[jira] [Commented] (HADOOP-6527) UserGroupInformation::createUserForTesting clobbers already defined group mappings

["Bikas Saha (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-6527?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13402492#comment-13402492 ] 

Bikas Saha commented on HADOOP-6527:
------------------------------------

Have tests been run on both Windows and Linux to verify?
                
> 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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