Embracing the Imposter

For CodeFest 2015
Talk about making testing doubles work for integration tests in microservice world

1. Embracing the Imposter
2. vsp@spotify.com
4. Over 60M active users
5. Over 60M active users Over 30M songs
6. Over 60M active users Over 30M songs 58 markets
7. SAD STORY TO START WITH
8. WE ARE DOING MICROSERVICES FOR YEARS
9. Microservices 101
10. Monolith
11. Microservices Monolith
13. Multiple datacenters Thousands of servers Hundreds of services
15. Distributed System
16. Distributed System AKA “complicated”
17. Distributed System No reproducibility
18. Distributed System No failure cases for tests
19. LEGACY x2 FUN
20. HARDWARE x10 FUN at scale FAILURES
21. Actually…
23. Test Double
24. IMPOSTER
25. Imposter
26. Imposter Fail miserably
27. Imposter Fail miserably Here you go!
28. Imposter Here you go! Fail in 10 seconds
29. Imposter Cat videos Here you go!
30. Actually…
31. Send A, B and C At rate X For Y time
32. Send A, B and C At rate X For Y time
33. Send A, B and C At rate X For Y time Load Injector
34. Send A, B and C At rate X For Y time Load Injector
35. Some More Steps
36. Add functions like: Drop packets Add hooks to service discovery
37. Add functions like: Drop packets Add pseudo-random delays
38. Add functions like: Drop packets Add pseudo-random payload
39. Add functions like: Drop packets [your function here]
40. Ways to use
46. Legacy dependency!
47. Look Ma! No legacy!
48. Fault injection
49. Crazy neighbour
50. Crazy neighbour Broken hardware
51. Crazy neighbour Broken hardware Cat on a keyboard
52. Crazy neighbour Broken hardware Cat on a keyboard nuke your DC
53. future plans
54. SUT Production
55. SUT Production Imposter
56. Configuration Madness
57. Imposter, but… for client side
59. distributed systems are complicated extremely
60. it’s still possible to improve testability
61. takes effort to do it
62. vsp@spotify.com