Apache Doris 系列： 基础篇-Flink SQL写入Doris

简介

本文介绍 Flink SQL如何流式写入 Apache Doris，分为一下几个部分：

• Flink Doris connector
• Doris FE 节点配置
• Flink SQL 写 Doris

Flink Doris connector

Flink Doris connector 本质是通过Stream Load来时实现数据的查询和写入功能。
支持二阶段提交，可实现Exatly Once的写入。

Doris FE 节点配置

1）需在 apache-doris/fe/fe.conf 配置文件添加如下配置：

enable_http_server_v2 = true

2. 重启 FE 节点

apache-doris/fe/bin/stop_fe.sh
apache-doris/fe/bin/start_fe.sh --daemon

Doris BE 节点配置

1）需在 apache-doris/be/be.conf 配置文件添加如下配置：

enable_stream_load_record = true

2. 重启 BE 节点

apache-doris/be/bin/stop_be.sh
apache-doris/be/bin/start_be.sh --daemon

Doris 建表语句

CREATE TABLE order_info (
  order_date date NOT NULL COMMENT '下单日期',
  order_id int(11) NOT NULL COMMENT '订单id',
  buy_num tinyint(4) NULL COMMENT '购买件数',
  user_id int(11) NULL COMMENT '[-9223372036854775808, 9223372036854775807]',
  create_time datetime NULL COMMENT '创建时间',
  update_time datetime NULL COMMENT '更新时间'
) ENGINE=OLAP
DUPLICATE KEY(order_date, order_id)
COMMENT 'OLAP'
DISTRIBUTED BY HASH(order_id) BUCKETS 2
PROPERTIES (
"replication_allocation" = "tag.location.default: 1"
);

本例使用的明细模型，仅insert操作，如需update/delete，则需选择Unique模型

生成测试数据

通过Flink SQL自带的datagen生成测试数据:

CREATE TABLE order_info_source (
    order_date DATE,
    order_id     INT,
    buy_num      INT,
    user_id      INT,
    create_time  TIMESTAMP(3),
    update_time   TIMESTAMP(3)
) WITH (
  'connector' = 'datagen',
  'rows-per-second' =  '10',
  'fields.order_id.min' = '30001',
  'fields.order_id.max' = '30500',
  'fields.user_id.min' = '10001',
  'fields.user_id.max' = '20001',
  'fields.buy_num.min' = '10',
  'fields.buy_num.max' = '20',
  'number-of-rows' = '100'
)

datagen参数:
'rows-per-second' = '10' : 每秒发送10条数据
'fields.order_id.min' = '30001': order_id最小值为30001
'fields.order_id.max' = '30500': order_id最大值为30500
'fields.user_id.min' = '10001': user_id最小值为10001
'fields.user_id.max' = '20001': user_id最大值为20001
'fields.buy_num.min' = '10': buy_num最小值为10
'fields.buy_num.max' = '20': buy_num最大值为20
'number-of-rows' = '100': 共发送100条数据, 不设置的话会无限量发送数据

更多细节，请前往官网DataGen SQL Connector

注册Doris Sink表

CREATE TABLE order_info_sink (  
order_date DATE,  
order_id INT,  
buy_num INT,
user_id INT,
create_time TIMESTAMP(3),
update_time TIMESTAMP(3)
)  
WITH (
'connector' = 'doris',   
'fenodes' = '192.168.56.104:8030',   
'table.identifier' = 'test.order_info_example',   
'username' = 'test',   
'password' = 'password123',   
'sink.label-prefix' = 'sink_doris_label_8'
)

写入Doris Sink表

insert into order_info_sink select * from order_info_source

通过Mysql客户端查看Doris表的数据

mysql> select * from  test.order_info_example limit 10;
+------------+----------+---------+---------+---------------------+---------------------+
| order_date | order_id | buy_num | user_id | create_time         | update_time         |
+------------+----------+---------+---------+---------------------+---------------------+
| 2022-09-22 |    30007 |      10 |   10560 | 2022-09-22 07:42:21 | 2022-09-22 07:42:21 |
| 2022-09-22 |    30125 |      16 |   17591 | 2022-09-22 07:42:26 | 2022-09-22 07:42:26 |
| 2022-09-22 |    30176 |      17 |   10871 | 2022-09-22 07:42:24 | 2022-09-22 07:42:24 |
| 2022-09-22 |    30479 |      16 |   19847 | 2022-09-22 07:42:25 | 2022-09-22 07:42:25 |
| 2022-09-22 |    30128 |      16 |   19807 | 2022-09-22 07:42:24 | 2022-09-22 07:42:24 |
| 2022-09-22 |    30039 |      13 |   18237 | 2022-09-22 07:42:28 | 2022-09-22 07:42:28 |
| 2022-09-22 |    30060 |      10 |   18309 | 2022-09-22 07:42:24 | 2022-09-22 07:42:24 |
| 2022-09-22 |    30246 |      18 |   10855 | 2022-09-22 07:42:24 | 2022-09-22 07:42:24 |
| 2022-09-22 |    30288 |      19 |   12347 | 2022-09-22 07:42:26 | 2022-09-22 07:42:26 |
| 2022-09-22 |    30449 |      17 |   11488 | 2022-09-22 07:42:23 | 2022-09-22 07:42:23 |
+------------+----------+---------+---------+---------------------+---------------------+
10 rows in set (0.05 sec)

完整代码

src/main/java/FlinkSQLSinkExample.java