开启hadoop的start-all.sh脚本后，执行例子，出现properties could only be replicated to 0 nodes, instead of 1 这样的异常，解决方案是：
1、停止hadoop脚本：bin/stop-all.sh
(在进行2、3步前，注意数据的备份)
2、删除主节点和从节点上的hadoop根目录下的临时文件夹，比如$HADOOP_HOME/hadooptmp
3、格式化namenode: hadoop namenode -format
4、重新开启hadoop的start-all.sh脚本：bin/start-all.sh
5、查看从节点下的datanode是否起来，没有的话重复2、3
6、执行想要的jar包
正常会出现：
INFO input.FileInputFormat: Total input paths to process : 2
INFO util.NativeCodeLoader: Loaded the native-hadoop library
INFO mapred.JobClient: Running job: job_201303111150_0001
INFO mapred.JobClient: map 0% reduce 0%
INFO mapred.JobClient: map 100% reduce 0%
INFO mapred.JobClient: map 100% reduce 100%
INFO mapred.JobClient: Job complete: job_201303111150_0001
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