| From: | Michael Paquier <michael(at)paquier(dot)xyz> |
|---|---|
| To: | Bharath Rupireddy <bharath(dot)rupireddyforpostgres(at)gmail(dot)com> |
| Cc: | Nathan Bossart <nathandbossart(at)gmail(dot)com>, Cary Huang <cary(dot)huang(at)highgo(dot)ca>, PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org> |
| Subject: | Re: add checkpoint stats of snapshot and mapping files of pg_logical dir |
| Date: | 2022-03-15 02:04:26 |
| Message-ID: | Yi/0KilcGi885sfJ@paquier.xyz |
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| Lists: | pgsql-hackers |
On Mon, Mar 14, 2022 at 03:54:19PM +0530, Bharath Rupireddy wrote:
> At times, the snapshot or mapping files can be large in number and one
> some platforms it takes time for checkpoint to process all of them.
> Having the stats about them in server logs can help us better analyze
> why checkpoint took a long time and provide a better RCA.
Do you have any numbers to share regarding that? Seeing information
about 1k WAL segments being recycled and/or removed by a checkpoint
where the operation takes dozens of seconds to complete because we can
talk about hundred of gigs worth of files moved around. If we are
talking about 100~200 files up to 10~20kB each for snapshot and
mapping files, the information has less value, worth only a portion of
one WAL segment.
--
Michael
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