[ https://issues.apache.org/jira/browse/HADOOP-13066?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15262667#comment-15262667 ] 

Mingliang Liu commented on HADOOP-13066:
----------------------------------------

Thanks [~cnauroth] for the comment. This is a very valid point.

> UserGroupInformation.loginWithKerberos/getLoginUser is not thread-safe
> ----------------------------------------------------------------------
>
>                 Key: HADOOP-13066
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13066
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: security
>            Reporter: Sergey Shelukhin
>
> When calling loginFromKerberos, a static variable is set up with the result. If someone logs in as a different user from a different thread, the call to getLoginUser will not return the correct UGI.



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