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Posted to commits@cassandra.apache.org by "Kévin LOVATO (JIRA)" <ji...@apache.org> on 2016/11/09 16:36:58 UTC

[jira] [Updated] (CASSANDRA-12876) Negative mean write latency

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

Kévin LOVATO updated CASSANDRA-12876:
-------------------------------------
    Attachment: negative_mean_details.PNG

A zoom on the 30 minutes disturbance.

> 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: 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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