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Re: Frequent database corruption

From: Michel Jouvin <jouvin_at_lal.in2p3.fr>
Date: 2005-02-21 16:05:58 CET

Trying to think about circumstances when corruptions occur, I have the
feeling that the problem affects only repositories access by svn clients
and WebSVN (which is a client too !). Could it make sense ?

Michel

--On dimanche 20 février 2005 11:56 +0100 Michel Jouvin
<jouvin@lal.in2p3.fr> wrote:

>
>
> --On samedi 19 février 2005 16:23 -0500 Mark Benedetto King
> <mbk@lowlatency.com> wrote:
>
>> On Sat, Feb 19, 2005 at 08:06:23PM +0100, Michel Jouvin wrote:
>>> >
>>> >>> Now we experienced corruptions not related to any repository write.
>>> >>> We have log files showing successful repository access through HTTP
>>> >>> GET followed by a GET failure due to database corruption without any
>>> >>> repository modification in between and without any Apache
>>> >>> problem/restart. We suspected that these corruption were related to
>>> >>> Apache restart during a transaction but we now have evidence that
>>> >>> corruption can occur at any time without any repository
>>> >>> modification. We have Apache log files and corrupted repository
>>> >>> copies.
>>> >
>>> > Is this with two httpd nodes or one?
>>> >
>>> > Is the httpd being used for anything else (CGI, PHP, etc?), or is it
>>> > dedicated for mod_dav_svn use?
>>> >
>>>
>>> Subversion server is implemented through a virtual host that is handled
>>> by only one node running only one Apache instance (with threads
>>> worker). This server also handles requests for a lot of other Web apps,
>>> including CGI, PHP.
>>>
>>
>> I suspect, then, that one of these other web application is doing
>> something evil (like calling exit()).
>>
>> Could you try running mod_dav_svn on a dedicated Apache instance (no
>> other web applications) and see whether the problems go away?
>>
>> If that fixes it, and you have reasons why they need to seem like the
>> same instance, perhaps you could try using mod_proxy to integrate the
>> two.
>>
>> --ben
>>
>
> Setting up such a test config could be possible, except we don't have the
> time and hardware required right now. But I don't see any apps doing and
> exit() or something like that. It should imply an apache restart and
> there were no such restart (assessed by Apache logs).
>
> Michel
>
>
>
> *************************************************************
> * Michel Jouvin Email : jouvin@lal.in2p3.fr *
> * LAL / CNRS Tel : +33 1 64468932 *
> * B.P. 34 Fax : +33 1 69079404 *
> * 91898 Orsay Cedex *
> * France *
> *************************************************************
>

     *************************************************************
     * Michel Jouvin Email : jouvin@lal.in2p3.fr *
     * LAL / CNRS Tel : +33 1 64468932 *
     * B.P. 34 Fax : +33 1 69079404 *
     * 91898 Orsay Cedex *
     * France *
     *************************************************************

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Received on Mon Feb 21 16:07:25 2005

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