Congratulations! You’ve just finished your first coding adventure with PySpark! In this lesson, we learned that:

• RDDs are the foundational data structure of Spark
• RDDs are fault-tolerant, partitioned, and operated on in parallel
• Transformations are lazy and do not execute until an action is called

We also learned how to:

• Transform and summarize RDDs with transformations and actions
• Send information to all nodes with broadcast variables
• Debug work with accumulator variables