[jira] [Commented] (CASSANDRA-12676) Message coalescing regression

["Mike Bulman (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-12676?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16129162#comment-16129162 ] 

Mike Bulman commented on CASSANDRA-12676:
-----------------------------------------

Thoughts on removing 3.0.12 from Fix Version, to make life easier for our future selves, since the default was not changed there?  That was my initial assumption before reading all of the comments and confirming through git spelunking

> Message coalescing regression
> -----------------------------
>
>                 Key: CASSANDRA-12676
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-12676
>             Project: Cassandra
>          Issue Type: Bug
>            Reporter: T Jake Luciani
>            Assignee: Jeff Jirsa
>              Labels: docs-impacting
>             Fix For: 3.0.12, 3.11.0, 4.0
>
>         Attachments: 12676.diff, coalescing_disabled.png, result.html
>
>
> The default in 2.2+ was to enable TIMEHORIZON message coalescing.  After reports of performance regressions after upgrading from 2.1 to 2.2/3.0 we have discovered 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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