zookeeper client should throttle if its not able to connect to any of the 

                 Key: ZOOKEEPER-522
                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-522
             Project: Zookeeper
          Issue Type: Improvement
    Affects Versions: 3.2.0
            Reporter: Mahadev konar
             Fix For: 3.3.0

Currently the zookeeper client library keeps connecting to servers if all of 
them are unreachable. It will go through the list time and again and try to 
connect. Sometimes, this might cause problems like too many clients retrying 
connect to servers (and there might be something wrong/delay with servers) 
wherein the clients will give up and will try reconnecting to other servers. 
This causes a huge churn in client connections sometimes leading to the 
zookeeper server running out of file handles.

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