Source Table

Function

Flink SQL jobs read from the Doris source table.

Prerequisites

• An enhanced datasource connection has been created for DLI to connect to Doris, so that jobs can run on the dedicated queue of DLI and you can set the security group rules as required.
  • For details about how to create an enhanced datasource connection, see Enhanced Datasource Connections.
  • For details about how to configure security group rules, see Security Groups.
• If MRS Doris is used, IP addresses of all hosts in the MRS cluster have been added to host information of the enhanced datasource connection.

• Kerberos authentication is disabled for the cluster (the cluster is in normal mode)

  After connecting to Doris as user admin, create a role with administrator permissions, and bind the role to the user.

Caveats

• When you create a Flink OpenSource SQL job, set Flink Version to 1.15 in the Running Parameters tab. Select Save Job Log, and specify the OBS bucket for saving job logs.
• Storing authentication credentials such as usernames and passwords in code or plaintext poses significant security risks. It is recommended using DEW to manage credentials instead. Storing encrypted credentials in configuration files or environment variables and decrypting them when needed ensures security. For details, see .
• Kerberos authentication is disabled for the cluster (the cluster is in normal mode)
• Doris table names are case sensitive.
• When Doris of CloudTable is used, set the port number in the fenodes field to 8030, for example, xx:8030. In addition, enable ports 8030, 8040, and 9030 in the security group.
• After HTTPS is enabled, add the following configuration parameters to the with clause for creating a table:
  • 'doris.enable.https' = 'true'
  • 'doris.ignore.https.ca' = 'true'

Syntax

create table dorisSource (
  attr_name attr_type 
  (',' attr_name attr_type)* 
 )
with (
  'connector' = 'doris',
  'fenodes' = 'FE_IP:PORT,FE_IP:PORT,FE_IP:PORT',
  'table.identifier' = 'database.table',
  'username' = 'dorisUsername',
  'password' = 'dorisPassword'
);

Parameter Description

Shared configuration

Example

This example reads data from a Doris source table and inputs it into the Print connector.

1. Create an enhanced datasource connection in the VPC and subnet where Doris locates, and bind the connection to the required Flink elastic resource pool. For details, see Enhanced Datasource Connections. Add MRS host information for the enhanced datasource connection.
2. Set Doris security groups and add inbound rules to allow access from the Flink queue. Test the connectivity using the Doris address by referring to Testing Address Connectivity. If the connection passes the test, it is bound to the queue.
3. Create a Doris table and insert 10 data records into the table. The creation statement is as follows:

   CREATE TABLE IF NOT EXISTS dorisdemo
   (
     `user_id` varchar(10) NOT NULL,
     `city` varchar(10),
     `age` int,
     `gender` int
   )
   DISTRIBUTED BY HASH(`user_id`) BUCKETS 10;
   
   INSERT INTO dorisdemo VALUES ('user1', 'city1', 20, 1);
   INSERT INTO dorisdemo VALUES ('user2', 'city2', 21, 0);
   INSERT INTO dorisdemo VALUES ('user3', 'city3', 22, 1);
   INSERT INTO dorisdemo VALUES ('user4', 'city4', 23, 0);
   INSERT INTO dorisdemo VALUES ('user5', 'city5', 24, 1);
   INSERT INTO dorisdemo VALUES ('user6', 'city6', 25, 0);
   INSERT INTO dorisdemo VALUES ('user7', 'city7', 26, 1);
   INSERT INTO dorisdemo VALUES ('user8', 'city8', 27, 0);
   INSERT INTO dorisdemo VALUES ('user9', 'city9', 28, 1);
   INSERT INTO dorisdemo VALUES ('user10', 'city10', 29, 0);

4. Create a Flink OpenSource SQL job. Enter the following job script and submit the job. The job script reads from the Doris table and prints the output.

   CREATE TABLE dorisDemo (
     `user_id` String NOT NULL,
     `city` String,
     `age` int,
     `gender` int
   ) with (
     'connector' = 'doris',
     'fenodes' = 'FE_IP:PORT,FE_IP:PORT,FE_IP:PORT',
     'table.identifier' = 'demo.dorisdemo',
     'username' = 'dorisUser',
     'password' = 'dorisPassword',
     'doris.request.retries'='3',
     'doris.batch.size' = '100'
   );
   
   CREATE TABLE print (
     `user_id` String NOT NULL,
     `city` String,
     `age` int,
     `gender` int
   ) with (
     'connector' = 'print'
   );
   
   insert into print select * from dorisDemo;

5. View the data in the Print result table.

   +I[user5, city5, 24, 1]
   +I[user4, city4, 23, 0]
   +I[user3, city3, 22, 1]
   +I[user10, city10, 29, 0]
   +I[user6, city6, 25, 0]
   +I[user1, city1, 20, 1]
   +I[user9, city9, 28, 1]
   +I[user7, city7, 26, 1]
   +I[user8, city8, 27, 0]
   +I[user2, city2, 21, 0]