PolarDB for MySQL 到 StarRocks
| 功能 | 说明 |
|---|---|
Schema Migration | If the target schema does not exist, BladePipe will automatically generate and execute CREATE statements based on the source metadata and the mapping rule. |
Full Data Migration | Migrate data by sequentially scanning data in tables and writing it in batches to the target database. |
Incremental Data Sync | Sync of common DML like INSERT, UPDATE, DELETE is supported. |
Data Verification and Correction | Verify all existing data. Optionally, you can correct the inconsistent data based on verification results. Scheduled DataTasks are supported. |
Subscription Modification | Add, delete, or modify the subscribed tables with support for historical data migration. For more information, see Modify Subscription. |
Position Resetting | Reset positions by file position or timestamp. Allow re-consumption of incremental data logs in a past period or since a specific Binlog file and position. |
Table Name Mapping | Support the mapping rules, namely, keeping the name the same as that in Source, converting the text to lowercase, converting the text to uppercase, truncating the name by "_digit" suffix. |
DDL Synchronization |
|
Metadata Retrieval | Retrieve the target metadata with filtering conditions or target primary keys set from the source table. |
高级功能
| 功能 | 说明 |
|---|---|
全量前清空目标数据 | 运行全量任务前清除老数据，包括重跑任务、定时全量迁移都会触发此能力 |
重建目标表 | 运行全量任务前重建目标表，包括重跑任务、定时全量迁移都会触发此能力 |
Stream Load 数据写入 | 采用 Stream Load 到 StarRocks Be 写入数据, 默认攒批写入，可动态调节刷出数据节奏和批次大小 |
0 值时间处理 | 支持将 0 值时间设置成不同类型的值，防止写入对端报错 |
Custom Table Properties | Include settings for properties such as bucket count and replica count. |
When creating a DataJob, specify partition definitions at the table level (static or dynamic). Automatically add these partition definitions during schema migration. | |
Online DDL Compatibility | Support GH-OST, PT-OSC, Aliyun DMS Online DDL. |
Scheduled Full Data Migration | For more information, see Create Scheduled Full Data DataJob. |
Custom Code | For more information, see Custom Code Processing, Debug Custom Code and Logging in Custom Code. |
Data Filtering Conditions | Support data filtering using WHERE conditions, with SQL-92 as the SQL language. For more information, see Data Filtering. |
Setting Target Primary Key | Change the primary key to another field to facilitate data aggregation and other operations. |
限制和注意点
| 限制项 | 说明 |
|---|---|
对端表类型 | 仅支持 主键模型(Primary Key) |
源端表类型 | 不支持 无主键表 迁移同步 |
DDL 同步报错 |
|
增量写入冲突策略 | Stream Load 写入以主键进行整行替换 |
前置条件
| 条件 | 说明 |
|---|---|
账号权限 | 云数据库读写账号或高权限账号 |
开启 Binlog | 云数据实例详情 > 配置与管理 > 参数配置 > 设置 loose_polar_log_bin 为 true |
PolarDbMySQL 字符集 | 支持 utf8, utf8mb4, latin1, 其他编码暂未测试 |
任务参数
| 参数名称 | 说明 |
|---|---|
parseBinlogParallel | 增量解析 Binlog 的并发数 |
parseBinlogBufferSize | 用于增量解析 Binlog 的环形队列大小 |
maxTransactionSize | 单事务最大数据条数，超过则分段刷出 |
limitThroughputMb | 限制增量 Binlog 流量 |
extraDDL | 兼容额外的 DDL 同步，包括 PT, GHOST, ALI_DMS, PT_GHOST |
needJsonEscape | 将 json 中特殊字符进行转义，以写入到对端 |
Tips: 通用参数配置请参考 通用参数及功能
任务参数
| 参数名称 | 说明 |
|---|---|
host | MySQL 协议交互链接，对应 StarRocks FE QueryPort |
httpHost | StarRocks stream load 链接，对应 StarRocks FE/BE HttpPort |
totalDataInMemMb | 攒批写入，内存中最大数据容量，超过此容量或超过 asyncFlushIntervalSec 则刷出数据到写入队列 |
asyncFlushIntervalSec | 攒批写入，等待刷出的间隔时间，超过此时间或超过 totalDataInMemMb 则刷出数据到写入队列 |
flushBatchMb | 单表最大攒批容量，超过此容量则刷出数据到写入队列 |
realFlushPauseSec | 使用 stream load 刷出数据到 StarRocks 的等待时间，0 则不等待 |
soTimeoutSec | 在 QueryPort 执行操作时 tcp 超时链接 (so_timeout) |
httpSoTimeoutSec | 在 HttpPort 执行操作时 tcp 超时链接 (so_timeout) |
enableTimeZoneProcess | 是否对时间字段进行时区转换 |
timezone | 目标端 StarRocks 时区，例如 +08:00 Asia/Shanghai America/New_York |
maxInSizePerQuery | 校验任务中，对端单次查询的最大 IN 条件值数量，大于该值会自动拆分多次查询 |
Tips: 通用参数配置请参考 通用参数及功能