FAILEDError java io IOException Type mismatch in key from map

Question

I keep getting this error:

/04/07 09:13:32 INFO mapreduce.Job: Task Id : attempt_1528714825862_105775_m_000000_2, Status : FAILEDError: java.io.IOException: Type mismatch in key from map: expected org.apache.hadoop.io.Text, received org.apache.hadoop.io.IntWritable

Answer 1

This error is thrown when the parameters of the map function or the reduce function is not correct. In your case, in the map function, the parameter expected was Text but you had given IntWritable. Make the change and it should work fine.