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From Maximilian Alber <alber.maximil...@gmail.com>
Subject Re: Random Selection
Date Mon, 15 Jun 2015 15:31:10 GMT
Hi everyone!
Thanks! It seems the variable that makes the problems. Making an inner
class solved the issue.
Cheers,
Max

On Mon, Jun 15, 2015 at 2:58 PM, Kruse, Sebastian <Sebastian.Kruse@hpi.de>
wrote:

>  Hi everyone,
>
>
>
> I did not reenact it, but I think the problem here is rather the anonymous
> class. It looks like it is created within a class, not an object. Thus it
> is not “static” in Java terms, which means that also its surrounding class
> (the job class) will be serialized. And in this job class, there seems to
> be a DataSet field, that cannot be serialized.
>
>
>
> If that really is the problem, you should either define your anonymous
> class within the companion object of your job class or resort directly to a
> function (and make sure that you do not pass a variable from your job class
> into the scope of the function).
>
>
>
> Cheers,
>
> Sebastian
>
>
>
> *From:* Till Rohrmann [mailto:trohrmann@apache.org]
> *Sent:* Montag, 15. Juni 2015 14:16
> *To:* user@flink.apache.org
> *Subject:* Re: Random Selection
>
>
>
> Hi Max,
>
> the problem is that you’re trying to serialize the companion object of
> scala.util.Random. Try to create an instance of the scala.util.Random
> class and use this instance within your RIchFilterFunction to generate
> the random numbers.
>
> Cheers,
> Till
>
> On Mon, Jun 15, 2015 at 1:56 PM Maximilian Alber
> alber.maximilian@gmail.com <http://mailto:alber.maximilian@gmail.com>
> wrote:
>
>    Hi Flinksters,
>
> I would like to randomly choose a element of my data set. But somehow I
> cannot use scala.util inside my filter functions:
>
>       val sample_x = X filter(new RichFilterFunction[Vector](){
>         var i: Int = -1
>
>         override def open(config: Configuration) = {
>           i = scala.util.Random.nextInt(N)
>         }
>         def filter(a: Vector) = a.id == i
>       })
>       val sample_y = Y filter(new RichFilterFunction[Vector](){
>         def filter(a: Vector) = a.id == scala.util.Random.nextInt(N)
>       })
>
> That's the error I get:
>
> Exception in thread "main" org.apache.flink.optimizer.CompilerException:
> An error occurred while translating the optimized plan to a nephele
> JobGraph: Error translating node 'Filter "Filter at
> Test$anonfun$10.apply(test.scala:276)" : FLAT_MAP [[ GlobalProperties
> [partitioning=RANDOM_PARTITIONED] ]] [[ LocalProperties [ordering=null,
> grouped=null, unique=null] ]]': Could not write the user code wrapper class
> org.apache.flink.api.common.operators.util.UserCodeObjectWrapper :
> java.io.NotSerializableException: org.apache.flink.api.scala.DataSet
>     at
> org.apache.flink.optimizer.plantranslate.JobGraphGenerator.postVisit(JobGraphGenerator.java:578)
>     at
> org.apache.flink.optimizer.plantranslate.JobGraphGenerator.postVisit(JobGraphGenerator.java:103)
>     at
> org.apache.flink.optimizer.plan.SingleInputPlanNode.accept(SingleInputPlanNode.java:205)
>     at
> org.apache.flink.optimizer.plan.SingleInputPlanNode.accept(SingleInputPlanNode.java:199)
>     at
> org.apache.flink.optimizer.plan.SingleInputPlanNode.accept(SingleInputPlanNode.java:199)
>     at
> org.apache.flink.optimizer.plan.OptimizedPlan.accept(OptimizedPlan.java:127)
>     at
> org.apache.flink.optimizer.plantranslate.JobGraphGenerator.compileJobGraph(JobGraphGenerator.java:170)
>     at
> org.apache.flink.client.LocalExecutor.executePlan(LocalExecutor.java:176)
>     at
> org.apache.flink.api.java.LocalEnvironment.execute(LocalEnvironment.java:54)
>     at
> org.apache.flink.api.java.ExecutionEnvironment.execute(ExecutionEnvironment.java:789)
>     at
> org.apache.flink.api.scala.ExecutionEnvironment.execute(ExecutionEnvironment.scala:576)
>     at org.apache.flink.api.scala.DataSet.collect(DataSet.scala:544)
>     at Test$delayedInit$body.apply(test.scala:304)
>     at scala.Function0$class.apply$mcV$sp(Function0.scala:40)
>     at
> scala.runtime.AbstractFunction0.apply$mcV$sp(AbstractFunction0.scala:12)
>     at scala.App$anonfun$main$1.apply(App.scala:71)
>     at scala.App$anonfun$main$1.apply(App.scala:71)
>     at scala.collection.immutable.List.foreach(List.scala:318)
>     at
> scala.collection.generic.TraversableForwarder$class.foreach(TraversableForwarder.scala:32)
>     at scala.App$class.main(App.scala:71)
>     at Test$.main(test.scala:45)
>     at Test.main(test.scala)
> Caused by: org.apache.flink.optimizer.CompilerException: Error translating
> node 'Filter "Filter at Test$anonfun$10.apply(test.scala:276)" : FLAT_MAP
> [[ GlobalProperties [partitioning=RANDOM_PARTITIONED] ]] [[ LocalProperties
> [ordering=null, grouped=null, unique=null] ]]': Could not write the user
> code wrapper class
> org.apache.flink.api.common.operators.util.UserCodeObjectWrapper :
> java.io.NotSerializableException: org.apache.flink.api.scala.DataSet
>     at
> org.apache.flink.optimizer.plantranslate.JobGraphGenerator.preVisit(JobGraphGenerator.java:360)
>     at
> org.apache.flink.optimizer.plantranslate.JobGraphGenerator.preVisit(JobGraphGenerator.java:103)
>     at
> org.apache.flink.optimizer.plan.SingleInputPlanNode.accept(SingleInputPlanNode.java:198)
>     at
> org.apache.flink.optimizer.plan.SingleInputPlanNode.accept(SingleInputPlanNode.java:202)
>     at
> org.apache.flink.optimizer.plan.BulkIterationPlanNode.acceptForStepFunction(BulkIterationPlanNode.java:137)
>     at
> org.apache.flink.optimizer.plantranslate.JobGraphGenerator.postVisit(JobGraphGenerator.java:427)
>     ... 21 more
> Caused by:
> org.apache.flink.runtime.operators.util.CorruptConfigurationException:
> Could not write the user code wrapper class
> org.apache.flink.api.common.operators.util.UserCodeObjectWrapper :
> java.io.NotSerializableException: org.apache.flink.api.scala.DataSet
>     at
> org.apache.flink.runtime.operators.util.TaskConfig.setStubWrapper(TaskConfig.java:275)
>     at
> org.apache.flink.optimizer.plantranslate.JobGraphGenerator.createSingleInputVertex(JobGraphGenerator.java:803)
>     at
> org.apache.flink.optimizer.plantranslate.JobGraphGenerator.preVisit(JobGraphGenerator.java:305)
>     ... 26 more
> Caused by: java.io.NotSerializableException:
> org.apache.flink.api.scala.DataSet
>     at
> java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1183)
>     at
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>     at
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>     at
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>     aio.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>     at
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>     at
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>     at
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>     at
> java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>     at
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>     at
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>     at
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>     at
> java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>     at
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547)
>     at
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508)
>     at
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
>     at
> java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
>     at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
>     at
> org.apache.flink.util.InstantiationUtil.serializeObject(InstantiationUtil.java:314)
>     at
> org.apache.flink.util.InstantiationUtil.writeObjectToConfig(InstantiationUtil.java:268)
>     at
> org.apache.flink.runtime.operators.util.TaskConfig.setStubWrapper(TaskConfig.java:273)
>
>  Did I miss something or it is simply not possible?
>
> Thanks!
>
> Cheers,
>
> Max
>
>  ​
>

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