T Jake Luciani created CASSANDRA-12676:

             Summary: Message coalescing regression
                 Key: CASSANDRA-12676
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-12676
             Project: Cassandra
          Issue Type: Bug
            Reporter: T Jake Luciani
             Fix For: 2.2.x, 3.0.x

The default in 2.2+ was to enable TIMEHORIZON message coalescing.  After 
reports of performance problems from 2.1 we have discover the issue to be this 

We need to re-test our assumptions on this feature but in the meantime we 
should default back to disabled.

Here is a performance run [with and without message 

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