RailsConf 2008: Friday Early Afternoon

30 May 2008

Dialogue Concerning the Two Chief Modeling Systems

• it’s a Play

(again you should read the slides)

• choosing the right name will make the dev think about this model and give it the right property
• Jim keeps saying we’re skipping layers
• using story cards
• jammed up over reoccurring events
• objects = data + behavior, so you can’t just talk about the data (rows/tables), you must look at behavior
• pull out the Class, Responsibilities, and Collaborator cards
• card only useful for organizing your thoughts not need to fill them all out
• “temporal expressions”
• CJ Date: apparently wrote a lot about data modeling
• Code Smell in Refactoring by Chad Fowler

Flexible Scaling: How to Handle 1 Billion Pageviews – TJ

• WoW: you see all kinds of human behaviors: Mafia, Philantropis
• Building games on Facebook
• He’s the author of Warbook: Rise of the Infernals
• w/i a week he had to fix stuff
• w/i 3 weeks had to rewrite
• started with firebug’s net tab
• look at your logs: pl_analyze
• iostat

• you need tools, but you also need strategies
• don’t need it? ditch it.
• slowing it down? simplify it.
• logging it? stop
• selecting it? cache it.
• memcache
• put sessions in cache
• no-select design
  • use memcache
  • cache_fu already does this
• using ec2
• 1 db box
• 1 memcache box
• 1 static file
• X mongrel boxes
• The Hard Part
  • Scale Everything Else
  • Scale your deploymnet
    • use capistrano
  • Scaling your support
  • community management
    • give them updates every day
• server cost $2000 a month
• you need money
• warbook makes $100,000/month
• 1.5 million users
• 16 million page views

Q&A

• remove transactional saves
• save per fields
• how to solve the persistence problem on ec2? db not on amazon
• which facebook lib? started with rfacebook, facebooker, bebo

Slides

#railsconf2008