mjsax commented on PR #22595:
URL: https://github.com/apache/kafka/pull/22595#issuecomment-4748952386

   While digging into more details, I realized that I was a little bit too 
conservative. The existing log to estimate "offsets" and use "zero" (ie, omit) 
an unknown partition is actually sufficient.
   
   In the end, we can re-use the existing `StateDirectory` cache after all -- 
it's refreshed regularly, and it's a concurrent-map, so it's already 
thread-safe. Accessing it directly should be fine, as we don't need "snapshot 
consistency". It also contains data for all tasks. -- The only thing I change 
from "classic" is active-running tasks; as we report them via "currently 
assigned tasks" anyway, and they are caught up be definition, there is no need 
to include them in task-offset-sum IMHO (in the "classic" case, they are 
included with surrogate `offset-sum=-2` ).
   
   Thoughts?


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