Free up the buffers (input and error) while executing a shell command before 
waiting for it to finish.
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                 Key: HADOOP-2344
                 URL: https://issues.apache.org/jira/browse/HADOOP-2344
             Project: Hadoop
          Issue Type: Bug
    Affects Versions: 0.15.2
            Reporter: Amar Kamat
             Fix For: 0.15.2


Process.waitFor() should be invoked after freeing up the input and error 
stream.  While fixing https://issues.apache.org/jira/browse/HADOOP-2231 we 
found that this might be a possible cause.

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