CheckIfBDRModeIsSupported checks if the downstream supports BDR mode.

CheckIsTiDB checks if the downstream is TiDB.

GenBasicDSN generates a basic DSN from the given config.

return dsn.

GetTestDB checks and adjusts the password of the given DSN, it will return a DB instance opened with the adjusted password.

IsSinkSafeMode returns whether the sink is in safe mode.

MockTestDB creates a mock mysql database connection.

NewConfig returns the default mysql backend config.

BackoffBaseDelay indicates the base delay time for retrying.

BackoffMaxDelay indicates the max delay time for retrying.

DefaultMaxTxnRow is the default max number of rows in a transaction.

DefaultWorkerCount is the default number of workers.

MysqlWriter is responsible for writing various dml events, ddl events, syncpoint events to mysql downstream.