coderzc commented on issue #21074:
URL: https://github.com/apache/pulsar/issues/21074#issuecomment-1695470554

   It seems to be the same issue as what I said above. If the topic unloads or 
the broker restarts, the consumer will reconnect to the broker and start 
reading data from the earliest position again, even if you already acknowledged 
some messages. 
   
   Also, this issue may also occur during the compaction process, and it will 
cause compacted data to have duplicate messages.
   
   @michalcukierman Can you see if the number of compacted entries is greater 
than the total number of messages published?


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