[jpatokal]

Yup, and from experience, you're going to end up rewriting big chunks of your stack multiple times. (In a previous life, I worked on a team that grew a Java-based SMS gateway from an initial design limit of 10 msg/s on a single box to 10,000+ msg/s sustained, replicated across a high-availability cluster.) Props to the Twitter team for pulling it off, because at volumes like that you start to get into seriously arcane stuff like JVM garbage collection tweaking, or otherwise a full GC that halts all threads of execution for 30+ seconds will create entire pods of fail whales.

http://www.oracle.com/technetwork/java/javase/gc-tuning-6-14...