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https://issues.apache.org/jira/browse/HDFS-6407?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14635299#comment-14635299
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Nathan Roberts commented on HDFS-6407:
--------------------------------------

My understanding is that the Legacy UI was removed in 2.7. With the legacyUI 
gone, we've lost very valuable functionality. I use the sort capability all of 
the time to do things like: find nodes running different versions during a 
rolling upgrade, evaluate how the balancer is doing by sorting on capacity, 
find very full nodes to see how their disks are performing, sort on Admin state 
to find all decomissioning nodes . I don't think it's a blocker for a release, 
but a loss of commonly used functionality can be very annoying for users.  

> new namenode UI, lost ability to sort columns in datanode tab
> -------------------------------------------------------------
>
>                 Key: HDFS-6407
>                 URL: https://issues.apache.org/jira/browse/HDFS-6407
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: namenode
>    Affects Versions: 2.4.0
>            Reporter: Nathan Roberts
>            Assignee: Benoy Antony
>            Priority: Minor
>              Labels: BB2015-05-TBR
>         Attachments: 002-datanodes-sorted-capacityUsed.png, 
> 002-datanodes.png, 002-filebrowser.png, 002-snapshots.png, 
> HDFS-6407-002.patch, HDFS-6407-003.patch, HDFS-6407.patch, 
> browse_directory.png, datanodes.png, snapshots.png
>
>
> old ui supported clicking on column header to sort on that column. The new ui 
> seems to have dropped this very useful feature.
> There are a few tables in the Namenode UI to display  datanodes information, 
> directory listings and snapshots.
> When there are many items in the tables, it is useful to have ability to sort 
> on the different columns.



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