What are three built-in abstractions in the Kafka Streams DSL?

The Kafka Streams DSL provides three primary abstractions:

KStream: Represents an unbounded stream of records (append-only).

KTable: Represents a changelog stream where each key has the latest value (like a materialized view).

GlobalKTable: A fully replicated version of KTable across all stream instances, enabling global joins.

From Kafka Streams Developer Guide:

“Kafka Streams provides three core abstractions: KStream, KTable, and GlobalKTable, each serving different purposes in stream processing and joins.”

GlobalKStream and StreamTable do not exist in Kafka’s API.