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https://issues.apache.org/jira/browse/BEAM-6086?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Kenneth Knowles reassigned BEAM-6086:
-------------------------------------
Assignee: (was: Kenneth Knowles)
> Flaky tests when using PCollectionView with View.asSingleton()
> --------------------------------------------------------------
>
> Key: BEAM-6086
> URL: https://issues.apache.org/jira/browse/BEAM-6086
> Project: Beam
> Issue Type: Bug
> Components: runner-direct
> Reporter: Evgeny
> Priority: Critical
>
> Here is the minimal project that demonstrates the issue
> https://github.com/medvedev1088/dataflow-flaky-tests. About 1 time out of 10
> the tests fail with
> org.apache.beam.sdk.Pipeline$PipelineExecutionException:
> java.lang.IllegalArgumentException: Empty PCollection accessed as a singleton
> view. Consider setting withDefault to provide a default value
> at
> org.apache.beam.runners.direct.DirectRunner$DirectPipelineResult.waitUntilFinish(DirectRunner.java:332)
> at
> org.apache.beam.runners.direct.DirectRunner$DirectPipelineResult.waitUntilFinish(DirectRunner.java:302)
> at
> org.apache.beam.runners.direct.DirectRunner.run(DirectRunner.java:197)
> at org.apache.beam.runners.direct.DirectRunner.run(DirectRunner.java:64)
> at org.apache.beam.sdk.Pipeline.run(Pipeline.java:313)
> at org.apache.beam.sdk.testing.TestPipeline.run(TestPipeline.java:350)
> at org.apache.beam.sdk.testing.TestPipeline.run(TestPipeline.java:331)
> at
> com.beam.MyPipelineTest.testTokenTransfersBasic(MyPipelineTest.java:29)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:498)
> at
> org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
> at
> org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
> at
> org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
> at
> org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
> at
> org.apache.beam.sdk.testing.TestPipeline$1.evaluate(TestPipeline.java:319)
> at org.junit.rules.RunRules.evaluate(RunRules.java:20)
> at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
> at
> org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
> at
> org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
> at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
> at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
> at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
> at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
> at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
> at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
> at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
> at
> com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
> at
> com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
> at
> com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
> at
> com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)
> Caused by: java.lang.IllegalArgumentException: Empty PCollection accessed as
> a singleton view. Consider setting withDefault to provide a default value
> at
> org.apache.beam.sdk.transforms.View$SingletonCombineFn.identity(View.java:378)
> at
> org.apache.beam.sdk.transforms.Combine$BinaryCombineFn.extractOutput(Combine.java:436)
> at
> org.apache.beam.sdk.transforms.Combine$BinaryCombineFn.extractOutput(Combine.java:384)
> at
> org.apache.beam.sdk.transforms.Combine$CombineFn.apply(Combine.java:353)
> at
> org.apache.beam.sdk.transforms.Combine$GroupedValues$1.processElement(Combine.java:2056)
> Related to https://jira.apache.org/jira/browse/BEAM-6036
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