Horton
Menu

Re: Perform streaming logical transactions by background workers and parallel apply

Dilip Kumar <dilipbalaut@gmail.com>

View thread
From: Dilip Kumar <dilipbalaut@gmail.com>
To: Amit Kapila <amit.kapila16@gmail.com>
Cc: Masahiko Sawada <sawada.mshk@gmail.com>, "houzj.fnst@fujitsu.com" <houzj.fnst@fujitsu.com>, "wangw.fnst@fujitsu.com" <wangw.fnst@fujitsu.com>, Peter Smith <smithpb2250@gmail.com>, "shiy.fnst@fujitsu.com" <shiy.fnst@fujitsu.com>, PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>
Date: 2022-10-20T03:18:46Z
Lists: pgsql-hackers 
On Tue, Oct 18, 2022 at 6:25 PM Amit Kapila <amit.kapila16@gmail.com> wrote:
> > Interesting case.  So I think the root of the problem is the same as
> > what we have for a column is marked unique to the subscriber but not
> > to the publisher.  In short, two transactions which are independent of
> > each other on the publisher are dependent on each other on the
> > subscriber side because table definition is different on the
> > subscriber.  So can't we handle this case in the same way by marking
> > this table unsafe for parallel-apply?
> >
>
> Yes, we can do that. I think Hou-San has already dealt that way in his
> latest patch [1]. See his response in the email [1]: "Disallow
> replicating from or to a partitioned table in parallel streaming
> mode".
>
> [1] - https://www.postgresql.org/message-id/OS0PR01MB57160760B34E1655718F4D1994249%40OS0PR01MB5716.jpnprd01.prod.outlook.com

Okay, somehow I missed the latest email.  I will look into it soon.

-- 
Regards,
Dilip Kumar
EnterpriseDB: http://www.enterprisedb.com

Commits

Same data as JSON: GET /api/v1/messages/:b64id/commits the thread's linked commits as JSON, with link sources. API reference →

  1. Fix invalid memory access during the shutdown of the parallel apply worker.

  2. Fix assertion failure in apply worker.

  3. Use elog to report unexpected action in handle_streamed_transaction().

  4. Use appropriate wait event when sending data in the apply worker.

  5. Allow the logical_replication_mode to be used on the subscriber.

  6. Rename GUC logical_decoding_mode to logical_replication_mode.

  7. Display the leader apply worker's PID for parallel apply workers.

  8. Improve the code to decide and process the apply action.

  9. Document the newly added wait events added by commit 216a784829.

  10. Perform apply of large transactions by parallel workers.

  11. Wake up a subscription's replication worker processes after DDL.

  12. Add copyright notices to meson files

  13. Better document logical replication parameters

  14. Add a common function to generate the origin name.

  15. Harmonize parameter names in storage and AM code.

  16. Avoid using list_length() to test for empty list.

  17. Improve two comments related to a boolean DefElem's value

  18. Fix partition table's REPLICA IDENTITY checking on the subscriber.

  19. Fix data inconsistency between publisher and subscriber.

  20. Fix cache look-up failures while applying changes in logical replication.