Failing Gracefully with the actor model
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This document discusses the actor model and how to design systems to fail gracefully. It introduces actors and the core concepts of the actor model including messages, mailboxes, and supervision. It then covers various techniques for mitigating failures like exponential backoff, circuit breakers, and throttling. The document also discusses patterns for distributed systems using actors like load balancing, consistent hashing, and virtual actors.
Failing Gracefully with the actor model
- 1. Failing gracefully With the actor model 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. Design for failure 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
- 5. Actors
- 6. Actor Model 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 its next message
- 7. An island of consistency in a sea of concurrency Shared nothing, Black box Location transparent, Distributable by design Actor Model
- 8. Actor Model Implementations: BEAM Erlang, Elixir, LFE JVM Akka, Orbit .NET Akka.NET, Proto.Actor, Microsoft Orleans Go Proto.Actor
- 10. /c2 /b2/b1 /a1 /a2 /b3 /c3 /c4 /c5 / /c1 /b1
- 13. Vendor machine Insert coins Out of beans Service guy Refill beans Gets coffee Me Need more coinsOut of beans!
- 15. /c2 /b2/b1 /a1 /a2 /b3 /c3 /c4 /c5 / Error Kernel /c1 OneForOne supervisor AllForOne supervisor /b1 /b3
- 16. Let it crash child parent Protect state by delegating work Performs work, can be restarted
- 19. DB Actor DB Query DB Result DB Up DB Query DB Error DB Down Circuit Breaker
- 21. Active Passive Consumers Node 2 Node 1 Primary Queue Secondary
- 22. Consistent Hash Pairs Queue Hash Slot 1 Hash Slot 2 Hash Slot 3
- 23. Fan out and quickest reply ? ? ? ? Router Worker 1 Worker 2 Worker 3 Fan out Consumer
- 24. Fan out and quickest reply ! ! ! ! Router Worker 1 Worker 2 Worker 3 Return first reply Consumer
- 25. N-Modular Redundancy ! ! ! ! Router Worker 2 Worker 3 Require same reply from at least N workers Consumer Worker 1
- 27. Throttling Add a delay after each message
- 28. Throttling Limit messages per time slice
- 31. Limit Concurrency 12 1 2 3 34 4 Router Worker 1 Worker 2 Worker 3 Limit concurrent access to a resource
- 32. Work Pulling Worker 1 Producer Work to be done Send work Worker 2Work to be done Send work Work Done Work Done
- 33. Virtual ActorsAlways Exists, Never Fails
- 35. Virtual Actors
- 36. Node A 433 Node B 24345 Node C 82327 Hash: 989123 Node E 943772 Node D 612344 Node F 987234 Grain Id: Roger Names: Roger Names: Roger Actors: Roger : User Virtual Actors
- 38. The End Roger Johansson Twitter: @rogeralsing Github: rogeralsing Mail: rogeralsing@gmail.com Github.com/rogeralsing/presentations http://Proto.Actor