Tombstone is a marker indicating the record to be deleted.

"gc_grace_seconds" is the time after which the record will be deleted physically from the node. 

There is no ad-hoc way of gc'ing tombstones. Only after "gc_grace_seconds" the tombstones will be gc'ed.

Jahangir Mohammed.

On Thu, Dec 1, 2011 at 2:01 PM, A J <> wrote:
Is 'garbage collecting tombstones ' a different operation than the JVM GC.
Garbage collecting tombstones is controlled by gc_grace_seconds which
by default is set to 10 days. But the traditional GC seems to happen
much more frequently (when observed through jconsole) ?

How can I force the garbage collecting tombstones to happen ad-hoc
when I want to ?