Keystone Stream Processing Platform is Netflix’s data backbone and an essential piece of infrastructure that enables engineering data-driven culture. 

Today, the Keystone platform offers two production services:

• Data Pipeline: streaming enabled Routing Service and Kafka enabled Messaging Service, together is responsible for producing, collecting, processing, aggregating, and moving all microservice events in near real-time.
• Stream Processing as a Service (SPaaS): enables users to build & operate custom managed stream processing applications, allowing them to focus on business application logic while platform provides the scale, operations, and domain expertise.

Anatomy of a single streaming job:

Link to quiz Beginners Quiz