Book Image

Akka Cookbook

By : Vivek Mishra, Héctor Veiga Ortiz
Book Image

Akka Cookbook

By: Vivek Mishra, Héctor Veiga Ortiz

Overview of this book

Akka is an open source toolkit that simplifies the construction of distributed and concurrent applications on the JVM. This book will teach you how to develop reactive applications in Scala using the Akka framework. This book will show you how to build concurrent, scalable, and reactive applications in Akka. You will see how to create high performance applications, extend applications, build microservices with Lagom, and more. We will explore Akka's actor model and show you how to incorporate concurrency into your applications. The book puts a special emphasis on performance improvement and how to make an application available for users. We also make a special mention of message routing and construction. By the end of this book, you will be able to create a high-performing Scala application using the Akka framework.
Table of Contents (18 chapters)
Title Page
About the Authors
About the Reviewer
Customer Feedback

Enabling Akka clustering for your project

We know how to interact with remote actors--create them, look them up, and send messages. However, Akka remoting requires you to know the actual addresses of actors in order to connect to them. Akka clustering is a layer on top of Akka remoting that helps you manage remote actors to provide a decentralized fault-tolerant service.

Akka clustering brings in a few new concepts:

  • Node: This is a logical member of a cluster. It is defined by a hostname:port:uid tuple.
  • Cluster: This is a set of nodes joined together through a membership service. Akka clustering utilizes the Gossip protocol to maintain a decentralized registry of nodes in a cluster.
  • Leader: A single node in the cluster acts as a leader. The leader manages the convergence and membership state transitions.
  • Seed nodes: These are a set of nodes that are used by other nodes to join the cluster.
  • Failure detector: This is responsible for trying to detect whether a node is unreachable from the rest of...