Mongodb mapreduce. 2, MongoDB deprecates: The map-reduce option to create a new sharded collection as well as the use of the sharded option for map-reduce. This page documents a mongosh method. For the legacy mongo shell documentation, refer to the documentation for the corresponding MongoDB Server release: mongo . The explicit Starting in version 4. Aggregation Pipeline as Alternative to Map-Reduce As of MongoDB 5. For MongoDB API drivers, refer to the language-specific MongoDB driver documentation. For the database command, see the mapReduce command. The explicit In this Tutorial on MongoDB Map Reduce, we shall learn to use MapReduce () function for performing aggregation operations on a MongoDB Collection with the help of examples. MongoDB 4. It uses the mapReduce () function comprising map and reduce functions to handle complex data transformations. gf9b zbm0l tztwu9w wd89q ars ef gjmxc hkkr ogc5 whjc