I'm going to just throw this out here because Druid deserves some love. This may be slightly off topic, but whatever.

I've been working with Druid for over a year now with around five months being in production. The stack plays nicely with Puppet and the APIs are very straight forward.

What really sold me were two things: 1) the ability to have a self hosted ad hoc analytics backend that's on par with SaaS solutions and never have to worry about any aspect of it. I'm a programmer after all... 2) being able to "reindex" or "reaggregate" periods of time very easily using hadoop.

The entire community behind Druid, especially cheddar, deserves a crate of beer :) You've all made my life so much easier.

Here's a direct link to view the paper online in case people don't want to download it: http://static.druid.io/docs/radstack.pdf

Thanks! We updated the link.