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In-Reply-To: <f9f1b-65e72c80-7-533dda00@76203995>
From: Ajin Cherian <itsajin@gmail.com>
Date: Thu, 4 Apr 2024 16:23:15 +1100
Message-ID: <CAFPTHDbU4EkVmKL66i5BzrmQ6LFftQPx_TZ1euKt9fvVzQDyjA@mail.gmail.com>
Subject: Re: Slow catchup of 2PC (twophase) transactions on replica in LR
To: =?UTF-8?B?0JTQsNCy0YvQtNC+0LIg0JLQuNGC0LDQu9C40Lk=?= <v.davydov@postgrespro.ru>
Cc: Heikki Linnakangas <hlinnaka@iki.fi>, pgsql-hackers@lists.postgresql.org
Content-Type: multipart/mixed; boundary="000000000000008dca06153e8a57"
Archived-At: <https://www.postgresql.org/message-id/CAFPTHDbU4EkVmKL66i5BzrmQ6LFftQPx_TZ1euKt9fvVzQDyjA%40mail.gmail.com>
Precedence: bulk

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On Wed, Mar 6, 2024 at 1:29=E2=80=AFAM =D0=94=D0=B0=D0=B2=D1=8B=D0=B4=D0=BE=
=D0=B2 =D0=92=D0=B8=D1=82=D0=B0=D0=BB=D0=B8=D0=B9 <v.davydov@postgrespro.ru=
>
wrote:

> In usual work, the subscription has two_phase =3D on. I have to change th=
is
> option at catchup stage only, but this parameter can not be altered. Ther=
e
> was a patch proposal in past to implement altering of two_phase option, b=
ut
> it was rejected. I think, the recreation of the subscription with two_pha=
se
> =3D off will not work.
>
>
>
The altering of two_phase was restricted because if there was a previously
prepared transaction on the subscriber when the two_phase was on, and then
it was turned off, the apply worker on the subscriber would re-apply the
transaction a second time and this might result in an inconsistent replica.
Here's a patch that allows toggling two_phase option provided that there
are no pending uncommitted prepared transactions on the subscriber for that
subscription.

Thanks to Kuroda-san for working on the patch.

regards,
Ajin Cherian
Fujitsu Australia

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<div dir=3D"ltr"><div dir=3D"ltr"><br></div><br><div class=3D"gmail_quote">=
<div dir=3D"ltr" class=3D"gmail_attr">On Wed, Mar 6, 2024 at 1:29=E2=80=AFA=
M =D0=94=D0=B0=D0=B2=D1=8B=D0=B4=D0=BE=D0=B2 =D0=92=D0=B8=D1=82=D0=B0=D0=BB=
=D0=B8=D0=B9 &lt;<a href=3D"mailto:v.davydov@postgrespro.ru">v.davydov@post=
grespro.ru</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=
-left:1ex">In usual work, the subscription has two_phase =3D on. I have to =
change this option at catchup stage only, but this parameter can not be alt=
ered. There was a patch proposal in past to implement altering of two_phase=
 option, but it was rejected. I think, the recreation of the subscription w=
ith two_phase =3D off will not work.<br><br><br></blockquote><div><br></div=
><div>The altering of two_phase was restricted because if there was a previ=
ously prepared transaction on the subscriber when the two_phase was on, and=
 then it was turned off, the apply worker on the subscriber would re-apply =
the transaction a second time and this might result in an inconsistent repl=
ica.<br></div><div>Here&#39;s a patch that allows toggling two_phase option=
 provided that there are no pending uncommitted prepared transactions on th=
e subscriber for that subscription.</div><div><br></div><div>Thanks to Kuro=
da-san for working on the patch.</div><div><br></div><div>regards,</div><di=
v>Ajin Cherian</div><div>Fujitsu Australia<br></div></div></div>

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