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In-Reply-To: 
 <CAA4eK1KsF+v3v6wOoWDWzj3fb_1kDi9dpf+aHdjz=2-k_C3mrg@mail.gmail.com>
From: vignesh C <vignesh21@gmail.com>
Date: Wed, 24 Jun 2026 17:54:35 +0530
Message-ID: 
 <CALDaNm2GJYd6OBO9h=nTHuLt-Vg66nsGMv0GrvfX=S=nE3qqEg@mail.gmail.com>
Subject: Re: Proposal: Conflict log history table for Logical Replication
To: Amit Kapila <amit.kapila16@gmail.com>
Cc: Dilip Kumar <dilipbalaut@gmail.com>,
 Nisha Moond <nisha.moond412@gmail.com>,
	shveta malik <shveta.malik@gmail.com>, Peter Smith <smithpb2250@gmail.com>,
	Masahiko Sawada <sawada.mshk@gmail.com>,
	Bharath Rupireddy <bharath.rupireddyforpostgres@gmail.com>,
	PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
Archived-At: 
 <https://www.postgresql.org/message-id/CALDaNm2GJYd6OBO9h%3DnTHuLt-Vg66nsGMv0GrvfX%3DS%3DnE3qqEg%40mail.gmail.com>
Precedence: bulk

On Wed, 24 Jun 2026 at 16:32, Amit Kapila <amit.kapila16@gmail.com> wrote:
>
> On Wed, Jun 24, 2026 at 12:53=E2=80=AFPM Dilip Kumar <dilipbalaut@gmail.c=
om> wrote:
> >
> > On Tue, Jun 23, 2026 at 2:22=E2=80=AFPM vignesh C <vignesh21@gmail.com>=
 wrote:
> > >
> > > Few comments:
> > > 1) Currently we are storing these in shared memory. Looking at the
> > > implementation, these fields are purely worker-private state used to
> > > ferry data across the error boundary from prepare_conflict_log_tuple(=
)
> > > (inside the PG_TRY block) to ProcessPendingConflictLogTuple() (inside
> > > the PG_CATCH block).
>
> Good point.
>
> If it is not required by another process, should
> > > it be moved out of shared memory.
> > > +       /* A conflict log tuple that is prepared but not yet inserted=
. */
> > > +       HeapTuple       conflict_log_tuple;
> > > +
> > > +       /*
> > > +        * Error-context string describing the conflict above, used t=
o
> > > annotate any
> > > +        * error raised while inserting conflict_log_tuple into the c=
onflict log
> > > +        * table.  Allocated, like conflict_log_tuple, in ApplyContex=
t.
> > > +        */
> > > +       char       *conflict_log_errcontext;
> >
> > Yeah there is no need for them to be in shared memory, but do we have
> > any other data sturcture where these fits naturally, or we can make
> > them global variables?
> >
>
> Or we can have a file local struct PendingConflictLogData similar to
> FlushPosition. See the attached top-up patch. As the comment
> ("Allocated, like conflict_log_tuple, in ApplyContext") says it is
> allocated in process-local Apply context, it is not safe to keep them
> in shared memory.

These approach looks good, couple of minor comments can be done while
merging the patch:
1) Generally we keep the typedef name and struct name same:
+typedef struct PendingConflictLogData
+{
+       HeapTuple       tuple;                  /* prepared,
not-yet-inserted conflict tuple */
+       char       *errcontext_str;     /* conflict description for
error context */
+} PendingConflictLog;

2) PendingConflictLog should be included in typedefs.list

Regards,
Vignesh