Github user marmbrus commented on the pull request:
https://github.com/apache/spark/pull/9185#issuecomment-154212591
Sessions allow multiple users to share a Spark SQL Cluster without
clobbering each other. Imagine you have multiple R sessions connected to the
same Spark cluster. If one user runs `sql("use database foo")` its going to
break all the other users that are connected.
One question is if a single instance of Spark R needs to be able to have
more than one session (forgive me if this doesn't make sense as I'm super
unfamiliar with our R arch). I think the most important thing is that its
possible to inject an isolate session in to Spark R, not that in a single
instance of Spark R you can have more than one session.
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