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

    https://github.com/apache/spark/pull/23055#discussion_r234691652
  
    --- 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 --
    
    @HyukjinKwon, what should the JVM side do differently if `resource` is not 
available?
    
    I don't think it should do anything different. It should still allocate the 
python memory region when requesting resources from schedulers. The only 
difference is that python isn't self-limiting. Do you have an example of 
something that the JVM should change when running on Windows?


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