Horton

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

Andres Freund <andres@anarazel.de>

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From: Andres Freund <andres@anarazel.de>
To: Petr Jelinek <petr.jelinek@2ndquadrant.com>
Cc: Nikhil Sontakke <nikhils@2ndquadrant.com>, Robert Haas <robertmhaas@gmail.com>, Tomas Vondra <tomas.vondra@2ndquadrant.com>, David Steele <david@pgmasters.net>, Andrew Dunstan <andrew.dunstan@2ndquadrant.com>, Simon Riggs <simon@2ndquadrant.com>, Craig Ringer <craig@2ndquadrant.com>, Peter Eisentraut <peter.eisentraut@2ndquadrant.com>, Sokolov Yura <y.sokolov@postgrespro.ru>, Stas Kelvich <s.kelvich@postgrespro.ru>, Dmitry Dolgov <9erthalion6@gmail.com>, Tom Lane <tgl@sss.pgh.pa.us>, Masahiko Sawada <sawada.mshk@gmail.com>, PostgreSQL Hackers <pgsql-hackers@postgresql.org>
Date: 2018-08-01T20:01:23Z
Lists: pgsql-hackers 
On 2018-08-01 21:55:18 +0200, Petr Jelinek wrote:
> On 01/08/18 16:00, Nikhil Sontakke wrote:
> > 
> >> I was wondering if anything else would be needed for user-defined
> >> catalog tables..
> >>
> > 
> > We don't need to do anything else for user-defined catalog tables
> > since they will also get accessed via the systable_* scan APIs.
> > 
> 
> They can be, but currently they might not be. So this requires at least
> big fat warning in docs and description on how to access user catalogs
> from plugins correctly (ie to always use systable_* API on them). It
> would be nice if we could check for it in Assert builds at least.

Yea, I agree. I think we should just consider putting similar checks in
the general scan APIs. With an unlikely() and the easy predictability of
these checks, I think we should be fine, overhead-wise.

Greetings,

Andres Freund

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