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https://issues.apache.org/jira/browse/HADOOP-10769?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14052493#comment-14052493
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Larry McCay commented on HADOOP-10769:
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After some more thought on this, I think the way forward may best be the
extension pattern.
This leaves the responsibility of fetching tokens and/or populating the
credentials object outside of the the key provider but available for providers
that explicitly call it out.
> Add getDelegationToken() method to KeyProvider
> ----------------------------------------------
>
> Key: HADOOP-10769
> URL: https://issues.apache.org/jira/browse/HADOOP-10769
> Project: Hadoop Common
> Issue Type: Improvement
> Components: security
> Affects Versions: 3.0.0
> Reporter: Alejandro Abdelnur
> Assignee: Arun Suresh
>
> The KeyProvider API needs to return delegation tokens to enable access to the
> KeyProvider from processes without Kerberos credentials (ie Yarn containers).
> This is required for HDFS encryption and KMS integration.
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