Dieter Maurer wrote:
Willadsens wrote at 2005-4-1 15:13 -0500:
Here is (1) the original trace, failing on the commit:

Traceback (most recent call last):
File "/usr/local/lib/python2.4/site-packages/ZODB/", line
610, in commit
  raise ConflictError(object=obj)
ZODB.POSException.ConflictError: database conflict error (oid 0x00,
class persistent.mapping.PersistentMapping)

Apparently, two concurrent transactions try to modify the
root object.

Correct, and very intentional. The current question is: semaphore or trap error and retry? Chris suggested a retry, and said the semaphore is not necessary.

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