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https://issues.apache.org/jira/browse/HADOOP-6596?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12837948#action_12837948
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Jeff Hammerbacher commented on HADOOP-6596:
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Hey Owen,

Could you describe to me what you mean by "metadata channel"? The Avro file 
object container has room in the header for extensible metadata, as does the 
Avro RPC handshake request.

Thanks,
Jeff

> Should add version to the serialization of DelegationToken
> ----------------------------------------------------------
>
>                 Key: HADOOP-6596
>                 URL: https://issues.apache.org/jira/browse/HADOOP-6596
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: security
>            Reporter: Owen O'Malley
>            Assignee: Owen O'Malley
>         Attachments: c-6596.patch, c-6596.patch
>
>
> Now that we are adding the serialized form of delegation tokens into the http 
> interfaces, we should include some version information.

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