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https://issues.apache.org/jira/browse/HADOOP-13521?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15428907#comment-15428907
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Elliott Clark commented on HADOOP-13521:
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See HBASE-15222
> SampleQuantile does not perform well under load
> -----------------------------------------------
>
> Key: HADOOP-13521
> URL: https://issues.apache.org/jira/browse/HADOOP-13521
> Project: Hadoop Common
> Issue Type: Bug
> Components: metrics
> Affects Versions: 2.3.0
> Reporter: Mark Wagner
> Attachments: Screen Shot 2015-07-09 at 12.37.29 PM.png
>
>
> After adding quantile collection to one of our clusters we saw much higher
> latency for RPCs. This was traced down to the quantile collection. Samples
> are being buffered and inserted in groups of 500. After the buffered samples
> are inserted, the entire set of samples for this time period (600 seconds at
> the longest for us) is "compressed".
> All operations for RPC metrics are synchronized. Usually this isn't an issue
> but it seems that this compression operation is taking a significant amount
> of time.
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