[Zope-dev] Re: many conflict errors

Laurence Rowe l at lrowe.co.uk
Tue May 29 13:27:57 EDT 2007

Perry wrote:
> Tres Seaver schrieb:
>> Hash: SHA1
>>> ------
>>> 2007-05-25T10:19:01 ERROR Zope.SiteErrorLog
>>> http://uniben.waeup.org/campus/students/C172676/study_course/create_level 
>>> Traceback (innermost last):
>>>    Module Zope2.App.startup, line 173, in zpublisher_exception_hook
>>>    Module ZPublisher.Publish, line 121, in publish
>>>    Module Zope2.App.startup, line 240, in commit
>>>    Module transaction._manager, line 96, in commit
>>>    Module Products.CPSCompat.PatchZODBTransaction, line 175, in commit
>>>    Module transaction._transaction, line 436, in _commitResources
>>>    Module ZODB.Connection, line 665, in tpc_vote
>>>    Module ZEO.ClientStorage, line 893, in tpc_vote
>>>    Module ZEO.ClientStorage, line 877, in _check_serials
>>> ConflictError: database conflict error (oid 0x7905e6, class
>>> BTrees._IOBTree.IOBucket, serial this txn started with
>>> 0x036ddc2b3e989fdd 2007-05-25 09:15:14.670982, serial currently
>>> committed 0x036ddc2dd48f4e33 2007-05-25 09:17:49.818700)
>> Neither of those tracebacks look like they come out of the 'faster'
>> session machinery itself;  it uses an 'OOBTree' by default for storing
>> the slices, not an 'IOBtree'.  The primary consumer of 'IOBTree' is
>> probably the catalog, where it is used to map RID -> values in the
>> 'unindex' of 'FieldIndex', etc.  The original sessioning machinery uses
>> 'IOBTree', too:  are you sure you are using the faster machnery?
> Yes, but I am not sure, or better I don't know who is causing these errors.

I wrote up some stuff on finding the path of an object 
http://plone.org/documentation/how-to/debug-zodb-bloat/ and 

The scripts need to be updated for recent ZODBs (change one import I think).


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