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In-Reply-To: <d29ac46d-4761-401c-b073-46884426c13a@iki.fi>
From: Maxim Orlov <orlovmg@gmail.com>
Date: Thu, 4 Dec 2025 18:33:47 +0300
Message-ID: 
 <CACG=eza-JrdrWqCu2zR05+jWPSHO2CO9hrHTYBNF9LSd4dzXGw@mail.gmail.com>
Subject: Re: POC: make mxidoff 64 bits
To: Heikki Linnakangas <hlinnaka@iki.fi>
Cc: Alvaro Herrera <alvherre@alvh.no-ip.org>,
 Alexander Korotkov <aekorotkov@gmail.com>,
	wenhui qiu <qiuwenhuifx@gmail.com>,
	Postgres hackers <pgsql-hackers@lists.postgresql.org>,
	Ashutosh Bapat <ashutosh.bapat.oss@gmail.com>
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Precedence: bulk

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On Thu, 4 Dec 2025 at 13:39, Heikki Linnakangas <hlinnaka@iki.fi> wrote:

> However, that doesn't hold for pg_upgrade. pg_upgrade will try to read
> all the multixids. So we need to make the multixact reading code
> tolerant of the situations that could be present after a crash. I think
> the right philosophy here is that we try to read all the old multixids,
> and do our best to interpret them the same way that the old server
> would.


Something like attached?

Now previous scheme of upgrade with the bytes joggling start
looking not so bad. Just a funny thought that came to my mind.

Perhaps we should check that all the files exist and have the correct

sizes in the pre-check stage


Not sure about it. Because SLRU does not support "holes", simply
checking if the first and last multixacts exist will be enough. But
we'll do it anyway in a real conversion.

PFA to start a conversation.

-- 
Best regards,
Maxim Orlov.

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<div dir=3D"ltr"><div dir=3D"ltr"></div><br><div class=3D"gmail_quote gmail=
_quote_container"><div dir=3D"ltr" class=3D"gmail_attr">On Thu, 4 Dec 2025 =
at 13:39, Heikki Linnakangas &lt;<a href=3D"mailto:hlinnaka@iki.fi">hlinnak=
a@iki.fi</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D=
"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-le=
ft:1ex">
However, that doesn&#39;t hold for pg_upgrade. pg_upgrade will try to read =
<br>
all the multixids. So we need to make the multixact reading code <br>
tolerant of the situations that could be present after a crash. I think <br=
>
the right philosophy here is that we try to read all the old multixids, <br=
>
and do our best to interpret them the same way that the old server <br>
would.=C2=A0=C2=A0</blockquote><div>=C2=A0</div><div>Something like attache=
d?</div><div><br></div><div>Now previous scheme of upgrade with the bytes j=
oggling start</div><div>looking not so bad. Just a funny thought that came =
to my mind.</div><div><br></div><blockquote class=3D"gmail_quote" style=3D"=
margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-lef=
t:1ex">Perhaps we should check that all the files exist and have the correc=
t=C2=A0</blockquote><blockquote class=3D"gmail_quote" style=3D"margin:0px 0=
px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">sizes=
 in the pre-check stage</blockquote><div><br></div><div>Not sure about it. =
Because SLRU does not support &quot;holes&quot;, simply</div><div>checking =
if the first and last multixacts exist will be enough. But</div><div>we&#39=
;ll do it anyway in a real conversion.</div><div><br></div><div>PFA to star=
t a conversation.</div><br></div><span class=3D"gmail_signature_prefix">-- =
</span><br><div dir=3D"ltr" class=3D"gmail_signature"><div dir=3D"ltr"><div=
>Best regards,<br></div><div>Maxim Orlov.</div></div></div></div>

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