Status

Current state:  Under DiscussionAccepted

Discussion thread: thread

JIRA: KAFKA-12399

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1. Deprecate log4j-appender

If the user tries to use the log4j-appender, it will display a following warning message:

log4j-appender is deprecated and will be removed in a future release. For migration, please refer to the latest documentation.

2. Remove dependency on log4j-appender from the project

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The leaving modules (tools, trogdor, shell) 's slf4j, log4j 1.x dependencies will be upgraded into log4j2 and additional log4j2 configuration file will be provided. For backward compatibility, these tools will use the log4j configuration file (tools-log4j2log4j.properties) by default. But for informational purpose, the following message will be shown when user launches kafka-run-class.sh:

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