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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 FileSplit class ------------------------------------------------------------------------------ == Map == As the Map operation is parallelized the input file set is first - split to several pieces called [http://hadoop.apache.org/core/docs/current/api/org/apache/hadoop/mapred/FileSplit.html FileSplits]. If an individual file + split to several pieces called [http://hadoop.apache.org/core/docs/current/api/org/apache/hadoop/mapreduce/lib/input/FileSplit.html FileSplits]. If an individual file is so large that it will affect seek time it will be split to several Splits. The splitting does not know anything about the input file's internal logical structure, for example
