shuffle should use serialization to get comparator
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Key: MAPREDUCE-1126
URL: https://issues.apache.org/jira/browse/MAPREDUCE-1126
Project: Hadoop Map/Reduce
Issue Type: Improvement
Components: task
Reporter: Doug Cutting
Currently the key comparator is defined as a Java class. Instead we should use
the Serialization API to create key comparators. This would permit, e.g.,
Avro-based comparators to be used, permitting efficient sorting of complex data
types without having to write a RawComparator in Java.
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