在hadoop2中查看网页中的/tmp目录出现下面的错误：
Permission denied: user=dr.who, access=READ_EXECUTE inode="/tmp"
修改权限就好了。。。。我原来一直纠结dr.who是什么鬼...不管他修改hdfs的权限就好了。
$HADOOP_HOME/bin/hdfs dfs -chmod -R 755 /tmp #chmode要有-
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