CloudTable OpenTSDB Sink Stream

Function

DLI exports the job output data to OpenTSDB of CloudTable. OpenTSDB is a distributed, scalable time series database based on HBase. It stores time series data. Time series data refers to the data collected at different time points. This type of data reflects the change status or degree of an object over time. OpenTSDB supports data collection and monitoring in seconds, permanent storage, index, and queries. It can be used for system monitoring and measurement as well as collection and monitoring of IoT data, financial data, and scientific experimental results.

CloudTable is a distributed, scalable, and fully-hosted key-value data storage service based on Apache HBase. It provides DLI with high-performance random read and write capabilities, which are helpful when applications need to store and query a massive amount of structured data, semi-structured data, and time series data. CloudTable applies to IoT scenarios and storage and query of massive volumes of key-value data. For more information about CloudTable, see the CloudTable Service User Guide.

Prerequisites

In this scenario, jobs must run on the dedicated queue of DLI. Therefore, DLI must interconnect with the enhanced datasource connection that has been connected with CloudTable HBase. You can also set the security group rules as required.
For details about how to create an enhanced datasource connection, see Enhanced Datasource Connections in the Data Lake Insight User Guide.

For details about how to configure security group rules, see Security Group in the Virtual Private Cloud User Guide.

Syntax

CREATE SINK STREAM stream_id (attr_name attr_type (',' attr_name attr_type)* )
  WITH (
    type = "opentsdb",
    region = "",
    cluster_id = "",
    tsdb_metrics = "",
    tsdb_timestamps = "",
    tsdb_values = "",
    tsdb_tags = "",
    batch_insert_data_num = ""
  )

Keyword

**Table 1** Keyword description
Parameter	Mandatory	Description
type	Yes	Output channel type. opentsdb indicates that data is exported to CloudTable (OpenTSDB).
region	Yes	Region to which CloudTable belongs.
cluster_id	No	ID of the cluster to which the data to be inserted belongs. Either this parameter or tsdb_link_address must be specified.
tsdb_metrics	Yes	Metric of a data point, which can be specified through parameter configurations.
tsdb_timestamps	Yes	Timestamp of a data point. The data type can be LONG, INT, SHORT, or STRING. Only dynamic columns are supported.
tsdb_values	Yes	Value of a data point. The data type can be SHORT, INT, LONG, FLOAT, DOUBLE, or STRING. Dynamic columns or constant values are supported.
tsdb_tags	Yes	Tags of a data point. Each of tags contains at least one tag value and up to eight tag values. Tags of the data point can be specified through parameter configurations.
batch_insert_data_num	No	Number of data records to be written in batches at a time. The value must be a positive integer. The upper limit is 65536. The default value is 8.
tsdb_link_address	No	OpenTSDB link of the cluster to which the data to be inserted belongs. If this parameter is used, the job must run in a dedicated DLI queue, and the DLI queue must be connected to the CloudTable cluster through an enhanced datasource connection. Either this parameter or cluster_id must be specified. NOTE: For details about how to configure security group rules, see Security Group in the Virtual Private Cloud User Guide.

Precautions

If a configuration item can be specified through parameter configurations, one or more columns in the record can be used as part of the configuration item. For example, if the configuration item is set to car_$ {car_brand} and the value of car_brand in a record is BMW, the value of this configuration item is car_BMW in the record.

Example

Output data of stream weather_out to CloudTable (OpenTSDB).

CREATE SINK STREAM weather_out (
  timestamp_value LONG, /* Time */
  temperature FLOAT, /* Temperature value */
  humidity FLOAT, /* Humidity */
  location STRING /* Location */
)
  WITH (
    type = "opentsdb",
    region = "xxx",
    cluster_id = "e05649d6-00e2-44b4-b0ff-7194adaeab3f",
    tsdb_metrics = "weather",
    tsdb_timestamps = "${timestamp_value}",
    tsdb_values = "${temperature}; ${humidity}",
    tsdb_tags = "location:${location},signify:temperature; location:${location},signify:humidity",
    batch_insert_data_num = "10"
);