public inbox for [email protected]
help / color / mirror / Atom feedFrom: Maxim Orlov <[email protected]>
To: Heikki Linnakangas <[email protected]>
Cc: wenhui qiu <[email protected]>
Cc: Alexander Korotkov <[email protected]>
Cc: Postgres hackers <[email protected]>
Subject: Re: POC: make mxidoff 64 bits
Date: Tue, 7 Jan 2025 13:23:59 +0300
Message-ID: <CACG=ezZwdvsijzuXE3hex3xHcoz75EQYBXRTsQJVwbo5J5sS3g@mail.gmail.com> (raw)
In-Reply-To: <[email protected]>
References: <CACG=ezaWg7_nt-8ey4aKv2w9LcuLthHknwCawmBgEeTnJrJTcw@mail.gmail.com>
<CACG=ezaMncd0-BcGHBgsSR2eqHfrz9WznHGLKX8biz6zu-azGw@mail.gmail.com>
<[email protected]>
<CACG=ezb9XTvd3ZmS0y8gUunx_wBBdJO7ou+BfCOnnA5jE-11vg@mail.gmail.com>
<CACG=ezYFNqGjsxF6Vb2CHF6JzKcjhAFauaFm9js0nu_3Ngcdkw@mail.gmail.com>
<CAGjGUA+dcV7veaCV1H65vCNsbS++nT8=ho772gDvsXUW9H7eXQ@mail.gmail.com>
<CACG=ezYThNkf8QsDA-aQfEFEkqn2L=_uUL83z0vJstPRasbZqg@mail.gmail.com>
<[email protected]>
<CACG=ezYtCatcRODS-ZkwhcxuqBKCuhEsZGBruw=dGCLoepF+ZA@mail.gmail.com>
<[email protected]>
<CACG=ezb680eb=JXh1ns=t5eGH3h9y-uTfT4tf3Xc8t2UH2q6tQ@mail.gmail.com>
<CACG=ezZGQFBb0yepka8hU2BmJ48ujt3xa+aYLNL0BQPx0vqwZg@mail.gmail.com>
<CACG=ezajc_Pcqmy6fcq-N8+LzCRMzOzJzez2_BgHEu-6RVJtKQ@mail.gmail.com>
<[email protected]>
<CACG=ezbKwypBp=14q9+hMQApus3=1hKxJ9x1+KinUhtT48570Q@mail.gmail.com>
<[email protected]>
On Thu, 2 Jan 2025 at 01:12, Heikki Linnakangas <[email protected]> wrote:
>
> It might be best to just refuse the upgrade if oldestOffsetKnown==false.
> It's a very ancient corner case. It seems reasonable to require you to
> upgrade to a newer minor version and run VACUUM before upgrading. IIRC
> that sets oldestOffsetKnown.
>
I agree. After all, we do already have a ready-made solution in the form
of a vacuum, do we?
If I understand all this multixact_old.c machinery correctly, in case of
oldestOffsetKnown==false
we should fail with "could not open file" or offset will be 0 in
GetOldMultiXactIdSingleMember.
So, I suppose we can put an analogue of SimpleLruDoesPhysicalPageExist call
in the beginning
of GetOldMultiXactIdSingleMember. And if either
SimpleLruDoesPhysicalPageExist return false
or a corresponding offset will be 0 we have to bail out with "oldest offset
does not exist, consider
running vacuum before pg_upgrdade" or smth. Please, correct me if I'm wrong.
--
Best regards,
Maxim Orlov.
view thread (5+ messages) latest in thread
reply
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Reply to all the recipients using the --to and --cc options:
reply via email
To: [email protected]
Cc: [email protected], [email protected], [email protected], [email protected], [email protected]
Subject: Re: POC: make mxidoff 64 bits
In-Reply-To: <CACG=ezZwdvsijzuXE3hex3xHcoz75EQYBXRTsQJVwbo5J5sS3g@mail.gmail.com>
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
This inbox is served by agora; see mirroring instructions
for how to clone and mirror all data and code used for this inbox