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Are they still using Coral and Codigo as the RPC stack?

Yeah Amazon still runs on Coral, there were some recent (release a few years ago) advances on it under the hood and ergonomically. I think the "replacement" for it is Smithy[0] though it will likely just replace the XML schema and codegen and not the protocol. Honestly at this point I think it would be in Amazon's best interest to heavily invest in Java Project Loom rather than trying to convert to async.

[0] https://awslabs.github.io/smithy/

Not Codigo, but Coral, yes.

Well, there's still codigo around, but coral is quite pleasent

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