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Feature Bits at DevOpsDays 2010 US

Ignite talk delivered at DevOpsDays 2010 US (June 15, 2010)

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Feature Bits at DevOpsDays 2010 US

  1. 1. Latent Code: Lessons Learned Implementing Feature Bits Erik Sowa Lyris Engineering DevOpsDay US 2010
  2. 2. Outline of Talk Business context DevOps: Continuous flow of code to production Latent code: Introducing feature bits Lessons learned
  3. 3. Business Context
  4. 4. Enable Flow: Avoid Big Bangs Photo Credit: USDOE (
  5. 5. Deployment Pipeline Photo Credit: Ryan McFarland ( )
  6. 6. Continuous Delivery Documented examples: Allspaw, John and Hammond, Paul, 10+ Deploys Per Day: Dev and Ops Cooperation at Flickr Humble, Jez and Farley, David, Continuous Delivery (O'Reilly Rough Cuts) What about features you can't build in a day?
  7. 7. Feature Bits: Latent Code Photo Credit: Marcin Wichary (
  8. 8. Latent code variants DigitalRiver and ExactTarget "Feature bits" used by Sean G. Ryan and team Flickr Previously cited talk mentions "feature flags" Twitter "dynamically controlling features" and "infrastructure" ryan-king Google Experiments Gradual rollout of new features Etc.
  9. 9. Usage at Lyris Introduced August, 2008 ~ 80 active bits by December, 2009 48 active bits in March, 2010 Photo Credit: superde1uxe (
  10. 10. Lessons Learned Photo Credit: Underwood & Underwood (
  11. 11. Design Pressure is Good Photo Credit: Tokino (
  12. 12. Manage the Lifecycle Photo Credit: Pyrothansia (
  13. 13. Maintain Production Quality Code hidden behind feature bits is subject to the same quality requirements as any code Photo Credit: Rjgdoy (
  14. 14. Default state: Decouple code rolls Photo Credit: Kazumasa Ogawa (
  15. 15. Naming Convention Matters
  16. 16. Do Not Overload Photo Credit: Jonathan Mallard (
  17. 17. Limit the overhead Photo Credit: Henning Klevier (
  18. 18. Customer-facing releases
  19. 19. Beta- and Split-Testing Photo Credit: US Navy (
  20. 20. For more information Feature Bits Video of longer presentation (LSSC10) Paper (LSSC10 proceedings) Thanks Rob Loh (implementer and co-author) Me Twitter: @eriksowa Blog: LinkedIn: email:,