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From "Mingliang Liu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-13066) UserGroupInformation.loginWithKerberos/getLoginUser is not thread-safe
Date Wed, 27 Apr 2016 23:37:12 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-13066?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15261196#comment-15261196
] 

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

Isn't {{UserGroupInformation#getLoginUser()}} protected by the {{UserGroupInformation}} class
lock as it's both {{static}} and {{synchronized}}?

> 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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