title: RM job was stuck when running with oozie
body: <p>I'm running a mapreduce wordcount job task on oozie. 2 jobs were submitted to the yarn, and then the monitoring tasks running upto 99% were stuck. Wordcount job has been 0%.</p>
  
  <p>When I kill off the monitor job, wordcount job runs smoothly.</p>
  
  <p>I use a cluster of 3 virtual machines, configuration is as follows:</p>
  
  <pre><code> Profile per VM: cores=2 memory=2048MB reserved=0GB usableMem=0GB disks=1
   Num Container=3
   Container Ram=640MB
   Used Ram=1GB
   Unused Ram=0GB
   yarn.scheduler.minimum-allocation-mb=640
   yarn.scheduler.maximum-allocation-mb=1920
   yarn.nodemanager.resource.memory-mb=1920
   mapreduce.map.memory.mb=640
   mapreduce.map.java.opts=-Xmx512m
   mapreduce.reduce.memory.mb=1280
   mapreduce.reduce.java.opts=-Xmx1024m
   yarn.app.mapreduce.am.resource.mb=640
   yarn.app.mapreduce.am.command-opts=-Xmx512m
   mapreduce.task.io.sort.mb=256
  </code></pre>
  
  <p>Is there any way to solve this, to make two jobs run smoothly and finish at the same time ?</p>