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https://issues.apache.org/jira/browse/YARN-192?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13535459#comment-13535459
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Sandy Ryza commented on YARN-192:
---------------------------------
This happens when an application has a reserved container on node 1 with
priority X, and another waiting container with higher priority Y. When node 1
checks in saying that something can now be scheduled on it, the scheduler
expects to find a reservation with priority Y on node 1, but doesn't so NPE's.
> Node update causes NPE in the fair scheduler
> --------------------------------------------
>
> Key: YARN-192
> URL: https://issues.apache.org/jira/browse/YARN-192
> Project: Hadoop YARN
> Issue Type: Bug
> Components: resourcemanager, scheduler
> Affects Versions: 2.0.2-alpha
> Reporter: Sandy Ryza
>
> The exception occurs when unreserve is called on an FSSchedulerApp with a
> NodeId that it does not know about. The RM seems to have a different idea
> about what apps are reserved for which node than the scheduler.
> 2012-10-29 22:30:52,901 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.fair.FSSchedulerApp.unreserve(FSSchedulerApp.java:356)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.AppSchedulable.unreserve(AppSchedulable.java:214)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.AppSchedulable.assignContainer(AppSchedulable.java:266)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.AppSchedulable.assignContainer(AppSchedulable.java:330)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FSQueueSchedulable.assignContainer(FSQueueSchedulable.java:161)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FairScheduler.nodeUpdate(FairScheduler.java:759)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FairScheduler.handle(FairScheduler.java:836)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FairScheduler.handle(FairScheduler.java:1)
> at
> org.apache.hadoop.yarn.server.resourcemanager.ResourceManager$SchedulerEventDispatcher$EventProcessor.run(ResourceManager.java:329)
> at java.lang.Thread.run(Thread.java:662)
> 2012-10-29 22:30:52,903 INFO
> org.apache.hadoop.yarn.server.resourcemanager.ResourceManager: Exiting, bbye..
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