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From Per Otterström (JIRA) <j...@apache.org>
Subject [jira] [Updated] (CASSANDRA-12876) Negative mean write latency
Date Thu, 10 Nov 2016 20:51:58 GMT

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

Per Otterström updated CASSANDRA-12876:
---------------------------------------
    Attachment: 12876-2.2.txt

> 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
>         Attachments: 12876-2.2.txt, negative_mean.png, negative_mean_details.PNG, negative_mean_periodicity.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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