Redis

маленький помощникбольших приложений Андрей Савченко Aejis

Что такое Redis?Key-value хранилищеPublish-subscribe сервер

ОсобенностиВысокая скоростьПерсистентность данныхТранзакции, репликация

Типы данныхСтрока (String)Хеш (Hash)Список (List)Множество (Set)Упорядоченное множество (Sorted set)

КлиентыActionScript, C, C#, C++, Clojure, Common Lisp, Erlang, Go, Haskell, haXe, Io, Java, Lua, Node.js, Objective-C, Perl, PHP, Python, Ruby, Scala, Smalltalk, Tcl

CтрокиSET testkey “Hello”GET testkeyMSET key1 “Hello” key2 “world”SET counter 1INCR counterGET counter #=> “2”

XешиHSET test key1 “Hello”HSET test key2 “World”HGET test key2 #=> “World”HGETALL test #=> “key1” “Hello” “key2” “World”

СпискиRPUSH test “zero”RPUSH test “one”RPUSH test “two”LRANGE test 1 2 #=> “one” “two”

МножестваSADD users “andrey”SADD users “dima”SCARD users #=> 2SISMEMBER users “andrey” #=> 1SISMEMBER users “gleb” #=> 0

Практическое применение

Кеши, сессии Инвалидация по времениSET a18f045 “cache content”EXPIRE a18f045 100

Кеши, сессии Инвалидация по признакуSET a18b045 “cache content”SET d98f0c9 “cache content”SADD cond1 a18b045SADD cond1 d98f0c9SMEMBERS cond1DEL {result of smembers}

Хранение несвязанных (малосвязанных) данных{user_id = 1}HSET settings:1 receive_emails “1”HSET settings:1 records_per_page “20”HSET settings:1 preffered_syntax “markdown”HGETALL settings:1

Сбор статистики{post_id=42}INCR posts:42GET posts:42 # How many views/votes?ZINCRBY posts 1 42ZSCORE posts 42 # How many views/votes?ZREVRANGE posts O 9 # TOP-10 postsZREVRANGE posts O 9 WITHSCORES # TOP-10 withviews/votes quantity

Связь между демонами Websocket server Web-application Async jobs server

Связь между демонами# Websocket server:SUBSCRIBE messages# Async jobs server:SUBSCRIBE jobs# Web-application:PUBLISH jobs “videos:12:mpeg:ogg”PUBLISH messages “Video encoding #12 started”# Async jobs server:PUBLISH messages “Video encoding #12 finished”

Построение простых графов# User 1 adds user 5 to friendsSADD users:1:friends 5SADD users:5:friend_of 1...# Get user 5 friendsSMEMBERS users:5:friends# Get user 5 mutual friendsSCARD users:5:friends users:5:friend_of# Get common friens of user 5 and 7SCARD users:5:friends users:7:friends# Are user 7 friend of user 5?SISMEMBER users:5:friends 7

Вопросы?redis.io/commands andrey@aejis.eutwitter.com/ptico

Redis

by Ptico on Oct 12, 2011

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