Remove references of mapred.child.ulimit etc. since they are not being used any 
more
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                 Key: HADOOP-8288
                 URL: https://issues.apache.org/jira/browse/HADOOP-8288
             Project: Hadoop Common
          Issue Type: Bug
    Affects Versions: 0.23.2
            Reporter: Ravi Prakash
            Assignee: Ravi Prakash


Courtesy Philip Su, we found that (mapred.child.ulimit, mapreduce.map.ulimit, 
mapreduce.reduce.ulimit) were not being used at all. The configuration exists 
but is never used. Its also mentioned in mapred-default.xml and 
templates/../mapred-site.xml . Also the method getUlimitMemoryCommand in 
Shell.java is now useless and can be removed.

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