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RE: Perform streaming logical transactions by background workers and parallel apply

Yu Shi (Fujitsu) <shiy.fnst@fujitsu.com>

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From: "shiy.fnst@fujitsu.com" <shiy.fnst@fujitsu.com>
To: "houzj.fnst@fujitsu.com" <houzj.fnst@fujitsu.com>, Peter Smith <smithpb2250@gmail.com>
Cc: Amit Kapila <amit.kapila16@gmail.com>, PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>
Date: 2022-04-29T05:22:41Z
Lists: pgsql-hackers

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On Fri, Apr 29, 2022 10:07 AM Hou, Zhijie/侯 志杰 <houzj.fnst@fujitsu.com> wrote:
> 
> I addressed the rest of Peter's comments and here is a new version patch.
> 

Thanks for your patch.

The patch modified streaming option in logical replication, it can be set to
'on', 'off' and 'apply'. The new option 'apply' haven't been tested in the tap test.
Attach a patch which modified the subscription tap test to cover both 'on' and
'apply' option. (The main patch is also attached to make cfbot happy.)

Besides, I noticed that for two-phase commit transactions, if the transaction is
prepared by a background worker, the background worker would be asked to handle
the message about commit/rollback this transaction. Is it possible that the
messages about commit/rollback prepared transaction are handled by apply worker
directly?

Regards,
Shi yu

Commits

Same data as JSON: GET /api/v1/messages/:b64id/commits the thread's linked commits as JSON, with link sources. API reference →

  1. Fix invalid memory access during the shutdown of the parallel apply worker.

  2. Fix assertion failure in apply worker.

  3. Use elog to report unexpected action in handle_streamed_transaction().

  4. Use appropriate wait event when sending data in the apply worker.

  5. Allow the logical_replication_mode to be used on the subscriber.

  6. Rename GUC logical_decoding_mode to logical_replication_mode.

  7. Display the leader apply worker's PID for parallel apply workers.

  8. Improve the code to decide and process the apply action.

  9. Document the newly added wait events added by commit 216a784829.

  10. Perform apply of large transactions by parallel workers.

  11. Wake up a subscription's replication worker processes after DDL.

  12. Add copyright notices to meson files

  13. Better document logical replication parameters

  14. Add a common function to generate the origin name.

  15. Harmonize parameter names in storage and AM code.

  16. Avoid using list_length() to test for empty list.

  17. Improve two comments related to a boolean DefElem's value

  18. Fix partition table's REPLICA IDENTITY checking on the subscriber.

  19. Fix data inconsistency between publisher and subscriber.

  20. Fix cache look-up failures while applying changes in logical replication.