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Date: Fri, 9 Dec 2016 20:07:58 +0000 (UTC)
From: "Jay Zhuang (JIRA)" <jira@apache.org>
To: commits@cassandra.apache.org
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Subject: [jira] [Comment Edited] (CASSANDRA-12676) Message coalescing
 regression
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archived-at: Fri, 09 Dec 2016 20:08:00 -0000


    [ https://issues.apache.org/jira/browse/CASSANDRA-12676?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15736131#comment-15736131 ] 

Jay Zhuang edited comment on CASSANDRA-12676 at 12/9/16 8:07 PM:
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[~dikanggu] Read latency has similar impact, here is latency metrics from one of our cluster (P99): !coalescing_disabled.png!


was (Author: jay.zhuang):
[~dikanggu] Read latency has similar impact, here is latency metrics from one of our cluster: !coalescing_disabled.png!

> 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: 4.0, 3.x
>
>         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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