Mapreduce algorithm
Describe the general mapreduce algorithm.
Expert
The mapreduce algorithm mainly has four main phases:
a) Map,
b) Combine,
c) Shuttle and sort
d) Phase output
Mappers simply execute on unsorted key/values pairs. They form the intermediate keys. Once these keys are ready the combiners pair the key/value pairs along with the right key. The shuttle/sort is done by the framework their role being to group the data and transfer it. Once completed, it will proceed for output through the phase output process.
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