Nice email Dan.
I would also add if you are still in the initial stages take a look at
Hadoop+Pig. If your source data is write once read many it may be a better fit,
but then you would also need to calculate the aggregates and store them
somewhere.
So Cassandra *may* be just what you want. T
Perhaps other, more experienced and reputable contributors to this list can
comment but to be frank: Cassandra is probably not for you (at least for now).
I personally feel Cassandra is one of the stronger NoSQL options out there and
has the potential to become the defacto standard; but its not
