Not excluding this means that our log4j.properties gets ignored as SLF4J uses slf4j-simple as the logging backend. To test this you can run sbt/sbt test without this change and you should see lines like
[Executor task launch worker-0] INFO org.apache.spark.storage.BlockManager - Found block rdd_150_1 locally
Not excluding this means that our
log4j.properties
gets ignored as SLF4J usesslf4j-simple
as the logging backend. To test this you can runsbt/sbt test
without this change and you should see lines likewhich will no longer appear with this change