Github user zsxwing commented on a diff in the pull request:
https://github.com/apache/spark/pull/16872#discussion_r100386073
--- Diff:
sql/core/src/test/scala/org/apache/spark/sql/DataFrameRangeSuite.scala ---
@@ -127,4 +133,28 @@ class DataFrameRangeSuite extends QueryTest with
SharedSQLContext {
}
}
}
+
+ test("Cancelling stage in a query with Range.") {
+ val listener = new SparkListener {
+ override def onTaskStart(taskStart: SparkListenerTaskStart): Unit = {
+ Thread.sleep(100)
--- End diff --
What's the purpose of this listener? Blocking `onTaskStart` only slows down
the listener bus thread. It should not block other events from being emitted
(It may drop events if the queue is full though). If it does happen, then it's
a bug.
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