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https://issues.apache.org/jira/browse/YARN-6171?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15861703#comment-15861703
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Miklos Szegedi commented on YARN-6171:
--------------------------------------
Based on my analysis the exception occurs, when containers are preempted in the
background:
{code}
Set<ContainerId> preemptionContainerIds = new HashSet<ContainerId>();
for (RMContainer container : application.getPreemptionContainers()) {
preemptionContainerIds.add(container.getContainerId());
}
{code}
> ConcurrentModificationException in ApplicationMasterService.allocate
> --------------------------------------------------------------------
>
> Key: YARN-6171
> URL: https://issues.apache.org/jira/browse/YARN-6171
> Project: Hadoop YARN
> Issue Type: Bug
> Components: fairscheduler
> Affects Versions: 3.0.0-alpha2
> Reporter: Miklos Szegedi
> Assignee: Miklos Szegedi
>
> I have noticed an exception that closes the Application Master occasionally
> with Fair scheduler.
> {code}
> Caused by:
> org.apache.hadoop.ipc.RemoteException(java.util.ConcurrentModificationException):
> java.util.ConcurrentModificationException
> at java.util.HashMap$HashIterator.nextEntry(HashMap.java:922)
> at java.util.HashMap$KeyIterator.next(HashMap.java:956)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FairScheduler.allocate(FairScheduler.java:1005)
> at
> org.apache.hadoop.yarn.server.resourcemanager.ApplicationMasterService.allocate(ApplicationMasterService.java:532)
> at
> org.apache.hadoop.yarn.api.impl.pb.service.ApplicationMasterProtocolPBServiceImpl.allocate(ApplicationMasterProtocolPBServiceImpl.java:60)
> at
> org.apache.hadoop.yarn.proto.ApplicationMasterProtocol$ApplicationMasterProtocolService$2.callBlockingMethod(ApplicationMasterProtocol.java:99)
> at
> org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:617)
> at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:1073)
> {code}
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