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Question ID 12471

In a large MapReduce job with m mappers and n reducers, how many distinct copy
operations will there be in the sort/shuffle phase?

Option A

mXn (i.e., m multiplied by n)

Option B

n

Option C

m

Option D

m+n (i.e., m plus n)

Option E

E. mn (i.e., m to the power of n)

Correct Answer A
Explanation Explanation: A MapReduce job with m mappers and r reducers involves up to m * r distinct copy operations, since each mapper may have intermediate output going to every reducer.


Question ID 12472

In a MapReduce job with 500 map tasks, how many map task attempts will there be?

Option A

 It depends on the number of reduces in the job.

Option B

Between 500 and 1000.

Option C

At most 500.

Option D

 At least 500.

Option E

Exactly 500.

Correct Answer D
Explanation Explanation: From Cloudera Training Course: Task attempt is a particular instance of an attempt to execute a task There will be at least as many task attempts as there are tasks If a task attempt fails, another will be started by the JobTracker Speculative execution can also result in more task attempts than completed tasks

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