Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/5696#discussion_r29095193
--- Diff:
yarn/src/main/scala/org/apache/spark/deploy/yarn/ApplicationMaster.scala ---
@@ -95,14 +95,8 @@ private[spark] class ApplicationMaster(
val fs = FileSystem.get(yarnConf)
- Utils.addShutdownHook { () =>
- // If the SparkContext is still registered, shut it down as a best
case effort in case
- // users do not call sc.stop or do System.exit().
- val sc = sparkContextRef.get()
- if (sc != null) {
- logInfo("Invoking sc stop from shutdown hook")
- sc.stop()
- }
+ // This shutdown hook should run *after* the SparkContext is shut
down.
+ Utils.addShutdownHook(Utils.SPARK_CONTEXT_SHUTDOWN_PRIORITY - 1) {
() =>
--- End diff --
> Calling stop() is idempotent right?
Correct.
> You have some spurious white-space changes in this PR.
IIRC that's in the style guide (not adding trailing whitespace) and we're
really, really bad at enforcing that.
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