code: @Override
      public DescribeReservedNodesResult describeReservedNodes(DescribeReservedNodesRequest request) {
          request = beforeClientExecution(request);
          return executeDescribeReservedNodes(request);
      }
docs: <p>
  Returns the descriptions of the reserved nodes.
  </p>
  
  @param describeReservedNodesRequest
  @return Result of the DescribeReservedNodes operation returned by the service.
  @throws ReservedNodeNotFoundException
  The specified reserved compute node not found.
  @throws DependentServiceUnavailableException
  Your request cannot be completed because a dependent internal service is temporarily unavailable. Wait 30
  to 60 seconds and try again.
  @sample AmazonRedshift.DescribeReservedNodes
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/redshift-2012-12-01/DescribeReservedNodes" target="_top">AWS
  API Documentation</a>