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> Antithesis has created the holy grail for testing distributed systems: a bespoke hypervisor that deterministically simulates an entire set of Docker containers and injects faults, created by the same people who made FoundationDB.

I remember the Antithesis founder was having a hard time explaining what exactly they did.

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I remember that too, the ambiguity for me was how their fuzzing was good enough to explore an arbitrary state space efficiently enough.

The deterministic hypervisor is 'simple' enough albeit a pretty heavy engineering lift.

One of the cool tricks we can use is that since the testing is all fully deterministic, once we find an interesting point in a test run - even if it is “deep” into the run time wise - our system can start many new branches of test runs off of that moment or moments just prior. So it is much more efficient than having to re-do the work to get to that rare interesting moment for each new branch.

I’m curious if you’re willing and able to share: Are you using FoundationDB as the data store for Antithesis?

We’ll be writing a lot in the near future about how Antithesis works, stay tuned :)

Can’t wait!

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