[jira] [Created] (YARN-4235) FairScheduler PrimaryGroup does not handle empty groups returned for a user

["Anubhav Dhoot (JIRA)" <ji...@apache.org>]

Anubhav Dhoot created YARN-4235:
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             Summary: 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


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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