Fred Teunissen created FLINK-9149:
-
Summary: The creation of the ExecutionPlan fails when you combine
a SideOutput with an SplitStream.
Key: FLINK-9149
URL: https://issues.apache.org/jira/browse/FLINK-9149
Project: Flink
Issue Type: Bug
Components: DataStream API
Affects Versions: 1.4.2
Reporter: Fred Teunissen
The creation of the ExecutionPlan fails when you combine a SideOutput with an
SplitStream.
Code:
{code:java}
import org.apache.flink.streaming.api.functions.ProcessFunction
import org.apache.flink.streaming.api.scala._
import org.apache.flink.util.Collector
object SideOutputTest {
def main(args: Array[String]) {
val env = StreamExecutionEnvironment.getExecutionEnvironment
env.setParallelism(3)
val inputLongStream = env.generateSequence(0L, 100L)
val filteredLongStream = inputLongStream.process(new LogFilterFunction)
val splittedLongStream = filteredLongStream.split(l => Seq((l%4).toString))
// workaround
// val splittedLongStream = filteredLongStream.map(x=>x).split(l =>
Seq((l%4).toString))
val oneStream = splittedLongStream.select("1").map(l => l+1000)
val twoStream = splittedLongStream.select("2").map(l => l+2000)
val threeStream = splittedLongStream.select("3").map(l => l+3000)
oneStream.union(twoStream, threeStream).print()
val loggingStream = filteredLongStream.getSideOutput(loggingOutputTag)
loggingStream.print()
println(env.getExecutionPlan)
env.execute()
}
val loggingOutputTag = OutputTag[String]("loggingStream")
}
class LogFilterFunction extends ProcessFunction[Long, Long] {
override def processElement(value: Long, ctx: ProcessFunction[Long,
Long]#Context, out: Collector[Long]): Unit = {
if (value % 4 == 0) {
ctx.output(SideOutputTest.loggingOutputTag, s"LogFilterFunction logging
for $value")
}else {
out.collect(value)
}
}
}
{code}
Exception:
{noformat}
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$6.apply$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
at
org.apache.flink.streaming.api.collector.selector.DirectedOutput.(DirectedOutput.java:74)
at
org.apache.flink.streaming.runtime.tasks.OperatorChain.createOutputCollector(OperatorChain.java:331)
at
org.apache.flink.streaming.runtime.tasks.OperatorChain.createChainedOperator(OperatorChain.java:346)
at
org.apache.flink.streaming.runtime.tasks.OperatorChain.createOutputCollector(OperatorChain.java:282)
at
org.apache.flink.streaming.runtime.tasks.OperatorChain.(OperatorChain.java:126)
at
org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:231)
at org.apache.flink.runtime.taskmanager.Task.run(Task.java:718)
at java.lang.Thread.run(Thread.java:748)
{noformat}
Workaround:
add a redundant *map(x=>x)* before the *split* function.
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