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https://issues.apache.org/jira/browse/YARN-4235?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14950014#comment-14950014
 ] 

Hudson commented on YARN-4235:
------------------------------

FAILURE: Integrated in Hadoop-Mapreduce-trunk-Java8 #503 (See 
[https://builds.apache.org/job/Hadoop-Mapreduce-trunk-Java8/503/])
YARN-4235. FairScheduler PrimaryGroup does not handle empty groups 
(rohithsharmaks: rev 8f195387a4a4a5a278119bf4c2f15cad61f0e2c7)
* hadoop-yarn-project/CHANGES.txt
* 
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/fair/TestQueuePlacementPolicy.java
* 
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/fair/QueuePlacementRule.java


> 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
>          Components: fairscheduler
>            Reporter: Anubhav Dhoot
>            Assignee: Anubhav Dhoot
>             Fix For: 2.8.0
>
>         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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