hadoop-env.sh needs finer granularity
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                 Key: HADOOP-2551
                 URL: https://issues.apache.org/jira/browse/HADOOP-2551
             Project: Hadoop
          Issue Type: Improvement
            Reporter: Allen Wittenauer
            Priority: Minor


We often configure our HADOOP_OPTS on the name node to have JMX running so that 
we can do JVM monitoring.  But doing so means that we need to edit this file if 
we want to run other hadoop commands, such as fsck.  It would be useful if 
hadoop-env.sh was refactored a bit so that there were different and/or 
cascading HADOOP_OPTS dependent upon which process/task was being performed.  

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