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Where is my scalable API?
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Where is my scalable API?


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Presentation corresponding with the talk I did in LARubyConf 2013.

Presentation corresponding with the talk I did in LARubyConf 2013.

Published in: Technology
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  • 1. Helping your customers to cut costs in their web APIs.
  • 2.  16 years in Software Development From S/390 to Android In love with Ruby since 2006 Working in @eljuanchosf Love to dance Tango and play Blues guitar
  • 3.  Set of programming components and standards. Open up your app to the world. Integration!
  • 4.  Mobile social game (iOS & Android) Video upload & encoding JSON API AWS -> EC2/S3
  • 5. Autoscale with
  • 6.  Find a way to cut costs and improve performance. Provide a very easy way to scale the new solution. Maintain all the RoR application functionality, focusing on APIs for the mobile clients. Tight, TIGHT budget.
  • 7.  Inspiration: Draw Something – Goliath Beanstalk Couchbase HAProxy as load balancer. Varnish
  • 8.  Asynchronous (non-blocking) web server framework.  Based on EventMachine  Lightweight  Rack API & middleware support  Very simple yet powerful configuration  Fully async processing  Websockets out of the box  No callbacks!!  Low memory footprint (only 65 KB!)  0.3 ms from top -> bottom! 
  • 9.  Very simple, very fast work queue.  Saves memory (lots of it).  Multiple queues.  Generic interface.  Several Ruby clients to choose from.  Send your Ruby object as a JSON.  Parallel and asynchronous.  Scales VERY easily. 
  • 10.  Ruby implementation of the Reactor Pattern  Highly scalable  Performance optimized  Mature & stable  Eliminates the complexities of threaded network programming.  Active community Examples: Thin & Goliath.
  • 11.  October 1995 by Douglas Schmidt AKA Dispatcher or Notifier Handle requests delivered to an application by one or more clients. Single threaded by definition Separates application logic from the reactor implementation Task switching = no multithreading!
  • 12. {‘’).get.callback { |http| puts http.response }}
  • 13. {|http| second_url = extract_next_url(http.response) {|http2| puts http2.response }}
  • 14. require em-synchrony/em-httphttp = = extract_next_url(http.response)http2 = No callbacks and still asynchronous!!!
  • 15.  ol-implementations
  • 16.  Latest version has no built-in routing system. Ilya Grigorik (Goliath’s creator) suggests to start multiple Goliath servers, each one with one endpoint and use HAProxy or any reverse proxy to route the requests. That’s kind of cumbersome, don’t you think?
  • 17.  Routing was done thru convention over configuration with a little of Ruby’s reflection abilities mixed with some inheritance:  http://server/api/game/CreateGame was redirected to the api/game/create_game.rb controller: class CreateGame < APIController . . . . end
  • 18.  Goliath: add processes or servers and configure them in HAProxy. Couchbase: add servers to the cluster. Done!(we used Scalar to automate this, too)
  • 19.  From ~450 req/s to ~1300 req/s. From 4 to 1 EC2 application servers. Triple performance while reducing costs. Video upload and processing fast and reliable: ~250 jobs/s