Flaky test:DAGSchedulerSuite.Barrier task failures from the same stage attempt don't trigger multiple stage retries

org.apache.spark.scheduler.DAGSchedulerSuite.Barrier task failures from the same stage attempt don't trigger multiple stage retries

Error Message
org.scalatest.exceptions.TestFailedException: ArrayBuffer() did not equal List(0)

Stacktrace
sbt.ForkMain$ForkError: org.scalatest.exceptions.TestFailedException: ArrayBuffer() did not equal List(0)
	at org.scalatest.Assertions.newAssertionFailedException(Assertions.scala:528)
	at org.scalatest.Assertions.newAssertionFailedException$(Assertions.scala:527)
	at org.scalatest.FunSuite.newAssertionFailedException(FunSuite.scala:1560)
	at org.scalatest.Assertions$AssertionsHelper.macroAssert(Assertions.scala:501)
	at org.apache.spark.scheduler.DAGSchedulerSuite.$anonfun$new$144(DAGSchedulerSuite.scala:2644)
	at org.scalatest.OutcomeOf.outcomeOf(OutcomeOf.scala:85)
	at org.scalatest.OutcomeOf.outcomeOf$(OutcomeOf.scala:83)
	at org.scalatest.OutcomeOf$.outcomeOf(OutcomeOf.scala:104)
	at org.scalatest.Transformer.apply(Transformer.scala:22)
	at org.scalatest.Transformer.apply(Transformer.scala:20)
	at org.scalatest.FunSuiteLike$$anon$1.apply(FunSuiteLike.scala:186)
	at org.apache.spark.SparkFunSuite.withFixture(SparkFunSuite.scala:104)
	at org.scalatest.FunSuiteLike.invokeWithFixture$1(FunSuiteLike.scala:184)
	at org.scalatest.FunSuiteLike.$anonfun$runTest$1(FunSuiteLike.scala:196)
	at org.scalatest.SuperEngine.runTestImpl(Engine.scala:289)
	at org.scalatest.FunSuiteLike.runTest(FunSuiteLike.scala:196)
	at org.scalatest.FunSuiteLike.runTest$(FunSuiteLike.scala:178)
	at org.apache.spark.scheduler.DAGSchedulerSuite.org$scalatest$BeforeAndAfterEach$$super$runTest(DAGSchedulerSuite.scala:122)