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help / color / mirror / Atom feedFrom: Peter Smith <[email protected]>
To: Dilip Kumar <[email protected]>
Cc: shveta malik <[email protected]>
Cc: Amit Kapila <[email protected]>
Cc: vignesh C <[email protected]>
Cc: Nisha Moond <[email protected]>
Cc: Masahiko Sawada <[email protected]>
Cc: Bharath Rupireddy <[email protected]>
Cc: PostgreSQL Hackers <[email protected]>
Subject: Re: Proposal: Conflict log history table for Logical Replication
Date: Fri, 3 Jul 2026 17:33:26 +1200
Message-ID: <CAHut+PvBQACaj-s8TuR8jF89jpXoQ_eb3DL9S-Rgco5eZJpniA@mail.gmail.com> (raw)
In-Reply-To: <CAFiTN-tV0CSFpkUvDOrCdFob6uVFGj+qxDwY-kw8JKfXqm8mzg@mail.gmail.com>
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Some review comments for v62-0001.
I was midway through reviewing patch v62-0001 when I saw it had
already been pushed [1].
I am posting my review comments here anyway.
======
doc/src/sgml/ddl.sgml
1.
+ <para>
+ The <literal>pg_conflict</literal> schema (sometimes referred to as the
+ <emphasis>conflict schema</emphasis>) contains system-managed conflict
+ log tables used for logical replication conflict tracking.
+ These tables are created and maintained by the system and are not
intended for
+ direct user manipulation. Unlike <literal>pg_catalog</literal>, the
+ <literal>pg_conflict</literal> schema is not implicitly included in the
+ search path, so objects within it must be referenced explicitly or by
+ adjusting the search path.
+ </para>
1a.
Why say "sometimes"?
~
1b.
I thought the markup should be <firstterm> instead of <emphasis>.
~
1c.
We just said this is referred to as the "conflict schema" so let's do that!
/the <literal>pg_conflict</literal> schema is not/the conflict schema is not/
======
doc/src/sgml/ref/create_subscription.sgml
2.
+ <para>
+ The system automatically creates a structured table named
+ <literal>pg_conflict_log_<subid></literal> in the
+ <literal>pg_conflict</literal> schema. This allows for easy
+ querying and analysis of conflicts.
+ </para>
Don't say "pg_conflict schema". Instead, use the term "conflict
schema" with the appropriate <link>.
======
doc/src/sgml/ref/drop_subscription.sgml
3.
+ <para>
+ If a conflict log table exists for the subscription (that is, when
+ <link linkend="sql-createsubscription-params-with-conflict-log-destination">
+ <literal>conflict_log_destination</literal></link> is set to
<literal>table</literal>
+ or <literal>all</literal>), <command>DROP SUBSCRIPTION</command>
automatically drops
+ the associated conflict log table.
+ </para>
This seems a bit awkwardly worded:
SUGGESTION
When <link linkend="sql-createsubscription-params-with-conflict-log-destination"><literal>conflict_log_destination</literal></link>
is set to <literal>table</literal> or <literal>all</literal>,
<command>DROP SUBSCRIPTION</command> automatically drops the
associated conflict log table.
======
GENERAL
4.
policy.c:
+ /*
+ * Conflict log tables are used internally for logical replication
+ * conflict logging and should not be modified directly, as it could
+ * disrupt conflict logging.
+ */
tablecmds.c:
+ /*
+ * Conflict log tables are used internally for logical replication
+ * conflict logging and should not be modified directly, as it could
+ * disrupt conflict logging.
+ */
+ /*
+ * Conflict log tables are used internally for logical replication
+ * conflict logging and should not be altered directly, as it could
+ * disrupt conflict logging. Direct ALTER commands are already rejected
+ /*
+ * Conflict log tables are used internally for logical replication
+ * conflict logging and should not be referenced by foreign keys, as it
+ * could disrupt conflict logging.
+ */
+ /*
+ * Conflict log tables are used internally for logical replication
+ * conflict logging and should not be modified directly, as it could
+ * disrupt conflict logging.
+ */
+ /*
+ * Conflict log tables are used internally for logical replication
+ * conflict logging and should not be altered directly, as it could
+ * disrupt conflict logging.
+ */
trigger.c:
+ /*
+ * Conflict log tables are used internally for logical replication
+ * conflict logging and should not have triggers, as it could disrupt
+ * conflict logging.
+ */
+ /*
+ * Conflict log tables are used internally for logical replication
+ * conflict logging and should not have triggers, as it could disrupt
+ * conflict logging.
+ */
rewriteDefine.c:
+ /*
+ * Conflict log tables are used internally for logical replication
+ * conflict logging and should not have rules, as it could disrupt
+ * conflict logging.
+ */
+ /*
+ * Conflict log tables are used internally for logical replication
+ * conflict logging and should not have rules, as it could disrupt
+ * conflict logging.
+ */
~~~
The wording of the comments above is extremely repetitive. That may
not be noteworthy if the comment was just in one place, but it's
everywhere.
How about like:
BEFORE
Conflict log tables are used internally for logical replication
conflict logging and should not have <xxx>, as it could disrupt
conflict logging.
SUGGESTION
Conflict log tables are internal to logical replication and must not
have <xxx>, since it could interfere with their operation.
======
src/include/catalog/pg_subscription.h
5.
+ /*
+ * Strategy for logging replication conflicts: 'log' - server log only,
+ * 'table' - conflict log table only, 'all' - both log and table.
+ */
+ text subconflictlogdest BKI_FORCE_NOT_NULL;
IIUC, this comment was deliberately aligned for readability for ~50
versions. But then pg_indent wrapped everything. Consider putting it
back how it was and using "/**" style comment so that pg_indent will
leave it alone.
======
[1] https://github.com/postgres/postgres/commit/a5918fddf10d297c70f7ec9067e9177e0be6d520
Kind Regards,
Peter Smith.
Fujitsu Australia
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Subject: Re: Proposal: Conflict log history table for Logical Replication
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