title: cleaning up cassandra tombstones from memtable
body: <p>When I delete a row from cassandra and the data still lives in memtable (no SSTable has been created yet), it looks like that deleted row is never getting cleaned up in memtable since the tombstone cleanup is only done by compaction and compaction only applies to SSTables. Is there anyway I can completely cleanup that deleted row from memtable itself, before flushing it to SSTable? Updates are in place but looks like deletes are not.</p>
  
  <p>We are using Cassandra 2.0.8.</p>
  
  <p>Thanks</p>