Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/20807#discussion_r174965130
--- 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 --
Since you have to do this in two places, I'd create a method (e.g.
`resumeDriver`) close to where `sparkContextInitialized` is declared, so that
it's easier to find the context of why this is needed.
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