v0.0
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# DrdsReader 插件文档
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___
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## 1 快速介绍
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DrdsReader插件实现了从DRDS(分布式RDS)读取数据。在底层实现上,DrdsReader通过JDBC连接远程DRDS数据库,并执行相应的sql语句将数据从DRDS库中SELECT出来。
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DRDS的插件目前DataX只适配了Mysql引擎的场景,DRDS对于DataX而言,就是一套分布式Mysql数据库,并且大部分通信协议遵守Mysql使用场景。
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## 2 实现原理
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简而言之,DrdsReader通过JDBC连接器连接到远程的DRDS数据库,并根据用户配置的信息生成查询SELECT SQL语句并发送到远程DRDS数据库,并将该SQL执行返回结果使用DataX自定义的数据类型拼装为抽象的数据集,并传递给下游Writer处理。
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对于用户配置Table、Column、Where的信息,DrdsReader将其拼接为SQL语句发送到DRDS数据库。不同于普通的Mysql数据库,DRDS作为分布式数据库系统,无法适配所有Mysql的协议,包括复杂的Join等语句,DRDS暂时无法支持。
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## 3 功能说明
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### 3.1 配置样例
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* 配置一个从DRDS数据库同步抽取数据到本地的作业:
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```
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{
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"job": {
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"setting": {
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"speed": {
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//设置传输速度,单位为byte/s,DataX运行会尽可能达到该速度但是不超过它.
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"byte": 1048576
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}
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//出错限制
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"errorLimit": {
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//出错的record条数上限,当大于该值即报错。
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"record": 0,
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//出错的record百分比上限 1.0表示100%,0.02表示2%
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"percentage": 0.02
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}
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},
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"content": [
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{
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"reader": {
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"name": "drdsReader",
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"parameter": {
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// 数据库连接用户名
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"username": "root",
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// 数据库连接密码
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"password": "root",
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"column": [
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"id","name"
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],
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"connection": [
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{
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"table": [
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"table"
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],
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"jdbcUrl": [
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"jdbc:mysql://127.0.0.1:3306/database"
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]
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}
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]
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}
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},
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"writer": {
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//writer类型
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"name": "streamwriter",
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//是否打印内容
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"parameter": {
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"print":true,
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}
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}
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}
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]
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}
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}
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```
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* 配置一个自定义SQL的数据库同步任务到本地内容的作业:
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```
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{
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"job": {
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"setting": {
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},
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"content": [
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{
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"reader": {
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"name": "drdsreader",
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"parameter": {
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"username": "root",
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"password": "root",
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"where": "",
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"connection": [
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{
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"querySql": [
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"select db_id,on_line_flag from db_info where db_id < 10;"
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],
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"jdbcUrl": [
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"jdbc:drds://localhost:3306/database"]
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}
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]
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}
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},
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"writer": {
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"name": "streamwriter",
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"parameter": {
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"print": false,
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"encoding": "UTF-8"
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}
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}
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}
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]
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}
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}
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```
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### 3.2 参数说明
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* **jdbcUrl**
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* 描述:描述的是到对端数据库的JDBC连接信息,使用JSON的数组描述.注意,jdbcUrl必须包含在connection配置单元中。DRDSReader中关于jdbcUrl中JSON数组填写一个JDBC连接即可。
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jdbcUrl按照Mysql官方规范,并可以填写连接附件控制信息。具体请参看[mysql官方文档](http://dev.mysql.com/doc/connector-j/en/connector-j-reference-configuration-properties.html)。
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* 必选:是 <br />
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* 默认值:无 <br />
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* **username**
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* 描述:数据源的用户名 <br />
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* 必选:是 <br />
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* 默认值:无 <br />
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* **password**
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* 描述:数据源指定用户名的密码 <br />
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* 必选:是 <br />
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* 默认值:无 <br />
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* **table**
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* 描述:所选取需要抽取的表。注意,由于DRDS本身就是分布式数据源,因此填写多张表无意义。系统对多表不做校验。<br />
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* 必选:是 <br />
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* 默认值:无 <br />
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* **column**
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* 描述:所配置的表中需要同步的列名集合,使用JSON的数组描述字段信息。用户使用\*代表默认使用所有列配置,例如['\*']。
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支持列裁剪,即列可以挑选部分列进行导出。
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支持列换序,即列可以不按照表schema信息进行导出。
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支持常量配置,用户需要按照Mysql SQL语法格式:
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["id", "\`table\`", "1", "'bazhen.csy'", "null", "to_char(a + 1)", "2.3" , "true"]
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id为普通列名,\`table\`为包含保留在的列名,1为整形数字常量,'bazhen.csy'为字符串常量,null为空指针,to_char(a + 1)为表达式,2.3为浮点数,true为布尔值。
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column必须用户显示指定同步的列集合,不允许为空!
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* 必选:是 <br />
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* 默认值:无 <br />
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* **where**
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* 描述:筛选条件,DrdsReader根据指定的column、table、where条件拼接SQL,并根据这个SQL进行数据抽取。在实际业务场景中,往往会选择当天的数据进行同步,可以将where条件指定为gmt_create > $bizdate 。<br />。
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where条件可以有效地进行业务增量同步。where条件不配置或者为空,视作全表同步数据。
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* 必选:否 <br />
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* 默认值:无 <br />
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* **querySql**
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* 描述:暂时不支持配置querySql模式 <br />
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### 3.3 类型转换
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目前DrdsReader支持大部分DRDS类型,但也存在部分个别类型没有支持的情况,请注意检查你的类型。
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下面列出DrdsReader针对DRDS类型转换列表:
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| DataX 内部类型| DRDS 数据类型 |
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| -------- | ----- |
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| Long |int, tinyint, smallint, mediumint, int, bigint|
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| Double |float, double, decimal|
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| String |varchar, char, tinytext, text, mediumtext, longtext |
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| Date |date, datetime, timestamp, time, year |
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| Boolean |bit, bool |
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| Bytes |tinyblob, mediumblob, blob, longblob, varbinary |
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请注意:
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* `除上述罗列字段类型外,其他类型均不支持`。
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* `类似Mysql,tinyint(1)视作整形`。
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* `类似Mysql,bit类型读取目前是未定义状态。`
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## 4 性能报告
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### 4.1 环境准备
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#### 4.1.1 数据特征
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建表语句:
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CREATE TABLE `tc_biz_vertical_test_0000` (
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`biz_order_id` bigint(20) NOT NULL COMMENT 'id',
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`key_value` varchar(4000) NOT NULL COMMENT 'Key-value的内容',
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`gmt_create` datetime NOT NULL COMMENT '创建时间',
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`gmt_modified` datetime NOT NULL COMMENT '修改时间',
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`attribute_cc` int(11) DEFAULT NULL COMMENT '防止并发修改的标志',
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`value_type` int(11) NOT NULL DEFAULT '0' COMMENT '类型',
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`buyer_id` bigint(20) DEFAULT NULL COMMENT 'buyerid',
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`seller_id` bigint(20) DEFAULT NULL COMMENT 'seller_id',
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PRIMARY KEY (`biz_order_id`,`value_type`),
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KEY `idx_biz_vertical_gmtmodified` (`gmt_modified`)
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) ENGINE=InnoDB DEFAULT CHARSET=gbk COMMENT='tc_biz_vertical'
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单行记录类似于:
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biz_order_id: 888888888
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key_value: ;orderIds:20148888888,2014888888813800;
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gmt_create: 2011-09-24 11:07:20
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gmt_modified: 2011-10-24 17:56:34
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attribute_cc: 1
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value_type: 3
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buyer_id: 8888888
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seller_id: 1
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#### 4.1.2 机器参数
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* 执行DataX的机器参数为:
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1. cpu: 24核 Intel(R) Xeon(R) CPU E5-2630 0 @ 2.30GHz
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2. mem: 48GB
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3. net: 千兆双网卡
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4. disc: DataX 数据不落磁盘,不统计此项
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* DRDS数据库机器参数为:
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1. cpu: 32核 Intel(R) Xeon(R) CPU E5-2650 v2 @ 2.60GHz
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2. mem: 256GB
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3. net: 千兆双网卡
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4. disc: BTWL419303E2800RGN INTEL SSDSC2BB800G4 D2010370
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#### 4.1.3 DataX jvm 参数
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-Xms1024m -Xmx1024m -XX:+HeapDumpOnOutOfMemoryError
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### 4.2 测试报告
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#### 4.2.1 单表测试报告
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| 通道数| 是否按照主键切分| DataX速度(Rec/s)| DataX机器运行负载|DB网卡流出流量(MB/s)|DB运行负载|
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|--------|--------| --------|--------|--------|--------|--------|--------|
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说明:
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1. 这里的单表,主键类型为 bigint(20),范围为:190247559466810-570722244711460,从主键范围划分看,数据分布均匀。
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2. 对单表如果没有安装主键切分,那么配置通道个数不会提升速度,效果与1个通道一样。
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#### 4.2.2 分表测试报告(2个分库,每个分库16张分表,共计32张分表)
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| 通道数| DataX速度(Rec/s)|DataX机器运行负载|DB网卡流出流量(MB/s)|DB运行负载|
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|--------| --------|--------|--------|--------|--------|--------|
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## 5 约束限制
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### 5.1 一致性视图问题
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DRDS本身属于分布式数据库,对外无法提供一致性的多库多表视图,不同于Mysql等单库单表同步,DRDSReader无法抽取同一个时间切片的分库分表快照信息,也就是说DataX DrdsReader抽取底层不同的分表将获取不同的分表快照,无法保证强一致性。
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### 5.2 数据库编码问题
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DRDS本身的编码设置非常灵活,包括指定编码到库、表、字段级别,甚至可以均不同编码。优先级从高到低为字段、表、库、实例。我们不推荐数据库用户设置如此混乱的编码,最好在库级别就统一到UTF-8。
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DrdsReader底层使用JDBC进行数据抽取,JDBC天然适配各类编码,并在底层进行了编码转换。因此DrdsReader不需用户指定编码,可以自动获取编码并转码。
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对于DRDS底层写入编码和其设定的编码不一致的混乱情况,DrdsReader对此无法识别,对此也无法提供解决方案,对于这类情况,`导出有可能为乱码`。
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### 5.3 增量数据同步
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DrdsReader使用JDBC SELECT语句完成数据抽取工作,因此可以使用SELECT...WHERE...进行增量数据抽取,方式有多种:
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* 数据库在线应用写入数据库时,填充modify字段为更改时间戳,包括新增、更新、删除(逻辑删)。对于这类应用,DrdsReader只需要WHERE条件跟上一同步阶段时间戳即可。
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* 对于新增流水型数据,DrdsReader可以WHERE条件后跟上一阶段最大自增ID即可。
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对于业务上无字段区分新增、修改数据情况,DrdsReader也无法进行增量数据同步,只能同步全量数据。
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### 5.4 Sql安全性
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DrdsReader提供querySql语句交给用户自己实现SELECT抽取语句,DrdsReader本身对querySql不做任何安全性校验。这块交由DataX用户方自己保证。
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## 6 FAQ
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***
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**Q: DrdsReader同步报错,报错信息为XXX**
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A: 网络或者权限问题,请使用DRDS命令行测试:
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mysql -u<username> -p<password> -h<ip> -D<database> -e "select * from <表名>"
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如果上述命令也报错,那可以证实是环境问题,请联系你的DBA。
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***
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**Q: 我想同步DRDS增量数据,怎么配置?**
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A: DrdsReader必须业务支持增量字段DataX才能同步增量,例如在淘宝大部分业务表中,通过gmt_modified字段表征这条记录的最新修改时间,那么DataX DrdsReader只需要配置where条件为
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```
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"where": "Date(add_time) = '2014-06-01'"
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```
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***
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Executable
+84
@@ -0,0 +1,84 @@
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<?xml version="1.0" encoding="UTF-8"?>
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||||
<project xmlns="http://maven.apache.org/POM/4.0.0"
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||||
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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||||
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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||||
<modelVersion>4.0.0</modelVersion>
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||||
<parent>
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||||
<groupId>com.alibaba.datax</groupId>
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||||
<artifactId>datax-all</artifactId>
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||||
<version>0.0.1-SNAPSHOT</version>
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||||
</parent>
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||||
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||||
<artifactId>drdsreader</artifactId>
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||||
<name>drdsreader</name>
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||||
<packaging>jar</packaging>
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||||
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||||
<dependencies>
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||||
<dependency>
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||||
<groupId>com.alibaba.datax</groupId>
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||||
<artifactId>datax-common</artifactId>
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||||
<version>${datax-project-version}</version>
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||||
<exclusions>
|
||||
<exclusion>
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||||
<artifactId>slf4j-log4j12</artifactId>
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||||
<groupId>org.slf4j</groupId>
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||||
</exclusion>
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||||
</exclusions>
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||||
</dependency>
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||||
<dependency>
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||||
<groupId>org.slf4j</groupId>
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||||
<artifactId>slf4j-api</artifactId>
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||||
</dependency>
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||||
<dependency>
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||||
<groupId>ch.qos.logback</groupId>
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||||
<artifactId>logback-classic</artifactId>
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||||
</dependency>
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||||
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||||
<dependency>
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||||
<groupId>com.alibaba.datax</groupId>
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||||
<artifactId>plugin-rdbms-util</artifactId>
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||||
<version>${datax-project-version}</version>
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||||
</dependency>
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||||
<dependency>
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||||
<groupId>mysql</groupId>
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||||
<artifactId>mysql-connector-java</artifactId>
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||||
<version>5.1.34</version>
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||||
</dependency>
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||||
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||||
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||||
</dependencies>
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||||
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||||
<build>
|
||||
<plugins>
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||||
<!-- compiler plugin -->
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||||
<plugin>
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||||
<artifactId>maven-compiler-plugin</artifactId>
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||||
<configuration>
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||||
<source>1.6</source>
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||||
<target>1.6</target>
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||||
<encoding>${project-sourceEncoding}</encoding>
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||||
</configuration>
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||||
</plugin>
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||||
<!-- assembly plugin -->
|
||||
<plugin>
|
||||
<artifactId>maven-assembly-plugin</artifactId>
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||||
<configuration>
|
||||
<descriptors>
|
||||
<descriptor>src/main/assembly/package.xml</descriptor>
|
||||
</descriptors>
|
||||
<finalName>datax</finalName>
|
||||
</configuration>
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||||
<executions>
|
||||
<execution>
|
||||
<id>dwzip</id>
|
||||
<phase>package</phase>
|
||||
<goals>
|
||||
<goal>single</goal>
|
||||
</goals>
|
||||
</execution>
|
||||
</executions>
|
||||
</plugin>
|
||||
</plugins>
|
||||
</build>
|
||||
|
||||
</project>
|
||||
Executable
+35
@@ -0,0 +1,35 @@
|
||||
<assembly
|
||||
xmlns="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.0"
|
||||
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
|
||||
xsi:schemaLocation="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.0 http://maven.apache.org/xsd/assembly-1.1.0.xsd">
|
||||
<id></id>
|
||||
<formats>
|
||||
<format>dir</format>
|
||||
</formats>
|
||||
<includeBaseDirectory>false</includeBaseDirectory>
|
||||
<fileSets>
|
||||
<fileSet>
|
||||
<directory>src/main/resources</directory>
|
||||
<includes>
|
||||
<include>plugin.json</include>
|
||||
<include>plugin_job_template.json</include>
|
||||
</includes>
|
||||
<outputDirectory>plugin/reader/drdsreader</outputDirectory>
|
||||
</fileSet>
|
||||
<fileSet>
|
||||
<directory>target/</directory>
|
||||
<includes>
|
||||
<include>drdsreader-0.0.1-SNAPSHOT.jar</include>
|
||||
</includes>
|
||||
<outputDirectory>plugin/reader/drdsreader</outputDirectory>
|
||||
</fileSet>
|
||||
</fileSets>
|
||||
|
||||
<dependencySets>
|
||||
<dependencySet>
|
||||
<useProjectArtifact>false</useProjectArtifact>
|
||||
<outputDirectory>plugin/reader/drdsreader/libs</outputDirectory>
|
||||
<scope>runtime</scope>
|
||||
</dependencySet>
|
||||
</dependencySets>
|
||||
</assembly>
|
||||
+150
@@ -0,0 +1,150 @@
|
||||
package com.alibaba.datax.plugin.reader.drdsreader;
|
||||
|
||||
import com.alibaba.datax.common.exception.DataXException;
|
||||
import com.alibaba.datax.common.plugin.RecordSender;
|
||||
import com.alibaba.datax.common.spi.Reader;
|
||||
import com.alibaba.datax.common.util.Configuration;
|
||||
import com.alibaba.datax.plugin.rdbms.reader.CommonRdbmsReader;
|
||||
import com.alibaba.datax.plugin.rdbms.reader.Constant;
|
||||
import com.alibaba.datax.plugin.rdbms.reader.Key;
|
||||
import com.alibaba.datax.plugin.rdbms.util.DBUtilErrorCode;
|
||||
import com.alibaba.datax.plugin.rdbms.util.DataBaseType;
|
||||
import com.alibaba.datax.plugin.rdbms.util.TableExpandUtil;
|
||||
import org.slf4j.Logger;
|
||||
import org.slf4j.LoggerFactory;
|
||||
|
||||
import java.util.List;
|
||||
|
||||
public class DrdsReader extends Reader {
|
||||
|
||||
private static final DataBaseType DATABASE_TYPE = DataBaseType.MySql;
|
||||
private static final Logger LOG = LoggerFactory.getLogger(DrdsReader.class);
|
||||
|
||||
public static class Job extends Reader.Job {
|
||||
|
||||
private Configuration originalConfig = null;
|
||||
private CommonRdbmsReader.Job commonRdbmsReaderJob;
|
||||
|
||||
@Override
|
||||
public void init() {
|
||||
this.originalConfig = super.getPluginJobConf();
|
||||
int fetchSize = this.originalConfig.getInt(Constant.FETCH_SIZE,
|
||||
Integer.MIN_VALUE);
|
||||
this.originalConfig.set(Constant.FETCH_SIZE, fetchSize);
|
||||
this.validateConfiguration();
|
||||
|
||||
this.commonRdbmsReaderJob = new CommonRdbmsReader.Job(
|
||||
DATABASE_TYPE);
|
||||
this.commonRdbmsReaderJob.init(this.originalConfig);
|
||||
}
|
||||
|
||||
@Override
|
||||
public List<Configuration> split(int adviceNumber) {
|
||||
return DrdsReaderSplitUtil.doSplit(this.originalConfig,
|
||||
adviceNumber);
|
||||
}
|
||||
|
||||
@Override
|
||||
public void post() {
|
||||
this.commonRdbmsReaderJob.post(this.originalConfig);
|
||||
}
|
||||
|
||||
@Override
|
||||
public void destroy() {
|
||||
this.commonRdbmsReaderJob.destroy(this.originalConfig);
|
||||
}
|
||||
|
||||
private void validateConfiguration() {
|
||||
// do not splitPk
|
||||
String splitPk = originalConfig.getString(Key.SPLIT_PK, null);
|
||||
if (null != splitPk) {
|
||||
LOG.warn("由于您读取数据库是drds, 所以您不需要配置 splitPk. 如果您不想看到这条提醒,请移除您源头表中配置的 splitPk.");
|
||||
this.originalConfig.remove(Key.SPLIT_PK);
|
||||
}
|
||||
|
||||
List<Object> conns = this.originalConfig.getList(
|
||||
Constant.CONN_MARK, Object.class);
|
||||
if (null == conns || conns.size() != 1) {
|
||||
throw DataXException.asDataXException(
|
||||
DBUtilErrorCode.REQUIRED_VALUE,
|
||||
"您未配置读取数据库jdbcUrl的信息. 正确的配置方式是给 jdbcUrl 配置上您需要读取的连接. 请检查您的配置并作出修改.");
|
||||
}
|
||||
Configuration connConf = Configuration
|
||||
.from(conns.get(0).toString());
|
||||
connConf.getNecessaryValue(Key.JDBC_URL,
|
||||
DBUtilErrorCode.REQUIRED_VALUE);
|
||||
|
||||
// only one jdbcUrl
|
||||
List<String> jdbcUrls = connConf
|
||||
.getList(Key.JDBC_URL, String.class);
|
||||
if (null == jdbcUrls || jdbcUrls.size() != 1) {
|
||||
throw DataXException.asDataXException(
|
||||
DBUtilErrorCode.ILLEGAL_VALUE,
|
||||
"您的jdbcUrl配置信息有误, 因为您配置读取数据库jdbcUrl的数量不正确. 正确的配置方式是配置且只配置 1 个目的 jdbcUrl. 请检查您的配置并作出修改.");
|
||||
}
|
||||
// if have table,only one
|
||||
List<String> tables = connConf.getList(Key.TABLE, String.class);
|
||||
if (null != tables && tables.size() != 1) {
|
||||
throw DataXException
|
||||
.asDataXException(DBUtilErrorCode.ILLEGAL_VALUE,
|
||||
"您的jdbcUrl配置信息有误. 由于您读取数据库是drds,配置读取源表数目错误. 正确的配置方式是配置且只配置 1 个目的 table. 请检查您的配置并作出修改.");
|
||||
|
||||
}
|
||||
if (null != tables && tables.size() == 1) {
|
||||
List<String> expandedTables = TableExpandUtil.expandTableConf(
|
||||
DATABASE_TYPE, tables);
|
||||
if (null == expandedTables || expandedTables.size() != 1) {
|
||||
throw DataXException
|
||||
.asDataXException(DBUtilErrorCode.ILLEGAL_VALUE,
|
||||
"您的jdbcUrl配置信息有误. 由于您读取数据库是drds,配置读取源表数目错误. 正确的配置方式是配置且只配置 1 个目的 table. 请检查您的配置并作出修改.");
|
||||
}
|
||||
}
|
||||
|
||||
// if have querySql,only one
|
||||
List<String> querySqls = connConf.getList(Key.QUERY_SQL,
|
||||
String.class);
|
||||
if (null != querySqls && querySqls.size() != 1) {
|
||||
throw DataXException
|
||||
.asDataXException(DBUtilErrorCode.ILLEGAL_VALUE,
|
||||
"您的querySql配置信息有误. 由于您读取数据库是drds, 配置读取querySql数目错误. 正确的配置方式是配置且只配置 1 个 querySql. 请检查您的配置并作出修改.");
|
||||
}
|
||||
|
||||
// warn:other checking about table,querySql in common
|
||||
}
|
||||
}
|
||||
|
||||
public static class Task extends Reader.Task {
|
||||
|
||||
private Configuration readerSliceConfig;
|
||||
private CommonRdbmsReader.Task commonRdbmsReaderTask;
|
||||
|
||||
@Override
|
||||
public void init() {
|
||||
this.readerSliceConfig = super.getPluginJobConf();
|
||||
this.commonRdbmsReaderTask = new CommonRdbmsReader.Task(
|
||||
DATABASE_TYPE,super.getTaskGroupId(), super.getTaskId());
|
||||
this.commonRdbmsReaderTask.init(this.readerSliceConfig);
|
||||
|
||||
}
|
||||
|
||||
@Override
|
||||
public void startRead(RecordSender recordSender) {
|
||||
int fetchSize = this.readerSliceConfig.getInt(Constant.FETCH_SIZE);
|
||||
|
||||
this.commonRdbmsReaderTask.startRead(this.readerSliceConfig,
|
||||
recordSender, super.getTaskPluginCollector(), fetchSize);
|
||||
}
|
||||
|
||||
@Override
|
||||
public void post() {
|
||||
this.commonRdbmsReaderTask.post(this.readerSliceConfig);
|
||||
}
|
||||
|
||||
@Override
|
||||
public void destroy() {
|
||||
this.commonRdbmsReaderTask.destroy(this.readerSliceConfig);
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
}
|
||||
Executable
+31
@@ -0,0 +1,31 @@
|
||||
package com.alibaba.datax.plugin.reader.drdsreader;
|
||||
|
||||
import com.alibaba.datax.common.spi.ErrorCode;
|
||||
|
||||
public enum DrdsReaderErrorCode implements ErrorCode {
|
||||
GET_TOPOLOGY_FAILED("DrdsReader-01", "获取 drds 表的拓扑结构失败."),;
|
||||
|
||||
private final String code;
|
||||
private final String description;
|
||||
|
||||
private DrdsReaderErrorCode(String code, String description) {
|
||||
this.code = code;
|
||||
this.description = description;
|
||||
}
|
||||
|
||||
@Override
|
||||
public String getCode() {
|
||||
return this.code;
|
||||
}
|
||||
|
||||
@Override
|
||||
public String getDescription() {
|
||||
return this.description;
|
||||
}
|
||||
|
||||
@Override
|
||||
public String toString() {
|
||||
return String.format("Code:[%s], Description:[%s]. ", this.code,
|
||||
this.description);
|
||||
}
|
||||
}
|
||||
Executable
+121
@@ -0,0 +1,121 @@
|
||||
package com.alibaba.datax.plugin.reader.drdsreader;
|
||||
|
||||
import com.alibaba.datax.common.exception.DataXException;
|
||||
import com.alibaba.datax.common.util.Configuration;
|
||||
import com.alibaba.datax.plugin.rdbms.reader.Constant;
|
||||
import com.alibaba.datax.plugin.rdbms.reader.Key;
|
||||
import com.alibaba.datax.plugin.rdbms.reader.util.SingleTableSplitUtil;
|
||||
import com.alibaba.datax.plugin.rdbms.util.DBUtil;
|
||||
import com.alibaba.datax.plugin.rdbms.util.DBUtilErrorCode;
|
||||
import com.alibaba.datax.plugin.rdbms.util.DataBaseType;
|
||||
import org.slf4j.Logger;
|
||||
import org.slf4j.LoggerFactory;
|
||||
|
||||
import java.sql.Connection;
|
||||
import java.sql.ResultSet;
|
||||
import java.util.*;
|
||||
|
||||
public class DrdsReaderSplitUtil {
|
||||
|
||||
private static final Logger LOG = LoggerFactory
|
||||
.getLogger(DrdsReaderSplitUtil.class);
|
||||
|
||||
public static List<Configuration> doSplit(Configuration originalSliceConfig,
|
||||
int adviceNumber) {
|
||||
boolean isTableMode = originalSliceConfig.getBool(Constant.IS_TABLE_MODE).booleanValue();
|
||||
int tableNumber = originalSliceConfig.getInt(Constant.TABLE_NUMBER_MARK);
|
||||
|
||||
if (isTableMode && tableNumber == 1) {
|
||||
//需要先把内层的 table,connection 先放到外层
|
||||
String table = originalSliceConfig.getString(String.format("%s[0].%s[0]", Constant.CONN_MARK, Key.TABLE)).trim();
|
||||
originalSliceConfig.set(Key.TABLE, table);
|
||||
|
||||
//注意:这里的 jdbcUrl 不是从数组中获取的,因为之前的 master init 方法已经进行过预处理
|
||||
String jdbcUrl = originalSliceConfig.getString(String.format("%s[0].%s", Constant.CONN_MARK, Key.JDBC_URL)).trim();
|
||||
|
||||
originalSliceConfig.set(Key.JDBC_URL, DataBaseType.DRDS.appendJDBCSuffixForReader(jdbcUrl));
|
||||
|
||||
originalSliceConfig.remove(Constant.CONN_MARK);
|
||||
return doDrdsReaderSplit(originalSliceConfig);
|
||||
} else {
|
||||
throw DataXException.asDataXException(DBUtilErrorCode.CONF_ERROR, "您的配置信息中的表(table)的配置有误. 因为Drdsreader 只需要读取一张逻辑表,后台会通过DRDS Proxy自动获取实际对应物理表的数据. 请检查您的配置并作出修改.");
|
||||
}
|
||||
}
|
||||
|
||||
private static List<Configuration> doDrdsReaderSplit(Configuration originalSliceConfig) {
|
||||
List<Configuration> splittedConfigurations = new ArrayList<Configuration>();
|
||||
|
||||
Map<String, List<String>> topology = getTopology(originalSliceConfig);
|
||||
if (null == topology || topology.isEmpty()) {
|
||||
throw DataXException.asDataXException(DrdsReaderErrorCode.GET_TOPOLOGY_FAILED,
|
||||
"获取 drds 表拓扑结构失败, 拓扑结构不能为空.");
|
||||
} else {
|
||||
String table = originalSliceConfig.getString(Key.TABLE).trim();
|
||||
String column = originalSliceConfig.getString(Key.COLUMN).trim();
|
||||
String where = originalSliceConfig.getString(Key.WHERE, null);
|
||||
// 不能带英语分号结尾
|
||||
String sql = SingleTableSplitUtil
|
||||
.buildQuerySql(column, table, where);
|
||||
// 根据拓扑拆分任务
|
||||
for (Map.Entry<String, List<String>> entry : topology.entrySet()) {
|
||||
String group = entry.getKey();
|
||||
StringBuilder sqlbuilder = new StringBuilder();
|
||||
sqlbuilder.append("/*+TDDL({'extra':{'MERGE_UNION':'false'},'type':'direct',");
|
||||
sqlbuilder.append("'vtab':'").append(table).append("',");
|
||||
sqlbuilder.append("'dbid':'").append(group).append("',");
|
||||
sqlbuilder.append("'realtabs':[");
|
||||
Iterator<String> it = entry.getValue().iterator();
|
||||
while (it.hasNext()) {
|
||||
String realTable = it.next();
|
||||
sqlbuilder.append('\'').append(realTable).append('\'');
|
||||
if (it.hasNext()) {
|
||||
sqlbuilder.append(',');
|
||||
}
|
||||
}
|
||||
sqlbuilder.append("]})*/");
|
||||
sqlbuilder.append(sql);
|
||||
Configuration param = originalSliceConfig.clone();
|
||||
param.set(Key.QUERY_SQL, sqlbuilder.toString());
|
||||
splittedConfigurations.add(param);
|
||||
}
|
||||
|
||||
return splittedConfigurations;
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
private static Map<String, List<String>> getTopology(Configuration configuration) {
|
||||
Map<String, List<String>> topology = new HashMap<String, List<String>>();
|
||||
|
||||
String jdbcURL = configuration.getString(Key.JDBC_URL);
|
||||
String username = configuration.getString(Key.USERNAME);
|
||||
String password = configuration.getString(Key.PASSWORD);
|
||||
String logicTable = configuration.getString(Key.TABLE).trim();
|
||||
|
||||
Connection conn = null;
|
||||
ResultSet rs = null;
|
||||
try {
|
||||
conn = DBUtil.getConnection(DataBaseType.DRDS, jdbcURL, username, password);
|
||||
rs = DBUtil.query(conn, "SHOW TOPOLOGY " + logicTable);
|
||||
while (DBUtil.asyncResultSetNext(rs)) {
|
||||
String groupName = rs.getString("GROUP_NAME");
|
||||
String tableName = rs.getString("TABLE_NAME");
|
||||
List<String> tables = topology.get(groupName);
|
||||
if (tables == null) {
|
||||
tables = new ArrayList<String>();
|
||||
topology.put(groupName, tables);
|
||||
}
|
||||
tables.add(tableName);
|
||||
}
|
||||
|
||||
return topology;
|
||||
} catch (Exception e) {
|
||||
throw DataXException.asDataXException(DrdsReaderErrorCode.GET_TOPOLOGY_FAILED,
|
||||
String.format("获取 drds 表拓扑结构失败.根据您的配置, datax获取不到拓扑信息。相关上下文信息:表:%s, jdbcUrl:%s . 请联系 drds 管理员处理.", logicTable, jdbcURL), e);
|
||||
} finally {
|
||||
DBUtil.closeDBResources(rs, null, conn);
|
||||
}
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
Executable
+6
@@ -0,0 +1,6 @@
|
||||
{
|
||||
"name": "drdsreader",
|
||||
"class": "com.alibaba.datax.plugin.reader.drdsreader.DrdsReader",
|
||||
"description": "useScene: prod. mechanism: Jdbc connection using the database, execute select sql, retrieve data from the ResultSet. warn: The more you know about the database, the less problems you encounter.",
|
||||
"developer": "alibaba"
|
||||
}
|
||||
@@ -0,0 +1,11 @@
|
||||
{
|
||||
"name": "drdsreader",
|
||||
"parameter": {
|
||||
"jdbcUrl": "",
|
||||
"username": "",
|
||||
"password": "",
|
||||
"table": "",
|
||||
"column": [],
|
||||
"where": ""
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user