[GitHub] sijie commented on issue #3382: What's purpose of ackId when publishing to a topic ?

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sijie commented on issue #3382: What's purpose of ackId when publishing to a topic ? 
URL: https://github.com/apache/pulsar/issues/3382#issuecomment-457464626
 
 
   @kamal-brill ackId (aka message id) is used for consumer to acknowledge it has received and processed the message. once a message is acknowledged, the message will not be delivered again. You can read the documentation here: http://pulsar.apache.org/docs/en/concepts-messaging/#acknowledgement

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