[ 
https://issues.apache.org/jira/browse/HDDS-1752?focusedWorklogId=275538&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-275538
 ]

ASF GitHub Bot logged work on HDDS-1752:
----------------------------------------

                Author: ASF GitHub Bot
            Created on: 11/Jul/19 22:36
            Start Date: 11/Jul/19 22:36
    Worklog Time Spent: 10m 
      Work Description: hgadre commented on pull request #1080:  HDDS-1752 Use 
concurrent set implementation for node to pipelines ma…
URL: https://github.com/apache/hadoop/pull/1080
 
 
   …pping
 
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Issue Time Tracking
-------------------

            Worklog Id:     (was: 275538)
            Time Spent: 10m
    Remaining Estimate: 0h

> 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, pull-request-available
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> 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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