Class Not Found Exception in Mapreduce wordcount job

Question

i am trying to run a wordcount job in hadoop.but always getting a class not found exception.I am posting the class that i wrote and the command i using to run the job

Answer 1

Though MapReduce program is parallel processing. Mapper, Combiner and Reducer class has sequence flow. Have to wait for completing each flow depends on other class so need job.waitForCompletion(true); But It must to set input and output path before starting Mapper, Combiner and Reducer class. Reference

Change your code like this:

 public static void main(String[] args) throws Exception {
    Configuration conf = new Configuration();

    Job job = new Job(conf, "WordCount");

    FileInputFormat.addInputPath(job, new Path(args[0]));
    FileOutputFormat.setOutputPath(job, new Path(args[1]));

    job.setJarByClass(WordCount.class);
    job.waitForCompletion(true);

    job.setOutputKeyClass(Text.class);
    job.setOutputValueClass(IntWritable.class);

    job.setMapperClass(Map.class);
    job.setReducerClass(Reduce.class);

    job.setInputFormatClass(TextInputFormat.class);
    job.setOutputFormatClass(TextOutputFormat.class);
 }

I hope this will works.