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https://issues.apache.org/jira/browse/YARN-3103?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14293959#comment-14293959
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Xuan Gong commented on YARN-3103:
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bq. This leads to two AMRM tokens in the credentials and can still fail if the
AMRMTokenSelector picks the wrong one.
[~jlowe] Could you explain more clearly why this can happen, please ? I do not
get it right now.
> AMRMClientImpl does not update AMRM token properly
> --------------------------------------------------
>
> Key: YARN-3103
> URL: https://issues.apache.org/jira/browse/YARN-3103
> Project: Hadoop YARN
> Issue Type: Bug
> Components: client
> Affects Versions: 2.6.0
> Reporter: Jason Lowe
> Assignee: Jason Lowe
> Priority: Blocker
>
> AMRMClientImpl.updateAMRMToken updates the token service _before_ storing it
> to the credentials, so the token is mapped using the newly updated service
> rather than the empty service that was used when the RM created the original
> AMRM token. This leads to two AMRM tokens in the credentials and can still
> fail if the AMRMTokenSelector picks the wrong one.
> In addition the AMRMClientImpl grabs the login user rather than the current
> user when security is enabled, so it's likely the UGI being updated is not
> the UGI that will be used when reconnecting to the RM.
> The end result is that AMs can fail with invalid token errors when trying to
> reconnect to an RM after a new AMRM secret has been activated.
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