Re: Skipping logical replication transactions on subscriber side

From: Greg Nancarrow <gregn4422(at)gmail(dot)com>
To: Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com>
Cc: "osumi(dot)takamichi(at)fujitsu(dot)com" <osumi(dot)takamichi(at)fujitsu(dot)com>, "tanghy(dot)fnst(at)fujitsu(dot)com" <tanghy(dot)fnst(at)fujitsu(dot)com>, Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>, vignesh C <vignesh21(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>, 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: 2022-01-19 07:14:28
Message-ID: CAJcOf-ef_hbOi8HRYEPSejGY1V7M+Sirok=8Lqy5Jt3TtoxeDw@mail.gmail.com
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On Tue, Jan 18, 2022 at 5:05 PM Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com> wrote:
>
> I've attached a rebased patch.

A couple of comments for the v8 patch:

doc/src/sgml/logical-replication.sgml

(1)
Strictly-speaking it's the transaction, not transaction ID, that
contains changes, so suggesting minor change:

BEFORE:
+ The transaction ID that contains the change violating the constraint can be
AFTER:
+ The ID of the transaction that contains the change violating the
constraint can be

doc/src/sgml/ref/alter_subscription.sgml

(2) apply_handle_commit_internal
It's not entirely apparent what commits the clearing of subskixpid
here, so I suggest the following addition:

BEFORE:
+ * clear subskipxid of pg_subscription.
AFTER:
+ * clear subskipxid of pg_subscription, then commit.

Regards,
Greg Nancarrow
Fujitsu Australia

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