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NEW QUESTION: 1
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. 0
B. 1
C. 2
D. 3
E. 4
Answer: B
Explanation:
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()?

NEW QUESTION: 2

A. Option D
B. Option A
C. Option C
D. Option B
Answer: D

NEW QUESTION: 3
What is one of the main purposes of the project charter?
A. Formal definition of stakeholder roles and responsibilities
B. Formal authorization of the existence of the project
C. Formal acceptance of the project management plan
D. Formal approval of the detailed project budget
Answer: B