lhotari commented on PR #22799:
URL: https://github.com/apache/pulsar/pull/22799#issuecomment-2293220346

   Btw. I'm currently investigating a Key_Shared subscription type issue where 
ordinary consumption of message leads to a very large number of "ack holes". 
The WIP test app where this is reproduced is 
https://github.com/lhotari/pulsar-playground/blob/master/src/main/java/com/github/lhotari/pulsar/playground/TestScenarioIssueKeyShared.java
 .
   The test class is not yet simplified to contain the relevant parts. I 
started with a very complex test case and it seems that the "ack hole" problem 
shows up in all possible cases. 
   
   No messages get lost. It's just that some messages don't get delivered until 
all other messages have been processed.
   
   


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