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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 link to deprecated Mapper class ------------------------------------------------------------------------------ offsets. As key-value pairs are read from the !RecordReader they are - passed to the configured [http://hadoop.apache.org/core/docs/current/api/org/apache/hadoop/mapred/Mapper.html Mapper]. The user supplied Mapper does + passed to the configured [http://hadoop.apache.org/core/docs/current/api/org/apache/hadoop/mapreduce/Mapper.html Mapper]. The user supplied Mapper does whatever it wants with the input pair and calls [http://hadoop.apache.org/core/docs/current/api/org/apache/hadoop/mapred/OutputCollector.html#collect(org.apache.hadoop.io.WritableComparable,%20org.apache.hadoop.io.Writable) OutputCollector.collect] with key-value pairs of its own choosing. The output it generates must use one key class and one value class. This is because the Map output will be written into a SequenceFile
