Github user zsxwing commented on a diff in the pull request:
https://github.com/apache/spark/pull/22816#discussion_r228262084
--- Diff:
core/src/main/scala/org/apache/spark/api/python/PythonRunner.scala ---
@@ -114,7 +114,7 @@ private[spark] abstract class BasePythonRunner[IN, OUT](
context.addTaskCompletionListener[Unit] { _ =>
writerThread.shutdownOnTaskCompletion()
- if (!reuseWorker || !released.get) {
+ if (!reuseWorker || released.compareAndSet(false, true)) {
--- End diff --
Addressed
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