[Zope3-Users] ZODB database conflict error

Gregor Giesen grgi at fa.uni-tuebingen.de
Tue Jun 24 04:45:48 EDT 2008

Dear Andreas,

thank your for your response.

> > under heavy load of my zope application I got the following error:
> >
> >   WARNING ZopePublication Competing writes/reads at ... database
> > conflict error (oid 0x03a272, class BTrees.OIBTree.OIBucket, serial this
> > txn started with 0x0376b0db577575cc 2008-06-24 06:51:20.498163, serial
> > currently committed 0x0376b0dc374f1244 2008-06-24 06:52:12.963017)
> >
> > This is due to many reads and writes (adding objects) to a BTreeFolder.
> > So my questions are:
> > 1. How can I increase the number of retries to resolve the conflict?
I think this might be a quick workaround for my production instance.

> > 2. I think this might be a design problem of my application; should I
> > use another backend for storing such data (sql, etc.)?

> How about application specific conflict resolution (_p_resolveConflict() 
> hook)? How about using a nested folder structure in order to reduce the 
> number of conflicts?
I thought about _p_resolveConflict, but I don't see how to catch up this
conflict on my BTreeFolder derived class. Maybe I should give up the
BTrees and use an ordinary container implementation?

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