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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