One day, this will hold Thrax documentation, including how to use Thrax, how to do grammar filtering, and details on the configuration file options. It will also include details about our experience setting up and maintaining Hadoop cluster installations, knowledge wrought of hard-fought sweat and tears.
In the meantime, please bother Jonny Weese if there is something you need to do that you don't understand. You might also be able to dig up some information on the old Thrax page.