title: Available ports for brokers in MapR cluster
body: <p>I have written some program which use two brokers to send the messages..as follow:</p>
  
  <pre><code>val kafkaBrokers = "172.16.50.64:9092,172.16.50.65:9093"
  </code></pre>
  
  <p>The IPs are the address of the cluster nodes but I get </p>
  
  <pre><code>java.nio.channels.ClosedChannelException
  org.apache.spark.SparkException: java.nio.channels.ClosedChannelException
  java.nio.channels.ClosedChannelException..
  </code></pre>
  
  <p>I wanted to know which ports I can use for a MapR cluster..</p>