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From "Jeff Jirsa (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-12876) Negative mean write latency
Date Sat, 11 Feb 2017 05:30:41 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-12876?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15862229#comment-15862229
] 

Jeff Jirsa commented on CASSANDRA-12876:
----------------------------------------

[~cnlwsu] still on your radar?


> Negative mean write latency
> ---------------------------
>
>                 Key: CASSANDRA-12876
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-12876
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Observability
>            Reporter: Kévin LOVATO
>            Assignee: Per Otterström
>             Fix For: 2.2.x, 3.0.x, 3.11.x, 4.x
>
>         Attachments: 12876-2.2.txt, 12876-2.2-v2.txt, negative_mean_details.PNG, negative_mean_periodicity.PNG,
negative_mean.png, negative_mean_read_latency.png
>
>
> The mean write latency returned by JMX turns negative every 30 minutes. As the attached
screenshots show, the value turns negative every 30 minutes after the startup of the node.
> We did not experience this behavior in 2.1.16.



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