Book Image

Scala Microservices

By : Selvam Palanimalai, Jatin Puri
Book Image

Scala Microservices

By: Selvam Palanimalai, Jatin Puri

Overview of this book

<p>In this book we will learn what it takes to build great applications using Microservices, the pitfalls associated with such a design and the techniques to avoid them. </p><p>We learn to build highly performant applications using Play Framework. You will understand the importance of writing code that is asynchronous and nonblocking and how Play leverages this paradigm for higher throughput. The book introduces Reactive Manifesto and uses Lagom Framework to implement the suggested paradigms. Lagom teaches us to: build applications that are scalable and resilient to failures, and solves problems faced with microservices like service gateway, service discovery, communication and so on. Message Passing is used as a means to achieve resilience and CQRS with Event Sourcing helps us in modelling data for highly interactive applications. </p><p>The book also shares effective development processes for large teams by using good version control workflow, continuous integration and deployment strategies. We introduce Docker containers and Kubernetes orchestrator. Finally, we look at end to end deployment of a set of scala microservices in kubernetes with load balancing, service discovery and rolling deployments. </p><p></p>
Table of Contents (12 chapters)

Distributed systems and their essentials

There are distributed systems all around us. When there is a coordinated effort by lot of stakeholders to achieve a common goal, we can call it a distributed system. In our daily lives we encounter technology at every turn. The phone call we make, the email we send, the Instagram picture we upload, the Google search we perform. All of them are made possible with a distributed system running behind it.

Distributed system - definition

A distributed system is one in which components located at networked computers communicate and coordinate their actions only by passing messages.

There are a few key traits we can use to identify a distributed system; they are just pointers, not a complete...