Zhe Zhang created HDFS-10534:
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             Summary: 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


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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