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https://issues.apache.org/jira/browse/YARN-10540?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17253003#comment-17253003
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Jim Brennan commented on YARN-10540:
------------------------------------
Trying to figure out why we might get an NPE in this case. One option to avoid
the NPE might be to change SchedulerNode.setNodeUtilization() to check for null
and either set to an empty resource (which is what we initialize it to), or
just ignore the update.
> Node page is broken in YARN UI1 and UI2 including RMWebService api for nodes
> ----------------------------------------------------------------------------
>
> Key: YARN-10540
> URL: https://issues.apache.org/jira/browse/YARN-10540
> Project: Hadoop YARN
> Issue Type: Task
> Components: webapp
> Affects Versions: 3.2.2
> Reporter: Sunil G
> Priority: Critical
> Attachments: Mac-Yarn-UI.png, Screenshot 2020-12-19 at 11.01.43
> PM.png, Screenshot 2020-12-19 at 11.02.14 PM.png, Yarn-UI-Ubuntu.png,
> yarnodes.png, yarnui2onubuntu.png
>
>
> YARN-10450 added changes in NodeInfo class.
> Various exceptions are showing while accessing UI2 and UI1 NODE pages.
> {code:java}
> Caused by: java.lang.NullPointerException
> at
> org.apache.hadoop.yarn.server.resourcemanager.webapp.dao.NodeInfo.<init>(NodeInfo.java:103)
> at
> org.apache.hadoop.yarn.server.resourcemanager.webapp.NodesPage$NodesBlock.render(NodesPage.java:164)
> at
> org.apache.hadoop.yarn.webapp.view.HtmlBlock.render(HtmlBlock.java:69)
> at
> org.apache.hadoop.yarn.webapp.view.HtmlBlock.renderPartial(HtmlBlock.java:79)
> at org.apache.hadoop.yarn.webapp.View.render(View.java:243)
> at
> org.apache.hadoop.yarn.webapp.view.HtmlPage$Page.subView(HtmlPage.java:49)
> at
> org.apache.hadoop.yarn.webapp.hamlet2.HamletImpl$EImp._v(HamletImpl.java:117)
> at org.apache.hadoop.yarn.webapp.hamlet2.Hamlet$TD.__(Hamlet.java:848)
> at
> org.apache.hadoop.yarn.webapp.view.TwoColumnLayout.render(TwoColumnLayout.java:71)
> at
> org.apache.hadoop.yarn.webapp.view.HtmlPage.render(HtmlPage.java:82)
> at
> org.apache.hadoop.yarn.webapp.Controller.render(Controller.java:216)
> at
> org.apache.hadoop.yarn.server.resourcemanager.webapp.RmController.nodes(RmController.java:70)
> {code}
> {code:java}
> 2020-12-19 22:55:54,846 WARN
> org.apache.hadoop.yarn.webapp.GenericExceptionHandler: INTERNAL_SERVER_ERROR
> java.lang.NullPointerException
> at
> org.apache.hadoop.yarn.server.resourcemanager.webapp.dao.NodeInfo.<init>(NodeInfo.java:103)
> at
> org.apache.hadoop.yarn.server.resourcemanager.webapp.RMWebServices.getNodes(RMWebServices.java:450)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:498)
> {code}
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