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Version: 2.3.3

IoTDB

IoTDB source connector

Description​

Read external data source data through IoTDB.

Key features​

supports query SQL and can achieve projection effect.

Options​

nametyperequireddefault value
hoststringno-
portintno-
node_urlsstringno-
usernamestringyes-
passwordstringyes-
sqlstringyes-
schemaconfigyes-
fetch_sizeintno-
lower_boundlongno-
upper_boundlongno-
num_partitionsintno-
thrift_default_buffer_sizeintno-
enable_cache_leaderbooleanno-
versionstringno-
common-optionsno-

single node, you need to set host and port to connect to the remote data source.​

host [string] the host of the IoTDB when you select host of the IoTDB

port [int] the port of the IoTDB when you select

multi node, you need to set node_urls to connect to the remote data source.​

node_urls [string] the node_urls of the IoTDB when you select

e.g.

127.0.0.1:8080,127.0.0.2:8080

other parameters​

sql [string] execute sql statement e.g.

select name,age from test

schema [config]​

fields [Config]​

The schema of the IoTDB that you want to generate

e.g.

schema {
fields {
name = string
age = int
}
}

option parameters​

fetch_size [int]​

the fetch_size of the IoTDB when you select

username [string]​

the username of the IoTDB when you select

password [string]​

the password of the IoTDB when you select

lower_bound [long]​

the lower_bound of the IoTDB when you select

upper_bound [long]​

the upper_bound of the IoTDB when you select

num_partitions [int]​

the num_partitions of the IoTDB when you select

thrift_default_buffer_size [int]​

the thrift_default_buffer_size of the IoTDB when you select

enable_cache_leader [boolean]​

enable_cache_leader of the IoTDB when you select

version [string]​

Version represents the SQL semantic version used by the client, which is used to be compatible with the SQL semantics of 0.12 when upgrading 0.13. The possible values are: V_0_12, V_0_13.

split partitions​

we can split the partitions of the IoTDB and we used time column split

num_partitions [int]​

split num

upper_bound [long]​

upper bound of the time column

lower_bound [long]​

lower bound of the time column

     split the time range into numPartitions parts
if numPartitions is 1, use the whole time range
if numPartitions < (upper_bound - lower_bound), use (upper_bound - lower_bound) partitions

eg: lower_bound = 1, upper_bound = 10, numPartitions = 2
sql = "select * from test where age > 0 and age < 10"

split result

split 1: select * from test where (time >= 1 and time < 6) and ( age > 0 and age < 10 )

split 2: select * from test where (time >= 6 and time < 11) and ( age > 0 and age < 10 )

common options​

Source plugin common parameters, please refer to Source Common Options for details

Examples​

Case1​

Common options:

source {
IoTDB {
node_urls = "localhost:6667"
username = "root"
password = "root"
}
}

When you assign sql、fields、partition, for example:

sink {
IoTDB {
...
sql = "SELECT temperature, moisture FROM root.test_group.* WHERE time < 4102329600000 align by device"
lower_bound = 1
upper_bound = 4102329600000
num_partitions = 10
fields {
ts = bigint
device_name = string

temperature = float
moisture = bigint
}
}
}

Upstream IoTDB data format is the following:

IoTDB> SELECT temperature, moisture FROM root.test_group.* WHERE time < 4102329600000 align by device;
+------------------------+------------------------+--------------+-----------+
| Time| Device| temperature| moisture|
+------------------------+------------------------+--------------+-----------+
|2022-09-25T00:00:00.001Z|root.test_group.device_a| 36.1| 100|
|2022-09-25T00:00:00.001Z|root.test_group.device_b| 36.2| 101|
|2022-09-25T00:00:00.001Z|root.test_group.device_c| 36.3| 102|
+------------------------+------------------------+--------------+-----------+

Loaded to SeaTunnelRow data format is the following:

tsdevice_nametemperaturemoisture
1664035200001root.test_group.device_a36.1100
1664035200001root.test_group.device_b36.2101
1664035200001root.test_group.device_c36.3102

Changelog​

2.2.0-beta 2022-09-26​

  • Add IoTDB Source Connector

2.3.0-beta 2022-10-20​

  • [Improve] Improve IoTDB Source Connector (2917)
    • Support extract timestamp、device、measurement from SeaTunnelRow
    • Support TINYINT、SMALLINT
    • Support flush cache to database before prepareCommit