Taming Distributed Architecture with Caitie McCaffrey


Distributed systems programming will always be a world of tradeoffs — there is no silver bullet in the future.

But life can be made easier with tactics such as the actor pattern and the use of conflict-free replicated data types (CRDTs).

Caitie McCaffrey is a distributed systems engineer who currently works at Twitter. She previously worked on Halo 4 at Microsoft and 343 Industries.

At QCon San Francisco, she will be hosting the track Taming Distributed Architecture.


  • Describe the service problems on Halo 4 launch day.
  • How did a kill switch help the situation?
  • Why are “implicit assumptions the killer of any distributed system”?
  • Why did you use the actor model to build Halo 4 services?
  • What is a conflict-free replicated data type?


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