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https://issues.apache.org/jira/browse/YARN-8764?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16610566#comment-16610566
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Hu Ziqian commented on YARN-8764:
---------------------------------
hi [~wangda], i find this error in our cluster which based on hadoop-2.8.x. And
i found issue https://issues.apache.org/jira/browse/YARN-5864 has already
reconstruction this part. In YARN-5864, you use threadlocal in
PriorityUtilizationQueueOrderingPolicy. I think we should also use threadlocal
in PartitionedQueueComparator in 2.8.x.
That is just my initial thought. Can you give me some advice?
Thank you.
> Comparison method violates its general contract in Async Schedule
> -----------------------------------------------------------------
>
> Key: YARN-8764
> URL: https://issues.apache.org/jira/browse/YARN-8764
> Project: Hadoop YARN
> Issue Type: Bug
> Components: scheduler
> Affects Versions: 2.8.0
> Reporter: Hu Ziqian
> Priority: Major
> Labels: async-capacity-scheduler
> Attachments: YARN-8764-branch-2.8.4.001.patch
>
>
> We use node label and async schedule in our cluster, and found our rm throw
> many {{IllegalArgumentException which stack is blow:}}
>
> {code:java}
> 2018-09-11 11:59:23,585 ERROR
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler:
> AysncSchedulerThread encounter runtime 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.mergeForceCollapse(TimSort.java:457)
> at java.util.TimSort.sort(TimSort.java:254)
> 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.ParentQueue.sortAndGetChildrenAllocationIterator(ParentQueue.java:685)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.ParentQueue.assignContainersToChildQueues(ParentQueue.java:698)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.ParentQueue.assignContainers(ParentQueue.java:521)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler.allocateOrReserveNewContainers(CapacityScheduler.java:1720)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler.allocateContainerOnSingleNode(CapacityScheduler.java:1715)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler.allocateContainersToNode(CapacityScheduler.java:1806)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler.allocateContainersToNode(CapacityScheduler.java:1446)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler.schedule(CapacityScheduler.java:487)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler$AsyncScheduleThread.run(CapacityScheduler.java:516)
> {code}
> the reason is partitionToLookAt in PartitionedQueueComparator is a string and
> each Async Schedule thread will set it. It cause the compare function in
> PartitionedQueueComparator incorrect and finally casues the
> IllegalArgumentException.
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