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From "Marek Barak (JIRA)" <j...@apache.org>
Subject [jira] [Created] (FLINK-8405) Keyed State in broadcasted data steam.
Date Wed, 10 Jan 2018 13:25:00 GMT
Marek Barak created FLINK-8405:
----------------------------------

             Summary: Keyed State in broadcasted data steam. 
                 Key: FLINK-8405
                 URL: https://issues.apache.org/jira/browse/FLINK-8405
             Project: Flink
          Issue Type: Bug
            Reporter: Marek Barak


Hi guys,

I am trying to join 2 streams. Where the second stream is an codelist used by the first stream
for enrichment. I followed the guide described here:

https://www.safaribooksonline.com/library/view/stream-processing-with/9781491974285/ch04.html

With the distinction that instead of having an local HashMap, i used MapState. This part is
actually important since i want my state properly checkpointed in cases of a failure. I managed
to reproduce the issue with the following code: 

{code}
import org.apache.flink.api.common.state.{MapState, MapStateDescriptor}
import org.apache.flink.configuration.Configuration
import org.apache.flink.streaming.api.functions.co.RichCoFlatMapFunction
import org.apache.flink.streaming.api.scala.StreamExecutionEnvironment
import org.apache.flink.streaming.util.StreamingMultipleProgramsTestBase
import org.apache.flink.util.Collector
import org.apache.flink.streaming.api.scala._
import org.junit.{Test, Assert }

class SimpleTest extends StreamingMultipleProgramsTestBase {


  val env = StreamExecutionEnvironment.getExecutionEnvironment


  case object StateMap extends RichCoFlatMapFunction[String, (String, Int), Int] {

    var codeList: MapState[String,Int] = _

    override def open(parameters: Configuration): Unit = {
      codeList = getRuntimeContext.getMapState(
        new MapStateDescriptor[String,Int]("test", classOf[String], classOf[Int])

      )
    }

    override def flatMap1(value: String, out: Collector[Int]): Unit = {
      val res = if(codeList.contains(value)) codeList.get(value) else 0

      out.collect(res)
    }

    override def flatMap2(value: (String, Int), out: Collector[Int]): Unit = {
      codeList.put(value._1, value._2)
      out.close()
    }
  }

  @Test
  def job() = {

    val inputStream = env.fromCollection(List("Some", "Some2", "Some3"))
    val dictStream = env.fromCollection(List("Some" -> 1, "Some2" -> 2, "Some3" ->
3))

    inputStream
      .connect(dictStream.broadcast)
      .flatMap(StateMap)

    env.execute()
    Assert.assertEquals(1, 1)
  }
}
{code}

I always get the following issue:

{code}
rg.apache.flink.runtime.client.JobExecutionException: Job execution failed.

	at org.apache.flink.runtime.jobmanager.JobManager$$anonfun$handleMessage$1$$anonfun$applyOrElse$6.apply$mcV$sp(JobManager.scala:897)
	at org.apache.flink.runtime.jobmanager.JobManager$$anonfun$handleMessage$1$$anonfun$applyOrElse$6.apply(JobManager.scala:840)
	at org.apache.flink.runtime.jobmanager.JobManager$$anonfun$handleMessage$1$$anonfun$applyOrElse$6.apply(JobManager.scala:840)
	at scala.concurrent.impl.Future$PromiseCompletingRunnable.liftedTree1$1(Future.scala:24)
	at scala.concurrent.impl.Future$PromiseCompletingRunnable.run(Future.scala:24)
	at akka.dispatch.TaskInvocation.run(AbstractDispatcher.scala:39)
	at akka.dispatch.ForkJoinExecutorConfigurator$AkkaForkJoinTask.exec(AbstractDispatcher.scala:415)
	at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)
	at scala.concurrent.forkjoin.ForkJoinPool$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.NullPointerException: Keyed state can only be used on a 'keyed stream',
i.e., after a 'keyBy()' operation.
	at org.apache.flink.util.Preconditions.checkNotNull(Preconditions.java:75)
	at org.apache.flink.streaming.api.operators.StreamingRuntimeContext.checkPreconditionsAndGetKeyedStateStore(StreamingRuntimeContext.java:161)
	at org.apache.flink.streaming.api.operators.StreamingRuntimeContext.getMapState(StreamingRuntimeContext.java:153)
	at com.triviadata.sherlog.streaming.job.SimpleTest$StateMap$.open(SimpleTest.scala:23)
	at org.apache.flink.api.common.functions.util.FunctionUtils.openFunction(FunctionUtils.java:36)
	at org.apache.flink.streaming.api.operators.AbstractUdfStreamOperator.open(AbstractUdfStreamOperator.java:102)
	at org.apache.flink.streaming.api.operators.co.CoStreamFlatMap.open(CoStreamFlatMap.java:46)
	at org.apache.flink.streaming.runtime.tasks.StreamTask.openAllOperators(StreamTask.java:393)
	at org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:254)
	at org.apache.flink.runtime.taskmanager.Task.run(Task.java:718)
	at java.lang.Thread.run(Thread.java:745)
{code}

I guess the main problem is:

{code}
Caused by: java.lang.NullPointerException: Keyed state can only be used on a 'keyed stream',
i.e., after a 'keyBy()' operation.
{code}

FYI:
I am running:
OSX 10.13.1
Java: Oracle 1.8.0_92
Scala: 2.11.11
Fink: 1.3.2, also tried 1.4.0 but got the same problem.



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