title: Hadoop Namenode safemode error
body: <p>My environment is hadoop 0.23.5 cluster( three nodes: two for namenode, one for nodemangement &amp; resourcemangement and both three nodes are datanode)</p>
  
  <p>I google all the answers about how to leave namenode safemode and got the same answer :</p>
  
  <pre><code>hadoop dfsadmin -safemode leave
  </code></pre>
  
  <p>because I run hadoop 0.23.5 on ubuntu 12.10 and it seems that need to be changed to :</p>
  
  <pre><code>hdfs dfsadmin -safemode leave
  </code></pre>
  
  <p>but I still got the error below...</p>
  
  <pre><code>safemode: FileSystem file:/// is not an HDFS file system
  </code></pre>
  
  <p>does anyone knows how's going on?</p>
  
  <p>It would be very appreciated for your time to give me some advice..</p>