Peter Ertl created FLINK-7567:
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Summary: DataStream#iterate() on env.fromElements() / env.fromCollection() does not work
Key: FLINK-7567
URL:
https://issues.apache.org/jira/browse/FLINK-7567 Project: Flink
Issue Type: Bug
Components: DataStream API
Affects Versions: 1.3.2
Environment: OS X 10.12.6, Oracle JDK 1.8.0_144, Flink 1.3.2
Reporter: Peter Ertl
When I try to execute this simple snippet of code
{code}
@Test
def iterateOnElements(): Unit = {
val env = StreamExecutionEnvironment.getExecutionEnvironment
// do something silly just do get iteration going ...
val result = env.fromElements(1, 2, 3).iterate(it => {
(it.filter(_ > 0).map(_ - 1), it.filter(_ > 0).map(_ => 'x'))
})
result.print()
env.execute()
}
{code}
I get the following exception:
{code}
java.lang.UnsupportedOperationException: Parallelism of the feedback stream must match the parallelism of the original stream. Parallelism of original stream: 1; parallelism of feedback stream: 8
at org.apache.flink.streaming.api.transformations.FeedbackTransformation.addFeedbackEdge(FeedbackTransformation.java:87)
at org.apache.flink.streaming.api.datastream.IterativeStream.closeWith(IterativeStream.java:77)
at org.apache.flink.streaming.api.scala.DataStream.iterate(DataStream.scala:519)
at atp.analytics.CassandraReadTest.iterate2(CassandraReadTest.scala:134)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)
{code}
Since is just the simplest iterating stream setup I could imagine this error makes no sense to me :-P
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