It's a good time for streaming processing infrastructure. Twitter has just released Summingbird, and LinkedIn has released Samza:<p>- <a href="https://blog.twitter.com/2013/streaming-mapreduce-with-summingbird" rel="nofollow">https://blog.twitter.com/2013/streaming-mapreduce-with-summi...</a><p>- <a href="http://samza.incubator.apache.org/" rel="nofollow">http://samza.incubator.apache.org/</a><p>Of the three I'm most interested in Summingbird. Unlike Google's system I can actually download it, and it seems to provide a better query abstraction than Samza. I haven't spent much time investigating any of these systems, so I might be incorrect in this assessment.