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https://issues.apache.org/jira/browse/CASSANDRA-12876?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15862627#comment-15862627
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Chris Lohfink commented on CASSANDRA-12876:
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I actually missed that I was reviewer, I'm testing now.
> 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, 3.11.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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