hey all, today i tried upgrading the spark version we use internally by creating a new internal release from the spark master branch. last time i did this was march 7.
with this updated spark i am seeing some serialization errors in the unit tests for our own libraries. looks like a scala reflection type that is not serializable is getting sucked into serialization for the encoder? see below. best, koert [info] org.apache.spark.SparkException: Task not serializable [info] at org.apache.spark.util.ClosureCleaner$.ensureSerializable(ClosureCleaner.scala:298) [info] at org.apache.spark.util.ClosureCleaner$.org$apache$spark$util$ClosureCleaner$$clean(ClosureCleaner.scala:288) [info] at org.apache.spark.util.ClosureCleaner$.clean(ClosureCleaner.scala:108) [info] at org.apache.spark.SparkContext.clean(SparkContext.scala:2284) [info] at org.apache.spark.SparkContext.runJob(SparkContext.scala:2058) ... [info] Serialization stack: [info] - object not serializable (class: scala.reflect.internal.BaseTypeSeqs$BaseTypeSeq, value: BTS(Int,AnyVal,Any)) [info] - field (class: scala.reflect.internal.Types$TypeRef, name: baseTypeSeqCache, type: class scala.reflect.internal.BaseTypeSeqs$BaseTypeSeq) [info] - object (class scala.reflect.internal.Types$ClassNoArgsTypeRef, Int) [info] - field (class: org.apache.spark.sql.catalyst.ScalaReflection$$anonfun$6, name: elementType$2, type: class scala.reflect.api.Types$TypeApi) [info] - object (class org.apache.spark.sql.catalyst.ScalaReflection$$anonfun$6, <function1>) [info] - field (class: org.apache.spark.sql.catalyst.expressions.objects.UnresolvedMapObjects, name: function, type: interface scala.Function1) [info] - object (class org.apache.spark.sql.catalyst.expressions.objects.UnresolvedMapObjects, unresolvedmapobjects(<function1>, getcolumnbyordinal(0, ArrayType(IntegerType,false)), Some(interface scala.collection.Seq))) [info] - field (class: org.apache.spark.sql.catalyst.expressions.objects.WrapOption, name: child, type: class org.apache.spark.sql.catalyst.expressions.Expression) [info] - object (class org.apache.spark.sql.catalyst.expressions.objects.WrapOption, wrapoption(unresolvedmapobjects(<function1>, getcolumnbyordinal(0, ArrayType(IntegerType,false)), Some(interface scala.collection.Seq)), ObjectType(interface scala.collection.Seq))) [info] - writeObject data (class: scala.collection.immutable.List$SerializationProxy) [info] - object (class scala.collection.immutable.List$SerializationProxy, scala.collection.immutable.List$SerializationProxy@69040c85) [info] - writeReplace data (class: scala.collection.immutable.List$SerializationProxy) [info] - object (class scala.collection.immutable.$colon$colon, List(wrapoption(unresolvedmapobjects(<function1>, getcolumnbyordinal(0, ArrayType(IntegerType,false)), Some(interface scala.collection.Seq)), ObjectType(interface scala.collection.Seq)))) [info] - field (class: org.apache.spark.sql.catalyst.expressions.objects.NewInstance, name: arguments, type: interface scala.collection.Seq) [info] - object (class org.apache.spark.sql.catalyst.expressions.objects.NewInstance, newInstance(class scala.Tuple1)) [info] - field (class: org.apache.spark.sql.catalyst.encoders.ExpressionEncoder, name: deserializer, type: class org.apache.spark.sql.catalyst.expressions.Expression) [info] - object (class org.apache.spark.sql.catalyst.encoders.ExpressionEncoder, class[_1[0]: array<int>]) ...
