Please refer to the below links that would help you in establishing connectivity between Hadoop and OBIEE
Link : http://www.askjohnobiee.com/2013/06/how-to-hadoop-integration-with-obiee-11g.html
Link : http://www.slideshare.net/rittmanmead/obiee-hadoop-and-big-data-analysis-odtug-kscope14
Please feel free to revert if you need any further help.