Architectural Patterns

Competing consumers pattern

With the surging popularity of web-scale applications, there can be a large number of requests from different parts of the world for those applications. The user and data loads are generally unpredictable. The task/operation complexity is also unpredictable. Because of heavy loads, cloud applications find it difficult to process every request and deliver the reply within the stipulated timeline. One option is to add new server instances. There are some practical difficulties in clustered and load-balanced environments too. However, these consumers must be coordinated to ensure that each message is only delivered to a single consumer. The workload also needs to be load balanced across consumers to prevent an instance ...