[jira] [Created] (FLINK-2608) Arrays.asList(..) does not work with CollectionInputFormat

["Maximilian Michels (JIRA)" <ji...@apache.org>]

Maximilian Michels created FLINK-2608:
-----------------------------------------

             Summary: Arrays.asList(..) does not work with CollectionInputFormat
                 Key: FLINK-2608
                 URL: https://issues.apache.org/jira/browse/FLINK-2608
             Project: Flink
          Issue Type: Bug
          Components: Type Serialization System
    Affects Versions: 0.9, 0.10
            Reporter: Maximilian Michels
            Priority: Minor
             Fix For: 0.10


When using Arrays.asList(..) as input for a CollectionInputFormat, the serialization/deserialization fails when deploying the task.

See the following program:

{code:java}
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?");

        // DOES NOT WORK
        List<Integer> elements = Arrays.asList(0, 0, 0);
        // The following works:
        //List<Integer> elements = new ArrayList<>(new int[] {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;
        }


    }
{code}

{noformat}
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
{noformat}



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