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https://issues.apache.org/jira/browse/HDFS-10534?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15353977#comment-15353977
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Kai Sasaki commented on HDFS-10534:
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[~andrew.wang] Thanks for comment.
I think it is possible to calculate the histogram because NN provides UI which
shows the usage of each DN. So I'll try to update a patch to build histogram on
JS side. And also I'll update the title of this JIRA to fit current motivation.
> 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,
> HDFS-10534.03.patch, HDFS-10534.04.patch, HDFS-10534.05.patch, Screen Shot
> 2016-06-23 at 6.25.50 AM.png
>
>
> 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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