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by adimarco 5200 days ago
Its single-threaded nature for map/reduce is its biggest liability in my opintion. It will apparently be fixed in the next version (https://jira.mongodb.org/browse/SERVER-4258)

Right now, large map/reduce operations just bring the thing to its knees. So we just don't map/reduce with it. The query features are really quite nice, and we do the rest in hypertable.