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

    https://github.com/apache/spark/pull/4747#discussion_r25289755
  
    --- Diff: 
core/src/main/scala/org/apache/spark/deploy/worker/ExecutorRunner.scala ---
    @@ -135,7 +135,7 @@ private[spark] class ExecutorRunner(
           logInfo("Launch command: " + command.mkString("\"", "\" \"", "\""))
     
           builder.directory(executorDir)
    -      builder.environment.put("SPARK_LOCAL_DIRS", 
appLocalDirs.mkString(","))
    +      builder.environment.put("SPARK_EXECUTOR_DIRS", 
appLocalDirs.mkString(File.pathSeparator))
    --- End diff --
    
    Oh right, this is `path.separator` not `file.separator`, `:` not `/`. 
    
    Yes that's exactly the fix that needs to be made.
    
    `SPARK_EXECUTOR_DIRS` is a new system property right? where is it read? I 
am missing something.


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