KIP-1255 — Remote Read Replicas for Kafka Tiered Storage

Discussion Tiered StorageBroker

Proposes a Remote Read Replica (RRR) broker role that serves historical reads exclusively from tiered remote storage, decoupling cold-read traffic from hot-path leader/ISR brokers and enabling per-AZ RRR deployments to reduce cross-AZ latency and cost. Leader replicas currently handle all reads regardless of data age, causing I/O contention, elevated local storage requirements, and cross-AZ fetch costs for consumers reading historical offsets from tiered storage.

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