HyukjinKwon edited a comment on pull request #34276:
URL: https://github.com/apache/spark/pull/34276#issuecomment-963853824


   Hmm .. actually the UT is flaky:
   
   ```
   sbt.ForkMain$ForkError: org.scalatest.exceptions.TestFailedException: 
"Failed to list contents of Mock for File, hashCode: 1852043714" did not 
contain "Unknown I/O error"
        at 
org.scalatest.Assertions.newAssertionFailedException(Assertions.scala:472)
        at 
org.scalatest.Assertions.newAssertionFailedException$(Assertions.scala:471)
        at 
org.scalatest.Assertions$.newAssertionFailedException(Assertions.scala:1231)
        at 
org.scalatest.Assertions$AssertionsHelper.macroAssert(Assertions.scala:1295)
        at 
org.apache.spark.deploy.history.HistoryServerDiskManagerSuite.$anonfun$new$8(HistoryServerDiskManagerSuite.scala:178)
        at 
org.apache.spark.deploy.history.HistoryServerDiskManagerSuite.$anonfun$new$8$adapted(HistoryServerDiskManagerSuite.scala:167)
        at scala.collection.immutable.List.foreach(List.scala:333)
        at 
org.apache.spark.deploy.history.HistoryServerDiskManagerSuite.$anonfun$new$7(HistoryServerDiskManagerSuite.scala:167)
        at 
scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.scala:18)
        at org.scalatest.OutcomeOf.outcomeOf(OutcomeOf.scala:85)
        at org.scalatest.OutcomeOf.outcomeOf$(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.funsuite.AnyFunSuiteLike$$anon$1.apply(AnyFunSuiteLike.scala:226)
        at org.apache.spark.SparkFunSuite.withFixture(SparkFunSuite.scala:190)
        at 
org.scalatest.funsuite.AnyFunSuiteLike.invokeWithFixture$1(AnyFunSuiteLike.scala:224)
        at 
org.scalatest.funsuite.AnyFunSuiteLike.$anonfun$runTest$1(AnyFunSuiteLike.scala:236)
        at org.scalatest.SuperEngine.runTestImpl(Engine.scala:306)
        at 
org.scalatest.funsuite.AnyFunSuiteLike.runTest(AnyFunSuiteLike.scala:236)
        at 
org.scalatest.funsuite.AnyFunSuiteLike.runTest$(AnyFunSuiteLike.scala:218)
        at 
org.apache.spark.SparkFunSuite.org$scalatest$BeforeAndAfterEach$$super$runTest(SparkFunSuite.scala:62)
        at 
org.scalatest.BeforeAndAfterEach.runTest(BeforeAndAfterEach.scala:234)
        at 
org.scalatest.BeforeAndAfterEach.runTest$(BeforeAndAfterEach.scala:227)
        at 
org.apache.spark.deploy.history.HistoryServerDiskManagerSuite.org$scalatest$BeforeAndAfter$$super$runTest(HistoryServerDiskManagerSuite.scala:34)
        at org.scalatest.BeforeAndAfter.runTest(BeforeAndAfter.scala:213)
        at org.scalatest.BeforeAndAfter.runTest$(BeforeAndAfter.scala:203)
        at 
org.apache.spark.deploy.history.HistoryServerDiskManagerSuite.runTest(HistoryServerDiskManagerSuite.scala:34)
        at 
org.scalatest.funsuite.AnyFunSuiteLike.$anonfun$runTests$1(AnyFunSuiteLike.scala:269)
        at 
org.scalatest.SuperEngine.$anonfun$runTestsInBranch$1(Engine.scala:413)
   ```
   
   https://github.com/apache/spark/runs/4130442054
   https://github.com/apache/spark/runs/4134402381
   https://github.com/apache/spark/runs/4134402381
   
   
   I saw few more times during rerunning some tests too.


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