未指定的类型参数

Question

我有这个消费者设置正在使用以下代码中来自Kafka主题的消息：

def kafkaSetup(ssc: StreamingContext): InputDStream[MessageAndMetadata[String, String]] = {
    val kafkaParams = Map(
         "auto.offset.reset" -> "smallest",
         "metadata.broker.list" -> config.getString("props.brokerList")
    )

    val props = new Properties()
    props.put("bootstrap.servers", config.getString("props.brokerList"))
    props.put("group.id", config.getString("props.groupId"))
    props.put("enable.auto.commit", config.getString("props.autoCommit"))
    props.put("auto.commit.interval.ms", config.getString("props.autoCommitInterval"));
    props.put("session.timeout.ms", config.getString("props.sessionTimeoutInterval"))
    props.put("key.deserializer", "org.apache.kafka.common.serialization.StringDeserializer")
    props.put("value.deserializer", "org.apache.kafka.common.serialization.StringDeserializer")

    val consumer = new KafkaConsumer[String, String](props)
    consumer.subscribe(config.getString("topic"))

    val lines = KafkaUtils.createStream(
      ssc, 
      config.getString("Zookkeeprer"), 
      config.getString("ConsumerKafkaProps.groupId"), 
      config.getString("Kafka.topic"), 
      StorageLevel.MEMORY_AND_DISK_SER_2)

  

未指定的值参数：kafkaParams：util.Map [String，String]，主题：util.Map [String，Integer]，storageLevel：StorageLevel