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https://issues.apache.org/jira/browse/HADOOP-13805?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15664854#comment-15664854
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Xiao Chen commented on HADOOP-13805:
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Thanks [~tucu00] for creating this with great details / reproduction / solution.
Could you help me understand more? Specifically this:
currently UGI is always created with the {{UGI(Subject)}} constructor. If we
set the default to true, then it seems the spawn logic won't be triggered ever.
When should hadoop spawn the background thread to renew? Is the proposal to
make {{false}} the default and only {{true}} when {{loginUserFromKeytab}} /
{{loginUserFromKeytabAndReturnUGI}} / {{loginUserFromTicketCache}} ?
Also, what about {{createRemoteUser}} and {{createProxyUser}}?
> 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
>
> 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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