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https://issues.apache.org/jira/browse/YARN-6171?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15868919#comment-15868919
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Miklos Szegedi commented on YARN-6171:
--------------------------------------
Thank you, [~kasha]. Yes, it does. In order to be consistent and atomic, we
have to return one single copy from the critical section at the expense of some
memory and cpu.
> 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
> Attachments: YARN-6171.000.patch, YARN-6171.001.patch,
> YARN-6171.002.patch, YARN-6171.003.patch
>
>
> 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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