Ajay Srivastava 2012-06-04, 10:56
Can someone please explain default implementation of grouping comparator i.e. if I do not specify a custom grouping comparator then which comparator is called to decide the grouping for reducer.
I searched a lot on web but could not find a satisfactory explanation for its default implementation.
Devaraj k 2012-06-04, 12:33