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https://issues.apache.org/jira/browse/HADOOP-13066?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15262928#comment-15262928
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Mingliang Liu commented on HADOOP-13066:
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I'm wondering if it merits to improve the javadoc of the
{{loginUserFromKeytab()}} method.
# To briefly document that, the logged-in user is process-global and there is
no atomic semantic between {{loginUserFromKeytab()}} and {{getLoginUser()}}
calls.
# Add {{@see loginUserFromKeytabAndReturnUGI()}} for reference
> 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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