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From "Owen O'Malley (JIRA)" <j...@apache.org>
Subject [jira] Created: (MAPREDUCE-1462) Enable context-specific and stateful serializers in MapReduce
Date Fri, 05 Feb 2010 07:38:27 GMT
Enable context-specific and stateful serializers in MapReduce

                 Key: MAPREDUCE-1462
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1462
             Project: Hadoop Map/Reduce
          Issue Type: New Feature
          Components: task
            Reporter: Owen O'Malley
            Assignee: Owen O'Malley

Although the current serializer framework is powerful, within the context of a job it is limited
to picking a single serializer for a given class. Additionally, Avro generic serialization
can make use of additional configuration/state such as the schema. (Most other serialization
frameworks including Writable, Jute/Record IO, Thrift, Avro Specific, and Protocol Buffers
only need the object's class name to deserialize the object.)

With the goal of keeping the easy things easy and maintaining backwards compatibility, we
should be able to allow applications to use context specific (eg. map output key) serializers
in addition to the current type based ones that handle the majority of the cases. Furthermore,
we should be able to support serializer specific configuration/metadata in a type safe manor
without cluttering up the base API with a lot of new methods that will confuse new users.

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