The data_join should allow the user to implement a customer cloning function
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Key: HADOOP-3684
URL: https://issues.apache.org/jira/browse/HADOOP-3684
Project: Hadoop Core
Issue Type: Bug
Components: mapred
Reporter: Runping Qi
Currently, the framework uses serialization/deserialization to clone the values
passed to the resuce function.
This amounts to a very heavy weight deep copy of the value objects.
That is way too expensive. Although that may be a generic way to work for all
possible value classes, thus good as a default way,
the framework should allow the user to implemet an application specific yet
efficient cloning function.
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