From the link: "Keystone - Processing over 550 billion events per day with 8 million events & 17 GB per second peaks, and at-least once processing semantics.

From the link: "Keystone - Processing over 550 billion events per day with 8 million events & 17 GB per second peaks, and at-least once processing semantics. We will explore in detail how we employ Samza, Kafka, and Docker at scale to implement this pipeline."