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by randomsearch 3936 days ago
>The rewrite was from Ruby to Scala

Sorry, you're exactly correct. It was Ruby -> Scala and Java.

To be precise, according to Tony Pritezis from Twitter, Scala is the main language, Java is next, Ruby was still in use in 2014 but migrating away, C/C++ and Python for some specific tasks. He did also talk about some of the problems of using Scala, and I seem to recall someone saying that Scala may be less favoured at Twitter in the future.