We support several cassandra versions and we have a branch for each.
master is usually synched to one of the versions but should only be used by hector developers since it changes fast.
Hector version scheme looks like this:
0.6.0 means cassandra version 0.6.0
-9 means hector version 9.
So if you’d like to work with cassandra 0.6.0 either use git to fetch the latest from http://github.com/rantav/hector/tree/0.6.0 or visit the downloads page and search your version