CCD-410 Exam Dumps | You have written a Mapper which invokes the following five calls to the OutputColletor.collect method:

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You have written a Mapper which invokes the following five calls to the OutputColletor.collect method:
output.collect (new Text ("Apple"), new Text ("Red") ) ;
output.collect (new Text ("Banana"), new Text ("Yellow") ) ;
output.collect (new Text ("Apple"), new Text ("Yellow") ) ;
output.collect (new Text ("Cherry"), new Text ("Red") ) ;
output.collect (new Text ("Apple"), new Text ("Green") ) ;
How many times will the Reducer's reduce method be invoked?

A. 6

B. 3

C. 1

D. 0

E. 5

Correct Answer: B

Explanation/Reference:
reduce() gets called once for each [key, (list of values)] pair. To explain, let's say you called:
out.collect(new Text("Car"),new Text("Subaru");
out.collect(new Text("Car"),new Text("Honda");
out.collect(new Text("Car"),new Text("Ford");
out.collect(new Text("Truck"),new Text("Dodge");
out.collect(new Text("Truck"),new Text("Chevy");
Then reduce() would be called twice with the pairs
reduce(Car, <Subaru, Honda, Ford>)
reduce(Truck, <Dodge, Chevy>)
Reference: Mapper output.collect()?

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