Github user andrewor14 commented on a diff in the pull request:
https://github.com/apache/spark/pull/6083#discussion_r30286641
--- Diff: core/src/main/scala/org/apache/spark/SparkContext.scala ---
@@ -371,6 +371,14 @@ class SparkContext(config: SparkConf) extends Logging
with ExecutorAllocationCli
throw new SparkException("An application name must be set in your
configuration")
}
+ // System property spark.yarn.app.id must be set if user code ran by
AM on a YARN cluster
+ // yarn-standalone is deprecated, but still supported
+ if ((master == "yarn-cluster" || master == "yarn-standalone") &&
+ !_conf.contains("spark.yarn.app.id")) {
--- End diff --
@ehnalis the reason I don't think it's necessary is because the user can't
get a `spark.yarn.app.id` without using cluster mode. I think it's slightly
better to leave it out so we keep the code as simple as possible.
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