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https://issues.apache.org/jira/browse/FLINK-25711?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jordan Moore updated FLINK-25711:
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Summary: OOM / buffer-overflow on KafkaIO.read using SpecificRecord (was:
OOM / buffer-overflow on KafkaIO SpecificRecord)
> OOM / buffer-overflow on KafkaIO.read using SpecificRecord
> ----------------------------------------------------------
>
> Key: FLINK-25711
> URL: https://issues.apache.org/jira/browse/FLINK-25711
> Project: Flink
> Issue Type: Bug
> Components: Connectors / Kafka
> Reporter: Jordan Moore
> Priority: Major
>
> *Details* - Trying to use a generated Avro SpecificRecord subclass with
> KafkaIO.read (I was able to use KafkaIO.write fine with it).
> *Problem* - OOM happens while constructing the deserializer with
> SpecificRecord, but not GenericRecord. I am unable to use my generated class
> because I get errors saying it cannot be cast to a GenericRecord (even though
> it extends/implements it though a chain of other classes)
> Small example with Kafka and Confluent Schema Registry locally
> {code}
> public static void main(String[] args) throws Exception {
> PipelineOptions options = PipelineOptionsFactory.fromArgs(args).create();
> // Pipeline p = getWritePipeline(options);
> Pipeline p = Pipeline.create(options);
> final String topic = "foobar-2";
> final SubjectNameStrategy subjectStrategy = new TopicNameStrategy();
> final String valueSubject = subjectStrategy.subjectName(topic, false,
> null); // schema not used
> final ConfluentSchemaRegistryDeserializerProvider<SpecificRecord>
> valueProvider =
>
> ConfluentSchemaRegistryDeserializerProvider.of("http://localhost:8081";,
> valueSubject, null,
> // TODO: This doesn't
> seem to work to get the SpecificRecord subclass in the apply function below
>
> ImmutableMap.of(KafkaAvroDeserializerConfig.SPECIFIC_AVRO_READER_CONFIG,
> true));
> p
> .apply(KafkaIO.<byte[], SpecificRecord>read()
> .withBootstrapServers("localhost:9092")
> .withTopic(topic)
> .withKeyDeserializer(ByteArrayDeserializer.class) // Don't
> have any keys, but this is required
> .withValueDeserializer(valueProvider)
> .withConsumerConfigUpdates(ImmutableMap.of(
> ConsumerConfig.AUTO_OFFSET_RESET_CONFIG,
> OffsetResetStrategy.EARLIEST.name().toLowerCase(Locale.ROOT),
> ConsumerConfig.GROUP_ID_CONFIG, "beam-" +
> UUID.randomUUID()
> ))
> .withoutMetadata()
> ).apply(Values.create())
> // TODO: How to get SpecificRecord subclass?
> .apply(MapElements.via(new SimpleFunction<SpecificRecord, Void>() {
> @Override
> public Void apply(SpecificRecord input) {
> log.info("{}", input);
> return null;
> }
> }));
> p.run().waitUntilFinish();
> }
> {code}
> Avro schema that I am using, which generates a class Product.java that I
> would like to use in-place of SpecificRecord above.
> {code}
> {"type":"record","name":"Product","namespace":"cricket.jmoore.avro","fields":[{"name":"name","type":"string"}]}
> {code}
> *Flink Version*: 2.35.0
> Dependencies:
> {code}
> <dependency>
> <groupId>org.apache.kafka</groupId>
> <artifactId>kafka-clients</artifactId>
> <version>2.8.1</version>
> </dependency>
> <dependency>
> <groupId>io.confluent</groupId>
> <artifactId>kafka-avro-serializer</artifactId>
> <version>7.0.1</version>
> </dependency>
> <dependency>
> <groupId>org.apache.beam</groupId>
> <artifactId>beam-runners-direct-java</artifactId>
> <version>${beam.version}</version> <!-- 2.35.0 -->
> <scope>provided</scope>
> </dependency>
> <dependency>
> <groupId>org.apache.beam</groupId>
> <artifactId>beam-sdks-java-core</artifactId>
> <version>${beam.version}</version>
> </dependency>
> {code}
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