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From "Yi Deng (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-12133) Add FastLongHistogram for metric computation
Date Wed, 01 Oct 2014 17:50:34 GMT

    [ https://issues.apache.org/jira/browse/HBASE-12133?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14155190#comment-14155190
] 

Yi Deng commented on HBASE-12133:
---------------------------------

Thanks [~eclark] for the like.

`UniformReservoir` and `ExponentiallyDecayingReservoir` are similar to corresponding classes
in yammer. `SlidingWindowReservoir` is synchronized.

> Add FastLongHistogram for metric computation
> --------------------------------------------
>
>                 Key: HBASE-12133
>                 URL: https://issues.apache.org/jira/browse/HBASE-12133
>             Project: HBase
>          Issue Type: New Feature
>          Components: metrics
>    Affects Versions: 0.98.8
>            Reporter: Yi Deng
>            Assignee: Yi Deng
>            Priority: Minor
>              Labels: histogram, metrics
>             Fix For: 0.98.8
>
>         Attachments: 0001-Add-FastLongHistogram-for-fast-histogram-estimation.patch,
0001-Add-FastLongHistogram-for-fast-histogram-estimation.patch, 0001-Add-FastLongHistogram-for-fast-histogram-estimation.patch
>
>
> FastLongHistogram is a thread-safe class that estimate distribution of data and computes
the quantiles. It's useful for computing aggregated metrics like P99/P95.



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