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https://issues.apache.org/jira/browse/HADOOP-6685?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12933369#action_12933369
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Tom White commented on HADOOP-6685:
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My point was about modularity: the core should not depend on a particular set 
of serialization libraries with particular versions, since it hampers users' 
ability to use later versions of serialization libraries. The concrete change I 
would make is to move the serializations to contrib modules so that they can be 
more easily updated than core.

> Change the generic serialization framework API to use serialization-specific 
> bytes instead of Map<String,String> for configuration
> ----------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-6685
>                 URL: https://issues.apache.org/jira/browse/HADOOP-6685
>             Project: Hadoop Common
>          Issue Type: Improvement
>            Reporter: Owen O'Malley
>            Assignee: Owen O'Malley
>             Fix For: 0.22.0
>
>         Attachments: libthrift.jar, serial.patch, serial4.patch, 
> serial6.patch, SerializationAtSummit.pdf
>
>
> Currently, the generic serialization framework uses Map<String,String> for 
> the serialization specific configuration. Since this data is really internal 
> to the specific serialization, I think we should change it to be an opaque 
> binary blob. This will simplify the interface for defining specific 
> serializations for different contexts (MAPREDUCE-1462). It will also move us 
> toward having serialized objects for Mappers, Reducers, etc (MAPREDUCE-1183).

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