Which interface should your class implement?

You are developing a combiner that takes as input Text keys, IntWritable values, and emits Text keys, IntWritable values.

Which interface should your class implement?
A . Combiner <Text, IntWritable, Text, IntWritable>
B . Mapper <Text, IntWritable, Text, IntWritable>
C . Reducer <Text, Text, IntWritable, IntWritable>
D . Reducer <Text, IntWritable, Text, IntWritable>
E . Combiner <Text, Text, IntWritable, IntWritable>

View Answer

Answer: D