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From "Tao Yang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-6629) NPE occurred when container allocation proposal is applied but its resource requests are removed before
Date Sat, 12 Aug 2017 13:19:00 GMT

    [ https://issues.apache.org/jira/browse/YARN-6629?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16124569#comment-16124569
] 

Tao Yang commented on YARN-6629:
--------------------------------

Sorry for the late reply. Thanks [~sunilg] for reviewing this issue. Yes, It's happening in
trunk as well. I will write a test case and update the patch later.

> NPE occurred when container allocation proposal is applied but its resource requests
are removed before
> -------------------------------------------------------------------------------------------------------
>
>                 Key: YARN-6629
>                 URL: https://issues.apache.org/jira/browse/YARN-6629
>             Project: Hadoop YARN
>          Issue Type: Bug
>    Affects Versions: 2.9.0, 3.0.0-alpha2
>            Reporter: Tao Yang
>            Assignee: Tao Yang
>         Attachments: YARN-6629.001.patch
>
>
> I wrote a test case to reproduce another problem for branch-2 and found new NPE error,
 log: 
> {code}
> FATAL event.EventDispatcher (EventDispatcher.java:run(75)) - Error in handling event
type NODE_UPDATE to the Event Dispatcher
> java.lang.NullPointerException
>         at org.apache.hadoop.yarn.server.resourcemanager.scheduler.AppSchedulingInfo.allocate(AppSchedulingInfo.java:446)
>         at org.apache.hadoop.yarn.server.resourcemanager.scheduler.common.fica.FiCaSchedulerApp.apply(FiCaSchedulerApp.java:516)
>         at org.apache.hadoop.yarn.client.TestNegativePendingResource$1.answer(TestNegativePendingResource.java:225)
>         at org.mockito.internal.stubbing.StubbedInvocationMatcher.answer(StubbedInvocationMatcher.java:31)
>         at org.mockito.internal.MockHandler.handle(MockHandler.java:97)
>         at org.mockito.internal.creation.MethodInterceptorFilter.intercept(MethodInterceptorFilter.java:47)
>         at org.apache.hadoop.yarn.server.resourcemanager.scheduler.common.fica.FiCaSchedulerApp$$EnhancerByMockitoWithCGLIB$$29eb8afc.apply(<generated>)
>         at org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler.tryCommit(CapacityScheduler.java:2396)
>         at org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler.submitResourceCommitRequest(CapacityScheduler.java:2281)
>         at org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler.allocateOrReserveNewContainers(CapacityScheduler.java:1247)
>         at org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler.allocateContainerOnSingleNode(CapacityScheduler.java:1236)
>         at org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler.allocateContainersToNode(CapacityScheduler.java:1325)
>         at org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler.allocateContainersToNode(CapacityScheduler.java:1112)
>         at org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler.nodeUpdate(CapacityScheduler.java:987)
>         at org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler.handle(CapacityScheduler.java:1367)
>         at org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler.handle(CapacityScheduler.java:143)
>         at org.apache.hadoop.yarn.event.EventDispatcher$EventProcessor.run(EventDispatcher.java:66)
>         at java.lang.Thread.run(Thread.java:745)
> {code}
> Reproduce this error in chronological order:
> 1. AM started and requested 1 container with schedulerRequestKey#1 : 
> ApplicationMasterService#allocate -->  CapacityScheduler#allocate --> SchedulerApplicationAttempt#updateResourceRequests
--> AppSchedulingInfo#updateResourceRequests 
> Added schedulerRequestKey#1 into schedulerKeyToPlacementSets
> 2. Scheduler allocatd 1 container for this request and accepted the proposal
> 3. AM removed this request
> ApplicationMasterService#allocate -->  CapacityScheduler#allocate --> SchedulerApplicationAttempt#updateResourceRequests
--> AppSchedulingInfo#updateResourceRequests --> AppSchedulingInfo#addToPlacementSets
--> AppSchedulingInfo#updatePendingResources
> Removed schedulerRequestKey#1 from schedulerKeyToPlacementSets)
> 4. Scheduler applied this proposal
> CapacityScheduler#tryCommit --> FiCaSchedulerApp#apply --> AppSchedulingInfo#allocate

> Throw NPE when called schedulerKeyToPlacementSets.get(schedulerRequestKey).allocate(schedulerKey,
type, node);



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