There is some documentation for developers at: http://kafka.apache.org/project
There's also another set of links at the bottom of this wiki page: https://cwiki.apache.org/confluence/display/KAFKA/IndexThere's some minor duplication of information, but it's definitely not quite presented in a clean "step by step" manner.
I think it could benefit from a reorganization of how the information is presented. Before I start making suggestions, does anyone have any thoughts on the subject?
-Ray
