Provides information about the cluster instances that Amazon EMR provisions on behalf
            of a user when it creates the cluster.          For example, this operation indicates
            when the EC2 instances reach the Ready state, when instances become available to Amazon
            EMR to use for jobs, and the IP addresses for cluster instances, etc.
            
 Declaration Syntax
 Declaration Syntax| C# | 
ListInstancesResponse ListInstances()
 Return Value
 Return ValueThe response from the ListInstances service method, as returned by ElasticMapReduce.
 Exceptions
 Exceptions| Exception | Condition | 
|---|---|
| InternalServerException | This exception occurs when there is an internal failure in the EMR service. | 
| InvalidRequestException | This exception occurs when there is something wrong with user input. |