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https://issues.apache.org/jira/browse/HADOOP-10769?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14049352#comment-14049352
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Alejandro Abdelnur commented on HADOOP-10769:
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[~lmccay], if the {{KeyProvider}} is not accessible from services/tasks in the
cluster it is pretty much useless. And DelegationTokens enable secure access to
it from processes without Kerberos credentials. A local KeyProvider (such as
JavaKeyStore or User) only serve special and restricted usecases where
distributed access is not required. Given that, I believe getting delegation
tokens belongs the basic {{KeyProvider}} API.
> 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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