Horton

RE: [HACKERS] logical decoding of two-phase transactions

Takamichi Osumi (Fujitsu) <osumi.takamichi@fujitsu.com>

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From: "osumi.takamichi@fujitsu.com" <osumi.takamichi@fujitsu.com>
To: 'Amit Kapila' <amit.kapila16@gmail.com>, Ajin Cherian <itsajin@gmail.com>
Cc: Peter Smith <smithpb2250@gmail.com>, PostgreSQL Hackers <pgsql-hackers@postgresql.org>
Date: 2021-03-21T10:58:20Z
Lists: pgsql-hackers

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Hello


On Sunday, March 21, 2021 4:37 PM Amit Kapila <amit.kapila16@gmail.com>
> On Sat, Mar 20, 2021 at 10:09 AM Ajin Cherian <itsajin@gmail.com> wrote:
> >
> > On Sat, Mar 20, 2021 at 1:35 AM Amit Kapila <amit.kapila16@gmail.com>
> wrote:
> >>
> >> On Fri, Mar 19, 2021 at 5:03 AM Ajin Cherian <itsajin@gmail.com> wrote:
> >> >
> >> > Missed the patch - 0001, resending.
> >> >
> >>
> >> I have made miscellaneous changes in the patch which includes
> >> improving comments, error messages, and miscellaneous coding
> >> improvements. The most notable one is that we don't need an
> >> additional parameter in walrcv_startstreaming, if the two_phase
> >> option is set properly. My changes are in
> >> v63-0002-Misc-changes-by-Amit, if you are fine with those, then
> >> please merge them in the next version. I have omitted the dev-logs
> >> patch but feel free to submit it. I have one
> >> question:
> >>
> >
> > I am fine with these changes. I see that Peter has already merged in these
> changes.
> >
> 
> I have further updated the patch to implement unique GID on the
> subscriber-side as discussed in the nearby thread [1]. That requires some
> changes in the test.
Thank you for your update. v65 didn't make any failure during make check-world.

I've written additional tests for alter subscription using refresh
for enabled subscription and two_phase = on.
I wrote those as TAP tests because refresh requires enabled subscription
and to get a subscription enabled, we need to set connect true as well.

TAP tests are for having connection between sub and pub,
and tests in subscription.sql are aligned with connect=false. 

Just in case, I ran 020_twophase.pl with this patch 100 times, based on v65 as well
and didn't cause any failure. Please have a look at the attached patch.


Best Regards,
	Takamichi Osumi

Commits

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

  2. Doc: minor improvements for logical replication protocol documentation.

  3. Fix test failure in 021_twophase.pl.

  4. Refactor to make common functions in proto.c and worker.c.

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

  6. Fix potential buffer overruns in proto.c.

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

  8. Refactor function parse_subscription_options.

  9. Allow enabling two-phase option via replication protocol.

  10. Don't use Asserts to check for violations of replication protocol.

  11. Improve psql tab completion for options of subcriptions and publications

  12. Rearrange logrep worker's snapshot handling some more.

  13. doc: Update information of new messages for logical replication.

  14. ALTER SUBSCRIPTION ... ADD/DROP PUBLICATION

  15. Allow pgoutput to send logical decoding messages.

  16. Refactor function parse_output_parameters.

  17. Avoid repeated decoding of prepared transactions after a restart.

  18. Fix an oversight in ReorderBufferFinishPrepared.

  19. Allow multiple xacts during table sync in logical replication.

  20. Fix replication of in-progress transactions in tablesync worker.

  21. Fix 'skip-empty-xacts' option in test_decoding for streaming mode.

  22. Use Enum for top level logical replication message types.

  23. Add support for streaming to built-in logical replication.

  24. Fix the logical streaming test.

  25. Implement streaming mode in ReorderBuffer.

  26. Extend the logical decoding output plugin API with stream methods.

  27. Store 2PC GID in commit/abort WAL recs for logical decoding