Now that Cloudera's Impala is GA, I expect we will see the SQL battle heat up in the Hadoop/NoSQL world. GigaOM did an interview with Cloudera CEO Mike Olson where they compare what they have against the other major Hadoop distros - HortonWorks, MapR, and EMC.  While I think it is still early days, this is worth a read to get an idea of where things are going… http://gigaom.com/2013/04/30/with-impala-now-ga-clouderas-ceo-sizes-up-the-sql-on-hadoop-market/