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https://issues.apache.org/jira/browse/HDFS-10534?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15348687#comment-15348687
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Kai Sasaki commented on HDFS-10534:
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Thank you so much [~andrew.wang] and [~zhz] for reviewing!
Histgram sounds good idea which enables us to make own metrics flexibly. But I
think percentile metrics which is provided by NN is also useful because it is
provided through JMX api. This way seems simple access to get node usage
metrics when external system tries to get it.
So I think we can make NN provides percentile metrics here (Of course I'll fix
configuration naming issue) and also implement histogram UI in another JIRA.
What do you think about?
> 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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