Deadlock in class init.
-----------------------

                 Key: HADOOP-7964
                 URL: https://issues.apache.org/jira/browse/HADOOP-7964
             Project: Hadoop Common
          Issue Type: Bug
          Components: security, util
    Affects Versions: 1.0.0, 0.20.205.0, 0.24.0, 0.23.1, 1.1.0
            Reporter: Kihwal Lee
            Priority: Blocker


After HADOOP-7808, client-side commands hang occasionally. There are cyclic 
dependencies in NetUtils and SecurityUtil class initialization. Upon initial 
look at the stack trace, two threads deadlock when they hit the either of class 
init the same time.

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