Kafka Streams in Action, Second Edition

4 Kafka clients

This chapter covers

• Producing records with KafkaProducer
• Understanding message delivery semantics
• Consuming records with KafkaConsumer
• Learning about Kafka’s exactly-once streaming
• Using the Admin API for programmatic topic management
• Handling multiple event types in a single topic

This chapter is where the “rubber hits the road.” We take what you’ve learned over the previous two chapters and apply it here to start building event streaming applications. We’ll begin by working individually with the producer and consumer clients to understand how each works.

4.1 Introducing Kafka clients

In their simplest form, clients operate like this: producers send records (in a produce request) to a broker, the broker stores them ...