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

    https://github.com/apache/spark/pull/23055#discussion_r234081475
  
    --- Diff: 
core/src/main/scala/org/apache/spark/api/python/PythonRunner.scala ---
    @@ -74,8 +74,13 @@ private[spark] abstract class BasePythonRunner[IN, OUT](
       private val reuseWorker = conf.getBoolean("spark.python.worker.reuse", 
true)
       // each python worker gets an equal part of the allocation. the worker 
pool will grow to the
       // number of concurrent tasks, which is determined by the number of 
cores in this executor.
    -  private val memoryMb = conf.get(PYSPARK_EXECUTOR_MEMORY)
    +  private val memoryMb = if (Utils.isWindows) {
    --- End diff --
    
    I see. I think the point of view is a bit different. What I was trying to 
do is that:
    we declare this configuration is not supported on Windows, meaning we 
disable this configuration on Windows from the start, JVM side - because it's 
JVM to launch Python workers. So, I was trying to leave the control to JVM.
    
    > It seems brittle to disable this on the JVM side and rely on it here. Can 
we also set a flag in the ImportError case and also check that here?
    
    However, in a way, It's a bit odd to say it's brittle because we're already 
relying on that.


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