Redis Tutoring

Blackie2015/10/12

Redis IntroductionStackExchange.Redis IntroductionRedisDemo IntroductionTools

Who am I

Blackie TsaiSenior IT consultant of Xuenn

Full stack developerMajor on development of real-time transaction system with low latency and high concurrentLearning CI&CD and run with Agile&LEAN

Bloghttp://www.dotblogs.com.tw/blackie1019

REDIS INTRODUCTION

Redis

Redis - A.K.A Remote Directory Server. It is an open source (BSD licensed), one of Key-Value database of NoSQL, in-memory data structure store, used as database, cache and message broker. It also can run atomic operations.Most Popular NoSQL(http://techstacks.io/)Recommend using Linux for deploying.Features

Pure SimpleSingle TreadIn-memory but persistent on disk databaseRemote dictionary server

3.0.4 is the latest stable version.

開源資料庫Redis實戰經驗大公開

https://www.g2crowd.com/press-release/best-nosql-databases-fall-2015/

https://clusterhq.com/assets/pdfs/state-of-container-usage-june-2015.pdf

Over 70% would like to run a database or other stateful service in their container environments, with MySQL and Redis the two leading choicesImportant features for data management in container solutions were:

Integration of data management capabilities into existing container work flow and toolsseamless movement of data between dev, test and production environments.

Who using Redis

Facebook’s Instagram: Making the Switch to Cassandra from Redis, a 75% ‘Insta’ Savings

http://techstacks.io/tech/redis、http://redis.io/topics/whos-using-redis

http://redis.io/clients

Redis - Data Persistence

MasterRedis

SlaverRedis

Persistence to Disk

Server A

Server B

Replication

IMPLEMENTING PERSISTENCE IN REDIS

• Master instance with no persistence• Slave instance with AOF enabled

Redis - PubSub

SignalR Scaleout with Redis

Redis - Insight Of Pit

Server-side session with RedisRedis has many eviction policies, but most of them are based on 'sampling‘.Alternative Solution

Use Database as an another back-endUse Redis 3.0

Maximize CPUs usageRedis is single thread. One instance usually only use one CPU

Redis, another step on the road

Redis - DataStore

http://redis.io/commands#stringhttp://redis.io/commands#hashhttp://redis.io/commands#sethttp://redis.io/commands#sorted_sethttp://redis.io/commands#list

Redis – LUA Script

Redis embedded scripting languageGood Learning : Lua: 给 Redis 用户的入门指导5 Methods For Tracing and Debugging Redis Lua Scripts

http://redis.io/commands/eval

STACKEXCHANGE.REDIS INTRODUCTION

Stack Exchange

The world’s largest programmingcommunity is growingStack Exchange is a network of 130+ Q&A communities including Stack OverflowGlobal traffic ranking 54th largest website

Architecture of Stack Exchange

http://stackexchange.com/performance

Stack Exchange - Info

Stack Overflow still uses Microsoft products.Stack Overflow still uses a scale-up strategy with HA.SQL Servers loaded with 384 GB of RAM and 2TB of SSD.Stats

4 million users, 8 million questions, 40 million answers, 560 million pageviews a month.Peak is more like 2600-3000 requests/sec on most weekdays. 25 servers, Stack Overflow has a 40:60 read-write ratio. 2 TB of SQL data all stored on SSDs, Each web server has 2x 320GB SSDs in a RAID 1.DB servers average 10% CPU utilization, 11 web servers, using IIS.2 load balancers, 1 active, using HAProxy4 active database nodes, using MS SQL2 machines for distributed cache and messaging using Redis2 read-only SQL Servers for used mainly for the Stack Exchange API3 machines doing search with ElasticSearch

Stack Exchange - Caching

CachingCache all the things.

5 levels of caches.

1st: Caching in the browser, CDN, and proxies.

2nd: Using HttpRuntime.Cache. An in-memory,

per server cache.

3rd: Redis.

4th: SQL Server

Cache. 5th: SSD

.

Stack Exchange - Lessons Learned

Why use Redis if you use MS products? gabeech: It's not about OS evangelism. We run things on the platform they run best on. Period. C# runs best on a windows machine, we use IIS. Redis runs best on a *nix machine we use *nix.

Overkill as a strategySSDs RockKnow your read/write workloadKeeping things very efficient means new machines are not needed oftenDon’t be afraid to specializeDo only what needs to be doneReinvention is OKGo down to the bare metal No bureaucracy.Garbage collection driven programmingThe cost of inefficient code can be higher than you think

StackExchange.Redis

Basic Usage - getting started and basic usageConfiguration - options available when connecting to redisPipelines and Multiplexers - what is a multiplexer?Keys, Values and Channels - discusses the data-types used on the APITransactions - how atomic transactions work in redisEvents - the events available for logging / information purposesPub/Sub Message Order - advice on sequential and concurrent processingScripting - running Lua scripts with convenient named parameter replacement

https://github.com/StackExchange/StackExchange.Redis

How to use

Configuration

Automatic and Manual ConfigurationString Parse Constructor

New Constructor

Configuration OptionsRenaming CommandsTwemproxy

StackExchange.Redis Configuration

REDISDEMO INTRODUCTION

RedisDemo

FeaturesConnection Mapping with ConfigurationConfiguration with Redis Instance Group and Name concept supportedSingleton pattern avoid resource waste

DependencyStackExchange.RedisFX.ConfigurationNewtonsoft.JsonLog4Net(Optional)

Demo Versionhttps://github.com/blackie1019/RedisDemo

RedisDemo - Configuration

ConnectionSetting follow StackExchange.RedisConfigurationOptions.Parse()

RedisDemo Framework - Example

Example Lab

Example – Basic StringsListsSetsHashesSorted Sets

Example – AdvanceSortExpireHashSet, HashGetAll and HashDeletePub/SubPipelinesBatch

Example – Scripting

https://github.com/blackie1019/RedisDemo

TOOLS

Redis Data Management

Cross-platform redis desktop manager - desktop management GUI for mac OS X, Windows, Debian and Ubuntu.

http://redisdesktop.com

Opserver

Monitoring Tool of Stack ExchangeServersSQL clusters/instancesRedisElastic searchException logsHaproxy

Redis Server with Docker

Enable Virtualization Technology on Bios and install Docker ToolboxCreate a Docker container for RedisRun the serviceCreate your web application container

If any problem you can remove and setup againdocker-machine rm defaultdocker-machine --native-ssh create -d virtualbox default

Dockerizing a Redis service

Reference

Scaling Stack Overflow (QCon NYC 2015)Redis, another step on the roadTypes of NoSQL databasesStackOverflow Update: 560M Pageviews A Month, 25 Servers, And It's All About PerformanceRedis 设计与实现《Redis 设计与实现》图片集