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

    https://github.com/apache/spark/pull/19934#discussion_r155922544
  
    --- Diff: core/src/main/scala/org/apache/spark/util/Utils.scala ---
    @@ -829,7 +829,18 @@ private[spark] object Utils extends Logging {
       }
     
       private def getOrCreateLocalRootDirsImpl(conf: SparkConf): Array[String] 
= {
    --- End diff --
    
    Note that, this seems only being called via 
`Utils.getOrCreateLocalRootDirs` which caches `localRootDirs`. So, I think this 
won't mess up logs.


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