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Questions tagged [map-reduce]

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MongoDB mapreduce

I'm new to programming and mongoDB and learning as I go, I'm attempting a mapreduce on a dataset using mongoDB. So far I've converted the csv to json and imported it into a mongoDB using compass. In ...
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Is mapreduce just distributed merge-sort?

Both basically have 2 parts: Part 1: Divide up your data into many smaller parts that is small enough for you to work on each individually. Part 2: Merge the results from all the small parts to ...
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What is a good data-structure to store intermediary results of map-reduce pipeline?

I also think about this question as about storing a symmetry group. A quick loose reminder of what symmetry group is: a set of "things" (say, rotations of triangle), and a binary operation (say, ...
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Is MapReduce a correct framework for Extract, Transform, Load of data?

EDIT I am working on a project to update a legacy ETL infrastructure that supports a number of clients, each with a slightly different setup. Constraints that cannot be changed: Source data can ...