FUNDAMENTALS OF COMPUTER

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DATABASE FUNDAMENTALS

BASICS OF BIG DATA

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
To use MapReduce, a programmer only needs to create two programs, namely programs that contain calculations or procedures to be carried out by the process____
A
Map
B
Reduce
C
Map and Reduce
D
Mapping Location
E
Share Location
Explanation: 

Detailed explanation-1: -With the MapReduce programming model, programmers need to specify two functions: Map and Reduce. The Map function receives a key/value pair as input and generates intermediate key/value pairs to be further processed.

Detailed explanation-2: -MapReduce simplifies this problem drastically by eliminating task identities or the ability for task partitions to communicate with one another. An individual task sees only its own direct inputs and knows only its own outputs, to make this failure and restart process clean and dependable.

Detailed explanation-3: -The MapReduce algorithm contains two important tasks, namely Map and Reduce. Map takes a set of data and converts it into another set of data, where individual elements are broken down into tuples (key/value pairs).

Detailed explanation-4: -Hadoop streaming is a utility that comes with the Hadoop distribution. This utility allows you to create and run Map/Reduce jobs with any executable or script as the mapper and/or the reducer.

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