Re: Skipping logical replication transactions on subscriber side

From: Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>
To: Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com>
Cc: "tanghy(dot)fnst(at)fujitsu(dot)com" <tanghy(dot)fnst(at)fujitsu(dot)com>, vignesh C <vignesh21(at)gmail(dot)com>, Greg Nancarrow <gregn4422(at)gmail(dot)com>, Peter Eisentraut <peter(dot)eisentraut(at)enterprisedb(dot)com>, "houzj(dot)fnst(at)fujitsu(dot)com" <houzj(dot)fnst(at)fujitsu(dot)com>, "osumi(dot)takamichi(at)fujitsu(dot)com" <osumi(dot)takamichi(at)fujitsu(dot)com>, Alexey Lesovsky <lesovsky(at)gmail(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Skipping logical replication transactions on subscriber side
Date: 2022-01-21 04:20:41
Message-ID: CAA4eK1Ltg=3bRWDf-FH4A-dwFv0LGoXV0LxoPSf88oKFO-fGDw@mail.gmail.com
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On Tue, Jan 18, 2022 at 9:21 AM Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com> wrote:
>
> On Tue, Jan 18, 2022 at 12:37 PM Amit Kapila <amit(dot)kapila16(at)gmail(dot)com> wrote:
> >
> > On Tue, Jan 18, 2022 at 8:34 AM tanghy(dot)fnst(at)fujitsu(dot)com
> > <tanghy(dot)fnst(at)fujitsu(dot)com> wrote:
> > >
> > > On Mon, Jan 17, 2022 2:18 PM Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com> wrote:
> > > >
> > >
> > > 2) The following two places are not consistent in whether "= value" is surround
> > > with square brackets.
> > >
> > > +ALTER SUBSCRIPTION <replaceable class="parameter">name</replaceable> SKIP ( <replaceable class="parameter">skip_option</replaceable> [= <replaceable class="parameter">value</replaceable>] [, ... ] )
> > >
> > > + <term><literal>SKIP ( <replaceable class="parameter">skip_option</replaceable> = <replaceable class="parameter">value</replaceable> [, ... ] )</literal></term>
> > >
> > > Should we modify the first place to:
> > > +ALTER SUBSCRIPTION <replaceable class="parameter">name</replaceable> SKIP ( <replaceable class="parameter">skip_option</replaceable> = <replaceable class="parameter">value</replaceable> [, ... ] )
> > >
> > > Because currently there is only one skip_option - xid, and a parameter must be
> > > specified when using it.
> > >
> >
> > Good observation. Do we really need [, ... ] as currently, we support
> > only one value for XID?
>
> I think no. In the doc, it should be:
>
> ALTER SUBSCRIPTION name SKIP ( skip_option = value )
>

In the latest patch, I see:
+ <varlistentry>
+ <term><literal>SKIP ( <replaceable
class="parameter">skip_option</replaceable> = <replaceable
class="parameter">value</replaceable> [, ... ] )</literal></term>

What do we want to indicate by [, ... ]? To me, it appears like
multiple options but that is not what we support currently.

--
With Regards,
Amit Kapila.

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