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From "Jian He (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-2124) ProportionalCapacityPreemptionPolicy cannot work because it's initialized before scheduler initialized
Date Wed, 11 Jun 2014 00:25:01 GMT

    [ https://issues.apache.org/jira/browse/YARN-2124?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14027256#comment-14027256
] 

Jian He commented on YARN-2124:
-------------------------------

I think we can move getRMActiveService from ResourceManager to MockRM at least

> 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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