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https://issues.apache.org/jira/browse/YARN-6563?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16000028#comment-16000028
]
Haibo Chen commented on YARN-6563:
----------------------------------
Looks like we need to synchronize on the collectors object, per javadoc at
http://docs.oracle.com/javase/8/docs/api/java/util/Collections.html#synchronizedMap-java.util.Map-
> ConcurrentModificationException in TimelineCollectorManager while stopping RM
> -----------------------------------------------------------------------------
>
> Key: YARN-6563
> URL: https://issues.apache.org/jira/browse/YARN-6563
> Project: Hadoop YARN
> Issue Type: Bug
> Components: resourcemanager
> Reporter: Rohith Sharma K S
>
> It is seen that ConcurrentModificationException while stopping RM when ATSv2
> enabled.
> {noformat}
> 2017-05-05 15:04:11,563 WARN org.apache.hadoop.service.CompositeService: When
> stopping the service
> org.apache.hadoop.yarn.server.resourcemanager.timelineservice.RMTimelineCollectorManager
> : java.util.ConcurrentModificationException
> java.util.ConcurrentModificationException
> at java.util.HashMap$HashIterator.nextNode(HashMap.java:1437)
> at java.util.HashMap$ValueIterator.next(HashMap.java:1466)
> at
> org.apache.hadoop.yarn.server.timelineservice.collector.TimelineCollectorManager.serviceStop(TimelineCollectorManager.java:222)
> at
> org.apache.hadoop.service.AbstractService.stop(AbstractService.java:221)
> at
> org.apache.hadoop.service.ServiceOperations.stop(ServiceOperations.java:52)
> at
> org.apache.hadoop.service.ServiceOperations.stopQuietly(ServiceOperations.java:80)
> at
> org.apache.hadoop.service.CompositeService.stop(CompositeService.java:157)
> at
> org.apache.hadoop.service.CompositeService.serviceStop(CompositeService.java:131)
> at
> org.apache.hadoop.yarn.server.resourcemanager.ResourceManager.serviceStop(ResourceManager.java:1285)
> {noformat}
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