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From "Aleksandr Ivanov (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CASSANDRA-12876) Negative mean write latency
Date Thu, 22 Dec 2016 12:21:58 GMT

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

Aleksandr Ivanov updated CASSANDRA-12876:
-----------------------------------------
    Attachment: negative_mean_read_latency.png

> 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: 2.2.9
>
>         Attachments: 12876-2.2.txt, negative_mean.png, negative_mean_details.PNG, negative_mean_periodicity.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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