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Kafka Improvement Proposal: Quality of Service (QoS) Framework

Status

Draft

Motivation

Apache Kafka has become the de facto standard for event streaming, with a growing ecosystem of Kafka-compliant services and implementations. While these services conform to the wire protocol, they differ drastically in their Quality of Service (QoS) characteristics—including latency, throughput, elasticity, storage architecture, and observability.

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• KIP-864
• OpenMessaging Benchmark
• RFC 3317: QoS Policy Info Base
• RFC 3644: QoS Information Model

• RFC: Apache Kafka Quality of Service (QoS)

Future Work

• Define a formal grammar (e.g., JSON Schema or protobuf) for QoS metadata
• Add QoS negotiation APIs to Kafka clients
• Integrate QoS metrics into JMX and logging outputs
• Establish community-led working groups for specific QoS dimensions (latency, elasticity, retention, etc.)
• Explore alignment with schema evolution and data contracts

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