need comparators in serializer framework
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Key: HADOOP-3380
URL: https://issues.apache.org/jira/browse/HADOOP-3380
Project: Hadoop Core
Issue Type: New Feature
Components: io
Reporter: Doug Cutting
The new serialization framework permits Hadoop to incorporate different
serialization systems, including Hadoop's Writable, Thrift, Java Serialization,
etc. It provides a generic, extensible means (SerializationFactory) to create
serializers and deserializers for arbitrary Java classes. However it does not
include a generic means to create comparators for these classes. Comparators
are required for MapReduce keys and many other computations. Thus we should
enhance the serialization framwork to provide comparators too.
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