Briefing Cloudera Knowledge

How many keys will be passed to the Reducer’s reduce method?

You have the following key-value pairs as output from your Map task:
(the, 1)
(fox, 1)
(faster, 1)
(than, 1)
(the, 1)
(dog, 1)
How many keys will be passed to the Reducer’s reduce method?

A.
Six

B.
Five

C.
Four

D.
Two

E.
One

F.
Three

Explanation:
Only one key value pair will be passed from the two (The, 1) key value pairs.