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TBH, I am a big fan of actor- and reactor-like programming patterns (also known as Finite State Machines. While you’re not strictly required to use reactors and might be able to get away without them – they DO provide several very substantial benefits.

(Re)Actors, page 4:

Server-Side Architecture. Front-End Servers and Client-Side Random Load Balancing

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Quote: “[about Round-Robin DNS] one of these returned IPs can get cached by a Big Fat DNS server, and then get distributed to many thousands of clients”
Another Quote: “As a rule of thumb, Front-End Servers are a Good Thing™”
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Server-Side MMO Architecture. Naïve, Web-Based, and Classical Deployment Architectures

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Quote: “If you disrupt the game-event-currently-in-progress for more than 0.5-2 minutes, for almost-any synchronous multi-player game you won’t be able to get the same players back, and will need to rollback the game event anyway.”
Another Quote: “However, keep in mind, that all fall-tolerant solutions are complicated, costly, and for the games realm I generally consider them as an over-engineering (even by my standards).”
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Client-Side. Client Architecture Diagram, Threads, and Game Loop

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Quote: “To have a good concurrency model, it is not strictly necessary to program in Erlang”
Another Quote: “Most of developers agree that FSM-based programming is beneficial in the medium- to long-run.”
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Client-Side. On Debugging Distributed Systems, Deterministic Logic, and Finite State Machines

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Quote: “After your logic has failed in production, you can “replay” this inputs-log on your functionally identical in-house system, and the bug will be reproduced at the very same point where it has originally happened.”
Another Quote: “You can implement your Finite State Machine as a deterministic variation of a usual event-driven program”
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