title: How to uninstall Hadoop 1.0.0
body: <p>I set up my Hadoop clusters with Hadoop 2.0.2. Then, today I tried to test 1.0.0. So I downloaded the deb file from the Hadoop website and installed it: It did mess up everything. </p>
  
  <p>Now, when I type "which -a hadoop" I get 2 results </p>
  
  <ul>
  <li>one pointing to my old Hadoop installation folder</li>
  <li>and the other one pointing to /usr/bin/hadoop.</li>
  </ul>
  
  <p>So the question is: how to get rid off of Hadoop 1.0.0 completely?</p>