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So, you obviously never worked at Twitter, where they moved from Ruby to Java.

1. The only moved the search 2. A lot of code is in scala not java

1. I never said they moved the entire code base. What would be the point of moving the entire code base anyway? The reason why they moved search to Java is simply because Java scales better than Ruby when faced with heavy traffic.

2. AFAIK, only the message-queue backend is in Scala?

Just wanted to point it out for people who did not know that.

2. Not sure.

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