high cpu utilization caused by nioserver factory thread

                 Key: ZOOKEEPER-287
                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-287
             Project: Zookeeper
          Issue Type: Bug
          Components: server
    Affects Versions: 3.0.1
         Environment: Linux 2.6.9-67.ELsmp #1 SMP Wed Nov 7 13:58:04 EST 2007 
i686 i686 i386 GNU/Linux
the servers were running in vmware vms
java version "1.6.0_06"
Java(TM) SE Runtime Environment (build 1.6.0_06-b02)
Java HotSpot(TM) Client VM (build 10.0-b22, mixed mode)

            Reporter: Patrick Hunt
            Priority: Critical

a user reported that a long running server, part of a 2 server ensemble, 
started using 100%cpu (1 server of the ensemble, the other was fine).

mahadev tracked it down to a thread in the server running epoll in a tight loop 
- the thread was the nio server factory thread that selects on client fds.

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