shibd commented on issue #16716:
URL: https://github.com/apache/pulsar/issues/16716#issuecomment-1192108717

   This is related to the function framework.
   
   When Guarantees == ATMOST_ONCE and autoAck == true,  The message will be ack 
before it enters sink connector.
   
   In other cases auto-ack has no effect on the sink connector, the sink 
connector needs to ack himself.
   
   auto-ack is a confusing configuration, you can see this 
[PIP-166](https://github.com/apache/pulsar/issues/15560), it will plan 
deprecated that config.
   
   


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