CloudTable HBase Sink Stream

Function

DLI exports the job output data to HBase of CloudTable. HBase is a column-oriented distributed cloud storage system that features enhanced reliability, excellent performance, and elastic scalability. It applies to the storage of massive amounts of data and distributed computing. You can use HBase to build a storage system capable of storing TB- or even PB-level data. With HBase, you can filter and analyze data with ease and get responses in milliseconds, rapidly mining data value. Structured and semi-structured key-value data can be stored, including messages, reports, recommendation data, risk control data, logs, and orders. With DLI, you can write massive volumes of data to HBase at a high speed and with low latency.

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 = "cloudtable",
    region = "",
    cluster_id = "",
    table_name = "",
    table_columns = "",
    create_if_not_exist = ""
  )

Keyword

**Table 1** Keyword description
Parameter	Mandatory	Description
type	Yes	Output channel type. cloudtable indicates that data is exported to CloudTable (HBase).
region	Yes	Region to which CloudTable belongs.
cluster_id	Yes	ID of the cluster to which the data you want to insert belongs.
table_name	Yes	Name of the table, into which data is to be inserted. It can be specified through parameter configurations. For example, if you want one or more certain columns as part of the table name, use car_pass_inspect_with_age_${car_age}, where car_age is the column name.
table_columns	Yes	Columns to be inserted. The format is rowKey, f1:c1, f1:c2, f2:c1, where rowKey must be specified. If you do not want to add a column (for example, the third column) to the database, set this parameter to rowKey,f1:c1,,f2:c1.
illegal_data_table	No	If this parameter is specified, abnormal data (for example, rowKey does not exist) will be written into the table. If not specified, abnormal data will be discarded. The rowKey value is a timestamp followed by six random digits, and the schema is info:data, info:reason.
create_if_not_exist	No	Whether to create a table or column into which the data is written when this table or column does not exist. The value can be true or false. The default value is false.
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 100. The default value is 10.

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.
In this way, data is written to HBase of CloudTable. The speed is limited. The dedicated resource mode is recommended.
For details about how to create a dedicated resource mode, see Creating a Queue in the Data Lake Insight User Guide.

Example

Output data of stream qualified_cars to CloudTable (HBase).

CREATE SINK STREAM qualified_cars (
  car_id STRING,
  car_owner STRING,
  car_age INT,
  average_speed INT,
  total_miles INT
)
  WITH (
    type = "cloudtable",
    region = "xxx",
    cluster_id = "209ab1b6-de25-4c48-8e1e-29e09d02de28",
    table_name = "car_pass_inspect_with_age_${car_age}",
    table_columns = "rowKey,info:owner,,car:speed,car:miles",
    illegal_data_table = "illegal_data",
    create_if_not_exist = "true",
    batch_insert_data_num = "20"
);