Type mismatch in key from map: expected org.apache.hadoop.io.Text, recieved org.apache.hadoop.io.LongWritable

Question

I am trying to run a map/reducer in java. Below are my files

WordCount.java

package counter;


public class          


        

Answer 1

Add these 2 lines in your code :

job.setMapOutputKeyClass(Text.class);
job.setMapOutputValueClass(IntWritable.class);

You are using TextOutputFormat which emits LongWritable key and Text value by default, but you are emitting Text as key and IntWritable as value. You need to tell this to the famework.

HTH