[Zope-dev] Re: [ZODB-Dev] Re: [Bug] ZODB invalidation processing

Andreas Jung lists at zopyx.com
Mon May 28 15:19:13 EDT 2007

--On 28. Mai 2007 21:12:13 +0200 Andreas Jung <lists at zopyx.com> wrote:

> --On 28. Mai 2007 20:03:47 +0200 Joachim Schmitz <js at aixtraware.de> wrote:
>> Joachim Schmitz schrieb:
>> ConflictError: database conflict error (oid 0x7fd771, class
>> BTrees._IOBTree.IOBucket, serial this txn started with 0x036deefe18489244
>> 2007-05-28 17:34:05.691441, serial currently committed 0x036def009207e011
>> 2007-05-28 17:36:34.225960)
>> ------
>> How can I find out, which objects are really involved in the conflict.
> from ZODB.utils import p64
> print app._p_jar[p64(some_oid)]
> The oid is available from the traceback. If you are running ZEO it might
> be necessary to replace 'app' with the top-level (or some other object)
> of the related storage (might be tricky to figure out if you have
> multiple storages).

Another trick that helped me lately to identify the reason for conflict 
errors was to implement the _p_resolveConflict() hook as method of the 
related class having the conflict.

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