Initiates the asynchronous execution of the DescribeStep operation.

C# |
public IAsyncResult BeginDescribeStep( DescribeStepRequest request, AsyncCallback callback, Object state )

- request (DescribeStepRequest)
- Container for the necessary parameters to execute the DescribeStep 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 EndDescribeStep
operation.
