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https://issues.apache.org/jira/browse/YARN-668?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14137999#comment-14137999
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Tsuyoshi OZAWA commented on YARN-668:
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+1(non-binding) for making TokenIdentifier serialization protobuf. With the
change, we can do versioning TokenIdentifier and co-exist old and new
TokenIdentifier.
> 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
> Priority: Blocker
>
> 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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