18. • First line of code written in 2004
• Shopify released June, 2006
• Same codebase
• Over 9 years of Rails upgrades, improvements and changes
Looking Back, to Look Ahead
19. Looking Back, to Look Ahead
• 6,702 Lines of application code (55,873)
• 4,386 Lines of test code (81,892)
• 38 Controllers (211)
• 77 Models (468)
20. Looking Back, to Look Ahead
• Ruby 1.8.2
• Rails 0.13.1
• MySQL 4.1
• Lighttpd
• Memcached
38. cacheable
class PostsController < ApplicationController
def show
response_cache do
@post = @shop.posts.find(params[:id])
respond_with(@post)
end
end
def cache_key_data
{
:action => action_name,
:format => request.format,
:params => params.slice(:id),
:shop_version => @shop.version
}
end
end
45. Delayed Job
• Jobs stored in the db
• Workers run in their own process
• Workers poll for jobs periodically
• https://github.com/collectiveidea/delayed_job
46. Resque
• Redis backed
• O(1) operation to pop jobs
• Faster (300 jobs/sec vs 120 jobs/sec)
• Extensible
• https://github.com/defunkt/resque
57. after_commit
class OrderObserver < ActiveRecord::Observer
observe :order
def after_save(order)
if order.changes.keys.include?(:financial_status)
order.flag_for_after_commit(:update_customer)
end
end
def after_commit(order)
if order.flagged_for_after_commit?(:update_customer)
Resque.enqueue(UpdateCustomerJob, :id => order.id)
end
end
end
59. Services
• Split out standalone services as needed
• Independently scaled
• Segmented metrics
• Overall system is more complex
• Limit to what is necessary
61. Adapt and Evolve as Needed
Using data and knowledge of the system to drive decisions
62. Summary
• Know your application and infrastructure.
• Keep slow IO or CPU tasks out of the main process.
• Measure your optimizations. You can make it worse.
