Unlike NiFi (the flow management service of the HDF platform), Streaming Analytics Manager requires a schema for stream apps. More specifically, every Builder component requires a schema to function.
The primary data stream source is Kafka, which uses the HDF Schema Registry.
The Builder component for Apache Kafka is integrated with the Schema Registry. When you configure a Kafka source and supply a Kafka topic, Streaming Analytics Manager calls the Schema Registry. Using the Kafka topic as the key, Streaming Analytics Manager retrieves the schema. This schema is then displayed on the tile component, and is passed to downstream components.