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https://issues.apache.org/jira/browse/HADOOP-7829?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13152668#comment-13152668
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Owen O'Malley commented on HADOOP-7829:
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Tokens all implement Writable, and thus can be serialized and deserialized
easily.
The NameNode stores the tokens in the fsimage (and removes them when they are
cancelled), so that on restart the tokens survive.
> Delegation token manager should support token store abstraction
> ---------------------------------------------------------------
>
> Key: HADOOP-7829
> URL: https://issues.apache.org/jira/browse/HADOOP-7829
> Project: Hadoop Common
> Issue Type: Improvement
> Components: security
> Affects Versions: 0.20.205.0, 0.23.0
> Reporter: Thomas Weise
>
> There are several issues with the interfaces in .20 that make it difficult to
> incorporate this as extension currently (see HIVE-2467). The plan is to port
> relevant changes to Hadoop so that future versions of the shim in Hive (or
> projects with similar needs) are easier to implement.
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