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https://issues.apache.org/jira/browse/HDFS-5748?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13875152#comment-13875152
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Haohui Mai commented on HDFS-5748:
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bq. When viewing the datanodes tab, jmx query of 
"Hadoop:service=NameNode,name=NameNodeInfo" is made three times. This was 
already retrieved when dfshealth.html was initially loaded.

I cannot reproduce the behavior. It is intentional to load the JMX multiple 
times to keep things simpler.

bq. A refresh button might help.

The new patch recognizes the URL fragment so you can refresh manually.

bq. Version info was dropped in the datanodes view. This is important for 
rolling upgrades.

Fixed.

bq. Live and dead nodes need to be grouped together.

I believe that they are grouped. Can you elaborate?

bq. Somehow the datanodes table is not populated with this patch.

Fixed.

> Too much information shown in the dfs health page.
> --------------------------------------------------
>
>                 Key: HDFS-5748
>                 URL: https://issues.apache.org/jira/browse/HDFS-5748
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: Kihwal Lee
>            Assignee: Haohui Mai
>         Attachments: HDFS-5748.000.patch, HDFS-5748.001.patch, hdfs-5748.png
>
>
> I've noticed that the node lists are shown in the default name node web page. 
>  This may be fine for small clusters, but for clusters with 1000s of nodes, 
> this is not ideal. The following should be shown on demand. (Some of them 
> have been there even before the recent rework.)
> - Detailed data node information
> - Startup progress
> - Snapshot information



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