Idle cluster increasingly consumes CPU resources

                 Key: ZOOKEEPER-883
             Project: Zookeeper
          Issue Type: Bug
          Components: server
            Reporter: Lars George

Monitoring the ZooKeeper nodes by polling the various ports using Nagios' open 
port checks seems to cause a substantial raise of CPU being used by the 
ZooKeeper daemons. Over the course of a week an idle cluster grew from a 
baseline 2% to >10% CPU usage. Attached is a stack dump and logs showing the 
occupied threads. At the end the daemon starts failing on "too many open files" 
errors as all handles are used up.

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