[ZODB-Dev] Conflict Error

[David Otero Figueroa]

Hello Marco,

I have this problems too in a not estress testing. In a simple access (2
concurrents users) I have this response:

2008-05-27T13:23:48 INFO ZODB conflict error at /portal/ (22 conflicts since
startup at 2008-05-27T10:37:28)
2008-05-27T13:23:48 INFO ZODB conflict error at /portal/ (23 conflicts since
startup at 2008-05-27T10:37:28)
2008-05-27T13:29:21 INFO ZODB conflict error at
/portal/login_form_usuario_pwd/ (29 conflicts since startup at
2008-05-27T10:37:28)
2008-05-27T13:29:22 INFO ZODB conflict error at
/portal/login_form_usuario_pwd/ (30 conflicts since startup at
2008-05-27T10:37:28)
2008-05-27T19:48:40 INFO ZODB conflict error at /portal/portal_css/Plone
Default/ploneStyles5658.css (68 conflicts since startup at
2008-05-27T13:37:19)

How can they be solved?
Can I realize partial commits? How to?

Thanks in advance.
David



2008/6/5 Marco Bizzarri <marco.bizzarri at gmail.com>:

> Even though I'm not a ZODB guru, I would suggest investigating if your
> page is really a read-only one.
>
> I had a case with ab tool which I used as a stress tool. It openend a
> new session for each client and each request, thus potentially causing
> conflicts.
>
> Regards
> Marco
>
> On Thu, Jun 5, 2008 at 12:10 PM, David Otero Figueroa <doterof at gmail.com>
> wrote:
> >
> >
> > Hello everyone,
> >
> > I have a couple questions related to "conflict errors".
> >
> > During our home page stress testing (20 concurrent users), we detected
> > several conflict errors (see trace below), We thought these could ONLY
> > appear when writing objects in the ZODB.
> >
> > 2008-05-27T18:57:53 INFO ZODB conflict error at /portal/ (26 conflicts
> since
> > startup at 2008-05-27T13:37:19)
> >
> >
> > I would like to know:
> > - Can conflict errors appear when reading objects from the ZODB?
> > - Could conflict errors be the cause of a "spinning ZOPE" scenario?
> > - Is there any situation where ZOPE could try to write objects when
> > rendering an "only read" page?
> >
> > Our configuration is as follows: Apache + Pound + ZEO architecture (5 ZEO
> > clients, 1 ZEO storage server - 650.000 ZODB objects)
> >
> > Thanks in advance.
> >
> >
> > _______________________________________________
> > For more information about ZODB, see the ZODB Wiki:
> > http://www.zope.org/Wikis/ZODB/
> >
> > ZODB-Dev mailing list  -  ZODB-Dev at zope.org
> > http://mail.zope.org/mailman/listinfo/zodb-dev
> >
> >
>
>
>
> --
> Marco Bizzarri
> http://iliveinpisa.blogspot.com/
>
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