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https://issues.apache.org/jira/browse/MAPREDUCE-4226?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13269737#comment-13269737
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Robert Joseph Evans commented on MAPREDUCE-4226:
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I wasn't sure if it was a critical issue or not, because I didn't have much
context with how this class was used. I am +1 for putting in the patch
unchanged. I still think it needs to be fixed, mostly as defensive programming
so that if things do change in the future this issue does not crop up.
Especially because it is just a single line change that should not really
impact the performance as it is only being called from something that is
holding a bigger lock.
> ConcurrentModificationException in FileSystemCounterGroup
> ---------------------------------------------------------
>
> Key: MAPREDUCE-4226
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4226
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: mrv2
> Affects Versions: 0.23.1
> Reporter: Tom White
> Assignee: Tom White
> Attachments: MAPREDUCE-4226.patch
>
>
> This was seen in a Hive job. I'll attach a failing test case.
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