Kognitio just announced integration with Hadoop.  According to their press release: "an external tables feature will embed a software agent inside Hadoop clusters, effectively leveraging Kognitio as an in-memory analytical accelerator for Hadoop."  I spoke to Roger Gaskell, Kognitio CTO, yesterday at the Hadoop Summit and he said that by using their in-memory technology and coupling that with Hadoop, they are getting SQL and MDX access to their Hadoop data and some amazing query performance.  You can read more here: http://www.kognitio.com/hadoopaccelerator.