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https://issues.apache.org/jira/browse/YARN-6092?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15821683#comment-15821683
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Ajith S commented on YARN-6092:
-------------------------------

Hi [~rohithsharma] 
I would like to work on this, will assign to myself, feel free to assign back 
if you have started already

> Refreshing CapacityScheduler page throws NPE
> --------------------------------------------
>
>                 Key: YARN-6092
>                 URL: https://issues.apache.org/jira/browse/YARN-6092
>             Project: Hadoop YARN
>          Issue Type: Bug
>            Reporter: Rohith Sharma K S
>            Assignee: Ajith S
>
> It is observe that RM CapacityScheduler page throw NPE  in RM logs. 
> Application was running and asking for new allocation. 
> {noformat}
> Caused by: java.lang.NullPointerException
>       at 
> org.apache.hadoop.yarn.server.resourcemanager.webapp.CapacitySchedulerPage$HealthBlock.render(CapacitySchedulerPage.java:551)
>       at 
> org.apache.hadoop.yarn.webapp.view.HtmlBlock.render(HtmlBlock.java:69)
>       at 
> org.apache.hadoop.yarn.webapp.view.HtmlBlock.renderPartial(HtmlBlock.java:79)
>       at org.apache.hadoop.yarn.webapp.View.render(View.java:235)
>       at 
> org.apache.hadoop.yarn.webapp.view.HtmlBlock$Block.subView(HtmlBlock.java:43)
>       at org.apache.hadoop.yarn.webapp.hamlet.Hamlet._(Hamlet.java:30354)
>       at 
> org.apache.hadoop.yarn.server.resourcemanager.webapp.CapacitySchedulerPage$QueuesBlock.render(CapacitySchedulerPage.java:471)
> {noformat}



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