Streaming systems allow you to minimize the time between an event and information processing so that you receive results in real time. In financial, security and IoT applications, every millisecond is important, so streaming systems are indispensable. Also, it’s fashionable and brings in money ;) ! It's no coincidence that experts in Spark, Heron and Kafka are in such high demand. Finally, you can get acquainted with creating streaming applications and real-time event processing without having to wade through the technical details of specific frameworks, confusing terms and complex formulations. With simple language and clear examples, you'll be introduced to the basic concepts, and you'll be able to build your own simple streaming program from scratch to master the ideas and techniques described.

No experience with streaming systems is required from the reader. The examples are written in Java.