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https://issues.apache.org/jira/browse/HDFS-6105?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13935293#comment-13935293
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Haohui Mai commented on HDFS-6105:
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Every time you click on the datenode tab, it'll reload
{{/jmx?qry=Hadoop:service=NameNode,name=NameNodeInfo}} to get the up-to-date
information of the datanode. This is expected.
> NN web UI for DN list loads the same jmx page multiple times.
> -------------------------------------------------------------
>
> Key: HDFS-6105
> URL: https://issues.apache.org/jira/browse/HDFS-6105
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 2.3.0
> Reporter: Kihwal Lee
>
> When loading "Datanodes" page of the NN web UI, the same jmx query is made
> multiple times. For a big cluster, that's a lot of data and overhead.
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