http://www.reddit.com/r/IAmA/comments/1nz34x/i_built_the_worlds_tiniest_hadoop_testbed_ama

Come join the conversation over on Reddit for an AMA about a tiny (500MB) Hadoop testbed single-node cluster I built for iTnews.com.au and what you can do with it. You can built it yourself from the instructions or down load a pre-built one if you prefer.