问题
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?
回答1:
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.
回答2:
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