Failing Gracefully with the Actor Model

Patterns for resiliency using the Actor Model

Transcript

1. Roger Johansson Akka.NET and Proto.Actor Founder Solution Architect - Betsson Group Twitter: @rogeralsing Github: rogeralsing Mail: rogeralsing@gmail.com Github.com/rogeralsing/presentations http://Proto.Actor
2. Dealing with, mitigating and preventing failures. In the small, and at scale.
3. An escalator can never break: it can only become stairs. You should never see an Escalator Temporarily Out Of Order sign, just Escalator Temporarily Stairs. Sorry for the convenience. -Mitch Hedberg
6. Three axioms: Send – an actor can send messages to other actors Create – an actor can create new actors Become – an actor can decide how to handle it’s next message
7. ”An island of consistency in a sea of concurrency” ”Shared nothing”, ”Black box” ”Location transparent”, ”Distributable by design”
8. Implementations: BEAM – Erlang, Elixir, LFE JVM – Akka, Orbit .NET – Akka.NET, Proto.Actor, Microsoft Orleans Go – Proto.Actor
9. Event-driven thread PID Actor State Supervision Children Mailbox Behavior Transport
10. /c2 /b2 /b1 /a1 /a2 /b3 /c3 /c4 /c5 / /c1 /b1
11. Component Consumer 2 Consumer 1
12. Data Access Website Businesslogic
13. Vendor machine Insert coins Gets coffee Me Need more coins
14. Vendor machine Insert coins Out of beans Service guy Refill beans Gets coffee Me
15. Service Request Application error Supervisor Manage failures Response Validation error Client
16. /c2 /b2 /b1 /a1 /a2 /b3 /c3 /c4 /c5 / /c1 OneForOne supervisor AllForOne supervisor /b1 /b3
17. child parent Protect state by delegating work Performs work, can be restarted
19. child parent Attempts Delay
20. DB Actor DB Query DB Result DB Up DB Query DB Error DB Down
21. Idle Active Gated Quarantined
22. Node 2 Node 1 Primary Queue Secondary
23. Queue Hash Slot 1 Hash Slot 2 Hash Slot 3
24. ? ? ? ? Router Worker 1 Worker 2 Worker 3 Fan out Consumer
25. ! ! ! ! Router Worker 1 Worker 2 Worker 3 Return first reply Consumer
26. ! ! ! ! Router Worker 2 Worker 3 Require same reply from at least N workers Consumer Worker 1
28. Add a delay after each message
29. Limit messages per time slice
30. Actor Mailbox
31. Actor Mailbox
32. 1 2 1 2 3 3 4 4 Router Worker 1 Worker 2 Worker 3 Limit concurrent access to a resource
33. Worker 1 Producer Work to be done Send work Worker 2 Work to be done Send work Work Done Work Done
34. Always Exists, Never Fails
37. Node A 433 Node B 24345 Node C 82327 Hash: 989123 Node E 943772 Grain Id: Roger Names: Roger Actors: Roger : User
38. Node A 433 Node B 24345 Node C 82327 Hash: 989123 Node E 943772 Node F 987234 Grain Id: Roger Names: Roger Actors: Roger : User
39. Coordinator
40. The End Roger Johansson Twitter: @rogeralsing Github: rogeralsing Mail: rogeralsing@gmail.com Github.com/rogeralsing/presentations http://Proto.Actor