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Thanks very much for the detailed and thoughtful answers!

I've read before (somewhere, I think) that Dropbox effectively maintains a large internal "standard library" rather than relying on external open source efforts. How much does Magic Pocket rely on Rust's standard library and the crates.io ecosystem? Could you elaborate on how you ended up going in whichever direction you chose with regards to third-party open source code?

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We use 3rd parties for the "obvious" stuff. Like, we're not going to reinvent json serialization. But we typically don't use any 3rd party frameworks on the backend. So things like service management/discovery, rpc, error handling, monitoring, metadata storage, etc etc, are a big in-house stack.

So, we use quite a few crates for the things it makes no sense to specialize in Dropbox-specific ways.

Cool. This might be getting into the weeds a bit, but are you still on rustc-serialize for json or are you trying to keep up with serde/serde_json? If you're using serde, are you on nightly? From your comment above I got the impression that only using stable features was very important, so I'm curious how your codebase implements/derives the serde traits.

We're on rustc-serialize. JSON is not really a part of our data pipeline, just our metrics pipeline. So the performance of the library is not especially critical.

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