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