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Posted to commits@cassandra.apache.org by "Pavel Yaskevich (JIRA)" <ji...@apache.org> on 2012/07/27 13:18:35 UTC
[jira] [Updated] (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 ]
Pavel Yaskevich updated CASSANDRA-4038:
---------------------------------------
Attachment: CASSANDRA-4038.patch
> 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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