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.

Preface

Who this book is for

What this book covers

To get the most out of this book

Free Chapter

Configuring Kafka

Configuring Kafka

Kafka in a nutshell

Kafka installation

Running Confluent Platform

Running Kafka brokers

Running Kafka topics

A command-line message producer

A command-line message consumer

Message Validation

Message Validation

Enterprise service bus in a nutshell

Setting up the project

Reading from Kafka

Writing to Kafka

Running the processing engine

Coding a validator in Java

Running the validation

Message Enrichment

Message Enrichment

Extracting the geographic location

Enriching the messages

Extracting the currency price

Enriching with currency price

Running the engine

Extracting the weather data

Serialization

Kioto, a Kafka IoT company

HealthCheck message

Java PlainProducer

Running the PlainProducer

Java plain consumer

Java PlainProcessor

Running the PlainProcessor

Custom serializer

Java CustomProducer

Running the CustomProducer

Custom deserializer

Java custom consumer

Java custom processor

Running the custom processor

Schema Registry

Schema Registry

Avro in a nutshell

Defining the schema

Starting the Schema Registry

Using the Schema Registry

Java AvroProducer

Running the AvroProducer

Java AvroConsumer

Java AvroProcessor

Running the AvroProcessor

Kafka Streams

Kafka Streams in a nutshell

Java PlainStreamsProcessor

Running the PlainStreamsProcessor

Scaling out with Kafka Streams

Java CustomStreamsProcessor

Running the CustomStreamsProcessor

Java AvroStreamsProcessor

Running the AvroStreamsProcessor

Late event processing

Late event generation

Running the EventProducer

Kafka Streams processor

Running the Streams processor

Stream processor analysis

KSQL

KSQL in a nutshell

Using the KSQL CLI

Processing data with KSQL

Writing to a topic

Kafka Connect

Kafka Connect in a nutshell

Spark Streaming processor

Reading Kafka from Spark

Data conversion

Data processing

Writing to Kafka from Spark

Running the SparkProcessor

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Kafka Connect in a nutshell

Kafka Connect is an open source framework, part of Apache Kafka; it is used to connect Kafka with other systems, such as structured databases, column stores, key-value stores, filesystems, and search engines.

Kafka Connect has a wide range of built-in connectors. If we are reading from the external system, it is called a data source; if we are writing to the external system, it is called a data sink.

In previous chapters, we created a Java Kafka Producer that sends JSON data to a topic called healthchecks in messages like these three:

{"event":"HEALTH_CHECK","factory":"Lake Anyaport","serialNumber":"EW05-HV36","type":"WIND","status":"STARTING","lastStartedAt":"2018-09-17T11:05:26.094+0000","temperature":62.0,"ipAddress...