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

    https://github.com/apache/spark/pull/18322#discussion_r122610588
  
    --- Diff: 
core/src/main/scala/org/apache/spark/deploy/SparkSubmitArguments.scala ---
    @@ -278,6 +278,14 @@ private[deploy] class SparkSubmitArguments(args: 
Seq[String], env: Map[String, S
         if (pyFiles != null && !isPython) {
           SparkSubmit.printErrorAndExit("--py-files given but primary resource 
is not a Python script")
         }
    +    if (totalExecutorCores != null && executorCores != null) {
    --- End diff --
    
    Think about this again, I think this part of code logic could be moved to 
`SparkConf`, in case user sets these configuration via `SparkConf` object in a 
programmatic way.


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