We should try to improve the exception here. More people will run into this issue and the exception should help them understand it well.
How about we do eager serialization into a set of byte arrays? Then the serializability issue comes immediately when the program is constructed, rather than later, when it is shipped. On Wed, Sep 2, 2015 at 12:56 PM, Maximilian Michels <m...@apache.org> wrote: > Here's the JIRA issue: https://issues.apache.org/jira/browse/FLINK-2608 > > On Wed, Sep 2, 2015 at 12:49 PM, Maximilian Michels <m...@apache.org> > wrote: > >> Hi Andreas, >> >> Thank you for reporting the problem and including the code to reproduce >> the problem. I think there is a problem with the class serialization or >> deserialization. Arrays.asList uses a private ArrayList class >> (java.util.Arrays$ArrayList) which is not the one you would normally use >> (java.util.ArrayList). >> >> I'll create a JIRA issue to keep track of the problem and to investigate >> further. >> >> Best regards, >> Max >> >> Here's the stack trace: >> >> Exception in thread "main" >> org.apache.flink.runtime.client.JobExecutionException: Cannot initialize >> task 'DataSource (at main(Test.java:32) >> (org.apache.flink.api.java.io.CollectionInputFormat))': Deserializing the >> InputFormat ([mytests.Test$TestClass@4d6025c5]) failed: unread block data >> at >> org.apache.flink.runtime.jobmanager.JobManager$$anonfun$org$apache$flink$runtime$jobmanager$JobManager$$submitJob$4.apply(JobManager.scala:523) >> at >> org.apache.flink.runtime.jobmanager.JobManager$$anonfun$org$apache$flink$runtime$jobmanager$JobManager$$submitJob$4.apply(JobManager.scala:507) >> at scala.collection.Iterator$class.foreach(Iterator.scala:727) >> at scala.collection.AbstractIterator.foreach(Iterator.scala:1157) >> at scala.collection.IterableLike$class.foreach(IterableLike.scala:72) >> at scala.collection.AbstractIterable.foreach(Iterable.scala:54) >> at org.apache.flink.runtime.jobmanager.JobManager.org >> $apache$flink$runtime$jobmanager$JobManager$$submitJob(JobManager.scala:507) >> at >> org.apache.flink.runtime.jobmanager.JobManager$$anonfun$receiveWithLogMessages$1.applyOrElse(JobManager.scala:190) >> at >> scala.runtime.AbstractPartialFunction$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$$anon$1.applyOrElse(ActorLogMessages.scala:29) >> at akka.actor.Actor$class.aroundReceive(Actor.scala:465) >> at >> org.apache.flink.runtime.jobmanager.JobManager.aroundReceive(JobManager.scala:92) >> at akka.actor.ActorCell.receiveMessage(ActorCell.scala:516) >> at akka.actor.ActorCell.invoke(ActorCell.scala:487) >> at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:254) >> at akka.dispatch.Mailbox.run(Mailbox.scala:221) >> at akka.dispatch.Mailbox.exec(Mailbox.scala:231) >> at >> scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260) >> at >> scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339) >> at >> scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979) >> at >> scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107) >> Caused by: java.lang.Exception: Deserializing the InputFormat >> ([mytests.Test$TestClass@4d6025c5]) failed: unread block data >> at >> org.apache.flink.runtime.jobgraph.InputFormatVertex.initializeOnMaster(InputFormatVertex.java:60) >> at >> org.apache.flink.runtime.jobmanager.JobManager$$anonfun$org$apache$flink$runtime$jobmanager$JobManager$$submitJob$4.apply(JobManager.scala:520) >> ... 25 more >> Caused by: java.lang.IllegalStateException: unread block data >> at >> java.io.ObjectInputStream$BlockDataInputStream.setBlockDataMode(ObjectInputStream.java:2424) >> at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1383) >> at >> java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1993) >> at >> java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1918) >> 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) >> at >> org.apache.flink.runtime.jobgraph.InputFormatVertex.initializeOnMaster(InputFormatVertex.java:57) >> ... 26 more >> >> On Wed, Sep 2, 2015 at 11:17 AM, Andres R. Masegosa <and...@cs.aau.dk> >> wrote: >> >>> Hi, >>> >>> I get a bug when trying to broadcast a list of integers created with the >>> primitive "Arrays.asList(...)". >>> >>> For example, if you try to run this "wordcount" example, you can >>> reproduce the bug. >>> >>> >>> public class WordCountExample { >>> public static void main(String[] args) throws Exception { >>> final ExecutionEnvironment env = >>> ExecutionEnvironment.getExecutionEnvironment(); >>> >>> DataSet<String> text = env.fromElements( >>> "Who's there?", >>> "I think I hear them. Stand, ho! Who's there?"); >>> >>> List<Integer> elements = Arrays.asList(0, 0, 0); >>> >>> DataSet<TestClass> set = env.fromElements(new >>> TestClass(elements)); >>> >>> DataSet<Tuple2<String, Integer>> wordCounts = text >>> .flatMap(new LineSplitter()) >>> .withBroadcastSet(set, "set") >>> .groupBy(0) >>> .sum(1); >>> >>> wordCounts.print(); >>> } >>> >>> public static class LineSplitter implements FlatMapFunction<String, >>> Tuple2<String, Integer>> { >>> @Override >>> public void flatMap(String line, Collector<Tuple2<String, >>> Integer>> out) { >>> for (String word : line.split(" ")) { >>> out.collect(new Tuple2<String, Integer>(word, 1)); >>> } >>> } >>> } >>> >>> public static class TestClass implements Serializable { >>> private static final long serialVersionUID = >>> -2932037991574118651L; >>> >>> List<Integer> integerList; >>> public TestClass(List<Integer> integerList){ >>> this.integerList=integerList; >>> } >>> >>> >>> } >>> } >>> >>> >>> However, if instead of using the primitive "Arrays.asList(...)", we use >>> instead the ArrayList<> constructor, there is any problem!!!! >>> >>> >>> Regards, >>> Andres >>> >> >> >
