This use case seems to be highly read oriented, which is fine, but really diminishes the value of distributed 'nosql' stores. The really hard thing to scale is

This use case seems to be highly read oriented, which is fine, but really diminishes the value of distributed 'nosql' stores. The really hard thing to scale is massive writes. Cassandra's big differentiator, for instance, is it's ability to horizontally scale massively when it comes to writes. a million client writes per second, replicated over zones, type of performance. Oh and by the way, 'vertical' scaling is kind of a silly concept. That just means, "i wasn't an idiot".