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https://issues.apache.org/jira/browse/SPARK-20525?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen updated SPARK-20525:
------------------------------
Priority: Major (was: Critical)
[~dknoester]: let committers decide priority. I see no evidence that this isn't
just a Scala version mismatch. Why did you reopen it?
> ClassCast exception when interpreting UDFs from a String in spark-shell
> -----------------------------------------------------------------------
>
> Key: SPARK-20525
> URL: https://issues.apache.org/jira/browse/SPARK-20525
> Project: Spark
> Issue Type: Bug
> Components: Spark Core, Spark Shell
> Affects Versions: 2.1.0
> Environment: OS X 10.11.6, spark-2.1.0-bin-hadoop2.7, Scala version
> 2.11.8 (bundled w/ Spark), Java 1.8.0_121
> Reporter: Dave Knoester
> Attachments: UdfTest.scala
>
>
> I'm trying to interpret a string containing Scala code from inside a Spark
> session. Everything is working fine, except for User Defined Function-like
> things (UDFs, map, flatMap, etc). This is a blocker for production launch of
> a large number of Spark jobs.
> I've been able to boil the problem down to a number of spark-shell examples,
> shown below. Because it's reproducible in the spark-shell, these related
> issues **don't apply**:
> https://issues.apache.org/jira/browse/SPARK-9219
> https://issues.apache.org/jira/browse/SPARK-18075
> https://issues.apache.org/jira/browse/SPARK-19938
> http://apache-spark-developers-list.1001551.n3.nabble.com/This-Exception-has-been-really-hard-to-trace-td19362.html
> https://community.mapr.com/thread/21488-spark-error-scalacollectionseq-in-instance-of-orgapachesparkrddmappartitionsrdd
> https://github.com/scala/bug/issues/9237
> Any help is appreciated!
> ========
> Repro:
> Run each of the below from a spark-shell.
> Preamble:
> import scala.tools.nsc.GenericRunnerSettings
> import scala.tools.nsc.interpreter.IMain
> val settings = new GenericRunnerSettings( println _ )
> settings.usejavacp.value = true
> val interpreter = new IMain(settings, new java.io.PrintWriter(System.out))
> interpreter.bind("spark", spark);
> These work:
> // works:
> interpreter.interpret("val x = 5")
> // works:
> interpreter.interpret("import spark.implicits._\nval df =
> spark.sparkContext.parallelize(Seq(\"foo\",\"bar\")).toDF.show")
> These do not work:
> // doesn't work, fails with seq/RDD serialization error:
> interpreter.interpret("import org.apache.spark.sql.functions._\nimport
> spark.implicits._\nval upper: String => String = _.toUpperCase\nval upperUDF
> =
> udf(upper)\nspark.sparkContext.parallelize(Seq(\"foo\",\"bar\")).toDF.withColumn(\"UPPER\",
> upperUDF($\"value\")).show")
> // doesn't work, fails with seq/RDD serialization error:
> interpreter.interpret("import org.apache.spark.sql.functions._\nimport
> spark.implicits._\nval upper: String => String =
> _.toUpperCase\nspark.udf.register(\"myUpper\",
> upper)\nspark.sparkContext.parallelize(Seq(\"foo\",\"bar\")).toDF.withColumn(\"UPPER\",
> callUDF(\"myUpper\", ($\"value\"))).show")
> The not-working ones fail with this exception:
> Caused by: java.lang.ClassCastException: cannot assign instance of
> scala.collection.immutable.List$SerializationProxy to field
> org.apache.spark.rdd.RDD.org$apache$spark$rdd$RDD$$dependencies_ of type
> scala.collection.Seq in instance of org.apache.spark.rdd.MapPartitionsRDD
> at
> java.io.ObjectStreamClass$FieldReflector.setObjFieldValues(ObjectStreamClass.java:2133)
> at java.io.ObjectStreamClass.setObjFieldValues(ObjectStreamClass.java:1305)
> at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2237)
> at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:2155)
> at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2013)
> at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1535)
> at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2231)
> at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:2155)
> at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2013)
> at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1535)
> at java.io.ObjectInputStream.readObject(ObjectInputStream.java:422)
> at
> org.apache.spark.serializer.JavaDeserializationStream.readObject(JavaSerializer.scala:75)
> at
> org.apache.spark.serializer.JavaSerializerInstance.deserialize(JavaSerializer.scala:114)
> at org.apache.spark.scheduler.ResultTask.runTask(ResultTask.scala:80)
> at org.apache.spark.scheduler.Task.run(Task.scala:99)
> at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:282)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> at java.lang.Thread.run(Thread.java:745)
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