kevin-wu24 commented on PR #20859:
URL: https://github.com/apache/kafka/pull/20859#issuecomment-3589283023

   > Does it count for the initial controllers or not? Does it count for 
manually join?
   Yes for both. When handling an auto-join `AddVoterRPC`, the leader will 
check its voter set history if the requesting `ReplicaKey` was part of it. 
   
   Maybe a better documentation is that new controllers (node id + directory 
UUID tuples) will automatically join the KRaft voter set once if they are not 
already a voter.


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