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Run <a href="https://hadoop.apache.org/">Hadoop</a> MapReduce jobs over
Avro data, with map and reduce functions run in a sub-process. This
permits MapReduce programs over Avro data in languages besides Java.
<p>
Each language will provide a framework to permit easy implementation
of MapReduce programs in that language. Currently only a Java
framework has been implemented, for test purposes, so this feature is
not yet useful.
<p>
This is still an experimental API, subject to change.
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