Apache kafka 无法使用kafka avro控制台使用者读取avro消息。SerializationException:未知的魔法字节

我正在编写一个REST代理，就像合流REST代理一样。它接受JSON负载、模式主题和id，然后将JSON负载作为Avro对象写入流中。当我使用kafka avro console consumer阅读消息时，我收到了“未知魔法字节”错误

这是我的卡夫卡制作人配置：

        properties.put("client.id", LocalHostUtils.getLocalHostName(null));

        properties.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, StringSerializer.class);
        properties.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, KafkaAvroSerializer.class);

        properties.put(AbstractKafkaAvroSerDeConfig.AUTO_REGISTER_SCHEMAS, false);
        properties.put(KafkaAvroSerializerConfig.VALUE_SUBJECT_NAME_STRATEGY, RecordNameStrategy.class);

        properties.put("schema.registry.url", configValuesManager.getString("dsp_kafka.schema_registry"));

        if (KafkaUtils.isKafkaEnabled()) {
            this.kafkaProducer = new KafkaProducer<String, Object>(properties);
        }

这是

toAvro

方法的实现：

    Object toAvro(Schema schema, String jsonBody) throws IOException
    {
        DatumReader<Object> reader = new GenericDatumReader<Object>(schema);
        Object object = reader.read(
                null, decoderFactory.jsonDecoder(schema, jsonBody));

        return object;

    }

这是

kafkaSchemaValidatingProducer上的
publish
方法

    public void publish(String topic, Integer partition, String key, Object data)
    {
        log.debug("publish topic={} key={} value={}", topic, key, data);

        if (!KafkaUtils.isKafkaEnabled()) {
            log.warn("Kafka is not enabled....");
            return;
        }

        ProducerRecord<String, Object> record = new ProducerRecord<String, Object>(topic, key, data);


        Future<RecordMetadata> metadataFuture = kafkaProducer.send(record, new Callback()
        {
            @Override
            public void onCompletion(RecordMetadata metadata, Exception exception)
            {
                if (exception == null) {
                    log.info(metadata.toString());
                    return;
                }

                log.error("exception", exception);

            }
        });

        kafkaProducer.flush();

    }


这导致

[2019-08-26 16:30:36,351] ERROR Error processing message, skipping this message:  (kafka.tools.ConsoleConsumer$:76)
org.apache.kafka.common.errors.SerializationException: Error deserializing Avro message for id -1
Caused by: org.apache.kafka.common.errors.SerializationException: Unknown magic byte!

知道我为什么会出现“坏幻数错误”吗
 我解决了这个问题。这是因为我没有在命令中指定密钥反序列化器

这是有效的命令

./bin/kafka-avro-console-consumer \
--bootstrap-server <bootstrap-server> \
--consumer.config client-ssl.properties \
--property schema.registry.url=<schema-registry-url> \
--topic <name-of-topic> \
--property print.key=true \
--property print.value=true \
--value-deserializer io.confluent.kafka.serializers.KafkaAvroDeserializer \
--key-deserializer org.apache.kafka.common.serialization.StringDeserializer

/bin/kafka avro控制台消费者\
--引导服务器\
--consumer.config client-ssl.properties\
--属性架构。注册表。url=\
--话题\
--属性print.key=true\
--属性print.value=true\
--值反序列化器io.confluent.kafka.serializers.KafkaAvroDeserializer\
--密钥反序列化程序org.apache.kafka.common.serialization.StringDeserializer
我解决了这个问题。这是因为我没有在命令中指定密钥反序列化器

这是有效的命令

./bin/kafka-avro-console-consumer \
--bootstrap-server <bootstrap-server> \
--consumer.config client-ssl.properties \
--property schema.registry.url=<schema-registry-url> \
--topic <name-of-topic> \
--property print.key=true \
--property print.value=true \
--value-deserializer io.confluent.kafka.serializers.KafkaAvroDeserializer \
--key-deserializer org.apache.kafka.common.serialization.StringDeserializer

/bin/kafka avro控制台消费者\
--引导服务器\
--consumer.config client-ssl.properties\
--属性架构。注册表。url=\
--话题\
--属性print.key=true\
--属性print.value=true\
--值反序列化器io.confluent.kafka.serializers.KafkaAvroDeserializer\
--密钥反序列化程序org.apache.kafka.common.serialization.StringDeserializer

[2019-08-26 16:30:36,351] ERROR Error processing message, skipping this message:  (kafka.tools.ConsoleConsumer$:76)
org.apache.kafka.common.errors.SerializationException: Error deserializing Avro message for id -1
Caused by: org.apache.kafka.common.errors.SerializationException: Unknown magic byte!

./bin/kafka-avro-console-consumer \
--bootstrap-server <bootstrap-server> \
--consumer.config client-ssl.properties \
--property schema.registry.url=<schema-registry-url> \
--topic <name-of-topic> \
--property print.key=true \
--property print.value=true \
--value-deserializer io.confluent.kafka.serializers.KafkaAvroDeserializer \
--key-deserializer org.apache.kafka.common.serialization.StringDeserializer