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https://issues.apache.org/jira/browse/YARN-4235?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14948420#comment-14948420
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Rohith Sharma K S commented on YARN-4235:
-----------------------------------------
+1 lgtm
> FairScheduler PrimaryGroup does not handle empty groups returned for a user
> ----------------------------------------------------------------------------
>
> Key: YARN-4235
> URL: https://issues.apache.org/jira/browse/YARN-4235
> Project: Hadoop YARN
> Issue Type: Bug
> Reporter: Anubhav Dhoot
> Assignee: Anubhav Dhoot
> Attachments: YARN-4235.001.patch
>
>
> We see NPE if empty groups are returned for a user. This causes a NPE and
> cause RM to crash as below
> {noformat}
> 2015-09-22 16:51:52,780 FATAL
> org.apache.hadoop.yarn.server.resourcemanager.ResourceManager: Error in
> handling event type APP_ADDED to the scheduler
> java.lang.IndexOutOfBoundsException: Index: 0
> at java.util.Collections$EmptyList.get(Collections.java:3212)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.QueuePlacementRule$PrimaryGroup.getQueueForApp(QueuePlacementRule.java:149)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.QueuePlacementRule.assignAppToQueue(QueuePlacementRule.java:74)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.QueuePlacementPolicy.assignAppToQueue(QueuePlacementPolicy.java:167)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FairScheduler.assignToQueue(FairScheduler.java:689)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FairScheduler.addApplication(FairScheduler.java:595)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FairScheduler.handle(FairScheduler.java:1180)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FairScheduler.handle(FairScheduler.java:111)
> at
> org.apache.hadoop.yarn.server.resourcemanager.ResourceManager$SchedulerEventDispatcher$EventProcessor.run(ResourceManager.java:684)
> at java.lang.Thread.run(Thread.java:745)
> 2015-09-22 16:51:52,797 INFO
> org.apache.hadoop.yarn.server.resourcemanager.ResourceManager: Exiting, bbye..
> {noformat}
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