Matthias J. Sax created FLINK-2658:
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Summary: fieldsGrouping for multiple output streams fails
Key: FLINK-2658
URL: https://issues.apache.org/jira/browse/FLINK-2658
Project: Flink
Issue Type: Bug
Components: Storm Compatibility
Reporter: Matthias J. Sax
Assignee: Matthias J. Sax
If a Spout or Bolt declares multiple output streams and another Bolt connects
to one of those streams via "fieldsGrouping", the call to
{{FlinkTopologyBuilder.createTopology()}} fails with the following exception:
{noformat}
org.apache.flink.api.common.InvalidProgramException: Specifying keys via field
positions is only valid for tuple data types. Type:
PojoType<org.apache.flink.stormcompatibility.util.SplitStreamType, fields =
[streamId: String, value: GenericType<java.lang.Object>]>
at
org.apache.flink.api.java.operators.Keys$ExpressionKeys.<init>(Keys.java:209)
at
org.apache.flink.api.java.operators.Keys$ExpressionKeys.<init>(Keys.java:203)
at
org.apache.flink.streaming.api.datastream.DataStream.groupBy(DataStream.java:285)
at
org.apache.flink.stormcompatibility.api.FlinkTopologyBuilder.createTopology(FlinkTopologyBuilder.java:200)
at
org.apache.flink.stormcompatibility.api.FlinkTopologyBuilderTest.testFieldsGroupingOnMultipleBoltOutputStreams(FlinkTopologyBuilderTest.java:73)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at
org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
at
org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at
org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
at
org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271)
at
org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)
at
org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
at
org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
at
org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
{noformat}
Fix: either introduce a mapper, that "flattens" the {{SplitStreamType}} in to
regular tuple type that is nested inside or provide a custom {{KeySelector}}.
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