Horton

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

Amit Kapila <amit.kapila16@gmail.com>

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From: Amit Kapila <amit.kapila16@gmail.com>
To: "osumi.takamichi@fujitsu.com" <osumi.takamichi@fujitsu.com>
Cc: Peter Smith <smithpb2250@gmail.com>, Ajin Cherian <itsajin@gmail.com>, PostgreSQL Hackers <pgsql-hackers@postgresql.org>
Date: 2021-02-12T10:37:17Z
Lists: pgsql-hackers 
On Fri, Feb 12, 2021 at 12:29 PM osumi.takamichi@fujitsu.com
<osumi.takamichi@fujitsu.com> wrote:
>
> On Thursday, February 11, 2021 5:10 PM Peter Smith <smithpb2250@gmail.com> wrote:
> > Please find attached the new 2PC patch set v39*
> I started to review the patchset
> so, let me give some comments I have at this moment.
>
> (1)
>
> File : v39-0007-Support-2PC-txn-tests-for-concurrent-aborts.patch
> Modification :
>
> @@ -620,6 +666,9 @@ pg_decode_change(LogicalDecodingContext *ctx, ReorderBufferTXN *txn,
>         }
>         txndata->xact_wrote_changes = true;
>
> +       /* For testing concurrent  aborts */
> +       test_concurrent_aborts(data);
> +
>         class_form = RelationGetForm(relation);
>         tupdesc = RelationGetDescr(relation);
>
> Comment : There are unnecessary whitespaces in comments like above in v37-007
> Please check such as pg_decode_change(), pg_decode_truncate(), pg_decode_stream_truncate() as well.
> I suggest you align the code formats by pgindent.
>

This patch (v39-0007-Support-2PC-txn-tests-for-concurrent-aborts.patch)
is mostly for dev-testing purpose. We don't intend to commit as this
has a lot of timing-dependent tests and I am not sure if it is
valuable enough at this stage. So, we can ignore cosmetic comments in
this patch for now.

-- 
With Regards,
Amit Kapila.

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