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https://issues.apache.org/jira/browse/HADOOP-7389?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13048948#comment-13048948
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Todd Lipcon commented on HADOOP-7389:
-------------------------------------
well, if the underlying implementation returned null, then it would be a bug,
right? In which case this behavior would be masking the bug in the underlying
implementation.
> Use of TestingGroups by tests causes subsequent tests to fail
> -------------------------------------------------------------
>
> Key: HADOOP-7389
> URL: https://issues.apache.org/jira/browse/HADOOP-7389
> Project: Hadoop Common
> Issue Type: Bug
> Components: test
> Affects Versions: 0.23.0
> Reporter: Aaron T. Myers
> Assignee: Aaron T. Myers
> Fix For: 0.23.0
>
> Attachments: hadoop-7389.0.patch
>
>
> As mentioned in HADOOP-6671,
> {{UserGroupInformation.createUserForTesting(...)}} manipulates static state
> which can cause test cases which are run after a call to this function to
> fail.
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