| From: | Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com> |
|---|---|
| To: | Thomas Munro <thomas(dot)munro(at)gmail(dot)com> |
| Cc: | pgsql-hackers <pgsql-hackers(at)postgresql(dot)org>, Thomas Munro <tmunro(at)postgresql(dot)org> |
| Subject: | Re: PANIC: could not fsync file "pg_multixact/..." since commit dee663f7843 |
| Date: | 2020-11-04 01:57:05 |
| Message-ID: | 20201104015705.yis7hroiixnbd4kv@development |
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| Lists: | pgsql-hackers |
On Wed, Nov 04, 2020 at 02:49:24PM +1300, Thomas Munro wrote:
>On Wed, Nov 4, 2020 at 2:32 PM Tomas Vondra
><tomas(dot)vondra(at)2ndquadrant(dot)com> wrote:
>> After a while (~1h on my machine) the pg_multixact gets over 10GB, which
>> triggers a more aggressive cleanup (per MultiXactMemberFreezeThreshold).
>> My guess is that this discards some of the files, but checkpointer is
>> not aware of that, or something like that. Not sure.
>
>Urgh. Thanks. Looks like perhaps the problem is that I have
>RegisterSyncRequest(&tag, SYNC_FORGET_REQUEST, true) in one codepath
>that unlinks files, but not another. Looking.
Maybe. I didn't have time to investigate this more deeply, and it takes
quite a bit of time to reproduce. I can try again with extra logging or
test some proposed fixes, if you give me a patch.
regards
--
Tomas Vondra http://www.2ndQuadrant.com
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
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