如何使用Avro和Flink解码Kafka消息

Question

I am trying to read AVRO data from a Kafka topic using Flink 1.0.3.

I just know that this particular Kafka topic is having AVRO encoded message and I am having the AVRO schema file.

My Flink code:

public static void main(String[] args) throws Exception {
        StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
        Properties properties = new Properties();
        properties.setProperty("bootstrap.servers", "dojo3xxxxx:9092,dojoxxxxx:9092,dojoxxxxx:9092");
        properties.setProperty("zookeeper.connect", "dojo3xxxxx:2181,dojoxxxxx:2181,dojoxxxxx:2181");
        properties.setProperty("group.id", "Zeeshantest");
        AvroDeserializationSchema<Event> avroSchema = new AvroDeserializationSchema<>(Event.class);
        FlinkKafkaConsumer08<Event> kafkaConsumer = new FlinkKafkaConsumer08<>("myavrotopic", avroSchema, properties);
        DataStream<Event> messageStream = env.addSource(kafkaConsumer);
        messageStream.rebalance().print();
        env.execute("Flink AVRO KAFKA Test");
    }

I have created my Event.java file using the avro tools and schema "rocana.avsc"

java -jar /path/to/avro-tools-1.8.1.jar compile schema rocana.avsc

Here is rocana.avsc file uploaded in github.

AvroDeserializationSchema.java

import org.apache.avro.io.BinaryDecoder;
import org.apache.avro.io.DatumReader;
import org.apache.avro.io.DecoderFactory;
import org.apache.avro.reflect.ReflectDatumReader;
import org.apache.avro.specific.SpecificDatumReader;
import org.apache.flink.api.common.typeinfo.TypeInformation;
import org.apache.flink.api.java.typeutils.TypeExtractor;
import org.apache.flink.streaming.util.serialization.DeserializationSchema;

public class AvroDeserializationSchema<T> implements DeserializationSchema<T> {

    private static final long serialVersionUID = 4330538776656642778L;

    private final Class<T> avroType;
    private transient DatumReader<T> reader;
    private transient BinaryDecoder decoder;

    public AvroDeserializationSchema(Class<T> avroType) {
        this.avroType = avroType;
    }

    @Override
    public T deserialize(byte[] message) {
        ensureInitialized();
        try {
            decoder = DecoderFactory.get().binaryDecoder(message, decoder);
            return reader.read(null, decoder);
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    @Override
    public boolean isEndOfStream(T nextElement) {
        return false;
    }

    @Override
    public TypeInformation<T> getProducedType() {
        return TypeExtractor.getForClass(avroType);
    }

    private void ensureInitialized() {
        if (reader == null) {
            if (org.apache.avro.specific.SpecificRecordBase.class.isAssignableFrom(avroType)) {
                reader = new SpecificDatumReader<T>(avroType);
            } else {
                reader = new ReflectDatumReader<T>(avroType);
            }
        }
    }
}

On running my program I am getting the following error:

17:25:30,759 INFO  org.apache.zookeeper.ZooKeeper                                - Session: 0x356350cb9001857 closed
17:25:30,759 INFO  org.apache.zookeeper.ClientCnxn                               - EventThread shut down
17:25:30,761 INFO  org.apache.flink.runtime.taskmanager.Task                     - Source: Custom Source (3/4) switched to FAILED with exception.
java.lang.Exception: 2
    at org.apache.flink.streaming.connectors.kafka.internals.LegacyFetcher.run(LegacyFetcher.java:222)
    at org.apache.flink.streaming.connectors.kafka.FlinkKafkaConsumer08.run(FlinkKafkaConsumer08.java:316)
    at org.apache.flink.streaming.api.operators.StreamSource.run(StreamSource.java:78)
    at org.apache.flink.streaming.runtime.tasks.SourceStreamTask.run(SourceStreamTask.java:56)
    at org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:225)
    at org.apache.flink.runtime.taskmanager.Task.run(Task.java:559)
    at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.ArrayIndexOutOfBoundsException: 2
    at org.apache.avro.io.parsing.Symbol$Alternative.getSymbol(Symbol.java:402)
    at org.apache.avro.io.ResolvingDecoder.doAction(ResolvingDecoder.java:290)
    at org.apache.avro.io.parsing.Parser.advance(Parser.java:88)
    at org.apache.avro.io.ResolvingDecoder.readIndex(ResolvingDecoder.java:267)
    at org.apache.avro.generic.GenericDatumReader.read(GenericDatumReader.java:155)
    at org.apache.avro.generic.GenericDatumReader.readField(GenericDatumReader.java:193)
    at org.apache.avro.reflect.ReflectDatumReader.readField(ReflectDatumReader.java:230)
    at org.apache.avro.generic.GenericDatumReader.readRecord(GenericDatumReader.java:183)
    at org.apache.avro.generic.GenericDatumReader.read(GenericDatumReader.java:151)
    at org.apache.avro.generic.GenericDatumReader.read(GenericDatumReader.java:142)
    at com.google.cloud.dataflow.sdk.coders.AvroCoder.decode(AvroCoder.java:274)
    at org.fmr.flink.AvroDeserializationSchema.deserialize(AvroDeserializationSchema.java:52)
    at org.apache.flink.streaming.util.serialization.KeyedDeserializationSchemaWrapper.deserialize(KeyedDeserializationSchemaWrapper.java:39)
    at org.apache.flink.streaming.connectors.kafka.internals.LegacyFetcher$SimpleConsumerThread.run(LegacyFetcher.java:657)
17:25:30,769 INFO  org.apache.flink.runtime.taskmanager.Task                     - Freeing task resources for Source: Custom Source (3/4)
17:25:30,776 INFO  org.apache.flink.runtime.taskmanager.Task                     - Sink: Unnamed (1/4) switched

I think my deserialize code is not correct. Do anyone know what I am doing wrong? Is this the way to read AVRO data from Kafka using Flink or there is a better way around?

Answer 1

Try the below code to deserialize the Avro record:

Schema a; //Your Avro schema
DatumReader<GenericData.Record> reader = new GenericDatumReader<GenericData.Record>(a);
GenericData.Record a = reader.read(null, DecoderFactory.get().binaryDecoder(bytes, null));

Answer 2

Whatever code I posted as per my question works perfectly fine.

Issue was with the data sent to kafka topic, both JSON and AVRO formatted data was sent there. I subscribed to a different Kafka topic where data was only in AVRO and my code worked fine.