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https://issues.apache.org/jira/browse/YARN-11639?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17810358#comment-17810358
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Ferenc Erdelyi commented on YARN-11639:
---------------------------------------
[~bteke] backport is required for both branch-3.3/3.2 branches and there is no
conflict. Shall I open two separate backport Jira for each branch?
> ConcurrentModificationException and NPE in
> PriorityUtilizationQueueOrderingPolicy
> ---------------------------------------------------------------------------------
>
> Key: YARN-11639
> URL: https://issues.apache.org/jira/browse/YARN-11639
> Project: Hadoop YARN
> Issue Type: Bug
> Components: capacity scheduler
> Reporter: Ferenc Erdelyi
> Assignee: Ferenc Erdelyi
> Priority: Major
> Labels: pull-request-available
>
> When dynamic queue creation is enabled in weight mode and the deletion policy
> coincides with the PriorityQueueResourcesForSorting, RM stops assigning
> resources because of either ConcurrentModificationException or NPE in
> PriorityUtilizationQueueOrderingPolicy.
> Reproduced the NPE issue in Java8 and Java11 environment:
> {code:java}
> ... INFO
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler:
> Removing queue: root.dyn.PmvkMgrEBQppu
> 2024-01-02 17:00:59,399 ERROR
> org.apache.hadoop.yarn.YarnUncaughtExceptionHandler: Thread
> Thread[Thread-11,5,main] threw an Exception.
> java.lang.NullPointerException
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.policy.PriorityUtilizationQueueOrderingPolicy$PriorityQueueResourcesForSorting.<init>(PriorityUtilizationQueueOrderingPolicy.java:225)
> at
> java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:195)
> at
> java.base/java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1654)
> at
> java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484)
> at
> java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474)
> at
> java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:913)
> at
> java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
> at
> java.base/java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:578)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.policy.PriorityUtilizationQueueOrderingPolicy.getAssignmentIterator(PriorityUtilizationQueueOrderingPolicy.java:260)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.ParentQueue.sortAndGetChildrenAllocationIterator(ParentQueue.java:1100)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.ParentQueue.assignContainersToChildQueues(ParentQueue.java:1111)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.ParentQueue.assignContainers(ParentQueue.java:942)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.ParentQueue.assignContainersToChildQueues(ParentQueue.java:1124)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.ParentQueue.assignContainers(ParentQueue.java:942)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler.allocateOrReserveNewContainers(CapacityScheduler.java:1724)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler.allocateContainerOnSingleNode(CapacityScheduler.java:1659)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler.allocateContainersToNode(CapacityScheduler.java:1816)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler.allocateContainersToNode(CapacityScheduler.java:1562)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler.schedule(CapacityScheduler.java:558)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler$AsyncScheduleThread.run(CapacityScheduler.java:605)
> {code}
> Observed the ConcurrentModificationException in Java8 environment, but could
> not reproduce yet:
> {code:java}
> 2023-10-27 02:50:37,584 ERROR
> org.apache.hadoop.yarn.YarnUncaughtExceptionHandler:Thread
> Thread[Thread-15,5, main] threw an Exception.
> java.util.ConcurrentModificationException
> at
> java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1388)
> at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481)
> at
> java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471)
> at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:708)
> at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
> at java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:499)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.policy.PriorityUtilizationQueueOrderingPolicy.getAssignmentIterator(PriorityUtiliza
> ueOrderingPolicy.Java:260)
> {code}
> The immediate (temporary) remedy to keep the cluster going is to restart the
> RM.
> The workaround is to disable the deletion of dynamically created child
> queues.
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