showuon commented on pull request #11800:
URL: https://github.com/apache/kafka/pull/11800#issuecomment-1051554030


   > However, after valuesWithPrefixOverride.get("sasl.mechanism") add 
assertFalse(config.unknown().contains("prefix.sasl.mechanism"));,
   testCase will fail to verify; because unknownKeys is only affected by 
originals and values, the value is originalKeys.removeAll(valueKeys).
   
   So, could we also remove `used` config keys for `unknown` configs? 
Otherwise, there would be this strange case that a config is `used`, but 
`unknown` to kafka. 
   
   Thanks.


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