Change Data Capture, popularly abbreviated as CDC, is a data pattern that informs external systems when records are inserted, modified, or deleted in a database. It is extensively used for building event stream processing (ESP) systems. In Aerospike, CDC is known as Change Notification, which uses Aerospike’s Cross-Datacenter Replication (XDR) to publish changes as they occur. As a member of the Connect product line, Aerospike Connect for ESP converts change notifications over XDR into HTTP requests and streams them to downstream consumers,