guozhangwang opened a new pull request, #12244:
URL: https://github.com/apache/kafka/pull/12244

   This is another way of fixing KAFKA-13563 other than #11631.
   
   Instead of letting the consumer to always try to discover coordinator in 
pool with either mode (subscribe / assign), we defer the clearance of discover 
future upon committing async only. More specifically, under manual assign mode, 
there are only three places where we need the coordinator:
   
   1) commitAsync (both by the consumer itself or triggered by caller), this is 
where we want to fix.
   2) commitSync, which we already try to re-discovery coordinator.
   3) committed (both by the consumer itself based on reset policy, or 
triggered by caller), which we already try to re-discovery coordinator.
   
   The benefits are that for manual assign mode that does not try to trigger 
any of the above three, then we never would be discovering coordinator.
   
   
   
   ### Committer Checklist (excluded from commit message)
   - [ ] Verify design and implementation 
   - [ ] Verify test coverage and CI build status
   - [ ] Verify documentation (including upgrade notes)
   


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