From: | Bruce Momjian <bruce(at)momjian(dot)us> |
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To: | Robert Haas <robertmhaas(at)gmail(dot)com> |
Cc: | "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: when the startup process doesn't |
Date: | 2021-04-20 00:30:19 |
Message-ID: | 20210420003019.GC30205@momjian.us |
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Lists: | pgsql-hackers |
On Mon, Apr 19, 2021 at 01:55:13PM -0400, Robert Haas wrote:
> I've noticed that customers not infrequently complain that they start
> postgres and then the system doesn't come up for a while and they have
> no idea what's going on and are (understandably) worried. There are
> probably a number of reasons why this can happen, but the ones that
> seem to come up most often in my experience are (1) SyncDataDirectory
> takes a long time, (b) ResetUnloggedRelations takes a long time, and
> (c) there's a lot of WAL to apply so that takes a long time. It's
> possible to distinguish this last case from the other two by looking
> at the output of 'ps', but that's not super-convenient if your normal
> method of access to the server is via libpq, and it only works if you
> are monitoring it as it's happening rather than looking at the logs
> after-the-fact. I am not sure there's any real way to distinguish the
> other two cases without using strace or gdb or similar.
>
> It seems to me that we could do better. One approach would be to try
> to issue a log message periodically - maybe once per minute, or some
> configurable interval, e.g. perhaps add messages something like this:
Yes, this certainly needs improvement.
--
Bruce Momjian <bruce(at)momjian(dot)us> https://momjian.us
EDB https://enterprisedb.com
If only the physical world exists, free will is an illusion.
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