david-streamlio commented on pull request #9406:
URL: https://github.com/apache/pulsar/pull/9406#issuecomment-771683157


   @sijie An example use case would be an S3 source connector that uses SQS to 
get event notifications of changes rather than scanning the entire S3 bucket 
for changes.  
https://docs.aws.amazon.com/AmazonS3/latest/dev/NotificationHowTo.html
   
   In such a scenario, the discover phase of the source would connect to the 
SQS queue as described 
[here](https://docs.aws.amazon.com/AmazonS3/latest/dev/ways-to-add-notification-config-to-bucket.html),
 and only need to execute once. 


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