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From "Ariel Weisberg (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-9526) Provide a JMX hook to monitor phi values in the FailureDetector
Date Mon, 12 Oct 2015 17:57:06 GMT

    [ 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:
-------------------------------------------

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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