Micro Services

Presentation given at Codeslice event on micro-services.

Transcript

1. μServices { } March 2014 Will Hamill
2. DISCLAIMER: I am not an expert We are working (somewhat) in this direction on some projects But this is based mostly on content from QCon London 2014
3. Applications are getting larger
4. Services are getting smaller
5. Services have been getting smaller for some time
6. Monolithic
7. Layered
8. Service-Oriented
9. Micro-Services
10. How?
11. A micro-service typically does only one thing User Authentication and Role Based Authorisation Service User Authentication Role Based Authorisation
12. Anatomy of a micro service HTTP Logic Monitoring Storage
13. Techs: no hard and fast rules Simpler, lighter, self-contained services need simpler and lighter technologies
15. Why?
16. Simplicity (at the service level)
17. 3,000 LOC vs 200 LOC 100 LOC 500 LOC 400 LOC 200 LOC
18. Scale (distribute load and apps across machines)
19. Scaling the monolith
20. Scaling the monolith
21. Scaling the monolith …
22. Scaling micro-services
23. Scaling micro-services
24. Scaling micro-services
25. Scaling micro-services …
26. Scale 2: Scale Harder (many teams one on project)
27. Division of labour
28. Division of labour
29. Responding to change (decoupling delivery)
30. Release Schedule Every 6 months
31. Every 2 weeks Every week Every 4 weeks About every 4 days
32. Fault tolerance (fault acceptance)
33. Fragile Robust Antifragile
34. Who?
35. Netflix Twitter Amazon Yammer MailOnline
36. Not Quite There Yet
37. BandwagonDB
38. DRY-ed Out “core”
39. Service-Oriented Monolith
40. Difficulties
41. Testing everything is harder (but testing services is easier)
42. Fast, automated deployment and application monitoring are super-important
43. Versioning can be tricky www.semver.org
44. Conway’s Law
45. This Is New
46. This is an emerging approach Find which tradeoffs work best for your particular situation
47. “It depends” ¯\_(ツ)_/¯
48. Further Reading http://www.infoq.com/presentations/Micro-Services http://vimeo.com/user22258446/review/79288222/cbb24b224c http://yobriefca.se/blog/2013/04/29/micro-service-architecture/ http://martinfowler.com/articles/microservices.html http://davidmorgantini.blogspot.co.uk/2013/08/micro-services- introduction.html http://qconlondon.com/dl/qcon-london-2014/slides/ AdrianCockcroft_MigratingToMicroservices.pdf