lhotari commented on PR #23267:
URL: https://github.com/apache/pulsar/pull/23267#issuecomment-2345777428

   > Is there a precise step to reproduce the acknowledgment lost?
   
   @aloyszhang not yet, there's #22709 and #21958 where it seems that acks get 
lost. 
   
   One possible way that it could happen is due to #23200 where the number of 
ack holes exceeds the default limit of 10000 and the consumer gets reconnected 
at this time (client connection breaks or due to load balancing event). 
   There was a previous attempt to limit the number of ack holes with PIP-299. 
The problem is that it won't prevent exceeding the limit. The problem described 
in #23200 is addressed with #23231 (which I'm currently working on).


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