title: Hadoop program stuck at "Running job:"
body: <p>I was running hadoop program (wordcount) in Horton sandbox. And the situation occurred as below. Especially, this is the program I had ran successfully for many times on exactly the same virtual machine I used, however this time it "failed" without any notification, so it just stuck there. I tried other mapreduce program, the results are similar. Normally, the command lines will notify me with <code>ubermode : false</code>, follows by the <code>Running job...</code>, but this time, it doesn't, and out of no reason.</p>
  
  <pre><code>[root@sandbox ~]# hadoop jar testWC.jar testWC.WCdriver /data/input/pg103.txt /data/output/WC
  WARNING: Use "yarn jar" to launch YARN applications.
  16/03/11 19:20:01 INFO impl.TimelineClientImpl: Timeline service address: http://sandbox.hortonworks.com:8188/ws/v1/timeline/
  16/03/11 19:20:01 INFO client.RMProxy: Connecting to ResourceManager at sandbox.hortonworks.com/10.0.2.15:8050
  16/03/11 19:20:01 WARN mapreduce.JobResourceUploader: Hadoop command-line option parsing not performed. Implement the Tool interface and execute your application with ToolRunner to remedy this.
  16/03/11 19:20:02 INFO input.FileInputFormat: Total input paths to process : 1
  16/03/11 19:20:02 INFO mapreduce.JobSubmitter: number of splits:1
  16/03/11 19:20:02 INFO mapreduce.JobSubmitter: Submitting tokens for job: job_1457723341319_0002
  16/03/11 19:20:03 INFO impl.YarnClientImpl: Submitted application application_1457723341319_0002
  16/03/11 19:20:03 INFO mapreduce.Job: The url to track the job: http://sandbox.hortonworks.com:8088/proxy/application_1457723341319_0002/
  16/03/11 19:20:03 INFO mapreduce.Job: Running job: job_1457723341319_0002
  </code></pre>
  
  <p>The program just could not move on anymore.</p>