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Date: Wed, 22 Apr 2015 12:39:00 +0000 (UTC)
From: "gu-chi (JIRA)" <jira@apache.org>
To: yarn-issues@hadoop.apache.org
Message-ID: <JIRA.12727890.1405591317000.74769.1429706340762@Atlassian.JIRA>
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Subject: [jira] [Commented] (YARN-2308) NPE happened when RM restart after
 CapacityScheduler queue configuration changed
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    [ https://issues.apache.org/jira/browse/YARN-2308?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14506991#comment-14506991 ] 

gu-chi commented on YARN-2308:
------------------------------

Hi, Chang Li, as I went through the patches that you attached, previously these was 
+    if (application==null) {
+      LOG.info("can't retireve application attempt");
+      return;
+    }
but, finally, the patch merged does not have this modification. Is this updated on purpose?
What is the concern?
I am now facing one scenario, App status is Finished and AppAttempt status is null, this way when doing recover, application is null in CS and then NPE occur. I am thinking if condition "application==null" was there, the issue I meet will not occur.

> 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
>             Fix For: 2.6.0
>
>         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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