Japan's K-Computer has 705K cores stayed on top of the Top 500 supercomputer list. Now that is scale! I am reacquainting myself to Hadoop to which I was introduced in 2006 and find it is still using stateful nodes maxes out around 3-4K and does not use network storage. Security is an after thought and it is not yet suitable for its killer application interactive behavioral processing or the future killer application real-time stock data processing. If I were to add cloud related requirement of multi-tenancy, virtualization, billing etc etc. you see how underdeveloped this system is and how big its potential is.