massakam commented on pull request #182:
URL: 
https://github.com/apache/pulsar-client-node/pull/182#issuecomment-986555301


   @rickyes Sorry, [this 
comment](https://github.com/apache/pulsar-client-node/pull/182#issuecomment-986538154)
 is incorrect. It seems that `MessageListener` is not triggered until the 
execution of `subscribeCallback` is completed.
   
   `subscribeCallback` is executed on the following line in the C++ client 
library. And the C++ client will not start receiving messages until this method 
completes.
   
https://github.com/apache/pulsar/blob/a54c6c003c626cb16d90200ad81dd3ec37be2133/pulsar-client-cpp/lib/ClientConnection.cc#L877


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