Hadoop reducing data from mapper to combiner
Mark,
The reducer is not being called/invoked.
The reducer class definition should look like -
public class KeywordReducer extends Reducer<Text, Text, Text, Text>
instead of
public class KeywordReducer extends Reducer<Text, Iterable<Text>, Text, Text>
as the map output should correspond to this. The reduce() method signature is correct.
Hope this helps.