如何将Protobuf数据从Flink转发到Kafka和stdout？

Question

我想在这里添加一些代码，并对来自Flink的protobuf数据进行stdout。

我正在使用Flink的Apache Kafka连接器将Flink连接到Kafka。

这是我的Flink密码。

val env = StreamExecutionEnvironment.getExecutionEnvironment
val props = new Properties()
props.setProperty("bootstrap.servers", "localhost:9092").
val producer = FlinkKafkaProducer011(topic, new myProtobufSchema, props)
env.addSink(producer)
env.execute("To Kafka")

这是我的Kafka代码。

  val props: Properties = {
    val p = new Properties()
    p.put(StreamsConfig.APPLICATION_ID_CONFIG, "protobuf-application")
    p.put(StreamsConfig.BOOTSTRAP_SERVERS_CONFIG, "localhost:9092")
    p
  }

  val builder: StreamsBuilder = new StreamsBuilder
  // TODO: implement here to stdout 

  val streams: KafkaStreams = new KafkaStreams(builder.build(), props)
  streams.start()

  sys.ShutdownHookThread {
     streams.close(Duration.ofSeconds(10))
  }

Answer 1

您需要设置StreamsBuilder以从主题中使用

val builder: StreamsBuilder = new StreamsBuilder()
    .stream(topic)
    .print(Printed.toSysOut());