gsd_cn/source/CNStream/configs/kafka.json

{
    "kafka_producer" : {
        "class_name" : "cnstream::Kafka",
        "parallelism" : 1,
        "max_input_queue_size" : 20,
        "custom_params" : {
            "handler" : "DefaultKafkaHandler",
            "topic" : "CnstreamData",
            "brokers" : "localhost:9092"
        }
    }
}