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https://issues.apache.org/jira/browse/HDFS-15974?focusedWorklogId=584316&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-584316
 ]

ASF GitHub Bot logged work on HDFS-15974:
-----------------------------------------

                Author: ASF GitHub Bot
            Created on: 16/Apr/21 15:40
            Start Date: 16/Apr/21 15:40
    Worklog Time Spent: 10m 
      Work Description: goiri commented on a change in pull request #2915:
URL: https://github.com/apache/hadoop/pull/2915#discussion_r614937252



##########
File path: 
hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/metrics/NamenodeBeanMetrics.java
##########
@@ -855,7 +855,7 @@ public long getNumberOfSnapshottableDirs() {
 
   @Override
   public String getEnteringMaintenanceNodes() {
-    return "N/A";
+    return null;

Review comment:
       Can we add a test?
   I don't think we can reproduce the JSON parsing in the browser side but 
let's do something closer.




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Issue Time Tracking
-------------------

    Worklog Id:     (was: 584316)
    Time Spent: 20m  (was: 10m)

> 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
>              Labels: pull-request-available
>         Attachments: HDFS-15358-1.patch, image-2021-04-15-11-36-47-644.png
>
>          Time Spent: 20m
>  Remaining Estimate: 0h
>
> Clicking the Datanodes tag on the Router UI does not respond.



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