIPTION tap_sub CONNECTION '$publisher_connstr application_name=$appname' PUBLICATION tap_pub WITH (streaming = off, two_phase = on);");
> > > +my $appname_streaming = 'tap_sub_streaming';
> > > +$node_subscriber->safe_psql(
> > > + 'postgres',
> > > + "CREATE SUBSCRIPTION tap_sub_streaming CONNECTION '$publisher_connstr application_name=$appname_streaming' PUBLICATION tap_pub_streaming WITH (streaming = on, two_phase = on);");
> > > +
> > >
> > > I think we can remove the 'application_name=$appname', so that the command
> > > could be shorter.
> >
> > But we wait for the subscription to catch up by using
> > wait_for_catchup() with application_name, no?
> >
>
> Yeah, but you can directly use the subscription name in
> wait_for_catchup because we internally use that as
> fallback_application_name. If application_name is not specified in the
> connection string as suggested by Hou-San then
> fallback_application_name will be considered. Both ways are okay and I
> see we use both ways in the tests but it seems there are more places
> where we use the method Hou-San is suggesting in subscription tests.

Okay, thanks! I referred to tests that set application_name. ISTM it's
better to unite them so as not to confuse them in future tests.

Anyway, I'll remove it in the next version patch that I'll submit soon.

Regards,

--
Masahiko Sawada
EDB: https://www.enterprisedb.com/