I think what you do in that case is to write your own Partitioner class.
The default partitioning is based on the hash value. See
http://wiki.apache.org/hadoop/HadoopMapReduce
Raymond Jennings III wrote:
Is it possible to override a method in the reducer so that similar keys will be grouped together?
For example I want all keys of value "KEY1" and "KEY2" to merged together. (My
reducer has a KEY of type TEXT.) Thanks.
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