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DOCS-14301 address chunk balancing changes #5304

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May 7, 2021
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DOCS-14301 address chunk balancing changes #5304

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18 changes: 11 additions & 7 deletions source/reference/command/split.txt
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Expand Up @@ -15,13 +15,17 @@ Definition

.. dbcommand:: split

Splits a :term:`chunk` in a :term:`sharded cluster` into two
chunks. The :binary:`~bin.mongos` instance splits and manages
chunks automatically, but for exceptional circumstances the
:dbcommand:`split` command does allow administrators to manually
create splits. See :doc:`/tutorial/split-chunks-in-sharded-cluster` for
information on these circumstances, and on the MongoDB shell commands
that wrap :dbcommand:`split`.
.. versionchanged:: 4.2

Splits a :term:`chunk` in a :term:`sharded cluster` into two chunks.
Starting in MongoDB 4.2, shards manage and split chunks based on the
chunk size statistics they maintain.

For exceptional circumstances the :dbcommand:`split` command does
allow administrators to manually create splits. See
:doc:`/tutorial/split-chunks-in-sharded-cluster` for information on
these circumstances, and on the MongoDB shell commands that wrap
:dbcommand:`split`.

The :dbcommand:`split` command must be run in the ``admin`` database
and uses the following form:
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