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https://issues.apache.org/jira/browse/YARN-668?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14062331#comment-14062331
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Vinod Kumar Vavilapalli commented on YARN-668:
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One other important point from the design doc at YARN-666 is to make sure that,
during the upgrade, tokens are accepted by both the old and new NMs. We need
some magic on the ResourceManager.
> TokenIdentifier serialization should consider Unknown fields
> ------------------------------------------------------------
>
> Key: YARN-668
> URL: https://issues.apache.org/jira/browse/YARN-668
> Project: Hadoop YARN
> Issue Type: Sub-task
> Reporter: Siddharth Seth
> Assignee: Vinod Kumar Vavilapalli
>
> This would allow changing of the TokenIdentifier between versions. The
> current serialization is Writable. A simple way to achieve this would be to
> have a Proto object as the payload for TokenIdentifiers, instead of
> individual fields.
> TokenIdentifier continues to implement Writable to work with the RPC layer -
> but the payload itself is serialized using PB.
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