PlayNice.ly's presentation at the first London Redis Meetup. A quick into to Redis, then digging down into some schema design examples.

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Welcome
(The First) London Redis Meetup
@robbiehudson
@adamcharnock
@bash

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The Agenda
• Quick Redis introduction
• Using Redis to store all our data, hahaha
(Rob & Adam / PlayNice.ly)
• Queuing and non-persistent lists
(Thomas / Mint Digital)
• Super-fast caching and Redis
(Demis / mFlow)
• QA

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Onwards!

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What is Redis?

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What is Redis?
• Advanced key value store
• Data Structure Server (+ more!)
• Lists, Sets, Hashes
(and lots of other cool stuff)
• Super-fast in Memory
• But it is persistent, and now supports VM

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Created by...
Salvatore Sanfilippo (@antirez)
... now VMWare
... and Pieter Noordhuis

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Redis and PlayNice.ly
• PlayNice.ly: Collaboration web app for software developers...
• So, a bug tracker :)
• And we store all our information in Redis
• users, projects, bugs, comments, audit logging, search indexes...

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Redis schema example
• Why you need a schema? ho ho ho

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Users
user:5:name → “Pete Mascot”
user:5:username → “pete”
user:5:email → “pete@playnice.ly”

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Projects
project:9:name → “Alan Parson’s Project”
project:9:created_at → 1274815155
...

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Linking users to projects
user:5:projects → SET(2, 9, 13)
project:9:users → SET(3, 5, 9)

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But that looks like hard work!
• Yes it is, so use a model!

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ORM for Redis
• Ohm: http://ohm.keyvalue.org (Ruby)
• http://github.com/nateware/redis-objects (Ruby)
• http://github.com/whoahbot/dm-redis-adapter (Ruby)
• http://github.com/kijin/stalkr (PHP, “not production ready”)
• Roll your own (like we did, for Python)

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A quick example
>>> user = models.User.create()
>>> user.user_id
6
>>> user.name = "Pete"
>>> user.name
u'Pete'
>>> user.projects
[]

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A quick example
>>> project = models.Project.create()
>>> project.project_id
8
>>> project.users
[]

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A quick example
>>> project.users.add(6)
>>> project.users
[6]
>>> user.projects
[8]

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Proving it actually worked...
>>> redis.get("user:6:name")
'Pete'
>>> redis.smembers("project:8:users")
set(['6'])
>>> redis.smembers("user:6:projects")
set(['8'])

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Summary
• It is very fast!
• Other cool stuff:
• search
• migrations
• message queuing
• PlayNice.ly is entering into Private Beta in the next few
weeks!

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Find out more!
•http://playnice.ly
• http://playnice.ly/blog
• @playnicelyapp

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The Agenda
• Quick Redis introduction
• Using Redis to store all our data, hahaha
(Rob & Adam / PlayNice.ly)
• Queuing and non-persistent lists
(Thomas / Mint Digital)
• Super-fast caching and Redis
(Demis / mFlow)

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Thanks!
Any Questions?