KIP-36 — Rack aware replica assignment

Accepted Broker

Adds a broker.rack configuration and rack-aware replica assignment logic that spreads partition replicas across as many distinct racks as possible when creating or reassigning partitions. Without rack awareness, Kafka's replica placement was purely broker-count-balanced and could place all replicas in the same rack, losing fault isolation for a full rack failure (e.g., an AWS availability zone outage).

Protocol Impact

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