{"type":"record","name":"TUPLE_1","fields":[
  {"name":"act_content","type":
    ["null",
     {"type":"array","items":
      {"type":"record","name":"TUPLE_2","fields":
        [{"name":"key","type":"string"},
         {"name":"val","type":"string"}]
      }
     }
    ]
  },
  {"name":"action_type","type":["null","string"]},
  {"name":"browser_id","type":["null","string"]},
  {"name":"component_version","type":"int"},
  {"name":"member_id","type":"int"},
  {"name":"page_key","type":["null","string"]},
  {"name":"session_id","type":"long"},
  {"name":"tracking_time","type":"long"},
  {"name":"type","type":["null","string"]}]
}
