1、hadoop fs -ls不能查询，上图
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[shim@hadoop ~]$ hadoop fs -ls
ls: Cannot access .: No such file or directory.
[shim@hadoop ~]$ hadoop fs -ls /
Found 2 items
drwxr-xr-x - shim supergroup 0 2012-05-17 00:52 /home
drwxr-xr-x - shim supergroup 0 2012-05-17 00:53 /usr
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2、namenode、jobtasker没有启动，jps也没有显示namenode、datanode信息
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需要更改主机名才能启动本地hadoop服务
centos下永久修改主机名：$vim /etc/systemconfig/network
