Github user vanzin commented on a diff in the pull request: https://github.com/apache/spark/pull/18393#discussion_r126273879 --- Diff: core/src/test/scala/org/apache/spark/scheduler/DAGSchedulerSuite.scala --- @@ -2277,6 +2277,29 @@ class DAGSchedulerSuite extends SparkFunSuite with LocalSparkContext with Timeou (Success, 1))) } + test("task end event should have updated accumulators (SPARK-20342)") { + val accumIds = new HashSet[Long]() + val listener = new SparkListener() { + override def onTaskEnd(event: SparkListenerTaskEnd): Unit = { + event.taskInfo.accumulables.foreach { acc => accumIds += acc.id } + } + } + sc.addSparkListener(listener) + + // Try a few times in a loop to make sure. This is not guaranteed to fail when the bug exists, + // but it should at least make the test flaky. If the bug is fixed, this should always pass. + (1 to 10).foreach { _ => + accumIds.clear() + + val accum = sc.longAccumulator + sc.parallelize(1 to 10, 10).foreach { _ => --- End diff -- ah, I see. I'll tweak the test in a different way.
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