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https://issues.apache.org/jira/browse/HDFS-10534?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15337269#comment-15337269
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Zhe Zhang commented on HDFS-10534:
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Thanks Kai! Patch looks pretty good. However I think we should make the 
percentile configurable (right now fixed at 95). What's your thought?

> NameNode WebUI should display DataNode usage rate with a certain percentile
> ---------------------------------------------------------------------------
>
>                 Key: HDFS-10534
>                 URL: https://issues.apache.org/jira/browse/HDFS-10534
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: namenode, ui
>            Reporter: Zhe Zhang
>            Assignee: Kai Sasaki
>         Attachments: HDFS-10534.01.patch, HDFS-10534.02.patch
>
>
> In addition of *Min/Median/Max*, another meaningful metric for cluster 
> balance is DN usage rate at a certain percentile (e.g. 90 or 95). We should 
> add a config option, and another filed on NN WebUI, to display this.



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