Cassandra – User Grant in Cassandra DB

Cassandra 1.0 uses a minimum of 1MB of heap per CF. So, 1000 or 2000 CFs will be okay for typical heap sizes, but 10000 will probably not be. JVM GC does poorly with very large heaps; I recommend staying under 8GB.

The biggest advantage of the GosspingPropertyFileSnitch is that you can easily migrate your cluster to another cloud without downtime, just by creating a new DC in another cloud, replicate data to that DC and decomission old DC. With provider-specific snitches, such migration may not be possible at all.