gaoran10 edited a comment on issue #7407: URL: https://github.com/apache/pulsar/issues/7407#issuecomment-698094497
@fmiguelez Sorry, late response. 1. `producer.newMessage().key("1").send()` Currently, if we send messages as above the message payload is `ByteBuffer.allocate(0)`, thus if the topic with Avro schema, the decoder can't decode an empty byte array, this will cause java.io.EOFException as below. ``` org.apache.pulsar.client.api.SchemaSerializationException: java.io.EOFException at org.apache.pulsar.client.impl.schema.reader.AvroReader.read(AvroReader.java:77) at org.apache.pulsar.client.api.schema.SchemaReader.read(SchemaReader.java:36) at org.apache.pulsar.client.impl.schema.StructSchema.decode(StructSchema.java:107) at org.apache.pulsar.client.impl.MessageImpl.getValue(MessageImpl.java:301) at org.apache.pulsar.broker.transaction.TransactionProduceTest.test(TransactionProduceTest.java:639) 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.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:124) at org.testng.internal.Invoker.invokeMethod(Invoker.java:583) at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:719) at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:989) at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:125) at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:109) at org.testng.TestRunner.privateRun(TestRunner.java:648) at org.testng.TestRunner.run(TestRunner.java:505) at org.testng.SuiteRunner.runTest(SuiteRunner.java:455) at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:450) at org.testng.SuiteRunner.privateRun(SuiteRunner.java:415) at org.testng.SuiteRunner.run(SuiteRunner.java:364) at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52) at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:84) at org.testng.TestNG.runSuitesSequentially(TestNG.java:1208) at org.testng.TestNG.runSuitesLocally(TestNG.java:1137) at org.testng.TestNG.runSuites(TestNG.java:1049) at org.testng.TestNG.run(TestNG.java:1017) at com.intellij.rt.testng.IDEARemoteTestNG.run(IDEARemoteTestNG.java:66) at com.intellij.rt.testng.RemoteTestNGStarter.main(RemoteTestNGStarter.java:110) Caused by: java.io.EOFException at org.apache.avro.io.BinaryDecoder.ensureBounds(BinaryDecoder.java:509) at org.apache.avro.io.BinaryDecoder.readInt(BinaryDecoder.java:149) at org.apache.avro.io.BinaryDecoder.readIndex(BinaryDecoder.java:460) at org.apache.avro.io.ResolvingDecoder.readIndex(ResolvingDecoder.java:282) at org.apache.avro.generic.GenericDatumReader.readWithoutConversion(GenericDatumReader.java:178) at org.apache.avro.reflect.ReflectDatumReader.readField(ReflectDatumReader.java:290) at org.apache.avro.generic.GenericDatumReader.readRecord(GenericDatumReader.java:237) at org.apache.avro.specific.SpecificDatumReader.readRecord(SpecificDatumReader.java:123) at org.apache.avro.generic.GenericDatumReader.readWithoutConversion(GenericDatumReader.java:170) at org.apache.avro.generic.GenericDatumReader.read(GenericDatumReader.java:151) at org.apache.avro.generic.GenericDatumReader.read(GenericDatumReader.java:144) at org.apache.pulsar.client.impl.schema.reader.AvroReader.read(AvroReader.java:75) ... 28 more ``` 2. `producer.newMessage().key("1").value(null).send()` If we specify the value is null, the messageMetaData will record the flag `msgMetadataBuilder.setNullValue(true)`, the consumer client will check the nullValue flag before schema decoder decode the payload, if the flag is true will return null value directly. 3. Currently, the message value has three forms, normal value, empty byte array, and null value, if topics use the Avro schema consumer couldn't handle the empty byte array payload, maybe the consumer should return a null value for the empty byte array. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org