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Is the aggregation framework introduced in mongodb 2.2, has any special performance improvements over map/reduce?
If yes, why and how and how much?
(Already I have done a test for myself, and the performance was nearly same)
Every test I have personally run (including using your own data) shows aggregation framework being a multiple faster than map reduce, and usually being an order of magnitude faster.
Just taking 1/10th of the data you posted (but rather than clearing OS cache, warming the cache first – because I want to measure performance of the aggregation, and not how long it takes to page in the data) I got this:
MapReduce: 1,058ms
Aggregation Framework: 133ms
Removing the $match from aggregation framework and {query:} from mapReduce (because both would just use an index and that’s not what we want to measure) and grouping the entire dataset by key2 I got:
MapReduce: 18,803ms
Aggregation Framework: 1,535ms
Those are very much in line with my previous experiments.