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Posted to commits@cassandra.apache.org by "Aleksandr Ivanov (JIRA)" <ji...@apache.org> on 2016/12/22 12:20:58 UTC

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

    [ https://issues.apache.org/jira/browse/CASSANDRA-12876?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15769926#comment-15769926 ] 

Aleksandr Ivanov commented on CASSANDRA-12876:
----------------------------------------------

Same problem with mean Read Latency on v3.0.9

> 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
>
>
> 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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