InfluxDB

InfluxDB is a time series database designed to handle high write and query loads. It is an integral component of the TICK stack. InfluxDB is meant to be used as a backing store for any use case involving large amounts of timestamped data, including DevOps monitoring, application metrics, IoT sensor data, and real-time analytics.

HoraeDB support InfluxDB v1.8 write and query API.

Warn: users need to add following config to server’s config in order to try InfluxDB write/query.

1
2

[server.default_schema_config]
default_timestamp_column_name = "time"

Write

1
2
3
4
5
6

curl -i -XPOST "http://localhost:5440/influxdb/v1/write" --data-binary '
demo,tag1=t1,tag2=t2 field1=90,field2=100 1679994647000
demo,tag1=t1,tag2=t2 field1=91,field2=101 1679994648000
demo,tag1=t11,tag2=t22 field1=90,field2=100 1679994647000
demo,tag1=t11,tag2=t22 field1=91,field2=101 1679994648000
'

Post payload is in InfluxDB line protocol format.

Measurement will be mapped to table in HoraeDB, and it will be created automatically in first write(Note: The default TTL is 7d, and points written exceed TTL will be discarded directly).

For example, when inserting data above, table below will be automatically created in HoraeDB:

1
2
3
4
5
6
7
8
9

CREATE TABLE `demo` (
    `tsid` uint64 NOT NULL,
    `time` timestamp NOT NULL,
    `field1` double,
    `field2` double,
    `tag1` string TAG,
    `tag2` string TAG,
    PRIMARY KEY (tsid, time),
    timestamp KEY (time))

Note

• When InfluxDB writes data, the timestamp precision is nanosecond by default, HoraeDB only supports millisecond timestamp, user can specify the data precision by precision parameter, HoraeDB will automatically convert to millisecond precision internally.
• Query string parameters such as db aren’t supported.

Query

1

 curl -G 'http://localhost:5440/influxdb/v1/query' --data-urlencode 'q=SELECT * FROM "demo"'

Query result is same with InfluxDB:

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19

{
  "results": [
    {
      "statement_id": 0,
      "series": [
        {
          "name": "demo",
          "columns": ["time", "field1", "field2", "tag1", "tag2"],
          "values": [
            [1679994647000, 90.0, 100.0, "t1", "t2"],
            [1679994647000, 90.0, 100.0, "t11", "t22"],
            [1679994648000, 91.0, 101.0, "t1", "t2"],
            [1679994648000, 91.0, 101.0, "t11", "t22"]
          ]
        }
      ]
    }
  ]
}

Usage in Grafana

HoraeDB can be used as InfluxDB data source in Grafana.

• Select InfluxDB type when add data source
• Then input http://{ip}:{5440}/influxdb/v1/ in HTTP URL. For local deployment, URL is http://localhost:5440/influxdb/v1/
• Save & test

Note

Query string parameters such as epoch, db, pretty aren’t supported.