I was googling and reading Kafka documentation but I couldn't find out the max value of a consumer offset and whether there is offset wraparound after max value. I understand offset is an Int64 value so max value is 0xFFFFFFFFFFFFFFFF. If there is wraparound, how does Kafka handle this situation?
According to this post, the offset is not reset:
We don't roll back offset at this moment. Since the offset is a long, it can last for a really long time. If you write 1TB a day, you can keep going for about 4 million days.
Plus, you can always use more partitions (each partition has its own offset).
So as Luciano said, probably not worth worrying about.
It seems that this is not really "handled". But, taking into account that the offset is per partition, it seems this is something we should not worry about :)
Please see http://search-hadoop.com/m/uyzND1uRn8D1sSH322/rollover/v=threaded
来源：https://stackoverflow.com/questions/34408970/kafka-consumer-offset-max-value