Re: Adding REPACK [concurrently]

Antonin Houska <ah@cybertec.at>

From: Antonin Houska <ah@cybertec.at>

To: Mihail Nikalayeu <mihailnikalayeu@gmail.com>

Cc: Alvaro Herrera <alvherre@alvh.no-ip.org>, Pg Hackers <pgsql-hackers@lists.postgresql.org>, Robert Treat <rob@xzilla.net>, Fujii Masao <masao.fujii@gmail.com>

Date: 2025-09-01T05:12:11Z

Lists: pgsql-hackers

Commits

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

Improve REPACK (CONCURRENTLY) error messages some more
- 378dffaf8c80 19 (unreleased) landed
Add CONCURRENTLY option to REPACK
- 28d534e2ae0a 19 (unreleased) landed
Make index_concurrently_create_copy more general
- 33bf7318f94c 19 (unreleased) landed
Document the 'command' column of pg_stat_progress_repack
- a630ac5c2016 19 (unreleased) landed
Introduce the REPACK command
- ac58465e0618 19 (unreleased) landed
Split vacuumdb to create vacuuming.c/h
- c4067383cb2c 19 (unreleased) landed
Revert changes to CONCURRENTLY that "sped up" Xmin advance
- 042b584c7f7d 14.4 cited

Mihail Nikalayeu <mihailnikalayeu@gmail.com> wrote:

> Hello!
> 
> I started an attempt to make a "lightweight" MVCC-safe prototype and
> stuck into the "it is not working" issue.
> After some debugging I realized Antonin's variant (catalog-mode based)
> seems to be broken also...
> 
> And after a few more hours I realized non-MVCC is broken as well :)
> 
> This is a patch with a test to reproduce the issue related to repack +
> concurrent modifications.
> Seems like some updates may be lost.
> 
> I hope the patch logic is clear - but feel free to ask if not.

Are you sure the test is complete? I see no occurrence of the REPACK command
in it.

-- 
Antonin Houska
Web: https://www.cybertec-postgresql.com