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: "houzj.fnst@fujitsu.com" <houzj.fnst@fujitsu.com>
Cc: vignesh C <vignesh21@gmail.com>, Peter Smith <smithpb2250@gmail.com>, Greg Nancarrow <gregn4422@gmail.com>, "tanghy.fnst@fujitsu.com" <tanghy.fnst@fujitsu.com>, Ajin Cherian <itsajin@gmail.com>, Dilip Kumar <dilipbalaut@gmail.com>, Euler Taveira <euler@eulerto.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: 2021-11-23T10:15:51Z
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 Tue, Nov 23, 2021 at 1:29 PM houzj.fnst@fujitsu.com
<houzj.fnst@fujitsu.com> wrote:
>
> On Tues, Nov 23, 2021 2:27 PM vignesh C <vignesh21@gmail.com> wrote:
> > On Thu, Nov 18, 2021 at 7:04 AM Peter Smith <smithpb2250@gmail.com>
> > wrote:
> > >
> > > PSA new set of v40* patches.
> >
> > Few comments:
> > 1) When a table is added to the publication, replica identity is checked. But
> > while modifying the publish action to include delete/update, replica identity is
> > not checked for the existing tables. I felt it should be checked for the existing
> > tables too.
>
> In addition to this, I think we might also need some check to prevent user from
> changing the REPLICA IDENTITY index which is used in the filter expression.
>
> I was thinking is it possible do the check related to REPLICA IDENTITY in
> function CheckCmdReplicaIdentity() or In GetRelationPublicationActions(). If we
> move the REPLICA IDENTITY check to this function, it would be consistent with
> the existing behavior about the check related to REPLICA IDENTITY(see the
> comments in CheckCmdReplicaIdentity) and seems can cover all the cases
> mentioned above.
>

Yeah, adding the replica identity check in CheckCmdReplicaIdentity()
would cover all the above cases but I think that would put a premium
on each update/delete operation. I think traversing the expression
tree (it could be multiple traversals if the relation is part of
multiple publications) during each update/delete would be costly.
Don't you think so?

-- 
With Regards,
Amit Kapila.