Hello
It's looks that cassandra 1.0.x is stable, and have interesting things like offheap memtables and row cashes, so we want to upgrade to 1.0 version from 0.8. Is it possible to do without cluster downtime (while we upgrade all nodes)? I mean follow: when we begin upgrade at some point in working cluster will be mix of 0.8 (nodes that are not upgraded yet) and 1.0(nodes that already upgraded) so i am concerned about this situation, i.e. communications between nodes can be broken because version communication protocol incompatibilies
