Service-oriented architecture

Amazon's platform is fully service oriented, which means various components in Amazon's ecosystem are exposed as a service for the other services to consume. Each service has to maintain its SLA in order to complete the response accurately and on time. SLA is a Service Level Agreement where a service agrees to provide a response within the said time for a said number of requests per second. In Amazon's service-oriented architecture, it is very important for services to maintain the agreement, as Amazon's request response engine builds the response dynamically by combining the results from many services. Even to answer a single request on Amazon's e-commerce website, hundreds of services come together to form the response.

In the following diagram, the request comes from the web via Amazon's e-commerce platform, which is then forwarded to various services to get the appropriate data from DynamoDB. Data transfer happens in DynamoDB...