I just finished a blog post about how I'm incorporating hadoop streaming into my workflow. http://socio-technologist.blogspot.com/2014/11/fitting-hadoop-streaming-into-my-python.html

TL;DR: I have strong opinions about Good Ways(TM) to process large datafiles in interesting ways and hadoop streaming will support them nicely.  :) 

Props to ottomata for spending a bunch of time helping me get up to speed with our cluster and to gage for making it easier to find hadoop's error messages.  

-Aaron