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https://issues.apache.org/jira/browse/KAFKA-2939?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17854401#comment-17854401
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Ksolves commented on KAFKA-2939:
--------------------------------

We already use INFO level logging for unused configurations in the 
`AbstractConfig.logUnused()` method. This logging behavior can also be enabled 
via the `log4j.properties` file. Only by setting the logging level to INFO, 
users can ensure that unused configurations are logged.

Example configuration in log4j.properties:
`log4j.logger.org.apache.kafka=INFO`

Do we need to add another property (flag) so that it'll only log if the 
property is enabled and the log type is INFO?

> Make AbstractConfig.logUnused() tunable for clients
> ---------------------------------------------------
>
>                 Key: KAFKA-2939
>                 URL: https://issues.apache.org/jira/browse/KAFKA-2939
>             Project: Kafka
>          Issue Type: Improvement
>          Components: config
>            Reporter: Guozhang Wang
>            Priority: Major
>              Labels: newbie
>
> Today we always log unused configs in KafkaProducer / KafkaConsumer in their 
> constructors, however for some cases like Kafka Streams that make use of 
> these clients, other configs may be passed in to configure Partitioner / 
> Serializer classes, etc. So it would be better to make this function call 
> optional to avoid printing unnecessary and confusing WARN entries.



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