As you might already have understood from the previous chapters, Apache Spark is currently in transition from RDD-based data processing to a more structured one, backed by DataFrames and Datasets in order to let Catalyst and Tungsten kick in for performance optimizations. This means that the community currently uses a double-tracked approach. While the unstructured APIs are still supported--they haven't even been marked as deprecated yet ,and it is questionable if they ever will--a new set of structured APIs has been introduced for various components with Apache Spark V 2.0, and this is also true for Spark Streaming. Structured Steaming was marked stable in Apache Spark V 2.2. Note that, as of Apache Spark V 2.1 when we started writing this chapter, Structured Streaming is was marked as alpha. This is another example of the extreme pace at which Apache...




















































