Creating a Table and Associating It with DCS

Function

This statement is used to create a table and associate it with an existing DCS key.

Prerequisites

Before creating a table and associating it with DCS, you need to create a datasource connection and bind it to a queue. For details about operations on the management console, see

Syntax

Specified key

      
           CREATE TABLE [IF NOT EXISTS] TABLE_NAME(
    FIELDNAME1 FIELDTYPE1,
    FIELDNAME2 FIELDTYPE2)
  USING REDIS OPTIONS (
  'host'='xx',
  'port'='xx',
  'passwdauth' = 'xxx',
  'encryption' = 'true',
  'table'='namespace_in_redis:key_in_redis',
  'key.column'= 'FIELDNAME1'
);

Wildcard key

      
           CREATE TABLE [IF NOT EXISTS] TABLE_NAME(
    FIELDNAME1 FIELDTYPE1,
    FIELDNAME2 FIELDTYPE2)
  USING REDIS OPTIONS (
  'host'='xx',
  'port'='xx',
  'passwdauth' = 'xxx',
  'encryption' = 'true',
  'keys.pattern'='key*:*',
  'key.column'= 'FIELDNAME1'
);

Keyword

**Table 1** CREATE TABLE parameter description
Parameter	Description
host	To connect to DCS, you need to create a datasource connection first. After creating an enhanced datasource connection, use the connection address provided by DCS. If there are multiple connection addresses, select one of them. NOTE: Currently, only enhanced datasource is supported.
port	DCS connection port, for example, 6379.
password	Password entered during DCS cluster creation. You do not need to set this parameter when accessing a non-secure Redis cluster.
passwdauth	Datasource password authentication name. For details about how to create datasource authentication, see in the Data Lake Insight User Guide.
encryption	Set this parameter to true when datasource password authentication is used.
table	The key or hash key in Redis. This parameter is mandatory when Redis data is inserted. Either this parameter or the keys.pattern parameter when Redis data is queried.
keys.pattern	Use a regular expression to match multiple keys or hash keys. This parameter is used only for query. Either this parameter or table is used to query Redis data.
key.column	(Optional) Specifies a field in the schema as the key ID in Redis. This parameter is used together with the table parameter when data is inserted.
partitions.number	Number of concurrent tasks during data reading.
scan.count	Number of data records read in each batch. The default value is 100. If the CPU usage of the Redis cluster still needs to be improved during data reading, increase the value of this parameter.
iterator.grouping.size	Number of data records inserted in each batch. The default value is 100. If the CPU usage of the Redis cluster still needs to be improved during the insertion, increase the value of this parameter.
timeout	Timeout interval for connecting to the Redis, in milliseconds. The default value is 2000 (2 seconds).

When connecting to DCS, complex data types such as Array, Struct, and Map are not supported.

The following methods can be used to process complex data:

Place the fields of the next level in the Schema field of the same level.
Write and read data in binary mode, and encode and decode it using user-defined functions.

Example

Specified table

    
         create table test_redis(name string, age int) using redis options(
  'host' = '192.168.4.199',
  'port' = '6379',
  'passwdauth' = 'xxx',
  'encryption' = 'true',
  'table' = 'person'
);

Wildcard table name

    
         create table test_redis_keys_patten(id string, name string, age int) using redis options(
  'host' = '192.168.4.199',
  'port' = '6379',
  'passwdauth' = 'xxx',
  'encryption' = 'true',
  'keys.pattern' = 'p*:*',
  'key.column' = 'id'
);