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What's the big deal about Deterministic Simulation Testing?

And property test this single-threaded version of the distributed system with controlled randomness, all the while injecting faults (fancy term for unhappy path behavior like errors and latency) we might see in the real-world? And it's become more and more popular with startups like FoundationDB, Antithesis, TigerBeetle, Polar Signals, and WarpStream; as well as folks like Tyler Neely and Pekka Enberg, talking about and making use of this technique. Realistically, that would require third-party systems like Antithesis or Hermit(which, don't get excited, is not actively developed and hasn't worked on any interesting program of mine) or rr.

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