Redis is an open source, advanced key-value store that can be used for caching, sessions, publishing/subscribing, job queues, and more. It supports atomic operations, ordered lists, sets, hashes and sorted sets. Data can be saved to disk for persistence. Redis has client libraries for many languages like Node.js and can be accessed via a command line interface. Popular use cases include caching application data to improve performance, storing sessions to allow user authentication across requests, and processing jobs asynchronously in the background via pub/sub and queues.

1. Redis and its many uses
Christian Joudrey - @cjoudrey

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

3. Key-value what?!

4. SET name "fido"
GET name
=> "fido"

5. EXPIRE name 120

6. So it's like
memcached?

7. Atomic operations

8. SET count 0
INCR count
=> 1

9. Ordered lists

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

11. LPUSH RPUSH
Sam Tom

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

13. Sets, Hashes,
Sorted Sets

14. Save to disk

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

16. What about node?!

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

18. Use case #1:
Caching

19. 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.
});
};

20. Use case #2:
Session store

21. 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

22. Use case #3:
Pub/Sub

23. Chat Chat
Server Server
Load
Balancer

24. Use case #4:
Job Queue

25. i.e.:
Image resize API

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

27. orker Job
Resize
Queue
Workers
1) Download image Node
2) Resize image with GD
Server
GET /image_resize?url=http://...

28. Kue
https://github.com/learnboost/kue

29. There's a lot more!
11 Common Web Use Cases Solved in Redis
http://bit.ly/pgDmXn

30. Questions? :)