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

    https://github.com/apache/spark/pull/18235#discussion_r123800801
  
    --- Diff: core/src/main/scala/org/apache/spark/deploy/SparkSubmit.scala ---
    @@ -310,33 +310,28 @@ object SparkSubmit extends CommandLineUtils {
           RPackageUtils.checkAndBuildRPackage(args.jars, printStream, 
args.verbose)
         }
     
    -    // In client mode, download remote files.
    -    if (deployMode == CLIENT) {
    -      val hadoopConf = new HadoopConfiguration()
    -      args.primaryResource = 
Option(args.primaryResource).map(downloadFile(_, hadoopConf)).orNull
    -      args.jars = Option(args.jars).map(downloadFileList(_, 
hadoopConf)).orNull
    -      args.pyFiles = Option(args.pyFiles).map(downloadFileList(_, 
hadoopConf)).orNull
    -      args.files = Option(args.files).map(downloadFileList(_, 
hadoopConf)).orNull
    -    }
    +    val hadoopConf = new HadoopConfiguration()
    +    val targetDir = Files.createTempDirectory("tmp").toFile
    --- End diff --
    
    I see this comes from the previous code, but who's deleting this directory?


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