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Date: Sat, 18 Jun 2016 00:44:05 +0000 (UTC)
From: "Kai Sasaki (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Commented] (HDFS-10534) NameNode WebUI should display
 DataNode usage rate with a certain percentile
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    [ https://issues.apache.org/jira/browse/HDFS-10534?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15337348#comment-15337348 ] 

Kai Sasaki commented on HDFS-10534:
-----------------------------------

[~zhz] Thanks for checking! It sounds reasonable. I think we can make percentile configurable like

{code}
<property>
  <name>dfs.namenode.metrics.node-usage.percentile</name>
  <value>0.95</value>
  <description>
    This setting specifies the percentile value of disk usage of data nodes 
    which is sorted in ascending order. Default is 0.95.
  </description>
</property>
{code}

> 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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