title: mapreduce.map.java.opts.max.heap and mapreduce.reduce.java.opts.max.heap properties in Cloudera Manager
body: <p>I have set up a new cluster using Cloudera Manager 5.5.1 , these  2 properties named <code>mapreduce.map.java.opts.max.heap</code> and <code>mapreduce.reduce.java.opts.max.heap</code> seem ambiguous with the other two properties <code>mapreduce.map.java.opts</code> and <code>mapreduce.reduce.java.opts</code>.</p>
  
  <p>Should I use the former or the latter set of properties  ? </p>