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https://issues.apache.org/jira/browse/KAFKA-16936?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17855156#comment-17855156
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Chia-Ping Tsai commented on KAFKA-16936:
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[~gharris1727] thanks for raising this great discussion.
{quote}Is this not true for slf4j 2.x? Will users with log4j 1.x in their
distributions still work with slf4j 2.x?
{quote}
It seems to me the answer is YES. Strictly speaking, we are still using log4j
1.x rather than log4j 2.x, since the default provided is still reload4j.
1. reload4j is drop-in replacement for log4j version 1.2.17, so the
compatibility is not a issue [0]
2. the binary compatibility declared by slf4j [1] is "ensure that the version
of your provider/binding matches that of the slf4j-api.jar.", and hence we can
have backward compatibility if both "slf4j-api" and "slf4j-reload4j" have same
version
[0] [https://reload4j.qos.ch/]
[1] [https://www.slf4j.org/manual.html#compatibility]
> Upgrade slf4k to 2.0.9 and integrate "-Dslf4j.provider" to kafka script
> -----------------------------------------------------------------------
>
> Key: KAFKA-16936
> URL: https://issues.apache.org/jira/browse/KAFKA-16936
> Project: Kafka
> Issue Type: New Feature
> Reporter: Chia-Ping Tsai
> Assignee: Muralidhar Basani
> Priority: Major
>
> origin discussion:
> [https://github.com/apache/kafka/pull/16260#issuecomment-2159632052]
> The specific provider class can be defined by `slf4j.provider`[0]. Hence, we
> can add the slf4j backends we care about to dependencies. With that, our
> distributions will have different slf4j backends and it is safe as we will
> define slf4j.provider in our script. Also, those slf4j backends will be
> collected to "dependend-libs", and hence we can run kafka instance from
> source code with specific provider too.
> In short, the following tasks are included by this jira
> 1. upgrade slf4j from 1.7.36 to 2.0.9+
> 2. add a new system variable to script to define -Dslf4j.provider easily. By
> default we use org.slf4j.reload4j.Reload4jServiceProvider
> 3. add other slf4j backend dependencies (optional)
> [0] https://www.slf4j.org/manual.html
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