Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/18393#discussion_r125884967
--- 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 --
is it better to use fewer partitions? which can make it easier to reproduce
the bug.
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