title: Should I call session.close() and cluster. close() after each web API call
body: <p>I have an webservice API allowing client to insert into Cassandra.
  I read the document on the page of datastax (<a href="http://www.datastax.com/drivers/java/2.0/com/datastax/driver/core/Session.html" rel="noreferrer">http://www.datastax.com/drivers/java/2.0/com/datastax/driver/core/Session.html</a>) stating that we should keep the session and cluster object till the end of the application. I was wondering should I call session.close() and cluster.close() after each web API call or I just keep the session until I shutdown web server?</p>