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In this scenario, if auto commit is enabled, we would commit offsets from buffer2 directly into the original commit log. Meanwhile, the offsets found in buffer1 will be checkpointed in another Kafka topic. When calling KafkaConsumer#fetchCommittedOffsets or calling KafkaConsumer#committed, if consumer2 has not terminated, then only offsets checkpointed by consumer2 will be sent. Otherwise, the offsets checkpointed by consumer1 will be returned instead.

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