Arvind Nithrakashyap created CASSANDRA-12778:

             Summary: Tombstones not being Deleted when 
only_purge_repaired_tombstones is enabled
                 Key: CASSANDRA-12778
             Project: Cassandra
          Issue Type: Bug
            Reporter: Arvind Nithrakashyap
            Priority: Critical

When we use only_purge_repaired_tombstones for compaction, we noticed that 
tombstones are no longer being deleted.

{noformat}compaction = {'class': 
'only_purge_repaired_tombstones': 'true'}{noformat}

The root cause for this seems to be caused by the fact that repair itself 
issues a flush which in turn leads to a new sstable being created (which is not 
in the repair set). It looks like we do have some old data in this sstable 
because of only tombstones older than that timestamp are getting deleted even 
though many more keys have been repaired. 

Fundamentally it looks like flush and repair can race with each other and with 
leveled compaction, the flush creates a new sstable at level 0 and removes the 
older sstable (the one that is picked for repair). Since repair itself seems to 
issue multiple flushes, the level 0 sstable never gets repaired and hence 
tombstones never get deleted. 

We have already included the fix for CASSANDRA-12703 while testing. 

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