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Scaling micro services at gilt

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My talk at the inaugural micro services meet-up at the Engine Yard in Dublin! An honest look at how we've landed on our micro-services architecture at Gilt, and the challenges we're facing.

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Scaling micro services at gilt

  1. 1. scaling μ- services at gilt ade@gilt.com Microservices Dublin Meetup, Engine Yard, Dublin 24th Feb 2015 Adrian Trenaman, VP Engineering, Gilt
  2. 2. we source luxury brands and lifestyle goods
  3. 3. we shoot the product in our studios
  4. 4. we receive
  5. 5. we sell every day at noon
  6. 6. stampede
  7. 7. 2007 - ruby-on-rails monolith
  8. 8. 2011: java, scala, loosely-typed services Hidden linkages; buried business logic Monolithic Java App; huge bottleneck for innovation. lots of duplicated code :( teams focused on business lines Large loosely- typed JSON/HTTP services
  9. 9. enter: µ-services “How can we arrange our teams around strategic initiatives? How can we make it fast and easy to get to change to production?”
  10. 10. 2015: micro-services
  11. 11. service growth over time: point of inflexion === scala.
  12. 12. what are all these services doing?
  13. 13. lines of code per service
  14. 14. # source files per service
  15. 15. # running instances per service
  16. 16. from bare-metal... PHX IAD
  17. 17. … to vapour.
  18. 18. lift’n’shift + elastic teams
  19. 19. AWS instance sizing
  20. 20. evolution of architecture and tech organisation
  21. 21. Lessen dependencies between teams: faster code- to-prod Lots of initiatives in parallel Your favourite <tech/language/framework> here We (heart) μ-services Graceful degradation of service Disposable Code: easy to innovate, easy to fail and move on.
  22. 22. six μ-service challenges no one ever said this was gonna be easy
  23. 23. 1. staging We find it hard to maintain staging environments across multiple teams with lots of services. We think TiP is the way to go: invest is automation, use dark canaries in prod.
  24. 24. 2. ownership Who ‘owns’ that service? What happens if that person goes away? We have chosen for teams and departments to own and maintain their services. No throwing this stuff over the fence.
  25. 25. 3. deployment Services need somewhere to live. We’re building tooling over docker and AWS to give elasticity + fast provisioning + service isolation + repeatable, immutable deployment.
  26. 26. 4. lightweight APIs We’ve settled on REST-style APIs. Developing http://apidoc.me. Separate interface from implementation; ‘an AVRO for REST” (Mike Bryzek, CTO) Note: need 'dumb' zero-dependency clients to those APIs.
  27. 27. 5. audit + alerting How do we stay compliant while giving engineers full autonomy in prod? Really smart alerting: http://cavellc.github.io orders[shipTo: US].count.5m == 0
  28. 28. 6. io explosion Each service call begets more service calls; some of which are redundant This is still a worry for us. We currently don’t automatically detect loops.
  29. 29. scaling μ- services at gilt ade@gilt.com Microservices Dublin Meetup, Engine Yard, Dublin 24th Feb 2015 Adrian Trenaman, VP Engineering, Gilt

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