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Major Description
In Fetcher.fetchRecords() we iterate over the partition data to collect the ConsumerRecords, after we collect some consumer records from a partition, we advance the position of that partition then move on to the next partition. If the next partition throws exceptions (e.g. OffsetOutOfRangeException), the messages that have already been read out of the buffer will not be delivered to the users. Since the positions of the previous partitions have been be updated, those messages will not be consumed again either.
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