{
  "type":"record",
  "name":"message_name",
  "namespace":"message_namespace",
  "fields":[
    {
      "name":"field_1",
      "type":["long"]
    },
    {
      "name":"field_2",
      "type":["string"]
    },
    {
      "name":"field_3",
      "type":["int"]
    },
    {
      "name":"extra",
      "type":["long"]
    }
  ]
}

