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From "Brandon Williams (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-4038) Investigate improving the dynamic snitch with reservoir sampling
Date Mon, 12 Mar 2012 22:40:40 GMT
Investigate improving the dynamic snitch with reservoir sampling
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                 Key: CASSANDRA-4038
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-4038
             Project: Cassandra
          Issue Type: Improvement
          Components: Core
            Reporter: Brandon Williams
            Assignee: Brandon Williams
             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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