Horton

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

Amit Kapila <amit.kapila16@gmail.com>

View thread View on postgr.es
From: Amit Kapila <amit.kapila16@gmail.com>
To: Ajin Cherian <itsajin@gmail.com>
Cc: Peter Smith <smithpb2250@gmail.com>, PostgreSQL Hackers <pgsql-hackers@postgresql.org>
Date: 2020-11-21T13:32:53Z
Lists: pgsql-hackers

Attachments

On Fri, Nov 20, 2020 at 4:54 PM Ajin Cherian <itsajin@gmail.com> wrote:
>
> On Fri, Nov 20, 2020 at 2:48 PM Amit Kapila <amit.kapila16@gmail.com> wrote:
> >
> > I'll take care of it along with other changes.
> >
> > Thanks for the confirmation.
> >
>
> Ok, meanwhile I've just split the patches to move out the
> check_xid_aborted test cases as well as the support in the code for
> this into a separate patch. New 0007 patch for this.
>

This makes sense to me but it should have been 0004 in the series. I
have changed the order in the attached. I have updated
0002-Support-2PC-txn-backend and
0007-2pc-test-cases-for-testing-concurrent-aborts. The changes are:
1. As mentioned previously, used ReorderBufferResetTxn to deal with
concurrent aborts both in case of streamed and prepared txns.
2. There was no clear explanation as to why we are not skipping
DecodePrepare in the presence of concurrent aborts. I have added the
explanation of the same atop DecodePrepare() and at various other
palces.
3. Added/Edited comments at various places in the code and made some
other changes like simplified the code at a few places.
4. Changed the function name ReorderBufferCommitInternal to
ReorderBufferReplay as that seems more appropriate.
5. In ReorderBufferReplay()(which was previously
ReorderBufferCommitInternal), the patch was doing cleanup of TXN even
for prepared transactions which is not consistent with what we do at
other places in the patch, so changed the same.
6. In 2pc-test-cases-for-testing-concurrent-aborts, changed one of the
log message based on the changes in patch Support-2PC-txn-backend.

I am planning to continue review of these patches but I thought it is
better to check about the above changes before proceeding further. Let
me know what you think?

-- 
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