Last time I walked you through how to install Cassandra in the simplest manner possible. Which was as a single node installation using the DataStax community edition.
All good stuff. So I have also just written up how you might use Scala/DataStax Cassandra/Spark connector, to allow you to retrieve data from Cassandra into Spark RDDs and Cassandra tables to be hydrated into Spark RDDs.
These 2 Cassandra articles and the 1st Spark one kind of form a series of articles, which you can find using the series links at the top of the articles.
Anyway here is the latest installment