We have a join operator that is defined over windows in the data stream. So the problem is not with the join itself, but it seems that trying to apply this window-join with itself throws an error.
On Fri, Feb 20, 2015 at 4:50 PM, Alexander Alexandrov < alexander.s.alexand...@gmail.com> wrote: > 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) > > >
