[PatrickTulskie]

Maybe I'm reading between the lines here, but the feel of the article was "We got this code base from Summize and it worked great when we got it but now it's full of rot so we scraped it."

Twitter is big on the JVM and they have a bunch of Scala and Java engineers over there so this seems like the natural path. Besides, a lot of the big searching and map reduce frameworks out there are written in Java. This seems like a very natural transition.

The annoying thing is you're going to find a bunch of people who skim the article and start banging the "Rails can't scale" drum louder than they were 3 years ago.