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In-Reply-To: <e122a2f0a0411056585f4b6beb053756a715705b.camel@cybertec.at>
From: kasem adel <kasemadel8@gmail.com>
Date: Tue, 7 Jan 2025 01:59:10 +0200
Message-ID: 
 <CAP-pBm-Y=b6YxHPag0TLertO=7OCo1kN8RVjBg5mvJNx6Y56KA@mail.gmail.com>
Subject: Re: Advice Needed: Simultaneous Upgrade of Two-Node PostgreSQL 11
 Cluster
To: Laurenz Albe <laurenz.albe@cybertec.at>
Cc: pgsql-admin@postgresql.org
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Dear Laurenz Albe

Our application for reporting  is  dependent on the replica node for
handling read-only operations. If we proceed with the proposed changes, it
would result in a one-month application downtime, which would significantly
impact our operations and is not a feasible option for us.

We would greatly appreciate your insights and support in identifying
alternative solutions to minimize down time (one month)or another solution
alternative for rebuild replica from scratch. Your expertise and advice
would be invaluable in helping us navigate this challenge effectively.

Thank you for your time and assistance.

=D9=81=D9=8A =D8=A7=D9=84=D8=A7=D8=AB=D9=86=D9=8A=D9=86=D8=8C =D9=A6 =D9=8A=
=D9=86=D8=A7=D9=8A=D8=B1 =D9=A2=D9=A0=D9=A2=D9=A5 =D9=A7:=D9=A1=D9=A3 =D9=
=85 Laurenz Albe <laurenz.albe@cybertec.at> =D9=83=D8=AA=D8=A8:

> On Sun, 2025-01-05 at 19:57 +0200, kasem adel wrote:
> > Proposed Upgrade Approach:
> >
> > Simultaneous Upgrade Process:
> >
> > Install new PostgreSQL version packages on both nodes
> > Run pg_upgrade with --check flag on both nodes
> > Execute pg_upgrade with --link option on both nodes simultaneously
> > Update Patroni configuration for new version on both nodes
>
> No, that won't work.
>
> You have to upgrade the primary, then rebuild the standby with
> "patronictl reinit".  There is no safe way to upgrade the standby.
>
> Yours,
> Laurenz Albe
>

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<div dir=3D"auto">Dear=C2=A0Laurenz Albe<div dir=3D"auto"><p>Our applicatio=
n for reporting=C2=A0 is=C2=A0 dependent on the replica node for handling r=
ead-only operations. If we proceed with the proposed changes, it would resu=
lt in a one-month application downtime, which would significantly impact ou=
r operations and is not a feasible option for us.</p><p>We would greatly ap=
preciate your insights and support in identifying alternative solutions to =
minimize down time (one month)or another solution alternative for rebuild r=
eplica from scratch. Your expertise and advice would be invaluable in helpi=
ng us navigate this challenge effectively.</p><p>Thank you for your time an=
d assistance.</p></div></div><br><div class=3D"gmail_quote gmail_quote_cont=
ainer"><div dir=3D"ltr" class=3D"gmail_attr">=D9=81=D9=8A =D8=A7=D9=84=D8=
=A7=D8=AB=D9=86=D9=8A=D9=86=D8=8C =D9=A6 =D9=8A=D9=86=D8=A7=D9=8A=D8=B1 =D9=
=A2=D9=A0=D9=A2=D9=A5 =D9=A7:=D9=A1=D9=A3 =D9=85 Laurenz Albe &lt;<a href=
=3D"mailto:laurenz.albe@cybertec.at">laurenz.albe@cybertec.at</a>&gt; =D9=
=83=D8=AA=D8=A8:<br></div><blockquote class=3D"gmail_quote" style=3D"margin=
:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">On Sun, 2025-01-05=
 at 19:57 +0200, kasem adel wrote:<br>
&gt; Proposed Upgrade Approach:<br>
&gt; <br>
&gt; Simultaneous Upgrade Process:<br>
&gt; <br>
&gt; Install new PostgreSQL version packages on both nodes<br>
&gt; Run pg_upgrade with --check flag on both nodes<br>
&gt; Execute pg_upgrade with --link option on both nodes simultaneously<br>
&gt; Update Patroni configuration for new version on both nodes<br>
<br>
No, that won&#39;t work.<br>
<br>
You have to upgrade the primary, then rebuild the standby with<br>
&quot;patronictl reinit&quot;.=C2=A0 There is no safe way to upgrade the st=
andby.<br>
<br>
Yours,<br>
Laurenz Albe<br>
</blockquote></div>

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