Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/8649#discussion_r38982863
--- Diff: yarn/src/main/scala/org/apache/spark/deploy/yarn/Client.scala ---
@@ -1045,7 +1045,8 @@ object Client extends Logging {
s"in favor of the $CONF_SPARK_JAR configuration variable.")
System.getenv(ENV_SPARK_JAR)
} else {
- SparkContext.jarOfClass(this.getClass).head
+ SparkContext.jarOfClass(this.getClass).getOrElse(throw new
SparkException("Could not " +
+ "find jar with spark-yarn related code, make sure
SPARK_PREPEND_CLASSES is not set"))
--- End diff --
If you want to be more helpful, you can also mention that the user can set
`spark.yarn.jar` to force Spark to use a specific Spark archive instead of
trying to figure it out from the classpath.
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