chickenchickenlove commented on PR #22473:
URL: https://github.com/apache/kafka/pull/22473#issuecomment-4659052524

   @dajac 
   
   > Do we have a similar issue on the classic path to consumer group?
   
   I think this issue is specific to the `ConsumerGroupHeartbeat` static 
temporary leave path. That path retains the member by writing a current 
assignment record with member epoch -2.
   
   I think that `ClassicGroup` uses a different model. It does not track 
`UNREVOKED_PARTITIONS` / `UNRELEASED_PARTITIONS` or 
partitionsPendingRevocation, and explicit LeaveGroup removes the member from 
the classic group...!
   
   What do you think?


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