Horton

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

Ajin Cherian <itsajin@gmail.com>

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From: Ajin Cherian <itsajin@gmail.com>
To: Peter Smith <smithpb2250@gmail.com>
Cc: Greg Nancarrow <gregn4422@gmail.com>, Amit Kapila <amit.kapila16@gmail.com>, "tanghy.fnst@fujitsu.com" <tanghy.fnst@fujitsu.com>, vignesh C <vignesh21@gmail.com>, PostgreSQL Hackers <pgsql-hackers@postgresql.org>
Date: 2021-06-17T14:09:50Z
Lists: pgsql-hackers

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On Wed, Jun 16, 2021 at 9:08 AM Peter Smith <smithpb2250@gmail.com> wrote:
>
> On Fri, Jun 11, 2021 at 6:34 PM Peter Smith <smithpb2250@gmail.com> wrote:
>
> > KNOWN ISSUES: This v85 patch was built and tested using yesterday's
> > master, but due to lots of recent activity in the replication area I
> > expect it will be broken for HEAD very soon (if not already). I'll
> > rebase it again ASAP to try to keep it in working order.
> >
>
> Please find attached the latest patch set v86*


I've modified the patchset based on comments received on thread [1]
for the CREATE_REPLICATION_SLOT
changes. Based on the request from that thread, I've taken out those
changes as two new patches (patch-1 and patch-2)
and made this into 5 patches. I've also changed the logic to align
with the changes in the command syntax.

I've also addressed one pending comment from Amit about
CreateInitDecodingContext, I've taken out the logic that
sets slot->data.two_phase, and only kept the logic that sets ctx->twophase.

Before:

- ctx->twophase &= MyReplicationSlot->data.two_phase;
+ ctx->twophase &= (ctx->twophase_opt_given || slot->data.two_phase);
+
+ /* Mark slot to allow two_phase decoding if not already marked */
+ if (ctx->twophase && !slot->data.two_phase)
+ {
+ slot->data.two_phase = true;
+ ReplicationSlotMarkDirty();
+ ReplicationSlotSave();
+ }

After:

- ctx->twophase &= MyReplicationSlot->data.two_phase;
+ ctx->twophase &= slot->data.two_phase;


[1] - https://postgr.es/m/64b9f783c6e125f18f88fbc0c0234e34e71d8639.camel@j-davis.com

regards,
Ajin Cherian
Fujitsu Australia

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