Consistency, that's the usual performance killer.

They have got the hadoop watcher right as well as the BTree/SSTable update mechanisms - heavy import, light update is a use-case that is not catered to usually.

The rest of it feels a lot like memcache (membase/zbase impls) when reading up on its architecture - plus SSDs, that's always going to beats the pants off anything with disks.

Looks good overall, this is probably not for you if want to do exact counters or match up different counters (i.e +1,+1,+1 for a counter funnel).

If you don't need updates to be consistent, like if you imported hadoop data in without modification, this starts to look like a really good model.

When I was using it, it felt too good to be true! :) It's got a lot of moving parts and internal integrations, however, so it's got to be a ton of work to make open. Still hopeful though.