Horton

Re: Revisiting {CREATE INDEX, REINDEX} CONCURRENTLY improvements

Mikhail Nikalayeu <mihailnikalayeu@gmail.com>

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From: Mihail Nikalayeu <mihailnikalayeu@gmail.com>
To: Antonin Houska <ah@cybertec.at>
Cc: Hannu Krosing <hannuk@google.com>, Matthias van de Meent <boekewurm+postgres@gmail.com>, Sergey Sargsyan <sergey.sargsyan.2001@gmail.com>, alvherre@kurilemu.de, Andres Freund <andres@anarazel.de>, Michael Paquier <michael@paquier.xyz>, PostgreSQL Hackers <pgsql-hackers@postgresql.org>, Andrey Borodin <amborodin86@gmail.com>, Melanie Plageman <melanieplageman@gmail.com>
Date: 2025-12-02T10:27:00Z
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 →

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

  2. VACUUM: ignore indexing operations with CONCURRENTLY

  3. Avoid spurious waits in concurrent indexing

Hello, Antonin!

On Tue, Dec 2, 2025 at 8:28 AM Antonin Houska <ah@cybertec.at> wrote:
> I suppose you don't want to use logical decoding for CIC, do you? How can then
> it be "the same" like in REPACK (CONCURRENTLY)? Or do you propose to rework
> REPACK (CONCURRENTLY) from scratch so that it does not use logical decoding
> either?

My logic here chain is next:
* looks like we may reuse snapshot reset technique for REPACK, using
LR+some tricks
* if it worked, why should we use reset technique + STIR (not LR too) in CIC?
* mostly because it is not possible to active LR for some of tables
* but there is (your) patch what aims to add the ability to activate
LR for any table
* if it worked - it feels natural to replace STIR by LR to keep things
looking the same and working the same way

While STIR may be more efficient and simple for CIC - it is still an
additional entity in the PG domain, so LR may be a better solution
from a system design perspective.

But it is only thought so far, because I have not yet proved reset
snapshot is possible for REPACK (need to do some POC at least).
What do you think?

Also, I think I'll extract reset-snapshot for CIC in a separate CF
entry, since it still may be used with or without either STIR or LR.

Best regards,
MIkhail,