I'm not terribly familiar with these sorts of storage systems at a low-level, but I definitely noticed some similarities between this and the way Windows Azure Table Storage was designed. Seems they both use the Paxos algorithm which would explain some shared features. [1]

I'm curious to learn more about how the two compare. Mostly because our company uses Table Storage and its been interesting discovering the limits of these large NoSql storage systems.

[1] Table Storage using Paxos - http://bit.ly/hspRbm