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  1. ZooKeeper
  2. ZOOKEEPER-4508

ZooKeeper client run to endless loop in ClientCnxn.SendThread.run if all server down

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      The observable behavior is that client will not get expired event from watcher. The cause if twofold:
      1. `updateLastSendAndHeard` is called in reconnection so the session timeout don't decrease.
      2. There is not break out from `ClientCnxn.SendThread.run` after session timeout.

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            kezhuw Kezhu Wang
            kezhuw Kezhu Wang
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