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The following page has been changed by DanielTunkelang: http://wiki.apache.org/hadoop/HadoopMapReduce The comment on the change is: updated links to deprecated Partitioner and HashPartitioner classes ------------------------------------------------------------------------------ When Mapper output is collected it is partitioned, which means that it will be written to the output specified by the - [http://hadoop.apache.org/core/docs/current/api/org/apache/hadoop/mapred/Partitioner.html Partitioner]. The default [http://hadoop.apache.org/core/docs/current/api/org/apache/hadoop/mapred/lib/HashPartitioner.html HashPartitioner] uses the + [http://hadoop.apache.org/core/docs/current/api/org/apache/hadoop/mapreduce/Partitioner.html Partitioner]. The default [http://hadoop.apache.org/core/docs/current/api/org/apache/hadoop/mapreduce/lib/partition/HashPartitioner.html HashPartitioner] uses the hashcode function on the key's class (which means that this hashcode function must be good in order to achieve an even workload across the reduce tasks). See [http://svn.apache.org/viewcvs.cgi/hadoop/core/trunk/src/mapred/org/apache/hadoop/mapred/MapTask.java?view=markup MapTask] for details. N input files will generate M map tasks to be run and each map
