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DOCS-17460 Add deprecation warning for map reduce #5712

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Aug 20, 2021
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DOCS-17460 Add deprecation warning for map reduce #5712

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3 changes: 3 additions & 0 deletions source/includes/fact-use-aggregation-not-map-reduce.rst
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@@ -1,3 +1,6 @@
As of MongoDB 5.0 the :doc:`map-reduce</core/map-reduce>`
operation is deprecated.

An :doc:`aggregation pipeline </core/aggregation-pipeline>` provides
better performance and usability than a :doc:`map-reduce
</core/map-reduce>` operation.
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10 changes: 10 additions & 0 deletions source/release-notes/5.0.txt
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Expand Up @@ -86,6 +86,16 @@ measurements over a period of time. Compared to normal collections,
storing time series data in time series collections improves query
efficiency and reduces disk usage for your data and indexes.

Deprecate Map Reduce Operation
------------------------------

Starting in version 5.0, MongoDB deprecates the
:doc:`map-reduce</core/map-reduce>` operation.

For examples of aggregation pipeline alternatives to map-reduce
operations, see :doc:`/reference/map-reduce-to-aggregation-pipeline` and
:doc:`/tutorial/map-reduce-examples`.

Aggregation
-----------

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