nodetool gcstats "GC Reclaimed (MB)" value to high

Question

I have been monitoring gcstats from last couple of days and can't believe the value it return is correct.

nodetool gcstats [GC Reclaimed (MB)] shows below values in last 5 runs when nothing is running against the database

30356680056

663531768

4222674760

567091224

2147418944

The total keyspace size is less than 1 GB.

Answer 1

Thats the result of the java's jvm garbage collection not anything specific to C*. The difference of the garbage collector mbean values: http://docs.oracle.com/javase/7/docs/api/java/lang/management/GarbageCollectorMXBean.html since the last time gcstats was called.