lujiwen opened a new issue, #15948:
URL: https://github.com/apache/pulsar/issues/15948

   **Describe the bug**
   the msgBacklog is not accurate after restarts and ask for msgBacklog for 
subscription even specify --get-precise-backlog
   
   **To Reproduce**
   Steps to reproduce the behavior:
   1. get msgBacklog by 'pulsar-admin topics partitioned-stats 
--get-precise-backlog --get-subscription-backlog-size "
   alias ts="pulsar-admin topics stats --get-precise-backlog 
--get-subscription-backlog-size'
   2. restart broker 
   3. request for backlog again, or consume msg in a particular subscirption
   4. we can consume more message than the 'msgBacklog'
   
   **Expected behavior**
   the msgBacklog can indicates the precise backlog in a subscription in any 
case.
   
   


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