Github user jiangxb1987 commented on a diff in the pull request:

    https://github.com/apache/spark/pull/17357#discussion_r131544143
  
    --- Diff: 
core/src/main/scala/org/apache/spark/deploy/rest/StandaloneRestServer.scala ---
    @@ -139,7 +139,9 @@ private[rest] class StandaloneSubmitRequestServlet(
         val driverExtraLibraryPath = 
sparkProperties.get("spark.driver.extraLibraryPath")
         val superviseDriver = sparkProperties.get("spark.driver.supervise")
         val appArgs = request.appArgs
    -    val environmentVariables = request.environmentVariables
    +    // Filter SPARK_LOCAL environment variables from being set on the 
remote system.
    +    val environmentVariables =
    +      
request.environmentVariables.filterNot(_._1.startsWith("SPARK_LOCAL"))
    --- End diff --
    
    I think this should also affect `SPARK_LOCAL_DIRS`, is that expected?


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