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https://issues.apache.org/jira/browse/HDFS-15974?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17321881#comment-17321881
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zhu commented on HDFS-15974:
----------------------------

Thank you [~elgoiri]. The function GetEnteringMaintenanceNodes returns " N/A " 
, which will cause the page parsing Json exception . I think this function 
returns null to solve the problem, and my test is exactly that.

*The debug exception is as follows:*

SyntaxError: Unexpected token N in JSON at position 0
 at JSON.parse (<anonymous>)
 at workaround (federationhealth.js:321)
 at Object.<anonymous> (federationhealth.js:398)
 at Object.success (federationhealth.js:504)
 at c (jquery-3.5.1.min.js:2)
 at Object.fireWith [as resolveWith] (jquery-3.5.1.min.js:2)
 at l (jquery-3.5.1.min.js:2)
 at XMLHttpRequest.<anonymous> (jquery-3.5.1.min.js:2)

 

!image-2021-04-15-11-36-47-644.png!

> RBF: Unable to display the datanode UI of the router
> ----------------------------------------------------
>
>                 Key: HDFS-15974
>                 URL: https://issues.apache.org/jira/browse/HDFS-15974
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: rbf, ui
>    Affects Versions: 3.4.0
>            Reporter: zhu
>            Priority: Major
>         Attachments: HDFS-15358-1.patch, image-2021-04-15-11-36-47-644.png
>
>
> Clicking the Datanodes tag on the Router UI does not respond.



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