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https://issues.apache.org/jira/browse/KAFKA-18831?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Chia-Ping Tsai resolved KAFKA-18831.
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Resolution: Fixed
trunk:
https://github.com/apache/kafka/commit/d31cbf59dee6a77c1c673db06900ecc238894ed7
4.0:
https://github.com/apache/kafka/commit/d3791c39e3e426161ea4f8fd95ca3c97b049dd95
> Migrating to log4j2 introduce behavior changes of adjusting level dynamically
> -----------------------------------------------------------------------------
>
> Key: KAFKA-18831
> URL: https://issues.apache.org/jira/browse/KAFKA-18831
> Project: Kafka
> Issue Type: Bug
> Reporter: Chia-Ping Tsai
> Assignee: TengYao Chi
> 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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