MarvinCai edited a comment on pull request #11216:
URL: https://github.com/apache/pulsar/pull/11216#issuecomment-915911193


   @hrsakai 
   exposed an API from ManagedCursor that can calculate un-acked messages 
between MarkDeletePosition and a given position, which will allow us to 
calculate message that'll be acked by a cumulative acked request thus adjust 
pendingMessage number.
   then there's no need to sync producer as we just need to make sure 
MarkDeletePosition doesn't change during cumulative ack.
   Please take another look.


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