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

From Thadeus Anand
Subject Re: [CAUTION: SUSPECT SENDER] RE: [CAUTION: SUSPECT SENDER] RE: BUG #19029: Replication Slot size keeps increasing while logical subscription works fine
Date
Msg-id CANUywMFzW=M4OC++awgN-n=-9yk8z5pM=1XV+1QxThpGwiuXvw@mail.gmail.com
Whole thread Raw
In response to RE: [CAUTION: SUSPECT SENDER] RE: BUG #19029: Replication Slot size keeps increasing while logical subscription works fine  ("Hayato Kuroda (Fujitsu)" <kuroda.hayato@fujitsu.com>)
Responses Re: [CAUTION: SUSPECT SENDER] RE: [CAUTION: SUSPECT SENDER] RE: BUG #19029: Replication Slot size keeps increasing while logical subscription works fine
List pgsql-bugs
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.hayato@fujitsu.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

pgsql-bugs by date:

Previous
From: "Hayato Kuroda (Fujitsu)"
Date:
Subject: RE: [CAUTION: SUSPECT SENDER] RE: BUG #19029: Replication Slot size keeps increasing while logical subscription works fine
Next
From: vignesh C
Date:
Subject: Re: BUG #19029: Replication Slot size keeps increasing while logical subscription works fine