Run your first Spark program - the ratings histogram example

We just installed 100,000 movie ratings, and we now have everything we need to actually run some Spark code and get some results out of all this work that we've done so far, so let's go ahead and do that. We're going to construct a histogram of our ratings data. Of those 100,000 movie ratings that we just installed, we want to figure out how many are five star ratings, how many four stars, three stars, two stars, and one star, for example. It's really easy to do. The first thing you need to do though is to download the ratings-counter.py script from the download package for this book, so if you haven't done that already, take care of that right now. When we're ready to move on, let's walk through what to do with that script and we'll actually get a payoff out of all this work and then run some Spark code and see what it does.