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What is general mapreduce algorithm?

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    The mapreduce algorithm has 4 main phases:
    1. Map,
    2. Combine,
    3. Shuttle and sort
    4. Phase output

    Mappers simply execute on unsorted key/values pairs.They create the intermediate keys. Once these keys are ready the combiners pair the key/value pairs with the right key. The shuttle/sort is done by the framework their role being to group data and transfer it. Once completed, it will proceed for the output via the phase output process.

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