Shixiong Zhu created SPARK-25899:
------------------------------------

             Summary: Flaky test: CoarseGrainedSchedulerBackendSuite.compute 
max number of concurrent tasks can be launched
                 Key: SPARK-25899
                 URL: https://issues.apache.org/jira/browse/SPARK-25899
             Project: Spark
          Issue Type: Documentation
          Components: Tests
    Affects Versions: 2.4.0
            Reporter: Shixiong Zhu
            Assignee: Shixiong Zhu


{code}
sbt.ForkMain$ForkError: 
org.scalatest.exceptions.TestFailedDueToTimeoutException: The code passed to 
eventually never returned normally. Attempted 400 times over 10.009828643999999 
seconds. Last failure message: ArrayBuffer("2", "0", "3") had length 3 instead 
of expected length 4.
        at 
org.scalatest.concurrent.Eventually$class.tryTryAgain$1(Eventually.scala:421)
        at 
org.scalatest.concurrent.Eventually$class.eventually(Eventually.scala:439)
        at 
org.apache.spark.scheduler.CoarseGrainedSchedulerBackendSuite.eventually(CoarseGrainedSchedulerBackendSuite.scala:30)
        at 
org.scalatest.concurrent.Eventually$class.eventually(Eventually.scala:337)
        at 
org.apache.spark.scheduler.CoarseGrainedSchedulerBackendSuite.eventually(CoarseGrainedSchedulerBackendSuite.scala:30)
        at 
org.apache.spark.scheduler.CoarseGrainedSchedulerBackendSuite$$anonfun$3.apply(CoarseGrainedSchedulerBackendSuite.scala:54)
        at 
org.apache.spark.scheduler.CoarseGrainedSchedulerBackendSuite$$anonfun$3.apply(CoarseGrainedSchedulerBackendSuite.scala:49)
        at 
org.apache.spark.SparkFunSuite$$anonfun$test$1.apply(SparkFunSuite.scala:266)
        at org.scalatest.OutcomeOf$class.outcomeOf(OutcomeOf.scala:85)
        at org.scalatest.OutcomeOf$.outcomeOf(OutcomeOf.scala:104)
        at org.scalatest.Transformer.apply(Transformer.scala:22)
        at org.scalatest.Transformer.apply(Transformer.scala:20)
        at org.scalatest.FunSuiteLike$$anon$1.apply(FunSuiteLike.scala:186)
        at org.apache.spark.SparkFunSuite.withFixture(SparkFunSuite.scala:168)
        at 
org.scalatest.FunSuiteLike$class.invokeWithFixture$1(FunSuiteLike.scala:183)
        at 
org.scalatest.FunSuiteLike$$anonfun$runTest$1.apply(FunSuiteLike.scala:196)
        at 
org.scalatest.FunSuiteLike$$anonfun$runTest$1.apply(FunSuiteLike.scala:196)
        at org.scalatest.SuperEngine.runTestImpl(Engine.scala:289)
        at org.scalatest.FunSuiteLike$class.runTest(FunSuiteLike.scala:196)
        at 
org.apache.spark.SparkFunSuite.org$scalatest$BeforeAndAfterEach$$super$runTest(SparkFunSuite.scala:62)
        at 
org.scalatest.BeforeAndAfterEach$class.runTest(BeforeAndAfterEach.scala:221)
        at org.apache.spark.SparkFunSuite.runTest(SparkFunSuite.scala:62)
        at 
org.scalatest.FunSuiteLike$$anonfun$runTests$1.apply(FunSuiteLike.scala:229)
        at 
org.scalatest.FunSuiteLike$$anonfun$runTests$1.apply(FunSuiteLike.scala:229)
        at 
org.scalatest.SuperEngine$$anonfun$traverseSubNodes$1$1.apply(Engine.scala:396)
        at 
org.scalatest.SuperEngine$$anonfun$traverseSubNodes$1$1.apply(Engine.scala:384)
        at scala.collection.immutable.List.foreach(List.scala:392)
        at org.scalatest.SuperEngine.traverseSubNodes$1(Engine.scala:384)
        at 
org.scalatest.SuperEngine.org$scalatest$SuperEngine$$runTestsInBranch(Engine.scala:379)
        at org.scalatest.SuperEngine.runTestsImpl(Engine.scala:461)
        at org.scalatest.FunSuiteLike$class.runTests(FunSuiteLike.scala:229)
        at org.scalatest.FunSuite.runTests(FunSuite.scala:1560)
        at org.scalatest.Suite$class.run(Suite.scala:1147)
        at 
org.scalatest.FunSuite.org$scalatest$FunSuiteLike$$super$run(FunSuite.scala:1560)
        at 
org.scalatest.FunSuiteLike$$anonfun$run$1.apply(FunSuiteLike.scala:233)
        at 
org.scalatest.FunSuiteLike$$anonfun$run$1.apply(FunSuiteLike.scala:233)
        at org.scalatest.SuperEngine.runImpl(Engine.scala:521)
        at org.scalatest.FunSuiteLike$class.run(FunSuiteLike.scala:233)
        at 
org.apache.spark.SparkFunSuite.org$scalatest$BeforeAndAfterAll$$super$run(SparkFunSuite.scala:62)
        at 
org.scalatest.BeforeAndAfterAll$class.liftedTree1$1(BeforeAndAfterAll.scala:213)
        at 
org.scalatest.BeforeAndAfterAll$class.run(BeforeAndAfterAll.scala:210)
        at org.apache.spark.SparkFunSuite.run(SparkFunSuite.scala:62)
        at 
org.scalatest.tools.Framework.org$scalatest$tools$Framework$$runSuite(Framework.scala:314)
        at 
org.scalatest.tools.Framework$ScalaTestTask.execute(Framework.scala:480)
        at sbt.ForkMain$Run$2.call(ForkMain.java:296)
        at sbt.ForkMain$Run$2.call(ForkMain.java:286)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:748)
Caused by: sbt.ForkMain$ForkError: 
org.scalatest.exceptions.TestFailedException: ArrayBuffer("2", "0", "3") had 
length 3 instead of expected length 4
        at 
org.scalatest.Assertions$class.newAssertionFailedException(Assertions.scala:528)
        at 
org.scalatest.FunSuite.newAssertionFailedException(FunSuite.scala:1560)
        at 
org.scalatest.Assertions$AssertionsHelper.macroAssert(Assertions.scala:501)
        at 
org.apache.spark.scheduler.CoarseGrainedSchedulerBackendSuite$$anonfun$3$$anonfun$apply$1.apply(CoarseGrainedSchedulerBackendSuite.scala:56)
        at 
org.apache.spark.scheduler.CoarseGrainedSchedulerBackendSuite$$anonfun$3$$anonfun$apply$1.apply(CoarseGrainedSchedulerBackendSuite.scala:56)
        at 
org.scalatest.concurrent.Eventually$class.makeAValiantAttempt$1(Eventually.scala:395)
        at 
org.scalatest.concurrent.Eventually$class.tryTryAgain$1(Eventually.scala:409)
        ... 49 more
{code}



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