Alexander Chermenin created FLINK-5319:
------------------------------------------
Summary: ClassCastException when reusing an inherited method as
KeySelector for different classes
Key: FLINK-5319
URL: https://issues.apache.org/jira/browse/FLINK-5319
Project: Flink
Issue Type: Bug
Components: Core
Affects Versions: 1.2.0
Reporter: Alexander Chermenin
Code sample:
{code}static abstract class A {
int id;
A(int id) {this.id = id; }
int getId() { return id; }
}
static class B extends A { B(int id) { super(id % 3); } }
static class C extends A { C(int id) { super(id % 2); } }
private static B b(int id) { return new B(id); }
private static C c(int id) { return new C(id); }
/**
* Main method.
*/
public static void main(String[] args) throws Exception {
StreamExecutionEnvironment environment =
StreamExecutionEnvironment.getExecutionEnvironment();
B[] bs = IntStream.range(0, 10).mapToObj(Test::b).toArray(B[]::new);
C[] cs = IntStream.range(0, 10).mapToObj(Test::c).toArray(C[]::new);
DataStreamSource<B> bStream = environment.fromElements(bs);
DataStreamSource<C> cStream = environment.fromElements(cs);
bStream.keyBy((KeySelector<B, Integer>) A::getId).print();
cStream.keyBy((KeySelector<C, Integer>) A::getId).print();
environment.execute();
}
{code}
This code throws next exception:
{code}Exception in thread "main"
org.apache.flink.runtime.client.JobExecutionException: Job execution failed.
at
org.apache.flink.runtime.jobmanager.JobManager$$anonfun$handleMessage$1$$anonfun$applyOrElse$7.apply$mcV$sp(JobManager.scala:901)
at
org.apache.flink.runtime.jobmanager.JobManager$$anonfun$handleMessage$1$$anonfun$applyOrElse$7.apply(JobManager.scala:844)
at
org.apache.flink.runtime.jobmanager.JobManager$$anonfun$handleMessage$1$$anonfun$applyOrElse$7.apply(JobManager.scala:844)
at
scala.concurrent.impl.Future$PromiseCompletingRunnable.liftedTree1$1(Future.scala:24)
at
scala.concurrent.impl.Future$PromiseCompletingRunnable.run(Future.scala:24)
at akka.dispatch.TaskInvocation.run(AbstractDispatcher.scala:41)
at
akka.dispatch.ForkJoinExecutorConfigurator$AkkaForkJoinTask.exec(AbstractDispatcher.scala:401)
at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)
at
scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.pollAndExecAll(ForkJoinPool.java:1253)
at
scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1346)
at
scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)
at
scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)
Caused by: java.lang.RuntimeException: Could not extract key from
org.sample.flink.examples.Test$C@5e1a8111
at
org.apache.flink.streaming.runtime.io.RecordWriterOutput.collect(RecordWriterOutput.java:75)
at
org.apache.flink.streaming.runtime.io.RecordWriterOutput.collect(RecordWriterOutput.java:39)
at
org.apache.flink.streaming.api.operators.AbstractStreamOperator$CountingOutput.collect(AbstractStreamOperator.java:746)
at
org.apache.flink.streaming.api.operators.AbstractStreamOperator$CountingOutput.collect(AbstractStreamOperator.java:724)
at
org.apache.flink.streaming.api.operators.StreamSourceContexts$NonTimestampContext.collect(StreamSourceContexts.java:84)
at
org.apache.flink.streaming.api.functions.source.FromElementsFunction.run(FromElementsFunction.java:127)
at
org.apache.flink.streaming.api.operators.StreamSource.run(StreamSource.java:75)
at
org.apache.flink.streaming.api.operators.StreamSource.run(StreamSource.java:56)
at
org.apache.flink.streaming.runtime.tasks.SourceStreamTask.run(SourceStreamTask.java:56)
at
org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:269)
at org.apache.flink.runtime.taskmanager.Task.run(Task.java:655)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.RuntimeException: Could not extract key from
org.sample.flink.examples.Test$C@5e1a8111
at
org.apache.flink.streaming.runtime.partitioner.KeyGroupStreamPartitioner.selectChannels(KeyGroupStreamPartitioner.java:61)
at
org.apache.flink.streaming.runtime.partitioner.KeyGroupStreamPartitioner.selectChannels(KeyGroupStreamPartitioner.java:32)
at
org.apache.flink.runtime.io.network.api.writer.RecordWriter.emit(RecordWriter.java:83)
at
org.apache.flink.streaming.runtime.io.StreamRecordWriter.emit(StreamRecordWriter.java:86)
at
org.apache.flink.streaming.runtime.io.RecordWriterOutput.collect(RecordWriterOutput.java:72)
... 11 more
Caused by: java.lang.ClassCastException: org.sample.flink.examples.Test$C
cannot be cast to org.sample.flink.examples.Test$B
at
org.apache.flink.streaming.runtime.partitioner.KeyGroupStreamPartitioner.selectChannels(KeyGroupStreamPartitioner.java:59)
... 15 more{code}
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