[GitHub] [kafka] RivenSun2 commented on pull request #12041: MINOR: ignore unused configuration when ConsumerCoordinator is not constructed

[GitBox]

RivenSun2 commented on PR #12041:
URL: https://github.com/apache/kafka/pull/12041#issuecomment-1099797049

   In other words, for a configuration (including `unknownConfig`), if neither 
Kafka nor the user retrieves this configuration when the KafkaClient completes 
initialization, the log prompt will only be printed.
   
   Kafka is responsible for retrieving all `knownConfigs`, just like the 
`transactional.id` configuration, it will be used whether the user has passed 
in `transactional.id` or not.
   
   ```
               String transactionalId = 
config.getString(ProducerConfig.TRANSACTIONAL_ID_CONFIG);
   
               this.clientId = 
config.getString(ProducerConfig.CLIENT_ID_CONFIG);
   ```
   


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