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Background Processing In Ruby

Background Processing In Ruby. Khash Sajadi @ khash. Do I need them?. HTTP downloads Image Resizing Search Index Updates Batch Jobs Spam Checks Uploads Provisioning of a Box Sending Emails Throttling Calls Housekeeping Jobs. What’s on the menu?. Delayed Job / Navvy

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Background Processing In Ruby

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  1. Background Processing In Ruby Khash Sajadi @khash

  2. Do I need them? • HTTP downloads • Image Resizing • Search Index Updates • Batch Jobs • Spam Checks • Uploads • Provisioning of a Box • Sending Emails • Throttling Calls • Housekeeping Jobs

  3. What’s on the menu? • Delayed Job / Navvy • Resque / Sidekiq • DIY (EventMachine, CRON, Spawn…) • Hosted Solutions (IronWorker)

  4. Delayed Job / Navvy • ActiveRecord based (Delayed Job) • DB agnostic (Navvy) • Ruby object with Perform method

  5. Delayed Job / Navvy classMyJob < Struct.new(:text, :emails) defperform emails.each { |e| MyMailer.deliver_text_to_email(text, e) } end end Delayed::Job.enqueueMyJob.new( 'loremipsum...', Users.all.collect(&:email) ) rake jobs:work

  6. Resque • Redis backed • Very similar usage to Delayed Job

  7. Resque classArchive @queue = :file_serve defself.perform(repo_id, branch = 'master') repo = Repository.find(repo_id) repo.create_archive(branch) end end Resque.enqueue(Archive, self.id, branch) rake resque:work QUEUE=*

  8. Resque • Resque Scheduler • ResqueWeb

  9. Testing • resque_unit • Delayed Job kill switch

  10. Forking Threads • Resque vs. Sidekiq • MRI < 1.9 and MRI > 1.9 • REE and JRuby

  11. Keep it up • God, Bluepill, upstart • Procfile • Foreman worker: rake rescue:work QUEUE=* scheduler: rake resque:scheduler

  12. Let’s grow • Vertical Scaling (more workers) • Horizontal Scaling (more boxes) • Error / Dead Letter Queues • Auto Scale

  13. Gotcha! • Always use IDs • Beware of serialization • Don’t hog workers • Be stateless / idempotent • Breakup jobs to atomic parts • Beware of concurrency • Logging and exception handling

  14. Beyond Jobs • Use a solid middleware ( RabbitMQ, ActiveMQ, SQS,…) • Transactions • Distributed transactions

  15. Further Reading • Background Jobs in Ruby on Rails http://4loc.wordpress.com/2010/03/10/background-jobs-in-ruby-on-rails/ • Sidekiq vs. Resquehttp://joshrendek.com/2012/11/sidekiq-vs-resque/

  16. Thank you! Khash Sajadi @khash Download the slides at: bit.ly/T9oJNN

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