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https://issues.apache.org/jira/browse/YARN-2124?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14018573#comment-14018573
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Wangda Tan commented on YARN-2124:
----------------------------------
And I just verified this error is not occurred in 2.4.0.
> ProportionalCapacityPreemptionPolicy cannot work because it's initialized
> before scheduler initialized
> ------------------------------------------------------------------------------------------------------
>
> Key: YARN-2124
> URL: https://issues.apache.org/jira/browse/YARN-2124
> Project: Hadoop YARN
> Issue Type: Bug
> Components: resourcemanager, scheduler
> Affects Versions: 3.0.0
> Reporter: Wangda Tan
> Assignee: Wangda Tan
> Priority: Critical
> Attachments: YARN-2124.patch
>
>
> When I play with scheduler with preemption, I found
> ProportionalCapacityPreemptionPolicy cannot work. NPE will be raised when RM
> start
> {code}
> 2014-06-05 11:01:33,201 ERROR
> org.apache.hadoop.yarn.YarnUncaughtExceptionHandler: Thread
> Thread[SchedulingMonitor (ProportionalCapacityPreemptionPolicy),5,main] threw
> an Exception.
> java.lang.NullPointerException
> at
> org.apache.hadoop.yarn.util.resource.Resources.greaterThan(Resources.java:225)
> at
> org.apache.hadoop.yarn.server.resourcemanager.monitor.capacity.ProportionalCapacityPreemptionPolicy.computeIdealResourceDistribution(ProportionalCapacityPreemptionPolicy.java:302)
> at
> org.apache.hadoop.yarn.server.resourcemanager.monitor.capacity.ProportionalCapacityPreemptionPolicy.recursivelyComputeIdealAssignment(ProportionalCapacityPreemptionPolicy.java:261)
> at
> org.apache.hadoop.yarn.server.resourcemanager.monitor.capacity.ProportionalCapacityPreemptionPolicy.containerBasedPreemptOrKill(ProportionalCapacityPreemptionPolicy.java:198)
> at
> org.apache.hadoop.yarn.server.resourcemanager.monitor.capacity.ProportionalCapacityPreemptionPolicy.editSchedule(ProportionalCapacityPreemptionPolicy.java:174)
> at
> org.apache.hadoop.yarn.server.resourcemanager.monitor.SchedulingMonitor.invokePolicy(SchedulingMonitor.java:72)
> at
> org.apache.hadoop.yarn.server.resourcemanager.monitor.SchedulingMonitor$PreemptionChecker.run(SchedulingMonitor.java:82)
> at java.lang.Thread.run(Thread.java:744)
> {code}
> This is caused by ProportionalCapacityPreemptionPolicy needs
> ResourceCalculator from CapacityScheduler. But
> ProportionalCapacityPreemptionPolicy get initialized before CapacityScheduler
> initialized. So ResourceCalculator will set to null in
> ProportionalCapacityPreemptionPolicy.
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