关于flink:实时数仓基于Flink111的SQL构建实时数仓探索实践

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实时数仓次要是为了解决传统数仓数据时效性低的问题,实时数仓通常会用在实时的 OLAP 剖析、实时的数据看板、业务指标实时监控等场景。尽管对于实时数仓的架构及技术选型与传统的离线数仓会存在差别,然而对于数仓建设的根本方法论是统一的。本文会分享基于 Flink SQL 从 0 到 1 搭建一个实时数仓的 demo,波及数据采集、存储、计算、可视化整个解决流程。通过本文你能够理解到:

  • 实时数仓的根本架构
  • 实时数仓的数据处理流程
  • Flink1.11 的 SQL 新个性
  • Flink1.11 存在的 bug
  • 残缺的操作案例

今人学识无遗力,少壮时间老始成。

纸上得来终觉浅,绝知此事要躬行。

案例简介

本文会以电商业务为例,展现实时数仓的数据处理流程。另外,本文旨在阐明实时数仓的构建流程,所以不会波及太简单的数据计算。为了保障案例的可操作性和完整性,本文会给出具体的操作步骤。为了不便演示,本文的所有操作都是在 Flink SQL Cli 中实现的。

架构设计

具体的架构设计如图所示:首先通过 canal 解析 MySQL 的 binlog 日志,将数据存储在 Kafka 中。而后应用 Flink SQL 对原始数据进行荡涤关联,并将解决之后的明细宽表写入 kafka 中。维表数据存储在 MySQL 中,通过 Flink SQL 对明细宽表与维表进行 JOIN,将聚合后的数据写入 MySQL,最初通过 FineBI 进行可视化展现。

业务数据筹备

  • 订单表(order_info)
CREATE TABLE `order_info` (`id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT '编号',
  `consignee` varchar(100) DEFAULT NULL COMMENT '收货人',
  `consignee_tel` varchar(20) DEFAULT NULL COMMENT '收件人电话',
  `total_amount` decimal(10,2) DEFAULT NULL COMMENT '总金额',
  `order_status` varchar(20) DEFAULT NULL COMMENT '订单状态',
  `user_id` bigint(20) DEFAULT NULL COMMENT '用户 id',
  `payment_way` varchar(20) DEFAULT NULL COMMENT '付款形式',
  `delivery_address` varchar(1000) DEFAULT NULL COMMENT '送货地址',
  `order_comment` varchar(200) DEFAULT NULL COMMENT '订单备注',
  `out_trade_no` varchar(50) DEFAULT NULL COMMENT '订单交易编号(第三方领取用)',
  `trade_body` varchar(200) DEFAULT NULL COMMENT '订单形容(第三方领取用)',
  `create_time` datetime DEFAULT NULL COMMENT '创立工夫',
  `operate_time` datetime DEFAULT NULL COMMENT '操作工夫',
  `expire_time` datetime DEFAULT NULL COMMENT '生效工夫',
  `tracking_no` varchar(100) DEFAULT NULL COMMENT '物流单编号',
  `parent_order_id` bigint(20) DEFAULT NULL COMMENT '父订单编号',
  `img_url` varchar(200) DEFAULT NULL COMMENT '图片门路',
  `province_id` int(20) DEFAULT NULL COMMENT '地区',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8 COMMENT='订单表';
  • 订单详情表(order_detail)
CREATE TABLE `order_detail` (`id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT '编号',
  `order_id` bigint(20) DEFAULT NULL COMMENT '订单编号',
  `sku_id` bigint(20) DEFAULT NULL COMMENT 'sku_id',
  `sku_name` varchar(200) DEFAULT NULL COMMENT 'sku 名称(冗余)',
  `img_url` varchar(200) DEFAULT NULL COMMENT '图片名称(冗余)',
  `order_price` decimal(10,2) DEFAULT NULL COMMENT '购买价格(下单时 sku 价格)',
  `sku_num` varchar(200) DEFAULT NULL COMMENT '购买个数',
  `create_time` datetime DEFAULT NULL COMMENT '创立工夫',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8 COMMENT='订单详情表';
  • 商品表(sku_info)
CREATE TABLE `sku_info` (`id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT 'skuid(itemID)',
  `spu_id` bigint(20) DEFAULT NULL COMMENT 'spuid',
  `price` decimal(10,0) DEFAULT NULL COMMENT '价格',
  `sku_name` varchar(200) DEFAULT NULL COMMENT 'sku 名称',
  `sku_desc` varchar(2000) DEFAULT NULL COMMENT '商品规格形容',
  `weight` decimal(10,2) DEFAULT NULL COMMENT '分量',
  `tm_id` bigint(20) DEFAULT NULL COMMENT '品牌(冗余)',
  `category3_id` bigint(20) DEFAULT NULL COMMENT '三级分类 id(冗余)',
  `sku_default_img` varchar(200) DEFAULT NULL COMMENT '默认显示图片(冗余)',
  `create_time` datetime DEFAULT NULL COMMENT '创立工夫',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8 COMMENT='商品表';
  • 商品一级类目表(base_category1)
CREATE TABLE `base_category1` (`id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT '编号',
  `name` varchar(10) NOT NULL COMMENT '分类名称',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8 COMMENT='一级分类表';
  • 商品二级类目表(base_category2)
CREATE TABLE `base_category2` (`id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT '编号',
  `name` varchar(200) NOT NULL COMMENT '二级分类名称',
  `category1_id` bigint(20) DEFAULT NULL COMMENT '一级分类编号',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8 COMMENT='二级分类表';
  • 商品三级类目表(base_category3)
CREATE TABLE `base_category3` (`id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT '编号',
  `name` varchar(200) NOT NULL COMMENT '三级分类名称',
  `category2_id` bigint(20) DEFAULT NULL COMMENT '二级分类编号',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8 COMMENT='三级分类表';
  • 省份表(base_province)
CREATE TABLE `base_province` (`id` int(20) DEFAULT NULL COMMENT 'id',
  `name` varchar(20) DEFAULT NULL COMMENT '省名称',
  `region_id` int(20) DEFAULT NULL COMMENT '大区 id',
  `area_code` varchar(20) DEFAULT NULL COMMENT '行政区位码'
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
  • 区域表(base_region)
CREATE TABLE `base_region` (`id` int(20) NOT NULL COMMENT '大区 id',
  `region_name` varchar(20) DEFAULT NULL COMMENT '大区名称',
   PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

留神:以上的建表语句是在 MySQL 中实现的,残缺的建表及模仿数据生成脚本见:

链接:https://pan.baidu.com/s/1fcMg… 提取码:zuqw

数据处理流程

ODS 层数据同步

对于 ODS 层的数据同步参见我的另一篇文章基于 Canal 与 Flink 实现数据实时增量同步(一)。次要应用 canal 解析 MySQL 的 binlog 日志,而后将其写入到 Kafka 对应的 topic 中。因为篇幅限度,不会对具体的细节进行阐明。同步之后的后果如下图所示:

DIM 层维表数据筹备

本案例中将维表存储在了 MySQL 中,理论生产中会用 HBase 存储维表数据。咱们次要用到两张维表:区域维表 商品维表。处理过程如下:

  • 区域维表

首先将 mydw.base_provincemydw.base_region这个主题对应的数据抽取到 MySQL 中,次要应用 Flink SQL 的 Kafka 数据源对应的 canal-json 格局,留神:在执行装载之前,须要先在 MySQL 中创立对应的表,本文应用的 MySQL 数据库的名字为dim,用于寄存维表数据。如下:

-- -------------------------
--   省份
--   kafka Source
-- ------------------------- 
DROP TABLE IF EXISTS `ods_base_province`;
CREATE TABLE `ods_base_province` (
  `id` INT,
  `name` STRING,
  `region_id` INT ,
  `area_code`STRING
) WITH(
'connector' = 'kafka',
 'topic' = 'mydw.base_province',
 'properties.bootstrap.servers' = 'kms-3:9092',
 'properties.group.id' = 'testGroup',
 'format' = 'canal-json' ,
 'scan.startup.mode' = 'earliest-offset' 
) ; 

-- -------------------------
--   省份
--   MySQL Sink
-- ------------------------- 
DROP TABLE IF EXISTS `base_province`;
CREATE TABLE `base_province` (
    `id` INT,
    `name` STRING,
    `region_id` INT ,
    `area_code`STRING,
    PRIMARY KEY (id) NOT ENFORCED
) WITH (
    'connector' = 'jdbc',
    'url' = 'jdbc:mysql://kms-1:3306/dim',
    'table-name' = 'base_province', -- MySQL 中的待插入数据的表
    'driver' = 'com.mysql.jdbc.Driver',
    'username' = 'root',
    'password' = '123qwe',
    'sink.buffer-flush.interval' = '1s'
);

-- -------------------------
--   省份
--   MySQL Sink Load Data
-- ------------------------- 
INSERT INTO base_province
SELECT *
FROM ods_base_province;

-- -------------------------
--   区域
--   kafka Source
-- ------------------------- 
DROP TABLE IF EXISTS `ods_base_region`;
CREATE TABLE `ods_base_region` (
  `id` INT,
  `region_name` STRING
) WITH(
'connector' = 'kafka',
 'topic' = 'mydw.base_region',
 'properties.bootstrap.servers' = 'kms-3:9092',
 'properties.group.id' = 'testGroup',
 'format' = 'canal-json' ,
 'scan.startup.mode' = 'earliest-offset' 
) ; 

-- -------------------------
--   区域
--   MySQL Sink
-- ------------------------- 
DROP TABLE IF EXISTS `base_region`;
CREATE TABLE `base_region` (
    `id` INT,
    `region_name` STRING,
     PRIMARY KEY (id) NOT ENFORCED
) WITH (
    'connector' = 'jdbc',
    'url' = 'jdbc:mysql://kms-1:3306/dim',
    'table-name' = 'base_region', -- MySQL 中的待插入数据的表
    'driver' = 'com.mysql.jdbc.Driver',
    'username' = 'root',
    'password' = '123qwe',
    'sink.buffer-flush.interval' = '1s'
);

-- -------------------------
--   区域
--   MySQL Sink Load Data
-- ------------------------- 
INSERT INTO base_region
SELECT *
FROM ods_base_region;

通过下面的步骤,将创立维表所须要的原始数据曾经存储到了 MySQL 中,接下来就须要在 MySQL 中创立维表,咱们应用下面的两张表,创立一张视图:dim_province作为维表:

-- ---------------------------------
-- DIM 层, 区域维表,
-- 在 MySQL 中创立视图
-- ---------------------------------
DROP VIEW IF EXISTS dim_province;
CREATE VIEW dim_province AS
SELECT
  bp.id AS province_id,
  bp.name AS province_name,
  br.id AS region_id,
  br.region_name AS region_name,
  bp.area_code AS area_code
FROM base_region br 
     JOIN base_province bp ON br.id= bp.region_id
;

这样咱们所须要的维表:dim_province 就创立好了,只须要在维表 join 时,应用 Flink SQL 创立 JDBC 的数据源,就能够应用该维表了。同理,咱们应用雷同的办法创立商品维表,具体如下:

-- -------------------------
--  一级类目表
--   kafka Source
-- ------------------------- 
DROP TABLE IF EXISTS `ods_base_category1`;
CREATE TABLE `ods_base_category1` (
  `id` BIGINT,
  `name` STRING
)WITH(
 'connector' = 'kafka',
 'topic' = 'mydw.base_category1',
 'properties.bootstrap.servers' = 'kms-3:9092',
 'properties.group.id' = 'testGroup',
 'format' = 'canal-json' ,
 'scan.startup.mode' = 'earliest-offset' 
) ;

-- -------------------------
--  一级类目表
--   MySQL Sink
-- ------------------------- 
DROP TABLE IF EXISTS `base_category1`;
CREATE TABLE `base_category1` (
    `id` BIGINT,
    `name` STRING,
     PRIMARY KEY (id) NOT ENFORCED
) WITH (
    'connector' = 'jdbc',
    'url' = 'jdbc:mysql://kms-1:3306/dim',
    'table-name' = 'base_category1', -- MySQL 中的待插入数据的表
    'driver' = 'com.mysql.jdbc.Driver',
    'username' = 'root',
    'password' = '123qwe',
    'sink.buffer-flush.interval' = '1s'
);

-- -------------------------
--  一级类目表
--   MySQL Sink Load Data
-- ------------------------- 

INSERT INTO base_category1
SELECT *
FROM ods_base_category1;

-- -------------------------
--  二级类目表
--   kafka Source
-- ------------------------- 
DROP TABLE IF EXISTS `ods_base_category2`;
CREATE TABLE `ods_base_category2` (
  `id` BIGINT,
  `name` STRING,
  `category1_id` BIGINT
)WITH(
'connector' = 'kafka',
 'topic' = 'mydw.base_category2',
 'properties.bootstrap.servers' = 'kms-3:9092',
 'properties.group.id' = 'testGroup',
 'format' = 'canal-json' ,
 'scan.startup.mode' = 'earliest-offset' 
) ;

-- -------------------------
--  二级类目表
--   MySQL Sink
-- ------------------------- 
DROP TABLE IF EXISTS `base_category2`;
CREATE TABLE `base_category2` (
    `id` BIGINT,
    `name` STRING,
    `category1_id` BIGINT,
     PRIMARY KEY (id) NOT ENFORCED
) WITH (
    'connector' = 'jdbc',
    'url' = 'jdbc:mysql://kms-1:3306/dim',
    'table-name' = 'base_category2', -- MySQL 中的待插入数据的表
    'driver' = 'com.mysql.jdbc.Driver',
    'username' = 'root',
    'password' = '123qwe',
    'sink.buffer-flush.interval' = '1s'
);

-- -------------------------
--  二级类目表
--   MySQL Sink Load Data
-- ------------------------- 
INSERT INTO base_category2
SELECT *
FROM ods_base_category2;

-- -------------------------
-- 三级类目表
--   kafka Source
-- ------------------------- 
DROP TABLE IF EXISTS `ods_base_category3`;
CREATE TABLE `ods_base_category3` (
  `id` BIGINT,
  `name` STRING,
  `category2_id` BIGINT
)WITH(
'connector' = 'kafka',
 'topic' = 'mydw.base_category3',
 'properties.bootstrap.servers' = 'kms-3:9092',
 'properties.group.id' = 'testGroup',
 'format' = 'canal-json' ,
 'scan.startup.mode' = 'earliest-offset' 
) ; 

-- -------------------------
--  三级类目表
--   MySQL Sink
-- ------------------------- 
DROP TABLE IF EXISTS `base_category3`;
CREATE TABLE `base_category3` (
    `id` BIGINT,
    `name` STRING,
    `category2_id` BIGINT,
    PRIMARY KEY (id) NOT ENFORCED
) WITH (
    'connector' = 'jdbc',
    'url' = 'jdbc:mysql://kms-1:3306/dim',
    'table-name' = 'base_category3', -- MySQL 中的待插入数据的表
    'driver' = 'com.mysql.jdbc.Driver',
    'username' = 'root',
    'password' = '123qwe',
    'sink.buffer-flush.interval' = '1s'
);

-- -------------------------
--  三级类目表
--   MySQL Sink Load Data
-- ------------------------- 
INSERT INTO base_category3
SELECT *
FROM ods_base_category3;

-- -------------------------
--   商品表
--   Kafka Source
-- ------------------------- 

DROP TABLE IF EXISTS `ods_sku_info`;
CREATE TABLE `ods_sku_info` (
  `id` BIGINT,
  `spu_id` BIGINT,
  `price` DECIMAL(10,0),
  `sku_name` STRING,
  `sku_desc` STRING,
  `weight` DECIMAL(10,2),
  `tm_id` BIGINT,
  `category3_id` BIGINT,
  `sku_default_img` STRING,
  `create_time` TIMESTAMP(0)
) WITH(
 'connector' = 'kafka',
 'topic' = 'mydw.sku_info',
 'properties.bootstrap.servers' = 'kms-3:9092',
 'properties.group.id' = 'testGroup',
 'format' = 'canal-json' ,
 'scan.startup.mode' = 'earliest-offset' 
) ; 

-- -------------------------
--   商品表
--   MySQL Sink
-- ------------------------- 
DROP TABLE IF EXISTS `sku_info`;
CREATE TABLE `sku_info` (
  `id` BIGINT,
  `spu_id` BIGINT,
  `price` DECIMAL(10,0),
  `sku_name` STRING,
  `sku_desc` STRING,
  `weight` DECIMAL(10,2),
  `tm_id` BIGINT,
  `category3_id` BIGINT,
  `sku_default_img` STRING,
  `create_time` TIMESTAMP(0),
   PRIMARY KEY (tm_id) NOT ENFORCED
) WITH (
    'connector' = 'jdbc',
    'url' = 'jdbc:mysql://kms-1:3306/dim',
    'table-name' = 'sku_info', -- MySQL 中的待插入数据的表
    'driver' = 'com.mysql.jdbc.Driver',
    'username' = 'root',
    'password' = '123qwe',
    'sink.buffer-flush.interval' = '1s'
);

-- -------------------------
--   商品
--   MySQL Sink Load Data
-- ------------------------- 
INSERT INTO sku_info
SELECT *
FROM ods_sku_info;

通过下面的步骤,咱们能够将创立商品维表的根底数据表同步到 MySQL 中,同样须要提前创立好对应的数据表。接下来咱们应用下面的根底表在 mySQL 的 dim 库中创立一张视图:dim_sku_info,用作后续应用的维表。

-- ---------------------------------
-- DIM 层, 商品维表,
-- 在 MySQL 中创立视图
-- ---------------------------------
CREATE VIEW dim_sku_info AS
SELECT
  si.id AS id,
  si.sku_name AS sku_name,
  si.category3_id AS c3_id,
  si.weight AS weight,
  si.tm_id AS tm_id,
  si.price AS price,
  si.spu_id AS spu_id,
  c3.name AS c3_name,
  c2.id AS c2_id,
  c2.name AS c2_name,
  c3.id AS c1_id,
  c3.name AS c1_name
FROM
(
  sku_info si 
  JOIN base_category3 c3 ON si.category3_id = c3.id
  JOIN base_category2 c2 ON c3.category2_id =c2.id
  JOIN base_category1 c1 ON c2.category1_id = c1.id
);

至此,咱们所须要的维表数据曾经筹备好了,接下来开始解决 DWD 层的数据。

DWD 层数据处理

通过下面的步骤,咱们曾经将所用的维表曾经筹备好了。接下来咱们将对 ODS 的原始数据进行解决,加工成 DWD 层的明细宽表。具体过程如下:

-- -------------------------
--   订单详情
--   Kafka Source
-- ------------------------- 

DROP TABLE IF EXISTS `ods_order_detail`;
CREATE TABLE `ods_order_detail`(
  `id` BIGINT,
  `order_id` BIGINT,
  `sku_id` BIGINT,
  `sku_name` STRING,
  `img_url` STRING,
  `order_price` DECIMAL(10,2),
  `sku_num` INT,
  `create_time` TIMESTAMP(0)
) WITH(
 'connector' = 'kafka',
 'topic' = 'mydw.order_detail',
 'properties.bootstrap.servers' = 'kms-3:9092',
 'properties.group.id' = 'testGroup',
 'format' = 'canal-json' ,
 'scan.startup.mode' = 'earliest-offset' 
) ; 

-- -------------------------
--   订单信息
--   Kafka Source
-- -------------------------
DROP TABLE IF EXISTS `ods_order_info`;
CREATE TABLE `ods_order_info` (
  `id` BIGINT,
  `consignee` STRING,
  `consignee_tel` STRING,
  `total_amount` DECIMAL(10,2),
  `order_status` STRING,
  `user_id` BIGINT,
  `payment_way` STRING,
  `delivery_address` STRING,
  `order_comment` STRING,
  `out_trade_no` STRING,
  `trade_body` STRING,
  `create_time` TIMESTAMP(0) ,
  `operate_time` TIMESTAMP(0) ,
  `expire_time` TIMESTAMP(0) ,
  `tracking_no` STRING,
  `parent_order_id` BIGINT,
  `img_url` STRING,
  `province_id` INT
) WITH(
'connector' = 'kafka',
 'topic' = 'mydw.order_info',
 'properties.bootstrap.servers' = 'kms-3:9092',
 'properties.group.id' = 'testGroup',
 'format' = 'canal-json' ,
 'scan.startup.mode' = 'earliest-offset' 
) ; 

-- ---------------------------------
-- DWD 层, 领取订单明细表 dwd_paid_order_detail
-- ---------------------------------
DROP TABLE IF EXISTS dwd_paid_order_detail;
CREATE TABLE dwd_paid_order_detail
(
  detail_id BIGINT,
  order_id BIGINT,
  user_id BIGINT,
  province_id INT,
  sku_id BIGINT,
  sku_name STRING,
  sku_num INT,
  order_price DECIMAL(10,0),
  create_time TIMESTAMP(0),
  pay_time TIMESTAMP(0)
 ) WITH (
    'connector' = 'kafka',
    'topic' = 'dwd_paid_order_detail',
    'scan.startup.mode' = 'earliest-offset',
    'properties.bootstrap.servers' = 'kms-3:9092',
    'format' = 'changelog-json'
);
-- ---------------------------------
-- DWD 层, 已领取订单明细表
-- 向 dwd_paid_order_detail 装载数据
-- ---------------------------------
INSERT INTO dwd_paid_order_detail
SELECT
  od.id,
  oi.id order_id,
  oi.user_id,
  oi.province_id,
  od.sku_id,
  od.sku_name,
  od.sku_num,
  od.order_price,
  oi.create_time,
  oi.operate_time
FROM
    (
    SELECT * 
    FROM ods_order_info
    WHERE order_status = '2' -- 已领取
    ) oi JOIN
    (
    SELECT *
    FROM ods_order_detail
    ) od 
    ON oi.id = od.order_id;

ADS 层数据

通过下面的步骤,咱们创立了一张 dwd_paid_order_detail 明细宽表,并将该表存储在了 Kafka 中。接下来咱们将应用这张明细宽表与维表进行 JOIN,失去咱们 ADS 应用层数据。

  • ads_province_index

首先在 MySQL 中创立对应的 ADS 指标表:ads_province_index

CREATE TABLE ads.ads_province_index(province_id INT(10),
  area_code VARCHAR(100),
  province_name VARCHAR(100),
  region_id INT(10),
  region_name VARCHAR(100),
  order_amount DECIMAL(10,2),
  order_count BIGINT(10),
  dt VARCHAR(100),
  PRIMARY KEY (province_id, dt) 
) ;

向 MySQL 的 ADS 层指标装载数据:

-- Flink SQL Cli 操作
-- ---------------------------------
-- 应用 DDL 创立 MySQL 中的 ADS 层表
-- 指标:1. 每天每个省份的订单数
--      2. 每天每个省份的订单金额
-- ---------------------------------
CREATE TABLE ads_province_index(
  province_id INT,
  area_code STRING,
  province_name STRING,
  region_id INT,
  region_name STRING,
  order_amount DECIMAL(10,2),
  order_count BIGINT,
  dt STRING,
  PRIMARY KEY (province_id, dt) NOT ENFORCED  
) WITH (
    'connector' = 'jdbc',
    'url' = 'jdbc:mysql://kms-1:3306/ads',
    'table-name' = 'ads_province_index', 
    'driver' = 'com.mysql.jdbc.Driver',
    'username' = 'root',
    'password' = '123qwe'
);
-- ---------------------------------
-- dwd_paid_order_detail 已领取订单明细宽表
-- ---------------------------------
CREATE TABLE dwd_paid_order_detail
(
  detail_id BIGINT,
  order_id BIGINT,
  user_id BIGINT,
  province_id INT,
  sku_id BIGINT,
  sku_name STRING,
  sku_num INT,
  order_price DECIMAL(10,2),
  create_time STRING,
  pay_time STRING
 ) WITH (
    'connector' = 'kafka',
    'topic' = 'dwd_paid_order_detail',
    'scan.startup.mode' = 'earliest-offset',
    'properties.bootstrap.servers' = 'kms-3:9092',
    'format' = 'changelog-json'
);

-- ---------------------------------
-- tmp_province_index
-- 订单汇总长期表
-- ---------------------------------
CREATE TABLE tmp_province_index(
    province_id INT,
    order_count BIGINT,-- 订单数
    order_amount DECIMAL(10,2), -- 订单金额
    pay_date DATE
)WITH (
    'connector' = 'kafka',
    'topic' = 'tmp_province_index',
    'scan.startup.mode' = 'earliest-offset',
    'properties.bootstrap.servers' = 'kms-3:9092',
    'format' = 'changelog-json'
);
-- ---------------------------------
-- tmp_province_index
-- 订单汇总长期表数据装载
-- ---------------------------------
INSERT INTO tmp_province_index
SELECT
      province_id,
      count(distinct order_id) order_count,-- 订单数
      sum(order_price * sku_num) order_amount, -- 订单金额
      TO_DATE(pay_time,'yyyy-MM-dd') pay_date
FROM dwd_paid_order_detail
GROUP BY province_id,TO_DATE(pay_time,'yyyy-MM-dd')
;
-- ---------------------------------
-- tmp_province_index_source
-- 应用该长期汇总表,作为数据源
-- ---------------------------------
CREATE TABLE tmp_province_index_source(
    province_id INT,
    order_count BIGINT,-- 订单数
    order_amount DECIMAL(10,2), -- 订单金额
    pay_date DATE,
    proctime as PROCTIME()   -- 通过计算列产生一个解决工夫列) WITH (
    'connector' = 'kafka',
    'topic' = 'tmp_province_index',
    'scan.startup.mode' = 'earliest-offset',
    'properties.bootstrap.servers' = 'kms-3:9092',
    'format' = 'changelog-json'
);

-- ---------------------------------
-- DIM 层, 区域维表,
-- 创立区域维表数据源
-- ---------------------------------
DROP TABLE IF EXISTS `dim_province`;
CREATE TABLE dim_province (
  province_id INT,
  province_name STRING,
  area_code STRING,
  region_id INT,
  region_name STRING ,
  PRIMARY KEY (province_id) NOT ENFORCED
) WITH (
    'connector' = 'jdbc',
    'url' = 'jdbc:mysql://kms-1:3306/dim',
    'table-name' = 'dim_province', 
    'driver' = 'com.mysql.jdbc.Driver',
    'username' = 'root',
    'password' = '123qwe',
    'scan.fetch-size' = '100'
);

-- ---------------------------------
-- 向 ads_province_index 装载数据
-- 维表 JOIN
-- ---------------------------------

INSERT INTO ads_province_index
SELECT
  pc.province_id,
  dp.area_code,
  dp.province_name,
  dp.region_id,
  dp.region_name,
  pc.order_amount,
  pc.order_count,
  cast(pc.pay_date as VARCHAR)
FROM
tmp_province_index_source pc
  JOIN dim_province FOR SYSTEM_TIME AS OF pc.proctime as dp 
  ON dp.province_id = pc.province_id;

当提交工作之后:察看 Flink WEB UI:

查看 ADS 层的 ads_province_index 表数据:

  • ads_sku_index

首先在 MySQL 中创立对应的 ADS 指标表:ads_sku_index

CREATE TABLE ads_sku_index
(sku_id BIGINT(10),
  sku_name VARCHAR(100),
  weight DOUBLE,
  tm_id BIGINT(10),
  price DOUBLE,
  spu_id BIGINT(10),
  c3_id BIGINT(10),
  c3_name VARCHAR(100) ,
  c2_id BIGINT(10),
  c2_name VARCHAR(100),
  c1_id BIGINT(10),
  c1_name VARCHAR(100),
  order_amount DOUBLE,
  order_count BIGINT(10),
  sku_count BIGINT(10),
  dt varchar(100),
  PRIMARY KEY (sku_id,dt)
);

向 MySQL 的 ADS 层指标装载数据:

-- ---------------------------------
-- 应用 DDL 创立 MySQL 中的 ADS 层表
-- 指标:1. 每天每个商品对应的订单个数
--      2. 每天每个商品对应的订单金额
--      3. 每天每个商品对应的数量
-- ---------------------------------
CREATE TABLE ads_sku_index
(
  sku_id BIGINT,
  sku_name VARCHAR,
  weight DOUBLE,
  tm_id BIGINT,
  price DOUBLE,
  spu_id BIGINT,
  c3_id BIGINT,
  c3_name VARCHAR ,
  c2_id BIGINT,
  c2_name VARCHAR,
  c1_id BIGINT,
  c1_name VARCHAR,
  order_amount DOUBLE,
  order_count BIGINT,
  sku_count BIGINT,
  dt varchar,
  PRIMARY KEY (sku_id,dt) NOT ENFORCED
) WITH (
    'connector' = 'jdbc',
    'url' = 'jdbc:mysql://kms-1:3306/ads',
    'table-name' = 'ads_sku_index', 
    'driver' = 'com.mysql.jdbc.Driver',
    'username' = 'root',
    'password' = '123qwe'
);

-- ---------------------------------
-- dwd_paid_order_detail 已领取订单明细宽表
-- ---------------------------------
CREATE TABLE dwd_paid_order_detail
(
  detail_id BIGINT,
  order_id BIGINT,
  user_id BIGINT,
  province_id INT,
  sku_id BIGINT,
  sku_name STRING,
  sku_num INT,
  order_price DECIMAL(10,2),
  create_time STRING,
  pay_time STRING
 ) WITH (
    'connector' = 'kafka',
    'topic' = 'dwd_paid_order_detail',
    'scan.startup.mode' = 'earliest-offset',
    'properties.bootstrap.servers' = 'kms-3:9092',
    'format' = 'changelog-json'
);

-- ---------------------------------
-- tmp_sku_index
-- 商品指标统计
-- ---------------------------------
CREATE TABLE tmp_sku_index(
    sku_id BIGINT,
    order_count BIGINT,-- 订单数
    order_amount DECIMAL(10,2), -- 订单金额
    order_sku_num BIGINT,
    pay_date DATE
)WITH (
    'connector' = 'kafka',
    'topic' = 'tmp_sku_index',
    'scan.startup.mode' = 'earliest-offset',
    'properties.bootstrap.servers' = 'kms-3:9092',
    'format' = 'changelog-json'
);
-- ---------------------------------
-- tmp_sku_index
-- 数据装载
-- ---------------------------------
INSERT INTO tmp_sku_index
SELECT
      sku_id,
      count(distinct order_id) order_count,-- 订单数
      sum(order_price * sku_num) order_amount, -- 订单金额
      sum(sku_num) order_sku_num,
      TO_DATE(pay_time,'yyyy-MM-dd') pay_date
FROM dwd_paid_order_detail
GROUP BY sku_id,TO_DATE(pay_time,'yyyy-MM-dd')
;

-- ---------------------------------
-- tmp_sku_index_source
-- 应用该长期汇总表,作为数据源
-- ---------------------------------
CREATE TABLE tmp_sku_index_source(
    sku_id BIGINT,
    order_count BIGINT,-- 订单数
    order_amount DECIMAL(10,2), -- 订单金额
    order_sku_num BIGINT,
    pay_date DATE,
    proctime as PROCTIME()   -- 通过计算列产生一个解决工夫列) WITH (
    'connector' = 'kafka',
    'topic' = 'tmp_sku_index',
    'scan.startup.mode' = 'earliest-offset',
    'properties.bootstrap.servers' = 'kms-3:9092',
    'format' = 'changelog-json'
);
-- ---------------------------------
-- DIM 层, 商品维表,
-- 创立商品维表数据源
-- ---------------------------------
DROP TABLE IF EXISTS `dim_sku_info`;
CREATE TABLE dim_sku_info (
  id BIGINT,
  sku_name STRING,
  c3_id BIGINT,
  weight DECIMAL(10,2),
  tm_id BIGINT,
  price DECIMAL(10,2),
  spu_id BIGINT,
  c3_name STRING,
  c2_id BIGINT,
  c2_name STRING,
  c1_id BIGINT,
  c1_name STRING,
  PRIMARY KEY (id) NOT ENFORCED
) WITH (
    'connector' = 'jdbc',
    'url' = 'jdbc:mysql://kms-1:3306/dim',
    'table-name' = 'dim_sku_info', 
    'driver' = 'com.mysql.jdbc.Driver',
    'username' = 'root',
    'password' = '123qwe',
    'scan.fetch-size' = '100'
);
-- ---------------------------------
-- 向 ads_sku_index 装载数据
-- 维表 JOIN
-- ---------------------------------
INSERT INTO ads_sku_index
SELECT
  sku_id ,
  sku_name ,
  weight ,
  tm_id ,
  price ,
  spu_id ,
  c3_id ,
  c3_name,
  c2_id ,
  c2_name ,
  c1_id ,
  c1_name ,
  sc.order_amount,
  sc.order_count ,
  sc.order_sku_num ,
  cast(sc.pay_date as VARCHAR)
FROM
tmp_sku_index_source sc 
  JOIN dim_sku_info FOR SYSTEM_TIME AS OF sc.proctime as ds
  ON ds.id = sc.sku_id
  ;

当提交工作之后:察看 Flink WEB UI:

查看 ADS 层的 ads_sku_index 表数据:

FineBI 后果展现

其余留神点

Flink1.11.0 存在的 bug

当在代码中应用 Flink1.11.0 版本时,如果将一个 change-log 的数据源 insert 到一个 upsert sink 时,会报如下异样:

[ERROR] Could not execute SQL statement. Reason:
org.apache.flink.table.api.TableException: Provided trait [BEFORE_AND_AFTER] can't satisfy required trait [ONLY_UPDATE_AFTER]. This is a bug in planner, please file an issue. 
Current node is TableSourceScan(table=[[default_catalog, default_database, t_pick_order]], fields=[order_no, status])

该 bug 目前已被修复,修复能够在 Flink1.11.1 中应用。

总结

本文次要分享了构建一个实时数仓的 demo 案例,通过本文能够理解实时数仓的数据处理流程,在此基础之上,对 Flink SQL 的 CDC 会有更加粗浅的意识。另外,本文给出了十分具体的应用案例,你能够间接上手进行操作,在实践中摸索实时数仓的构建流程。

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