public inbox for [email protected]
help / color / mirror / Atom feedFrom: Maxim Orlov <[email protected]>
To: Heikki Linnakangas <[email protected]>
Cc: Alvaro Herrera <[email protected]>
Cc: Alexander Korotkov <[email protected]>
Cc: wenhui qiu <[email protected]>
Cc: Postgres hackers <[email protected]>
Cc: Ashutosh Bapat <[email protected]>
Subject: Re: POC: make mxidoff 64 bits
Date: Wed, 26 Nov 2025 18:23:18 +0300
Message-ID: <CACG=ezY0=ri8A0duXbpd1XNUc1jnngaPnmB0-+UZpxAv7-fNtw@mail.gmail.com> (raw)
In-Reply-To: <[email protected]>
References: <CACG=ezaWg7_nt-8ey4aKv2w9LcuLthHknwCawmBgEeTnJrJTcw@mail.gmail.com>
<[email protected]>
<CACG=ezbKwypBp=14q9+hMQApus3=1hKxJ9x1+KinUhtT48570Q@mail.gmail.com>
<[email protected]>
<CACG=ezZwdvsijzuXE3hex3xHcoz75EQYBXRTsQJVwbo5J5sS3g@mail.gmail.com>
<CACG=ezbs912S58=uR17b4w8uuWv1=OcCRaTW_OWdFm4+tXZA6w@mail.gmail.com>
<CAGjGUA+BfcWyccNN4=tHsW_E-koRxbg8h8ut6hjvPsHMgmek6w@mail.gmail.com>
<CACG=ezYbYO_KHWdeDedbDcY0tOS0JfaqBxG3=bG5+DdsDK4MpQ@mail.gmail.com>
<CACG=ezYpZRPwoRCz_h3Qerd3XJNdpTHCpwGbZphNdy26tA4_qQ@mail.gmail.com>
<[email protected]>
<[email protected]>
<CACG=ezYUJSvnuxntkURNWo_1vZ+AtmcQfqd_h6WgDzGaudfw+Q@mail.gmail.com>
<[email protected]>
<[email protected]>
<CAExHW5tUEkiQrvm9hgccjKUNkWBnJ5_HDUrAwiHBTxu+Vuj29Q@mail.gmail.com>
<[email protected]>
<[email protected]>
On Tue, 25 Nov 2025 at 13:07, Heikki Linnakangas <[email protected]> wrote:
>
> GetOldMultiXactIdSingleMember() currently asserts that the offset is
> never zero, but it should try to do something sensible in that case
> instead of just failing.
>
> Correct me if I'm wrong, but we added the assertion that offsets are
never 0, based on the idea that case #2 will never take place during an
update. If this isn't the case, this assertion could be removed.
The rest of the function appears to work correctly.
I even think that, as an experiment, we could randomly reset some of the
offsets to zero and nothing would happen, except that some data would
be lost.
The most sensible thing we can do is give the user a warning, right?
Something like, "During the update, we encountered some weird offset
that shouldn't have been there, but there's nothing we can do about it,
just take note."
--
Best regards,
Maxim Orlov.
view thread (79+ 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], [email protected], [email protected]
Subject: Re: POC: make mxidoff 64 bits
In-Reply-To: <CACG=ezY0=ri8A0duXbpd1XNUc1jnngaPnmB0-+UZpxAv7-fNtw@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