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Date: Fri, 20 Feb 2015 16:50:41 +0100
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 <CAEXqXcY5pxhz3mDMkr7WW2SjSOfecd2sdYQS5kgFeUYOpYKONA@mail.gmail.com>
Subject: Re: [jira] [Created] (FLINK-1594) DataStreams don't support self-join
From: Alexander Alexandrov <alexander.s.alexandrov@gmail.com>
To: dev@flink.apache.org
Cc: dev@flink.incubator.apache.org
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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) <jira@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}
>
>
>
> --
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