AnonHxy opened a new issue, #15836:
URL: https://github.com/apache/pulsar/issues/15836

   **Describe the bug**
   `Message.getRedeliveryCount()` is always zero  if subscription type is 
Exclusive or Failove. So we can not take advantage of the `RedeliveryBackoff` 
which use `redeliveryCount` as a parameter.
   
   
    I wander if it's a bug or feature. In other word, why only share or 
key_share subscription type enable subscription message redelivery tracker to 
send redelivery, as Line:84:
   
   
https://github.com/apache/pulsar/blob/b13d15c4d6d795f33c6ed23f920fabbb3eeaf745/pulsar-broker/src/main/java/org/apache/pulsar/broker/service/persistent/PersistentDispatcherSingleActiveConsumer.java#L72-L85
   
   


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