@MilesYao That may be. On that topic, I don't think anytime soon as Cloudera does not support many features that it does for Spark 1.6. I suspect that sometime post CDH 6 we will see Spark 2.x supplant Spark 1.x as the only version of Spark in CDH.
Ah, I checked out HDP and see what you are getting at. It is really trivial on the difference. Cloudera asks you to put a file on the CM host and configure a separate parcel while HDP includes both Spark1 and Spark2 packages in the same repo.