title: How to use two versions of spark shell?
body: <p>I have <strong>Spark 1.6.2</strong> and <strong>Spark 2.0</strong> installed on my hortonworks cluster.</p>
  
  <p>Both these versions are installed on a node in the Hadoop Cluster of 5 nodes.</p>
  
  <p>Each time I start the <code>spark-shell</code> I get:</p>
  
  <pre><code>$ spark-shell
  Multiple versions of Spark are installed but SPARK_MAJOR_VERSION is not set
  Spark1 will be picked by default
  </code></pre>
  
  <p>When I check the version I get:</p>
  
  <pre><code>scala&gt; sc.version
  res0: String = 1.6.2
  </code></pre>
  
  <p>How can I start the other version(spark-shell of Spark2.0)?</p>