[jira] [Created] (BEAM-2114) KafkaIO broken with CoderException

["Devon Meunier (JIRA)" <ji...@apache.org>]

Devon Meunier created BEAM-2114:
-----------------------------------

             Summary: KafkaIO broken with CoderException
                 Key: BEAM-2114
                 URL: https://issues.apache.org/jira/browse/BEAM-2114
             Project: Beam
          Issue Type: Bug
          Components: runner-dataflow, sdk-java-core
            Reporter: Devon Meunier
            Assignee: Daniel Halperin


For a KafkaIO.Read<String, String> I simply replaced {{withKeyCoder}} and {{withValueCoder}} with {{withKeyDeserializer}} and {{withValueDeserializer}} using `StringDeserializer.class` on dataflow and I receive the following traceback:

{code}
java.lang.reflect.InvocationTargetException
	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.codehaus.mojo.exec.ExecJavaMojo$1.run(ExecJavaMojo.java:293)
	at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.RuntimeException: org.apache.beam.sdk.coders.CoderException: cannot encode a null String
	at org.apache.beam.runners.direct.ImmutabilityCheckingBundleFactory$ImmutabilityEnforcingBundle.add(ImmutabilityCheckingBundleFactory.java:115)
	at org.apache.beam.runners.direct.UnboundedReadEvaluatorFactory$UnboundedReadEvaluator.processElement(UnboundedReadEvaluatorFactory.java:136)
	at org.apache.beam.runners.direct.TransformExecutor.processElements(TransformExecutor.java:139)
	at org.apache.beam.runners.direct.TransformExecutor.run(TransformExecutor.java:107)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	... 1 more
Caused by: org.apache.beam.sdk.coders.CoderException: cannot encode a null String
	at org.apache.beam.sdk.coders.StringUtf8Coder.encode(StringUtf8Coder.java:75)
	at org.apache.beam.sdk.coders.StringUtf8Coder.encode(StringUtf8Coder.java:41)
	at org.apache.beam.sdk.coders.KvCoder.encode(KvCoder.java:88)
	at org.apache.beam.sdk.io.kafka.KafkaRecordCoder.encode(KafkaRecordCoder.java:60)
	at org.apache.beam.sdk.io.kafka.KafkaRecordCoder.encode(KafkaRecordCoder.java:36)
	at org.apache.beam.sdk.util.CoderUtils.encodeToSafeStream(CoderUtils.java:122)
	at org.apache.beam.sdk.util.CoderUtils.encodeToByteArray(CoderUtils.java:106)
	at org.apache.beam.sdk.util.CoderUtils.encodeToByteArray(CoderUtils.java:91)
	at org.apache.beam.sdk.util.MutationDetectors$CodedValueMutationDetector.<init>(MutationDetectors.java:106)
	at org.apache.beam.sdk.util.MutationDetectors.forValueWithCoder(MutationDetectors.java:44)
	at org.apache.beam.runners.direct.ImmutabilityCheckingBundleFactory$ImmutabilityEnforcingBundle.add(ImmutabilityCheckingBundleFactory.java:113)
	... 8 more
{code}

attempting to use {{readWithCoders(StringUtf8Coder.of(), StringUtf8Coder.of())}} instead yields:

{code}
java.lang.reflect.InvocationTargetException
	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.codehaus.mojo.exec.ExecJavaMojo$1.run(ExecJavaMojo.java:293)
	at java.lang.Thread.run(Thread.java:745)
Caused by: org.apache.beam.sdk.transforms.display.DisplayData$InternalBuilder$PopulateDisplayDataException: Error while populating display data for component: org.apache.beam.sdk.io.kafka.KafkaIO$TypedWithoutMetadata
	at org.apache.beam.sdk.transforms.display.DisplayData$InternalBuilder.include(DisplayData.java:801)
	at org.apache.beam.sdk.transforms.display.DisplayData$InternalBuilder.access$100(DisplayData.java:733)
	at org.apache.beam.sdk.transforms.display.DisplayData.from(DisplayData.java:81)
	at org.apache.beam.runners.direct.DisplayDataValidator.evaluateDisplayData(DisplayDataValidator.java:47)
	at org.apache.beam.runners.direct.DisplayDataValidator.access$100(DisplayDataValidator.java:29)
	at org.apache.beam.runners.direct.DisplayDataValidator$Visitor.enterCompositeTransform(DisplayDataValidator.java:56)
	at org.apache.beam.sdk.runners.TransformHierarchy$Node.visit(TransformHierarchy.java:479)
	at org.apache.beam.sdk.runners.TransformHierarchy$Node.visit(TransformHierarchy.java:483)
	at org.apache.beam.sdk.runners.TransformHierarchy$Node.access$400(TransformHierarchy.java:232)
	at org.apache.beam.sdk.runners.TransformHierarchy.visit(TransformHierarchy.java:207)
	at org.apache.beam.sdk.Pipeline.traverseTopologically(Pipeline.java:384)
	at org.apache.beam.runners.direct.DisplayDataValidator.validateTransforms(DisplayDataValidator.java:43)
	at org.apache.beam.runners.direct.DisplayDataValidator.validatePipeline(DisplayDataValidator.java:35)
	at org.apache.beam.runners.direct.DirectRunner.run(DirectRunner.java:265)
	at org.apache.beam.runners.direct.DirectRunner.run(DirectRunner.java:63)
	at org.apache.beam.sdk.Pipeline.run(Pipeline.java:277)
	at com.shopify.attribution.pipelines.StoreSessions.main(StoreSessions.java:75)
	... 6 more
Caused by: java.lang.RuntimeException: Unknown value type: StringUtf8Coder
	at org.apache.beam.sdk.transforms.display.DisplayData.item(DisplayData.java:886)
	at org.apache.beam.sdk.io.kafka.KafkaIO$Read.populateDisplayData(KafkaIO.java:750)
	at org.apache.beam.sdk.io.kafka.KafkaIO$TypedWithoutMetadata.populateDisplayData(KafkaIO.java:785)
	at org.apache.beam.sdk.transforms.display.DisplayData$InternalBuilder.include(DisplayData.java:794)
	... 22 more
{code}



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