Book Image

Learning Apache Flink

By : Tanmay Deshpande
Book Image

Learning Apache Flink

By: Tanmay Deshpande

Overview of this book

<p>With the advent of massive computer systems, organizations in different domains generate large amounts of data on a real-time basis. The latest entrant to big data processing, Apache Flink, is designed to process continuous streams of data at a lightning fast pace.</p> <p>This book will be your definitive guide to batch and stream data processing with Apache Flink. The book begins with introducing the Apache Flink ecosystem, setting it up and using the DataSet and DataStream API for processing batch and streaming datasets. Bringing the power of SQL to Flink, this book will then explore the Table API for querying and manipulating data. In the latter half of the book, readers will get to learn the remaining ecosystem of Apache Flink to achieve complex tasks such as event processing, machine learning, and graph processing. The final part of the book would consist of topics such as scaling Flink solutions, performance optimization and integrating Flink with other tools such as ElasticSearch.</p> <p>Whether you want to dive deeper into Apache Flink, or want to investigate how to get more out of this powerful technology, you’ll find everything you need inside.</p>
Table of Contents (17 chapters)
Learning Apache Flink
About the Author
About the Reviewers
Customer Feedback

Registering a custom serializer

In the distributed computing world, it is very important to take care of each and every small thing. Serialization is one of them. By default, Flink uses the Kryo serializer. Flink also allows us to write custom serializers in case you think the default one is not good enough. We need to register the custom serializer in order for Flink to understand it. Registering the custom serializer is very simple; we just need to register its class type in the Flink execution environment. The following code snippet shows how we do that:

final ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment(); 
// register the class of the serializer as serializer for a type 
env.getConfig().registerTypeWithKryoSerializer(MyCustomType.class, MyCustomSerializer.class); 
// register an instance as serializer for a type 
MySerializer mySerializer = new MySerializer();