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https://issues.apache.org/jira/browse/HDDS-1752?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16881444#comment-16881444
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Hrishikesh Gadre commented on HDDS-1752:
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[~msingh] this looks like a duplicate of HDDS-1372. Do you see this issue with
0.4.1 build?
CC [~nandakumar131]
> ConcurrentModificationException while handling DeadNodeHandler event
> --------------------------------------------------------------------
>
> Key: HDDS-1752
> URL: https://issues.apache.org/jira/browse/HDDS-1752
> Project: Hadoop Distributed Data Store
> Issue Type: Bug
> Components: SCM
> Affects Versions: 0.4.0
> Reporter: Mukul Kumar Singh
> Assignee: Hrishikesh Gadre
> Priority: Major
> Labels: MiniOzoneChaosCluster
>
> ConcurrentModificationException while handling DeadNodeHandler event
> {code}
> 2019-07-02 19:29:25,190 ERROR events.SingleThreadExecutor
> (SingleThreadExecutor.java:lambda$onMessage$1(88)) - Error on execution
> message 56591ec5-c9e4-416c-9a36-db0507739fe5{ip: 192.168.0.2, host: 192.16
> 8.0.2, networkLocation: /default-rack, certSerialId: null}
> java.util.ConcurrentModificationException
> at java.util.HashMap$HashIterator.nextNode(HashMap.java:1442)
> at java.util.HashMap$KeyIterator.next(HashMap.java:1466)
> at java.lang.Iterable.forEach(Iterable.java:74)
> at
> java.util.Collections$UnmodifiableCollection.forEach(Collections.java:1080)
> at
> org.apache.hadoop.hdds.scm.node.DeadNodeHandler.lambda$destroyPipelines$1(DeadNodeHandler.java:99)
> at java.util.Optional.ifPresent(Optional.java:159)
> at
> org.apache.hadoop.hdds.scm.node.DeadNodeHandler.destroyPipelines(DeadNodeHandler.java:98)
> at
> org.apache.hadoop.hdds.scm.node.DeadNodeHandler.onMessage(DeadNodeHandler.java:78)
> at
> org.apache.hadoop.hdds.scm.node.DeadNodeHandler.onMessage(DeadNodeHandler.java:44)
> at
> org.apache.hadoop.hdds.server.events.SingleThreadExecutor.lambda$onMessage$1(SingleThreadExecutor.java:85)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
> at java.lang.Thread.run(Thread.java:748)
> {code}
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