Hi, 

I've deleted 50% of my data row by row now disk usage of cassandra data is more 
than 80%.

The gc_grace of table was default (10 days), now i set that to 0, although many 
compactions finished but no space reclaimed so far.

How could i force deletion of tombstones in sstables and reclaim the disk used 
by deleted rows?

I'm using cassandra on a single node.
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