我在horton沙盒中运行hadoop程序（wordcount）。情况如下。特别是，这个程序我已经在我使用的同一台虚拟机上成功运行了很多次，但是这次它“失败”了，没有任何通知，所以它就停留在那里了。我试过其他的mapreduce程序，结果都差不多。通常，命令行会通知我 ubermode : false ，后跟 Running job... ，但这次，它没有，而且没有理由。

[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

这个节目再也不能继续了。