Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/3233#discussion_r24357111
--- 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 --
> because these jars are technically added to the JVM's class path
Not true. They're added to a different class loader, and thus do not show
up in `sys.props("java.class.path")` at all.
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