Horton

Re: Postmaster holding unlinked files for pg_largeobject table

Alvaro Herrera <alvherre@commandprompt.com>

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From: Alvaro Herrera <alvherre@commandprompt.com>
To: Kevin Grittner <kevin.grittner@wicourts.gov>
Cc: Tom Lane <tgl@sss.pgh.pa.us>, alexk <alexk@commandprompt.com>, Alexander Shulgin <ash@commandprompt.com>, pgsql-hackers <pgsql-hackers@postgresql.org>
Date: 2011-06-06T16:04:51Z
Lists: pgsql-hackers

Commits

Same data as JSON: GET /api/v1/messages/:b64id/commits the thread's linked commits as JSON, with link sources. API reference →

  1. Reset reindex-in-progress state before reverifying an exclusion constraint.

Excerpts from Kevin Grittner's message of lun jun 06 11:58:51 -0400 2011:
> Alvaro Herrera <alvherre@commandprompt.com> wrote:
>  
> > What we found out after more careful investigation is that the
> > file is kept open by a backend connected to a different database. 
> > I have a suspicion that what happened here is that this backend
> > was forced to flush out a page from shared buffers to read some
> > other page; and it was forced to do a fsync of this file.  And
> > then it forgets to close the file descriptor.
>  
> This sounds vaguely similar to what I found with WAL files being
> held open for days after they were deleted by read-only backends:
>  
> http://archives.postgresql.org/message-id/15412.1259630304@sss.pgh.pa.us
>  
> I mention it only because there might be one place to fix both....

Hmm interesting.  I don't think the placement suggested by Tom would be
useful, because the Zabbix backends are particularly busy all the time,
so they wouldn't run ProcessCatchupEvent at all.


-- 
Álvaro Herrera <alvherre@commandprompt.com>
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