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Conformance checking at MongoDB: Testing that our code matches our TLA+ specs
Testing code fidelity with TLA+ specs at MongoDB. Explore conformance checking experiences and agile modelling in distributed systems.
Since all server processes ran on one machine and communicated over localhost, we didn't worry about clock synchronization: we just merged the three logs, sorting by timestamp. Max wanted to test that the clients and server implement OT correctly, meaning they resolve conflicts the same way, eventually resulting in identical data everywhere. Using the new TLC features announced in the "Validating Traces" paper above, they toiled for months, brought their specs and code into line, found some bugs, and realized the eXtreme Modelling vision.
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