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From "Robert Grandl (JIRA)" <j...@apache.org>
Subject [jira] [Created] (YARN-1444) RM crashes when force reducer to be node local
Date Mon, 25 Nov 2013 20:06:35 GMT
Robert Grandl created YARN-1444:
-----------------------------------

             Summary: RM crashes when force reducer to be node local
                 Key: YARN-1444
                 URL: https://issues.apache.org/jira/browse/YARN-1444
             Project: Hadoop YARN
          Issue Type: Bug
          Components: client, resourcemanager
            Reporter: Robert Grandl
            Priority: Minor


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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