Spark Dataframes Tutorials

I've got a new post up at my personal blog, and it's a tutorial about Apache Spark. If you are new to Spark, it's a 'big data' solution. I'm very new to it myself, but since there seem to be very few tutorials about Spark online, I thought it would be worth posting one, particularly about dataframes. Dataframes have been part of Spark since Spark 1.3. If you want to learn more, check out my Spark dataframes tutorial in Python. I have recently updated the tutorial to Spark 2.1, so it is much more current than when I first posted it here.