RE: Non-superuser subscription owners

From: "Zhijie Hou (Fujitsu)" <houzj(dot)fnst(at)fujitsu(dot)com>
To: Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>
Cc: Robert Haas <robertmhaas(at)gmail(dot)com>, Andres Freund <andres(at)anarazel(dot)de>, Mark Dilger <mark(dot)dilger(at)enterprisedb(dot)com>, Andrew Dunstan <andrew(at)dunslane(dot)net>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>, Jeff Davis <pgsql(at)j-davis(dot)com>, Alexander Lakhin <exclusion(at)gmail(dot)com>
Subject: RE: Non-superuser subscription owners
Date: 2023-06-14 03:53:54
Message-ID: OS0PR01MB5716464C9FB1A90B33ABA4EA945AA@OS0PR01MB5716.jpnprd01.prod.outlook.com
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On Wednesday, June 14, 2023 10:11 AM Amit Kapila <amit(dot)kapila16(at)gmail(dot)com> wrote:
>
> On Tue, Jun 13, 2023 at 2:25 PM Amit Kapila <amit(dot)kapila16(at)gmail(dot)com> wrote:
> >
> > On Fri, May 12, 2023 at 3:28 PM Zhijie Hou (Fujitsu)
> > <houzj(dot)fnst(at)fujitsu(dot)com> wrote:
> > >
> > >
> > > I can reproduce this via gdb following similar steps in [1].
> > >
> > > I think we need to move this call into a transaction as well and
> > > here is an attempt to do that.
> > >
> >
> > I am able to reproduce this issue following the steps mentioned by you
> > and the proposed patch to fix the issue looks good to me.
> >
>
> Today, again looking at the patch, it seems to me that it would be better if we
> can fix this without starting a new transaction. Won't it be better if we move this
> syscall to a place where we are fetching relstate (GetSubscriptionRelState()) a
> few lines above? I understand by doing that in some cases like when copy_data
> = false, we may do this syscall unnecessarily but OTOH, starting a new
> transaction just for a syscall (superuser_arg()) also doesn't seem like a good
> idea to me.

Makes sense to me, here is the updated patch which does the same.

Best Regards,
Hou zj

Attachment Content-Type Size
v2-0001-Fix-possible-logical-replication-table-sync-crash.patch application/octet-stream 1.8 KB

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