我在ubuntu 12.04 lts中部署了hadoop 2.2.0，如下所示：http://codesfusion.blogspot.com/2013/10/setup-hadoop-2x-220-on-ubuntu.html?m=1
一切正常，除了在最后一步尝试运行hadoop示例时，暂停消息作业运行

13/11/24 23:36:30 INFO Configuration.deprecation: mapred.output.key.class is deprecated. Instead, use mapreduce.job.output.key.class
13/11/24 23:36:30 INFO Configuration.deprecation: mapred.working.dir is deprecated. Instead, use mapreduce.job.working.dir
13/11/24 23:36:31 INFO mapreduce.JobSubmitter: Submitting tokens for job: job_1385310900376_0001
13/11/24 23:36:32 INFO impl.YarnClientImpl: Submitted application application_1385310900376_0001 to ResourceManager at master/192.168.56.1:8040
13/11/24 23:36:32 INFO mapreduce.Job: The url to track the job: http://master:8088/proxy/application_1385310900376_0001/
13/11/24 23:36:32 INFO mapreduce.Job: Running job: job_1385310900376_0001

在resourcemanager web gui中，我看到“app is pending”。那么，我怎样才能变为运行状态呢？
截图：http://farm8.staticflickr.com/7344/11031415055_d987e937aa_o.png
谢谢！：）