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From "T Jake Luciani (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-12676) Message coalescing regression
Date Tue, 20 Sep 2016 18:14:20 GMT
T Jake Luciani created CASSANDRA-12676:
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             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 default.

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 coalescing|http://cstar.datastax.com/graph?command=one_job&stats=9a26b5f2-7f48-11e6-92e7-0256e416528f&metric=op_rate&operation=2_user&smoothing=1&show_aggregates=true&xmin=0&xmax=508.86&ymin=0&ymax=91223]




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