[GitHub] spark pull request: [YARN][SPARK-3293]Fix yarn's web show "SUCCEED...

[tgravescs <gi...@git.apache.org>]

Github user tgravescs commented on a diff in the pull request:

    https://github.com/apache/spark/pull/3508#discussion_r21090918
  
    --- Diff: core/src/main/scala/org/apache/spark/scheduler/cluster/YarnSchedulerBackend.scala ---
    @@ -92,6 +104,57 @@ private[spark] abstract class YarnSchedulerBackend(
       }
     
       /**
    +   * This system security manager applies to the entire process.
    +   * It's main purpose is to handle the case if the user code does a System.exit.
    +   * This allows us to catch that and properly set the YARN application status and
    +   * cleanup if needed.
    +   */
    +  private def setupSystemSecurityManager(amActor: ActorRef): Unit = {
    --- End diff --
    
    The securityManager in the AM was causing a performance impact and we just removed it.  I expect the same issue to happen here. https://github.com/apache/spark/pull/3484


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