On a cluster running MapReduce v2 (MRv2) on YARN, a MapReduce job is given a
directory of 10 plain text as its input directory. Each file is made up of 3 HDFS blocks. How
many Mappers will run?

A.
We cannot say; the number of Mappers is determined by the RsourceManager

B.
We cannot say; the number of Mappers is determined by the ApplicationManager

C.
We cannot say; the number of Mappers is determined by the developer

D.
30

E.
3

F.
10