[jira] [Commented] (FLINK-958) Sorting a group when key is a Writable gives a NonSerializable Error

[Shang Yuanchun (Jira)]

    [ https://issues.apache.org/jira/browse/FLINK-958?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14038580#comment-14038580 ]

Artem Tsikiridis commented on FLINK-958:
----------------------------------------

Hello, here is the full one:

{code}
java.io.NotSerializableException: sun.misc.Launcher$AppClassLoader
        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)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
        at java.io.ObjectOutputStream.writeArray(ObjectOutputStream.java:1377)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1173)
        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 eu.stratosphere.util.InstantiationUtil.serializeObject(InstantiationUtil.java:256)
        at eu.stratosphere.util.InstantiationUtil.writeObjectToConfig(InstantiationUtil.java:232)
        at eu.stratosphere.api.java.typeutils.runtime.RuntimeComparatorFactory.writeParametersToConfig(RuntimeComparatorFactory.java:40)
        at eu.stratosphere.pact.runtime.task.util.TaskConfig.setTypeComparatorFactory(TaskConfig.java:1055)
        at eu.stratosphere.pact.runtime.task.util.TaskConfig.setInputComparator(TaskConfig.java:404)
        at eu.stratosphere.compiler.plantranslate.NepheleJobGraphGenerator.addLocalInfoFromChannelToConfig(NepheleJobGraphGenerator.java:1114)
        at eu.stratosphere.compiler.plantranslate.NepheleJobGraphGenerator.translateChannel(NepheleJobGraphGenerator.java:693)
        at eu.stratosphere.compiler.plantranslate.NepheleJobGraphGenerator.postVisit(NepheleJobGraphGenerator.java:548)
        at eu.stratosphere.compiler.plantranslate.NepheleJobGraphGenerator.postVisit(NepheleJobGraphGenerator.java:98)
        at eu.stratosphere.compiler.plan.SingleInputPlanNode.accept(SingleInputPlanNode.java:146)
        at eu.stratosphere.compiler.plan.SingleInputPlanNode.accept(SingleInputPlanNode.java:140)
        at eu.stratosphere.compiler.plan.OptimizedPlan.accept(OptimizedPlan.java:159)
        at eu.stratosphere.compiler.plantranslate.NepheleJobGraphGenerator.compileJobGraph(NepheleJobGraphGenerator.java:168)
        at eu.stratosphere.test.util.JavaProgramTestBase$TestEnvironment.execute(JavaProgramTestBase.java:137)
{code}

> Sorting a group when key is a Writable gives a NonSerializable Error
> --------------------------------------------------------------------
>
>                 Key: FLINK-958
>                 URL: https://issues.apache.org/jira/browse/FLINK-958
>             Project: Flink
>          Issue Type: Bug
>          Components: Hadoop Compatibility, Java API
>            Reporter: Artem Tsikiridis
>
> I cannot sort an unsorted group by key when the key Is a Writable. Is it a bug?
> Consider:
> {code}
> Grouping<Tuple2<Text, LongWritable>> res = myData
> .map(new MapFunction<Tuple2<String, Long>, Tuple2<Text, LongWritable>>() {
> @Override
> public Tuple2<Text, LongWritable> map(
> Tuple2<String, Long> value) throws Exception {
> return new Tuple2<Text, LongWritable>(new Text(value.f0), new LongWritable(value.f1));
> }
> })
> .groupBy(0).sortGroup(0, Order.ASCENDING);
> {code}
> This gives the following stacktrace:
> {code}
> Caused by: java.io.NotSerializableException: sun.misc.Launcher$AppClassLoader
> 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)
> at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
> at java.io.ObjectOutputStream.writeArray(ObjectOutputStream.java:1377)
> at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1173)
> 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 eu.stratosphere.util.InstantiationUtil.serializeObject(InstantiationUtil.java:250)
> at eu.stratosphere.util.InstantiationUtil.writeObjectToConfig(InstantiationUtil.java:231)
> at eu.stratosphere.api.java.typeutils.runtime.RuntimeComparatorFactory.writeParametersToConfig(RuntimeComparatorFactory.java:40)
> ... 14 more
> {code}
> Is it not supported to sort groupings with writables as keys? I understand this is a hadoop serialization error, but so far I am not able to fix it.
> Any ideas?

... [show rest of quote]

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