title: Multiple Spark Sessions in single JVM
body: <p>I have a query regarding creating multiple spark sessions in one JVM.  <code>SPARK-2243</code> says that creating multiple Sparkcontexts is not supported. Is it true for the SparkSession in Spark 2.0 as well. I also read about the <code>cloneSession</code> method in SparkSession API, which allows creating an identical copy of a <code>SparkSession</code> and share the underlying <code>SparkContext</code> between the two sessions. Does this mean that there can be multiple SparkSessions in one JVM?</p>