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Posted to dev@kafka.apache.org by "Swapnil Ghike (JIRA)" <ji...@apache.org> on 2013/03/09 02:25:12 UTC

[jira] [Updated] (KAFKA-798) Use biased histograms instead of uniform histograms in KafkaMetricsGroup

     [ https://issues.apache.org/jira/browse/KAFKA-798?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Swapnil Ghike updated KAFKA-798:
--------------------------------

    Attachment: kafka-798.patch

One word fix.
                
> Use biased histograms instead of uniform histograms in KafkaMetricsGroup
> ------------------------------------------------------------------------
>
>                 Key: KAFKA-798
>                 URL: https://issues.apache.org/jira/browse/KAFKA-798
>             Project: Kafka
>          Issue Type: Bug
>    Affects Versions: 0.8
>            Reporter: Swapnil Ghike
>            Assignee: Swapnil Ghike
>            Priority: Blocker
>              Labels: kafka-0.8, p1
>             Fix For: 0.8
>
>         Attachments: kafka-798.patch
>
>
> A biased histogram produces quantiles which are representative of (roughly) the last five minutes of data. On the other hand, a uniform histogram produces quantiles which are valid for the entirely of the histogram’s lifetime. More discussion at http://metrics.codahale.com/manual/core/#man-core-histograms-uniform

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