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

    https://github.com/apache/spark/pull/21734#discussion_r201271876
  
    --- Diff: 
resource-managers/yarn/src/main/scala/org/apache/spark/deploy/yarn/YarnSparkHadoopUtil.scala
 ---
    @@ -193,8 +193,7 @@ object YarnSparkHadoopUtil {
           sparkConf: SparkConf,
           hadoopConf: Configuration): Set[FileSystem] = {
         val filesystemsToAccess = sparkConf.get(FILESYSTEMS_TO_ACCESS)
    -      .map(new Path(_).getFileSystem(hadoopConf))
    -      .toSet
    +    val isRequestAllDelegationTokens = filesystemsToAccess.isEmpty
    --- End diff --
    
    Now the `spark.yarn.access.hadoopFileSystems` configuration is invalid, 
always get all tokens.


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