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From "Peter Ertl (JIRA)" <j...@apache.org>
Subject [jira] [Created] (FLINK-7567) DataStream#iterate() on env.fromElements() / env.fromCollection() does not work
Date Fri, 01 Sep 2017 09:36:00 GMT
Peter Ertl created FLINK-7567:
---------------------------------

             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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