Free CCD-470 Web TestEngine Demo

Q1 Single choice

Custom programmer-defined counters in MapReduce are:

A
Lightweight devices for bookkeeping within MapReduce programs.
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B
Lightweight devices for ensuring the correctness of a MapReduce program.Mappers Increment counters, and reducers decrement counters. If at the end of the program the counters read zero, then you are sure that the job completed correctly.
C
Lightweight devices for synchronization within MapReduce programs. You can use counters to coordinate execution between a mapper and a reducer.

CCD-470 Web TestEngine demo