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2017.09.09 Orbit - Seattle Code Camp
- 1. BUILDING HIGH-SCALE DISTRIBUTED SYSTEMS USING ORBIT AND THE VIRTUAL ACTOR MODEL Victor Hurdugaci
- 2. VICTOR HURDUGACI • Romanian • Currently: Electronic Arts, Seattle • Past: Microsoft (ASP.NET, Azure WebJobs/Functions, X++ compiler) • Fell asleep and woke up in a different country • @VictorHurdugaci • http://victorh.info
- 3. INTRODUCTION • Data shipping paradigm • Frontend: stateless • Middle-tier: stateless • Data transfer on every request • No data locality Frontend FrontendFrontendFrontendFrontendFrontend Middle-tierMiddle-tierMiddle-tier Storage
- 4. INTRODUCTION • Data shipping paradigm • Frontend: stateless • Middle-tier: stateless • Data transfer on every request • No data locality • No semantic and concurrency benefits of storage Frontend FrontendFrontendFrontendFrontendFrontend Middle-tierMiddle-tierMiddle-tier Storage Cache
- 5. INTRODUCTION • Function shipping paradigm • Frontend: stateless • Middle-tier: stateful • Performance benefits of cache • Data locality • Semantic and concurrency benefits Frontend FrontendFrontendFrontendFrontendFrontend Middle-tierMiddle-tierMiddle-tier Storage Data Data Data
- 6. Foo myVar = new Foo() … myVar.doSomething(42)
- 7. DEMO - START
- 8. VIRTUAL ACTOR • An actor is a computational entity that, in response to a message it receives, can concurrently: • Send a finite number of messages to other actors • Create a finite number of new actors • Designate the behavior to be used for the next message it receives (change state) -- Wikipedia
- 9. ORBIT • Virtual actor framework • OSS • Java/JVM • Microsoft Orleans but for JVM
- 10. ORBIT VIRTUAL ACTORS • Java classes • Have an identity (type + string)
- 11. ORBIT VIRTUAL ACTORS • Java classes • Have an identity (type + string) • “Single threaded” • Cooperative multitasking • Async
- 12. ORBIT VIRTUAL ACTORS • Java classes • Have an identity (type + string) • “Single threaded” • Cooperative multitasking • Async • Perpetual existence • Actors never fail
- 13. ACTOR LIFECYCLE • No explicit (de)activation • No explicit placement • Activated: on message • Deactivated: on timeout because no message
- 14. ORBIT NODE Server Orbit (java) process Actor Actor Actor Actor
- 15. ORBIT CLUSTER Server Orbit (java) process Actor Actor Actor Actor Actor Server Orbit (java) process Actor Actor Actor Actor Server Orbit (java) process Actor Actor Actor Actor Actor Server Orbit (java) process Actor Actor Actor
- 20. ORBIT MESSAGING Server Server Server Server Client Redis Actor directory Node directory Messaging
- 22. HOST ⇒ CLIENT, CLIENT ⇏ HOST Server/Client Server/Client Server/Client Server/Client Actor directory Node directory Messaging Node directory Actor directory Actor directory Actor directory MessagingMessagingMessagingMessagingMessagingMessaging Messaging Client
- 23. EVENTUAL CONSISTENCY • No failure = single activation guarantee • Failure = single activation eventual guarantee • Two activations in two different partitions • One is eventually dropped • Availability over consistency
- 24. DEMO – ORBIT
- 25. PERSISTENCE • Actor state • No out-of-the-box solution • No checkpoint enforcement • 100% application controlled • Persistence hooks
- 28. DEMO – ORBIT (PERSISTENCE)
- 29. PERFORMANCE CONSIDERATIONS • Small messages, billions of actors • Actor state size • Actor state load time • CPU • Message size
- 30. NO FREE LUNCH • Batch operations • Mix of short and long running operations • Cross-actor transactions
- 31. THANK YOU! • Orbit: https://github.com/orbit/orbit • Orleans: https://github.com/dotnet/orleans • http://victorh.info • @victorhurdugaci