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

    https://github.com/apache/spark/pull/11746#discussion_r73768879
  
    --- Diff: 
core/src/main/scala/org/apache/spark/deploy/worker/DriverRunner.scala ---
    @@ -78,49 +80,53 @@ private[deploy] class DriverRunner(
       private[worker] def start() = {
         new Thread("DriverRunner for " + driverId) {
           override def run() {
    +        var shutdownHook: AnyRef = null
             try {
    -          val driverDir = createWorkingDirectory()
    -          val localJarFilename = downloadUserJar(driverDir)
    -
    -          def substituteVariables(argument: String): String = argument 
match {
    -            case "{{WORKER_URL}}" => workerUrl
    -            case "{{USER_JAR}}" => localJarFilename
    -            case other => other
    +          shutdownHook = ShutdownHookManager.addShutdownHook { () =>
    +            logInfo(s"Worker shutting down, killing driver $driverId")
    +            kill()
               }
     
    -          // TODO: If we add ability to submit multiple jars they should 
also be added here
    -          val builder = 
CommandUtils.buildProcessBuilder(driverDesc.command, securityManager,
    -            driverDesc.mem, sparkHome.getAbsolutePath, substituteVariables)
    -          launchDriver(builder, driverDir, driverDesc.supervise)
    -        }
    -        catch {
    -          case e: Exception => finalException = Some(e)
    -        }
    +          // prepare driver jars and launch driver
    +          val exitCode = prepareAndLaunchDriver()
     
    -        val state =
    -          if (killed) {
    -            DriverState.KILLED
    -          } else if (finalException.isDefined) {
    -            DriverState.ERROR
    +          // set final state depending on if forcibly killed and process 
exit code
    +          finalState = if (exitCode == 0) {
    +            Some(DriverState.FINISHED)
    +          } else if (killed) {
    +            Some(DriverState.KILLED)
               } else {
    -            finalExitCode match {
    -              case Some(0) => DriverState.FINISHED
    -              case _ => DriverState.FAILED
    -            }
    +            Some(DriverState.FAILED)
               }
    +        }
    +        catch {
    +          case e: Exception =>
    +            kill()
    +            finalState = Some(DriverState.ERROR)
    +            finalException = Some(e)
    +        }
    +        finally {
    +          if (shutdownHook != null) 
ShutdownHookManager.removeShutdownHook(shutdownHook)
    --- End diff --
    
    nit: use long form
    
    ```
    if (foo) {
      do something
    }
    ```


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