kennknowles opened a new issue, #18894:
URL: https://github.com/apache/beam/issues/18894
When trying a Go pipeline with a 2-output DoFn on the hacking branch, I see:
```
[flink-runner-job-server] ERROR
org.apache.beam.runners.flink.FlinkJobInvocation - Error during job
invocation go-job-1521582585657843000_-2121541089_763230090.
java.lang.RuntimeException: Pipeline
execution failed
at org.apache.beam.runners.flink.FlinkRunner.run(FlinkRunner.java:134)
at
org.apache.beam.runners.flink.FlinkJobInvocation.lambda$start$0(FlinkJobInvocation.java:61)
at
org.apache.beam.util.concurrent.TrustedListenableFutureTask$TrustedFutureInterruptibleTask.runInterruptibly(TrustedListenableFutureTask.java:111)
at
org.apache.beam.util.concurrent.InterruptibleTask.run(InterruptibleTask.java:58)
at
org.apache.beam.util.concurrent.TrustedListenableFutureTask.run(TrustedListenableFutureTask.java:75)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
Caused by: 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.RuntimeException:
java.util.concurrent.ExecutionException: java.lang.IllegalArgumentException:
expected one element but was: <0, 1>
at
org.apache.beam.runners.flink.translation.functions.FlinkExecutableStageFunction.lambda$mapPartition$0(FlinkExecutableStageFunction.java:176)
at java.util.HashMap$Values.forEach(HashMap.java:980)
at
org.apache.beam.runners.flink.translation.functions.FlinkExecutableStageFunction.mapPartition(FlinkExecutableStageFunction.java:172)
at
org.apache.flink.runtime.operators.MapPartitionDriver.run(MapPartitionDriver.java:103)
at org.apache.flink.runtime.operators.BatchTask.run(BatchTask.java:490)
at org.apache.flink.runtime.operators.BatchTask.invoke(BatchTask.java:355)
at org.apache.flink.runtime.taskmanager.Task.run(Task.java:718)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.util.concurrent.ExecutionException:
java.lang.IllegalArgumentException:
expected one element but was: <0, 1>
at
org.apache.beam.util.concurrent.AbstractFuture.getDoneValue(AbstractFuture.java:500)
at
org.apache.beam.util.concurrent.AbstractFuture.get(AbstractFuture.java:479)
at
org.apache.beam.util.concurrent.AbstractFuture$TrustedFuture.get(AbstractFuture.java:76)
at
org.apache.beam.sdk.fn.data.SettableFutureInboundDataClient.awaitCompletion(SettableFutureInboundDataClient.java:41)
at
org.apache.beam.sdk.fn.data.BeamFnDataInboundObserver.awaitCompletion(BeamFnDataInboundObserver.java:89)
at
org.apache.beam.runners.flink.translation.functions.FlinkExecutableStageFunction.lambda$mapPartition$0(FlinkExecutableStageFunction.java:174)
... 7 more
Caused by: java.lang.IllegalArgumentException: expected one element but
was: <0, 1>
at
org.apache.beam.collect.Iterators.getOnlyElement(Iterators.java:322)
at org.apache.beam.collect.Iterables.getOnlyElement(Iterables.java:294)
at
org.apache.beam.runners.flink.translation.functions.FlinkExecutableStageFunction$1$1.accept(FlinkExecutableStageFunction.java:149)
at
org.apache.beam.runners.flink.translation.functions.FlinkExecutableStageFunction$1$1.accept(FlinkExecutableStageFunction.java:135)
at
org.apache.beam.sdk.fn.data.BeamFnDataInboundObserver.accept(BeamFnDataInboundObserver.java:80)
at
org.apache.beam.sdk.fn.data.BeamFnDataInboundObserver.accept(BeamFnDataInboundObserver.java:32)
at
org.apache.beam.sdk.fn.data.BeamFnDataGrpcMultiplexer$InboundObserver.onNext(BeamFnDataGrpcMultiplexer.java:135)
at
org.apache.beam.sdk.fn.data.BeamFnDataGrpcMultiplexer$InboundObserver.onNext(BeamFnDataGrpcMultiplexer.java:123)
at io.grpc.stub.ServerCalls$2$1.onMessage(ServerCalls.java:204)
at
io.grpc.internal.ServerCallImpl$ServerStreamListenerImpl.messageRead(ServerCallImpl.java:242)
at
io.grpc.internal.ServerImpl$JumpToApplicationThreadServerStreamListener$1.runInContext(ServerImpl.java:568)
at io.grpc.internal.ContextRunnable.run(ContextRunnable.java:52)
at
io.grpc.internal.SerializingExecutor$TaskRunner.run(SerializingExecutor.java:152)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.co
```
Imported from Jira
[BEAM-3897](https://issues.apache.org/jira/browse/BEAM-3897). Original Jira may
contain additional context.
Reported by: herohde.
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