Thanks for answering my questions. Now I know why the offset is saved in 
zookeepers.
If a consumer group has only one consumer, when it fails and restarts, I assume 
it starts
consuming from the offset saved in the zookeeper. Is that right?
If that is the case, then the consumer client does not need to worry about 
duplicate
Messages. Is there any chance that messages will be lost ?






Regards,

Libo

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