DOCS-14644-assert CWWC is set on server start | DOCS-14643 on sh.addShard

Author: ianf-mongodb

source/includes/fact-5.1-fassert-shard-restart-add-CWWC.rst

@@ -0,0 +1,12 @@
+Starting in MongoDB 5.1, when starting, restarting or adding a
+:doc:`shard server</sharding>` with :method:`sh.addShard()` the
+:ref:`Cluster Wide Write Concern (CWWC) <set_global_default_write_concern>` 
+must be set.
+
+If the ``CWWC`` is not set and the shard is configured
+such that the :ref:`default write concern <write-concern>` is 
+``{ w : 1 }`` the shard server will fail to start or be added 
+and returns an error.
+
+See :ref:`default write concern calculations <default-wc-formula>` for 
+details on how the default write concern is calculated.

source/reference/mongodb-defaults.txt

@@ -215,6 +215,8 @@ Write Concern
    :alt: Read/Write Concern Inheritance
    :figwidth: 500px
 
+.. _default-wc-formula:
+
 Default Write Concern
 ~~~~~~~~~~~~~~~~~~~~~
 

source/release-notes/5.1-compatibility.txt

@@ -74,6 +74,11 @@ Removed Metrics
 Replica Sets
 ------------
 
+Assert Cluster Wide Write Concern is Set When Starting or Adding Shard
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+.. include:: /includes/fact-5.1-fassert-shard-restart-add-CWWC.rst
+
 ``rs.reconfig`` Cluster Wide Write Concern Validation
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 

source/release-notes/5.1.txt

@@ -191,6 +191,11 @@ For an example, see :ref:`validation-description-example`.
 Replica Sets
 ------------
 
+Assert Cluster Wide Write Concern is Set When Starting or Adding Shard
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+.. include:: /includes/fact-5.1-fassert-shard-restart-add-CWWC.rst
+
 ``rs.reconfig`` Cluster Wide Write Concern Validation
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 

source/sharding.txt

@@ -237,6 +237,8 @@ a :ref:`broadcast operation <sharding-mongos-broadcast>`, querying
 *all* shards in the sharded cluster. These scatter/gather queries can
 be long running operations.
 
+.. include:: /includes/fact-5.1-fassert-shard-restart-add-CWWC.rst
+
 .. note::
 
    If you have an active support contract with MongoDB, consider contacting