In this chapter, you saw how difficult the testing and debugging your Spark applications are. These can even be more critical in a distributed environment. We also discussed some advanced ways to tackle them altogether. In summary, you learned the way of testing in a distributed environment. Then you learned a better way of testing your Spark application. Finally, we discussed some advanced ways of debugging Spark applications.
We believe that this book will help you to gain some good understanding of Spark. Nevertheless, due to page limitation, we could not cover many APIs and their underlying functionalities. If you face any issues, please don't forget to report this to Spark user mailing list at user@spark.apache.org. Before doing so, make sure that you have subscribed to it.
This is more or less the end of our little journey with advanced topics on Spark. Now...
