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Which of the following language is used to build a message server queue in twitter?

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Which of the following language is used to build a message server queue in twitter?

(a) Ruby

(b) Scala

(c) Java

(d) All of the mentioned

The question was posed to me during an online interview.

The origin of the question is Communicating with the Cloud in division Cloud Communication, Media and Streaming of Cloud Computing

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Correct answer is (b) Scala

To explain I would say: The Twitter Web client was built using Ruby on Rails and deployed on the Ruby Enterprise Edition, with the message queue server written in Scala.

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