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https://issues.apache.org/jira/browse/YARN-2826?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14203193#comment-14203193
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Vinod Kumar Vavilapalli commented on YARN-2826:
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Thanks you, +1, checking this in.

> User-Group mappings not updated by RM when a user is removed from a group.
> --------------------------------------------------------------------------
>
>                 Key: YARN-2826
>                 URL: https://issues.apache.org/jira/browse/YARN-2826
>             Project: Hadoop YARN
>          Issue Type: Bug
>            Reporter: sidharta seethana
>            Assignee: Wangda Tan
>            Priority: Critical
>         Attachments: YARN-2826-1.patch
>
>
> Removing a user from a group isn't reflected in getGroups even after a 
> refresh. The following sequence fails in step 7. 
> 1) add test_user to a machine with group1 
> 2) add test_user to group2 on the machine 
> 3) yarn rmadmin -refreshUserToGroupsMappings (expected to refresh user to 
> group mappings) 
> 4) yarn rmadmin -getGroups test_user (and ensure that user is in group2) 
> 5) remove user from group2 on the machine 
> 6) yarn rmadmin -refreshUserToGroupsMappings (expected to refresh user to 
> group mappings) 
> 7) yarn rmadmin -getGroups test_user (and ensure that user NOT in group2) 



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