Horton

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

Takamichi Osumi (Fujitsu) <osumi.takamichi@fujitsu.com>

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From: "osumi.takamichi@fujitsu.com" <osumi.takamichi@fujitsu.com>
To: 'Peter Smith' <smithpb2250@gmail.com>, Amit Kapila <amit.kapila16@gmail.com>
Cc: Ajin Cherian <itsajin@gmail.com>, PostgreSQL Hackers <pgsql-hackers@postgresql.org>
Date: 2021-02-12T06:59:28Z
Lists: pgsql-hackers 
Hi


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.

(2)

File : v39-0006-Support-2PC-txn-Subscription-option.patch

@@ -213,6 +219,15 @@ parse_subscription_options(List *options,
                        *streaming_given = true;
                        *streaming = defGetBoolean(defel);
                }
+               else if (strcmp(defel->defname, "two_phase") == 0 && twophase)
+               {
+                       if (*twophase_given)
+                               ereport(ERROR,
+                                               (errcode(ERRCODE_SYNTAX_ERROR),
+                                                errmsg("conflicting or redundant options")));
+                       *twophase_given = true;
+                       *twophase = defGetBoolean(defel);
+               }

You can add this test in subscription.sql easily with double twophase options.

When I find something else, I'll let you know.

Best Regards,
	Takamichi Osumi

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