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https://issues.apache.org/jira/browse/CASSANDRA-9526?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14571381#comment-14571381
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Ron Kuris commented on CASSANDRA-9526:
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Blog post with related info: http://hackers.lookout.com/2015/06/cassandra-phi/
> Provide a JMX hook to monitor phi values in the FailureDetector
> ---------------------------------------------------------------
>
> Key: CASSANDRA-9526
> URL: https://issues.apache.org/jira/browse/CASSANDRA-9526
> Project: Cassandra
> Issue Type: Improvement
> Components: Core
> Reporter: Ron Kuris
> Fix For: 2.0.x
>
> Attachments: Monitor-Phi-JMX.patch.txt,
> PHI-Log-Debug-When-Close.patch.txt, PHI-Race-Condition.patch.txt
>
>
> phi_convict_threshold can be tuned, but there's currently no way to monitor
> the phi values to see if you're getting close.
> The attached patch adds the ability to get these values via JMX.
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