Github user tgravescs commented on a diff in the pull request:
https://github.com/apache/spark/pull/9118#discussion_r42503542
--- Diff: yarn/src/main/scala/org/apache/spark/deploy/yarn/Client.scala ---
@@ -497,6 +497,19 @@ private[spark] class Client(
*/
private def createConfArchive(): File = {
val hadoopConfFiles = new HashMap[String, File]()
+
+ // Uploading $SPARK_CONF_DIR/log4j.properties file to the distributed
cache to make sure that
+ // the executors will use the latest configurations instead of the
default values. This is
+ // required when user changes log4j.properties directly to set the log
configurations. If
+ // configuration file is provided through --files then executors will
be taking configurations
+ // from --files instead of $SPARK_CONF_DIR/log4j.properties.
--- End diff --
Why does --files work? Is it just because it gets put on classpath first?
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