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使用手册

环境要求

纯 JAVA 开发,JDK 建议 1.8 以上版本。

支持迁移场景如下:

源端 目标端 是否支持
MySQL(5.1.15 ~ 5.7.x) ShardingSphere-Proxy
PostgreSQL(9.4 ~ ) ShardingSphere-Proxy

注意

如果后端连接 MySQL 数据库,请下载 mysql-connector-java-5.1.47.jar,并将其放入 ${shardingsphere-scaling}\lib 目录。

权限要求

MySQL 需要开启 binlogbinlog format 为Row模式,且迁移时所使用用户需要赋予 Replication 相关权限。

+-----------------------------------------+---------------------------------------+
| Variable_name                           | Value                                 |
+-----------------------------------------+---------------------------------------+
| log_bin                                 | ON                                    |
| binlog_format                           | ROW                                   |
+-----------------------------------------+---------------------------------------+

+------------------------------------------------------------------------------+
|Grants for ${username}@${host}                                                |
+------------------------------------------------------------------------------+
|GRANT REPLICATION SLAVE, REPLICATION CLIENT ON *.* TO ${username}@${host}     |
|.......                                                                       |
+------------------------------------------------------------------------------+

PostgreSQL 需要开启 test_decoding

API接口

弹性迁移组件提供了简单的 HTTP API 接口

创建迁移任务

接口描述:POST /scaling/job/start

请求体:

参数 描述
ruleConfiguration.source 源端数据源相关配置
ruleConfiguration.target 目标端数据源相关配置
jobConfiguration.concurrency 迁移并发度,举例:如果设置为3,则待迁移的表将会有三个线程同时对该表进行迁移,前提是该表有整数型主键

数据源配置:

参数 描述
type 数据源类型(可选参数:shardingSphereJdbc、jdbc)
parameter 数据源参数

Parameter配置:

type = shardingSphereJdbc

参数 描述
dataSource 源端sharding sphere数据源相关配置
rule 源端sharding sphere表规则相关配置

type = jdbc

参数 描述
name jdbc 名称
ruleConfiguration.targetDataSources.jdbcUrl jdbc 连接
ruleConfiguration.targetDataSources.username jdbc 用户
ruleConfiguration.targetDataSources.password jdbc 密码

*** 注意 ***

当前 source type 必须是 shardingSphereJdbc

示例:

curl -X POST \
  http://localhost:8888/scaling/job/start \
  -H 'content-type: application/json' \
  -d '{
        "ruleConfiguration": {
          "source": {
            "type": "shardingSphereJdbc",
            "parameter": {
              "dataSource":"
                dataSources:
                  ds_0:
                    dataSourceClassName: com.zaxxer.hikari.HikariDataSource
                    props:
                      driverClassName: com.mysql.jdbc.Driver
                      jdbcUrl: jdbc:mysql://127.0.0.1:3306/scaling_0?useSSL=false
                      username: scaling
                      password: scaling
                  ds_1:
                    dataSourceClassName: com.zaxxer.hikari.HikariDataSource
                    props:
                      driverClassName: com.mysql.jdbc.Driver
                      jdbcUrl: jdbc:mysql://127.0.0.1:3306/scaling_1?useSSL=false
                      username: scaling
                      password: scaling
                ",
              "rule":"
                rules:
                - !SHARDING
                  tables:
                    t_order:
                      actualDataNodes: ds_$->{0..1}.t_order_$->{0..1}
                      databaseStrategy:
                        standard:
                          shardingColumn: order_id
                          shardingAlgorithmName: t_order_db_algorith
                      logicTable: t_order
                      tableStrategy:
                        standard:
                          shardingColumn: user_id
                          shardingAlgorithmName: t_order_tbl_algorith
                  shardingAlgorithms:
                    t_order_db_algorith:
                      type: INLINE
                      props:
                        algorithm-expression: ds_$->{order_id % 2}
                    t_order_tbl_algorith:
                      type: INLINE
                      props:
                        algorithm-expression: t_order_$->{user_id % 2}
                "
            }
          },
          "target": {
              "type": "jdbc",
              "parameter": {
                "username": "root",
                "password": "root",
                "jdbcUrl": "jdbc:mysql://127.0.0.1:3307/sharding_db?serverTimezone=UTC&useSSL=false"
              }
          }
        },
        "jobConfiguration":{
          "concurrency":"3"
        }
      }'

返回信息:

{
   "success": true,
   "errorCode": 0,
   "errorMsg": null,
   "model": null
}

查询迁移任务进度

接口描述:GET /scaling/job/progress/{jobId}

示例:

curl -X GET \
  http://localhost:8888/scaling/job/progress/1

返回信息:

{
   "success": true,
   "errorCode": 0,
   "errorMsg": null,
   "model": {
        "id": 1,
        "jobName": "Local Sharding Scaling Job",
        "status": "RUNNING/STOPPED"
        "syncTaskProgress": [{
            "id": "127.0.0.1-3306-test",
            "status": "PREPARING/MIGRATE_HISTORY_DATA/SYNCHRONIZE_REALTIME_DATA/STOPPING/STOPPED",
            "historySyncTaskProgress": [{
                "id": "history-test-t1#0",
                "estimatedRows": 41147,
                "syncedRows": 41147
            }, {
                "id": "history-test-t1#1",
                "estimatedRows": 42917,
                "syncedRows": 42917
            }, {
                "id": "history-test-t1#2",
                "estimatedRows": 43543,
                "syncedRows": 43543
            }, {
                "id": "history-test-t2#0",
                "estimatedRows": 39679,
                "syncedRows": 39679
            }, {
                "id": "history-test-t2#1",
                "estimatedRows": 41483,
                "syncedRows": 41483
            }, {
                "id": "history-test-t2#2",
                "estimatedRows": 42107,
                "syncedRows": 42107
            }],
            "realTimeSyncTaskProgress": {
                "id": "realtime-test",
                "delayMillisecond": 1576563771372,
                "position": {
                    "filename": "ON.000007",
                    "position": 177532875,
                    "serverId": 0
                }
            }
        }]
   }
}

查询所有迁移任务

接口描述:GET /scaling/job/list

示例:

curl -X GET \
  http://localhost:8888/scaling/job/list

返回信息:

{
  "success": true,
  "errorCode": 0,
  "model": [
    {
      "jobId": 1,
      "jobName": "Local Sharding Scaling Job",
      "status": "RUNNING"
    }
  ]
}

停止迁移任务

接口描述:GET /scaling/job/stop

请求体:

参数 描述
jobId job id

示例:

curl -X GET \
  http://localhost:8888/scaling/job/stop/1

返回信息:

{
   "success": true,
   "errorCode": 0,
   "errorMsg": null,
   "model": null
}

通过UI界面来操作

ShardingSphere-Scaling 与 ShardingSphere-UI 集成了用户界面,所以上述所有任务相关的操作都可以通过 UI 界面点点鼠标来实现,当然本质上还是调用了上述基本接口。

更多信息请参考 ShardingSphere-UI 项目。