MapR technologies came out of stealth mode in June, and their solution is available for download.
MapR is the Next Generation for Apache Hadoop
Here is a presentation that you can watch to learn more.
The Design, Scale and Performance of MapR’s Distribution for Apache Hadoop
Check out M.C. Srivas’ Hadoop Summit presentation. Srivas, the CTO and co-founder of MapR, outlines the architectural details behind MapR’s performance advantages. This technical discussion also describes the scale advantages of the MapR distributed NameNode and provides comparisons to HDFS.
Pretty cool you can save 1/2 power for your Apache Hadoop system. Software can save a lot of power to support a green data center.