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From "Tsuyoshi OZAWA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-5719) Potential null pointer access in AbstractYarnScheduler#getTransferredContainers()
Date Fri, 17 Jan 2014 04:52:20 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-5719?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13874430#comment-13874430
] 

Tsuyoshi OZAWA commented on MAPREDUCE-5719:
-------------------------------------------

LGTM!

> 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
>    Affects Versions: 3.0.0, 2.4.0
>            Reporter: Ted Yu
>            Assignee: 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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