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

Peter Smith <smithpb2250@gmail.com>

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From: Peter Smith <smithpb2250@gmail.com>
To: Amit Kapila <amit.kapila16@gmail.com>
Cc: "houzj.fnst@fujitsu.com" <houzj.fnst@fujitsu.com>, Masahiko Sawada <sawada.mshk@gmail.com>, "wangw.fnst@fujitsu.com" <wangw.fnst@fujitsu.com>, Dilip Kumar <dilipbalaut@gmail.com>, "shiy.fnst@fujitsu.com" <shiy.fnst@fujitsu.com>, PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>
Date: 2022-12-20T06:22:32Z
Lists: pgsql-hackers 
On Tue, Dec 20, 2022 at 2:20 PM Amit Kapila <amit.kapila16@gmail.com> wrote:
>
> On Tue, Dec 20, 2022 at 8:17 AM Peter Smith <smithpb2250@gmail.com> wrote:
> >
> > Summary
> > -------
> >
> > In summary, everything I have tested so far appeared to be working
> > properly. In other words, for overlapping streamed transactions of
> > different kinds, and regardless of whether zero/some/all of those
> > transactions are getting processed by a PA worker, the resulting
> > replicated data looked consistently OK.
> >
>
> Thanks for doing the detailed testing of this patch. I think the one
> area where we can focus more is the switch-to-serialization mode while
> sending changes to the parallel worker.
>
> >
> > NOTE - all testing described in this post above was using v58-0001
> > only. However, the point of implementing these as a .spec test was to
> > be able to repeat these same regression tests on newer versions with
> > minimal manual steps required. Later I plan to fetch/apply the most
> > recent patch version and repeat these same tests.
> >
>
> That would be really helpful.
>

FYI, my pub-sub.spec tests gave the same result (i.e. pass) when
re-run against the latest v62-0001 (parallel apply base patch) and
v62-0004 (GUC 'force_stream_mode' patch).

------
Kind Regards,
Peter Smith.
Fujitsu Australia

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.