beliefer commented on code in PR #50107:
URL: https://github.com/apache/spark/pull/50107#discussion_r1973643904


##########
core/src/main/scala/org/apache/spark/BarrierTaskContext.scala:
##########
@@ -300,11 +300,7 @@ object BarrierTaskContext {
   @Since("2.4.0")
   def get(): BarrierTaskContext = 
TaskContext.get().asInstanceOf[BarrierTaskContext]
 
-  private val timer = {
-    val executor = ThreadUtils.newDaemonSingleThreadScheduledExecutor(
-      "Barrier task timer for barrier() calls.")
-    assert(executor.isInstanceOf[ScheduledThreadPoolExecutor])
-    executor.asInstanceOf[ScheduledThreadPoolExecutor]
-  }
+  private val timer = ThreadUtils.newSingleThreadScheduledExecutor(

Review Comment:
   The origin code is non-daemon thread here.
   Please see
   
https://github.com/apache/spark/commit/5d5b3a54b7b5fb4308fe40da696ba805c72983fc#diff-e9f66d336ded6632366be06dbd70e74afe9595cfc92a962f2c8554f09af53d0fL286



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