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The following page has been changed by MarcoNicosia: http://wiki.apache.org/lucene-hadoop/HadoopMapReduce ------------------------------------------------------------------------------ writer per configured reduce task. It will then proceed to read its !FileSplit using the [http://lucene.apache.org/hadoop/docs/api/org/apache/hadoop/mapred/RecordReader.html RecordReader] it gets from the specified [http://lucene.apache.org/hadoop/docs/api/org/apache/hadoop/mapred/InputFormat.html InputFormat]. !InputFormat parses the input and generates - key-value pairs. !InputFormat must also handle records that may be split on the !FileSplit boundary. For example [http://svn.apache.org/viewcvs.cgi/lucene/hadoop/trunk/src/java/org/apache/hadoop/mapred/TextInputFormat.java?view=markup TextInputFormat] will read the last line of the !FileSplit past the split boundary and, when reading other than the first !FileSplit, !TestInputFormat ignores the content up to the first newline. + key-value pairs. !InputFormat must also handle records that may be split on the !FileSplit boundary. For example [http://svn.apache.org/viewcvs.cgi/lucene/hadoop/trunk/src/java/org/apache/hadoop/mapred/TextInputFormat.java?view=markup TextInputFormat] will read the last line of the !FileSplit past the split boundary and, when reading other than the first !FileSplit, !TextInputFormat ignores the content up to the first newline. It is not necessary for the !InputFormat to generate both meaningful keys ''and'' values. For example the
