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From "Brandon Williams (JIRA)" <j...@apache.org>
Subject [jira] Commented: (CASSANDRA-1519) Add threshold to dynamic snitch
Date Wed, 13 Oct 2010 17:55:35 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-1519?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12920690#action_12920690
] 

Brandon Williams commented on CASSANDRA-1519:
---------------------------------------------

1 would mean "use another replica when the pinned one is 100% worse than another".  Zero means
"use another replica when the pinned one is any amount worse than another", which we optimize
to be the original behavior of "sort by score."  I suppose we can allow values > 1, though
I'm not sure how much sense it would make to use such a large value since phi isn't scaling
linearly.

> Add threshold to dynamic snitch
> -------------------------------
>
>                 Key: CASSANDRA-1519
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-1519
>             Project: Cassandra
>          Issue Type: New Feature
>          Components: Core
>    Affects Versions: 0.7.1
>            Reporter: Jonathan Ellis
>            Assignee: Brandon Williams
>            Priority: Minor
>             Fix For: 0.7.0
>
>         Attachments: 1519.txt
>
>
> with CASSANDRA-1314, we'd like to have dynamic snitch route around slow/failing nodes
but not messing with our "pinning" of ranges to nodes unless a threshold of badness is crossed.
 (Threshold should be optional since other snitches pure dynamic corresponds exactly to what
we want.)

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