Apache Flink：从 Kafka 读取数据作为字节数组

Question

如何从 Kafka 读取 byte[] 格式的数据？

我有一个将事件读取为String 和SimpleStringSchema() 的实现，但我找不到将数据读取为byte[] 的架构。

这是我的代码：

    Properties properties = new Properties();
    properties.setProperty("bootstrap.servers", "kafka1:9092");
    properties.setProperty("zookeeper.connect", "zookeeper1:2181");
    properties.setProperty("group.id", "test");
    properties.setProperty("key.deserializer","org.apache.kafka.common.serialization.StringDeserializer");
    properties.setProperty("value.deserializer", "org.apache.kafka.common.serialization.ByteArrayDeserializer");
    properties.setProperty("auto.offset.reset", "earliest");
    DataStream<byte[]> stream = env
                .addSource(new FlinkKafkaConsumer010<byte[]>("testStr", ? ,properties));

Answer 1

对于scala，你应该写如下

new AbstractDeserializationSchema[Array[Byte]](){
     override def deserialize(bytes: Array[Byte]): Array[Byte] = bytes
}

Answer 2

最后我发现：

DataStream<byte[]> stream = env
            .addSource(new FlinkKafkaConsumer010<>("testStr", new AbstractDeserializationSchema<byte[]>() {
                @Override
                public byte[] deserialize(byte[] bytes) throws IOException {
                    return bytes;
                }
            }, properties));