Embracing The Imposter
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This document discusses using test doubles called "imposters" to test distributed systems. Imposters act as stand-ins for dependencies to allow injecting faults and testing failure scenarios without relying on the real dependencies. The document provides examples of how imposters can be configured to drop packets, add delays or random payloads to simulate various failure conditions like flakey hardware or network issues. It also mentions future plans to use imposters on the client side to further improve testing of distributed systems.
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Embracing The Imposter
- 4. Over 60M active users
- 5. Over 60M active usersOver 30M songs
- 6. Over 60M active usersOver 30M songs 58 markets
- 8. WE ARE DOING MICROSERVICES FOR YEARS
- 10. Monolith
- 13. Multiple datacenters Thousands of servers Hundreds of services
- 19. LEGACY x2 FUN
- 20. HARDWARE x10 FUN at scale FAILURES
- 21. Actually…
- 23. Test Double
- 24. IMPOSTER
- 25. Imposter
- 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
- 47. Look Ma! No legacy!
- 48. Fault injection
- 49. Crazy neighbour
- 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
- 57. Imposter, but… for client side
- 60. it’s still possible to improve testability
- 62. vsp@spotify.com