Gopal V created HIVE-20854:

             Summary: Sensible Defaults: Hive's Zookeeper heartbeat interval is 
20 minutes, change to 2
                 Key: HIVE-20854
             Project: Hive
          Issue Type: Bug
            Reporter: Gopal V

        new TimeValidator(TimeUnit.MILLISECONDS),
        "ZooKeeper client's session timeout (in milliseconds). The client is 
disconnected, and as a result, all locks released, \n" +
        "if a heartbeat is not sent in the timeout."),

That's 1,200,000ms which is too long for all practical purposes - a 20 minute 
outage in case a node has a failure is too long.

That is too long for the JDBC load-balancing, LLAP failure tolerance and the 
lock manager expiry.

Change to 2 minutes, as a sensible default

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