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https://issues.apache.org/jira/browse/HADOOP-1986?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12532999
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Tom White commented on HADOOP-1986:
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Dennis,

> Here is a SerializableWritable implementation that we currently use.

Thanks. This is an example of a wrapper that I hope we can move away from - 
instead of writing MapReduce jobs with SerializableWritable types (and 
wrapping/unwrapping using setSerializable/getSerializable), you would be able 
to write them directly using Serializable types.

> Add support for a general serialization mechanism for Map Reduce
> ----------------------------------------------------------------
>
>                 Key: HADOOP-1986
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1986
>             Project: Hadoop
>          Issue Type: New Feature
>          Components: mapred
>            Reporter: Tom White
>             Fix For: 0.16.0
>
>         Attachments: SerializableWritable.java
>
>
> Currently Map Reduce programs have to use WritableComparable-Writable 
> key-value pairs. While it's possible to write Writable wrappers for other 
> serialization frameworks (such as Thrift), this is not very convenient: it 
> would be nicer to be able to use arbitrary types directly, without explicit 
> wrapping and unwrapping.

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