Set the reducer.
            
 Declaration Syntax
 Declaration Syntax| C# | 
[ObsoleteAttribute("The With methods are obsolete and will be removed in version 2 of the AWS SDK for .NET. See http://aws.amazon.com/sdkfornet/#version2 for more information.")] public StreamingStep WithReducer( string reducer )
 Parameters
 Parameters- reducer (String)
- The reducer.
 Return Value
 Return ValueA reference to this updated object so that method calls can be chained
            together.