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https://issues.apache.org/jira/browse/HADOOP-16621?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17008981#comment-17008981
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Steve Loughran commented on HADOOP-16621:
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I'm for #1, maybe with a backport of the helper methods to older versions just 
so that you can switch to it everywhere

And add something to the release notes, obviously. We have the "evolving" tag 
as a get-out

Nobody is using this outside our code AFAIK, 

something to raise on the dev lists, IMO

> [pb-upgrade] spark-hive doesn't compile against hadoop trunk because of 
> Token's marshalling
> -------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-16621
>                 URL: https://issues.apache.org/jira/browse/HADOOP-16621
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: common
>    Affects Versions: 3.3.0
>            Reporter: Steve Loughran
>            Assignee: Vinayakumar B
>            Priority: Major
>
> the move to protobuf 3.x stops spark building because Token has a method 
> which returns a protobuf, and now its returning some v3 types.
> if we want to isolate downstream code from protobuf changes, we need to move 
> that marshalling method from token and put in a helper class.



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