azure-cosmos-tla

Microsoft, Amazon, Oracle, Google, all sorts of large companies use them, and talk about it, publicly. They've all published whitepapers and resources about them. Microsoft even employs Dr. Leslie Lamport who created and maintains TLA+ (among other things). Just for some quick examples: Microsoft: https://github.com/Azure/azure-cosmos-tla, https://www.youtube.com/watch?v=kYX6UrY_ooA Google: https://research.google/pubs/specifying-bgp-using-tla/, https://www.researchgate.net/publication/267120559_Formal_Mo... Oracle: https://blogs.oracle.com/cloud-infrastructure/post/sleeping-... (note the author is a "Formal Verification Engineer", it's literally his job at Oracle to do this stuff) Intel: https://dl.acm.org/doi/10.1145/1391469.1391675, https://link.springer.com/chapter/10.1007/978-3-540-69850-0_... Jetbrains: https://lp.jetbrains.com/r

Microsoft built Azure CosmosDB based on TLA+: https://github.com/Azure/azure-cosmos-tla

And here is the Github of their models: https://github.com/Azure/azure-cosmos-tla

The TLA+ specs where eventually published [0], although I wonder how up to date they are to current state of the DB since they haven't been updated for a while. [0] https://github.com/Azure/azure-cosmos-tla

Cosmosdb is Microsoft multi model, multi master, geo database with five consistency levels for performance. https://github.com/Azure/azure-cosmos-tla