Github user gaborgsomogyi commented on a diff in the pull request:
https://github.com/apache/spark/pull/20807#discussion_r174983468
--- Diff: resource-managers/yarn/src/main/scala/org/apache/spark/deploy/yarn/ApplicationMaster.scala
---
@@ -497,6 +500,8 @@ private[spark] class ApplicationMaster(args: ApplicationMasterArguments)
extends
// if the user app did not create a SparkContext.
throw new IllegalStateException("User did not initialize spark context!")
}
+ // After initialisation notify user class thread to continue
+ synchronized { notify() }
--- End diff --
Moved into `resumeDriver` function right below `sparkContextInitialized`.
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