title: Can not create directory on hdfs of hadoop
body: <p>I can not operate my hdfs about permission. I executed hadoop fs -ls /  and return<br>
  drwx------   - ubuntu supergroup          0 2015-09-02 09:58 /tmp<br>
  user of OS is user1,  </p>
  
  <p>How to change the user of hdfs to user1? I add dfs.permissions.enabled to false in hdfs-site.xml, and format hdfs again, but the problem still exists.<br>
  could anybody help me ?</p>