BYOK migration - Active/Passive Region with CRR Enabled - Best Practices

Question

Currently we have Failover Routing Policy configured in Route53.  We have S3 replication enabled and DynamoDB global tables as well. 
If we are performing BYOK migration in Primary region and allow customer traffic only to Secondary region, if records are created in S3 and DynamoDB global tables, these will be replicated to Primary region as well.  Will it create any issues in Primary region S3 and DynamoDB tables when migration is going on? Could you please share any other recommendations or best practices for such a migration in active-passive environments.

Answer

First, S3 bucket cross region replication is one-way which from source bucket to the target bucket only. If you want to switch the data I/O to the replica bucket during the migration process, you  should adjust the path of the target bucket.
Secondly, the DynamoDB global table is in active/active mode and also a fully managed service. Data written in any region will be asynchronized to other regions, and users do not  consider his synchronization mechanism and issues.
Thirdly, during the migration, if all the data is written to the primary region, there is basically no major risk, but the customer needs to choose a relatively idle time for operation, takes sufficient POC testing ,Prepares data protection and plan B.
Finally, provide an blog about of dynamoDB global table , hoping to help you better understand this service.

https://aws.amazon.com/blogs/database/how-to-use-amazon-dynamodb-global-tables-to-power-multiregion-architectures/

BYOK migration - Active/Passive Region with CRR Enabled - Best Practices

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