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https://issues.apache.org/jira/browse/HADOOP-13805?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15736880#comment-15736880
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Andrew Wang commented on HADOOP-13805:
--------------------------------------

Is this a release blocker? Also HADOOP-13558 has fix versions of 2.7.4 and 
2.8.0, is this targeted at those releases as well?

> UGI.getCurrentUser() fails if user does not have a keytab associated
> --------------------------------------------------------------------
>
>                 Key: HADOOP-13805
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13805
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: security
>    Affects Versions: 2.8.0, 2.9.0, 3.0.0-alpha2
>            Reporter: Alejandro Abdelnur
>            Assignee: Xiao Chen
>            Priority: Blocker
>         Attachments: HADOOP-13805.01.patch, HADOOP-13805.02.patch, 
> HADOOP-13805.03.patch
>
>
> HADOOP-13558 intention was to avoid UGI from trying to renew the TGT when the 
> UGI is created from an existing Subject as in that case the keytab is not 
> 'own' by UGI but by the creator of the Subject.
> In HADOOP-13558 we introduced a new private UGI constructor 
> {{UserGroupInformation(Subject subject, final boolean externalKeyTab)}} and 
> we use with TRUE only when doing a {{UGI.loginUserFromSubject()}}.
> The problem is, when we call {{UGI.getCurrentUser()}}, and UGI was created 
> via a Subject (via the {{UGI.loginUserFromSubject()}} method), we call {{new 
> UserGroupInformation(subject)}} which will delegate to 
> {{UserGroupInformation(Subject subject, final boolean externalKeyTab)}}  and 
> that will use externalKeyTab == *FALSE*. 
> Then the UGI returned by {{UGI.getCurrentUser()}} will attempt to login using 
> a non-existing keytab if the TGT expired.
> This problem is experienced in {{KMSClientProvider}} when used by the HDFS 
> filesystem client accessing an an encryption zone.



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