Doris

Overview

Doris Extract node supports reading data from Doris. This chapter describes how to set up a Doris Extract node to run SQL queries against the Doris database.

Supported Version

Extract Node	Doris version
Doris	0.13+

Dependencies

In order to set up the Doris Extract node, the dependency information needed to use build automation tools such as Maven or SBT is provided below.

Maven dependency

<dependency>
    <groupId>org.apache.inlong</groupId>
    <artifactId>sort-connector-doris</artifactId>
    <version>1.9.0</version>
</dependency>

Prepare

Create a Doris Extract table

First create a table doris_extract_node in the Doris database, the command is as follows:

[root@fe001 ~]# mysql -u root -h localhost -P 9030 -p000000
mysql> use test;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
mysql> CREATE TABLE `doris_extract_node` (
       `id` int(11) NOT NULL COMMENT "user id",
       `name` varchar(50) NOT NULL COMMENT "user name",
       `dr` tinyint(4) NULL COMMENT "delete tag"
       ) ENGINE=OLAP
       UNIQUE KEY(`id`)
       COMMENT "OLAP"
       DISTRIBUTED BY HASH(`id`) BUCKETS 1
       PROPERTIES (
       "replication_allocation" = "tag.location.default: 1",
       "in_memory" = "false",
       "storage_format" = "V2"
       );
Query OK, 0 rows affected (0.03 sec)

mysql> insert into doris_extract_node values(1, 'zhangsan', 0),(2, 'lisi', 0),(3, 'wangwu', 0);
Query OK, 3 rows affected (0.07 sec)
{'label':'insert_29d973e9509a48d4-a20e9f0e2d510605', 'status':'VISIBLE', 'txnId':'1032'}

mysql> select * from doris_extract_node;
+------+---------+------+
| id   | name    | dr   |
+------+---------+------+
|    1 | zhansan |    0 |
|    2 | lisi    |    0 |
|    3 | wangwu  |    0 |
+------+---------+------+
3 rows in set (0.02 sec)       

How to create a Doris Extract Node

Usage for SQL API

The following example shows how to create a Doris Extract node with Flink SQL:

• connector is doris

# Start flink sql-client, load the doris connector jar package
[root@tasknode001 flink-1.13.5]# ./bin/sql-client.sh -l ./opt/connectors/doris/

-- Create Doris table 'doris_extract_node' using Flink SQL
Flink SQL> CREATE TABLE doris_extract_node (
           `id` INT,
           `name` STRINTG,
           `dr` TINYINT
           ) WITH (
           'connector' = 'doris',
           'fenodes' = 'localhost:8030',
           'table.identifier' = 'test.doris_extract_node',
           'username' = 'root',
           'password' = '000000'
           );
  
-- query data
Flink SQL> SELECT * FROM doris_extract_node;

Usage for InLong Dashboard

TODO: It will be supported in the future.

Usage for InLong Manager Client

TODO: It will be supported in the future.

Doris Extract Node Options

Option	Required	Default	Type	Description
connector	required	(none)	string	Specify which connector to use, valid values are: doris
fenodes	required	(none)	string	Doris FE http address, support multiple addresses, separated by commas
table.identifier	required	(none)	string	Doris table identifier, eg, db1.tbl1
username	required	(none)	string	Doris username
password	required	(none)	string	Doris password
doris.request.retries	optional	3	int	Number of retries to send requests to Doris
doris.request.connect.timeout.ms	optional	30000	int	Connection timeout for sending requests to Doris
doris.request.read.timeout.ms	optional	30000	int	Read timeout for sending request to Doris
doris.request.query.timeout.s	optional	3600	int	Query the timeout time of doris, the default is 1 hour, -1 means no timeout limit
doris.request.tablet.size	optional	Integer.MAX_VALUE	int	The number of Doris Tablets corresponding to an Partition. The smaller this value is set, the more partitions will be generated. This will increase the parallelism on the flink side, but at the same time will cause greater pressure on Doris.
doris.batch.size	optional	1024	int	The maximum number of rows to read data from BE at one time. Increasing this value can reduce the number of connections between Flink and Doris. Thereby reducing the extra time overhead caused by network delay.
doris.exec.mem.limit	optional	2147483648	long	Memory limit for a single query. The default is 2GB, in bytes.
doris.deserialize.arrow.async	optional	false	boolean	Whether to support asynchronous conversion of Arrow format to RowBatch required for flink-doris-connector iteration
doris.deserialize.queue.size	optional	64	int	Asynchronous conversion of the internal processing queue in Arrow format takes effect when doris.deserialize.arrow.async is true
doris.read.field	optional	(none)	string	List of column names in the Doris table, separated by commas
doris.filter.query	optional	(none)	string	Filter expression of the query, which is transparently transmitted to Doris. Doris uses this expression to complete source-side data filtering.

Data Type Mapping

Doris Type	Flink Type
NULL_TYPE	NULL
BOOLEAN	BOOLEAN
TINYINT	TINYINT
SMALLINT	SMALLINT
INT	INT
BIGINT	BIGINT
FLOAT	FLOAT
DOUBLE	DOUBLE
DATE	STRING
DATETIME	STRING
DECIMAL	DECIMAL
CHAR	STRING
LARGEINT	STRING
VARCHAR	STRING
DECIMALV2	DECIMAL
TIME	DOUBLE
HLL	Unsupported datatype

See flink-doris-connector for more details.