title: "nc -lk 9999" shows no output for spark streaming in VM
body: <p>I followed <a href="https://spark.apache.org/docs/1.2.0/streaming-programming-guide.html" rel="nofollow noreferrer">https://spark.apache.org/docs/1.2.0/streaming-programming-guide.html</a> for spark streaming. I ran the program <code>network_wordcount.py</code> given in github. Started worker and master. Then on one terminal executed <code>nc -lk 9999</code> and on another <code>./network_wordcount.py localhost 9999</code>.
  Output of <code>nc -lk 9999</code> is just <code>blank</code>. Shows nothing.</p>
  
  <p>Output of <code>./spark-submit network_wordcount.py localhost 9999</code> shows only <code>INFO:</code> which seems never ending:</p>
  
  <p>I'm not getting the output the document shows. No data is being streamed. Is there something I'm missing out for streaming to happen?</p>