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Re: Adding REPACK [concurrently]

Srinath Reddy Sadipiralla <srinath2133@gmail.com>

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From: Srinath Reddy Sadipiralla <srinath2133@gmail.com>
To: Alvaro Herrera <alvherre@alvh.no-ip.org>
Cc: Antonin Houska <ah@cybertec.at>, Amit Kapila <amit.kapila16@gmail.com>, Mihail Nikalayeu <mihailnikalayeu@gmail.com>, Matthias van de Meent <boekewurm+postgres@gmail.com>, Pg Hackers <pgsql-hackers@lists.postgresql.org>, Robert Treat <rob@xzilla.net>
Date: 2026-04-04T13:16:58Z
Lists: pgsql-hackers 
Hi Alvaro,

On Sat, Apr 4, 2026 at 1:01 AM Alvaro Herrera <alvherre@alvh.no-ip.org>
wrote:

> On 2026-Apr-03, Alvaro Herrera wrote:
>
> > - I polished the patch to reserve replication slots for REPACK.  Given
> >   the new implementation of 0006 that was submitted implies that we can
> >   now run multiple repacks concurrently, I changed the default of 1 to 5.
>
> Srinath let me know that this new part was causing CI failures on
> Windows.  This version v51 should be okay (or, at least, it passes for
> me on CI).


yes indeed , TotalMaxReplicationSlots was the culprit , as the window
after getting repack worked was forked , i think this was set back to 0.
Thanks for fixing this with "repack" flag , initially i thought why can't we
go with a macro
#define TotalMaxReplicationSlots (max_replication_slots +
max_repack_replication_slots)
but i thought maybe in future we might need this "repack" flag to add
more slot requirements.

-- 
Thanks,
Srinath Reddy Sadipiralla
EDB: https://www.enterprisedb.com/

Commits

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

  1. Allow old WAL recycling during REPACK CONCURRENTLY

  2. Advance restart_lsn more eagerly in LogicalConfirmReceivedLocation

  3. Remove unnecessary signal handler change

  4. Improve REPACK (CONCURRENTLY) error messages some more

  5. Revert "Allow logical replication snapshots to be database-specific"

  6. Move REPACK (CONCURRENTLY) test out of stock regression tests

  7. REPACK: do not require REPLICATION or LOGIN

  8. Add missing initialization

  9. Simplify declaration of memcpy target

  10. Reserve replication slots specifically for REPACK

  11. doc: Add an example of REPACK (CONCURRENTLY)

  12. Allow logical replication snapshots to be database-specific

  13. Avoid different-size pointer-to-integer cast

  14. Fix valgrind failure

  15. Add CONCURRENTLY option to REPACK

  16. Rename cluster.c to repack.c (and corresponding .h)

  17. Allow index_create to suppress index_build progress reporting

  18. Make index_concurrently_create_copy more general

  19. Document the 'command' column of pg_stat_progress_repack

  20. Introduce the REPACK command

  21. Toggle logical decoding dynamically based on logical slot presence.

  22. Split vacuumdb to create vacuuming.c/h

  23. Remove ReorderBufferTupleBuf structure.

  24. Revert changes to CONCURRENTLY that "sped up" Xmin advance

  25. VACUUM: ignore indexing operations with CONCURRENTLY