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From Michal Monselise <michal.monsel...@gmail.com>
Subject Extending GraphFrames without running into serialization issues
Date Tue, 05 Jan 2021 19:08:38 GMT
Hi,

I am trying to extend GraphFrames and create my own class that has some
additional graph functionality.

To simplify for this example, I have created a class that doesn't contain
any functions. All it does is just extend GraphFrames:

import org.apache.spark.sql.DataFrameimport org.graphframes._
class NewGraphFrame(@transient private val _vertices: DataFrame,
                    @transient private val _edges: DataFrame) extends
GraphFrame {

}
val vertices = Seq(
  (1, "John"),
  (2, "Jane"),
  (3, "Karen")
).toDF("id", "name")
val edges = Seq(
  (1, 3),
  (2, 3),
  (2, 1)
).toDF("src", "dst")
val g = new NewGraphFrame(vertices, edges)

When I run this code in the REPL, I get the following error:

java.lang.Exception: You cannot use GraphFrame objects within a Spark closure
  at org.graphframes.GraphFrame.vertices(GraphFrame.scala:125)
  at org.graphframes.GraphFrame.toString(GraphFrame.scala:55)
  at scala.runtime.ScalaRunTime$.scala$runtime$ScalaRunTime$$inner$1(ScalaRunTime.scala:332)
  at scala.runtime.ScalaRunTime$.stringOf(ScalaRunTime.scala:337)
  at scala.runtime.ScalaRunTime$.replStringOf(ScalaRunTime.scala:345)
  at .$print$lzycompute(<console>:10)
  at .$print(<console>:6)
  at $print(<console>)
  at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
  at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
  at java.lang.reflect.Method.invoke(Method.java:498)
  at scala.tools.nsc.interpreter.IMain$ReadEvalPrint.call(IMain.scala:786)
  at scala.tools.nsc.interpreter.IMain$Request.loadAndRun(IMain.scala:1047)
  at scala.tools.nsc.interpreter.IMain$WrappedRequest$$anonfun$loadAndRunReq$1.apply(IMain.scala:638)
  at scala.tools.nsc.interpreter.IMain$WrappedRequest$$anonfun$loadAndRunReq$1.apply(IMain.scala:637)
  at scala.reflect.internal.util.ScalaClassLoader$class.asContext(ScalaClassLoader.scala:31)
  at scala.reflect.internal.util.AbstractFileClassLoader.asContext(AbstractFileClassLoader.scala:19)
  at scala.tools.nsc.interpreter.IMain$WrappedRequest.loadAndRunReq(IMain.scala:637)
  at scala.tools.nsc.interpreter.IMain.interpret(IMain.scala:569)
  at scala.tools.nsc.interpreter.IMain.interpret(IMain.scala:565)
  at scala.tools.nsc.interpreter.ILoop.interpretStartingWith(ILoop.scala:807)
  at scala.tools.nsc.interpreter.ILoop.command(ILoop.scala:681)
  at scala.tools.nsc.interpreter.ILoop.processLine(ILoop.scala:395)
  at scala.tools.nsc.interpreter.ILoop.loop(ILoop.scala:415)
  at scala.tools.nsc.interpreter.ILoop$$anonfun$process$1.apply$mcZ$sp(ILoop.scala:923)
  at scala.tools.nsc.interpreter.ILoop$$anonfun$process$1.apply(ILoop.scala:909)
  at scala.tools.nsc.interpreter.ILoop$$anonfun$process$1.apply(ILoop.scala:909)
  at scala.reflect.internal.util.ScalaClassLoader$.savingContextLoader(ScalaClassLoader.scala:97)
  at scala.tools.nsc.interpreter.ILoop.process(ILoop.scala:909)
  at org.apache.spark.repl.Main$.doMain(Main.scala:76)
  at org.apache.spark.repl.Main$.main(Main.scala:56)
  at org.apache.spark.repl.Main.main(Main.scala)
  at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
  at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
  at java.lang.reflect.Method.invoke(Method.java:498)
  at org.apache.spark.deploy.JavaMainApplication.start(SparkApplication.scala:52)
  at org.apache.spark.deploy.SparkSubmit$.org$apache$spark$deploy$SparkSubmit$$runMain(SparkSubmit.scala:894)
  at org.apache.spark.deploy.SparkSubmit$.doRunMain$1(SparkSubmit.scala:198)
  at org.apache.spark.deploy.SparkSubmit$.submit(SparkSubmit.scala:228)
  at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:137)
  at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala)

I know that this means that I'm serializing twice. However, I am obviously
not interested in doing that. I simply want to extend this class so that I
can use the graph functionality in my class. How do I extend this class
without the spark repl throwing this error?

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