Aurora for MySQL to SelectDB

BladePipe supports data replication from Aurora for MySQL to SelectDB. View supported migration, sync, verification, and connector capabilities.

Target DataSource：

SelectDB

Connection

Basic Functions

Function	Description
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. For more information, see Create Verification and Correction DataJob.
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 Sync	ALTER TABLE ADD COLUMN, MODIFY COLUMN, RENAME COLUMN, DROP COLUMN RENAME TABLE CREATE TABLE (whole database sync).
Metadata Retrieval	Retrieve the target metadata with filtering conditions or target primary keys set from the source table.

Advanced Functions

Function	Description
Removal of Target Data before Full Data Migration	Remove the existing data in the Target before running the Full Data Migration, applicable for DataJobs reruning and scheduled Full Data migrations.
Recreating Target Table	Recreate target tables before running the Full Data Migration, applicable for DataJobs reruning and scheduled Full Data migrations.
Stream Load	Use Stream Load to write data to Doris/SelectDB BE. By default, batch write is adopted, with dynamic adjustment of data flush interval and batch size.
Handling of Zero Value for Time	Allow setting zero value for time to different data types to prevent errors when writing to the Target.
Online DDL Compatibility	Supports synchronization for GH-OST, PT-OSC, Aliyun DMS Online DDL, and PT_GHOST.
Setting Data Partitions	When creating a DataJob, specify partition definitions at the table level (static or dynamic). Automatically add these partition definitions during schema migration.
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.
Adding Virtual Columns	Support adding custom virtual columns with fixed values, such as region, ID, etc.
Setting Target Primary Key	Change the primary key to another field to facilitate data aggregation and other operations.
Data Filtering Conditions	Support data filtering using WHERE conditions, with SQL-92 as the SQL language. For more information, see Data Filtering.

Limits

Limit	Description
MySQL Storage Engine	Support InnoDB, MyISAM, AWS XEngine. Other storage engines have not been tested yet.
MySQL Character Set	Support utf8, utf8mb4, latin1. Other encodings have not been tested yet.
Target Table Type	Only support Unique key model(Unique).
Source Table Type	Migration and sync of tables without primary keys are not supported.
Data Type	Do not support binary data such as BINARY, BLOB.
Incremental Data Write Conflict Resolution Rule	Using Stream Load method, the primary key is used for full row replacement.

FAQ

How to handle MySQL DataJob latency?
What to do when binary Log cannot be found in MySQL Source?
What to do when access to schema in MySQL Source is denied?

Tip: MySQL source-related FAQ also applies to MySQL-based DataSources.
Doris/SelectDB Target Write Error

Source

Prerequisites

Prerequisite	Description
Permissions for Account	See Permissions Required for MySQL/MariaDB.
Enabling Binlog	[mysqld] log-bin=mysql-bin # Enable Binlog binlog-format=ROW # Choose ROW mode binlog_row_image=FULL # Changes include all column data

Parameters

Parameter	Description
parseBinlogParallel	Number of threads for parallel parsing of Binlog in Incremental DataJobs.
parseBinlogBufferSize	Size of the circular buffer for parsing Binlog in Incremental DataJobs.
maxTransactionSize	Maximum number of data rows per transaction. If exceeded, the transaction will be split and flushed in parts.
limitThroughputMb	Limit the throughput of incremental Binlogs.
extraDDL	Support synchronization of additional DDL, including PT, GHOST, ALI_DMS, and PT_GHOST.
needJsonEscape	Escape special characters in JSON to be written to the target database.
fullDataSqlConditionEnabled	Add filtering conditions in SQL during source data scanning. It only works in Full Data migration.
srcTimeZone	Source time zone, e.g., +08:00, Asia/Shanghai, America/New_York, etc.

Tips: To modify the general parameters, see General Parameters and Functions.

Target

Prerequisites

Prerequisite	Description
Permissions for Account	SELECT and DDL permissions (optional)
Port Preparation	Allow the migration and sync node (Worker) to connect to the Doris/SelectDB FE QueryPort and FE/BE HttpPort.

Parameters

Parameter	Description
host	MySQL port, corresponding to Doris/SelectDB FE QueryPort.
httpHost	Host for Doris stream load, corresponding to Doris/SelectDB FE/BE HttpPort.
totalDataInMemMb	Maximum data size allowed in memory when writing in batches; If the data size exceeds the memory limit, or the wait time exceeds asyncFlushIntervalSec, then data is flushed to the write queue.
asyncFlushIntervalSec	Interval to wait for flushing when writing in batches; If the wait time exceeds asyncFlushIntervalSec, or the data size exceeds totalDataInMemMb, then data is flushed to the write queue.
flushBatchMb	Maximum batch size per table; If the batch size exceeds this limit, then data is flushed to the write queue.
realFlushPauseSec	Wait time to flush data to Doris/SelectDB using stream load. 0 means no wait is needed.
soTimeoutSec	TCP socket timeout (so_timeout) during QueryPort operations.
enableTimeZoneProcess	Enable time zone conversion for time fields.
timezone	Timezone in the Target, e.g., +08:00 Asia/Shanghai America/New_York.
maxInSizePerQuery	Maximum number of IN clause values per query during secondary verification. Queries exceeding this limit will be automatically split.

Tips: To modify the general parameters, see General Parameters and Functions.