Concurrent Mark Sweep taking 12 seconds

[Héctor Izquierdo Seliva]

Hi everyone. I see in the logs that Concurrent Mark Sweep is taking 12
seconds to do its stuff. Is this normal? There is no stop-the-world GC,
it just takes 12 seconds.

Configuration: 0.7.5 , 8GB Heap, 16GB machines. 7 * 64 MB memtables.