LuciferYang edited a comment on pull request #34870:
URL: https://github.com/apache/spark/pull/34870#issuecomment-992082983
@dongjoon-hyun There are some Maven plugin will also implicitly introduce
lower versions of `log4j2`, like scala-maven-plugin, the import relationship is
as follows:
```
net.alchim31.maven:scala-maven-plugin:4.3.0 ->
org.scala-sbt:zinc_2.12:1.3.1 ->
org.scala-sbt:zinc-core_2.12:1.3.1 ->
org.scala-sbt:zinc-apiinfo_2.12:1.3.1 ->
org.scala-sbt:zinc-classfile_2.12:1.3.1 ->
org.scala-sbt:util-logging_2.12:1.3.0 ->
org.apache.logging.log4j:log4j-core:2.11.2
```
But there are comments here telling us not to upgrade scala-maven-plugin:
```
<!-- SPARK-36547: Please don't upgrade the version below, otherwise there
will be an error on building Hadoop 2.7 package -->
```
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