Checking Details
It is recommended that the source database be a replica node. Otherwise, the check item will generate an alarm. The alarm will not block the task, and you can ignore the alarm to proceed with the task, but you need to evaluate the impact of doing so.
During migration, DTS performs a bgsave operation on the source database, consuming its memory and resources. When the source database is a master node, service write operations are significantly impacted.
If the source database is a Tencent Cloud Distributed Cache database, a replica node will be used for migration by default.
Fix
It is recommended to reconfigure the migration task and configure the source database parameters as the replica node information.