KIP-6 — New reassignment partition logic for rebalancing

Discussion AdminBroker

Proposes improved partition reassignment logic for the kafka-reassign-partitions.sh tool that accounts for the existing replica assignment when adding brokers, rather than computing a fresh from-scratch assignment. The original generate command redistributed all partitions as if they were newly created, causing excessive data movement when only incremental balancing across newly added brokers was needed.

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