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

    https://github.com/apache/spark/pull/20785#discussion_r174979402
  
    --- Diff: core/src/main/scala/org/apache/spark/util/Utils.scala ---
    @@ -2434,7 +2434,8 @@ private[spark] object Utils extends Logging {
        */
       def getSparkOrYarnConfig(conf: SparkConf, key: String, default: String): 
String = {
         val sparkValue = conf.get(key, default)
    -    if (conf.get(SparkLauncher.SPARK_MASTER, null) == "yarn") {
    +    if (conf.get(SparkLauncher.SPARK_MASTER, null) == "yarn"
    --- End diff --
    
    Assuming that `--conf spark.shuffle.service.port = 7338` is configured, 
7338 is displayed on the tab of the environment, but 7337 is actually used.
    So my idea is get value from `SparkConf ` if  key starting with `spark.` 
except for `spark.hadoop.`.
    



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