# File lib/fog/aws/requests/rds/promote_read_replica.rb, line 23
        def promote_read_replica(identifier, backup_retention_period = nil, preferred_backup_window = nil)
          params = {}
          params['BackupRetentionPeriod'] = backup_retention_period if backup_retention_period
          params['PreferredBackupWindow'] = preferred_backup_window if preferred_backup_window
          request({
            'Action'               => 'PromoteReadReplica',
            'DBInstanceIdentifier' => identifier,
            :parser                => Fog::Parsers::AWS::RDS::PromoteReadReplica.new
          }.merge(params))
        end