Github user cloud-fan commented on a diff in the pull request:

    https://github.com/apache/spark/pull/20516#discussion_r167133408
  
    --- Diff: core/src/main/scala/org/apache/spark/util/Utils.scala ---
    @@ -2222,7 +2222,7 @@ private[spark] object Utils extends Logging {
        */
       def portMaxRetries(conf: SparkConf): Int = {
         val maxRetries = conf.getOption("spark.port.maxRetries").map(_.toInt)
    -    if (conf.contains("spark.testing")) {
    +    if (isTesting || conf.contains("spark.testing")) {
    --- End diff --
    
    shall we just call `isTesting` here?


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