我在Horton沙箱中运行hadoop程序（wordcount）。情况如下。特别是，这是我在我使用的完全相同的虚拟机上多次成功运行的程序，但是这次它“失败”而没有任何通知，所以它只是停留在那里。我试过其他mapreduce程序，结果都差不多。通常情况下，命令行会通过ubermode : false通知我，然后是Running job...，但这次，它没有，并且没有任何理由。
[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
该计划再也无法继续前进了。