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It is recommended that the number of consumers in the same group be the same as the number of partitions in the topic to be consumed.
If the number of consumers in a group is greater than the number of partitions in a topic, redundant consumers cannot consume messages in this topic. If the number of consumers is less than the number of partitions in a topic, the concurrent consumption cannot be fully reflected. Therefore, it is recommended that the number of consumers be the same as the number of partitions in a topic.
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