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https://issues.apache.org/jira/browse/HADOOP-7854?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Daryn Sharp updated HADOOP-7854:
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Attachment: HADOOP-7854.patch
Simply added synchronized keyword. I'm not sure how I can write a unit test...
> UGI getCurrentUser is not synchronized
> --------------------------------------
>
> Key: HADOOP-7854
> URL: https://issues.apache.org/jira/browse/HADOOP-7854
> Project: Hadoop Common
> Issue Type: Bug
> Components: security
> Affects Versions: 0.20.205.1
> Reporter: Daryn Sharp
> Assignee: Daryn Sharp
> Priority: Critical
> Attachments: HADOOP-7854.patch
>
>
> Sporadic {{ConcurrentModificationExceptions}} are originating from
> {{UGI.getCurrentUser}} when it needs to create a new instance. The problem
> was specifically observed in a JT under heavy load when a post-job cleanup is
> accessing the UGI while a new job is being processed.
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