ppkarwasz commented on code in PR #17373:
URL: https://github.com/apache/kafka/pull/17373#discussion_r1898304621
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build.gradle:
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@@ -1099,15 +1103,17 @@ project(':core') {
implementation libs.dropwizardMetrics
exclude module: 'slf4j-log4j12'
exclude module: 'log4j'
- // Both Kafka and Zookeeper use slf4j. ZooKeeper moved from log4j to
logback in v3.8.0, but Kafka relies on reload4j.
+ // Both Kafka and Zookeeper use slf4j. ZooKeeper moved from log4j to
logback in v3.8.0.
// We are removing Zookeeper's dependency on logback so we have a
singular logging backend.
exclude module: 'logback-classic'
exclude module: 'logback-core'
}
// ZooKeeperMain depends on commons-cli but declares the dependency as
`provided`
implementation libs.commonsCli
-
- compileOnly libs.reload4j
+ implementation libs.log4j2Core
+ implementation libs.log4j2Api
+ implementation libs.log4j1Bridge2Api
+ implementation libs.jacksonDatabindYaml
Review Comment:
IMHO the `kafka_<scala_version>` artifact should not have these
dependencies, these dependencies should be added **only** to the binary Kafka
distribution. Otherwise Kafka will leak the Log4j Core dependencies to its
consumers, similarly to what was happening with Zookeeper (see
[ZOOKEEPER-4820](https://issues.apache.org/jira/browse/ZOOKEEPER-4820)).
To add dependencies only to the binary distribution, you could use something
similar to apache/eventmesh#4719, i.e. a separate `distOnly` Gradle
configuration.
`Log4jController` can be rewritten to use Log4j Core if present or a no-op
implementation otherwise, so the Log4j Core can be declared as an [optional
Gradle dependency](https://blog.gradle.org/optional-dependencies).
**Note**: I am working on a `org.apache.logging:logging-admin` artifact (see
[`ppkarwasz/logging-admin` repo](https://github.com/ppkarwasz/logging-admin))
that would provide the same functionality as `Log4jController`, but in a
logging implementation independent way. Unfortunately I have a long TODO list
before I can publish it, so probably it won't be ready for Kafka 4.
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