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During the rebalance process, each consumer will execute the same deterministic algorithm to range partition a sorted list of topic-partitions over a sorted list of consumer instances. This makes the whole rebalancing algorithm process deterministic. For example, if you only have one partition for a specific topic and going to have two consumers consuming this topic, only one consumer will get the data from the partition of the topic, and event if the consumer named "Consumer1" is registered after the other consumer named "Consumer2", it will replace "Consumer2" gaining the ownership of the partition in the rebalance.

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