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From Per Otterström (JIRA) <j...@apache.org>
Subject [jira] [Updated] (CASSANDRA-12876) Negative mean write latency
Date Wed, 18 Jan 2017 14:27:26 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-12876?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Per Otterström updated CASSANDRA-12876:
---------------------------------------
    Fix Version/s:     (was: 2.2.9)
                   4.x
                   3.x
                   3.0.x
                   2.2.x

> 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.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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