Continuous delivery in practice (public)
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Continuous delivery practices were implemented for an RTB project at Kenshoo to allow for faster development and delivery. This included having a single code branch, comprehensive testing at the unit, integration, behavioral, and staging levels, keeping builds stable, ensuring the master branch is always deployable, conducting rigorous code reviews, using real-time feedback, managing upgrades carefully, and A/B testing. It is important to constantly monitor builds and collect feedback to own the process.
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Continuous delivery in practice (public)
- 1. Continuous Delivery In Practice Lessons from Kenshoo’s RTB project
- 2. Who, What, Where Tzach Zohar: ● System Architect ● tzach.zohar@kenshoo.com Kenshoo: ● Founded 2006 ● Online Marketing Technology ● ~450 employees ● 12 World Wide locations
- 3. Continuous Delivery: Why bother? Faster development, delivery and feedback makes our clients and us happier. The “us” alone is worth it.
- 4. Continuous Delivery: Why bother? Better suited product Responsiveness Less waste Higher quality
- 5. Background: RTB Project ● ~1.5 years ● ~4 developers ● ~Dozens of paying clients ● ~50 servers (AWS) ● ~1.5M requests per minute ● ~7ms average response time ● ~99.9% availability ● ~5-10 deployments / week
- 6. How?
- 7. 1. The Obvious ● Single branch ● Full, Fast, Reliable coverage ● Full deployment automation ● Fast feedback ● ABCD - Always Be Continuously Deploying
- 8. ● Unit: complete functional coverage ● Integration: with external systems - thin! ● Behavioral: we use Cucumber ● Staging: verify actual server upgrade 2. Four-Layer Test Suite
- 10. Staging: verify compatibility of new build with other components’ production builds 2. Four-Layer Test Suite
- 11. 3. Keep Builds Stable Do not overlook a test that “sometimes fails”, trusting build status is crucial
- 12. 3. Keep Builds Stable Be Suspicious of: ● Random data tests ● Asynchronous tests ● Integration tests
- 13. 4. Master Is Always Shippable On every commit? Not Quite: Use GitHub Pull Requests “Merge” == Build and Deploy credit: tal.salmona@kenshoo.com
- 14. 5. Rigorous Code Reviews ● Remember “merge” means “deploy”! ● Insist on proper coverage ● Insist on code cleanliness ● Insist on consistent design ● Insist!
- 16. 6. Real-Time Feedback Detect issues immediately and visually
- 17. 7. Keep Upgrade in Mind (1) Use the “Parallel Change” pattern when changing cross-node APIs / Data 1. Write: old Read: both 2. Write: new Read: both 3. Write: new Read: new deploy deploy
- 18. 8. Keep Upgrade in Mind (2) Verify backward compatibility in tests
- 19. 9. A/B Testing Apply new features to a limited user-group Measure business results per-group (Not by branching)
- 20. 10. Own It Constantly check builds Constantly collect feedback Constantly check monitors Answer the phone at 3am
- 21. 10. Own It
- 22. That’s It.
- 23. Appendix A. Partial Tool List Testing: JUnit, Cucumber, Nose Build / CI: Jenkins, Gradle, JaCoCo Code Review: GitHub Provisioning: Puppet Deployment: Fabric, boto Monitoring: Metrics, Graphite
- 24. Appendix B. Are You Ready? Unit Coverage > 90%? Good Staging Tests? Informative Monitors? Builds Are Kept Green? No API Breaking Changes? Rigorous Code Reviews? Support Has Your Phone Number? Do You Own it? Not Ready No Yes credit: tal.salmona@kenshoo.com