lhotari commented on issue #21958:
URL: https://github.com/apache/pulsar/issues/21958#issuecomment-2330962995

   > let me check tomrrow.
   
   @semistone thanks, that you be helpful. If it reproduces only within a 
cluster with multiple nodes and other traffic that could mean that a load 
balancing event is triggering the problem. Currently in-flight acknowledgements 
could get lost when this happens. Usually this gets recovered, but it's 
possible that there's a race condition where the acknowledgements get lost and 
the message doesn't get redelivered during the unload/reconnection event 
triggered by load balancing. It should be possible to simulate this scenario 
also by triggering topic unloads with the admin api.


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