title: Secondary namenode on Hadoop 2.x (Hortonworks)
body: <p>I am learning hadoop 2.x technology in Hortonworks, cloudera, and I have noticed that there is no <em>secondary namenode</em> in the architecture of hadoop 2.x; it was replaced by a <em>standby namenode</em>. </p>
  
  <ul>
  <li><p>Is the <em>secondary node</em> deprecated? For what I understood, the <em>standby namenode</em> functions differ from the secondary namenode functions.</p></li>
  <li><p>Can I build <em>Hadoop</em> without a <em>secondary namenode</em> and <em>standby namenode</em> without loss of performance?</p></li>
  </ul>