lhotari commented on issue #23845:
URL: https://github.com/apache/pulsar/issues/23845#issuecomment-3206821109

   > We encountered a similar issue on version 4.0.6. Messages may not be 
delivered when adding or removing consumers (such as during restarts of our 
service pods). Messages get stuck and are not delivered. The only workaround is 
to unload the topic, after which the messages are successfully delivered.
   > 
   > What information would you need in order to try to help resolve this 
problem? And are there any recommended settings to prevent inReplay messages 
from appearing? Thank you.
   
   @tarmacmonsterg Please see 
https://pulsar.apache.org/docs/4.0.x/concepts-messaging/#troubleshooting-issues-when-message-delivery-is-blocked-for-a-key-in-key_shared-subscriptions-auto_split-mode
 for investigating the issue. It's intentional that message delivery is blocked 
for key hashes that are "draining" and all outstanding messages haven't been 
acknowledged. There's more details in the PIP-379 design document, 
https://github.com/apache/pulsar/blob/master/pip/pip-379.md . 


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