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https://issues.apache.org/jira/browse/HADOOP-13066?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15261302#comment-15261302
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Sergey Shelukhin commented on HADOOP-13066:
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Yeah, this is the method. Class lock doesn't protect across several method
calls. See my example above...
Thread 1 callls loginUserFromKeytab("hdfs", ...)
Thread 2 calls loginUserFromKeytab("hbase", ...)
Thread 1 calls getLoginUser and will get loginUser hbase.
> 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
> 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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