Jon Haddad created CASSANDRA-19973:
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             Summary: Allow TWCS to use UCS within current window
                 Key: CASSANDRA-19973
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-19973
             Project: Cassandra
          Issue Type: Improvement
            Reporter: Jon Haddad


Since TWCS is using STCS within a window, it makes the sstables inelligible for 
zero copy streaming.  That is a bummer, because time series use cases typically 
have denser nodes.  This makes the penalty from using TWCS very impactful when 
adding new nodes. 

We should be able to use UCS for the window so we can get the benefits of ZCS 
when bootstrapping new nodes.



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