title: Issue while opening Spark shell
body: <p>I am trying to open spark using command </p>
  
  <blockquote>
    <p>$ spark-shell</p>
  </blockquote>
  
  <p>but getting warning. How to fix it.</p>
  
  <p><strong>Warning:</strong></p>
  
  <pre><code>WARN util.Utils: Service 'SparkUI' could not bind on port 4040. Attempting port 4041.
  </code></pre>