Re: [BUG]Update Toast data failure in logical replication

Robert Haas <robertmhaas@gmail.com>

From: Robert Haas <robertmhaas@gmail.com>

To: Andres Freund <andres@anarazel.de>

Cc: Amit Kapila <amit.kapila16@gmail.com>, Dilip Kumar <dilipbalaut@gmail.com>, Petr Jelinek <petr.jelinek@enterprisedb.com>, Peter Eisentraut <peter.eisentraut@enterprisedb.com>, Tomas Vondra <tomas.vondra@enterprisedb.com>, Alvaro Herrera <alvherre@alvh.no-ip.org>, Kuntal Ghosh <kuntalghosh.2007@gmail.com>, "tanghy.fnst@fujitsu.com" <tanghy.fnst@fujitsu.com>, pgsql-hackers <pgsql-hackers@postgresql.org>

Date: 2022-01-24T21:43:31Z

Lists: pgsql-hackers

Commits

Same data as JSON: GET /api/v1/messages/:b64id/commits the thread's linked commits as JSON, with link sources. API reference →

WAL log unchanged toasted replica identity key attributes.
- 5e01001ffb38 15.0 landed
- b5e060473273 10.21 landed
- 1cd5802ac69a 11.16 landed
- ce349cf176e2 12.11 landed
- caa231be97df 13.7 landed
- 04645bbcae72 14.3 landed
Add new wal_level, logical, sufficient for logical decoding.
- e55704d8b2fe 9.4.0 cited
Add the notion of REPLICA IDENTITY for a table.
- 07cacba983ef 9.4.0 cited

On Mon, Jan 24, 2022 at 4:42 PM Andres Freund <andres@anarazel.de> wrote:
> On 2022-01-24 16:31:08 -0500, Robert Haas wrote:
> > That seems consistent with what's been described on this thread so
> > far, but I still don't quite understand why the logic that reassembles
> > TOAST chunks doesn't solve it.
>
> There are no toast chunks to reassemble if the update didn't change the
> primary key. So this just hits the path we'd also hit for an unchanged toasted
> non-key column.

Oh. Hmm. That's bad.

-- 
Robert Haas
EDB: http://www.enterprisedb.com