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I use hadoop 1.0.1 to do some project and I want to make my input .txt file be the "key" and "value" which I need, like: If I have a test.txt file and the file content is 1, 10 10 I think I can use "KeyValueTextInputFormat" and make "," be the separation symbol, so after input, the key is "1" and the value is "10 10" . But, the result I got is all the information is key, the value is empty. I dont know where is the problem. Please give me some help, thanks! This is the example code: public class WordCount{ public class WordCountMapper extends Mapper<Text, Text, Text, Text>{ public void map(Text key, Text value, Context context) throws IOException, InterruptedException { context.write(value, value); context.write(key, key); } } public static void main(String[] args) throws Exception { Configuration conf = new Configuration(); conf.set("key.value.separator.in.input.line",","); String[] otherArgs = new GenericOptionsParser(conf, args).getRemainingArgs(); if (otherArgs.length != 2) { System.err.println("Usage: wordcount <in> <out>"); System.exit(2); } Job job = new Job(conf, "word count"); job.setJarByClass(WordCount.class); job.setMapperClass(WordCountMapper.class); job.setInputFormatClass(KeyValueTextInputFormat.class); job.setOutputKeyClass(Text.class); job.setOutputValueClass(Text.class); KeyValueTextInputFormat.addInputPath(job, new Path(otherArgs[0])); FileOutputFormat.setOutputPath(job, new Path(otherArgs[1])); System.exit(job.waitForCompletion(true) ? 0 : 1); } }

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