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Posted to commits@cassandra.apache.org by "Jonathan Ellis (JIRA)" <ji...@apache.org> on 2012/07/04 21:54:34 UTC

[jira] [Assigned] (CASSANDRA-4038) Investigate improving the dynamic snitch with reservoir sampling

     [ https://issues.apache.org/jira/browse/CASSANDRA-4038?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jonathan Ellis reassigned CASSANDRA-4038:
-----------------------------------------

    Assignee: Pavel Yaskevich  (was: Brandon Williams)

Pavel, take a look at this and see if it's worth pursuing.
                
> 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
>
>
> 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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