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https://issues.apache.org/jira/browse/MAPREDUCE-377?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13081031#comment-13081031
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Pere Ferrera Bertran commented on MAPREDUCE-377:
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PB integration with Hadoop is now possible by using Protostuff 
(http://code.google.com/p/protostuff/) by calling 
ProtobufIOUtil.writeDelimitedTo() and ProtobufIOUtil.mergeDelimitedFrom() . 
These methods avoid the problem with consuming too many bytes from the stream.

> Add serialization for Protocol Buffers
> --------------------------------------
>
>                 Key: MAPREDUCE-377
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-377
>             Project: Hadoop Map/Reduce
>          Issue Type: Wish
>            Reporter: Tom White
>            Assignee: Alex Loddengaard
>         Attachments: hadoop-3788-v1.patch, hadoop-3788-v2.patch, 
> hadoop-3788-v3.patch, protobuf-java-2.0.1.jar, protobuf-java-2.0.2.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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