Re: Log a warning in pg_createsubscriber for max_slot_wal_keep_size

On Mon, Jan 6, 2025 at 7:59 AM Hayato Kuroda (Fujitsu)
<kuroda.hayato@fujitsu.com> wrote:
>
> Dear Shubham,
>
> Thanks for creating a patch. I have one comment about it.
>
> check_publisher() assumed that the SQL function `pg_catalog.current_setting('max_slot_wal_keep_size')`
> will return the numeric, but it just return the text representation. I.e., if the parameter is
> set to 10MB, the function returns like below:
>
> ```
> postgres=# SELECT * FROM pg_catalog.current_setting('max_slot_wal_keep_size');
>  current_setting
> -----------------
>  10MB
> (1 row)
> ```
>
> Your patch can work well because atoi() ignores the latter part of the string,
> e.g., "10MB" is converted to "10", but this is not clean. I suggest either of
> 1) accepting the value as the string, or 2) using an SQL function pg_size_bytes()
> to get max_slot_wal_keep_size.
>

I have fixed the given comment. The v7 version Patch attached at [1]
has the changes for the same.
[1] - https://www.postgresql.org/message-id/CAHv8Rj%2BSxmBgz-vw5f7meRzEh6pgp9YhAjL5BPzTpevu31rY7Q%40mail.gmail.com

Thanks and regards,
Shubham Khanna.