Map-R program
What is
Map-R program?
Map reduced program often called Map-R program. It is
a programming approach to create / process large datasets in a parallel, distributed
way in a given cluster.
Map-R program is a combination of Map function and Reduce
function.
In general, Map-R program is classified in two major steps.
1) Map function
2) Reduce function
Map Step
Master
node reads the input, and will divide the task into number of smaller tasks and
assigns them into the worker nodes in the cluster.
Reduce Step
Master
node collects the output from all the worked nodes, creates as a single output
based on the keys or some other way.
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