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An Amazon Relational Databases Services (Amazon RDS) Read Replica of customer and order databases is used by Amazon Elastic MapReduce(Amazon EMR) to compute user profiles and by Amazon Simple Email Service (Amazon SES) to send targeted marketing emails to customers.
Log files produced by the e-commerce web front end have been stored on Amazon Simple Storage Service (Amazon S3) and are consumed by the Amazon EMR cluster to compute user profiles.
A recommendation web service used by the web front end is deployed by AWS Elastic Beanstalk. This service uses the profile information stored on Amazon DynamoDB to provide personalized recommendations to be shown on the e-commerce web front end.