eolivelli opened a new pull request, #17241:
URL: https://github.com/apache/pulsar/pull/17241

   ### Motivation
   When you have many subscriptions on the same topic and they are catching up 
(for instance after some downtime of the consumer application) Pulsar will 
start to perform many reads from BK for the same entries.
   
   ### Modifications
   Prevent concurrent reads of the same entries.
   
   ### Verifying this change
   
   This change is already covered by existing tests.
   
   I also tested  manually that with this fix we are reducing a lot the 
pressure on the bookies. This is something we cannot code in a integration test 
as it will use too many resources on CI.
   


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