“Kafka in Action” by Dylan Scott, Viktor Gamov, and Dave Klein is a comprehensive guide to Apache Kafka, a distributed streaming platform that is widely used for building real-time data pipelines and streaming applications.

The book covers a wide range of topics, including:

1. Introduction to Apache Kafka: The book provides an overview of Kafka and its architecture, including topics, partitions, brokers, and consumers.
2. Building Kafka applications: The book covers how to build Kafka applications using popular programming languages like Java, Scala, and Python.
3. Kafka streams: The book covers Kafka Streams, a lightweight stream processing library that allows you to process data in real-time.
4. Integrating Kafka with other systems: The book covers how to integrate Kafka with other systems like Hadoop, Spark, and Flink.
5. Monitoring and managing Kafka: The book covers how to monitor and manage Kafka using tools like Kafka Manager and Prometheus.

Overall, “Kafka in Action” is a comprehensive guide to Apache Kafka that covers both the fundamentals and advanced topics. It is a valuable resource for developers, architects, and data engineers who are building real-time data pipelines and streaming applications.