Re: [CAUTION: SUSPECT SENDER] RE: [CAUTION: SUSPECT SENDER] RE: BUG #19029: Replication Slot size keeps increasing while logical subscription works fine

Hi,

The logical_decoding_work_mem at the publisher is currently set at 1 GB.

I remember setting this a while ago as part of my struggle to get rid of
the memory allocation issue.

Thadeus Anand.

On Mon, 25 Aug, 2025, 3:19 pm Hayato Kuroda (Fujitsu), <
kuroda(dot)hayato(at)fujitsu(dot)com> wrote:

> Dear Thadeus,
>
> > Under the pg_replslot folder, each replication slot's folder increased
> > simultaneously. There were 12 folders (two publications, six
> subscribers), and
> > the total size increase was about 420 GB).
>
> Oh, I misunderstood like that number of WAL files increased.
>
> Let me do some more questions to diagnose your system.
> Can you share us the logical_decoding_work_mem on the publisher side? You
> can obtain via:
> ```
> SHOW logical_decoding_work_mem;
> ```
>
> Also, when you succeeded to reproduce, can you run the below command to
> see the
> conent of the directory? ${DATA_PUB} can be tuned based on your
> environment.
> ```
> du -sh ${DATA_PUB}/pg_replslot/*/*
> ```
> This can see for which file uses the disk so much.
>
> Best regards,
> Hayato Kuroda
> FUJITSU LIMITED
>
>