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https://issues.apache.org/jira/browse/MAPREDUCE-3750?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Eli Collins resolved MAPREDUCE-3750.
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Resolution: Duplicate
Dupe of MAPREDUCE-3749
> ConcurrentModificationException in counter groups
> -------------------------------------------------
>
> Key: MAPREDUCE-3750
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-3750
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Reporter: Tom White
> Priority: Blocker
>
> Iterating over a counter's groups while adding more groups results in a
> ConcurrentModificationException. This was discovered while running Hive unit
> tests on a recent 0.23 version of Hadoop.
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