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https://issues.apache.org/jira/browse/HDFS-6105?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13935154#comment-13935154
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Kihwal Lee commented on HDFS-6105:
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It was pointed out in HDFS-5748 before.
If you try reloading the page, it won't load multiple time. But if you click on
the "Datanodes" tab, you will see multiple redundant GET being issued. If you
alternate between Overview and Datanodes, it gets worse. After going back and
forth several times, I see it being loaded 9 times when clicking "Datanodes".
> 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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