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https://issues.apache.org/jira/browse/YARN-5419?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15389140#comment-15389140
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sandflee commented on YARN-5419:
--------------------------------
enable yarn.scheduler.fair.allow-undeclared-pools, and submit app to
non-exsiting queues (we are using a sls-like client) will help reproduce this
> fair scheduler page couldn't displayed sometimes
> ------------------------------------------------
>
> Key: YARN-5419
> URL: https://issues.apache.org/jira/browse/YARN-5419
> Project: Hadoop YARN
> Issue Type: Bug
> Affects Versions: 2.7.2
> Reporter: sandflee
>
> {noformat}
> Caused by: java.util.ConcurrentModificationException
> at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:901)
> at java.util.ArrayList$Itr.next(ArrayList.java:851)
> at
> org.apache.hadoop.yarn.server.resourcemanager.webapp.dao.FairSchedulerQueueInfo.<init>(FairSchedulerQueueInfo.java:105)
> at
> org.apache.hadoop.yarn.server.resourcemanager.webapp.dao.FairSchedulerInfo.<init>(FairSchedulerInfo.java:47)
> at
> org.apache.hadoop.yarn.server.resourcemanager.webapp.FairSchedulerPage$QueuesBlock.render(FairSchedulerPage.java:159)
> at org.apache.hadoop.yarn.webapp.view.HtmlBlock.render(HtmlBlock.java:69)
> at
> org.apache.hadoop.yarn.webapp.view.HtmlBlock.renderPartial(HtmlBlock.java:79)
> at org.apache.hadoop.yarn.webapp.View.render(View.java:235)
> at
> org.apache.hadoop.yarn.webapp.view.HtmlPage$Page.subView(HtmlPage.java:49)
> at
> org.apache.hadoop.yarn.webapp.hamlet.HamletImpl$EImp._v(HamletImpl.java:117)
> at org.apache.hadoop.yarn.webapp.hamlet.Hamlet$TD._(Hamlet.java:845)
> 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:212)
> at
> org.apache.hadoop.yarn.server.resourcemanager.webapp.RmController.scheduler(RmController.java:88)
> ... 45 more
> {noformat}
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