Book Image

Redis 4.x Cookbook

Book Image

Redis 4.x Cookbook

Overview of this book

Redis is considered the world's most popular key-value store database. Its versatility and the wide variety of use cases it enables have made it a popular choice of database for many enterprises. Based on the latest version of Redis, this book provides both step-by-step recipes and relevant the background information required to utilize its features to the fullest. It covers everything from a basic understanding of Redis data types to advanced aspects of Redis high availability, clustering, administration, and troubleshooting. This book will be your great companion to master all aspects of Redis. The book starts off by installing and configuring Redis for you to get started with ease. Moving on, all the data types and features of Redis are introduced in detail. Next, you will learn how to develop applications with Redis in Java, Python, and the Spring Boot web framework. You will also learn replication tasks, which will help you to troubleshoot replication issues. Furthermore, you will learn the steps that need to be undertaken to ensure high availability on your cluster and during production deployment. Toward the end of the book, you will learn the topmost tasks that will help you to troubleshoot your ecosystem efficiently, along with extending Redis by using different modules.
Table of Contents (21 chapters)
Title Page
Packt Upsell
Windows Environment Setup

Troubleshooting latency issues

Redis is designed to serve a large number of queries at an extremely fast speed. In most scenarios, there is a strict requirement for the response time between a client and the Redis Server. Therefore, high latency becomes the most fatal problem for the Redis online service. In this recipe, we will see how to measure and detect the latency of Redis, and also give you several possible clues to where the latency issue happens.

Getting ready…

You need to finish setting up the replication of the Redis Server as we described in the Setting up Redis replication recipe in Chapter 5, Replication.

For demonstration purposes, we populate a large amount of data:

for i in `seq 10`
nohup node generator.js hash 1000000 session:${i} & 

How to do it...

The first action is to do the baseline latency measurement:

  1. Before you put the Redis service online, run an intrinsic-latency test on the host where the Redis Server is running:
$ bin/redis-cli --intrinsic-latency 60