[GitHub] [spark] eejbyfeldt edited a comment on pull request #35811: [SPARK-38516][BUILD] Add log4j-core, log4j-api and log4j-slf4j-impl to classpath if active hadoop-provided

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eejbyfeldt edited a comment on pull request #35811:
URL: https://github.com/apache/spark/pull/35811#issuecomment-1064855439


   I built this branch with ` ./dev/make-distribution.sh --tgz --name hadoop-provided-test -Phadoop-provided -Pyarn` and then run `org.apache.spark.examples.SparkPi` example with hadoop 3.3.2. That example job runs fine but I do get slf4j warnigns regarding multiple bindings:
   ```
   SLF4J: Class path contains multiple SLF4J bindings.
   SLF4J: Found binding in [jar:file:../spark-3.3.0-SNAPSHOT-bin-hadoop-provided-test/jars/log4j-slf4j-impl-2.17.1.jar!/org/slf4j/impl/StaticLoggerBinder.class]
   SLF4J: Found binding in [jar:file:../hadoop-3.3.2/share/hadoop/common/lib/slf4j-log4j12-1.7.30.jar!/org/slf4j/impl/StaticLoggerBinder.class]
   SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
   SLF4J: Actual binding is of type [org.apache.logging.slf4j.Log4jLoggerFactory]
   ```


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