Horton

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

Masahiko Sawada <sawada.mshk@gmail.com>

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From: Masahiko Sawada <sawada.mshk@gmail.com>
To: Peter Smith <smithpb2250@gmail.com>
Cc: PostgreSQL Hackers <pgsql-hackers@postgresql.org>
Date: 2020-12-03T06:33:40Z
Lists: pgsql-hackers 
On Wed, Dec 2, 2020 at 8:24 PM Peter Smith <smithpb2250@gmail.com> wrote:
>
> I have rebased the v28 patch set (made necessary due to recent commit [1])
> [1] https://github.com/postgres/postgres/commit/0926e96c493443644ba8e96b5d96d013a9ffaf64
>
> And at the same time I have added patch 0009 to this set - This is for
> the new SUBSCRIPTION option "two_phase" (0009 is still WIP but
> stable).
>
> PSA new patch set with version bumped to v29.

Thank you for updating the patch!

While looking at the patch set I found that the tests in
src/test/subscription don't work with this patch. I got the following
error:

2020-12-03 15:18:12.666 JST [44771] tap_sub ERROR:  unrecognized
pgoutput option: two_phase
2020-12-03 15:18:12.666 JST [44771] tap_sub CONTEXT:  slot "tap_sub",
output plugin "pgoutput", in the startup callback
2020-12-03 15:18:12.666 JST [44771] tap_sub STATEMENT:
START_REPLICATION SLOT "tap_sub" LOGICAL 0/0 (proto_version '2',
two_phase 'on', publication_names '"tap_pub","tap_pub_ins_only"')

In v29-0009 patch "two_phase" option is added on the subscription side
(i.g., libpqwalreceiver) but it seems not on the publisher side
(pgoutput).

Regards,

-- 
Masahiko Sawada
EnterpriseDB:  https://www.enterprisedb.com/

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