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https://issues.apache.org/jira/browse/HADOOP-1986?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12532251
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Owen O'Malley commented on HADOOP-1986:
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I think to actually do something other than use Java serialization, you pretty
much need a superclass that supports conversion to and from bytes.
Realistically, with the current Thrift implementation, you'd need to register a
serializer for each specific class. *Yuck*
However, according to the Thrift developers adding a base class would be easy
and they are considering doing it.
> 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
>
>
> 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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