KIP-120 — Cleanup Kafka Streams builder API

Accepted Kafka 1.0 Streams

Deprecates TopologyBuilder and KStreamBuilder and replaces them with Topology and StreamsBuilder in the org.apache.kafka.streams package, and adds a TopologyDescription interface for inspecting the processor graph. The old classes leaked internal DSL methods on the processor API builder and mixed DSL and PAPI abstractions, making the public API inconsistent and hard to evolve.

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