Map and Reduce task memory settings in Hadoop YARN
<p>Does the max memory for Reduce task need to more than the Map task in a MapReduce application on YARN? Like below...</p>

<pre><code>mapreduce.map.memory.mb = 7
mapreduce.reduce.memory.mb = 14
mapreduce.map.java.opts = 0.8 * 7 = 5,6
mapreduce.reduce.java.opts = 0.8 * 2 * 7 = 11,2
</code></pre>