I guess the intended behavior here is to just throw a nicer error, as you cannot really join two data streams.
2015-02-20 16:41 GMT+01:00 Daniel Bali (JIRA) <j...@apache.org>: > Daniel Bali created FLINK-1594: > ---------------------------------- > > Summary: DataStreams don't support self-join > Key: FLINK-1594 > URL: https://issues.apache.org/jira/browse/FLINK-1594 > Project: Flink > Issue Type: Bug > Components: Streaming > Affects Versions: 0.9 > Environment: flink-0.9.0-SNAPSHOT > Reporter: Daniel Bali > > > Trying to join a DataSets with itself will result in exceptions. I get the > following stack trace: > > {noformat} > java.lang.Exception: Error setting up runtime environment: Union > buffer reader must be initialized with at least two individual buffer > readers > at > org.apache.flink.runtime.execution.RuntimeEnvironment.<init>(RuntimeEnvironment.java:173) > at org.apache.flink.runtime.taskmanager.TaskManager.org > $apache$flink$runtime$taskmanager$TaskManager$$submitTask(TaskManager.scala:419) > at > org.apache.flink.runtime.taskmanager.TaskManager$$anonfun$receiveWithLogMessages$1.applyOrElse(TaskManager.scala:261) > at > scala.runtime.AbstractPartialFunction$mcVL$sp.apply$mcVL$sp(AbstractPartialFunction.scala:33) > at > scala.runtime.AbstractPartialFunction$mcVL$sp.apply(AbstractPartialFunction.scala:33) > at > scala.runtime.AbstractPartialFunction$mcVL$sp.apply(AbstractPartialFunction.scala:25) > at > org.apache.flink.runtime.ActorLogMessages$$anon$1.apply(ActorLogMessages.scala:44) > at > org.apache.flink.runtime.ActorLogMessages$$anon$1.apply(ActorLogMessages.scala:30) > at > scala.PartialFunction$class.applyOrElse(PartialFunction.scala:118) > at > org.apache.flink.runtime.ActorLogMessages$$anon$1.applyOrElse(ActorLogMessages.scala:30) > at akka.actor.Actor$class.aroundReceive(Actor.scala:465) > at > org.apache.flink.runtime.taskmanager.TaskManager.aroundReceive(TaskManager.scala:89) > at akka.actor.ActorCell.receiveMessage(ActorCell.scala:516) > at akka.actor.ActorCell.invoke(ActorCell.scala:487) > at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:254) > at akka.dispatch.Mailbox.run(Mailbox.scala:221) > at akka.dispatch.Mailbox.exec(Mailbox.scala:231) > 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.IllegalArgumentException: Union buffer reader > must be initialized with at least two individual buffer readers > at > org.apache.flink.shaded.com.google.common.base.Preconditions.checkArgument(Preconditions.java:125) > at > org.apache.flink.runtime.io.network.api.reader.UnionBufferReader.<init>(UnionBufferReader.java:69) > at > org.apache.flink.streaming.api.streamvertex.CoStreamVertex.setConfigInputs(CoStreamVertex.java:101) > at > org.apache.flink.streaming.api.streamvertex.CoStreamVertex.setInputsOutputs(CoStreamVertex.java:63) > at > org.apache.flink.streaming.api.streamvertex.StreamVertex.registerInputOutput(StreamVertex.java:65) > at > org.apache.flink.runtime.execution.RuntimeEnvironment.<init>(RuntimeEnvironment.java:170) > ... 20 more > {noformat} > > > > -- > This message was sent by Atlassian JIRA > (v6.3.4#6332) >
