mongodb - MapReduce or aggregation framework? -


as understand, both aggregation framework , mapreduce have same goal, question is, when should use mapreduce , when aggregation framework?

map reduce long standing aggregation tasks might take anywhere between 10 minutes - 10 hours (or more) complete.

imagine aggregation framework being similar in kind sqls own operators group.

it designed quick inline querying return result however, map reduce larger jobs , not designed inline usage.


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