Wangda Tan created YARN-7249:
--------------------------------
Summary: Fix CapacityScheduler NPE issue when a container
preempted while the node is being removed
Key: YARN-7249
URL: https://issues.apache.org/jira/browse/YARN-7249
Project: Hadoop YARN
Issue Type: Bug
Affects Versions: 2.8.1
Reporter: Wangda Tan
Assignee: Wangda Tan
Priority: Blocker
This issue could happen when 3 conditions satisfied:
1) A node is removing from scheduler.
2) A container running on the node is being preempted.
3) A rare race condition causes scheduler pass a null node to leaf queue.
Fix of the problem is to add a null node check inside CapacityScheduler.
Stack trace:
{code}
2017-08-31 02:51:24,748 FATAL resourcemanager.ResourceManager
(ResourceManager.java:run(714)) - Error in handling event type
KILL_RESERVED_CONTAINER to the scheduler
java.lang.NullPointerException
at
org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.LeafQueue.completedContainer(LeafQueue.java:1308)
at
org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler.completedContainerInternal(CapacityScheduler.java:1469)
at
org.apache.hadoop.yarn.server.resourcemanager.scheduler.AbstractYarnScheduler.completedContainer(AbstractYarnScheduler.java:497)
at
org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler.killReservedContainer(CapacityScheduler.java:1505)
at
org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler.handle(CapacityScheduler.java:1341)
at
org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler.handle(CapacityScheduler.java:127)
at
org.apache.hadoop.yarn.server.resourcemanager.ResourceManager$SchedulerEventDispatcher$EventProcessor.run(ResourceManager.java:705)
{code}
This is an issue only existed in 2.8.x
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