Spark DataFrame courses If I understand the Databricks philosophy correctly, Spark will soon be heavily moving toward dataframes, i.e. away from the usual map/reduce on RDDs. I was wondering if there are any good suggestions for online courses or books that introduce Spark from the dataframe point of view? I know Databricks has a good number of resources on dataframes but I would really like to see some more detailed courses.
edX offers some spark courses. Try the following:

https://www.edx.org/course/introduction-apache-spark-uc-berkeleyx-cs105x?gclid=CjwKEAjwm8-6BRDgnb-Dk96UmRASJADbMycYmMKC3xWs_3jGV9pUd0k3gxIbQRHE2H4_hlXeNMw1BhoCqHjw_wcB

I believe this is through a partnership with Databricks