As far as I can see the main issues are the lack of a range_delete operation and lack of load balancing capability. I can't use Cassandra right now but will continue to evaluate it in the future.
2009/11/6 Ian Holsman <email@example.com>
I was wondering if anyone is thinking of/is using cassandra to power a real time data warehouse.
if so would you consider collaborating/open sourcing the effort so others could join in.