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https://issues.apache.org/jira/browse/YARN-11684?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17840855#comment-17840855
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ASF GitHub Bot commented on YARN-11684:
---------------------------------------
slfan1989 merged PR #6753:
URL: https://github.com/apache/hadoop/pull/6753
> PriorityQueueComparator violates general contract
> -------------------------------------------------
>
> Key: YARN-11684
> URL: https://issues.apache.org/jira/browse/YARN-11684
> Project: Hadoop YARN
> Issue Type: Bug
> Components: capacityscheduler
> Affects Versions: 3.5.0
> Reporter: Tamas Domok
> Assignee: Tamas Domok
> Priority: Major
> Labels: pull-request-available
> Fix For: 3.4.1, 3.5.0
>
>
> YARN-10178 tried to fix the issue but there are still 2 property that might
> change during sorting which causes an exception.
> {code}
> 2024-04-10 12:36:56,420 ERROR
> org.apache.hadoop.yarn.YarnUncaughtExceptionHandler: Thread
> Thread[Thread-28,5,main] threw an Exception.
> java.lang.IllegalArgumentException: Comparison method violates its general
> contract!
> at java.util.TimSort.mergeHi(TimSort.java:899)
> at java.util.TimSort.mergeAt(TimSort.java:516)
> at java.util.TimSort.mergeCollapse(TimSort.java:441)
> at java.util.TimSort.sort(TimSort.java:245)
> at java.util.Arrays.sort(Arrays.java:1512)
> at
> java.util.stream.SortedOps$SizedRefSortingSink.end(SortedOps.java:348)
> at java.util.stream.Sink$ChainedReference.end(Sink.java:258)
> at
> java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:483)
> at
> java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:472)
> at
> java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:708)
> at
> java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
> at
> java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:499)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.policy.PriorityUtilizationQueueOrderingPolicy.getAssignmentIterator(PriorityUtilizationQueueOrderingPolicy.java:260)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.ParentQueue.sortAndGetChildrenAllocationIterator(ParentQueue.java:1100)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.ParentQueue.assignContainersToChildQueues(ParentQueue.java:1111)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.ParentQueue.assignContainers(ParentQueue.java:942)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler.allocateOrReserveNewContainers(CapacityScheduler.java:1719)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler.allocateContainerOnSingleNode(CapacityScheduler.java:1654)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler.allocateContainersToNode(CapacityScheduler.java:1811)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler.allocateContainersToNode(CapacityScheduler.java:1557)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler.schedule(CapacityScheduler.java:539)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler$AsyncScheduleThread.run(CapacityScheduler.java:591)
> {code}
> The `queue.getAccessibleNodeLabels()` and `queue.getPriority()` could change
> in another thread while the `queues` are being sorted. Those should be saved
> when constructing the PriorityQueueResourcesForSorting helper object.
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