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From "Brandon Williams (JIRA)" <>
Subject [jira] Updated: (CASSANDRA-610) Gossip conviction threshold too low
Date Tue, 08 Dec 2009 02:17:18 GMT


Brandon Williams updated CASSANDRA-610:

    Attachment: 610.patch

> Gossip conviction threshold too low
> -----------------------------------
>                 Key: CASSANDRA-610
>                 URL:
>             Project: Cassandra
>          Issue Type: Bug
>         Environment: debian lenny amd 64 OpenJDK 64-Bit Server VM (build 1.6.0_0-b11,
mixed mode)
>            Reporter: Brandon Williams
>            Assignee: Brandon Williams
>             Fix For: 0.5
>         Attachments: 610.patch
> The current gossip conviction threshold is a bit too low, and can cause hosts to 'flap'
under heavy load.  I suspect that the original author of the failure detector implementation
originally used both suspect and convict, but at some point decided that there was no action
to take when a host was suspected, or that it was not worth doing.  They appear to have short-circuited
the code to convict on suspect to eliminate this, however this caused the suspicion threshold
(5) to be used for convicting hosts instead of the conviction threshold (8).

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