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https://issues.apache.org/jira/browse/MAPREDUCE-5719?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13869800#comment-13869800
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Zhijie Shen commented on MAPREDUCE-5719:
----------------------------------------
The test failure seems to be related to YARN-1041. However, AM container is
supposed to be not null here, because the current is already up to contact
ApplicationMasterService.
The problem may be within the test case itself. Some simplification or
abstraction makes the current attempt doesn't have an associated container
before getting registered with ApplicationMasterService.
> Potential null pointer access in
> AbstractYarnScheduler#getTransferredContainers()
> ---------------------------------------------------------------------------------
>
> Key: MAPREDUCE-5719
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-5719
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Reporter: Ted Yu
> Attachments: mapreduce-5719-v1.txt
>
>
> From https://builds.apache.org/job/Hadoop-Mapreduce-trunk/1666/console :
> {code}
> Tests run: 14, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 63.12 sec
> <<< FAILURE! - in org.apache.hadoop.mapreduce.v2.app.TestRMContainerAllocator
> testCompletedTasksRecalculateSchedule(org.apache.hadoop.mapreduce.v2.app.TestRMContainerAllocator)
> Time elapsed: 2.083 sec <<< ERROR!
> org.apache.hadoop.yarn.exceptions.YarnRuntimeException:
> java.lang.NullPointerException
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.AbstractYarnScheduler.getTransferredContainers(AbstractYarnScheduler.java:50)
> at
> org.apache.hadoop.yarn.server.resourcemanager.ApplicationMasterService.registerApplicationMaster(ApplicationMasterService.java:277)
> at
> org.apache.hadoop.mapreduce.v2.app.rm.RMCommunicator.register(RMCommunicator.java:154)
> at
> org.apache.hadoop.mapreduce.v2.app.TestRMContainerAllocator$MyContainerAllocator.register(TestRMContainerAllocator.java:1476)
> at
> org.apache.hadoop.mapreduce.v2.app.rm.RMCommunicator.serviceStart(RMCommunicator.java:112)
> at
> org.apache.hadoop.mapreduce.v2.app.rm.RMContainerAllocator.serviceStart(RMContainerAllocator.java:219)
> at
> org.apache.hadoop.service.AbstractService.start(AbstractService.java:193)
> at
> org.apache.hadoop.mapreduce.v2.app.TestRMContainerAllocator$MyContainerAllocator.<init>(TestRMContainerAllocator.java:1444)
> at
> org.apache.hadoop.mapreduce.v2.app.TestRMContainerAllocator$RecalculateContainerAllocator.<init>(TestRMContainerAllocator.java:1629)
> at
> org.apache.hadoop.mapreduce.v2.app.TestRMContainerAllocator.testCompletedTasksRecalculateSchedule(TestRMContainerAllocator.java:1665)
> {code}
> In above case getMasterContainer() returned null.
> AbstractYarnScheduler#getTransferredContainers() should check such condition.
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