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In-Reply-To: <5778.1764660480@localhost>
From: Mihail Nikalayeu <mihailnikalayeu@gmail.com>
Date: Tue, 2 Dec 2025 11:27:00 +0100
Message-ID: 
 <CADzfLwXMzv4_2Mc54qpASJ7FrKwQ6OsG0d9GxiYDxEKZ2KqHSA@mail.gmail.com>
Subject: Re: Revisiting {CREATE INDEX, REINDEX} CONCURRENTLY improvements
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>
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Precedence: bulk

Hello, Antonin!

On Tue, Dec 2, 2025 at 8:28=E2=80=AFAM Antonin Houska <ah@cybertec.at> wrot=
e:
> 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 rewo=
rk
> REPACK (CONCURRENTLY) from scratch so that it does not use logical decodi=
ng
> 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 CI=
C?
* 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,