Dikang Gu created CASSANDRA-12983:

             Summary: NoReplicationTokenAllocator should work with zero 
replication factor as well.
                 Key: CASSANDRA-12983
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-12983
             Project: Cassandra
          Issue Type: Improvement
            Reporter: Dikang Gu
            Assignee: Dikang Gu
             Fix For: 3.12

In our production env, when we expand an existing cluster to a new DC, we are 
doing following steps:
1. set replication factor to be 0 for the new DC.
2. bootstrap all nodes in the new DC.
3. set the replication factor to be 1 and start the rebuild.

I find the NoReplicationTokenAllocator does not work with replication factor 0, 
and this patch will fix it.

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