Jon Haddad created CASSANDRA-19686:
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             Summary: ALTER should cleanup available_ranges_v2 when removing a 
DC
                 Key: CASSANDRA-19686
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-19686
             Project: Cassandra
          Issue Type: Bug
            Reporter: Jon Haddad


The scenario:

New DC is added

Data is replicated to new DC for keyspace "mykeyspace" via a rebuild

DC is dropped in replication

DC is re-added to "mykeyspace"

When this happens, the user is unable to rebuild as available_ranges_v2 thinks 
it's unnecessary.  

We should remove mykeyspace from system.available_ranges_v2 when removing a DC.

Found in 4.1



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