srowen commented on a change in pull request #32877:
URL: https://github.com/apache/spark/pull/32877#discussion_r649945268



##########
File path: core/src/main/scala/org/apache/spark/ContextCleaner.scala
##########
@@ -188,7 +188,7 @@ private[spark] class ContextCleaner(
   private def keepCleaning(): Unit = Utils.tryOrStopSparkContext(sc) {
     while (!stopped) {
       try {
-        val reference = 
Option(referenceQueue.remove(ContextCleaner.REF_QUEUE_POLL_TIMEOUT))
+        val reference = Option(referenceQueue.remove())

Review comment:
       Hm, the issue is that remove() blocks indefinitely, so this would never 
let it check `stopped` again if nothing is in the queue?




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