Horton

Re: row filtering for logical replication

Amit Kapila <amit.kapila16@gmail.com>

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From: Amit Kapila <amit.kapila16@gmail.com>
To: Peter Smith <smithpb2250@gmail.com>
Cc: "houzj.fnst@fujitsu.com" <houzj.fnst@fujitsu.com>, "tanghy.fnst@fujitsu.com" <tanghy.fnst@fujitsu.com>, Euler Taveira <euler@eulerto.com>, Greg Nancarrow <gregn4422@gmail.com>, vignesh C <vignesh21@gmail.com>, Ajin Cherian <itsajin@gmail.com>, Dilip Kumar <dilipbalaut@gmail.com>, Rahila Syed <rahilasyed90@gmail.com>, Peter Eisentraut <peter.eisentraut@enterprisedb.com>, Önder Kalacı <onderkalaci@gmail.com>, japin <japinli@hotmail.com>, Michael Paquier <michael@paquier.xyz>, David Steele <david@pgmasters.net>, Craig Ringer <craig@2ndquadrant.com>, Amit Langote <amitlangote09@gmail.com>, PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>
Date: 2022-01-05T06:44:54Z
Lists: pgsql-hackers

Commits

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  1. Release cache tuple when no longer needed

  2. Add some additional tests for row filters in logical replication.

  3. Fix one of the tests introduced in commit 52e4f0cd47.

  4. Allow specifying row filters for logical replication of tables.

  5. Move scanint8() to numutils.c

  6. Replace Test::More plans with done_testing

  7. Reduce relcache access in WAL sender streaming logical changes

  8. Small cleanups related to PUBLICATION framework code

  9. Add a view to show the stats of subscription workers.

  10. Allow publishing the tables of schema.

  11. Doc: improve documentation of CREATE/ALTER SUBSCRIPTION.

  12. Add PublicationTable and PublicationRelInfo structs

  13. Remove unused argument "txn" in maybe_send_schema().

  14. Add prepare API support for streaming transactions in logical replication.

  15. Unify PostgresNode's new() and get_new_node() methods

  16. Use l*_node() family of functions where appropriate

  17. Add support for prepared transactions to built-in logical replication.

  18. Restore the portal-level snapshot after procedure COMMIT/ROLLBACK.

  19. Rename a parse node to be more general

  20. Remove unused column atttypmod from initial tablesync query

  21. SEARCH and CYCLE clauses

On Wed, Jan 5, 2022 at 11:04 AM Peter Smith <smithpb2250@gmail.com> wrote:
>
>
> 11. src/backend/utils/cache/relcache.c - GetRelationPublicationActions
>
> Something seemed slightly fishy with the code doing the memcpy,
> because IIUC is possible for the GetRelationPublicationInfo function
> to return without setting the relation->rd_pubactions. Is it just
> missing an Assert or maybe a comment to say such a scenario is not
> possible in this case because the is_publishable_relation was already
> tested?
>

I think it would be good to have an Assert for a valid value of
relation->rd_pubactions before doing memcpy. Alternatively, in
function, GetRelationPublicationInfo(), we can have an Assert when
rd_rfcol_valid is true. I think we can add comments atop
GetRelationPublicationInfo about pubactions.

>
> 13. src/include/utils/rel.h - comment typos
>
> @@ -164,6 +164,13 @@ typedef struct RelationData
>   PublicationActions *rd_pubactions; /* publication actions */
>
>   /*
> + * true if the columns referenced in row filters from all the publications
> + * the relation is in are part of replica identity, or the publication
> + * actions do not include UPDATE and DELETE.
> + */
>
> Some minor rewording of the comment:
>
...
> "UPDATE and DELETE" --> "UPDATE or DELETE"
>

The existing comment seems correct to me. Hou-San can confirm it once
as I think this is written by him.

-- 
With Regards,
Amit Kapila.