That advice is a little out of date, specially in the future world of 0.8 memory management, see

Aaron Morton
Freelance Cassandra Developer

On 6/07/2011, at 5:51 PM, Donna Li <> wrote:


For a rough rule of thumb, Cassandra's internal datastructures will require about memtable_throughput_in_mb * 3 * number of hot CFs + 1G + internal caches.


Why cassandra need so much memory? What is the 1G memory used for?



Best Regards

Donna li