Apache NiFi is an easy to use, powerful, and reliable system to process and distribute data.
Apache NiFi supports powerful and scalable directed graphs of data routing, transformation, and system mediation logic.
Apache NiFi includes the following capabilities:
This is a processor that reads the content of the incoming FlowFile as individual records using the configured ‘Record Reader’ and writes them to Apache IoTDB using native interface.
property | description | default value | necessary |
---|---|---|---|
Host | The host of IoTDB. | null | true |
Port | The port of IoTDB. | 6667 | true |
Username | Username to access the IoTDB. | null | true |
Password | Password to access the IoTDB. | null | true |
Record Reader | Specifies the type of Record Reader controller service to use for parsing the incoming data and determining the schema. | null | true |
Schema | The schema that IoTDB needs doesn‘t support good by NiFi. Therefore, you can define the schema here. Besides, you can set encoding type and compression type by this method. If you don’t set this property, the inferred schema will be used. It can be updated by expression language. | null | false |
Aligned | Whether using aligned interface? It can be updated by expression language. | false | false |
MaxRowNumber | Specifies the max row number of each tablet. It can be updated by expression language. | 1024 | false |
There are a couple of rules about flowfile:
Record Reader
.Time
, and it must be the first.STRING
or LONG
.root.
.INT
, LONG
, FLOAT
, DOUBLE
, BOOLEAN
, TEXT
.As mentioned above, converting schema by property which is more flexible and stronger than inferred schema.
The structure of property Schema
:
{ "timeType": "LONG", "fields": [{ "tsName": "root.sg.d1.s1", "dataType": "INT32", "encoding": "RLE", "compressionType": "GZIP" }, { "tsName": "root.sg.d1.s2", "dataType": "INT64", "encoding": "RLE", "compressionType": "GZIP" }] }
Note
Time
. The rest must be arranged in the same order as in field
of JSON.timeType
and fields
.LONG
and STRING
for timeType
.tsName
and dataType
must be set.root.
.dataTypes
are INT32
, INT64
, FLOAT
, DOUBLE
, BOOLEAN
, TEXT
.encoding
are PLAIN
, DICTIONARY
, RLE
, DIFF
, TS_2DIFF
, BITMAP
, GORILLA_V1
, REGULAR
, GORILLA
.compressionType
are UNCOMPRESSED
, SNAPPY
, GZIP
, LZO
, SDT
, PAA
, PLA
, LZ4
.relationship | description |
---|---|
success | Data can be written correctly or flow file is empty. |
failure | The shema or flow file is abnormal. |