DOCS-189 replsetsyncfrom command and helper documentation

Author: Sam Kleinman

source/reference/commands.txt

@@ -878,6 +878,54 @@ Replication
 
    .. slave-ok, admin-only
 
+.. dbcommand:: replSetSyncFrom
+
+   .. versionadded:: 2.2
+
+   :option host: Specifies the name and port number of the set member
+                 that you want *this* member to sync from. Use
+                 the ``[hostname]:[port]`` form.
+
+   :dbcommand:`replSetSyncFrom` allows you to explicitly configure
+   which host the current :program:`mongod` will pull data from. This
+   operation may be useful for testing different patterns and in
+   situations where a set member is not syncing from the host you
+   want. You may **not** use this command to force a member to sync
+   from:
+
+   - itself.
+   - an arbiter.
+   - a member that does not build indexes.
+   - an unreachable member.
+   - a :program:`mongod` instance that is not a member of the same
+     replica set.
+
+   If you attempt to sync from a member that is more than 10 seconds
+   behind the current member, :program:`mongod` will return and log a
+   warning, but *will* sync from such members.
+
+   The command has the following prototype form:
+
+   .. code-block:: javascript
+
+      { replSetSyncFrom: "[hostname]:[port]" }
+
+   To run the command in the :program:`mongo` shell, use the following
+   invocation:
+
+   .. code-block:: javascript
+
+      db.adminCommand( { replSetSyncFrom: "[hostname]:[port]" } )
+
+   You may also use the :func:`rs.syncFrom()` helper in the
+   :program:`mongo` shell, in an operation with the following form:
+
+   .. code-block:: javascript
+
+      rs.syncFrom([hostname]:[port])
+
+   .. slave-ok, admin-only
+
 Geospatial Commands
 ~~~~~~~~~~~~~~~~~~~
 

source/reference/javascript.txt

@@ -1901,6 +1901,17 @@ Replica Sets
    Returns a basic help text for all of the :doc:`replication
    </core/replication>` related shell functions.
 
+.. function:: rs.syncFrom()
+
+   .. versionadded:: 2.2
+
+   Provides a wrapper around the :dbcommand:`replSetSyncFrom`, which
+   allows administrators to configure the member of a replica set that
+   the current member will pull data from. Specify the name of the
+   member you want to sync from in the form of ``[hostname]:[port]``.
+
+   See :dbcommand:`replSetSyncFrom` for more details.
+
 Native Shell Functions
 ----------------------