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https://issues.apache.org/jira/browse/HADOOP-6527?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13402497#comment-13402497
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Bikas Saha commented on HADOOP-6527:
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lgtm. Looks good to go unless more experienced folks have concerns.
> UserGroupInformation::createUserForTesting clobbers already defined group
> mappings
> ----------------------------------------------------------------------------------
>
> Key: HADOOP-6527
> URL: https://issues.apache.org/jira/browse/HADOOP-6527
> Project: Hadoop Common
> Issue Type: Bug
> Components: security
> Reporter: Jakob Homan
> Assignee: Ivan Mitic
> Attachments: HADOOP-6527-branch-1-win_UGI_fix.patch
>
>
> In UserGroupInformation::createUserForTesting the follow code creates a new
> groups instance, obliterating any groups that have been previously defined in
> the static groups field.
> {code} if (!(groups instanceof TestingGroups)) {
> groups = new TestingGroups();
> }
> {code}
> This becomes a problem in tests that start a Mini{DFS,MR}Cluster and then
> create a testing user. The user that started the user (generally the real
> user running the test) immediately has their groups wiped out and is
> prevented from accessing files/folders/queues they should be able to. Before
> the UserGroupInformation.createRemoteUserForTesting, calls to userA.getGroups
> may return {"a", "b", "c"} and immediately after the new fake user is
> created, the same call will return an empty array.
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