Blake Eggleston created CASSANDRA-13758:

             Summary: Incremental repair sessions shouldn't be deleted if they 
still have sstables
                 Key: CASSANDRA-13758
             Project: Cassandra
          Issue Type: Bug
            Reporter: Blake Eggleston
            Assignee: Blake Eggleston

The incremental session cleanup doesn't verify that there are no remaining 
sstables marked as part of the repair before deleting it. Deleting a successful 
repair session which still has outstanding sstables will cause those sstables 
to be demoted to unrepaired, creating an inconsistency.

This typically wouldn't be an issue, since we'd expect the sstables to long 
since have been promoted / demoted. However, I've seen a few ref leak issues 
which can cause sstables to get stuck. Those have been fixed, but we should 
still protect against that edge case to prevent inconsistencies caused by 
future (or currently unknown) bugs.

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