Book Image

Mastering Redis

By : Jeremy Nelson
Book Image

Mastering Redis

By: Jeremy Nelson

Overview of this book

Redis is the most popular, open-source, key value data structure server that provides a wide range of capabilities on which multiple platforms can be be built. Its fast and flexible data structures give your existing applications an edge in the development environment. This book is a practical guide which aims to help you deep dive into the world of Redis data structure to exploit its excellent features. We start our journey by understanding the need of Redis in brief, followed by an explanation of Advanced key management. Next, you will learn about design patterns, best practices for using Redis in DevOps environment and Docker containerization paradigm in detail. After this, you will understand the concept of scaling with Redis cluster and Redis Sentinel , followed by a through explanation of incorporating Redis with NoSQL technologies such as Elasticsearch and MongoDB. At the end of this section, you will be able to develop competent applications using these technologies. You will then explore the message queuing and task management features of Redis and will be able to implement them in your applications. Finally, you will learn how Redis can be used to build real-time data analytic dashboards, for different disparate data streams.
Table of Contents (18 chapters)
Mastering Redis
About the Author
About the Reviewers

Redis keyspace notifications

A common use case when using Redis is the ability for an application to respond to changes that may occur to the value stored at a particular key or keys. Fortunately, since version 2.8, Redis provides a mechanism for client code to subscribe to a Pub/Sub channel that monitors events related to data. Called keyspace notification, functionality for monitoring events like all the commands that change a given key, all keys receiving specific commands such as HSET, or all keys that are about to be deleted because of an EXPIRE command. Using Redis Pub/Sub allows existing Redis clients that already implement Pub/Sub to use keyspace notification to respond to changes in the Redis data.

When a command is issued that triggers a Redis keyspace notification, two events occur that monitoring clients can respond to; the first is called a Key-space notification and the second is called a Key-event notification. In a Key-space notification event, a message is sent to a channel...