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https://issues.apache.org/jira/browse/MAPREDUCE-4065?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13238423#comment-13238423
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Robert Joseph Evans commented on MAPREDUCE-4065:
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I think that would be great, but unfortunately I believe that you need more to 
be able to communicate with Hadoop.  Hadoop does not use pure protocol buffers 
to communicate.  To be able to get protocol buffers up and running quickly we 
kind of punted on some of the security and error handling, and left that part 
of the code in place.  So what happens is that we use the original Hadoop RPC, 
and then serialize/deserialize protocol buffers into and out of it.
                
> Add .proto files to built tarball
> ---------------------------------
>
>                 Key: MAPREDUCE-4065
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4065
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: build
>    Affects Versions: 0.23.2
>            Reporter: Ralph H Castain
>             Fix For: 0.23.3
>
>
> Please add the .proto files to the built tarball so that users can build 3rd 
> party tools that use protocol buffers without having to do an svn checkout of 
> the source code.
> Sorry I don't know more about Maven, or I would provide a patch.

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