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https://issues.apache.org/jira/browse/CASSANDRA-9526?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14953482#comment-14953482
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Ariel Weisberg commented on CASSANDRA-9526:
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Also looks like I need to modify nodetool to allow reporting on these values.
Now there are a few UI questions as to what this should look like, whether it
should be output by the existing gossipinfo command or be a new one.
It looks like gossipinfo already dumps quite a bit of information about version
of various dimensions of gossip state for each endpoint. Phi values seem kind
of orthogonal to gossip propagation. It makes me think nodetool would benefit
from having a failure detector specific command.
I am going to implement that just to get started on writing a test for this.
It's not a big deal to refactor on review.
> 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: 2.2.x
>
> Attachments: Monitor-Phi-JMX.patch, Phi-Log-Debug-When-Close.patch,
> Tiny-Race-Condition.patch
>
>
> 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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