CLONE -hadoop should provide a common way to wrap instances with different
types into one type
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Key: HADOOP-839
URL: http://issues.apache.org/jira/browse/HADOOP-839
Project: Hadoop
Issue Type: Improvement
Components: io
Environment: All environment
Reporter: Feng Jiang
Fix For: 0.9.0
When two sequence files, which have same Key type but different Value types,
are mapped out to reduce, multiple Value types is not allowed. In this case, we
need a way to wrap instances with different types into one class type to reduce.
In current code, ObjectWritable is a sole choice. but it costs too many space,
because the class declaration will be appended into output file as a string for
every Key-value pair.
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