[jira] [Commented] (YARN-5419) fair scheduler page couldn't displayed sometimes

["Weiwei Yang (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/YARN-5419?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15389037#comment-15389037 ] 

Weiwei Yang commented on YARN-5419:
-----------------------------------

Hello [~sandflee]

Looks like FairSchedulerQueueInfo is accessing child queues in an unsafe way. Can you attach the steps to reproduce this issue? I would like to try to reproduce it in-house and see how to get this fixed. Thank you.

> 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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