Choreographed microservices talk to each other asynchronously, blindly broadcasting notifications into a service cloud. Those notifications are handled by whatever client services are interested. These systems eliminate many of the problems associated with orchestrated systems (which work more like synchronous function calls) and are typically much faster than orchestrated systems, but they have their own idiosyncrasies and implementation challenges.
Allen Holub explores the inherent problems in orchestrated systems and explains how choreography can solve those problems. Allen outlines three approaches to choreography: HTTP based, pub/sub messaging based, and brokerless swarming systems. He also details appropriate messaging architectures and frameworks and shares several practical examples.
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