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https://issues.apache.org/jira/browse/HBASE-12133?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14155135#comment-14155135
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stack commented on HBASE-12133:
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I just took a look and we actually only use it in a few places. Here is one
http://hbase.apache.org/xref/org/apache/hadoop/hbase/io/hfile/CacheStats.html
Other locations are where we have little perf testing harnesses.
> 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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