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https://issues.apache.org/jira/browse/HADOOP-3788?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12633818#action_12633818
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Doug Cutting commented on HADOOP-3788:
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> Don't we already have one of those floating around Hadoop somewhere? 

If not, there's one in TFile (HADOOP-3315) that should be shared.

> Add serialization for Protocol Buffers
> --------------------------------------
>
>                 Key: HADOOP-3788
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3788
>             Project: Hadoop Core
>          Issue Type: Wish
>          Components: contrib/serialization, examples, mapred
>            Reporter: Tom White
>            Assignee: Alex Loddengaard
>             Fix For: 0.20.0
>
>         Attachments: hadoop-3788-v1.patch, hadoop-3788-v2.patch, 
> protobuf-java-2.0.1.jar
>
>
> Protocol Buffers (http://code.google.com/p/protobuf/) are a way of encoding 
> data in a compact binary format. This issue is to write a 
> ProtocolBuffersSerialization to support using Protocol Buffers types in 
> MapReduce programs, including an example program. This should probably go 
> into contrib. 

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