title: Can Apache YARN be used without HDFS?
body: <p>I want to use Apache YARN as a cluster and resource manager for running a framework where resources would be shared across different task of the same framework. I want to use my own distributed off-heap file system. </p>
  
  <ol>
  <li><p>Is it possible to use any other distributed file system with YARN
  other than HDFS?  </p></li>
  <li><p>If yes, what HDFS APIs need to be implemented?</p></li>
  <li>What Hadoop components are required to run YARN?</li>
  </ol>