# File lib/ec2/right_ec2_spot_instances.rb, line 254
    def create_spot_datafeed_subscription(bucket, prefix=nil)
      request_hash = { 'Bucket' => bucket }
      request_hash['Prefix'] = prefix unless prefix.blank?
      link = generate_request("CreateSpotDatafeedSubscription", request_hash)
      request_info(link, QEc2DescribeSpotDatafeedSubscriptionParser.new(:logger => @logger))
    end