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You can be sure that that will come.

Probably not. Amazon has intentionally crippled external replication in MySQL for years now.

It's a form of vendor lock-in and you shouldn't support it.

Without replication it's impossible to migrate out of RDS without taking downtime (I've been through this and it was painful).

This seems to have changed:

http://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/MySQL....

This isn't true anymore. RDS now exposes an external replication stream for Mysql. AWS actually doesn't seem to be that interested in vendor lock-in. They usually build what people ask for.

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