code: @Override
      public DescribeReservedCacheNodesResult describeReservedCacheNodes(DescribeReservedCacheNodesRequest request) {
          request = beforeClientExecution(request);
          return executeDescribeReservedCacheNodes(request);
      }
docs: <p>
  Returns information about reserved cache nodes for this account, or about a specified reserved cache node.
  </p>
  
  @param describeReservedCacheNodesRequest
  Represents the input of a <code>DescribeReservedCacheNodes</code> operation.
  @return Result of the DescribeReservedCacheNodes operation returned by the service.
  @throws ReservedCacheNodeNotFoundException
  The requested reserved cache node was not found.
  @throws InvalidParameterValueException
  The value for a parameter is invalid.
  @throws InvalidParameterCombinationException
  Two or more incompatible parameters were specified.
  @sample AmazonElastiCache.DescribeReservedCacheNodes
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/elasticache-2015-02-02/DescribeReservedCacheNodes"
  target="_top">AWS API Documentation</a>