Initiates the asynchronous execution of the AddInstanceGroups operation.

C# |
IAsyncResult BeginAddInstanceGroups( AddInstanceGroupsRequest request, AsyncCallback callback, Object state )

- request (AddInstanceGroupsRequest)
- Container for the necessary parameters to execute the AddInstanceGroups operation on AmazonElasticMapReduceClient.
- callback (AsyncCallback)
- An AsyncCallback delegate that is invoked when the operation completes.
- state (Object)
- A user-defined state object that is passed to the callback procedure. Retrieve this object from within the callback procedure using the AsyncState property.

An IAsyncResult that can be used to poll or wait for results, or both; this value is also needed when invoking EndAddInstanceGroups
operation.
