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https://issues.apache.org/jira/browse/YARN-5310?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15362035#comment-15362035
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Allen Wittenauer commented on YARN-5310:
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That's basically introducing a security hole.
> AM restart failed because of the expired HDFS delegation tokens
> ---------------------------------------------------------------
>
> Key: YARN-5310
> URL: https://issues.apache.org/jira/browse/YARN-5310
> Project: Hadoop YARN
> Issue Type: Bug
> Components: yarn
> Reporter: Xianyin Xin
> Assignee: Xianyin Xin
>
> For a long running AM, it would get failed when restart because the token in
> ApplicationSubmissionContext expires. We should update it when we get a new
> delegation token on behalf of the user.
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