zkpython leading to segfault on zookeeper server restart

                 Key: ZOOKEEPER-670
                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-670
             Project: Zookeeper
          Issue Type: Bug
          Components: contrib-bindings
    Affects Versions: 3.2.2, 3.2.1
         Environment: CentOS w/ Python 2.4
            Reporter: Lei Zhang

Zookeeper client using zkpython segfaults on zookeeper server restart. It is 
reliably reproducible using the attached script zk.py.
I'm able to stop segfault using the attached patch voyager.patch, but zkpython 
seems to have deeper issue on its use of watcher_dispatch - on zookeeper server 
restart, I see up to 6 invocation of watcher_dispatch while my script is simply 
sleeping in the main thread. This can't be right.

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