Sorry, not typing -tcp on linkerd-tcp was completely a typo on my end.

> I think that statement actually refers to Finagle itself being written in Scala, so if you want to use it you have to at least hoist your own apps on the JVM and integrate Finagle in them. Finagle is essentially client-side and requires integration into your app tightly coupling the two.

Thanks, this is the answer I have been looking for.