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https://issues.apache.org/jira/browse/SPARK-14540?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15649090#comment-15649090
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Taro L. Saito commented on SPARK-14540:
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I'm also hitting a similar problem in my dependency injection library for
Scala: https://github.com/wvlet/airframe/pull/39.
I feel ClosureCleaner like functionality is necessary in Scala 2.12 itself.
> Support Scala 2.12 closures and Java 8 lambdas in ClosureCleaner
> ----------------------------------------------------------------
>
> Key: SPARK-14540
> URL: https://issues.apache.org/jira/browse/SPARK-14540
> Project: Spark
> Issue Type: Sub-task
> Components: Spark Core
> Reporter: Josh Rosen
>
> Using https://github.com/JoshRosen/spark/tree/build-for-2.12, I tried running
> ClosureCleanerSuite with Scala 2.12 and ran into two bad test failures:
> {code}
> [info] - toplevel return statements in closures are identified at cleaning
> time *** FAILED *** (32 milliseconds)
> [info] Expected exception
> org.apache.spark.util.ReturnStatementInClosureException to be thrown, but no
> exception was thrown. (ClosureCleanerSuite.scala:57)
> {code}
> and
> {code}
> [info] - user provided closures are actually cleaned *** FAILED *** (56
> milliseconds)
> [info] Expected ReturnStatementInClosureException, but got
> org.apache.spark.SparkException: Job aborted due to stage failure: Task not
> serializable: java.io.NotSerializableException: java.lang.Object
> [info] - element of array (index: 0)
> [info] - array (class "[Ljava.lang.Object;", size: 1)
> [info] - field (class "java.lang.invoke.SerializedLambda", name:
> "capturedArgs", type: "class [Ljava.lang.Object;")
> [info] - object (class "java.lang.invoke.SerializedLambda",
> SerializedLambda[capturingClass=class
> org.apache.spark.util.TestUserClosuresActuallyCleaned$,
> functionalInterfaceMethod=scala/runtime/java8/JFunction1$mcII$sp.apply$mcII$sp:(I)I,
> implementation=invokeStatic
> org/apache/spark/util/TestUserClosuresActuallyCleaned$.org$apache$spark$util$TestUserClosuresActuallyCleaned$$$anonfun$69:(Ljava/lang/Object;I)I,
> instantiatedMethodType=(I)I, numCaptured=1])
> [info] - element of array (index: 0)
> [info] - array (class "[Ljava.lang.Object;", size: 1)
> [info] - field (class "java.lang.invoke.SerializedLambda", name:
> "capturedArgs", type: "class [Ljava.lang.Object;")
> [info] - object (class "java.lang.invoke.SerializedLambda",
> SerializedLambda[capturingClass=class org.apache.spark.rdd.RDD,
> functionalInterfaceMethod=scala/Function3.apply:(Ljava/lang/Object;Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;,
> implementation=invokeStatic
> org/apache/spark/rdd/RDD.org$apache$spark$rdd$RDD$$$anonfun$20$adapted:(Lscala/Function1;Lorg/apache/spark/TaskContext;Ljava/lang/Object;Lscala/collection/Iterator;)Lscala/collection/Iterator;,
>
> instantiatedMethodType=(Lorg/apache/spark/TaskContext;Ljava/lang/Object;Lscala/collection/Iterator;)Lscala/collection/Iterator;,
> numCaptured=1])
> [info] - field (class "org.apache.spark.rdd.MapPartitionsRDD", name:
> "f", type: "interface scala.Function3")
> [info] - object (class "org.apache.spark.rdd.MapPartitionsRDD",
> MapPartitionsRDD[2] at apply at Transformer.scala:22)
> [info] - field (class "scala.Tuple2", name: "_1", type: "class
> java.lang.Object")
> [info] - root object (class "scala.Tuple2", (MapPartitionsRDD[2] at
> apply at
> Transformer.scala:22,org.apache.spark.SparkContext$$Lambda$957/431842435@6e803685)).
> [info] This means the closure provided by user is not actually cleaned.
> (ClosureCleanerSuite.scala:78)
> {code}
> We'll need to figure out a closure cleaning strategy which works for 2.12
> lambdas.
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