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https://issues.apache.org/jira/browse/KAFKA-18831?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17928457#comment-17928457
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TengYao Chi commented on KAFKA-18831:
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I will file a patch to add this to the 4.0 notable change section.
> Document the behavior changes of adjusting logger level after migrating to
> log4j2
> ---------------------------------------------------------------------------------
>
> Key: KAFKA-18831
> URL: https://issues.apache.org/jira/browse/KAFKA-18831
> Project: Kafka
> Issue Type: Improvement
> Reporter: Chia-Ping Tsai
> Assignee: Chia-Ping Tsai
> Priority: Blocker
> Fix For: 4.0.0
>
>
> There are two behavior changes introduced by log4j 2
> 1)
> in log4j 1, users can't change the logger by parent if the logger is declared
> by properties explicitly. For example, `org.apache.kafka.controller` has
> level explicitly in the properties. Hence, we can't use
> "org.apache.kafka=INFO" to change the level of `org.apache.kafka.controller`
> to INFO. By contrast, log4j2 allows us to change all child loggers by the
> parent logger.
> 2) in log4j2, we can change the level of root to impact all loggers' level.
> By contrast, log4j 1 can't.
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