InfluxDB缺少标签值（putInfluxDB nifi处理器）

Question

i'm new in InfluxDB, the problem consists in that i have to insert python dicts in InfluxDB via Nifi and i have tried different ways and i allways got the same error telling that tag is missing:

org.influxdb.InfluxDBException: {
    "error": "unable to parse '[
        {
          "measurement": "sensor",
          "time": 1559560006,
          "tags": [
            "sensor",
            "id",
            "date",
            "info",
            "aleatory_number",
            "aleatory_number_square_root"
          ],
          "fields": {
            "id": 8,
            "date": 1559559961002,
            "info": "info sensor8",
            "aleatory_number": 1778687859,
            "aleatory_number_square_root": 42174.492
          }
        }
      ]': missing tag value"
} 

Another example:

{
  "error":"unable to parse 
  '[{
    "measurement":"sensor",
    "time":1559630455,
    "tags":{"test_tag":"test"},
    "fields":{}
    }]'
    : missing tag value"
}

Another:

org.influxdb.InfluxDBException: 
{
  "error":"unable to parse 
  '[{
    "measurement":"sensor",
    "time":1559631341,
    "tags":{},
    "fields":{}
    }]'
    : missing tag value"}

My last try follows this avro schema:

{
  "type": "record",
  "name": "preprocessed_value",
  "fields": [
    { "name": "measurement", "type": "string"  },
    { "name": "time", "type": "long"  },
    { "name": "tags", "type": { "type":"map", "values" : "string"}  },
    { 
      "name" : "fields" , 
      "type" : {
        "name" : "PythonDict",
        "type" : "record",
        "fields": [
          { "name": "id",                           "type": "int" },
          { "name": "date",                         "type": "long"  },
          { "name": "info",                         "type": "string"  },
          { "name": "aleatory_number",              "type": "long"  },
          { "name": "aleatory_number_square_root",  "type": "float" }
        ]
      } 
    }
  ]
}

And i got the same error using tags and fields simultaneously:

org.influxdb.InfluxDBException: {"error":"unable to parse 
  '[{
    "measurement":"sensor",
    "time":1559720142,
    "tags":{"test_tag":"test"},
    "fields":{
      "id":3,
      "date":1559718332366,
      "info":"info sensor3",
      "aleatory_number":141969819,
      "aleatory_number_square_root":11915.108
      }
  }]': missing tag value"}

Answer 1

If the record(point as per InfluxDB terminology) that you are trying to insert into measurement 'sensor' do not have value or has null value for any tags, you will get this error.

I am not sure, why you have almost similar tags and fields for your measurement. For a point, tag columns are mandatory data and field columns are optional.

Execute following command on influx cli:

show tag keys from sensor;

This will list all tagged columns from your measurement. Make sure you are passing all those while trying to insert new point.

Answer 2

In your first example, none of your tags have values. In your second example, you are writing a point that has no fields; which is not allowed either.

Your point should look like:

{
    "measurement":"sensor",
    "time":1559630455,
    "tags":{"test_tag":"test"},
    "fields":{"some_field": 1}
}