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Thread: log wal file transfer in error logs

log wal file transfer in error logs

From
Atul Kumar
Date:
Hi,

I need to log all wal files that are getting transferred to all standby servers in the postgresql error logs.

I also need to log those wal files that are being applied in standbys.

My postgres version is 12 and running on centos 7.

I am unable to understand the proper parameters in the postgresql.conf file, please help me in achieving this.



Regards,
Atul

Re: log wal file transfer in error logs

From
Laurenz Albe
Date:
On Wed, 2023-10-11 at 22:15 +0530, Atul Kumar wrote:
> I need to log all wal files that are getting transferred to all standby servers in the postgresql error logs.

WAL files are not transferred to standby servers...

WAL is streamed, so what would you want to log?

Yours,
Laurenz Albe

Re: log wal file transfer in error logs

From
Atul Kumar
Date:
Yes, I meant streamed, I need to log those wal files that are getting streamed and replayed on standby servers in error logs of primary as well as standby servers.

So that I can cross check that whichever file is streamed has been replayed on standby.

I need to keep a track of these wal files in db error logs.



Regard

On Wed, Oct 11, 2023 at 10:29 PM Atul Kumar <akumar14871@gmail.com> wrote:
Yss, I meant streamed, I need to log those wal files that are getting streamed and replayed on standby servers in error logs of primary as well as standby servers.

So that I can cross check that whichever file is streamed has been replayed on standby.

I need to keep a track of these wal files in db error logs.



Regards,
Atul



On Wed, Oct 11, 2023 at 10:21 PM Laurenz Albe <laurenz.albe@cybertec.at> wrote:
On Wed, 2023-10-11 at 22:15 +0530, Atul Kumar wrote:
> I need to log all wal files that are getting transferred to all standby servers in the postgresql error logs.

WAL files are not transferred to standby servers...

WAL is streamed, so what would you want to log?

Yours,
Laurenz Albe

Re: log wal file transfer in error logs

From
Ron
Date:

Tables (on the primary) pg_stat_replication and (on the secondary) pg_stat_wal_receiver do that for you.

On 10/11/23 12:50, Atul Kumar wrote:
Yes, I meant streamed, I need to log those wal files that are getting streamed and replayed on standby servers in error logs of primary as well as standby servers.

So that I can cross check that whichever file is streamed has been replayed on standby.

I need to keep a track of these wal files in db error logs.



Regard

On Wed, Oct 11, 2023 at 10:29 PM Atul Kumar <akumar14871@gmail.com> wrote:
Yss, I meant streamed, I need to log those wal files that are getting streamed and replayed on standby servers in error logs of primary as well as standby servers.

So that I can cross check that whichever file is streamed has been replayed on standby.

I need to keep a track of these wal files in db error logs.



Regards,
Atul



On Wed, Oct 11, 2023 at 10:21 PM Laurenz Albe <laurenz.albe@cybertec.at> wrote:
On Wed, 2023-10-11 at 22:15 +0530, Atul Kumar wrote:
> I need to log all wal files that are getting transferred to all standby servers in the postgresql error logs.

WAL files are not transferred to standby servers...

WAL is streamed, so what would you want to log?

Yours,
Laurenz Albe

--
Born in Arizona, moved to Babylonia.

Re: log wal file transfer in error logs

From
Laurenz Albe
Date:
On Wed, 2023-10-11 at 23:20 +0530, Atul Kumar wrote:
> Yes, I meant streamed, I need to log those wal files that are getting streamed
> and replayed on standby servers in error logs of primary as well as standby servers.
>
> So that I can cross check that whichever file is streamed has been replayed on standby.
>
> I need to keep a track of these wal files in db error logs.

I don't think you can do that, and it seems like a strange requirement to me.

Instead, you should monitor pg_stat_replication.

Yours,
Laurenz Albe