title: Hierarchical Agglomerative clustering in Spark
body: <p>I am working on a clustering problem and it has to be scalable for a lot of data. I would like to try hierarchical clustering in Spark and compare my results with other methods. </p>
  
  <p>I have done some research on the web about using hierarchical clustering with Spark but haven't found any promising information. </p>
  
  <p>If anyone has some insight about it, I would be very grateful.
  Thank you.</p>