I thought BTrees have conflict resolution code.

We have here a weird conflict here, the BTree in question is a SessionDataContainer. The conflict seems to appear when one transaction removes and the other adds an entry.

/ZODB/Connection.py", line 566, in commit
File "/home/zope/eggs/ZODB3-3.9.7-py2.6-linux-x86_64.egg/ZODB/Connection.py", line 614, in _commit
    self._store_objects(ObjectWriter(obj), transaction)
File "/home/zope/eggs/ZODB3-3.9.7-py2.6-linux-x86_64.egg/ZODB/Connection.py", line 666, in _store_objects
    s = self._storage.store(oid, serial, p, '', transaction)
File "/home/zope/eggs/ZODB3-3.9.7-py2.6-linux-x86_64.egg/ZODB/FileStorage/FileStorage.py", line 512, in store
ConflictError: database conflict error (oid 0x18, class BTrees.OOBTree.OOBTree, serial this txn started with 0x0392bbce8f0f9c11 2011-11-29 13:02:33.529916, serial currently committed 0x0392bbd10869d9bb 2011-11-29 13:05:01.971909)

Best regards,
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