Hadoop mapreduce : Driver for chaining mappers within a MapReduce job

Question

I have mapreduce job: my code Map class:

public static class MapClass extends Mapper {

    @Override
    public void m         


        

Answer 1

For the First argument of your ChainMapper.addMapper(), you have passed the job object. While the function is expecting a object of type JobConf. Rewriting to :

 ChainMapper.addMapper(
            (JobConf)conf, 
            MapClass.class, 
            Text.class, 
            Text.class, 
            Text.class, 
            Text.class, 
            true, 
            map1
            ); 

should solve the problem..