Github user tgravescs commented on a diff in the pull request:
https://github.com/apache/spark/pull/15009#discussion_r81984232
--- Diff: yarn/src/main/scala/org/apache/spark/deploy/yarn/Client.scala ---
@@ -1197,12 +1229,22 @@ private object Client extends Logging {
// Set an env variable indicating we are running in YARN mode.
// Note that any env variable with the SPARK_ prefix gets propagated
to all (remote) processes
System.setProperty("SPARK_YARN_MODE", "true")
+
+ val threadEnabled: Boolean =
env.get("spark.launcher.internal.thread.enabled").
+ getOrElse("false").toBoolean
+
val sparkConf = new SparkConf
+ if( threadEnabled) {
--- End diff --
space spacing if (threadEnabled)
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