Re: Logical replication from PG v13 and below to PG v14 (devel version) is not working.

On Thu, Sep 24, 2020 at 4:31 PM Dilip Kumar <dilipbalaut(at)gmail(dot)com> wrote:
>
> On Thu, Sep 24, 2020 at 11:55 AM Amit Kapila <amit(dot)kapila16(at)gmail(dot)com> wrote:
> >
> > On Tue, Sep 22, 2020 at 5:15 PM Dilip Kumar <dilipbalaut(at)gmail(dot)com> wrote:
> > >
> > > On Tue, Sep 22, 2020 at 12:02 PM Amit Kapila <amit(dot)kapila16(at)gmail(dot)com> wrote:
> > > >
> > > >
> > > > I am not sure if this suggestion makes it better than what is purposed
> > > > by Dilip but I think we can declare them in define number order like
> > > > below:
> > > > #define LOGICALREP_PROTO_MIN_VERSION_NUM 1
> > > > #define LOGICALREP_PROTO_VERSION_NUM 1
> > > > #define LOGICALREP_PROTO_STREAM_VERSION_NUM 2
> > > > #define LOGICALREP_PROTO_MAX_VERSION_NUM LOGICALREP_PROTO_STREAM_VERSION_NUM
> > >
> > > Done this way.
> > >
> >
> > - options.proto.logical.proto_version = LOGICALREP_PROTO_VERSION_NUM;
> > + options.proto.logical.proto_version = MySubscription->stream ?
> > + LOGICALREP_PROTO_STREAM_VERSION_NUM : LOGICALREP_PROTO_VERSION_NUM;
> >
> > Here, I think instead of using MySubscription->stream, we should use
> > server/walrecv version number as we used at one place in tablesync.c.
>
> I am not sure how can we do this?
>

Have you checked what will function walrcv_server_version() will
return? I was thinking that if we know that subscriber is connected to
Publisher version < 14 then we can send the right value.

--
With Regards,
Amit Kapila.