Re: Add mode column to pg_stat_progress_vacuum

From: Sami Imseih <samimseih(at)gmail(dot)com>
To: maciek(at)sakrejda(dot)org
Cc: Shinya Kato <shinya11(dot)kato(at)gmail(dot)com>, Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com>, Nathan Bossart <nathandbossart(at)gmail(dot)com>, Robert Treat <rob(at)xzilla(dot)net>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Add mode column to pg_stat_progress_vacuum
Date: 2025-11-20 01:34:19
Message-ID: CAA5RZ0suoicwxFeK_eDkUrzF7s0BVTaE7M+ehCpYcCk5wiECpw@mail.gmail.com
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Hi,

The patch looks overall good to me. I have a few comments:

1/ I believe It is possible for the mode to flip to "failsafe" during the
operation since lazy_check_wraparound_failsafe() is checked in-flight.
I think this should be mentioned in the "mode" section of the documentation
in the "failsafe" description.

2/ It feels odd that we do not have parity of the "mode" column in
pg_stat_progress_analyze. Should we add a "mode" column
there also that shows if the analyze was triggered_by "manual" or
"autovacuum"? An autovacuum in a relation can trigger both
a vacuum and an analyze, and a VACUUM(ANALYZE) will
also do both.

--
Sami Imseih
Amazon Web Services (AWS)

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