Aurora MySQL 8.0.34 - InvalidParameterCombination: Backtrack cannot currently be enabled for this cluster

Question

Using blue-green deployment, I recently upgraded from Aurora MySQL 5.7 to Aurora MySQL 8.0.34. Backtracking feature was enabled in the 5.7 cluster but apparently this setting didn't carry over to the 8.0 cluster during the BG deployment. Further, I get the following error when attempting to enable it via Terraform:

```
InvalidParameterCombination: Backtrack cannot currently be enabled for this cluster
```

Aside from a couple parameters renamed for 8.0 compatibility, the cluster and instance parameter groups used for the 8.0 cluster are identical to the ones used for the 5.7 cluster.

Any ideas what the issue could be?

Accepted Answer

Got an answer from AWS support:

>  this is due a known limitation for Blue/Green deployment, where the backtracking configuration is not set to the green cluster. Backtrack feature in not supported with Blue Green deployment and our service team is aware of this.

and

> we do not have a specific timeline for when this functionality will be generally available

Aurora MySQL 8.0.34 - InvalidParameterCombination: Backtrack cannot currently be enabled for this cluster

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