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https://issues.apache.org/jira/browse/YARN-2308?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14169892#comment-14169892
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Jian He commented on YARN-2308:
-------------------------------
patch looks good to me
> NPE happened when RM restart after CapacityScheduler queue configuration
> changed
> ---------------------------------------------------------------------------------
>
> Key: YARN-2308
> URL: https://issues.apache.org/jira/browse/YARN-2308
> Project: Hadoop YARN
> Issue Type: Bug
> Components: resourcemanager, scheduler
> Affects Versions: 2.6.0
> Reporter: Wangda Tan
> Assignee: chang li
> Priority: Critical
> Attachments: YARN-2308.0.patch, YARN-2308.1.patch, jira2308.patch,
> jira2308.patch, jira2308.patch
>
>
> I encountered a NPE when RM restart
> {code}
> 2014-07-16 07:22:46,957 FATAL
> org.apache.hadoop.yarn.server.resourcemanager.ResourceManager: Error in
> handling event type APP_ATTEMPT_ADDED to the scheduler
> java.lang.NullPointerException
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler.addApplicationAttempt(CapacityScheduler.java:566)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler.handle(CapacityScheduler.java:922)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler.handle(CapacityScheduler.java:98)
> at
> org.apache.hadoop.yarn.server.resourcemanager.ResourceManager$SchedulerEventDispatcher$EventProcessor.run(ResourceManager.java:594)
> at
> org.apache.hadoop.yarn.state.StateMachineFactory.access$300(StateMachineFactory.java:46)
> at
> org.apache.hadoop.yarn.state.StateMachineFactory$InternalStateMachine.doTransition(StateMachineFactory.java:448)
> at
> org.apache.hadoop.yarn.server.resourcemanager.rmapp.RMAppImpl.handle(RMAppImpl.java:654)
> at
> org.apache.hadoop.yarn.server.resourcemanager.rmapp.RMAppImpl.handle(RMAppImpl.java:85)
> at
> org.apache.hadoop.yarn.server.resourcemanager.ResourceManager$ApplicationEventDispatcher.handle(ResourceManager.java:698)
> at
> org.apache.hadoop.yarn.server.resourcemanager.ResourceManager$ApplicationEventDispatcher.handle(ResourceManager.java:682)
> at
> org.apache.hadoop.yarn.event.AsyncDispatcher.dispatch(AsyncDispatcher.java:173)
> at
> org.apache.hadoop.yarn.event.AsyncDispatcher$1.run(AsyncDispatcher.java:106)
> at java.lang.Thread.run(Thread.java:744)
> {code}
> And RM will be failed to restart.
> This is caused by queue configuration changed, I removed some queues and
> added new queues. So when RM restarts, it tries to recover history
> applications, and when any of queues of these applications removed, NPE will
> be raised.
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