MapFile doesn't worh with serializables other than Writables
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                 Key: HADOOP-6129
                 URL: https://issues.apache.org/jira/browse/HADOOP-6129
             Project: Hadoop Common
          Issue Type: Improvement
          Components: io, mapred
    Affects Versions: 0.20.0
            Reporter: Justin Patterson


Since 0.18 (I think), SequenceFiles have supported serializing arbitrary 
objects through the serialization framework.  MapFiles still don't.  They 
require WritableComparable keys and Writable values.

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