[jira] Updated: (CASSANDRA-1053) Expose setting of phi in the FailureDetector

["Brandon Williams (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CASSANDRA-1053?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Brandon Williams updated CASSANDRA-1053:
----------------------------------------

    Attachment: 1053.txt

Patch to add a PhiConvictThreshold to the config, but leave it commented out with a default of 8.  Also exposed via JMX.

> Expose setting of phi in the FailureDetector
> --------------------------------------------
>
>                 Key: CASSANDRA-1053
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-1053
>             Project: Cassandra
>          Issue Type: Improvement
>    Affects Versions: 0.6
>            Reporter: Brandon Williams
>            Assignee: Brandon Williams
>            Priority: Trivial
>         Attachments: 1053.txt
>
>
> I've seen some users, always on cloud platforms, say that they have problems with hosts flapping in the FD.  GC is not the cause.  I know of at least one production deployment where they are already hacking phi to 10 to get around the flapping problems.
> This is a dangerous thing to expose, however, since giving meaning to the difference of 8 and 10 here is hard to quantify to someone unfamiliar with the inner workings.  Perhaps we can allow setting it in the config, but not specify a default and leave it commented out with a big fat warning.

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