RDS Blue/Green deployment on a very large Database seems too long

Question

Hello, 
We are trying to use the new `RDS Blue/Green Deployments` feature to upgrade Aurora Mysql 5.6 to 5.7. We did some tests on a small DB (a few GiB) and everything worked fine. 
So we tried running a Blue/Green on a 3.6 TiB Database (with billions of rows), but it seems RDS can't create the Green instance, it's been on status `Provisioning` for 6 days now and we can't find any progress information, we guess things are "blocked".

Should we wait longer ? Is there any limitation on the DB size to use Blue/Green deployment ?

Answer

It appears that you may have either deleted or revoked permissions to the KMS key for this cluster which is blocking the provisioning of the Blue Green Deployment. 
You might open a support case with AWS support to work through this error.
thanks,

RDS Blue/Green deployment on a very large Database seems too long

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