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https://issues.apache.org/jira/browse/YARN-8737?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17217279#comment-17217279
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Wangda Tan commented on YARN-8737:
----------------------------------
Rekicked Jenkins, after reviewed the case, the fix looks good to me, even
though it covered a small set of the issues. I agree to move scheduling-related
issues in YARN-10178.
> Race condition in ParentQueue when reinitializing and sorting child queues in
> the meanwhile
> -------------------------------------------------------------------------------------------
>
> Key: YARN-8737
> URL: https://issues.apache.org/jira/browse/YARN-8737
> Project: Hadoop YARN
> Issue Type: Bug
> Components: capacityscheduler
> Affects Versions: 3.3.0, 2.9.3, 3.2.2, 3.1.4
> Reporter: Tao Yang
> Assignee: Tao Yang
> Priority: Critical
> Attachments: YARN-8737.001.patch
>
>
> Administrator raised a update for queues through REST API, in RM parent queue
> is refreshing child queues through calling ParentQueue#reinitialize,
> meanwhile, async-schedule threads is sorting child queues when calling
> ParentQueue#sortAndGetChildrenAllocationIterator. Race condition may happen
> and throw exception as follow because TimSort does not handle the concurrent
> modification of objects it is sorting:
> {noformat}
> 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.ArrayList.sort(ArrayList.java:1454)
> at java.util.Collections.sort(Collections.java:175)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.policy.PriorityUtilizationQueueOrderingPolicy.getAssignmentIterator(PriorityUtilizationQueueOrderingPolicy.java:291)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.ParentQueue.sortAndGetChildrenAllocationIterator(ParentQueue.java:804)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.ParentQueue.assignContainersToChildQueues(ParentQueue.java:817)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.ParentQueue.assignContainers(ParentQueue.java:636)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler.allocateOrReserveNewContainers(CapacityScheduler.java:2494)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler.allocateOrReserveNewContainers(CapacityScheduler.java:2431)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler.allocateContainersOnMultiNodes(CapacityScheduler.java:2588)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler.allocateContainersToNode(CapacityScheduler.java:2676)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler.scheduleBasedOnNodeLabels(CapacityScheduler.java:927)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler$AsyncScheduleThread.run(CapacityScheduler.java:962)
> {noformat}
> I think we can add read-lock for
> ParentQueue#sortAndGetChildrenAllocationIterator to solve this problem, the
> write-lock will be hold when updating child queues in
> ParentQueue#reinitialize.
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