Why Cannot DRS Migrate Data from Third-Party Redis Such as ApsaraDB for Redis and TencentDB for Redis?

Generally, there are the following possible causes:

• Some self-developed Redis-like databases are not compatible with the PSync protocol.
• Architecture restrictions: For many cloud vendors, the proxy component is added between users and Redis. PSync is not supported due to the proxy.
• Security restrictions: In native Redis, fork() is used over PSync, which causes memory expansion, user request delay increase, and even out of memory.
• Business strategy: A large number of users use RedisShake to migrate services from the cloud or change the cloud, so PSync is shielded.

Generally, you can use a data migration service suitable for the corresponding cloud service. For details, see Overview of the Redis Data Migration Solution.