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From "Wangda Tan (JIRA)" <j...@apache.org>
Subject [jira] [Created] (YARN-2124) ProportionalCapacityPreemptionPolicy cannot work because it's initialized before scheduler initialized
Date Thu, 05 Jun 2014 07:45:02 GMT
Wangda Tan created YARN-2124:
--------------------------------

             Summary: 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


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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