| From: | "Drouvot, Bertrand" <bertranddrouvot(dot)pg(at)gmail(dot)com> |
|---|---|
| To: | sirisha chamarthi <sirichamarthi22(at)gmail(dot)com>, PostgreSQL Developers <pgsql-hackers(at)lists(dot)postgresql(dot)org> |
| Subject: | Re: Add ps display while waiting for wal in read_local_xlog_page_guts |
| Date: | 2023-04-13 06:02:48 |
| Message-ID: | 12ff7bac-4ba9-39e6-c95b-4c223e724295@gmail.com |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-hackers |
Hi,
On 4/13/23 12:43 AM, sirisha chamarthi wrote:
> Hi,
>
> pg_create_logical_replication_slot can take longer than usual on a standby when there is no activity on the primary. We don't have enough information in the pg_stat_activity or process title to debug why this is taking so long. Attached a small patch to update the process title while waiting for the wal in read_local_xlog_page_guts. Any thoughts on introducing a new wait event too?
>
> For example, in my setup, slot creation took 8 minutes 13 seconds. It only succeeded after I ran select txid_current() on primary.
FWIW, this behavior has been mentioned in 0fdab27ad6 and a new function (pg_log_standby_snapshot()) has been created/documented to accelerate the slot creation on the standby.
Regards,
--
Bertrand Drouvot
PostgreSQL Contributors Team
RDS Open Source Databases
Amazon Web Services: https://aws.amazon.com
| From | Date | Subject | |
|---|---|---|---|
| Next Message | Drouvot, Bertrand | 2023-04-13 06:05:27 | Re: Add ps display while waiting for wal in read_local_xlog_page_guts |
| Previous Message | Tom Lane | 2023-04-13 05:43:12 | Re: [PATCH] Add `verify-system` sslmode to use system CA pool for server cert |