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We propose supporting the "cancellation" of an on-going partition rebalance. It is essentially a rollback of a reassignment.
To concretize the notion - a cancellation of a reassignment means stopping any on-going partition movements and restoring the replica set to the one it was prior to the reassignment being initiated.
There is no guarantee that the reverted replica set will be in the same order as it was previously.

kafka-reassign-partitions.sh

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