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From "Ryan King (JIRA)" <j...@apache.org>
Subject [jira] Updated: (CASSANDRA-1024) Latency Histograms
Date Wed, 28 Apr 2010 18:55:49 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-1024?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Ryan King updated CASSANDRA-1024:
---------------------------------

    Attachment: 1024.patch

A complete patch. I punted on the percentile calculations for now. Everyone is going to want
to measure their own percentile thresholds (we will even want different ones for different
clusters) and you can easily calculate the percentiles from the histograms.

> Latency Histograms
> ------------------
>
>                 Key: CASSANDRA-1024
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-1024
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Ryan King
>            Assignee: Ryan King
>            Priority: Minor
>         Attachments: 1024.patch
>
>
> In addition to total and recent latency, I would like to keep track of histograms. We
have a way for doing estimated histograms (whose error domain gets worse the higher the latency
and whose storage requirements are constant). It works pretty well for us:
>   http://github.com/robey/ostrich/blob/master/src/main/scala/com/twitter/ostrich/Histogram.scala
> I'm planning on doing the work, but wanted to know if it would be useful to others.

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