Redis and its many use cases

Redis and its many uses Christian Joudrey - @cjoudrey

‘‘Redis is an open source, advanced key-value store. ’’

Key-value what?!

SET name "fido"GET name=> "fido"

EXPIRE name 120

So its likememcached?

Atomic operations

SET count 0INCR count=> 1

Ordered lists

LPUSH friends "Tom"LPUSH friends "Sam"LLEN friends=> 2

LPUSH RPUSH Sam Tom

LRANGE friends 0 0=> ["Sam"]LRANGE friends 0 -1=> ["Sam", "Tom"]

Sets, Hashes, Sorted Sets

Save to disk

Download ithttp://redis.io/download... and try it ... $ redis-cli redis> SET name "Chris" OK redis> GET name "Chris"

What about node?!

GitHub http://git.io/redis... or via npm ... $ npm install redis

Use case #1:Caching

var redis = require(redis), client = redis.createClient();function getSomeValue (callback) { client.get(someVal, function (err, val) { if (val) return callback(null, val); // Do call directly to Db // and cache result. });};

Use case #2:Session store

var app = require(express).createServer();var RedisStore = require(connect-redis)(express);app.use(express.session({ secret: keyboard cat, store: new RedisStore}));app.get(/, function(req, res){ res.send(hello world);});app.listen(3000);http://expressjs.com/guide.html#session-support

Use case #3:Pub/Sub

Chat ChatServer Server Load Balancer

Use case #4:Job Queue

i.e.:Image resize API

1) Download image 2) Resize image with GD Node ServerGET /image_resize?url=http://...

orker Job Resize Queue Workers1) Download image Node2) Resize image with GD Server GET /image_resize?url=http://...

Kuehttps://github.com/learnboost/kue

Theres a lot more! 11 Common Web Use Cases Solved in Redis http://bit.ly/pgDmXn

Questions? :)

Redis and its many use cases

by Christian Joudrey

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