[Spark 1.5.2 ]-how to set and get Storage level for Dataframe

[Divya Gehlot]

Hi,
How can I get and set storage level for Dataframes like RDDs ,
as mentioned in following  book links
https://jaceklaskowski.gitbooks.io/mastering-apache-spark/content/spark-rdd-caching.html



Thanks,
Divya