Book Image

Mastering Redis

By : Vidyasagar N V, Jeremy Nelson
Book Image

Mastering Redis

By: Vidyasagar N V, 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.

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Mastering Redis
Vidyasagar N V | Jeremy Nelson
May, 2016 | 366 pages
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Table of Contents (18 chapters)
Mastering Redis
Mastering Redis
Credits
Credits
About the Author
About the Author
About the Reviewers
About the Reviewers
www.PacktPub.com
www.PacktPub.com
Preface
Preface
Free Chapter
1
Why Redis?
Why Redis?
Is Redis right for me?
Experimenting with Redis
Popular usage patterns
Redis isn't right because …try again soon!
Summary
2
Advanced Key Management and Data Structures
Advanced Key Management and Data Structures
Redis keys
Manually creating a Redis schema
Deconstructing a Redis object mapper
Big O notation
Reviewing the time complexity of Redis data structures
Sorted sets
Advanced sorted set operations
Bitstrings and bit operations
HyperLogLogs
Summary
3
Managing RAM – Tips and Techniques for Redis Memory Management
Managing RAM – Tips and Techniques for Redis Memory Management
Configuring Redis
32-bit Redis
Key expiration
LRU key evictions
Creating memory efficient Redis data structures
Hardware and network latencies
Operating system tips
Summary
4
Programming Redis Part One – Redis Core, Clients, and Languages
Programming Redis Part One – Redis Core, Clients, and Languages
Redis internals
Coroutines using Redis and Python
Summary
5
Programming Redis Part Two – Lua Scripting, Administration, and DevOps
Programming Redis Part Two – Lua Scripting, Administration, and DevOps
The use of Lua in Redis
Using KEYS and ARGV with Redis
Advanced Lua scripting with Redis
Programming Redis administration topics
Redis role in DevOps
Summary
6
Scaling with Redis Cluster and Sentinel
Scaling with Redis Cluster and Sentinel
Approaches to partitioning data
Clustering Redis with Twemproxy
Redis Cluster background
Overview of running Redis Cluster
Using Redis Cluster
Monitoring with Redis Sentinel
Summary
7
Redis and Complementary NoSQL Technologies
Redis and Complementary NoSQL Technologies
The proliferation of NoSQL
Redis as an analytics complement to MongoDB
Redis as a preprocessor complement to ElasticSearch
Redis as a smart cache complement to Fedora Commons
Summary
8
Docker Containers and Cloud Deployments
Docker Containers and Cloud Deployments
Linux containers
Docker basics with Redis
Layers in Docker images
Hosting and publishing Docker images
Docker and Redis issues
Packaging your application with Docker Compose
Redis and AWS
Dedicated cloud hosting options
Redis Labs
Summary
9
Task Management and Messaging Queuing
Task Management and Messaging Queuing
Overview of Redis Pub/Sub
Pub/Sub RESP replies
Redis Pub/Sub in action
Redis keyspace notifications
Task management with Redis and Celery
GIS and RestMQ
Messaging with Redis technologies
Summary
10
Measuring and Managing Information Streams
Measuring and Managing Information Streams
Extracting, transforming, and loading information with Redis
Machine learning and Redis
Summary
Sources
Sources
Chapter 1: Why Redis?
Chapter 2: Advanced Key Management and Data Structures
Chapter 3: Managing RAM – Tips and Techniques for Redis Memory Management
Chapter 6: Scaling with Redis Cluster and Sentinel
Chapter 7: Redis and Complementary NoSQL Technologies
Chapter 10: Measuring and Managing Information Streams
Index
Index

Pub/Sub RESP replies

In Redis Pub/Sub, the messaging format is in RESP Array reply with three or four elements. The first element in the Pub/Sub messaging format determines the type of message and can be one of these four Redis commands, SUBSCRIBE, UNSCRIBE, PSUBSCRIBE, and PUNSUBSCRIBE.

SUBSCRIBE and UNSUBSCRIBE RESP Arrays

Connecting to a Redis instance with two connections, the first with a standard Redis CLI client and the second with telnet, we will illustrate the RESP reply for three element commands SUBSCRIBE and UNSUBSCRIBE:

$ telnet localhost 6379
Trying ::1...
Connected to localhost.
Escape character is '^]'.
SUBSCRIBE info
*3
$9
subscribe
$4
info
:1

In this SUBSCRIBE command, the first element is $9 followed by carriage-return line feed. The second element is the channel, info, that the client is subscribing to, with the third element in a subscribe message being the number of channels that the client is currently subscribed to receive messages. In our Redis CLI, we'll send a message...

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