Re: Logical replication 'ERROR: invalid memory alloc request size 1831213792' after upgrading to 15.13

On Mon, Jun 9, 2025 at 7:09 PM Hayato Kuroda (Fujitsu)
<kuroda.hayato@fujitsu.com> wrote:
>
> Dear Braulio,
>
> > Hi, I'm having the issue with PG 15.13. We tried adding more memory
> > (logical_decoding_work_mem) to 5 GB, but it still doesn't work, and the process
> > "replicate" stops with the following error:
> > "CDC Fetch Failed: An unexpected connection error occurred while attempting to
> > replicate data from the source. Make sure your connection profile settings are
> > correct. If the problem persists, contact Google Support."
> > "ERROR: Invalid memory allocation request, size 1674007328."
> > We have another environment with PG 15.12, and it works perfectly.
> > This case has have relation with
https://www.postgresql.org/message-id/CALDaNm2sGfKsZwm8rG132N_i0AvyxkYu8TL46kNcx7KwAUABxA%40mail.gmail.com
>
> Thanks for reporting. Yes, I also feel that you faced the same issue. Since the
> issue happens lower layer than the logical decoding, logical_decoding_work_mem
> can't work to avoid the ERROR. We are discussing how we fix.

And I pushed the fix for this issue[1].

Regards,

[1] https://git.postgresql.org/gitweb/?p=postgresql.git;a=commit;h=d87d07b7ad3b782cb74566cd771ecdb2823adf6a

--
Masahiko Sawada
Amazon Web Services: https://aws.amazon.com