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From "Elliott Clark (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6404) Collect p50, p75 and p95 stats
Date Wed, 18 Jul 2012 17:41:34 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6404?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13417298#comment-13417298

Elliott Clark commented on HBASE-6404:

Only kind of.  HBASE-6261 is talking about replacing our histogram implementation to make
it more accurate.  HBase already has a histogram implementation that works.  HBASE-6261 is
just about accuracy for the 99.95% and 99.995% percentile numbers on extremely skewed distributions.

This seems to be about using a histogram in more places, where we currently use PersistantTimeVaryingRate.
> Collect p50, p75 and p95 stats
> ------------------------------
>                 Key: HBASE-6404
>                 URL: https://issues.apache.org/jira/browse/HBASE-6404
>             Project: HBase
>          Issue Type: Improvement
>          Components: monitoring
>            Reporter: Arjen Roodselaar
>            Assignee: Liyin Tang
> Stats in current versions of HBase are currently exposed as avg, min and max. This gives
a skewed view of performance as the outliers are usually the indicators of problems. Please
revise the stats collection framework to use true buckets and expose the p50, p75 and p95
values of these buckets through JMX.

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