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Re: Short writes

From: tomas(at)tuxteam(dot)de
To: Martijn van Oosterhout <kleptog(at)svana(dot)org>
Cc: Peter Eisentraut <peter_e(at)gmx(dot)net>, pgsql-hackers(at)postgresql(dot)org
Subject: Re: Short writes
Date: 2006-11-29 09:55:41
Message-ID: 20061129095541.GC23039@www.trapp.net (view raw or flat)
Thread:
Lists: pgsql-hackers
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On Tue, Nov 28, 2006 at 05:05:02PM +0100, Martijn van Oosterhout wrote:
> On Tue, Nov 28, 2006 at 04:51:35PM +0100, Peter Eisentraut wrote:
> > We are currently debugging a problem with error messages like this:
> > 
> > ERROR:  53100: could not write block 2427137 of relation 
> > 1663/706306048/706314280: No space left on device
[...]
> It would be interesting to know what other causes there could be for
> short writes.

Interrupted system call?

[Diclaimer: I assume provisions for that are taken, I just don't know
the code around that spot and am just offering an answer to the above
question]

The problem arises from the fact that errno is only guaranteed to be set
on a -1 return value. It'd be nice to have errno set on a short write
too.

So the "right" answer might be to retry a write on a short write and only
to bail out in the <=0 case (raising an "unspecified error" in the 0
case). Ugh.

Regards
- -- tomás
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