Prohibit copying ClientSession objects

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    • Type: Bug
    • Resolution: Fixed
    • Priority: Major - P3
    • 4.0
    • Affects Version/s: None
    • Component/s: None
    • Minor Change
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      It should not be possible to copy a ClientSession. A ClientSession maintains transaction state which cannot be duplicated. Also when a ClientSession is copied, the underlying server session is also duplicated, eventually resulting in duplicate _ServerSession objects in the pool:

      >>> import copy
>>> s = client.start_session()
>>> s._server_session
<pymongo.client_session._ServerSession object at 0x10408b438>
>>> s2 = copy.copy(s)
>>> s._server_session
<pymongo.client_session._ServerSession object at 0x10408b438>
>>> s2._server_session
<pymongo.client_session._ServerSession object at 0x10408b438>
>>> client._topology._session_pool
deque([])
>>> s.end_session()
>>> s2.end_session()
>>> client._topology._session_pool
deque([<pymongo.client_session._ServerSession object at 0x10408b438>, <pymongo.client_session._ServerSession object at 0x10408b438>])

            Assignee:
            Julius Park (Inactive)
            Reporter:
            Shane Harvey
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              Created:
              Updated:
              Resolved: