Book Image

Apache Kafka Quick Start Guide

By : Raúl Estrada
Book Image

Apache Kafka Quick Start Guide

By: Raúl Estrada

Overview of this book

Apache Kafka is a great open source platform for handling your real-time data pipeline to ensure high-speed filtering and pattern matching on the ?y. In this book, you will learn how to use Apache Kafka for efficient processing of distributed applications and will get familiar with solving everyday problems in fast data and processing pipelines. This book focuses on programming rather than the configuration management of Kafka clusters or DevOps. It starts off with the installation and setting up the development environment, before quickly moving on to performing fundamental messaging operations such as validation and enrichment. Here you will learn about message composition with pure Kafka API and Kafka Streams. You will look into the transformation of messages in different formats, such asext, binary, XML, JSON, and AVRO. Next, you will learn how to expose the schemas contained in Kafka with the Schema Registry. You will then learn how to work with all relevant connectors with Kafka Connect. While working with Kafka Streams, you will perform various interesting operations on streams, such as windowing, joins, and aggregations. Finally, through KSQL, you will learn how to retrieve, insert, modify, and delete data streams, and how to manipulate watermarks and windows.
Table of Contents (10 chapters)

Late event generation

To test the Kafka Streams solution for late events, the first thing we need is a late event generator.

To simplify things, our generator will constantly send events at a fixed rate. And from time to time, it will generate a late event. The generator generates events with the following process:

  • Each window is 10 seconds long
  • It produces one event every second
  • The event should be generated in 54th second of each minute, and will be delayed by 12 seconds; that is, it will arrive in the sixth second of the next minute (in the next window)

When we say that the window is of 10 seconds, we mean that we will make aggregations every 10 seconds. Remember that the objective of the test is that the late events are counted in the correct window.

Create the src/main/java/kioto/events directory and, inside it, create a file called with the contents...