Flink: DataSource's outputs caused an error: Could not read the user code wrapper

Question

I Am just starting flink. I wrote following code and got "DataSource's outputs caused an error: Could not read the user code wrapper" error

Is there any thing I am doing wrong?

version : Flink v 0.9.1 (hadoop 1) not using hadoop: Local execution shell: scala shell

Code:

val env = ExecutionEnvironment.getExecutionEnvironment
val text = env.readTextFile("/home/ashish/Downloads/spark/synop.201501.csv"
val data_split = text.flatMap{_.split(';')}
data_split.first(3).print()

Note: The input file uses ';' as deliminator

Error:

    Scala-Flink> val data_split = text.flatMap{_.split(';')}
data_split: org.apache.flink.api.scala.DataSet[String] = org.apache.flink.api.scala.DataSet@60f70249
Scala-Flink> data_split.first(3).print()
09/24/2015 09:20:14 Job execution switched to status RUNNING.
09/24/2015 09:20:14 CHAIN DataSource (at $line26.$read$$iw$$iw$$iw$$iw$$iw$$iw$.<init>(<console>:14) (org.apache.flink.api.java.io.TextInputFormat)) -> FlatMap (FlatMap at $line27.$read$$iw$$iw$$iw$$iw$$iw$$iw$.<init>(<console>:15))(1/1) switched to SCHEDULED 
09/24/2015 09:20:14 CHAIN DataSource (at $line26.$read$$iw$$iw$$iw$$iw$$iw$$iw$.<init>(<console>:14) (org.apache.flink.api.java.io.TextInputFormat)) -> FlatMap (FlatMap at $line27.$read$$iw$$iw$$iw$$iw$$iw$$iw$.<init>(<console>:15))(1/1) switched to DEPLOYING 
09/24/2015 09:20:14 CHAIN DataSource (at $line26.$read$$iw$$iw$$iw$$iw$$iw$$iw$.<init>(<console>:14) (org.apache.flink.api.java.io.TextInputFormat)) -> FlatMap (FlatMap at $line27.$read$$iw$$iw$$iw$$iw$$iw$$iw$.<init>(<console>:15))(1/1) switched to FAILED 
java.lang.Exception: Call to registerInputOutput() of invokable failed
    at org.apache.flink.runtime.taskmanager.Task.run(Task.java:504)
    at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.RuntimeException: The initialization of the DataSource's outputs caused an error: Could not read the user code wrapper: $line27.$read$$iw$$iw$$iw$$iw$$iw$$iw$$anonfun$1
    at org.apache.flink.runtime.operators.DataSourceTask.registerInputOutput(DataSourceTask.java:89)
    at org.apache.flink.runtime.taskmanager.Task.run(Task.java:501)
    ... 1 more
Caused by: org.apache.flink.runtime.operators.util.CorruptConfigurationException: Could not read the user code wrapper: $line27.$read$$iw$$iw$$iw$$iw$$iw$$iw$$anonfun$1
    at org.apache.flink.runtime.operators.util.TaskConfig.getStubWrapper(TaskConfig.java:284)
    at org.apache.flink.runtime.operators.RegularPactTask.instantiateUserCode(RegularPactTask.java:1507)
    at org.apache.flink.runtime.operators.chaining.ChainedFlatMapDriver.setup(ChainedFlatMapDriver.java:39)
    at org.apache.flink.runtime.operators.chaining.ChainedDriver.setup(ChainedDriver.java:72)
    at org.apache.flink.runtime.operators.RegularPactTask.initOutputs(RegularPactTask.java:1378)
    at org.apache.flink.runtime.operators.DataSourceTask.initOutputs(DataSourceTask.java:290)
    at org.apache.flink.runtime.operators.DataSourceTask.registerInputOutput(DataSourceTask.java:86)
    ... 2 more
Caused by: java.lang.ClassNotFoundException: $line27.$read$$iw$$iw$$iw$$iw$$iw$$iw$$anonfun$1
    at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:348)
    at org.apache.flink.util.InstantiationUtil$ClassLoaderObjectInputStream.resolveClass(InstantiationUtil.java:71)
    at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1613)
    at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1518)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1774)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351)
    at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2000)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1924)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351)
    at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2000)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1924)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351)
    at java.io.ObjectInputStream.readObject(ObjectInputStream.java:371)
    at org.apache.flink.util.InstantiationUtil.deserializeObject(InstantiationUtil.java:302)
    at org.apache.flink.util.InstantiationUtil.readObjectFromConfig(InstantiationUtil.java:264)
    at org.apache.flink.runtime.operators.util.TaskConfig.getStubWrapper(TaskConfig.java:282)
    ... 8 more

09/24/2015 09:20:14 Job execution switched to status FAILING.
09/24/2015 09:20:14 CHAIN GroupReduce (GroupReduce at org.apache.flink.api.scala.DataSet.first(DataSet.scala:707)) -> FlatMap (collect())(1/1) switched to CANCELED 
09/24/2015 09:20:14 DataSink (collect() sink)(1/1) switched to CANCELED 
org.apache.flink.runtime.client.JobExecutionException: Job execution failed.
    at org.apache.flink.runtime.jobmanager.JobManager$$anonfun$receiveWithLogMessages$1.applyOrElse(JobManager.scala:314)
    at scala.runtime.AbstractPartialFunction$mcVL$sp.apply$mcVL$sp(AbstractPartialFunction.scala:33)
    at scala.runtime.AbstractPartialFunction$mcVL$sp.apply(AbstractPartialFunction.scala:33)
    at scala.runtime.AbstractPartialFunction$mcVL$sp.apply(AbstractPartialFunction.scala:25)
    at org.apache.flink.runtime.ActorLogMessages$$anon$1.apply(ActorLogMessages.scala:43)
    at org.apache.flink.runtime.ActorLogMessages$$anon$1.apply(ActorLogMessages.scala:29)
    at scala.PartialFunction$class.applyOrElse(PartialFunction.scala:118)
    at org.apache.flink.runtime.ActorLogMessages$$anon$1.applyOrElse(ActorLogMessages.scala:29)
    at akka.actor.Actor$class.aroundReceive(Actor.scala:465)
    at org.apache.flink.runtime.jobmanager.JobManager.aroundReceive(JobManager.scala:92)
    at akka.actor.ActorCell.receiveMessage(ActorCell.scala:516)
    at akka.actor.ActorCell.invoke(ActorCell.scala:487)
    at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:254)
    at akka.dispatch.Mailbox.run(Mailbox.scala:221)
    at akka.dispatch.Mailbox.exec(Mailbox.scala:231)
    at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)
    at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)
    at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)
    at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)
Caused by: java.lang.Exception: Call to registerInputOutput() of invokable failed
    at org.apache.flink.runtime.taskmanager.Task.run(Task.java:504)
    at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.RuntimeException: The initialization of the DataSource's outputs caused an error: Could not read the user code wrapper: $anonfun$1
    at org.apache.flink.runtime.operators.DataSourceTask.registerInputOutput(DataSourceTask.java:89)
    at org.apache.flink.runtime.taskmanager.Task.run(Task.java:501)
    ... 1 more
Caused by: org.apache.flink.runtime.operators.util.CorruptConfigurationException: Could not read the user code wrapper: $anonfun$1
    at org.apache.flink.runtime.operators.util.TaskConfig.getStubWrapper(TaskConfig.java:284)
    at org.apache.flink.runtime.operators.RegularPactTask.instantiateUserCode(RegularPactTask.java:1507)
    at org.apache.flink.runtime.operators.chaining.ChainedFlatMapDriver.setup(ChainedFlatMapDriver.java:39)
    at org.apache.flink.runtime.operators.chaining.ChainedDriver.setup(ChainedDriver.java:72)
    at org.apache.flink.runtime.operators.RegularPactTask.initOutputs(RegularPactTask.java:1378)
    at org.apache.flink.runtime.operators.DataSourceTask.initOutputs(DataSourceTask.java:290)
    at org.apache.flink.runtime.operators.DataSourceTask.registerInputOutput(DataSourceTask.java:86)
    ... 2 more
Caused by: java.lang.ClassNotFoundException: $anonfun$1
    at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:348)
    at org.apache.flink.util.InstantiationUtil$ClassLoaderObjectInputStream.resolveClass(InstantiationUtil.java:71)
    at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1613)
    at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1518)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1774)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351)
    at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2000)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1924)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351)
    at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2000)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1924)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351)
    at java.io.ObjectInputStream.readObject(ObjectInputStream.java:371)
    at org.apache.flink.util.InstantiationUtil.deserializeObject(InstantiationUtil.java:302)
    at org.apache.flink.util.InstantiationUtil.readObjectFromConfig(InstantiationUtil.java:264)
    at org.apache.flink.runtime.operators.util.TaskConfig.getStubWrapper(TaskConfig.java:282)
    ... 8 more

Answer 1

The problem is the statement "val env = ExecutionEnvironment.getExecutionEnvironment" in the first line.

The Scala Shell already has an ExecutionEnvironment, bound to the variable "env", which is configured for proper loading of the classes generated by the Shell.

By creating a new ExecutionEnvironment, you override that pre-configured environment with one that is not properly set up.