Github user StephanEwen commented on the pull request:
https://github.com/apache/flink/pull/917#issuecomment-123723565
The `leaderSessionID` in the JobManager is constant. Can it not change over
time? An example would be when a JobManager looses the ZooKeeper connection
(network partition) and looses its leader status, but later comes back, and
regains leader status.
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