KIP-1335 — Bounded concurrency for partition reassignment via kafka-reassign-partitions.sh

Discussion AdminBroker

Adds tool-only pacing controls to kafka-reassign-partitions.sh --execute: --reassignment-batch-size caps how many partitions are submitted per step, --incremental keeps at most N reassignments in flight from a deterministic (topic, partition) queue, and --reassignment-poll-interval-ms controls polling between submissions, all built on existing alterPartitionReassignments/listPartitionReassignments Admin calls with no broker or controller changes. Today the tool submits the entire reassignment JSON in a single AdminClient call, so large plans burst replication traffic and controller work, and --throttle bounds bandwidth but not how many partitions move simultaneously, forcing operators to hand-split JSON files or wrap the tool in ad hoc scripts.

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