Github user squito commented on the pull request:
https://github.com/apache/spark/pull/11487#issuecomment-206519307
@ueshin Have you found this test to pass consistently on 2.10? It seems we
don't actually run these tests on 2.10 at all anymore, but when I run locally,
say with
```
build/sbt -Pyarn -Phadoop-2.4 -Dhadoop.version=2.6.0 -Dscala-2.10
-Pscala-2.10
test-only *.ScalaReflectionSuite
```
it sometimes works, but sometimes fails with a variety of failures like:
```
[info] - SPARK-13640: thread safety of dataTypeFor *** FAILED *** (1
second, 546 milliseconds)
[info] scala.collection.parallel.CompositeThrowable: Multiple exceptions
thrown during a parallel computation: java.lang.UnsupportedOperationException:
tail of empty list
[info] scala.collection.immutable.Nil$.tail(List.scala:339)
[info] scala.collection.immutable.Nil$.tail(List.scala:334)
[info] scala.reflect.internal.SymbolTable.popPhase(SymbolTable.scala:172)
[info]
scala.reflect.internal.Symbols$Symbol.unsafeTypeParams(Symbols.scala:1477)
[info] scala.reflect.internal.Symbols$TypeSymbol.tpe(Symbols.scala:2777)
[info]
scala.reflect.internal.Mirrors$Roots$RootPackage$.<init>(Mirrors.scala:268)
[info]
scala.reflect.internal.Mirrors$Roots.RootPackage$lzycompute(Mirrors.scala:267)
[info] scala.reflect.internal.Mirrors$Roots.RootPackage(Mirrors.scala:267)
[info] scala.reflect.internal.Mirrors$Roots.RootPackage(Mirrors.scala:245)
[info] scala.reflect.internal.Mirrors$RootsBase.init(Mirrors.scala:238)
...
```
or
```
[info] - SPARK-13640: thread safety of constructorFor *** FAILED *** (8
seconds, 59 milliseconds)
[info] scala.reflect.internal.Symbols$CyclicReference: illegal cyclic
reference involving package catalyst
[info] at
scala.reflect.internal.Symbols$TypeSymbol.tpe(Symbols.scala:2768)
[info] at
scala.reflect.internal.transform.Erasure$class.rebindInnerClass(Erasure.scala:72)
[info] at
scala.reflect.internal.transform.Transforms$$anonfun$3$$anon$1.rebindInnerClass(Transforms.scala:27)
[info] at
scala.reflect.internal.transform.Erasure$ErasureMap.eraseNormalClassRef(Erasure.scala:114)
[info] at
scala.reflect.internal.transform.Erasure$ErasureMap.apply(Erasure.scala:132)
[info] at
scala.reflect.internal.transform.Transforms$class.transformedType(Transforms.scala:39)
[info] at
scala.reflect.internal.SymbolTable.transformedType(SymbolTable.scala:13)
[info] at
scala.reflect.internal.Types$TypeApiImpl.erasure(Types.scala:306)
[info] at
scala.reflect.internal.Types$TypeApiImpl.erasure(Types.scala:298)
[info] at
org.apache.spark.sql.catalyst.ScalaReflection$class.getClassNameFromType(ScalaReflection.scala:775)
...
```
It seems like a pretty rare race -- any attempt I make to add any logging,
or even a try/catch, makes it seem to disappear (at least, less than 1 in 10
runs after any changes). Maybe this is just the same as SPARK-10719, and there
isn't anything better we can do here?
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