Github user Sephiroth-Lin commented on a diff in the pull request:

    https://github.com/apache/spark/pull/5479#discussion_r28210698
  
    --- Diff: 
yarn/src/main/scala/org/apache/spark/scheduler/cluster/YarnClientSchedulerBackend.scala
 ---
    @@ -128,10 +128,14 @@ private[spark] class YarnClientSchedulerBackend(
         assert(client != null && appId != null, "Application has not been 
submitted yet!")
         val t = new Thread {
           override def run() {
    -        val (state, _) = client.monitorApplication(appId, 
logApplicationReport = false)
    -        logError(s"Yarn application has already exited with state $state!")
    -        sc.stop()
    -        Thread.currentThread().interrupt()
    +        try {
    +          val (state, _) = client.monitorApplication(appId, 
logApplicationReport = false)
    --- End diff --
    
    Yes, we don't need to call Thread.currentThread().interrupt() here, but I 
think we need to stop the SparkContext. If user kill the app on Yarn, then we 
need to stop the SparkContext right?


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