[GitHub] spark issue #18594: [SPARK-20904][core] Don't report task failures to driver...

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

Github user vanzin commented on the issue:

    https://github.com/apache/spark/pull/18594
  
    Here's the hacky test code for the interested:
    
    ```
    sc.parallelize(1 to 100, 100).foreach { _ =>
      var shuttingDown = false
      
      while (!shuttingDown) {
        try {
          val hook = new Thread {
            override def run() {}
          }
          // scalastyle:off runtimeaddshutdownhook
          Runtime.getRuntime.addShutdownHook(hook)
          // scalastyle:on runtimeaddshutdownhook
          Runtime.getRuntime.removeShutdownHook(hook)
          
          Thread.sleep(10)
        } catch {
          case ise: IllegalStateException => shuttingDown = true
        }
      }
    
      throw new Exception("Task failure during shutdown.")
    }
    ```
    
    Ran that in two shells, one in a low priority queue and one in a high priority one, restarting the high priority one to force several rounds of executors being killed by preemption in the low priority queue.


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