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lines changed Original file line number Diff line number Diff line change @@ -42,6 +42,17 @@ commands when starting :ref:`mongosync <c2c-mongosync>`:
4242To start the sync operation between the source clusters and the
4343destination cluster, see :ref:`c2c-quickstart-synchronize`.
4444
45+ When beginning your sync operation for a many-to-one migration, add
46+ the following parameter to the :ref:`/start <c2c-api-start>` requests: 
47+ 
48+ .. code:: 
49+ 
50+    "destinationDataHandling": "ignorePreExistingNamespaces"
51+ 
52+ Setting ``"destinationDataHandling"`` to ``"ignorePreExistingNamespaces"`` 
53+ allows each migration to write to the destination cluster that may have 
54+ pre-existing namespaces from the other many-to-one migrations.
55+ 
4556Behavior 
4657--------
4758
    
 
   
 
     
   
   
          
     
  
    
     
 
    
      
     
 
     
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