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From "Brandon Williams (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-4038) Investigate improving the dynamic snitch with reservoir sampling
Date Mon, 30 Jul 2012 16:45:35 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-4038?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13424990#comment-13424990
] 

Brandon Williams commented on CASSANDRA-4038:
---------------------------------------------

That's a decent percentage increase, but still 0.001ms/request is pretty minuscule.  LGTM,
+1.
                
> Investigate improving the dynamic snitch with reservoir sampling
> ----------------------------------------------------------------
>
>                 Key: CASSANDRA-4038
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-4038
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Brandon Williams
>            Assignee: Pavel Yaskevich
>             Fix For: 1.2
>
>         Attachments: CASSANDRA-4038.patch
>
>
> Dsnitch's UPDATES_PER_INTERVAL and WINDOW_SIZE are chosen somewhat arbitrarily.  A better
fit may be something similar to Metric's ExponentiallyDecayingSample, where more recent information
is weighted heavier than past information, and reservoir sampling would also be an efficient
way of keeping a statistically significant sample rather than refusing updates after UPDATES_PER_INTERVAL
and only keeping WINDOW_SIZE amount.

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