Feature Bits at DevOpsDays 2010 US

Latent Code: Lessons Learned Implementing Feature Bits Erik Sowa Lyris Engineering DevOpsDay US 2010

Outline of Talk Business context DevOps: Continuous flow of code to production Latent code: Introducing feature bits Lessons learned

Business Context

Enable Flow: Avoid Big Bangs Photo Credit: USDOE (http://commons.wikimedia.org/wiki/File:Castle_romeo2.jpg)

Deployment Pipeline Photo Credit: Ryan McFarland (http://commons.wikimedia.org/wiki/File:Alaska_Pipeline.jpg )

Continuous Delivery Documented examples: Allspaw, John and Hammond, Paul, 10+ Deploys Per Day: Dev and Ops Cooperation at Flickr http://en.oreilly.com/velocity2009/public/schedule/detail/7641 http://www.slideshare.net/jallspaw/10-deploys-per-day-dev-and-ops-cooperation-at-flickr http://velocityconference.blip.tv/file/2284377/ Humble, Jez and Farley, David, Continuous Delivery (O'Reilly Rough Cuts) What about features you can't build in a day?

Feature Bits: Latent Code Photo Credit: Marcin Wichary (http://commons.wikimedia.org/wiki/File:IMSAI8080_TV11.jpg)

Latent code variants DigitalRiver and ExactTarget "Feature bits" used by Sean G. Ryan and team Flickr Previously cited talk mentions "feature flags" http://en.oreilly.com/velocity2010/public/schedule/detail/14145 Twitter "dynamically controlling features" and "infrastructure" http://nosql.mypopescu.com/post/407159447/cassandra-twitter-an-interview-with- ryan-king Google Experiments Gradual rollout of new features Etc.

Usage at Lyris Introduced August, 2008 ~ 80 active bits by December, 2009 48 active bits in March, 2010 Photo Credit: superde1uxe (http://commons.wikimedia.org/wiki/File:IMSAI8080.jpg)

Lessons Learned Photo Credit: Underwood & Underwood (http://commons.wikimedia.org/wiki/File:Ecuadoran_Students.jpg)

Design Pressure is Good Photo Credit: Tokino (http://commons.wikimedia.org/wiki/File:Air_pressure_gauge.jpg)

Manage the Lifecycle Photo Credit: Pyrothansia (http://commons.wikimedia.org/wiki/File:Life_cycle.jpg)

Maintain Production Quality Code hidden behind feature bits is subject to the same quality requirements as any code Photo Credit: Rjgdoy (http://commons.wikimedia.org/wiki/File:Quality_not_quantity.png)

Default state: Decouple code rolls Photo Credit: Kazumasa Ogawa (http://commons.wikimedia.org/wiki/File:Japanese_Chain_coupler.jpg)

Naming Convention Matters

Do Not Overload Photo Credit: Jonathan Mallard (http://commons.wikimedia.org/wiki/File:Unsafe_transport_of_a_shipping_container_in_Afghanistan.jpg)

Limit the overhead Photo Credit: Henning Klevier (http://commons.wikimedia.org/wiki/File:Fibonacci_%28x%2B1%29%5En.png)

Customer-facing releases

Beta- and Split-Testing Photo Credit: US Navy (http://commons.wikimedia.org/wiki/File:Navy_binoculars.jpg)

For more information Feature Bits Video of longer presentation (LSSC10) http://bit.ly/9m3d3r Paper (LSSC10 proceedings) http://bit.ly/bu8mNo Thanks Rob Loh (implementer and co-author) Me Twitter: @eriksowa Blog: http://eriksowa.wordpress.com LinkedIn: http://www.linkedin.com/in/eriksowa email: erik.sowa@gmail.com, esowa@lyris.com

Feature Bits at DevOpsDays 2010 US

by Erik Sowa

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