Have you ever wondered how Amazon does deployments in every 11 seconds? Have you ever wondered how frequently Google Chrome updates? Compare that with an enterprise product you are using or the banking application that you use, it takes weeks or even months for an update. The assumption is that frequent releases are possible for Googles or Amazons or Unicorns. It is not for others. This talk is about why that assumption is wrong. It can be done anywhere, with enough focus and investment for the Continuous Delivery pipeline to make sure that every commit is releasable or deployable. And fundamental to Continuous Delivery is Continuous Integration. Continuous Integration guarantees every change committed to the repository is tested and reported about production readiness. And Feature Toggle is for turning features on/off depending upon certain conditions. This opens the opportunity to test certain features quickly with few users for experimentation and learning. Feature branching has been popular for long, but everyone knows about the “code merge hell”, a common issue because of long-lived branches or infrequent integration. If the team is spending time in fixing the merge hells and checking what part of the code needs to be merged, then it is not the efficient use of human talent.

1. Merge Hells!!
By @leenasn
Feature Toggles to the Rescue

9. Familiar?

12. Building something nobody wants is the ultimate form
of waste
~Eric Ries
The Lean Startup

13. Think about how long would it take you to deliver a
change of one line of code within your application to
production
~Mary and Tom Poppendieck
Lean Software Development, An Agile Toolkit

14. “Continuous Delivery is a software development
discipline where you build software in such a way that
the software can be released to production at any
time.”
http://martinfowler.com/bliki/ContinuousDelivery.html

15. Deployment Pipeline

16. “Continuous integration (CI) is the practice, in
software engineering, of merging all developer
working copies to a shared mainline several times a
day.”

17. Mainline Development

18. Incomplete Features?

19. Feature Toggles

21. Configuration Files

22. ● Deploy != Release
● Avoid Rollback Hells
Release Toggles

23. ● A/B Testing
● Canary Releasing
Experimental Toggles

24. Ops Toggles
● Designing for failure
● Manage Circuit Breakers

25. The Dark Side

27. $$ Question
How to manage it?

28. Expiry Date

29. Story 1

30. http://www.multunus.com/blog/2016/12/continuous-delivery-for-tablet-app-media-company/

31. http://www.multunus.com/blog/2016/12/continuous-delivery-for-tablet-app-media-company/

32. “A longtime dream come true! It is exciting to be able
to educate patients while they wait in the exam room.
This is the future”
~Comment received from a Dr

33. http://www.multunus.com/blog/2016/12/continuous-delivery-for-tablet-app-media-company/

34. Automated the Device
Setup
http://www.multunus.com/blog/2016/12/continuous-delivery-for-tablet-app-media-company/

35. Story 2

36. http://www.multunus.com/blog/2016/12/continuous-delivery-us/

37. Manual + Some Automation

38. http://www.multunus.com/blog/2016/12/continuous-delivery-us/

39. First release of the
product
- Close to 4 million
worth of loans till
date
- An average of 4 loan
officers
http://www.multunus.com/blog/2016/12/continuous-delivery-us/

40. Architecture?

41. https://martinfowler.com/bliki/BranchByAbstraction.html
Branch by Abstraction

42. https://www.martinfowler.com/articles/evodb.html
Database Refactoring

43. https://continuousdelivery.com/implementing/architecture/
Strangler Pattern

44. Summary

46. Work in small batches

47. http://cnmnewz.com/wp-content/uploads/2014/06/Golden-Gate-Bridge-with-Net-AP.jpg

49. Leena S N
@leenasn / leena.sn@multunus.com
https://medium.com/@leenasn

50. http://martinfowler.com/articles/feature-toggles.html
https://continuousdelivery.com/
https://trunkbaseddevelopment.com/
http://www.multunus.com/blog/2016/03/merge-hells-feature-toggles-rescue/
http://www.multunus.com/blog/2013/06/github-workflow-vs-mainline-development/
https://www.youtube.com/watch?v=bbWFCKGhxOs
https://www.youtube.com/watch?v=6Q0mtVnnthQ
https://www.infoq.com/presentations/financial-services-devops
https://www.infoq.com/presentations/CIM-continuous-delivery
https://speakerdeck.com/player/e83684871d5a415d8cf06ea1cec0fd01?feature=oembed
https://www.martinfowler.com/articles/evodb.html
References