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From: Etsuro Fujita <etsuro.fujita@gmail.com>
Date: Sun, 4 May 2025 21:30:42 +0900
Message-ID: 
 <CAPmGK14Zn9NwKPPmBrUyN9ALBJa2nv75-LOVKNBgRN=ehYnKkw@mail.gmail.com>
Subject: 
 =?UTF-8?Q?Re=3A_Options_to_control_remote_transactions=E2=80=99_access?=
	=?UTF-8?Q?=2Fdeferrable_modes_in_postgres=5Ffdw?=
To: Ashutosh Bapat <ashutosh.bapat.oss@gmail.com>
Cc: Tom Lane <tgl@sss.pgh.pa.us>,
	PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>
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--000000000000f3e73106344e8d77
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On Sun, Mar 30, 2025 at 7:14=E2=80=AFPM Etsuro Fujita <etsuro.fujita@gmail.=
com> wrote:
> On Thu, Mar 27, 2025 at 1:25=E2=80=AFPM Ashutosh Bapat
> <ashutosh.bapat.oss@gmail.com> wrote:
> > On Tue, Mar 25, 2025 at 4:01=E2=80=AFPM Etsuro Fujita <etsuro.fujita@gm=
ail.com> wrote:
> > > In the patch I also fixed a bug; I trusted XactReadOnly to see if the
> > > local transaction is READ ONLY, but I noticed that that is not 100%
> > > correct, because a transaction which started as READ WRITE can show a=
s
> > > READ ONLY later within subtransactions, so I modified the patch so
> > > that postgres_fdw opens remote transactions in READ ONLY mode if the
> > > local transaction has been declared READ ONLY at the top level.
> >
> > Nice catch. postgres_fdw replicates the transaction stack on foreign
> > server. I think we need to replicate it along with the transaction
> > properties. And also we need a test which tests readonly
> > subtransaction behaviour.
>
> Ok, will do.

I noticed that we don=E2=80=99t need to replicate it.  As read-only
subtransactions can=E2=80=99t change to read-write, and a read-only
main-transaction can=E2=80=99t change to read-write after first snapshot,
either (note: begin_remote_xact is called after it), all we need to do
is track the nesting level of the outermost read-only transaction in
the local transaction and control the access mode of remote
transactions based on it so that they have the same access mode as the
local transaction at each subtransaction level, like the attached.
This makes the patch pretty simple.  I added the tests in the patch.

What do you think about that?

Best regards,
Etsuro Fujita

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