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DOCS-2225: Mention size limit of reduce #1998

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DOCS-2225: Mention size limit of reduce #1998

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5 changes: 5 additions & 0 deletions source/includes/parameters-map-reduce.rst
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Expand Up @@ -88,6 +88,11 @@ The ``reduce`` function exhibits the following behaviors:
- The ``reduce`` function can access the variables defined
in the ``scope`` parameter.

- The inputs to ``reduce`` must not be larger than half of MongoDB's
:ref:`maximum BSON document size <limit-bson-document-size>`. This
requirement may be violated when large documents are returned and then
joined together in subsequent ``reduce`` steps.

Because it is possible to invoke the ``reduce`` function
more than once for the same key, the following
properties need to be true:
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