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

Wei Wang (Fujitsu) <wangw.fnst@fujitsu.com>

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From: "wangw.fnst@fujitsu.com" <wangw.fnst@fujitsu.com>
To: Amit Kapila <amit.kapila16@gmail.com>, Masahiko Sawada <sawada.mshk@gmail.com>
Cc: Peter Smith <smithpb2250@gmail.com>, "shiy.fnst@fujitsu.com" <shiy.fnst@fujitsu.com>, "houzj.fnst@fujitsu.com" <houzj.fnst@fujitsu.com>, PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>
Date: 2022-06-14T03:37:04Z
Lists: pgsql-hackers

Attachments

On Wed, Jun 8, 2022 3:13 PM I wrote:
> Attach the new patches.(only changed 0001 and 0003)

I tried to improve the patches by following points:

1. Initialize variable include_abort_lsn to false. It reports a warning in
cfbot. (see patch v10-0001)
BTW, I merged the patch that added the new GUC (see v9-0004) into patch 0001.

2. Because of the improvement #2 in [1], the foreign key could not be detected
when checking trigger function. So added additional checks for the foreign key.
(see patch 0004)

3. Adding a check for the partition table when trying to apply changes in the
apply background worker. (see patch 0004)
In additional, the partition cache map on subscriber have several bugs (see
thread [2]). Because patch 0004 is developed based on the patches in [2], so I
merged the patches(v4-0001~v4-0003) in [2] into a temporary patch 0003 here.
After the patches in [2] is committed, I will delete patch 0003 and rebase
patch 0004.

4. Improve constraint checking in a separate patch as suggested by Amit-san in
[3] #6.(see patch 0005)
I added a new field "bool subretry" in catalog pg_subscription. I use this
field to indicate whether the transaction that we are going to process has
failed before.
If apply worker/bgworker was exit with an error, this field will be set to
true; If we successfully apply a transaction, this field will be set to false.
If we retry to apply a streaming transaction, whether the user sets the
streaming option to "on" or "apply", we will apply the transaction in the apply
worker.

Attach the new patches.
Only changed patches 0001, 0004 and added new separate patch 0005.

[1] - https://www.postgresql.org/message-id/OS3PR01MB6275208A2F8ED832710F65E09EA49%40OS3PR01MB6275.jpnprd01.prod.outlook.com
[2] - https://www.postgresql.org/message-id/flat/OSZPR01MB6310F46CD425A967E4AEF736FDA49%40OSZPR01MB6310.jpnprd01.prod.outlook.com
[3] - https://www.postgresql.org/message-id/CAA4eK1Jt08SYbRt_-rbSWNg%3DX9-m8%2BRdP5PosfnQgyF-z8bkxQ%40mail.gmail.com

Regards,
Wang wei

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.