Tao Yang created YARN-8737:
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Summary: 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: 3.2.0
Reporter: Tao Yang
Assignee: Tao Yang
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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