我想知道在汇合中心使用datagenconnector的过程，以便为测试主题生成随机数据。
我尝试用一些设置连接datagen连接器，但总是失败。
更新：我尝试连接在主题中创建的我自己的模式，但它没有将其连接起来，并且datagen连接器无法启动。
下面是datagen connect的配置：

{
  "value.converter.schema.registry.url": "http://localhost:8081",
  "value.converter.schemas.enable": "false",
  "name": "datagen-protobuf-userprofile",
  "connector.class": "io.confluent.kafka.connect.datagen.DatagenConnector",
  "tasks.max": "1",
  "key.converter": "org.apache.kafka.connect.storage.StringConverter",
  "value.converter": "io.confluent.connect.protobuf.ProtobufConverter",
  "transforms": [
    "SetSchemaMetadata"
  ],
  "transforms.SetSchemaMetadata.type": "org.apache.kafka.connect.transforms.SetSchemaMetadata$Value",
  "transforms.SetSchemaMetadata.schema.name": "value_User_PROFILE",
  "kafka.topic": "User_PROFILE",
  "max.interval": "1000",
  "iterations": "10000000",
  "schema.filename": "value_User_PROFILE",
  "schema.keyfield": "userid",
  "quickstart": "value_User_PROFILE"
}

新主题中定义的架构：

{
  "doc": "Sample schema to help you get started.",
  "fields": [
    {
      "doc": "The int type is a 32-bit signed integer.",
      "name": "userid",
      "type": "int"
    },
    {
      "doc": "The string is a unicode character sequence.",
      "name": "firstname",
      "type": "string"
    },
    {
      "doc": "The string is a unicode character sequence.",
      "name": "lastname",
      "type": "string"
    },
    {
      "doc": "The string is a unicode character sequence.",
      "name": "countrycode",
      "type": "string"
    },
    {
      "doc": "this si double which store floting value as well",
      "name": "rating",
      "type": "double"
    }
  ],
  "name": "value_User_PROFILE",
  "namespace": "com.mycorp.mynamespace",
  "type": "record"
}