One caveat: Sector/Sphere is not used by anyone (notable) in the industry. I hope they become a viable alternative to Hadoop as they do have some strong points

One caveat: Sector/Sphere is not used by anyone (notable) in the industry. I hope they become a viable alternative to Hadoop as they do have some strong points on paper. OTOH, an industry maven told me recently that "they don't listen" (to industry feedback), which I hope, is not entirely true.