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https://issues.apache.org/jira/browse/YARN-1444?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13931900#comment-13931900
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Wangda Tan commented on YARN-1444:
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Thanks [~acmurthy] for reviewing about this.
> RM crashes when node resource request sent without corresponding off-switch
> request
> -----------------------------------------------------------------------------------
>
> Key: YARN-1444
> URL: https://issues.apache.org/jira/browse/YARN-1444
> Project: Hadoop YARN
> Issue Type: Bug
> Components: client, resourcemanager
> Reporter: Robert Grandl
> Assignee: Wangda Tan
> Priority: Blocker
> Fix For: 2.4.0
>
> Attachments: yarn-1444.ver1.patch, yarn-1444.ver2.patch
>
>
> I have tried to force reducers to execute on certain nodes. What I did is I
> changed for reduce tasks, the
> RMContainerRequestor#addResourceRequest(req.priority, ResourceRequest.ANY,
> req.capability) to RMContainerRequestor#addResourceRequest(req.priority,
> HOST_NAME, req.capability).
> However, this change lead to RM crashes when reducers needs to be assigned
> with the following exception:
> FATAL org.apache.hadoop.yarn.server.resourcemanager.ResourceManager: Error in
> handling event type NODE_UPDATE to the scheduler
> java.lang.NullPointerException
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.LeafQueue.assignContainers(LeafQueue.java:841)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.ParentQueue.assignContainersToChildQueues(ParentQueue.java:640)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.ParentQueue.assignContainers(ParentQueue.java:554)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler.nodeUpdate(CapacityScheduler.java:695)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler.handle(CapacityScheduler.java:739)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler.handle(CapacityScheduler.java:86)
> at
> org.apache.hadoop.yarn.server.resourcemanager.ResourceManager$SchedulerEventDispatcher$EventProcessor.run(ResourceManager.java:549)
> at java.lang.Thread.run(Thread.java:722)
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