新搭建了个集群，搭建完了，运行
hadoop jar /opt/hadoop-2.4.1/share/hadoop/mapreduce/hadoop-mapreduce-examples-2.4.1.jar pi 10 100hadoop jar /opt/hadoop-2.4
阅读背景：
Exception from container-launch: org.apache.hadoop.util.Shell$ExitCodeException
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