[SPARK-1577] GraphX mapVertices with KryoSerialization

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.0.0
• Component/s: GraphX
• Assignee: Ankur Dave
• Reporter: Joseph E. Gonzalez
• Created: 23/Apr/14 00:02
• Updated: 26/May/14 20:20
• Resolved: 26/May/14 20:20

Description

If Kryo is enabled by setting:

SPARK_JAVA_OPTS+="-Dspark.serializer=org.apache.spark.serializer.KryoSerializer "
SPARK_JAVA_OPTS+="-Dspark.kryo.registrator=org.apache.spark.graphx.GraphKryoRegistrator  "

in conf/spark_env.conf and running the following block of code in the shell:

import org.apache.spark.graphx._
import org.apache.spark.graphx.lib._
import org.apache.spark.rdd.RDD

val vertexArray = Array(
  (1L, ("Alice", 28)),
  (2L, ("Bob", 27)),
  (3L, ("Charlie", 65)),
  (4L, ("David", 42)),
  (5L, ("Ed", 55)),
  (6L, ("Fran", 50))
  )
val edgeArray = Array(
  Edge(2L, 1L, 7),
  Edge(2L, 4L, 2),
  Edge(3L, 2L, 4),
  Edge(3L, 6L, 3),
  Edge(4L, 1L, 1),
  Edge(5L, 2L, 2),
  Edge(5L, 3L, 8),
  Edge(5L, 6L, 3)
  )

val vertexRDD: RDD[(Long, (String, Int))] = sc.parallelize(vertexArray)
val edgeRDD: RDD[Edge[Int]] = sc.parallelize(edgeArray)

val graph: Graph[(String, Int), Int] = Graph(vertexRDD, edgeRDD)

// Define a class to more clearly model the user property
case class User(name: String, age: Int, inDeg: Int, outDeg: Int)

// Transform the graph
val userGraph = graph.mapVertices{ case (id, (name, age)) => User(name, age, 0, 0) }

The following block of code works:

userGraph.vertices.count

and the following block of code generates a Kryo error:

userGraph.vertices.collect

There error:

java.lang.StackOverflowError
	at sun.reflect.UnsafeFieldAccessorImpl.ensureObj(UnsafeFieldAccessorImpl.java:54)
	at sun.reflect.UnsafeQualifiedObjectFieldAccessorImpl.get(UnsafeQualifiedObjectFieldAccessorImpl.java:38)
	at java.lang.reflect.Field.get(Field.java:379)
	at com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.write(FieldSerializer.java:552)
	at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:213)
	at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:501)
	at com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.write(FieldSerializer.java:564)
	at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:213)
	at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:501)
	at com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.write(FieldSerializer.java:564)
	at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:213)
	at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:501)
	at com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.write(FieldSerializer.java:564)
	at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:213)
	at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:501)