At a high level, what is the purpose of the following mapper and reducer combination?
Mapper:
FOR EACH line IN input
v = -inf
FOR EACH number IN line
IF number > v, THEN v = number
emit ("v", v)
Reducer:
FOR EACH line IN input
v = -inf
FOR EACH number IN line
IF number > v, THEN v = number
emit ("v", v)
Does not produce any output
Computes the maximum integer in the input