Funny. I've worked at a place that grew up and moved from Java to Ruby, and I've worked at a place that grew up and moved from Java to Python. I've never worked at a place that moved from anything -to- Java, and I've been in the field since 1994.
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?
