Event Driven Microservices Patterns

Uber, Gilt and others have moved from a monolithic to a microservices architecture because they needed to scale. A monolithic application puts all of its functionality into a single process, scaling requires replicating the whole application, which has limitations. Sharing normalized tables in a clustered RDBMS does not scale well because distributed transactions and joins can cause concurrency bottlenecks. The microservice architectural style is an approach to developing an application as a suite of small independently deployable services built around specific business capabilities. A microservices approach is well aligned to a typical big data deployment.