Github user andrewor14 commented on a diff in the pull request:
https://github.com/apache/spark/pull/3233#discussion_r24306886
--- Diff: yarn/src/main/scala/org/apache/spark/deploy/yarn/Client.scala ---
@@ -782,7 +785,13 @@ object Client extends Logging {
/**
* Populate the classpath entry in the given environment map.
- * This includes the user jar, Spark jar, and any extra application jars.
+ *
+ * User jars are generally not added to the JVM's classpath; those are
handled by the AM and
+ * executor backend. When the deprecated
`spark.yarn.user.classpath.first` is used, user jars are
--- End diff --
It would be clearer if you explicitly say that `those are loaded by the AM
or the executor backend dynamically`, because it's technically added to the
JVM's class path, just that it's added later.
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