You are viewing a plain text version of this content. The canonical link for it is here.
Posted to issues@beam.apache.org by "Beam JIRA Bot (Jira)" <ji...@apache.org> on 2020/09/01 17:07:04 UTC
[jira] [Updated] (BEAM-4301) NullPointerException with ValueState
of custom class
[ https://issues.apache.org/jira/browse/BEAM-4301?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Beam JIRA Bot updated BEAM-4301:
--------------------------------
Priority: P3 (was: P2)
> NullPointerException with ValueState of custom class
> ----------------------------------------------------
>
> Key: BEAM-4301
> URL: https://issues.apache.org/jira/browse/BEAM-4301
> Project: Beam
> Issue Type: Bug
> Components: sdk-java-core
> Affects Versions: 2.4.0
> Reporter: Xiu Shi
> Priority: P3
> Labels: stale-P2
>
> This is an issue introduced by Beam version 2.4.0, which breaks my current implementation of stateful processing during unit test with direct runner.
> I'm write a DoFn that has a `ValueState` of a custom class which acts as caching. In short, the first item will run through the DoFn just fine, then NullPointerException will be thrown before the second item reaches the DoFn. If I switch to `ValueState` of a string, then everything works fine.
> A simplified version of the DoFn looks like the following:
> {code:java}
> public class GetPredictionsFn
> extends DoFn<KV<List<String>, String>, KV<String, ArrayList<String>>> {
> @StateId("cache")
> private final StateSpec<ValueState<PredictionResponseDto>> cache =
> StateSpecs.value(AvroCoder.of(PredictionResponseDto.class));
> ...
> @ProcessElement
> public void processElement(ProcessContext c,
> @StateId("cache") ValueState<PredictionResponseDto> cache
> )
> throws IOException {
> Gson gson = new Gson();
> System.out.println("here");
> List<String> contentIds = c.element().getKey();
> String sessionId = c.element().getValue();
> System.out.println(sessionId);
> ArrayList<String> strItems = null;
>
> try {
> PredictionResponseDto parsedResponse = cache.read();
> // strItems = parsedResponse.getStrItems();
> if (parsedResponse == null) {
> throw new RuntimeException();
> }
> System.out.println("read");
> System.out.println(gson.toJson(parsedResponse));
> }
> catch (Exception e) {
> String jsonStr = "{\"predictions\":[{\"output\":[19]}],\"strItems\":[\"1.9\"],\"timestamp\":1526485646091}";
> PredictionResponseDto parsedResponse = PredictionResponseDto.parseJson(jsonStr);
> strItems = parsedResponse.getStrItems();
> System.out.println("write");
> System.out.println(gson.toJson(parsedResponse));
> System.out.println(gson.toJson(strItems));
> cache.write(parsedResponse);
> PredictionResponseDto parsedResponse1 = cache.read();
> System.out.println(gson.toJson(parsedResponse1));
> }
>
> KV<String, ArrayList<String>> predictionKv = KV.of(sessionId, strItems);
> System.out.println(gson.toJson(predictionKv));
> c.output(predictionKv);
> }
> }
> {code}
> And the test pipeline looks like the following:
> {code:java}
> // Create a test pipeline.
> Pipeline p = Pipeline.create();
> // Create timestamps
> // currentTime need to be set to the past, otherwise the first window will not be set to
> // currentTime + expiry, but creation time of the pipeline + expiry.
> Instant currentTime = new Instant(0L);
> Instant onTime = currentTime
> .plus(Duration.standardSeconds(streamingOptions.getCacheExpiry()))
> .minus(Duration.standardSeconds(1));
> Instant lateTime = currentTime
> .plus(Duration.standardSeconds(streamingOptions.getCacheExpiry()))
> .plus(Duration.standardSeconds(1));
> // Create stream input.
> TestStream<KV<List<String>, String>> events =
> TestStream.create(KvCoder.of(ListCoder.of(
> StringUtf8Coder.of()), StringUtf8Coder.of()))
> // set the next timestamp to be currentTime
> .advanceWatermarkTo(currentTime)
> .addElements(KV.of(Arrays.asList("1"), "1"))
> .advanceWatermarkTo(onTime)
> .addElements(KV.of(Arrays.asList("1"), "2"))
> .addElements(KV.of(Arrays.asList("1"), "3"))
> .advanceWatermarkTo(lateTime)
> .addElements(KV.of(Arrays.asList("1"), "4"))
> .advanceWatermarkToInfinity();
> PCollection<KV<String, ArrayList<String>>> output =
> p.apply(events).apply(Window.into(FixedWindows.of(
> Duration.standardSeconds(streamingOptions.getCacheExpiry()))))
> .apply(ParDo.of(doFn));
> PAssert.that(output).containsInAnyOrder(expect);
> {code}
> The Trace looks like:
> {code:java}
> org.apache.beam.sdk.Pipeline$PipelineExecutionException: java.lang.NullPointerException: in ca.cbc.recsysdataflow.PredictionResponseDto in array in ca.cbc.recsysdataflow.PredictionResponseDto$.Prediction in array null of array in field key of ca.cbc.recsysdataflow.PredictionResponseDto$.Prediction of array in field predictions of ca.cbc.recsysdataflow.PredictionResponseDto
> at org.apache.beam.runners.direct.DirectRunner$DirectPipelineResult.waitUntilFinish(DirectRunner.java:342)
> at org.apache.beam.runners.direct.DirectRunner$DirectPipelineResult.waitUntilFinish(DirectRunner.java:312)
> at org.apache.beam.runners.direct.DirectRunner.run(DirectRunner.java:206)
> at org.apache.beam.runners.direct.DirectRunner.run(DirectRunner.java:62)
> at org.apache.beam.sdk.Pipeline.run(Pipeline.java:311)
> at org.apache.beam.sdk.Pipeline.run(Pipeline.java:297)
> at ca.cbc.recsysdataflow.test.transforms.streaming.GetPredictionsCacheTest.testCache(GetPredictionsCacheTest.java:156)
> 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.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$2.evaluate(ParentRunner.java:268)
> at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
> at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
> at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86)
> at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
> at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:538)
> at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:760)
> at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:460)
> at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:206)
> Caused by: java.lang.NullPointerException: in ca.cbc.recsysdataflow.PredictionResponseDto in array in ca.cbc.recsysdataflow.PredictionResponseDto$.Prediction in array null of array in field key of ca.cbc.recsysdataflow.PredictionResponseDto$.Prediction of array in field predictions of ca.cbc.recsysdataflow.PredictionResponseDto
> at org.apache.avro.reflect.ReflectDatumWriter.write(ReflectDatumWriter.java:161)
> at org.apache.avro.generic.GenericDatumWriter.write(GenericDatumWriter.java:62)
> at org.apache.beam.sdk.coders.AvroCoder.encode(AvroCoder.java:308)
> at org.apache.beam.sdk.coders.Coder.encode(Coder.java:143)
> at org.apache.beam.sdk.util.CoderUtils.encodeToSafeStream(CoderUtils.java:85)
> at org.apache.beam.sdk.util.CoderUtils.encodeToByteArray(CoderUtils.java:69)
> at org.apache.beam.sdk.util.CoderUtils.encodeToByteArray(CoderUtils.java:54)
> at org.apache.beam.sdk.util.CoderUtils.clone(CoderUtils.java:148)
> at org.apache.beam.runners.direct.repackaged.runners.core.InMemoryStateInternals.uncheckedClone(InMemoryStateInternals.java:648)
> at org.apache.beam.runners.direct.repackaged.runners.core.InMemoryStateInternals.access$000(InMemoryStateInternals.java:62)
> at org.apache.beam.runners.direct.repackaged.runners.core.InMemoryStateInternals$InMemoryValue.copy(InMemoryStateInternals.java:221)
> at org.apache.beam.runners.direct.repackaged.runners.core.InMemoryStateInternals$InMemoryValue.copy(InMemoryStateInternals.java:181)
> at org.apache.beam.runners.direct.CopyOnAccessInMemoryStateInternals$CopyOnAccessInMemoryStateTable$CopyOnBindBinderFactory$1.bindValue(CopyOnAccessInMemoryStateInternals.java:301)
> at org.apache.beam.runners.direct.repackaged.runners.core.StateTags$2.bindValue(StateTags.java:71)
> at org.apache.beam.sdk.state.StateSpecs$ValueStateSpec.bind(StateSpecs.java:278)
> at org.apache.beam.sdk.state.StateSpecs$ValueStateSpec.bind(StateSpecs.java:267)
> at org.apache.beam.runners.direct.repackaged.runners.core.StateTags$SimpleStateTag.bind(StateTags.java:324)
> at org.apache.beam.runners.direct.repackaged.runners.core.StateTable.get(StateTable.java:60)
> at org.apache.beam.runners.direct.CopyOnAccessInMemoryStateInternals.state(CopyOnAccessInMemoryStateInternals.java:127)
> at org.apache.beam.runners.direct.CopyOnAccessInMemoryStateInternals.state(CopyOnAccessInMemoryStateInternals.java:121)
> at org.apache.beam.runners.direct.repackaged.runners.core.SimpleDoFnRunner$DoFnProcessContext.state(SimpleDoFnRunner.java:518)
> at ca.cbc.recsysdataflow.transforms.streaming.GetPredictionsFn$DoFnInvoker.invokeProcessElement(Unknown Source)
> Caused by: java.lang.NullPointerException
> at org.apache.avro.reflect.ReflectDatumWriter.writeArray(ReflectDatumWriter.java:71)
> at org.apache.avro.generic.GenericDatumWriter.writeWithoutConversion(GenericDatumWriter.java:120)
> at org.apache.avro.generic.GenericDatumWriter.write(GenericDatumWriter.java:75)
> at org.apache.avro.reflect.ReflectDatumWriter.write(ReflectDatumWriter.java:159)
> at org.apache.avro.generic.GenericDatumWriter.writeField(GenericDatumWriter.java:166)
> at org.apache.avro.specific.SpecificDatumWriter.writeField(SpecificDatumWriter.java:90)
> at org.apache.avro.reflect.ReflectDatumWriter.writeField(ReflectDatumWriter.java:191)
> at org.apache.avro.generic.GenericDatumWriter.writeRecord(GenericDatumWriter.java:156)
> at org.apache.avro.generic.GenericDatumWriter.writeWithoutConversion(GenericDatumWriter.java:118)
> at org.apache.avro.generic.GenericDatumWriter.write(GenericDatumWriter.java:75)
> at org.apache.avro.reflect.ReflectDatumWriter.write(ReflectDatumWriter.java:159)
> at org.apache.avro.generic.GenericDatumWriter.writeArray(GenericDatumWriter.java:192)
> at org.apache.avro.reflect.ReflectDatumWriter.writeArray(ReflectDatumWriter.java:68)
> at org.apache.avro.generic.GenericDatumWriter.writeWithoutConversion(GenericDatumWriter.java:120)
> at org.apache.avro.generic.GenericDatumWriter.write(GenericDatumWriter.java:75)
> at org.apache.avro.reflect.ReflectDatumWriter.write(ReflectDatumWriter.java:159)
> at org.apache.avro.generic.GenericDatumWriter.writeField(GenericDatumWriter.java:166)
> at org.apache.avro.specific.SpecificDatumWriter.writeField(SpecificDatumWriter.java:90)
> at org.apache.avro.reflect.ReflectDatumWriter.writeField(ReflectDatumWriter.java:191)
> at org.apache.avro.generic.GenericDatumWriter.writeRecord(GenericDatumWriter.java:156)
> at org.apache.avro.generic.GenericDatumWriter.writeWithoutConversion(GenericDatumWriter.java:118)
> at org.apache.avro.generic.GenericDatumWriter.write(GenericDatumWriter.java:75)
> at org.apache.avro.reflect.ReflectDatumWriter.write(ReflectDatumWriter.java:159)
> at org.apache.avro.generic.GenericDatumWriter.write(GenericDatumWriter.java:62)
> at org.apache.beam.sdk.coders.AvroCoder.encode(AvroCoder.java:308)
> at org.apache.beam.sdk.coders.Coder.encode(Coder.java:143)
> at org.apache.beam.sdk.util.CoderUtils.encodeToSafeStream(CoderUtils.java:85)
> at org.apache.beam.sdk.util.CoderUtils.encodeToByteArray(CoderUtils.java:69)
> at org.apache.beam.sdk.util.CoderUtils.encodeToByteArray(CoderUtils.java:54)
> at org.apache.beam.sdk.util.CoderUtils.clone(CoderUtils.java:148)
> at org.apache.beam.runners.direct.repackaged.runners.core.InMemoryStateInternals.uncheckedClone(InMemoryStateInternals.java:648)
> at org.apache.beam.runners.direct.repackaged.runners.core.InMemoryStateInternals.access$000(InMemoryStateInternals.java:62)
> at org.apache.beam.runners.direct.repackaged.runners.core.InMemoryStateInternals$InMemoryValue.copy(InMemoryStateInternals.java:221)
> at org.apache.beam.runners.direct.repackaged.runners.core.InMemoryStateInternals$InMemoryValue.copy(InMemoryStateInternals.java:181)
> at org.apache.beam.runners.direct.CopyOnAccessInMemoryStateInternals$CopyOnAccessInMemoryStateTable$CopyOnBindBinderFactory$1.bindValue(CopyOnAccessInMemoryStateInternals.java:301)
> at org.apache.beam.runners.direct.repackaged.runners.core.StateTags$2.bindValue(StateTags.java:71)
> at org.apache.beam.sdk.state.StateSpecs$ValueStateSpec.bind(StateSpecs.java:278)
> at org.apache.beam.sdk.state.StateSpecs$ValueStateSpec.bind(StateSpecs.java:267)
> at org.apache.beam.runners.direct.repackaged.runners.core.StateTags$SimpleStateTag.bind(StateTags.java:324)
> at org.apache.beam.runners.direct.repackaged.runners.core.StateTable.get(StateTable.java:60)
> at org.apache.beam.runners.direct.CopyOnAccessInMemoryStateInternals.state(CopyOnAccessInMemoryStateInternals.java:127)
> at org.apache.beam.runners.direct.CopyOnAccessInMemoryStateInternals.state(CopyOnAccessInMemoryStateInternals.java:121)
> at org.apache.beam.runners.direct.repackaged.runners.core.SimpleDoFnRunner$DoFnProcessContext.state(SimpleDoFnRunner.java:518)
> at ca.cbc.recsysdataflow.transforms.streaming.GetPredictionsFn$DoFnInvoker.invokeProcessElement(Unknown Source)
> at org.apache.beam.runners.direct.repackaged.runners.core.SimpleDoFnRunner.invokeProcessElement(SimpleDoFnRunner.java:177)
> at org.apache.beam.runners.direct.repackaged.runners.core.SimpleDoFnRunner.processElement(SimpleDoFnRunner.java:138)
> at org.apache.beam.runners.direct.repackaged.runners.core.SimplePushbackSideInputDoFnRunner.processElementInReadyWindows(SimplePushbackSideInputDoFnRunner.java:72)
> at org.apache.beam.runners.direct.ParDoEvaluator.processElement(ParDoEvaluator.java:179)
> at org.apache.beam.runners.direct.DoFnLifecycleManagerRemovingTransformEvaluator.processElement(DoFnLifecycleManagerRemovingTransformEvaluator.java:51)
> at org.apache.beam.runners.direct.StatefulParDoEvaluatorFactory$StatefulParDoEvaluator.processElement(StatefulParDoEvaluatorFactory.java:245)
> at org.apache.beam.runners.direct.DirectTransformExecutor.processElements(DirectTransformExecutor.java:161)
> at org.apache.beam.runners.direct.DirectTransformExecutor.run(DirectTransformExecutor.java:125)
> at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
> at java.util.concurrent.FutureTask.run(FutureTask.java:266)
> at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
> at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
> at java.lang.Thread.run(Thread.java:748)
> {code}
--
This message was sent by Atlassian Jira
(v8.3.4#803005)