我在ubuntu 14.04上使用Hadoop 2.6.0。 它是一个单一节点，即我的笔记本电脑。 我正在研究wordcount示例。一切似乎都很好，除了map-reduce任务永远不会结束。 这是日志
hadoop jar wc.jar WordCount /home/hduser/wc/input/ /home/hduser/wc/op1
17/06/20 13:23:25 INFO client.RMProxy: Connecting to ResourceManager at /0.0.0.0:8032
17/06/20 13:23:29 WARN mapreduce.JobSubmitter: Hadoop command-line option parsing not performed. Implement the Tool interface and execute your application with ToolRunner to remedy this.
17/06/20 13:23:29 WARN mapreduce.JobSubmitter: No job jar file set. User classes may not be found. See Job or Job#setJar(String).
17/06/20 13:23:30 INFO input.FileInputFormat: Total input paths to process : 2
17/06/20 13:23:34 INFO mapreduce.JobSubmitter: number of splits:2
17/06/20 13:23:36 INFO mapreduce.JobSubmitter: Submitting tokens for job: job_1497883090952_0004
17/06/20 13:23:37 INFO mapred.YARNRunner: Job jar is not present. Not adding any jar to the list of resources.
17/06/20 13:23:38 INFO impl.YarnClientImpl: Submitted application application_1497883090952_0004
17/06/20 13:23:39 INFO mapreduce.Job: The url to track the job: http://chaitannya-HP-2000-Notebook-PC:8088/proxy/application_1497883090952_0004/
17/06/20 13:23:39 INFO mapreduce.Job: Running job: job_1497883090952_0004
我检查了是否有任何待处理的工作，所以没有。
mapred job -list
17/06/20 13:28:57 INFO client.RMProxy: Connecting to ResourceManager at /0.0.0.0:8032
Total jobs:1
JobId State StartTime UserName Queue Priority UsedContainers RsvdContainers UsedMem RsvdMem NeededMem AM info
job_1497883090952_0004 PREP 1497945217680 hduser default NORMAL 0 0 0M 0M 0M
可能是什么问题。