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)

Using the Schema Registry

Now, the Schema Registry is running on port 8081. To interact with the Schema Registry, there is a REST API. We can access it with curl. The first step is to register a schema in the Schema Registry. To do so, we have to embed our JSON schema in another JSON object, and we have to escape some special characters and add a payload:

  • At the beginning, we have to add { \"schema\": \"
  • All the double quotation marks (") should be escaped with a backslash (\")
  • At the end, we have to add \" }

Yes, as you can guess, the API has several commands to query the Schema Registry.

Registering a new version of a schema under a – value subject

To register the Avro schema healthcheck...